JPH0612874Y2 - 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.

[Prior Art] Conventionally, as a masking material of this type, as shown in FIG. 12, a panel-shaped main body made of a thermoplastic foam.
(3) A structure in which an adhesive layer (3) B is provided on one surface of A is provided. The masking material (3) having such a structure is adhered via the adhesive layer (3) B to the surface (2) of a member such as an automobile floor panel (1) which should not be surface-treated. After that, apply surface treatment such as painting. Thus, as shown in FIG. 13, for example, in the case of painting, 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.
Thereafter, for example, the masking material (3) is softened and deformed by heating in a coating baking step or the like to shrink 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, the main body (3) A of the masking material (3) is used.
Since the adhesive layer (3) B is provided on the entire surface of the mask, the adhesive force to the surface (2) is large, and when the masking material (3) is softened and deformed by heating and contracted to be naturally released by its own weight,
The adhesive force of the adhesive layer (3) B hindered smooth desorption, and the melted material of the masking material (3) might remain on the surface (2).

Further, the coating film (4) is continuously formed from the surface (2) to the masking material (3), and in order for the melt of the masking material (3) to spontaneously desorb, it must break through the coating film (4). I have to.
Therefore, if the coating film (4) is difficult to tear, masking material
The spontaneous desorption of the melt of (3) is hindered.

[Means for solving problems]

As a means for solving the above problems, the present invention provides a container-shaped main body (31) A made of a thermoplastic foam, and a peripheral wall portion (31) G of the main body (31) A, which is extended outward from the upper edge. The upper flange portion (31) B formed, the outer wall portion (31) C hanging from the peripheral edge of the upper flange portion (31) B, and the lower collar portion (outwardly extended from the lower edge of the outer wall portion (31) C ( 31) D and an adhesive layer (31) E formed on the upper surface of the upper collar portion (31) B, and by the main body (31) A peripheral wall portion (31) G and the outer wall portion (31) C. The masking material (31) in which the defined space (31) H exists is provided.

[Action]

The masking material (31) of the present invention is a member through the adhesive layer (31) E.
It is affixed to the surface (2) which should not be subjected to the surface treatment of (1), and covers the surface (2) to protect it from the surface treatment.

When the surface treatment is applied in this state, the surface treatment film (4) becomes the member (1).
The surface treatment film (4) is not formed on the surface (2) which should not be subjected to the surface treatment, and the surface treatment film (4) is covered with the masking material (31) by the shielding action of the lower collar portion (31) D of the masking material (31). ) It is interrupted in the surroundings. After the surface treatment, when heated above the softening point of the thermoplastic foam forming the masking material (31), the thermoplastic forming the masking material (31) is softened, and air or air contained in the foam structure is removed. First, the masking material (31) is expanded by the foaming gas residue, and the upper brim portion
Below the (31) B, the peripheral wall (31) G and the outer wall (3) of the main body (31) A are provided.
1) Since there is a space (31) H defined by C, the upper collar portion (31) B is expanded by such expansion.
1) H is warped in a direction in which it narrows, that is, the side opposite to the adhesive layer (31) E, whereby the adhesive layer (31) E is peeled off. Next, when air or foaming gas residue escapes from the foam structure, the masking material (31) contracts and spontaneously desorbs due to its own weight. At this time, the adhesive layer (31) E of the masking material (31) is present only on the upper collar portion (31) B, and as described above, the surface (2) is peeled off due to the warping of the upper collar portion (31) B. Since the surface treatment film (4) is interrupted around the masking material (31), the masking material (31)
The adhesive layer (31) E and the surface-treated film (4) hardly interfere with the softening shrinkage and spontaneous detachment of the. Moreover, the ratio of the thermoplastic to the apparent volume of the masking material is much smaller than that of the panel-shaped one (in the panel-shaped one, the actual volume of the thermoplastic foam and the apparent volume of the masking material are equal). Therefore, the masking material (31) of the present invention has a greatly improved shrinkage rate as compared with the conventional panel-shaped masking material. Therefore, the shrinkage force of the masking material (31) at the time of heating also increases, and the masking material (31) easily spontaneously desorbs.

[Effect of device]

Therefore, in the present invention, the masking material is hardly fused to the covered portion, and is smoothly and automatically separated by heating. 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 an embodiment shown in FIGS. 1 to 5, in which a masking material 31 has a rectangular container-shaped main body 31A.
An upper collar portion (31) B extended outward from an upper edge of the peripheral wall portion (31) G of the main body (31) A, and an outer wall portion (31) C hanging from a peripheral edge of the upper collar portion (31) B. The outer wall portion (31) C, the lower flange portion (31) D extended outward from the lower edge, and the adhesive layer (31) E formed on the upper surface of the upper collar portion (31) B. A space (31) H is defined by the peripheral wall portion (31) G of (31) A and the outer wall portion (31) C, and the adhesive layer (31) E is covered with a release paper (31) F. It

The masking material (31) is formed by removing the release paper (31) F from the upper flange portion.
(31) B After being adhered to the surface (2) which should not be subjected to the surface treatment of a member such as an automobile floor panel (1) through the adhesive layer (31) E on the upper surface, FIG. As shown in, for example, coating film that has been subjected to surface treatment such as polyvinyl chloride sol coating
Form (4). However, since the surface (2) of the floor panel (1) is covered with the masking material (31), the coating film (4)
Is not formed, and the periphery of the masking material (31) is interrupted by the shielding action of the lower collar portion (31) D of the masking material (31). After the coating is finished, the masking seat (31) is softened by heating in a coating baking process or the like, and the masking material (31) is caused by the air or foaming gas residue contained in the foamed structure in the masking material (31). First expands, and the peripheral wall portion (31) G and the outer wall portion (31) of the main body (31) A are formed below the upper brim portion (31) B of the masking material (31) as described above.
Since there is a space (31) H defined by C and C, as shown in FIG. 3, the upper collar portion (31) B has a direction in which the space (31) H narrows, that is, the adhesive layer (31) E. Curving to the other side,
The adhesive layer (31) E formed there is peeled from the surface (2). Then, when the air or foaming gas residue contained in the foam structure escapes, the masking material (31) contracts and is detached from the surface (2) as shown in FIG.

The masking material (31) may be used so as to cover the protrusion (2) A on the surface (2) of the floor panel (1) as shown in FIG. In this case, the protrusion (2) A is a masking material (3
Protected by the container-shaped body (31) A of 1), no surface treatment is applied.

6 to 9 show another embodiment of the present invention. In the figure, the masking material (32) is a cylindrical container-shaped body (32) A.
An upper collar portion (32) B extended outward from the upper edge of the peripheral wall portion (32) G of the main body (32) A, and an outer wall portion (32) hanging from the peripheral edge of the upper collar portion (32) B. ) C, a lower collar portion (32) D extended outward from a lower edge of the outer wall portion (32) C, an outer peripheral wall portion (32) I rising from a peripheral edge of the lower collar portion (32) D, A peripheral wall portion (32) of the main body (32) A, which comprises an adhesive layer (32) E formed on the upper surface of the upper collar portion (32) B.
A space (32) H is defined by G and the outer wall portion (32) C, and the adhesive layer (32) E is covered with a release paper (32) F.

The masking material (32) is formed by removing the release paper (32) F from the upper flange portion.
(32) B is attached, for example, around the hole (21) of the floor panel (1) of the automobile through the adhesive layer (32) E on the upper surface, and then coated with, for example, polyvinyl chloride sol as shown in FIG. To form a coating film (4). In this case, the coating film (4) is the masking material (32)
The lower brim portion (32) D and the outer peripheral wall portion (32) I are formed in a discontinuous state around the masking material (32) as shown by an arrow A in FIG. Therefore, the masking material (32) is heated to soften it, and as shown in FIG.
The (32) B is bent back in the direction in which the space (32) H is narrowed, that is, in the side opposite to the adhesive layer (32) E, and the adhesive layer (32) E is peeled off from the periphery of the hole (21). As shown in FIG. 9, when contracted, the adhesive layer (32) E and the coating film (4) do not interfere with each other and the masking material (32) can be easily removed.

In the case of this embodiment, the inside of the hole (21) of the floor panel (1) and the hole
The periphery of (21) is protected from painting, but the hole (21) has bolts (5) for attaching parts as shown in FIG. 10, for example.
Axis (5) B of is passed through. The head (5) A of the bolt (5) is a coating film
Floor panel (1) around hole (21) where (4) is not present
Since it comes into direct contact with, the bolt (5) will not be loosened.

The masking material of the present invention is made of a thermoplastic plastic foam such as polystyrene, polyethylene, polypropylene, etc., and is formed by a well-known method such as vacuum forming or injection molding a sheet of the thermoplastic plastic foam, or the thermoplastic material. It is manufactured by bead molding using plastic expandable beads. 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, gypsum, talc, clay, asbestos, mica, glass fiber, calcium silicate, bentonite, white carbon, carbon black, iron powder, aluminum powder,
One or more inorganic fillers such as stone powder, blast furnace slag and fly ash, and fillers such as wood powder, coconut powder, walnut powder, starch, cotton fiber powder and wheat flour may be mixed. In the case of the embodiment shown in FIGS. 1 to 4, it is desirable to arrange a plurality of masking materials (31) vertically and horizontally and integrally vacuum-form as shown in FIG. 11, for example. In this case, the lower brim portion (31) D of the masking material (31) is provided with a notch or a groove (31) I on one surface or both surfaces thereof so that the individual masking material (31) can be easily torn off by hand. Notch or groove in the lower collar portion (31) D
The (31) I may be integrally formed at the time of vacuum forming the masking material (31), or may be separately formed after the vacuum forming.
Also, in the case of the embodiment shown in FIGS. 6 to 9, bead molding is also suitable.

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. In this case, if the masking material is made of a hard and brittle plastic foam, holes can be easily opened with a finger, and the workability of detachment is improved.

The masking material of the present invention may be color coded according to where the coating of the member should not be applied.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention,
1 is a perspective view, FIG. 2 is a sectional view in a masking state, and FIG.
FIG. 4 is a sectional view of the masking material in a heat deformed state, FIG. 4 is a sectional view of the masking material detached state, FIG. 5 is another sectional view of the masking state, and FIGS. 6 to 9 show another embodiment of the present invention. FIG. 6 is a perspective view, FIG. 7 is a sectional view of a masking state, FIG. 8 is a sectional view of a masking material in a thermal deformation state, FIG. 9 is a sectional view of a masking material detached state, and FIG. 10 is a bolt insertion state sectional view. 11 and 12 are manufacturing state diagrams of the first embodiment, and FIG.
FIGS. 1 to 14 show a conventional example. FIG. 12 is a perspective view of a masking state, FIG. 13 is a sectional view of a masking state, and FIG. 14 is a sectional view of a detached state. In the figure, (31), (32) ... masking material, (31) A, (32) A ... main body, (31) B, (32) B ... upper collar part (31) C, (32) C ... Outer wall part (31) D, (32) D ... Lower collar part (31) E, (32) E ... Adhesive layer (31) G, (32) G ... Peripheral wall part (31) H, (32) H ... space

Claims (1)

[Scope of utility model registration request] 1. A container-shaped main body made of a thermoplastic foam material, an upper collar portion extended outward from an upper edge of the peripheral wall portion of the main body, an outer wall portion hanging down from a peripheral edge of the upper collar portion, and the outer wall. It is characterized by comprising a lower collar portion extended outward from the lower edge of the portion and an adhesive layer formed on the upper surface of the upper collar portion, and having a space defined by the main body peripheral wall portion and the outer wall portion. Masking material