Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1987-06-26
1989-12-12
Lesmes, George F.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
427531, 427259, 427282, 428343, 428494, 428515, 428520, 428522, 524560, 524566, B05D 306, B32B 516
Patent
active
048867047
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a novel strippable coating film and a method of using the same. More particularly, it relates to a strippable coating (or masking) film for creating attractively finished boundaries in multi-color painting of automobiles and the like, as well as a coating method using the same.
BACKGROUND ART
Recently, in the field of automobiles, motorcycles and the like, so-called multi-color painting (i.e., painting in two or more colors) of various parts (e.g., bumpers, decorative body lines and stripes, motorcycle gasoline tanks, motorcycle windshields, and the like) prevails in the manufacture of new products or the repair of such vehicles.
In multi-color painting, it is regarded as important from the viewpoint of commercial value to prevent the intermingling of colors in boundaries (i.e., the regions bounding different colors) and thereby create sharp boundary lines.
Thus, it has been a conventional practice in multi-color painting to cover the parts not intended to be coated with masking tape, used newspaper, film or the like, protect the boundaries with masking tape, apply a coat of paint, and then remove the masking tape and the like.
However, the use of masking tape has the disadvantage that the boundaries cannot be finished as attractively as might have been expected, because (1) it is difficult to apply masking tape in a straight line and (2) portions of the applied masking tape may separate from the substrate and allow the paint to penetrate into the gaps therebetween.
DISCLOSURE OF THE INVENTION
Accordingly, the present inventors studied, from various angles of vision, the coating method comprising the step of applying a strippable paint to an object to be coated, drying the applied strippable paint, cutting the film so formed with a suitable cutting tool, stripping off the unnecessary portions of the film, and then applying a desired coat of paint to the exposed parts of the object to be coated.
As a result, the use of a knife as the cutting tool was found to be disadvantageous in that the precision of the finish may vary according to the skill of the worker, it is difficult to cut the film alone without causing damage to the base material or substrate comprising the object to be coated, and the knife edge will soon be worn away and become dull.
Thus, the present inventors made further studies with their attention focused on the cutting method using a laser beam.
A carbon dioxide gas laser, which is recently used in the cutting of materials, makes it possible to cut metallic and non-metallic materials, glass and the like easily and to cut wood and the like without producing noises or swarf. Moreover, paper, cloth, leather and the like can also be cut cleanly and rapidly. However, in the cutting of thin plastic films such as a thin film (e.g., a strippable coating film) used for protecting a surface of an article temporarily, or a thin layer forming a part of an article, it has been found difficult to cut only the thin film or thin layer (hereinafter referred to simply as thin film) by means of a CO.sub.2 gas laser without causing damage to the main body of the article.
On the other hand, a YAG laser beam which is one type of laser beam may be passed through optical fibers, so that it is not only useful for purposes of optical communication, but also now in use for microscopic drilling or other processing of semiconductors and printed circuit materials. However, few publications can be found that report its use for the processing of a surface layer alone. Experiments using a YAG laser have revealed the intended purpose of cutting a film cannot be accomplished satisfactorily. Accordingly, the present inventors have made an investigation on the type of film used and has found that, if a strippable paint containing 1 to 20% by weight of carbon black (based on the resin component) in the dry film is applied, only the overlying film can be cut with the aforesaid laser and, therefore, a method for creating attractive boundaries can be realized.
Specifically, the pre
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Database WPIL, No. 85-021113, Derwent Publications, Ltd., London, GB; JP-A-59 215 365 (5-12-84) (Abstract).
Kamada Keiichi
Ohkita Yasuo
Torikai Motoyuki
Lesmes George F.
Mitsui Toatsu Chemicals Incorporated
Monroe, II James B.
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