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WO1985000775A1 - Procede et installation de production de produits en mousse synthetique - Google Patents

Procede et installation de production de produits en mousse synthetique Download PDF

Info

Publication number
WO1985000775A1
WO1985000775A1 PCT/DK1984/000074 DK8400074W WO8500775A1 WO 1985000775 A1 WO1985000775 A1 WO 1985000775A1 DK 8400074 W DK8400074 W DK 8400074W WO 8500775 A1 WO8500775 A1 WO 8500775A1
Authority
WO
WIPO (PCT)
Prior art keywords
reagents
nozzle
mould
fed
plant
Prior art date
Application number
PCT/DK1984/000074
Other languages
English (en)
Inventor
Jens Martin Hovmo^/ller HYLDIG
Original Assignee
Hyma Engineering Aps
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hyma Engineering Aps filed Critical Hyma Engineering Aps
Publication of WO1985000775A1 publication Critical patent/WO1985000775A1/fr

Links

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
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/461—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length dispensing apparatus, e.g. dispensing foaming resin over the whole width of the moving surface

Definitions

  • the invention relates to a method for producing products of polyurethane or the like by feeding foaming reagents in one end of a mould, which may be continuously movable, and a plant for per ⁇ forming the method.
  • Polyurethane foam has many different applications and can be produced to be stiff, semi-stiff and flexible. Production thereof is by mixing and curing foaming reagents in a mould.
  • the reagents will generate a gas making the reagents foam, or a foaming gas may be added to the mixed reagents.
  • foaming the foam will expand and it gradually polymerizes and cures to a polyurethane product shaped by the mould.
  • Such products are for example used for mattresses and cushioned seats.
  • the mould may be an ordinary mould open at the top but often movable moulds are used.
  • a movable mould typically comprises a conveyor belt forming a movable bottom in the mould and a pair of oppo ⁇ sitely arranged side walls which may be fixed or movable with the bottom.
  • the sides and the bottom are lined with eg. kraft paper or polyethylene film which is drawn from rolls and is moved at the same rate as the bottom conveyor belt.
  • the moulding itself it carried out by feeding foaming reagents on the bottom of the mould, the conveying of bottom and sides preventing fresh reagents from being fed onto the previous ones. Should this happen, the finished product will get an uneven surface and an uneven density.
  • a method according to the invention can as disclosed in claim 2 be characteristic in that the reagents are fed simultaneously over the mentioned entire height so that reagents are fed over the entire height with substantially the same foaming degree.
  • the material being simultaneously fed eg. at the top and the bottom of the mould has the same foaming degree as otherwise it will not be possible to obtain a uniform product.
  • the foaming degree is highly dependent of the time passing from the moment of mixing and to the feeding of the reagents in the mould.
  • the reagents are fed through a nozzle with a sub- stantially vertical slit the length of which prefer ⁇ ably corresponds to the height of the finished product. Such feeding will ensure good control of the feeding and a uniform product.
  • the reagents are fed through a number of inlets distributed over the height of the nozzle, it is ensured that when being fed the reagents have the same foaming degree since they are not introduced into the nozzle at one end thereof and then carried through the nozzle.
  • the object of the invention is furthermore to provide a plant for a continuous production of polyurethane foam products by performing the method according to the invention, and according to the invention said plant is characteristic in that the plant comprises a feed means for foaming re- agents said means being adapted to feed the reagents into the mould over a height substantially -corre ⁇ sponding to the desired height of the finished product.
  • the foaming reagents will be fed to the mould in such a manner that the finished product will have an even and uniform surface since the reagents are not fed at the bottom of the mould.
  • the reagents will therefore not be required to expand upwards along the sides of the mould.
  • a plant according to the invention can as disclosed in claim 6 be characteristic in having a nozzle with a vertical slit the length of which substantia ⁇ lly corresponding to the desired height of the finished product.
  • Such a nozzle is simple in manu ⁇ facture and affords goods control of the feeding of the reagents.
  • - B URE OMPI may be a pipe with a cut-out slit.
  • the nozzle is connected with a number of inlets as disclosed in claim 7 thus ensuring that the reagents fed to the mould have the same foaming degree.
  • a plant which moreover comprises a mould having a part being funnel-shaped in the horizontal plane between the front section of the funnel- shaped part and the slit of the nozzle there is arranged an area where the mould has substantially parallel side walls, a further good quality of the finished product is obtained. This is probably due to the fact that the reagents obtain good adhesion to the side walls before the final expan ⁇ sion takes place.
  • Fig. 1 is a section through a plant according to the invention seen in the direction of the arrows along the line I-I in Fig. 2, and
  • Fig. 2 is a top view of a plant according to the invention.
  • OMPI Figs. 1 and 2 show a plant according to the inven ⁇ tion which plant is referred to by reference numeral 1.
  • a conveyor belt 2 By the underside of the plant 1 there is arranged a conveyor belt 2 forming a bottom in plant 1 and on which there is arranged a paper lining 3 moving along together with the conveyor belt 2 and unrolling from a roll 11.
  • the side walls of the mould itself consist of paper linings 4 engaging guides 15, 16, hinged plates 13, and parallel side plates 17, 18. The linings for the side walls are unrolled from rolls 5,6.
  • the plant comprises a nozzle 7 having a slit the height of which corresponds to the height of the moulded product 12.
  • the nozzle 7 is provided with two inlet pipes 8, 9 ending in the nozzle in such a manner that the reagents leaving the nozzle through ths slit will be more or less equally foamed.
  • the reagents are mixed in a not shown mixer and carried to the inlets 8, 9 through a central distribution pipe 10.
  • Fig. 2 shows how the mould is provided with first a short part with parallel side walls and then a V-shaped part extending in a further part with parallel side walls. The most important expansion of the materials occur in the V-shaped part of the mould where same is bounded by hinged plates 13 mounted on suspensions 14 being movable in the plane of the bottom.
  • the dashed lines in Fig. 2 show an alternative position of the plates 13.
  • the plates 13 are followed by parallel side walls
  • the hinged plates 13 and the movable suspensions 14 it is possible to change the shape of the V-shaped part in such a manner that it can be adapted to the actual moulding process and the actual product.
  • the guides 15 are also movable so that the V-shaped part may be arranged so as to begin at the slit of the nozzle 7. It is obvious to a person skilled in the art that the V-shaped part must be so long that the expansion is substantially terminated when the product leaves same. It is moreover obvious that a plant for performing the method according to the invention may be designed in many different ways when only the foaming reagents are fed in such a manner that the reagents are not to move vertically in the mould so that the inconveniences in connection with such movement are avoided.
  • the method according to the invention can of course also be performed in moulding plants where the reagents move by themselves through the mould said mould being designed with a suitable inclina- tion.
  • the part of the mould being bounded by the parallel walls 17, 18 must be so long that the finished product is suitably cured during its passage through this area.
  • the plates 13 can be sealed in relation to the bottom by means of generally known lip packings made of teflon or the like.
  • the reagents will adhere to the side paper in its full extent and the above-mentioned tension between side paper and product will be fully elimi ⁇ nated as will the risk of crack formation. Moreover, an undesired loss of gas from the reagents will substantially avoided just as the product's general skin formation consisting of more or less foamed reagents will be highly reduced.
  • the method according to the invention can be used in connection with any type of synthetic foam and not only polyurethane foam.
  • the foaming reagents can be mixed in the nozzle itself or before same in a mixer or the like thus ensuring a very homoge ⁇ founded foam.

Landscapes

  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Procédé et installation de production de produits en mousse de polyuréthane où des agents de réaction moussants (12) sont amenés dans un moule ayant une doublure en papier (3, 4) et mobile à l'aide d'une bande transporteuse (2), lesdites doublures en papier (3, 4) étant déroulées de rouleaux d'alimentation (5, 11). Les agents de réaction sont mélangés dans un mixer et sont envoyés au travers d'une conduite (10) et des tubes d'admission (8, 9) à un ajutage (7) ayant une fente verticale dont la longueur correspond sensiblement à la hauteur désirée du produit fini. Les agents de réaction sont ainsi amenés au moule en étant étalés sur sa hauteur de manière que les agents de réaction adhèrent immédiatement sur la face de papier (4) et qu'il ne soit pas nécessaire de les déplacer verticalement vers le haut depuis le fond (3) du moule, ce qui permet ainsi d'obtenir une surface très plane du produit fini sans fissures ni autres défauts dus aux tensions entre le papier (4) et les agents de réaction moussants (12).
PCT/DK1984/000074 1983-08-12 1984-08-08 Procede et installation de production de produits en mousse synthetique WO1985000775A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK369783A DK149223C (da) 1983-08-12 1983-08-12 Fremgangsmaade og anlaeg til fremstilling af produkter af polyurethanskum eller lignende
DK3697/83 1983-08-12

Publications (1)

Publication Number Publication Date
WO1985000775A1 true WO1985000775A1 (fr) 1985-02-28

Family

ID=8125784

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1984/000074 WO1985000775A1 (fr) 1983-08-12 1984-08-08 Procede et installation de production de produits en mousse synthetique

Country Status (4)

Country Link
EP (1) EP0153377A1 (fr)
AU (1) AU3317784A (fr)
DK (1) DK149223C (fr)
WO (1) WO1985000775A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990011179A1 (fr) * 1989-03-23 1990-10-04 Cheri Foam Limited Production de materiau mousse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2297756B (en) * 1995-02-13 1998-11-18 Gen Electric RTV silicones comprising difunctional organosilicon compounds
EP1853658B1 (fr) 2005-03-03 2009-02-18 Wacker Chemie AG Utilisation de composes de dioxyde de silicium en tant qu'auxiliaires d'ecoulement dans la fabrication de resines solides de polyvinylacetate

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE365154B (fr) * 1969-08-07 1974-03-18 Sekisui Plastics
DE2946396A1 (de) * 1978-11-20 1980-05-29 Reeves Bros Inc Verfahren und vorrichtung zum kontinuierlichen herstellen von polyurethanschaum
GB1596464A (en) * 1977-01-29 1981-08-26 Metzeler Schaum Gmbh Applicator for flowable reaction compositions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE365154B (fr) * 1969-08-07 1974-03-18 Sekisui Plastics
GB1596464A (en) * 1977-01-29 1981-08-26 Metzeler Schaum Gmbh Applicator for flowable reaction compositions
DE2946396A1 (de) * 1978-11-20 1980-05-29 Reeves Bros Inc Verfahren und vorrichtung zum kontinuierlichen herstellen von polyurethanschaum

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990011179A1 (fr) * 1989-03-23 1990-10-04 Cheri Foam Limited Production de materiau mousse

Also Published As

Publication number Publication date
DK149223C (da) 1987-07-06
DK369783A (da) 1985-02-13
AU3317784A (en) 1985-03-12
DK149223B (da) 1986-03-24
DK369783D0 (da) 1983-08-12
EP0153377A1 (fr) 1985-09-04

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