WO1992002358A1 - Foam-molded item of olefinic synthetic resin and method of manufacturing the same - Google Patents
Foam-molded item of olefinic synthetic resin and method of manufacturing the same Download PDFInfo
- Publication number
- WO1992002358A1 WO1992002358A1 PCT/JP1991/001047 JP9101047W WO9202358A1 WO 1992002358 A1 WO1992002358 A1 WO 1992002358A1 JP 9101047 W JP9101047 W JP 9101047W WO 9202358 A1 WO9202358 A1 WO 9202358A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steam
- mold
- expanded particles
- temperature
- particles
- Prior art date
Links
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 21
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 25
- 239000002245 particle Substances 0.000 claims abstract description 155
- 238000000034 method Methods 0.000 claims abstract description 94
- 230000004927 fusion Effects 0.000 claims abstract description 24
- 238000009826 distribution Methods 0.000 claims abstract description 12
- 239000006260 foam Substances 0.000 claims description 51
- 238000010025 steaming Methods 0.000 claims description 49
- 150000001336 alkenes Chemical class 0.000 claims description 21
- 238000002844 melting Methods 0.000 claims description 21
- 230000008018 melting Effects 0.000 claims description 21
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 4
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 3
- 239000005977 Ethylene Substances 0.000 claims description 3
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 3
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 3
- 238000000113 differential scanning calorimetry Methods 0.000 claims 1
- 229910001872 inorganic gas Inorganic materials 0.000 claims 1
- 229920005672 polyolefin resin Polymers 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 52
- 230000000052 comparative effect Effects 0.000 description 20
- 238000000465 moulding Methods 0.000 description 20
- -1 polypropylene Polymers 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 229920005989 resin Polymers 0.000 description 11
- 239000011347 resin Substances 0.000 description 11
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 10
- 238000001816 cooling Methods 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 8
- 239000004698 Polyethylene Substances 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000000178 monomer Substances 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005187 foaming Methods 0.000 description 4
- 239000004088 foaming agent Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 230000005070 ripening Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 239000002609 medium Substances 0.000 description 3
- 239000005022 packaging material Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 229920006327 polystyrene foam Polymers 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- 239000012736 aqueous medium Substances 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- NMUWSGQKPAEPBA-UHFFFAOYSA-N 1,2-dibutylbenzene Chemical compound CCCCC1=CC=CC=C1CCCC NMUWSGQKPAEPBA-UHFFFAOYSA-N 0.000 description 1
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- BTOVVHWKPVSLBI-UHFFFAOYSA-N 2-methylprop-1-enylbenzene Chemical compound CC(C)=CC1=CC=CC=C1 BTOVVHWKPVSLBI-UHFFFAOYSA-N 0.000 description 1
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 101150069124 RAN1 gene Proteins 0.000 description 1
- 210000003323 beak Anatomy 0.000 description 1
- MPMBRWOOISTHJV-UHFFFAOYSA-N but-1-enylbenzene Chemical compound CCC=CC1=CC=CC=C1 MPMBRWOOISTHJV-UHFFFAOYSA-N 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 229920005676 ethylene-propylene block copolymer Polymers 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 239000013518 molded foam Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- QROGIFZRVHSFLM-UHFFFAOYSA-N prop-1-enylbenzene Chemical compound CC=CC1=CC=CC=C1 QROGIFZRVHSFLM-UHFFFAOYSA-N 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 210000000689 upper leg Anatomy 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/44—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form
- B29C44/445—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form in the form of expandable granules, particles or beads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3415—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3415—Heating or cooling
- B29C44/3426—Heating by introducing steam in the mould
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/16—Molding foamed polypropylen articles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/23—Sheet including cover or casing
- Y10T428/233—Foamed or expanded material encased
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249955—Void-containing component partially impregnated with adjacent component
- Y10T428/249958—Void-containing component is synthetic resin or natural rubbers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Definitions
- Patent application title REFINED SYNTHETIC RESIN FOAM AND METHOD FOR PRODUCING THE SAME
- the present invention relates to a foamed molded product of an olefin-based synthetic resin represented by an ethylene-based or propylene-based synthetic resin and a method for producing the same.
- synthetic foams such as polystyrene foams, polyolefin foams, and polypropylene foams represented by polyolefin foams have been known for their mild properties, chemical stability, and processing. Utilizing ease of use and light weight, it is used in various fields such as packaging materials, packaging materials, and cushioning materials.
- the methods for producing these foamed moldings are broadly classified into an extrusion molding method and an in-mold molding method using pre-expanded particles.
- polystyrene foam molded articles they can be roughly classified by taking advantage of their characteristics, such as extrusion molded articles for insulation materials in the construction materials field and in-mold foam molded articles in the cushioning and packaging materials fields.
- the manufacturing technology is also reaching the maturity.
- a pre-expanded synthetic resin particle is opened and closed and fitted together to form a cavity.
- a molding die consisting of a male mold and a mold capable of forming a shape
- steam is introduced into the mold, the pre-expanded particles are heated and fused, and then cooled to form a molded body from the mold.
- the method of taking out is used.
- the mold used in the present method has a large number of steam holes on the inside in contact with the pre-expanded particles for the purpose of introducing steam for heating and fusing the pre-expanded particles in the mold.
- the pre-expanded particles filled in the mold receive the heating of the steam introduced from the steam holes, causing the pre-expanded particles to re-expand in such a way as to fill the gaps between the particles. Then, they are fused to form a molded body.
- Japanese Patent Application Laid-Open No. 60-116642 Japanese Patent Application Laid-Open No. 60-116642
- the mold is first pre-heated, and the pre-heated pre-foamed particles are put in the hot air. And then heating and fusing by introducing steam (Japanese Patent Application Laid-Open No. 56-71212), the inside of a mold filled with pre-expanded particles is kept at a half-pressure state, A method in which steam is introduced and the pre-expanded particles are heated and fused (Japanese Patent Publication No. 59-51890).
- the technique is particularly effective in the region where the thickness of the molded article is large.
- the thickness of the in-mold expanded molded article of the olefin-based pre-expanded particles is at most about 10 Oom, and it is common for the styrene-based molded article.
- a molded body with a thickness of 500 mm has not yet been provided.
- An object of the present invention is to provide a thick molded product having a thickness exceeding 100.
- the present inventors have conducted intensive studies in view of such circumstances, and as a result, have found that the above object can be achieved by introducing a specific preheating step and a steaming step after filling the pre-kneaded foam particles in a mold.
- the present invention has been described.
- the present invention relates to an in-mold foamed molded article made of an orifice-based synthetic resin, wherein the foamed molded article has a thickness of 15 O or more. , And for producing the foamed molded body,
- the olefin-based pre-expanded particles having one or more melting points measured by a differential scanning calorimeter are filled in a mold that can be closed but cannot be sealed, and the particles in the mold are heated with steam.
- the pre-expanded particles are filled into a mold, and steam is introduced into the mold to fuse the pre-expanded particles.
- T y preheating temperature
- the olefin-based pre-expanded particles having one or more melting points as measured by a differential scanning calorimeter are filled in a mold that can be closed but cannot be sealed, and the particles of the skeleton type are expanded by heating with steam. After the particles are fused together, and the pre-expanded particles are filled in the mold, water vapor is introduced into the mold and a predetermined preheating temperature within a range where the fusion of the pre-expanded particles does not proceed.
- T v steam is introduced, steam is kept within a predetermined temperature range for a predetermined time, and steam is removed. Steam is supplied into the mold and the pre-expanded particles are heated and fused by maintaining the temperature at a temperature higher than the pre-ripening temperature, and thereafter, the inside of the mold of the olefin-based pre-expanded particles characterized by cooling and / or cooling.
- the content of the method is for producing a foamed molded article.
- FIG. 1 to 5 are schematic diagrams each showing an example of a molded body for explaining the thickness of the molded body
- FIG. 6 is an example of an apparatus used for manufacturing a large-sized foam molded body of the present invention. It is a schematic diagram.
- Examples of the olefin-based synthetic resin in the present invention include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, ethylene-vinyl monocopolymer, propylene homopolymer, and ethylene-propylene random.
- Polymer ethylene-propylene block copolymer, ethylene-butene-propylene random terpolymer, propylene-butyl chloride copolymer, propylene butene copolymer, propylene-maleic anhydride copolymer, poly (butene) 1), and other thermoplastic resins that can be used in combination with the above propylene resin, such as low-density polyethylene, straight-through low-density polyethylene, vinyl aromatic polymer, polybutene, ionomer, etc. It may be used as a mixture with a resin. Resin mixed Other available ⁇ plastic resin, for example Bulle aromatic Borima, Boributen may be mixed using a Echiren based resin Aio Nomar like.
- Examples of the mixing method in the case of mixing use include a mechanical method using a mixer such as an extruder, and a chemical method such as impregnation polymerization of the second and third components into polymer particles or pellets.
- a chemical method such as impregnation polymerization of the second and third components into polymer particles or pellets.
- the impregnation polymerization cited as an example of the chemical method for example, when a vinyl aromatic polymer is used, the monomer is copolymerized with the monomer as the third component. As little monomer as possible may be used, and the third component includes acrylonitrile, acrylate, ester methacrylate, dibutylbenzene, mono or diaryl maleate, and the like.
- bullet aromatic polymer examples include styrene, and monosubstituted styrene such as methyl-substituted styrene such as methylstyrene, ethylstyrene, and dimethylstyrene, and mono-methylstyrene.
- the olefin-based pre-expanded particles can be used with or without a bridge, but those without a bridge are economical.
- the above-mentioned synthetic resin has one or more melting points as measured by a differential scanning calorimeter S, and further includes those having two melting points.
- the large-sized foam molded article of the present invention has a thickness of 150 or more, desirably 300 or more, and more preferably 50 Omm or more.
- the foamed molded article of the present invention has a fusion rate of 50 or more, preferably 60% or more, more preferably 70% or more, and a density distribution of 10% or less. If the fusion ratio is not 50%, the strength of the molded body is insufficient, and if the density distribution exceeds 10%, the quality of the foam as impact characteristics and the like becomes uneven.
- the foam molded article of the present invention can be easily produced by the following two methods (A) and (B).
- the olefin-based pre-expanded particles having one or more melting points measured by a differential scanning calorimeter are filled in a mold that can be closed but cannot be sealed, and the particles in the mold are expanded by heating with steam.
- the pre-expanded particles are filled into a mold, and steam is introduced into the mold to prevent the fusion of the pre-expanded particles from proceeding.
- T Y the predetermined preheating temperature
- T Y the introduction of steam is stopped and left for a predetermined time for steaming, and then the steam and particles or drainage between the particles in the mold are removed. Is supplied into a mold, and the pre-kneaded foam particles are heated and fused, and then allowed to cool and cool or cool.
- range of ⁇ temperature (T Y) e C Enclosure is T ML — 3 0 'C Ty ⁇ TML + 5 * C, preferably T ML — 3 0' C ⁇ T ⁇ ⁇ TMI, more preferably T ML — 25 e C ⁇ T y ⁇ 1 ⁇ ! _ ⁇ 5
- TML is the melting point measured by a differential scanning calorimeter. However, when there are two or more melting points, it is the lowest melting point.
- the preheating temperature is lower (at T ML — 30), the effect of heat will not be sufficiently obtained, while if it is higher than (T ML + 5'C), the fusion of the pre-foamed particles will occur during preheating. As a result, it becomes difficult for water vapor during the main heating to enter the center of the compact.
- the melting point measured by a differential scanning calorimeter refers to the endothermic peak temperature under the following conditions. If the endothermic peak of the number of raft is observed, the lower temperature beak is referred to as the melting point ( TML) ).
- TML melting point
- the melting point is determined by using a conventional differential scanning calorimeter, for example, DSC-2 type manufactured by Parkin-Elmer, TAS-100 type manufactured by Rigaku Corporation, etc. For a 0 E sample, measure at a heating rate of 10 f / min.
- a needle-shaped fine temperature sensor is provided on the inner surface of one or both of the male mold and the if mold, that is, the side in contact with the pre-expanded particles.
- S There is a method of setting S.
- the position where the temperature is measured is determined by the length of the sensor, so it cannot be unconditionally specified by the thickness of the molded body, but it is usually 1 to 150 positions, preferably 3 to 1 from the inner surface of the mold.
- the temperature must be set so that the temperature inside the band can be measured, more preferably 5 nm or more, and more preferably 10 ° or more.
- the type of the sensor is not limited by the present invention, but may be a general sensor such as a thermistor. Sensors can be used.
- the measurement of the temperature of the particles in the preheating step is not limited to the above method, and various methods are possible by combining existing technologies.
- the method of supplying steam in the preheating step is not particularly limited, and a method generally used conventionally can be applied.
- Preheating does not control the temperature (or vapor pressure) of the heating medium as in the conventional method, but directly detects the object to be heated (preliminary foam particles) and the temperature at or near Z to control heating.
- the steaming step is intended to provide sufficient thermal energy to the pre-expanded particles and to heat the particles to a higher temperature without causing fusion while maintaining uniform temperature within and between the particles. It is.
- the steaming method in the method (A- ⁇ ), (a) a method in which the preliminary foaming particles in the mold are allowed to reach a preheating temperature, then the introduction of steam is stopped and the steam is left for a predetermined time, In the method of A-2), (b) after the pre-expanded particles in the mold reach the preheating temperature, steam is continuously introduced, and the steam is kept for a predetermined time within the preheating temperature range, and steamed. c) After the pre-expanded particles in the mold reach the preheating temperature, steam is kept for a specified period of time in the preheating temperature range while steam is introduced (steaming I). There is also a method of steaming while keeping it for a predetermined time (steaming!).
- the steaming time (T M ) is suitably 5 seconds ⁇ T M ⁇ 7 minutes, but in the above method (a), preferably 10 seconds ⁇ T M ⁇ 6 minutes, more preferably 20 seconds ⁇ ⁇ ⁇ 5 minutes, preferably in method (b), 5 seconds ⁇ ⁇ ⁇ ⁇ 2 minutes, more preferably 7 seconds ⁇ T «60 "
- the steaming II is performed following the steaming I, so that the time of the steaming I may be shorter than the case of the above (b).
- the method (a) is the method that uses the least amount of steam in the preheating process, but the time required for the steaming process tends to be longer.
- the steaming process is included in the preheating process, so the required time tends to be shorter, but the amount of steam used tends to be the largest. It is sufficient to select a suitable method in consideration of the balance between the amount of steam used and the molding cycle time, but the method (a) or (b) is advantageous from the viewpoint of energy saving.
- the drain removal step removes water vapor and / or drain remaining between the particles as a result of the preheating step and the steaming step so that the heated steam during the main heating easily enters the gaps of the pre-expanded particles. It is. Examples of the removing method include a depressurizing operation in the mold and an inflow and outflow of pressurized gas from one mold to the other, but the method is not particularly limited.
- the absolute pressure needs to be 400 mmHg or less, preferably 250 mmHg or less, more preferably 150 nrnHg or less.
- the operation after the main heating for heating and fusing the pre-expanded particles is not particularly limited in the present invention, and a method generally used conventionally can be used. A better effect can be obtained by measuring the temperature of the pre-expanded particles and controlling the heating temperature and the heating time.
- Heating temperature (T H ) is T ML — 1 0 0 C ⁇ TH ⁇ TML + 1 is 5 can be carried out in the range of at, preferably, TML- 7 E C ⁇ T H ⁇ T ML + 1 0 ° C, more preferably, T ML - 5! ⁇ Ding ⁇ +
- the heating time can be generally set in the range of 3 to 90 seconds. However, controlling the heating time by changing the resin temperature makes it easier to obtain the quality of the molded product and the stabilization of the process.
- a preferred example of the heating control method is as follows. After the main ripening is started and the particle temperature reaches the set main heating temperature range, the particle temperature starts to decrease even if heating is continued, and the set temperature range One method is to stop the main heating when it is outside. It is also effective to set the timing for stopping the main heating at a point, for example, 1 to 5 times lower than the peak temperature of the particle temperature during the main heating, in terms of heating efficiency, energy saving, or cycle heating. .
- the method (B) can be further divided into two methods (B-1) and (B-2):
- (A-1) and ( ⁇ 1-2) are the same as before reaching the ripening temperature (T Y ), but after reaching the preheating temperature (T Y ) E C, the introduction of steam is started. After steaming while maintaining the temperature within the specified temperature range for a specified time, the higher temperature steam is supplied into the mold to heat the pre-expanded particles without removing the water vapor and / or drain between the particles in the mold. A method of fusing and then allowing to cool and / or cool.
- the introduction of steam is continued, the steam is kept for a predetermined time within the predetermined temperature range, and the steam is introduced. Stop and hold for a predetermined time After further steaming, the pre-expanded particles are heated and fused by supplying higher steam into the mold and keeping it at a temperature higher than the preheating temperature without removing water vapor and Z or drain between particles in the mold. And then let it cool down and Z or cool down.
- the pre-expanded particles in the mold are allowed to reach the preheating temperature, and then steam is introduced, followed by steaming while maintaining the temperature within the preheating temperature range for a predetermined time.
- the steam is introduced, steam is maintained for a predetermined time within the preheating temperature range, and steam is stopped (steaming I).
- steaming there is a method of keeping steam for a predetermined time after stopping the steam and steaming further (steaming!).
- Steaming time (T M) is 5 seconds ⁇ T M ⁇ 5 minutes is appropriate, the above method Symbol (B- 1), is favored properly, 1 5 seconds ⁇ T M ⁇ 3 minutes, more preferably, 20 seconds ⁇ T M ⁇ 2 minutes, In the method of (B-2), steam in accordance with steaming I! Therefore, the time for steaming I may be shorter than in the case of (B-1) above.
- the method for producing the pre-expanded particles is not particularly limited, and a method conventionally used for styrene-based pre-expanded particles, for example, a monomer is separated into an aqueous medium in a closed container together with an auxiliary agent such as a polymerization initiator. And then polymerizing the monomer, impregnating with a volatile foaming agent during or after the polymerization, and then heating and foaming the resin particles with hot air or the like to obtain pre-expanded particles (for example, Or the method used in the production of orefin-based pre-expanded particles, for example, the beret of an orifice-based synthetic resin is mixed with an auxiliary agent in an aqueous medium in a closed container.
- a method conventionally used for styrene-based pre-expanded particles for example, a monomer is separated into an aqueous medium in a closed container together with an auxiliary agent such as a polymerization initiator. And
- Japanese Patent Publication No. Sho 56-134344 Japanese Patent Application Laid-Open No. Sho 62- A polymer particle containing a volatile foaming agent, as described in Japanese Patent Publication No. 106938, is dispersed in water in a closed container, and the pressure in the container is set to a value equal to or higher than the vapor pressure of the foaming agent. After ripening to above the softening point of the polymer while maintaining the pressure, one end below the water surface in the container is opened, and the polymer particles and water are simultaneously discharged into the lower pressure atmosphere from the container. And a method for obtaining pre-expanded particles.
- the method of forming the pre-expanded particles is not particularly limited, and a method conventionally used in an in-mold expansion molding method of an olefin or styrene resin can be used.
- a method of adding a foaming gas to pre-expanded particles and applying an internal pressure to the particles or a method disclosed in Japanese Patent Publication No. 55-7816
- the pre-expanded particles are molded without performing pretreatment of applying an internal pressure to the pre-expanded particles, as described in JP-B-53-33996.
- FIG. 6 is a schematic view showing an example of the manufacturing equipment S, (1) is a mold,
- thermometer (2) is a thermometer
- (3) is a steam supply pipe
- the steam supply pipe is provided.
- thermometer (3) is provided with an open / close valve (4).
- the temperature detected by the thermometer (2) is input, and the sequencer (5) that controls the opening and closing of the valve opens and closes according to the preset conditions. You.
- pre-expanded particles for example, olefin-based pre-expanded particles (7) such as ethylene-based pre-expanded particles
- pre-expanded particles for example, olefin-based pre-expanded particles (7) such as ethylene-based pre-expanded particles
- heated steam is supplied from the steam supply pipe (3) to the jacket of the mold (i)
- steam is introduced into the mold from the steam introduction opening, and the inside of the molding space (6) is heated.
- the conventional method is to heat and fuse the particles (7) to form a molded body.
- the particles (7) prior to the supply of the steam for the main heating, the particles (7) are preheated to a temperature at which the fusion of the particles (7) does not proceed.
- the temperature of ()) reaches the specified temperature, stop supplying steam and leave it for a specified time to steam.
- the inside of the mold is evacuated all at once using a vacuum bomb, a vacuum tank, or the like, to remove water vapor and drain between the particles (7).
- the preheated, steamed and 'drain-removed' particles are supplied with steam at a temperature corresponding to the melting point of the particles (7) for a predetermined time as main heating.
- To a predetermined temperature to heat and fuse.
- the preform is cooled according to a normal method, and the molded body is cooled by supplying a coolant such as cooling water, and then taken out of the mold.
- the particles (7) are preheated to a temperature at which the fusion of the particles (7) does not proceed in the same manner as in the method (A), and the temperature of the particles (7) is reduced. After reaching a predetermined temperature, supply of steam is turned on, and steam is kept within a predetermined temperature range for a predetermined time. Then, immediately after stopping the steam, or after leaving it for a predetermined time to further steam, the same heating, cooling, and cooling as in the method (A) above without removing the water vapor or drain between the particles (7). Take out from the mold la o
- the preheating step and the main heating step may be each further performed by a plurality of evaporators or operations, for example, in the main heating step, the method of introducing steam may be two, such as forward, reverse and Z or both sides. The above operations may be performed separately.
- Example 2 After the pre-expanded particles reach the preheating temperature, a foam molded article was obtained in the same manner as in Example 1 except that steam was continuously introduced and steam was held at 113 ° C. for 7 seconds. Was.
- a foamed molded body was obtained in the same manner as in Example 1, except that the thickness of the aluminum mold was set to 150, the steaming time was set to 30 seconds, and the main heating time was set to 5 seconds.
- a foam molded article was obtained in the same manner as in Example 1 except that the thickness of the aluminum mold was set to 300 thighs, the steaming time was set to 40 seconds, and the main heating time was set to 7 seconds.
- Example 2 The same method as in Example 1 was adopted except that the thickness of the aluminum mold was set to 80 O BID, the preheating temperature was set to 114, C, the steaming time was set to 120 seconds, and the main heating was set to 15 seconds. A foam molded article was obtained.
- Comparative Example 1 A foam molded article was obtained in the same manner as in Example 1 except that the temperature in the preheating step and the temperature in the main heating step were changed.
- a foam molded article was obtained in the same manner as in Example 1 except that the steaming step was not performed.
- Example 1 Except that the preheating temperature was changed and the steaming step was not performed, the same method as in Example 1 was carried out to obtain a kishi-foam compact.
- Example 1 The preheated temperature was changed, and the steaming step was not performed, except that a mashed foam was obtained in the same manner as in Example 1.
- Example I Example 2
- Example 3 Example 4
- Example 5 Comparative example 1 Comparative example 2 Comparative example 3 Comparative example ⁇ Polyethylene ethylene ethylene ethylene ethylene ethylene polyethylene polyethylene ethylene polyethylene polyethylene; / 5 0 0 u 5 0 0 nm 5 0 0 ran 1 5 0 ma 3 0 0 ⁇ 8 0 0 nil 5 0 0 us 5 0 0 us 5 0 0 am 5 0 0 m Condition A-1 (a) A- 2 (C) A- 2 (b) A- 1 (a) A-1 (a) A- 1 (a)
- a foam molded article was obtained in the same manner as in Example 7, except that the thickness of the aluminum mold was 15 O mm, the steaming time was 10 seconds, and the main heating time was 10 seconds.
- a foam molded body was obtained in the same manner as in Example 8, except that the thickness of the aluminum mold was 30 Omni, the time for steaming I was 15 seconds, and the time for steaming I was 5 seconds.
- a foam molded article was obtained in the same manner as in Example 7, except that the temperatures in the preheating step and the main heating step were changed.
- a foam molded article was obtained in the same manner as in Example 7, except that the steaming time was not performed.
- Example above To 10 and Comparative Examples 6 to 7 Immediately after molding, the appearance, fusion rate, dimensional stability, density distribution and quality of the molded body, as well as a comprehensive evaluation were performed. The results are shown in Table 2.
- Example 8 Example 8 Example 9 Example 10 Comparative Example 6 Comparative Example 7 Tree Polyethylene Polyethylene Liethinopolyethylene Polyethylene Polyethylene
- Fusion rate ⁇ 80% or more, ⁇ 50% or more, ⁇ less than 50%, X unfused
- pre-expanded polypropylene particles low-temperature melting point TML measured by differential scanning calorimeter TML-12.8 'C, expansion ratio-30 times
- pre-expanded particles reach pre-heat temperature of 12 O' C
- the introduction of steam was stopped and the mixture was left for 50 seconds to obtain a foamed molded article in the same manner as in Example 1.
- a foam molded article was obtained in the same manner as in Example 11 except that the pre-expanded particles were allowed to reach a preheating temperature of 117 ° C., and steam was introduced and steam was held for 17 seconds.
- Example 11 A foam molded article was obtained in the same manner as in Example 11 except that the pre-expanded particles were allowed to reach a preheating temperature of 117 ° C., and steam was introduced and steam was held for 17 seconds.
- a foam molded article was obtained in the same manner as in Example 11 except that the temperature and the steaming time in the preheating step were changed.
- a foam molded article was obtained in the same manner as in Example 11 except that the steaming step was not performed.
- Example 11 Example 1
- Example 12 Example 13 Comparative Example 8
- Comparative Example 9 Resin Rib ⁇ -bilene bolite nt'Len lip 11-bilene rib nt'Len f-rib at'Len
- Molded body thickness 500 mm 0 500 ran 5 0 0 nun 5 Q 0 mm 500 0 no Condition A- 1 (a) A-2 (c) A-2 (b)
- the polyolefin-based synthetic resin foam molded article of the present invention can be manufactured for the first time by providing a specific preheating step and a steaming step, and further by providing a drain removal step in these two steps. is there.
- the heat is supplied by steam, and the temperature of the pre-expanded particles and the temperature at or near the pre-expanded particles are directly measured and maintained within a predetermined preheating temperature range.
- the control is more accurate and easier than the control method.
- the heat energy of the steam as the heat medium is effectively used, and the resin temperature is made uniform between the inside and the surface of the resin to make the temperature uniform.
- the drain removal step aims to increase the efficiency of steam supply during the main heating.
- the present invention provides a large-sized resin-based foam molded article having a thickness of 500 mm or more, and its usefulness is extremely large.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69123343T DE69123343T2 (de) | 1990-08-06 | 1991-08-06 | Schaum-formkörper aus olefinischem kunstharz und verfahren zu dessen herstellung |
EP91913820A EP0495125B1 (en) | 1990-08-06 | 1991-08-06 | Foam-molded item of olefinic synthetic resin and method of manufacturing the same |
US07/842,170 US5372764A (en) | 1990-08-06 | 1991-08-06 | Method of making olefin synthetic resin expansion molded articles |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20882090 | 1990-08-06 | ||
JP2/208821 | 1990-08-06 | ||
JP20882190 | 1990-08-06 | ||
JP2/208820 | 1990-08-06 | ||
JP30483090 | 1990-11-09 | ||
JP2/304830 | 1990-11-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992002358A1 true WO1992002358A1 (en) | 1992-02-20 |
Family
ID=27328934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1991/001047 WO1992002358A1 (en) | 1990-08-06 | 1991-08-06 | Foam-molded item of olefinic synthetic resin and method of manufacturing the same |
Country Status (5)
Country | Link |
---|---|
US (2) | US5372764A (ja) |
EP (1) | EP0495125B1 (ja) |
JP (1) | JP3146004B2 (ja) |
DE (1) | DE69123343T2 (ja) |
WO (1) | WO1992002358A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999051415A1 (fr) * | 1998-03-31 | 1999-10-14 | Daisen Industry Co., Ltd. | Procede de charge de materiau en perles, procede de moulage de resines expansees y recourant, et produit expanse moule resultant |
JP2005240025A (ja) * | 2004-01-28 | 2005-09-08 | Jsp Corp | 肉厚発泡成形体およびその製造方法 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017205830B4 (de) * | 2017-04-05 | 2020-09-24 | Adidas Ag | Verfahren für die Nachbehandlung einer Vielzahl einzelner expandierter Partikel für die Herstellung mindestens eines Teils eines gegossenen Sportartikels, Sportartikel und Sportschuh |
IT202000000175A1 (it) * | 2020-01-08 | 2021-07-08 | Persico Spa | Processo di stampaggio e relativa macchina di stampaggio |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4985158A (ja) * | 1972-12-19 | 1974-08-15 | ||
JPS51101072A (ja) * | 1975-03-03 | 1976-09-07 | Asahi Dow Ltd | |
JPS5628835A (en) * | 1979-05-31 | 1981-03-23 | Civag Ag | Method of molding foaming thermoplastic resin and device using said method |
JPS57174223A (en) * | 1981-04-21 | 1982-10-26 | Daisen Kogyo:Kk | Foam molding method for synthetic resin |
Family Cites Families (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2965585A (en) * | 1958-01-20 | 1960-12-20 | Phillips Petroleum Co | Preparation of porous polymer structures |
BE623454A (ja) * | 1960-02-05 | |||
US3159693A (en) * | 1961-12-01 | 1964-12-01 | Owens Illinois Glass Co | Method of forming plastic articles |
US3992501A (en) * | 1973-06-20 | 1976-11-16 | Basf Aktiengesellschaft | Process for the manufacture of void-free polyolefin foam moldings |
JPS5122951A (ja) * | 1974-08-16 | 1976-02-24 | Yoshio Ihara | Eaaenjin |
JPS5333996A (en) * | 1976-09-10 | 1978-03-30 | Central Glass Co Ltd | Production of ultrafine grains of silica |
JPS557816A (en) * | 1978-06-30 | 1980-01-21 | Nippon Oils & Fats Co Ltd | Vegitable oil purification |
JPS561344A (en) * | 1979-06-18 | 1981-01-09 | Nishimu Denshi Kogyo Kk | Controlling method for optimum wet-quantity in wet-type insulator stain measurement |
JPS5677122A (en) * | 1979-11-29 | 1981-06-25 | Sekisui Plastics Co Ltd | Production of foamed molding made of thermoplastic resin |
JPS5712035A (en) * | 1980-06-25 | 1982-01-21 | Japan Styrene Paper Co Ltd | Production of polyolefin resin molded foam |
AU559244B2 (en) * | 1982-05-13 | 1987-03-05 | Kanegafuchi Kagaku Kogyo K.K. | Expanded polyolefin particles |
JPS5951890A (ja) * | 1982-09-20 | 1984-03-26 | 松下電器産業株式会社 | 衣類乾燥機 |
JPS6067543A (ja) * | 1983-09-21 | 1985-04-17 | Sumitomo Chem Co Ltd | 発泡成形用粒状ポリオレフィン材料 |
JPS60116432A (ja) * | 1983-11-30 | 1985-06-22 | Hitachi Chem Co Ltd | 発泡ポリスチレンの成形方法 |
JPS60189660A (ja) * | 1984-03-08 | 1985-09-27 | Japan Styrene Paper Co Ltd | 自動車バンパ−用芯材 |
JPS6145940A (ja) * | 1984-08-10 | 1986-03-06 | Yokogawa Hokushin Electric Corp | 電圧・温度測定方法 |
JPS62106938A (ja) * | 1985-11-05 | 1987-05-18 | Japan Styrene Paper Co Ltd | 改質ポリエチレン系樹脂発泡体 |
DE3541258C1 (de) * | 1985-11-22 | 1987-01-15 | Hahn Ortwin | Adaptives Steuerverfahren zum Schaeumen und Sintern von Kunststoff |
JPS62191123A (ja) * | 1986-02-18 | 1987-08-21 | Asahi Chem Ind Co Ltd | 合成樹脂発泡粒子に依る型内成形体の製造方法 |
DE3711028A1 (de) * | 1986-04-02 | 1987-11-05 | Mitsubishi Yuka Badische | Verfahren und einrichtung zur herstellung geschaeumter formkoerper |
CA1280549C (en) * | 1986-05-27 | 1991-02-19 | Kyoichi Nakamura | Pre-expanded particles of propylene resin |
JPH01500736A (ja) * | 1986-07-28 | 1989-03-16 | ザ ダウ ケミカル カンパニー | 金属鋳造に用いられる成形した気泡質プラスチック材料型の製造法 |
DE3629885C1 (de) * | 1986-09-02 | 1988-03-10 | Hahn Ortwin | Sintervorrichtung fuer thermoplastische,schaeumbare Kunststoffe |
JPH0629334B2 (ja) * | 1987-02-20 | 1994-04-20 | 鐘淵化学工業株式会社 | 直鎖低密度ポリエチレン樹脂型内発泡成形体の製造方法 |
JPH0657435B2 (ja) * | 1987-11-25 | 1994-08-03 | 鐘淵化学工業株式会社 | ポリプロピレン系樹脂の型内発泡成形法 |
JP2668384B2 (ja) * | 1988-05-12 | 1997-10-27 | 鐘淵化学工業株式会社 | 改質ポリエチレン系樹脂発泡成形体の製造方法 |
DE3902002A1 (de) * | 1989-01-24 | 1990-07-26 | Hans Erlenbach | Verfahren und vorrichtung zum herstellen von formlingen aus aufgeschaeumtem, thermoplastischem kunststoff |
US5085814A (en) * | 1989-12-21 | 1992-02-04 | Jsp Corporation | Production process of expansion-molded article |
-
1991
- 1991-08-06 US US07/842,170 patent/US5372764A/en not_active Expired - Fee Related
- 1991-08-06 EP EP91913820A patent/EP0495125B1/en not_active Expired - Lifetime
- 1991-08-06 WO PCT/JP1991/001047 patent/WO1992002358A1/ja active IP Right Grant
- 1991-08-06 DE DE69123343T patent/DE69123343T2/de not_active Expired - Fee Related
- 1991-08-06 JP JP51324991A patent/JP3146004B2/ja not_active Expired - Fee Related
-
1996
- 1996-09-30 US US08/722,935 patent/US5763023A/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4985158A (ja) * | 1972-12-19 | 1974-08-15 | ||
JPS51101072A (ja) * | 1975-03-03 | 1976-09-07 | Asahi Dow Ltd | |
JPS5628835A (en) * | 1979-05-31 | 1981-03-23 | Civag Ag | Method of molding foaming thermoplastic resin and device using said method |
JPS57174223A (en) * | 1981-04-21 | 1982-10-26 | Daisen Kogyo:Kk | Foam molding method for synthetic resin |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999051415A1 (fr) * | 1998-03-31 | 1999-10-14 | Daisen Industry Co., Ltd. | Procede de charge de materiau en perles, procede de moulage de resines expansees y recourant, et produit expanse moule resultant |
US6800227B1 (en) | 1998-03-31 | 2004-10-05 | Daisen Industry Co., Ltd. | Material bead charging method, synthetic resin mold foam forming method using this method, and mold foam formed product obtained by this method |
JP2005240025A (ja) * | 2004-01-28 | 2005-09-08 | Jsp Corp | 肉厚発泡成形体およびその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
US5372764A (en) | 1994-12-13 |
US5763023A (en) | 1998-06-09 |
DE69123343D1 (de) | 1997-01-09 |
JP3146004B2 (ja) | 2001-03-12 |
EP0495125B1 (en) | 1996-11-27 |
EP0495125A4 (en) | 1993-02-10 |
DE69123343T2 (de) | 1997-06-26 |
EP0495125A1 (en) | 1992-07-22 |
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