JPS60248265A - Method for painting separately plastic product - Google Patents

Abstract

PURPOSE:To prevent the deterioration in gloss of an unpainted surface by covering the unpainted surface with a protective film when the painted surface is treated with an organic solvent to prevent the damage of the unpainted surface with the organic solvent. CONSTITUTION:In a separate painting method of a plastic product for forming a separation line 3 from an unpainted surface 2 which is left to leave the original color of the product intact to paint other colors on the surface of a product 1, the surface 4 to be painted is masked with a masking jig 5 by using the separation line 3 as the boundary, and then a protective film 6 is formed on the unpainted surface 2. Then after the surface 4 to be painted is exposed by removing the masking, the surface 4 to be painted is treated with an organic solvent to increase the adhesive strength of the paint to the surface 4 to be painted. Subsequently, the painting of the surface 4 to be painted, the drying of the painted surface 4, and the release of the protective film 6 are successively carried out. Consequently, the unpainted surface is not damaged by the organic solvent, and the deterioration in gloss of the unpainted surface can be prevented.

Description

Detailed Description of the Invention A1 Purpose of the Invention (1) Industrial Field of Application The present invention provides a method for forming lines between the surface of a synthetic resin product and a non-painted surface that retains the color of the product itself. Coatings of synthetic resin products for coating other colors to form relate to methods.

(2) Prior Art Conventionally, for such separation, the method has been to skin the synthetic resin product and immerse the synthetic resin product in an organic solvent such as [1-1-1) IJ Dichlorothane.

(3) Problems to be Solved by the Invention However, in the above method, the non-painted surface is treated by contacting the non-painted surface with an organic solvent through the masking paper, resulting in poor gloss of the non-painted surface.

The present invention has been made in view of the above circumstances, and provides a method for coating synthetic resin products that prevents deterioration of the gloss of the non-painted surface due to organic solvents by covering the non-painted surface with a protective film. The purpose is to provide

B0 Structure of the Invention (1) Means for Solving Problems The method of the present invention includes a step of masking the painted surface to be painted using lines as boundaries; a step of forming a protective film on the non-painted surface; a step of releasing the masking state to expose the painted surface; a step of treating the painted surface with an organic solvent to improve the adhesion of the paint to the painted surface; a step of painting the painted surface; a step of drying the painted surface; The step of peeling off the protective film is performed in sequence.

(2) Function When treating the surface to be painted with an organic solvent, the non-painted surface is covered with a protective film, so the non-painted surface is not damaged by the organic solvent.

(3) Examples Examples of the present invention will be explained below with reference to the drawings.
First, in FIGS. 1(a) to 1(e) showing a first embodiment of the present invention, a synthetic resin product 10 made of, for example, polypropylene is coated with a non-painted surface 2 that leaves the color of the synthetic resin product 1 itself intact. Paint is applied in between to form the line 3, and the working process will be explained in order below.

In FIG. 1(a), a coating surface 4 to be coated is masked using a masking jig 5 using a line 3 as a boundary.

Next, in FIG. 1(A), a protective film 6 (
(shown by the steel wire at the bottom right). In forming this protective film 6, a water-soluble protective agent is applied using a spray nozzle or the like.

After forming the protective film 6, the masking jig 5 is removed to expose the painted surface 4, as shown in FIG. 1(C).

In this way, since the masking jig 5 is removed immediately after the protective film 6 is formed, the masking jig 5 can be attached to the synthetic resin product 1 by simply paying attention to the line 3 as the boundary for the coating. , it can be easily carried out and masking work is facilitated.

Next, the painted surface 40 is subjected to surface treatment, but prior to that, the synthetic resin product 1 is dried. After this drying, the synthetic resin product 1 is immersed in an organic solvent to perform surface treatment on the painted surface 40. At this time, since the non-painted surface 2 is covered with the protective film 6, the non-painted surface 2 is not damaged by the organic solvent. After this surface treatment, the synthetic resin product 1 is dried to complete the surface treatment step.

After the surface treatment, the painted surface 4 has the following properties as shown in Figure 1(d):
Painting (indicated by the diagonal line at the bottom left) is applied.

5- After that, after the painted surface 4 has dried, the protective film 6 on the non-painted surface 2 is peeled off, as shown in FIG. Painting is completed.

In such a painting process, it is possible to prevent the painted surface 4 from drying out as much as possible.

FIGS. 2(a) to 2(e) show a second embodiment of the present invention, and show the painting process when leaving a striped non-painted surface 2 on the surface of the synthetic resin product 10. Basically, the steps similar to those in the first embodiment are sequentially performed, and the same reference numerals are given to the parts corresponding to those in the first embodiment, and detailed explanation thereof will be omitted.

C6 Effects of the Invention As described above, in the method of the present invention, the painted portion is determined by the line as the boundary. a step of releasing the paint to expose the surface to be painted; a step of treating the paint with an organic solvent to improve the adhesion of the paint to the paint surface; a step of painting the paint surface; a step of drying the paint surface; Since the steps of removing the protective film and ; are performed sequentially, when the painted surface is treated with an organic solvent, the non-painted surface is covered with a protective film and is not damaged by the organic solvent, so that the gloss will not deteriorate. Prevented.

[Brief explanation of drawings]

FIGS. 1(a) to (e) are simplified diagrams showing the steps of the first embodiment of the present invention, and FIGS. 2(a) to (e) are simplified diagrams showing the steps of the second embodiment of the present invention. be. 1...Synthetic resin product, 2...Unpainted surface, 3...Painted area is a line, 4...Painted surface, 6...Protective film 7- Fig. 2 Fig. 1

Claims (1)

[Claims] The coating area of the synthetic resin product is coated with another color to form a line between the surface of the synthetic resin product and the non-painted surface that retains the color of the product itself. a step of masking the painted surface to be painted using the line as a boundary; a step of forming a protective film on the non-painted surface;
a step of releasing the masking state to expose the painted surface; a step of treating the painted surface with an organic solvent to improve the adhesion of the paint to the painted surface; a step of painting the painted surface; a step of drying the painted surface; A method for coating a synthetic resin product, comprising sequentially performing the steps of peeling off the protective film.