Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1995-12-05
1998-01-06
Cameron, Erma
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156321, 156322, 156324, 427318, 427366, 427379, 4273881, 427409, C09J 502, C09J 506
Patent
active
057050171
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method for the production of a steel sheet coated with a fluororesin film, and more particularly proposes a technique for strongly applying a fluoro- resin film containing fluorine atom therein onto a surface of a steel sheet.
2. Background and Related Art
In general, the fluororesin is excellent in the properties such as corrosion resistance, stain resistance, adhesion resistance, heat resistance, incombustibility and the like. Therefore, if a stainless sheet or the like can firmly be covered with a film of this fluororesin, the resulting coated steel sheet possesses both the above properties inherent to the film and the properties inherent to the stainless steel (strength and workability).
The steel sheets coated with the fluororesin film having the above properties can widely be applied to a toasting mold for baking breads, cakes, confectioneries and the like, food cooking tools and food working tools, heating cook tools such as an inner plate of a microwave oven, an inner pot of a rice cooker, a top plate of a gas table and the like and further kitchen tool materials such as material for oven hood and so on. Therefore, it is desired to establish a technique for industrially producing the above steel sheets.
In this connection, materials obtained by coating stainless steel sheet or plated steel sheet with a fluororesin have hitherto been disclosed in JP-A-61-137534, JP-A-61-138567 and JP-B-63-11147. In JP-B-59-16836 and JP-B-59-16837 are disclosed materials obtained by coating Al-plated steel sheet with a fluororesin. In JP-B-54-24434, JP-B-59-10304 and JP-A-63-126728 are disclosed materials obtained by coating Al or Al alloy body with a fluororesin film. In JP-A-63-168333 is disclosed a method of coating a steel sheet with a fluororesin film through a thermosetting adhesive.
According to these conventional techniques, however, the coating by means of the adhesive is difficult to achieve and also the strong covering is difficult because the fluororesin film has low surface tension and hence a strong non-adhesion property. Particularly, there has not yet been developed an effective method of strongly applying onto the surface of the steel sheet with respect to fluororesin films containing two or more fluorine atoms per one molecule unit such as ethylene tetrafluoride-perfluoroalkylvinyl ether copolymer resin (PFA), ethylene tetrafluoride-propylene hexafluoride copolymer resin (FEP) and ethylene tetrafluoride-ethylene copolymer resin (ETFE) up to the present, so that the practical use of these films is actually delayed.
In this point, the inventors have already proposed in JP-A-5-162243 a method wherein a mixture of fluororesin and heat-resistant resin is previously applied onto a surface of aluminum plated steel sheet, zinc alloying plated steel sheet or stainless steel sheet and a resin film of the same kind is applied thereon and pressed through rolls, during which the interface between the film and the steel sheet is heated to a temperature just above a melting point of the film to weld to the undercoat resin layer.
However, this technique adopts a simple method of conducting heat pressing only by single heating, so that there are problems that the adhesion force between the film and the steel sheet becomes insufficient and that melt-breaking of the film and poor adhesion are caused because only the surface temperature of the steel sheet is controlled.
It is a main object of the invention to adhere a fluororesin film containing two or more fluorine atoms per one molecule unit and having a poor adhesion property onto a surface of a stainless steel sheets or the like at a high adhesion force.
It is another object of the invention to adhere continuously through roll pressing a fluororesin film containing two or more fluorine atoms per one molecule unit onto a surface of a metal without causing melt breakage and poor adhesion.
SUMMARY OF THE INVENTION
As a method for achieving the object of the invention, in view of the
REFERENCES:
patent: 4258089 (1981-03-01), Anderson et al.
patent: 5178915 (1993-01-01), Moyle et al.
Fujisawa Hideshi
Irie Toshio
Kuroda Morimasa
Sakamoto Yasuhei
Seto Koji
Cameron Erma
Kawatetsu Galvanizing Co., Ltd.
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