Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Patent
1995-06-29
1998-02-03
Kiliman, Leszek
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
428501, 428502, 428503, 428505, 428507, 428511, 428514, 428524, 428526, 428530, 428531, 428535, 4285375, 4283044, 428218, 1562722, 1562755, 1562757, 1563068, 1563071, 1563073, 156325, 156327, 1563311, 1563313, 1563317, B32B 700, B32B 2742, B32B 300
Patent
active
057142696
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a film suitable in the production of laminated particle boards, a method for producing the film and a method for producing laminated particle boards with the use of the film.
BACKGROUND OF THE INVENTION
Cellulose papers with a weight of between 40 and 140 grams per square meter untreated are normally used when making decorative foils. The papers can be impregnated with melamine thermosetting resins or left untreated. Such foils require an adhesive for lamination. The degree of impregnation and the percentage of resin used have a direct effect on the internal bond strength of the paper, as well as on the porosity, cutting qualities and machinability. The essentially untreated papers can contain a small amount of resin (2-3%) which generally is added during manufacturing. The papers can be delivered with a varnish top coat or can be top coated after lamination.
Preimpregnated papers are papers treated during the paper making process with a resin system such as melamine or urea formaldehyde, usually together with acrylic, which allows the sheet to remain flexible after the resins are fully cured. The resin is supplied through a size press and calendered, either on the paper machine or later. The calendering provides a good printable surface and which surface is easily coated. These papers can be chemically embossed and are also available with pre-applied hot melt adhesives.
Papers can also be treated, after they have been manufactured, with a similar resin system as previously stated, so called post-impregnated papers. In these papers the paper fibres are encapsulated with resin and the voids and air spaces in the paper are filled with resin. The papers may be top coated and may have hot melt adhesives applied at the point of manufacture.
When producing a laminated particle board according to the prior art the particle board or agglomerate is first pressed and after the final pressing step, sanded to make the surface smooth and then a layer of glue is applied followed by application of a sheet of film or foil as described above and then heating and compressing the assembly. This method for producing laminated particle boards according to the prior art can be carried out continously or step-wise.
With a conventional foil or film the gases produced by the particle board during a direct laminating process would remain trapped inside which gives rise to the formation of bubbles between the film and the particle board which may cause the film to burst.
SUMMARY OF THE INVENTION
An object according to the present invention is to provide a film by means of which the above described drawbacks of the prior art are overcome.
Another object of the present invention is to provide a method by means of which a film is obtained which film has suitable properties which makes it especially suited for the production of laminated particle boards by means of a continuous process.
A further object according to the present invention is to provide a method for producing a laminated particle board by means of a continous process with such film.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates schematically a process for making the film according to the present invention.
FIG. 2 illustrates a direct lamination process according to the present invention.
FIG. 3 is a plot of water vapour transmission (3a) and water vapour permeance (3b) respectively against time for films according to the present invention and standard films used according to the prior art.
DETAILED DESCRIPTION OF THE INVENTION
The film according to the present invention comprises a base paper with a weight of from 30 to 150 g/m.sup.2 which is impregnated with resins which are almost fully cured and are permeable to the gases formed within the particle board (agglomerate) during the production of the laminated particle board. Furthermore, the film is provided with a partially cured layer of glue on the side facing the particle board and a fully cured lacquer or varnish layer on the top. The finished film thus comprises a
REFERENCES:
patent: 4158712 (1979-06-01), Degens
Casco Nobel AB
Kiliman Leszek
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