WO1997034959A2 - A composite laminar material and a method of making it - Google Patents
A composite laminar material and a method of making it Download PDFInfo
- Publication number
- WO1997034959A2 WO1997034959A2 PCT/GB1997/000759 GB9700759W WO9734959A2 WO 1997034959 A2 WO1997034959 A2 WO 1997034959A2 GB 9700759 W GB9700759 W GB 9700759W WO 9734959 A2 WO9734959 A2 WO 9734959A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- barrier layer
- layer
- substrate
- composite laminar
- ultra
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims abstract description 69
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 230000004888 barrier function Effects 0.000 claims abstract description 56
- 239000000758 substrate Substances 0.000 claims abstract description 41
- 239000000203 mixture Substances 0.000 claims abstract description 38
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 230000009974 thixotropic effect Effects 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 17
- 230000035515 penetration Effects 0.000 claims abstract description 3
- 239000011148 porous material Substances 0.000 claims abstract description 3
- 239000002657 fibrous material Substances 0.000 claims abstract 2
- 239000000178 monomer Substances 0.000 claims description 16
- 239000003999 initiator Substances 0.000 claims description 7
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- 150000002118 epoxides Chemical class 0.000 claims description 5
- 150000002440 hydroxy compounds Chemical class 0.000 claims description 5
- 150000002989 phenols Chemical class 0.000 claims description 5
- 238000009472 formulation Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 239000004519 grease Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 60
- 239000000853 adhesive Substances 0.000 description 28
- 230000001070 adhesive effect Effects 0.000 description 25
- 239000012790 adhesive layer Substances 0.000 description 8
- 238000012546 transfer Methods 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000001464 adherent effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
- D04H1/593—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives to layered webs
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/21—Paper; Textile fabrics
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H13/00—Other non-woven fabrics
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/001—Release paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/16—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising curable or polymerisable compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/32—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming a linkage containing silicon in the main chain of the macromolecule
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
Definitions
- the present invention relates generally to a composite laminar material, and also to a method of making a composite laminar material to which the present invention relates, comprising generally a plurality of layers bonded, laminated or ' otherwise applied to a substrate.
- release liners are backing layers which are removable from a product, very often a product having an adhesive coating, and such release liners have a wide range of applications useful in industry and elsewhere.
- Release liners are disposable layers of a substrate, typically paper, which cover the adhesive and prevent it from coming in to contact with any other surface, but which do not adhere to the adhesive so that the release liner can be stripped away quickly and without carrying off any adhesive, leaving the adhesive layer exposed to be applied to the surface to which the component is to be fixed.
- release liners because they are disposable items, must be made as economically as possible using the least amount of material of the least expensive type available.
- the ability of the release liner to resist attack by aggressive chemicals and/or wide temperature variations means that a high specification is set for the material.
- the release liners may be used both inside and outside buildings, it is important that it should be possible to form them in such a way as to be able to withstand wide variations in humidity and moisture content of the air, as well as wide temperature ranges.
- release liner An important component of a release liner is the release agent against which the adhesive actually contacts, but which does not adhere to the adhesive. Such materials are expensive and it is consequently important to design the production processes for producing release liners in such a way that the minimum amount of release agent is used commensurate with obtaining a secure release from the adhesive when required.
- silicone is used for achieving this purpose since it has well known abilities to resist adhesion. Silicone, however, is readily absorbed into paper, and if a relatively low specification paper is to be used as the substrate it is necessary to interpose a barrier layer between the substrate and the silicone in order to prevent absorption which would have the dual disadvantage of consuming large quantities of silicone and reducing the non-adherent effect.
- a third disadvantage lies in the fact that impregnation of the substrate by silicone would result in an at least partially non-adherent surface on each side of the substrate, and very often it is not desirable for the opposite face from that coated with silicone to have non-adherent properties.
- two-sided release liners are sometimes used for special purposes, in the majority of cases it is essential for the release agent to be located only on one face.
- polyethylene which is extruded in a thin film onto the substrate.
- Polyethylene is highly resistant to absorption of release agents such as silicone, and thus performs this task well; it does have many disadvantages, however, in particular it has a very low temperature tolerance and polyethylene laminated paper can usually not withstand temperatures greater than 100°C without serious delamination taking place resulting in the appearance of bubbles and wrinkles on the surface which, in order properly to perform its function as a release liner, must be as smooth and flat as possible.
- Such bubbles and wrinkles can cause considerable problems not only when attempting to apply an adhesive layer to the release agent, but also when applying the product.
- the release liner is intended to be coated with adhesive.
- the adhesive is then treated to render it tacky and the product or face stock applied thereto.
- the adhesive bonds with the surface of the product more strongly than to the release agent so that upon subsequent removal of the release liner the tacky adhesive surface bonded to the product or face stock is left exposed and ready for contact with the surface against which the component (product) is to be fixed.
- Adhesives may be naturally curing or drying, or may be cured by the application of heat or ultra-violet radiation or the like.
- the substrate whatever material is chosen for this layer, must preferably have a high degree of stability, adequate strength, that is burst strength, tear strength and tensile strength, have a high degree of uniformity and resistance to dimensional variation with changes in temperature and humidity.
- the barrier layer to which the release agent is applied must have a high degree of consistency, must be highly impermeable to the release agent, must be as economical as possible and should also preferably have a high degree of surface flatness in order to minimise the quantity of release agent necessary in order to achieve the required release effect.
- a composite laminar material suitable for use in the production • of a release liner comprises a substrate of at least partly porous material, a barrier layer, on at least one surface of the substrate, of substantially impermeable material having a smooth surface facing away from the substrate, the material of the barrier layer being one to which a layer of low- adhesion release agent such as silicone will bond if applied thereto.
- the composition from which the barrier layer is made can be rendered thixotropic such as to permit the layer to be spread on to one surface of the substrate without substantial absorption taking place thereby ensuring that the barrier layer, whilst being securely bonded to the substrate upon curing, does not penetrate into the body of the material, and certainly does not appear on the opposite face of the substrate from that to which it is applied.
- the barrier layer is composed of a material which is curable by the action of ultra-violet light rather than one which is merely dried prior to the application of the release agent. This is important in ensuring the quality of the surface finish of the barrier layer and in economising on the production process which will be described in more detail hereinbelow.
- the barrier layer includes a mixture of oligomers and monomers.
- This mixture of oligomers and monomers may comprise or include epoxide based oligomers and monomers.
- the said mixture may comprise or include oligomers and monomers of acrylic acid.
- the said ultra-violet curable material includes hydroxy compounds and may further include photo initiators.
- the said ultra-violet curable material may also include a modified phenol.
- the form of the substrate may be different in different embodiments, and the requirement for economy or the requirement for high tolerance to moisture or temperature variations may predominate in the decision on the precise material selected for this purpose.
- the substrate is a woven or non-woven fibrous web, typically paper.
- the material of the barrier layer may be impermeable not only to water, but also to grease, oil and other like such materials, including silicone.
- the present invention also comprehends a release liner comprising a composite laminar material such as that defined hereinabove in sheet or web form, having a layer of release agent, such as silicone, bonded to the said barrier layer on at least one face thereof.
- the substrate may have a barrier layer formed on each of two opposite major faces and may, likewise, receive respective layers of release agent on respective faces.
- a method of producing a composite laminar material as hereinabove defined comprises the steps of applying a barrier layer of substantially impermeable material in thixotropic form (or as part of a thixotropic composition, to at least one face of a web of non-woven fibrous or other laminar material in such a way as to lie on the surface of the web without substantial penetration such as by absorption, the barrier layer being cured by any suitable process, such as irradiation with ultra- violet light or the application of heat, to form a smooth surface, and subsequent application of a layer of a release agent such as silicone to the said barrier layer in such a way as to form a substantially continuous layer of release agent over at least a part of the area of the substrate covered by the barrier layer.
- the barrier layer may be a thixotropic composition which is curable by irradiation with ultra-violet light and preferably includes a mixture of oligomers and monomers, hydroxy compounds and photo initiators.
- a composition from which the barrier layer is to be formed may comprise a thixotropic mixture of oligomers and monomers of acrylic acid with photo initiators and modified phenol, or epoxide-based oligomers and monomers, each of which composition is curable by irradiation with ultra-violet light .
- the method of the invention includes application of the thixotropic composition for forming the barrier layer to at least one face of the web by an applicator roller coated with the said composition.
- the method of the present invention may be performed in an advantageous manner by spreading the thixotropic composition over one or more spreader rollers to form a uniform film of consistent thickness before the composition is transferred to the applicator roller.
- the barrier layer composition is coated on to the said substrate, cured, and then the release agent applied in the same pass through a series of roller applicators.
- Figure 1 is a schematic view showing a composite layer formed as an embodiment of the present invention
- Figure 2 is a schematic perspective view, with the thickness exaggerated for clarity, of an exemplary product made using the material of the present invention
- Figure 3 is a schematic view illustrating the performance of one step of the method of the invention.
- Figure 4 is a schematic representation of apparatus usable in performing the method of the invention to produce the material of the invention.
- the multiple layer material illustrated in Figure 1, and generally indicated with the reference numeral 11 comprises a substrate 12 which in this case may be a relatively cheap paper, even recycled paper.
- a barrier layer 13 which is bonded to the substrate without significantly penetrating the body of the material of the substrate such that the barrier material does not appear on the opposite face of the substrate.
- the barrier layer in this embodiment is a cured mixture of epoxide based oligomers and monomers with hydroxy compounds and photo initiators. As will be described in more detail below the mixture is applied in a thixotropic form, spread thinly over the surface of the substrate 12 so as to lie only on that surface, and then cured by irradiation with ultra-violet light.
- Such material has a very much greater temperature resistance than the prior art polyethylene used previously as a barrier layer, and may withstand temperatures of, for example, up to 220°C.
- the material can bond strongly to the substrate upon curing and remains only on one side of the substrate due to the thixotropic nature of the material upon application and the rapidity of curing. This makes it possible to create a very smooth flat surface which has considerable advantages as will be discussed below when the next layer, namely a silicone layer 14 is applied.
- the silicone may be applied in the same way as the barrier layer using any of the known techniques for the application. However it is applied it is important to control the quantity and consistency of the silicone layer, and at the same time to achieve a high speed of application. Because the surface of the barrier layer 13 is extremely smooth and uniform it is possible to coat this with an extremely thin layer of silicone whilst still achieving the same physical properties and achieving the same release function as conventional release liners having a silicone layer of usual thickness. Another advantage of this smoothness is that it will allow smaller quantities of adhesive to be applied than is conventional with, eg paper-based release liners.
- a product which, as illustrated in Figure 2, may be a sheet of self-adhesive labels 16
- the composite sheet material 11 illustrated in Figure 1 is first coated with an adhesive layer 15 and then treated to make the adhesive layer 15 tacky, for example by physical or chemical means.
- Products, or face stock 16 are then applied thereto in any known way.
- an overlying sheet 17 of printed paper (face stock) which is preliminarily stamped with separation lines 16a defining individual labels 16.
- the entirety of the sheet 17 is applied to the composite layer 11, however, and upon such application the adhesive layer 15 adheres to the undersurface of the layer 17 to bond this to the composite layer 11.
- the product is then stable and may be packaged, shipped, stored and sold in this form.
- a corner such as the corner 19 of the nearest label 16 separates from the underlying layer at the junction between the adhesive and the silicone which allows ready release of the adhesive.
- the adhesive remains attached to the label 16 and this can then be peeled from the backing strip comprising the composite strip 11 and placed in position for its intended use where it will remain by the adhesion of the adhesive layer 15.
- release liners in accordance with the principles of the present invention, including industrial components both of a rigid and flexible nature intended to be secured in place by adhesive and any other of the wide range of known applications for release liners.
- the material described not only has a high temperature resistance, but is also resistant to aggressive chemicals (such as those appearing in some industrial products such as bitumen sheets) and has a high resistance to dimensional variation, upon changes in humidity so that it can be used in outdoor situations even where moisture precipitation may be present.
- the barrier layer may be a mixture of oligomers and monomers of acrylic acid with photo initiators and modified phenol .
- This mixture can also be made thixotropic and is curable by irradiation with ultra-violet light.
- Particular properties of this material include, as with the material specifically described above, a high resistance to dimensional variation even at relatively high temperatures, and a very good resistance to chemical attack and dimensional variation due to moisture or humidity changes. In experiments conducted with specimen materials it was established that shirlastain, an industrial test material, did not significantly penetrate the barrier layer formed from the above identified material .
- FIG 3 illustrates an exemplary process for application of a thixotropic composition to a substrate.
- a substrate 12 is passed between two rollers 20, 21 the upper roller 20 of which is a pressure roller, and the lower roller 21 of which is an applicator roller.
- the applicator roller 21 rolls in contact with a transfer roller 22 which in turn engages a pick-up roller 23 which is partly immersed in a bath of the thixotropic material 24 contained in a reservoir 25.
- a doctor blade 26 closely positioned against the transfer roller 22 ensures that a uniform film of material of the surface of the transfer roller 22, which is transferred to it from the pick up roller 23 as a result of its partial immersion in the bath 24, is transferred to the applicator roller 21.
- Adjustments to the speed of rotation of the rollers and the proximity of the doctor blade 26 to the transfer roller 22 can adjust the thickness of the film of thixotropic material on the surface of the applicator roller 21 and therefore the thickness of the barrier layer 13 applied to the substrate 12 as it passes between the two rollers 20, 21.
- the barrier layer 13 itself has a smooth surface which is enhanced by rapid cross linking caused by irradiation with ultra-violet light by an array of lamps 27, closely spaced along the path of the composite substrate/barrier layer web 12, 13.
- FIG 4 illustrates apparatus including the applicator apparatus such as that illustrated in Figure 3 , and in which corresponding components are identified with the same reference numerals as in Figure 3.
- the web 12 is unwound from a roll 40 and turned at a pair of rollers 42 to a vertical path along which it travels past a barrier layer application station including application roller 21 and pressure roller 20 as described in relation to Figure 3.
- the ultra ⁇ violet lamps 27 passes between two rollers 43, 44 of a silicone application station drawing silicone from a bath 35 via a pick-up roller 45 and transfer roller 46 and applying it as a layer 14 by the application roller 43.
- the composite web 12, 13, 14 passes a further set of ultra-violet lamps 47.
- the composite web then passes between a pair of rollers 30, 31 to a loop 50 where the web is inverted with a twist (represented schematically) from which it passes to a pair of rollers 33, 34 at which it is turned to a downward vertical run with the coated face facing in the opposite direction, that is towards the previously described application stations.
- the composite web passes two further, similar, application stations at which a second barrier layer and a second silicone layer are applied to the opposite side of the substrate to provide double-sided release liner.
- the barrier layer and silicone layer applicator rollers and ultra-violet lamps are identified with the same reference numerals as for the ascending run, raised by 100.
- the double- sided release liner passes between two rollers 37, 38 to a take-up reel 51.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU21663/97A AU2166397A (en) | 1996-03-20 | 1997-03-19 | A composite laminar material and a method of making it |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9605880.5A GB9605880D0 (en) | 1996-03-20 | 1996-03-20 | A composite material and a method of making a composite laminar material |
GB9605880.5 | 1996-03-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1997034959A2 true WO1997034959A2 (en) | 1997-09-25 |
WO1997034959A3 WO1997034959A3 (en) | 1997-10-30 |
Family
ID=10790738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1997/000759 WO1997034959A2 (en) | 1996-03-20 | 1997-03-19 | A composite laminar material and a method of making it |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2166397A (en) |
GB (2) | GB9605880D0 (en) |
WO (1) | WO1997034959A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2002321342A1 (en) | 2002-07-18 | 2004-02-09 | Loparex Oy | A manufacturing substrate and a method for forming it |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4303696A (en) * | 1975-05-07 | 1981-12-01 | Design Cote Corp. | Radiation curing of prepolymer coating compositions |
US4609589A (en) * | 1984-01-18 | 1986-09-02 | Oji Paper Company, Ltd. | Release sheet |
US4720479A (en) * | 1987-06-01 | 1988-01-19 | Daubert Coated Products, Inc. | Carbonless paper sheet materials |
US5023138A (en) * | 1987-11-02 | 1991-06-11 | Acumeter Laboratories, Inc. | Method of in-line production of successive barrier- and silicon-coated inexpensive porous and absorbent paper and similar substrates, and products produced thereby |
JPH01239190A (en) * | 1988-03-16 | 1989-09-25 | Honshu Paper Co Ltd | Polyethylene laminated paper |
JP2653839B2 (en) * | 1988-06-28 | 1997-09-17 | 王子製紙株式会社 | Release paper for adhesive paper |
US5084354A (en) * | 1990-10-23 | 1992-01-28 | Daubert Coated Products, Inc. | Stabilized paper substrate for release liners |
JPH06123100A (en) * | 1992-10-12 | 1994-05-06 | New Oji Paper Co Ltd | Base material for release paper |
GB9311092D0 (en) * | 1993-01-28 | 1993-07-14 | Du Pont Int | Extrusion process |
JPH07216327A (en) * | 1994-01-28 | 1995-08-15 | New Oji Paper Co Ltd | Method for producing base material for release paper |
-
1996
- 1996-03-20 GB GBGB9605880.5A patent/GB9605880D0/en active Pending
-
1997
- 1997-03-19 GB GB9705642A patent/GB2311236A/en not_active Withdrawn
- 1997-03-19 WO PCT/GB1997/000759 patent/WO1997034959A2/en active Application Filing
- 1997-03-19 AU AU21663/97A patent/AU2166397A/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
AU2166397A (en) | 1997-10-10 |
WO1997034959A3 (en) | 1997-10-30 |
GB9705642D0 (en) | 1997-05-07 |
GB2311236A (en) | 1997-09-24 |
GB9605880D0 (en) | 1996-05-22 |
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