JPH0612876Y2 - Masking material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention protects the surface of a member which should not be subjected to the surface treatment from the surface treatment during the surface treatment such as painting, plating and vapor deposition. It relates to a masking material used in.

[Conventional technology]

Conventionally, as this type of masking material, there has been provided a structure in which an adhesive layer (3) B is provided on one surface of a panel-shaped main body (3) A made of a plastic foam as shown in FIG. The masking material (3) having such a structure is adhered to the surface (2) of the member, such as an automobile floor panel (1), which should not be surface-treated, through the adhesive layer (3) B. After that, apply surface treatment such as painting. Thus, as shown in FIG. 9, for example, in the case of coating, a coating film (4) is formed, but since the predetermined surface (2) of the floor panel (1) is covered with the masking material (3), the coating film (4) is formed. (4) is not formed. After that, the masking material (3) is softened and shrunk by heating, for example, in a coating and baking step, and the masking material (3) is naturally detached by its own weight as shown in FIG.

[Problems to be solved by the invention]

In the above conventional technique, after the surface treatment, the masking material (3)
Masking material when softening and shrinking to allow natural desorption
It is necessary to break through the surface-treated film (4) covering (3), but a surface-treated film such as a coating film having a relatively high strength is difficult to break through, which is a serious obstacle to the natural detachment of the masking material.

[Means for solving problems]

As a means for solving the above-mentioned conventional problems, the present invention comprises a container-shaped body (31) A, (32) A, (33) A made of thermoplastic foam and having an open top and a bottom. Flange (31) B, (32) B, (33) B extending outward from the upper edge of the container-shaped body (31) A, (32) A, (33) A and the lower surface of the body The pressure-sensitive adhesive layers (31) C, (32) C, (33) C formed, and the lower surface of the masking materials (31), (32), (33) having a planar shape corresponding to the protected surface. It is provided.

[Action]

The masking material (31) of the present invention is attached via the adhesive layer (31) C to the surface (2) (protected surface) of the member (1) which should not be surface-treated. Since the lower surface of the main body (31) A of the masking material (31) has a planar shape that matches the protected surface (2),
The masking material (31) completely covers the protected surface (2) and protects it from surface treatment. The surface treatment film (4) formed during the surface treatment is a masking material around the masking material (31).
It is interrupted by a flange (31) B extending outward from the upper edge of the container-shaped body (31) A of (31). When the thermoplastic foam forming the masking material (31) is softened by heating after the surface treatment, the gas contained in the bubbles of the thermoplastic foam expands, breaks the bubbles and escapes to the outside. Therefore, the masking material (31) contracts remarkably. Since the surface treatment film is interrupted around the masking material (31) as described above, the shrinkage of the masking material (31) is not interfered with by the surface treatment film, and the softened masking material (31) initially shrinks. The main body (3
1) The pressure-sensitive adhesive layer (31) C is first warped to the upper surface side of the opening of A to be peeled off from the protected surface (2), and then it is contracted remarkably so that the masking material (31) is naturally released by its own weight. Let go.

The shrinkage factor of the masking material of the present invention is represented by the following equation in the case of a thermoplastic foam having an expansion ratio X.

Here V is in apparent volume V ₁ of the masking material is thermoplastic volume of plastic [Effect of invention] Accordingly, the present invention of the masking material to soften shrunk by heating after the surface treatment, and covers the masking material Since the surface-treated film is intermittent around the masking material and the pressure-sensitive adhesive layer is peeled off, and the masking material has a large shrinkage ratio, it can be surely released naturally.
Further, since the masking material of the present invention is in the shape of a container, the material cost is greatly reduced as compared with the case of a panel-shaped masking material.

〔Example〕

The present invention will be described with reference to a first embodiment shown in FIGS. 1 to 4. The masking material (31) has a rectangular box-shaped main body (31) A having an open top surface and a bottom surface, and the main body (31). 31) A is composed of a flange (31) B extending outward from the upper edge and an adhesive layer (31) C formed on the lower surface of the main body (31) A, the lower surface of which is a rectangular shape matching the protected surface. The pressure-sensitive adhesive layer, which has a planar shape.
(31) C is covered with release paper (31) D.

The masking material (31) peels off the release paper (31) D, and the surface of a member such as an automobile floor panel (1) which should not be subjected to surface treatment via the adhesive layer (31) C ( 2) After being attached to the (protected surface), a coating film (4) is formed by surface treatment such as painting as shown in FIG. The protected surface
Since the (2) has a planar shape that matches the rectangular planar shape of the lower surface of the masking material (31), the floor panel (1)
The surface to be protected is completely covered with the masking material (31) and the coating film (4) is not formed. In this case, the coating film (4) is formed by the flange (31) B extending outward from the upper edge of the main body (31) A of the masking material (31) as shown in FIGS. It is formed in an interrupted state at (31). Therefore, when the masking material (31) is softened and shrunk by heating, for example, in the coating baking process after the coating is completed, the masking material (31) is first applied to the upper surface side of the opening of the main body (31) A at the initial contraction as shown in FIG. The adhesive layer (31) C warps back and peels off from the protected surface (2), and then the masking material (31) undergoes a significant shrinkage, and as shown in FIG. To detach. The shrinking of the masking material (31) is performed without any interference with the coating film (4).

FIG. 5 shows a second embodiment of the present invention. The masking material (32) of the present embodiment has a rectangular box-shaped main body (32) A having an open upper surface and a bottom surface, and the main body (32). ) A flange (32) B extending outward from the upper edge, a peripheral wall (32) B'standing from the peripheral edge of the flange (32) B, and an adhesive layer formed on the lower surface of the main body (32) A (32) C, the lower surface of which has a rectangular planar shape that matches the surface to be protected, and the adhesive layer (32) C
Is covered with a release paper (32) D. In this embodiment, the peripheral wall (32) B 'standing upright from the flange (32) B prevents the surface treatment film from entering the inside of the masking material (32).

FIG. 6 shows a third embodiment of the present invention. In the masking material (33) of the present invention, the main body (33) A has a cylindrical container shape having an open upper surface and a lower surface. A flange (33) B extends outward from the upper edge of the main body (33) A, and a vertical wall (33) B 'vertically extends around the periphery of the flange (33) B. An adhesive layer (33) C is formed on the underside, and the lower surface has a circular planar shape that matches the protected surface. The adhesive layer (33) C is covered with a release paper (33) D. It is forced.

In this embodiment, the vertical wall (33) B 'of the flange (33) B ensures the intermittent operation of the surface treatment film around the masking material (33).

Naturally, other than the above embodiments, the masking material of the present invention may have various shapes depending on the shape of the surface to which the surface treatment should not be applied.

The masking material of the present invention is made of thermoplastic plastic foam such as polystyrene, polyethylene, polypropylene, etc., for example, vacuum molding or injection molding of the thermoplastic foam sheet, or expandable beads of the thermoplastic plastic. It is manufactured by bead molding using. The thermoplastic foam includes calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfite, magnesium hydroxide, aluminum hydroxide, magnesium oxide, titanium oxide, iron oxide, zinc oxide, alumina, silica, diatomaceous earth, dolomite, plaster,
Inorganic filler such as talc, clay, asbestos, mica, glass fiber, calcium silicate, bentonite, white carbon, carbon black, iron powder, aluminum powder, stone powder, blast furnace slag, fly ash, wood powder, coconut powder, walnut powder One or more fillers such as starch, cotton fiber powder, and wheat flour may be mixed. In the case of the first embodiment shown in FIGS. 1 to 4, it is desirable that a plurality of masking materials (31) are arranged vertically and horizontally and integrally vacuum-formed as shown in FIG. 7, for example. In this case, masking material (3
Cut or groove on one or both sides of flange (31) B of 1)
(31) E is provided so that the individual masking materials (31) can be easily torn off by hand. Notch or groove (31) E in the flange (31) B
May be integrally formed during vacuum forming of the masking material (31), or may be separately formed after vacuum forming.

In addition, the masking material of the present invention may be color-coded according to the place where the surface treatment of the member should not be performed. Further, other than this embodiment, when removing the masking material of the present invention, a hand key or the like may be used without melting it.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is a perspective view, FIG. 2 is a sectional view in a masking state,
FIG. 3 is a sectional view of the masking material in a warped state, FIG. 4 is a sectional view of the detached state, FIG. 5 is a perspective view of the second embodiment, FIG. 6 is a perspective view of the third embodiment, and FIG. The manufacturing state diagram of the embodiment and FIGS. 8 to 10 show the conventional example.
Figure is a perspective view of the masked state, Figure 9 is a sectional view of the painted state,
FIG. 10 is a sectional view in a detached state. In the figure, (31), (32), (33) ... masking material, (31) A, (32) A, (33) A ... main body, (31) B, (32) B, (33) B: Flange, (31) C, (32) C, (33) C ... Adhesive layer

Claims (1)

[Scope of utility model registration request] 1. A container-shaped body made of a thermoplastic plastics foam, the upper surface of which is open and the lower surface of which is bottomed, a flange which extends outward from an upper edge of the container-shaped body, and a bottom surface of the lower surface of the body. A masking material comprising a formed pressure-sensitive adhesive layer, the lower surface of which has a planar shape corresponding to the surface to be protected.