Coating processes – Nonuniform coating – Edge or border coating
Patent
1996-04-30
1997-11-11
Bareford, Katherine A.
Coating processes
Nonuniform coating
Edge or border coating
427287, 427348, 118 63, 118304, 118323, B05D 304, B05C 1106
Patent
active
056861451
DESCRIPTION:
BRIEF SUMMARY
This is a national stage application of PCT/JP95/02612, filed Dec. 20, 1995.
TECHNICAL FIELD
The present invention relates to a method and apparatus for forming a protective film on a coated surface to temporarily protect the same, and more particularly to such a method and apparatus in which a liquid strippable paint is applied onto a coated surface of an entire car, for example, to form a protective film for temporarily protecting the coated surface while the entire car is transported.
BACKGROUND ART
One known method of temporarily protecting a coated surface of an entire car during the delivery or shipping of the entire car is disclosed, for example, in Japanese Patent Laid-Open Publication No. 6-142604, entitled "Method of Temporarily Protecting a Film of Coating on Vehicle Body". In this disclosed method, an area to be protected, such as the hood, roof or trunk of a vehicle body is coated along its peripheral edge with a strippable paint of a fixed width applied by a roller or a brush, and before or after such coating, the strippable paint is coated by spraying over an area which is narrower than the area to be coated and hence bordered by the roller- or brush-coated strippable paint so that the roller- or brush-coated paint layer and the spray-coated paint layer overlap with each other.
According to this method, since the strippable paint is spray-coated on an area narrower than the area to be protected, the efficiency of the coating work can be improved with the resulting simplification of following or subsequent working processes attained.
In the prior art, however, since dust of the paint being spayed scatters widely, the overlapped coating portion formed by coating the strippable paint with the roller or the brush must have an increased area which will increase the cost.
Furthermore, since the paint dust scattering about beyond the overlapped coating portion may adhere to a portion other than the area to be protected, an appropriate masking process and a process for inspection and correction or mending become necessary. As a result, an increase in cost is not avoidable.
In the case of an article having a large area to be coated, such as an automobile, the strippable paint as it is coated by the roller or the brush tends to become irregular in thickness, resulting in rupture or removal of a protective film of the strippable paint.
With the foregoing drawbacks in view, an object of the present invention is to provide a method and apparatus for forming a protective film on a coated surface with a uniform thickness and at a high coating efficiency while preventing a strippable paint from adhering to a portion other than an area to be protected.
DISCLOSURE OF THE INVENTION
The above object can be achieved, according to the present invention, by a method of forming a protective film on a coated surface for temporarily protecting the same, characterized by comprising the steps of: trickling or dripping a strippable paint onto the coated surface linearly along one side of the periphery of an area to be protected; and blowing the air from the above obliquely against the surface to which the strippable paint is applied, for causing the strippable paint to spread over the area to be protected and then eventually become dry to form a protective film.
In the case where the strippable paint has a high viscosity or is quick at dry, the blow-off air is preferably humidified air.
It is further preferable that dehumidified air is blown against the strippable paint after it is spread over the area to be protected. The dehumidified air thus blown after the humidified air ensures further spreading of the strippable paint and accelerated drying of the strippable paint.
The angle at which air is blown is in the range of 55.degree. to 65.degree., and preferably 60.degree..
It is preferable that the method further includes the step of coating the strippable paint on with a roller or a brush along the periphery of the area to be protected so as to form an overlap between a coating portion formed by this roller- o
REFERENCES:
patent: 3953626 (1976-04-01), Suzuki et al.
patent: 5397606 (1995-03-01), Jeffs
Abstract of Japan 6-142604 (May 24, 1994).
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