Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1994-07-14
1998-11-24
Edwards, Newton
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428324, 428331, 4284251, 428454, 428481, 428571, 427382, 427362, 427366, 4273899, 427391, 427394, 427395, 118 60, 118642, 118643, D32B 516, B05D 302, B05C 1100
Patent
active
058404163
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a lining material.
Particularly, but not exclusively, the invention relates to a lining used for coating a plastic or fiber material in a manner that at least one of the surfaces of a sheet-like, film-like or web-like material carries the lining. The lining has thermoplastic properties and is capable of providing desired tightness properties.
BACKGROUND OF THE INVENTION
Until now, linings suitable for the above purpose have been primarily produced by the application of two methods. It can be said that the first method is effected by delivering melted polymer through a slit orifice onto the surface of a web-like material. The polymers used in this method are polyoleofines, which have been melted from a granular starting material for delivering it through a slit orifice. The melt polymer stock is delivered in a single layer or in plural layers directly onto a web-like material advancing on a carrier track with temperature in the contact area typically within the range of 120.degree.-240.degree. C. It is obvious that this produces a corresponding thermal stress for a material to be coated. A natural consequence of this is that a major thermal stress limits the use of heat-sensitive materials in the applications of this method. Although, at least in some applications, it is possible to cool the carrier track, that is, the backing surface.
In addition, a method based on the delivery of polymer effected through a slit orifice is typically hampered by problems associated with the adhesion of a coating. For example, when coating cardboard by using PET (polyethylene terephtalate), suitable raw materials are scarcely available. Also, use requires that an apparatus for effecting the method be provided with expensive accessories. One example of the above can be said to be the commercially available. MELINAR 102 S, which is used by Iggesund and is more expensive than a basic polyester by about 20%. In addition, an apparatus for applying the method by using the above Melinar 102 S polymer requires a specially designed extruder provided with a screw mechanism required by polyethylene terephtalate, as well as a pressure-equalizing pump. There is further required a separate cardboard pretreatment mechanism, which is fitted with heating and ozonation units, the latter explicitly for oxidation. Another drawback in the method is that, if the desired end product includes hot-sealing linings, the adhesion can only be achieved by applying appropriate primers on top of the polyethylene terephtalate layer or by applying oriented polyethylene terephtalate layer (PET or OPET) serving as a basic coating. The primers must be applied prior to the application of a top-layer coating in a separate preceding process stage. The hot-sealing properties for a lining can be produced, for example, by low density polyethylene (LDPE).
Furthermore, when using a method based on slit orifice technology, there will be drawbacks especially when applying a coating on porous materials. The fact is that the melt polymer stock to be applied on the surface of a porous material easily develops pinholes. Thus, this method cannot be used to control the tightness properties of a lining. In order to overcome this drawback and especially to produce a smooth lining, for example, to prevent the penetration of fat, a method based on slit orifice technology generally requires an increase in the thickness of a coating, essentially a polymer layer, to be applied. This is naturally something that increases the consumption of polymer and, thus, the price of an end product. Thick linings create a problem in terms of recycling. Also thick linings generally require, in the processing of recycled stock, especially in the de-inking process, pulper mechanisms designed especially for this purpose.
On the other hand, the use of pigments and fillers in a method based on slit orifice technology is limited by the fact that the above materials will be subjected to thermal and compression stress in a compounding step effecte
REFERENCES:
patent: 3364061 (1968-01-01), Mitchell et al.
patent: 3664912 (1972-05-01), Olson
patent: 4900583 (1990-02-01), Hirabayashi et al.
patent: 4929470 (1990-05-01), Rittenhouse et al.
Abstract of Japanese Patent 52118016.
Clariant Finance (BVI) Ltd.
Edwards Newton
Gray J. M.
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