JPS60251965A - Masking method used in painting - Google Patents

Abstract

PURPOSE:To facilitate work for obtaining an accurate parting line, by arranging the string part of a masking jig to the boundary between a part to be painted and a non-painting part and, thereafter, applying an adhesive to the region close to an article to be painted while covering the non-painting part with a film part. CONSTITUTION:The string part 2 of a masking jig 1 is inserted into the groove G of an article W to be painted. Next, a sticking agent 6 is applied to the string part, which is in the vicinity of the groove G being the approach region of the string part 2 and the article W to be painted and positioned in the side of a non- painting part M from above along the longitudinal direction of the string part 2 to stick the string part 2 and the article W to be painted. Further, the surface of the non-painting part M of the article W to be painted is covered by the film part 3 secured to the string part 2 and the other side part of the film part 3 is involved in the rear surface side of the article W to be painted to perform painting.

Description

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

(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 has been proposed by the applicant.

When this masking jig for painting is attached to an object to be painted and painted, an adhesive is applied to the assembled parts of the masking jig to prevent the masking jig from coming off the object. ing. However, if adhesive is applied to the assembled parts of this masking jig for painting, it may be difficult to pack the masking jig.

For transportation, etc., a coating material is required to cover the adhesive material, and in addition to the manufacturing cost of attaching this coating material, packaging,
When transporting, storing, etc., care must be taken not to peel off the coating material, and it is also necessary to maintain good storage conditions so as not to deteriorate the adhesive.

(Object of the invention) The present invention enables a masking jig to be easily and quickly attached to an object to be coated, and furthermore, the parting line forming the boundary between the surface of the unpainted part of the object to be coated and the surface of the part to be coated is provided. It is possible to form the masking jig accurately, and also to securely fix the masking jig so that it does not come off from the object to be coated due to the pressure of hot air during spraying or baking of the paint during painting. In addition to manufacturing the masking jig,
The purpose is to simplify storage and handling.

(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 painting masking method for coating a non-painted area, which includes 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, an adhesive is applied to the area adjacent to the assembled part and the object to be painted, and the assembled part and the painted part are separated. This is a masking method for painting, characterized in that the coating material is adhered to an object, and the non-painted portion is covered with the film portion.

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

FIGS. 1A to 1C each show 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. Figure 1 (A) ~
The automobile bumpers shown in (C) are each molded from synthetic resin.

The automobile bumper W shown in FIG. 1(A) has a groove G formed along the longitudinal direction in the central part of its surface, and it is possible to paint only the lower side around this groove G, or paint the upper side and the other side. The underside and the underside are painted using different paints with different colors. The automobile bumper W shown in FIG. 1(B) has two parallel grooves G formed in the center of its surface, and, for example, the upper and lower sides other than the areas between the grooves G are painted. It is done. The automobile bumper W shown in FIG. 1(C) has loop-shaped grooves G formed at both end corners of its surface, and the parts other than those surrounded by these loop-shaped grooves G are painted. will be carried out.

Figure 2 (A) shows a case where, of the object W shown in Figure 1 (A>), for example, the upper side of the groove G is the unpainted part M, and only the lower part C is to be painted. FIG. 2B is a diagram showing a masking jig 1 used for the masking jig 1.Furthermore, FIG. 2B shows a portion of the object W shown in FIG. 2(C) is a diagram showing a masking jig 1 used when painting only a portion C other than the portion M to be painted; FIG. It is a figure which shows the masking jig 1 for coating used when coating only the non-coating part C of the coating material W surrounded by the groove|channel G formed in the loop shape.

Each masking jig 1 for painting is shown in Fig. 2 (A) ~
As shown in (C), an automobile bumper is used as the object W to be coated,
It has a set part 2 having a solid circular cross section forming a parting line of the paint applied to the surface of the part to be painted C, and a membrane part 3 fixed to this set part 2 and covering the non-painted part M. This assembly part 2 and membrane part 3
The fixing is done by adhesive or heat fusion.

The material of the assembly part 2 and membrane part 3 of the painting masking jig 1 shown in FIGS. 2(A) to (C) may be a rubber mixture or a synthetic resin mixture such as natural rubber, polyurethane, polyvinyl chloride, or polyethylene. It is also possible to use aluminum foil as the material for the membrane portion 3, or it is also possible to use a rubber mixture or a synthetic resin mixture coated with aluminum powder on the surface. When the object W to be coated is an automobile bumper made of Plus Deck, and the material is a polymer having a non-polar molecular structure such as a polypropylene blend, as the base material,
Any material may be used for the masking jig 1 for painting. 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 containing materials.

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

As described above, the masking jig 1 shown in FIG. 2(A) uses, for example, an automobile bumper as shown in FIG. This is to treat only the lower part as the part C to be painted. First, as shown in Figure 3, wheel 1
An object W to be coated, not shown in FIG. 1 (△), is placed on the receiver 12 of the movable cart 11 which is movable by means 1a. 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, in the groove G of the object W to be coated,
Insert the assembly part 2 of the masking jig 1 shown in Δ). At that time, the worker may push the assembly part 2 with his/her fingers, or
Alternatively, the assembled portion 2 is fitted into the groove G by pressing a jig having a roller or the like against the assembled portion 2.

Next, as shown in FIG. 6, the assembly portion 2 and the object W to be coated are
Adhesive 6 is applied along the longitudinal direction of the assembled portion 2 to the non-coated portion M side near the groove G, which is the adjacent portion of do.

Furthermore, as shown in FIG. 7, the membrane part 3 fixed to the assembled part 2 covers the surface of the non-coated part M of the object W to be coated, and the membrane part 3 is located opposite to the assembled part 2. The side portion 3a of the side is wrapped around the back side of the object W to be coated. In this state, the movable trolley 11 is transported into a painting booth (not shown) and paint is sprayed by a painting gun, and then the movable trolley 11 is transported into a hot air drying oven to bake the paint. Even if the painting masking jig 1 is exposed to wind during these operations, since the assembled part 2 is adhered to the object W to be coated by the adhesive 6, the masking jig 1 for painting will not come off from the object W to be coated. When the masking jig 1 for painting is taken out from the object W to be painted after the paint has dried, a parting line is formed on the surface of the object W by the assembly 2 as a boundary between the surface C to be painted and the non-painted surface M as shown in FIG. The sign P
It will be formed accurately and neatly at the position shown in .

Furthermore, as described above, in the present invention, the adhesive is applied after the painting masking jig is attached to the object to be coated, so it is not necessary to apply the adhesive to the painting masking jig in advance. Therefore, the manufacturing, storage, and handling of the coating masking jig is extremely simple.

The above-described masking method for painting has been explained using the masking jig 1 for painting shown in FIG.
When the painting masking jig 1 shown in B) and (C) is used, the object to be painted is masked in a similar process.

Note that the adhesive 6 includes rubbers, acrylic polymers, and ethylene vinyl acetate polymers ([VAc).
Although three edges are typical, when an automobile bumper W is the object W to be coated, rubber is suitable. The rubber adhesive 6 is made of polyisoprene with a filler such as clay added, but when the coating masking jig 1 is peeled off from the object W after baking the paint in a hot air drying oven. In addition, it is desirable that no adhesive 6 remains on the surface of the object W to be coated. 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.

In the embodiment described above, the assembly part 2 of the masking jig 1 for painting
Although masking was carried out using a tool with a solid circular cross-sectional shape, the present invention is not limited to this in any way. May be used. This painting masking jig 1
The cross-sectional shape of the assembled portion 2 is as follows.

As shown in FIG. 8(A), the main body part 4 of the assembled part 2 is formed to have a substantially triangular cross section, and a triangular recess 5 is formed therein, so that the cross-sectional shape of the assembled part 2 can be easily deformed. It may also be made to be elastically deformable. Also, Figure 8 (B
), the four parts 5 formed on the main body 4 may be circular, the main body 4 may have a deformed round shape as shown in FIG. The part 4 may be made into a square and the recessed part 5 may be made into a square, or the main body part 4 may be made into a combination of a circle and a square as shown in FIG. As shown in FIG. ), the outer periphery of the main body 4 can be approximately oval, and the concave portion can be shaped like a daruma, or in other various shapes.

In this way, by making the main body part 4 and the recessed part 5 have various shapes, the assembled part 2 can be made elastically deformable so that the cross-sectional shape can be easily changed. Incidentally, in FIG. 8, the imaginary line shows the assembled portion 2 in a state before being fitted into the groove G.

The masking jig 1 for painting shown in FIGS. 9(A) to 9(E) is a diagram showing the case where the assembled portion 2 is formed by the main body portion 4 and the hollow hole 10, and the shape of the hollow hole 10 is as follows. ,
As shown in Figure 9 (A>(B)(E)), the circular hollow hole 1
It can be set to 0, or it can be set to a rectangle as shown in FIG. Further, the outer circumferential shape of the main body part 4 of the assembled part 2 may be circular as shown in FIG. 9(A), or may be circular as shown in FIG.
It is possible to have a triangular shape as shown in (C) or a quadrilateral as shown in (C) of the same figure. Further, the main body portion 4 and the hollow hole 10 may have various shapes such as those shown in FIGS. 9(D) and 9(E). In this way, by making the shapes of the hollow hole 10 and the shape of the main body part 4 various, it becomes possible to make the cross-sectional shape of the assembled part 2 elastically deformable so that it can be easily deformed.

10(A) to (J) are diagrams showing the shapes of the assembled portions 2 of another masking jig 1 for painting, and the assembled portions 2 are respectively protruded from the main body portion 4 and the outer surface of this main body portion 4 and extend in the longitudinal direction. It is formed by a protrusion 7 extending along the ridge.

The assembly part 2 shown in FIG. 10(A) has a rectangular main body part and a tapered protrusion part 7 rising from the side opposite to the membrane part 3 of the main body part 4. The projection 7 is inclined with respect to the surface 8 at an angle of θ. 1st
The assembly 2 shown in FIG. 0(B) has protrusions 7 formed on both sides of the main body 4, and each protrusion 7 is inclined at an inclination angle θ. The assembled part 2 shown in FIG. 10(C) has a main body 4 formed in a letter shape, and a protrusion 7 on each of the 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. 10(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. 10(E) has a main body part 4 formed in a substantially rectangular shape. Projections 7 are formed on both sides. Also, the 10th
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 assembled part 2 shown in FIG. 10(G) has a concave part 5 formed in the main body part 4 and a protrusion part 7.
The assembled part 2 shown in H) has a hollow hole 10 formed in the main body part 4 and a projection part 7 formed therein. Further, as shown in FIG. 10(I), the protrusion 7 may be formed by making the cross-sectional shape of the assembled portion 2 star-shaped, and as shown in FIG. Various other shapes are possible, such as forming a large number of protrusions 7 by providing an arc-shaped recess on the outer peripheral surface. In addition, in FIGS. 9 and 10, the state before the assembled portion 2 is fitted into the groove G is shown by imaginary lines. Furthermore, it is also possible to form the assembled part 2 into a shape in which any of the four parts 5, the hollow hole 10, and the projection part 7 are combined. The shape of the assembled portion 2 can be selected from various shapes as shown in FIGS. 8 to 10 by taking into account various conditions such as the position of the parting line formed in the groove G.

FIGS. 11(A) to 11(E) are diagrams showing still another masking jig 1 for painting, in which the automobile bumper shown in FIG. 11(A) is used as 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
It is similar to the one shown in Figure (A), but the assembled part 2 corresponds to the corner Q of the object W to be coated, and the assembled part 2 is attached to the groove G. 9 is formed. The shape of the slit 9 may be a thin cut as shown in FIG. 11 (C), a wide cut as shown in FIG. 11 (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. It goes without saying that the slits 9 can also be formed in the assembled portion 2 when used for the objects W shown in FIGS. 1(A) to 1(C).

Also, 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. Figure 12 (
As shown in A>(B), masking jig 1 for painting
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.

(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 A painting masking method for coating a non-painted area, which includes 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, an adhesive is applied to the area adjacent to the assembled part and the object to be painted, and the assembled part and the painted part are bonded together. Since the coating is adhered to the coating and the non-coating area is covered by the film, the masking jig for painting can be easily and quickly attached to the coating, and the masking jig can be easily and quickly attached to the coating under the masked condition. When spraying or baking, the masking jig does not come off from the object to be coated, and by working together with the adhesive, it is clearer and more visible on the assembled parts! - Sharp parting lines are formed, allowing smooth painting work, and manufacturing of masking jigs for painting.
It has the excellent effect of simplifying storage and handling.

[Brief explanation of drawings]

FIGS. 1(A) to (C) are perspective views showing an automobile bumper as an object to be coated, FIGS. 2(A) to (C) are perspective views showing a masking jig for painting according to the present invention, and FIG. 1 is a perspective view showing a state in which the object to be coated shown in FIG. 1 is attached to a movable trolley, FIG.
Figure 6.7 is a sectional view of the main parts similar to Figure 4 showing one process according to the present invention, Figures 8 (Δ) to (H), and Figures 9 (A) to (E).
), FIGS. 10(A) to (J) are sectional views of main parts of a masking jig for painting used in the present invention, and FIG. 11 (A> is a cross-sectional view of a main part of a painting masking jig used in the present invention A perspective view showing an automobile bumper, FIG. 11 (B) is a cross-sectional view in the same figure (A>, and FIGS. 11 (C) to (E) are masking for painting to be attached to the bumper shown in the same figure (A>) FIG. 12 is a perspective view showing the main parts of the jig, and FIG. 12 is a sectional view of the main parts of a masking jig for painting according to another embodiment of the present invention. 1... Masking jig for painting, 2... Kumibu, 3...
・Membrane part, 4...Main part, 6...Adhesive, 7...Protrusion, W...Object to be coated, M...Unpainted part, C...Part to be painted, G ···groove. Figure 1 M Figure 9 (A) (B) (C) (D) (E) (C) (D) (E) Figure 12 (A) (B)

Claims (1)

[Claims] 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 painted part The assembled part of the masking jig for painting has a assembled part that forms a parting line for paint to be applied to the surface of the painted part, and a film part that is fixed to the assembled part and covers the non-painted part. After installing it at the boundary between the assembled part and the object to be coated, an adhesive is applied to the area adjacent to the assembled part and the object to be coated, so that the assembled section and the object to be coated are adhered, and the said membrane part is attached to the object to be painted. A masking method for painting characterized by covering.