JPS60251966A - Masking method used in painting - Google Patents

Abstract

PURPOSE:To certainly fix a masking jig and to facilitate the detachment thereof, by arranging the string part of the jig to the boundary between a non-painting part and a part to be painted and covering the non-painting part with a film part before securing the film part by a sticking agent. CONSTITUTION:The string part 2 of a masking jig 1 is inserted into the groove G of an article W to be painted. Next, the surface of the non-painting part M of the article W to be painted with the film part 3 secured to the string part 2 and the end part 3a of the film part 3 in the side opposite to the string part 2 is involved in the rear surface side of the article W to be painted and secured to the article W to be painted by a sticking agent 6. If painting and the baking of a paint film are performed in this state, the jig 1 is certainly fixed and, therefore, a painted part having an accurate parting line is obtained and the detachment of the jig also becomes rapid and easy.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is for coating non-painted parts using a masking jig for painting, which is used when painting only a part of the part of the object to be painted. Regarding the masking method for painting, this method is particularly useful when painting resin automobile pans, etc.

(Prior art) When painting only a part of the surface of various products such as metal or resin, or when applying multiple types of coatings with different colors to the surface of these products, it is necessary to paint the object to be coated during the painting process. It is necessary to expose only a portion of the painted portion and cover the other unpainted portion.

Conventionally, in order to coat the non-painted parts of the object to be coated, in order to obtain a boundary line between the surface of the non-painted part and the surface of the part to be painted, that is, a parting line, the operator manually removed the unpainted part of the part to be coated. Adhesive tape was attached to the area close to the painted area, and a masking material covering the non-painted area was fixed to the object using the adhesive tape.

In this way, masking work was performed by pasting tape onto the object to be painted, but the work had to be done carefully to obtain accurate parting lines, and work efficiency was affected when painting mass-produced products. The problem was that it was poor and impractical.

For this reason, a painting masking is used, which has a set part that is attached to the non-painted part of the object to be painted and forms a parting line for the paint applied to the surface of the part to be painted, and a membrane part that is fixed to this part and covers the non-painted part. A jig was proposed by the applicant, which made it possible to easily and quickly attach a painting masking jig to an object to be coated, and to obtain accurate, clear, and sharp parting lines.

However, when this masking jig for painting is attached to the object to be painted and painted, the masking jig comes off the object due to the wind pressure during spraying or the wind pressure of hot air during baking of the paint. In order to prevent this, the film part of the masking jig and the object to be coated were fixed with adhesive tape, so the masking jig was removed after applying the adhesive tape to the object and baking the paint. In order to do this, it was necessary to first remove the adhesive tape that had adhered to the object to be coated, which was an extremely complicated process.

(Objective of the Invention) The present invention allows the masking jig to be easily and quickly attached to the object to be coated. The objective is to not only be able to reliably fix the masking jig so that it does not come off the object to be coated, but also to be able to easily and quickly remove the masking jig.

(Structure of the Invention) In order to achieve the above object, the present invention provides a coating method that uses a coating masking jig to paint a painted part of an object having a non-painted part and a painted part. A masking method for painting that covers a non-painted area, comprising a set part that forms a parting line for paint applied to the surface of the covered part, and a film part that is fixed to the set part and covers the non-painted part. After installing the assembled part of the masking jig for painting at the boundary between the non-painted part and the to-be-painted part, the non-painted part is covered with the film part, and the non-painted part and the film part are fixed with an adhesive. This is a masking method for painting characterized by:

(Example) Hereinafter, the coating masking method according to the present invention will be explained based on the drawings.

FIG. 1 shows an example of an automobile bumper as an object to be coated.

Modern car bumpers are now mainly made of synthetic resin, which has more elasticity than metal and absorbs shock, in order to improve the car's body protection function in the event of a collision and increase the degree of freedom in shaping. The automobile bumper shown in FIG. 1 is molded from synthetic resin.

The automobile bumper W shown in FIG. 1 has a groove G formed along the longitudinal direction in the central part of its surface.
Either only the lower side is painted, or the upper and lower sides are painted with separate paints of different colors.

FIG. 2 shows a masking jig 1 used when painting only the lower part C of the object W shown in FIG. It is a diagram.

The masking jig 1 for painting has a solid cross section that forms a parting line of the paint applied to the surface of a portion C of the object W to be painted, with an automobile bumper shown in FIG. 1 as an object W to be painted. It has a circular assembled part 2 and a membrane part 3 that is fixed to this assembled part 2 and covers the non-painted part M.

The assembly portion 2 and the membrane portion 3 are fixed together by adhesive or heat fusion.

As the material of the assembly part 2 and the membrane part 3 of the painting masking jig 1 shown in FIG. 2, it is possible to use rubber mixtures or synthetic resin mixtures such as natural rubber, polyurethane, polyvinyl chloride, and polyethylene. Furthermore, as the material for the membrane portion 3, it is also possible to use aluminum foil or a rubber mixture or synthetic resin mixture coated with aluminum powder on the surface. When the object W to be coated is a plastic automobile bumper and its base material is a polymer made of a non-polar molecular structure such as a polypropylene mixture, the paint Any material may be used for the masking jig 1. However, when masking an automobile bumper whose base material is a polymer with a polar molecular structure such as polyurethane, nylon, or polybutylene terephthalate, it is necessary to use a polymer with a polar molecular structure such as a soft polyvinyl chloride blend. It is better not to use materials for the masking jig 1 that are made of substances that contain metal.

This is because when the paint dries, the plastic material with a polar molecular structure contained in the material of the masking jig 1 migrates into the material of the automobile bumper, which is the object to be painted, the bumper W.
This is because the surface of the product may be attacked. therefore,
When masking an automobile bumper W containing such a material, it is desirable to use a material that does not contain a plasticizer having a polar molecular structure, such as polyethylene or polypropylene, as the masking jig 1.

Next, such a masking jig 1 for painting is attached to the object W shown in FIG. 1, and the masking jig shown in FIG. The explanation will be based on 1.

As mentioned above, the masking jig 1 shown in FIG. 2 uses, for example, an automobile bumper as shown in FIG. This is to treat this part as the part C to be painted. First, the object W to be coated shown in FIG. 1 is placed on the receiver 12 of the movable cart 11 which is movable by wheels 11a shown in FIG. A detailed cross-sectional view of the object W to be coated at this time is shown in FIG.

Next, as shown in FIG. 5, the assembled portion 2 of the masking jig 1 shown in FIG. 2 is inserted into the groove G of the object W to be coated. At this time, the assembled part 2 is fitted into the groove G by the operator pushing the assembled part 2 with his or her fingers or by pushing a jig having a roller or the like against the assembled part 2. Do the work as follows.

Next, as shown in FIG. 6, the membrane part 3 fixed to the assembled part 2 covers the surface of the non-coated part M of the object W, and the membrane part 3 is attached to the assembled part 2. The opposite end 3a is wrapped around the back side of the object W to be coated, and the end 3a and the object W to be coated are fixed with the adhesive 6.

In that case, the adhesive 6 may be applied in advance to the end 3a of the film part 3 or the object W to be coated, or the surface of the non-painted part M may be covered with the film part 3. After that, an adhesive 6 may be applied between the end 3a of the film portion 3 and the object W to be coated.

Next, in the state shown in FIG. 6, the movable trolley 11 is transported into a painting booth (not shown) and paint is sprayed with a painting gun, and then the movable trolley 11 is transported into a hot air drying oven to prevent the paint from baking. Let's do it. Even if the painting masking jig 1 is exposed to wind during these operations, the coating masking jig will not come off from the workpiece W because the film portion 3 is adhered to the workpiece W by the adhesive 6. When the masking jig 1 for painting is taken out from the object W to be painted after the paint has dried, a sixth parting line is formed on the surface of the object W by the assembly 2, which is the boundary between the surface C to be painted and the non-painted surface M. It is formed accurately and neatly at the position indicated by the symbol P in the figure.

In addition, in the above-mentioned embodiment, the assembled part 2 of the masking jig 1 was simply inserted into the groove G of the object W to be coated, and the assembled part 2 of the masking jig 1 and the object W to be coated were fixed. The present invention is not limited to this in any way, and the following embodiments can be considered.

That is, as shown in FIG. 7, the masking jig 1
Before inserting the assembled part 2 into the groove G of the object W to be coated, the adhesive 6 may be applied and placed in the groove G. As shown in FIG. 8, after inserting the assembled portion 2 of the masking jig 1 into the groove G of the object W to be coated, an adhesive 6 is applied from above the assembled portion 2 to the non-coated area M side near the groove G. may be applied along the longitudinal direction of the assembled portion 2 to adhere the assembled portion 2 and the object W to be coated. Thereafter, similarly to the embodiment described above, as shown in FIG. The end 3a on the opposite side is wrapped around the back side of the object W to be coated, and the end 3a and the object W to be coated are fixed with the adhesive 6.

In the case of such an embodiment, the assembly portion 2 of the masking jig 1 and the object W to be coated are more securely fixed, which is more convenient.

Note that the adhesive 6 includes rubbers, acrylic polymers, and ethylene vinyl acetate polymers (EVAc).
These three types are typical, but when the object W to be coated is an automobile bumper W, rubbers are suitable. Rubber adhesives 6 include polyisoprene with a filler such as clay added, but if the adhesive 6 sticks to the exterior of the object to be coated, bake the paint in a hot air drying oven. Afterwards, when the masking jig 1 for painting is peeled off from the object W to be painted, it is desirable that no adhesive 6 remains on the surface of the object W to be painted. For this purpose, it is preferable to use a mixture containing a crosslinking agent composition as the adhesive 6. As the crosslinking agent composition, crosslinking reactive polymers such as polyisoprene and natural rubber, and crosslinking agents such as tetramethylthiuram disulfide (TMT) and sulfur can be used.

Further, in the above-described embodiment, masking was performed using the assembled portion 2 of the painting masking jig 1 having a solid circular cross-sectional shape, but the present invention is not limited to this in any way. A masking jig 1 for painting having assembled portions 2 having various cross-sectional shapes may be used. The cross-sectional shape of the assembled portion 2 of this painting masking jig 1 is as follows.

The painting masking jig 1 shown in FIGS. 9(A) to (1) is a diagram showing the case where the assembly part 4 is formed by the main body part 4 and the recessed part 5, and the one shown in FIG. 9(A> The main body part 4 is formed to have a substantially triangular cross section, and four triangular parts 5 are formed therein so that the cross-sectional shape of the assembled part 2 can be easily changed.Furthermore, FIG. As shown in (B), the cross-sectional shape of the recess 5 formed in the main body 4 may be square, or as shown in (C) and (D) in the same figure, the recess 5 may be round. As shown in Fig. E), the main body part 4 can be made into a combination of a circle and a square, and the recessed part 5 can be made in a shape similar to that of Fig. 1, or as shown in Fig. 1 (E).
The main body part 4 of the same figure (G) is made into a 111m shape, the main body part 4 and the concave part 5 are made into a square shape as shown in the same figure (H), the main body part 4 is made into a rectangular shape as shown in the same figure (I). As shown in the figure, the main body part 4 and the recessed part 5 can be made into various other shapes, such as a combination of a triangle and a square.

In this way, by making the main body part 4 and the recessed part 5 have various shapes, the assembled part 2 can be elastically deformed so that the cross-sectional shape can be easily changed. Incidentally, in FIG. 9, the imaginary line indicates the assembled portion 2 in a state before being fitted into the groove G.

Painting masking jig 1 shown in Figures 10 (A) to (E)
10A and 10B are diagrams showing the case where the assembled portion 2 is formed of a main body portion 4 and a hollow hole 10, respectively, and the shape of the hollow hole 10 is shown in FIGS.

As shown in (E), a circular hollow hole 10 may be formed, or as shown in (E).
It is possible to use a rectangular shape as shown in C) or a combination of a circle and a rectangle as shown in FIG. Further, as the outer peripheral shape of the main body portion 4 of the assembled portion 2, the first
It is possible to make it circular as shown in Figure 0 (Δ), triangular as shown in Figure 0 (B), or square as shown in Figure 0 (C). Furthermore, various other shapes are possible for the shape of the main body 4 and the hollow hole 10, such as the shape shown in FIG. 10 (D>(E). By making the body portion 4 have various shapes, the cross-sectional shape of the assembled portion 2 can be elastically deformed so that it can be easily changed.

11(△) to Ll) are diagrams showing the shapes of the assembled portions 2 of the other masking jig 1 for painting. It is formed by a protrusion 7 extending along the ridge.

The assembled part 2 shown in FIG. 11(A) has a rectangular main body and a tapered protrusion that rises from the side opposite to the membrane part 3 of the main body 4. This protrusion 7 is inclined with respect to the surface 8 at an angle of slope θ. 11th
The assembly 2 shown in FIG. 2B has protrusions 7 formed on both sides of the main body 4, and each protrusion 7 is inclined at an inclination angle θ. The assembly part 2 shown in FIG. 11(C) is the main body part 4.
are formed into a V-shape, and each protrusion 7 is provided on this main body 4.
By forming this, the assembled portion 2 is made into a W-shape as a whole. The assembled part 2 shown in FIG. 11 (D) has a protrusion 7 formed on one side of the main body part 4 formed in a substantially rectangular shape, and the assembled part 2 shown in FIG. 11 (E) has a rectangular main body part 4. Projections 7 are formed on both sides.
The one shown in Figure (F) has a protrusion 7 with a V-shaped cross section formed on the main body 4 of the assembled part 2, and the V-shaped protrusion 7 can also be formed on both sides of the main body 4. It is possible. Furthermore, the assembly part 2 shown in FIG. 11(G) has a concave part 5 formed in the main body part 4 and a protrusion part 7.
1-1> has a hollow hole 10 formed in the main body 4 and a protrusion 7 formed therein. Also, the first
As shown in FIG. 1(H), the protrusion 7 may be formed by making the cross-sectional shape of the assembled portion 2 star-shaped, and as shown in FIG. 11(1).
As shown in FIG. Part 2
The state before it is fitted into the groove G is shown by phantom lines.

Furthermore, it is also possible to form the assembled portion 2 into a shape in which any one of the recess 5, the hollow hole 10, and the protrusion 7 is combined. The shape of the assembled portion 2 can be selected from various shapes as shown in FIGS. 9 to 11 by taking into consideration various conditions such as the position of the parting line formed in the groove G.

FIGS. 12(A) to 12(E) are diagrams showing still another masking jig 1 for painting, in which the automobile bumper shown in FIG. 12(A) is the object W to be coated, and the grooves G formed therein are A painting masking jig 1 is used to paint only the lower side. The painting masking jig 1 is basically the second
Although it is similar to the one shown in the figure, a large number of slits 9 are formed in the part of the assembled part 2 that corresponds to the corner Q of the object W to be coated and is bent when the assembled part 2 is attached to the groove G. be. The shape of the slit 9 may be a thin cut as shown in Fig. 12 (C), a wide cut as shown in Fig. 12 (D), or a thin and intersecting cut. It is possible to do so. As a result, the assembled portion 2 follows the corner portion Q of the object W to be coated and is easily bent.

Further, in the above embodiment, the assembled portion 2 of the painting masking jig 1 is inserted into the groove G of the object W to be coated, but the present invention is not limited to this in any way, and as shown in FIG. (A
> As shown in (B), the coating masking jig 1 may be attached to a stepped portion of the object W to be coated, or may be attached to a flat portion of the object W to be coated. At that time as well, the object W to be coated is masked in the same manner as in the above embodiment. However, the adhesive 6 is required to fix the assembled portion 2 of the masking jig 1 to the stepped portion or flat portion of the object W to be coated as shown in FIGS. 13 (Δ) and (B).

(Effects of the Invention) As described above, according to the present invention, when painting the to-be-painted part of an object having a non-to-be-painted part and a to-be-painted part, a masking jig for painting is used to In a painting masking method for covering a non-painted part, the coating has a set part forming a parting line for the paint applied to the surface of the part to be painted, and a film part fixed to the set part and covering the non-painted part. After installing the assembled part of the masking jig at the boundary between the non-painted part and the painted part, the non-painted part is covered with the film part, and the non-painted part and the film part are fixed with an adhesive. As a result, a clear and sharp parting line is formed by the assembled part, and the masking jig for painting can be easily and quickly attached to the object to be painted. It goes without saying that the masking jig does not come off the object to be coated at the time of baking or baking, allowing smooth painting work to be performed, and furthermore, when removing the masking jig for painting, the masking jig When the main body is peeled off, the adhesive is also removed, so it has the excellent effect of allowing work to be done easily and quickly.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an automobile bumper as an object to be coated;
FIG. 2 is a perspective view showing a masking jig for painting according to the present invention, FIG. 3 is a perspective view showing the object to be coated shown in FIG. 1 attached to a moving cart, and FIG. 5.6 is a sectional view of a main part similar to FIG. 4 showing one process according to the present invention, and FIGS. 7 and 8 are sectional views taken along the line IV-■, and FIGS. 7 and 8 show other embodiments according to the present invention. Main part sectional view, Figures 9(A) to (I), 10th
Figures (A) to (E) and Figures 11 (A) to (J) are cross-sectional views of main parts of the masking jig for painting used in the present invention. Figure 12 (
A> is a perspective view (not showing) of an automobile bumper as an object to be coated according to another embodiment of the present invention, FIG. 12(B) is a cross-sectional view of FIG. E) is the same figure (A)
13(A) and 13(B) are sectional views of essential parts of a painting masking jig according to another embodiment of the present invention. It is. 1... Masking jig for painting, 2... Assembling part, 3a.
... End, 3... Membrane, 4... Main body, 6... Adhesive, 7... Protrusion, W... Object to be coated, M... Non-coated part, C ...Part to be painted, G...Groove. Figure 9 (A) (Bn (C) (C) (D) (E) Figure 13 (A) (B)

Claims (1)

[Claims] (1) In a painting masking method for coating the non-painted part using a painting masking jig when painting the painted part of an object having a non-painted part and a painted part, the painting masking method comprises: The assembled part of a masking jig for painting has a film part that is fixed to the assembled part and covers the non-painted part, such as an assembled part that forms a parting line for the paint to be applied to the surface of the painted part. A masking method for painting, which comprises: installing the membrane part at the boundary between the film part and the part to be painted, covering the non-painting part with the film part, and fixing the non-painting part and the film part with an adhesive. (2) The masking method for painting according to claim 1, wherein the adhesive comprises a mixture containing a crosslinking agent composition.