JP3007189B2 - How to apply hot melt adhesive to groove - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a hot-melt type adhesive to an adherend such as a mold pad in an adhesive sheet. The present invention relates to a method for applying an adhesive.

[0002]

2. Description of the Related Art Conventionally, a so-called "hot melt type adhesive" has been generally used as an adhesive for bonding a sheet cover to a mold pad, for example, to obtain an adhesive sheet.

[0003] The hot-melt type adhesive (hereinafter simply referred to as "adhesive") is based on a thermoplastic polymer resin and is solid at ordinary temperature, but melts and becomes liquid when heated. For example, in the manufacturing process of the above-mentioned adhesive sheet, the adhesive is usually stored in a predetermined spraying device (hot melt applicator) S while being heated and melted as shown in FIG. Is applied to the application surface of the adherend (mold pad M) by spraying.

[0004] The adhesive 1 applied in this manner adheres to the mold pad, is rapidly cooled, and solidifies in a film form on the surface of the mold pad M. When a heated sheet cover (not shown) is pressed against the solidified adhesive film, the adhesive 1 is melted again, so-called "wetting" occurs between the adhesive 1 and the sheet cover, and an adhesive force is generated. The sheet cover is adhered to the mold pad M by maintaining the pressed state and cooling again.

[0005]

However, the above conventional coating method has the following problems. That is,
In general, the mold pad M has a groove 2 for drawing a seat cover to form a linear design groove on the seat surface, and the groove 2 is relatively deep and narrow. Is formed.

On the other hand, when the adhesive 1 in a molten state is sprayed by the spraying device S, the adhesive 1 is stretched by the blowing force (compressed air) of the applicator S, and is formed into a thread of about 0.1 to 0.2 mm. Become the same spraying equipment S
Are discharged from the nozzles. And the discharged adhesive 1
Is rapidly cooled and solidified upon contact with the atmosphere. When the adhesive 1 is sprayed onto the groove 2 by this action, the adhesive 1 forms a web-like shape at the mouth of the groove 2 (portion indicated by “x” in the figure) as shown in FIG. And solidified, the groove 2
Will close up. Therefore, the adhesive 1 does not spread to the inner part of the groove 2, and it is very difficult to apply the adhesive 1 to the inner part of the groove 2.

Since the design groove formed by drawing in the sheet cover without applying the adhesive to the inner portion of the groove portion 2 has an insufficient adhesive force, the drawn-in portion has an adhesive peeling, wrinkles or This causes inconveniences such as a decrease in the depth of the deep groove and causes deterioration of the appearance of the completed adhesive sheet.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a method of applying a hot-melt type adhesive to a groove, which enables the adhesive to be surely applied to a deep portion of the groove. Aim.

[0009]

According to the present invention, in order to solve the above-mentioned conventional problems, a convex shape having a cross section substantially matching the concave shape of the groove portion is prepared in advance, and the convex shape of the convex portion is prepared. The adhesive is applied to the side surface corresponding to the side surface to form a solidified adhesive film on the side surface, and the solidified adhesive film is separated from the convex shape, and the separated adhesive film is formed. Is fitted along the groove, and is fitted to the inner surface of the groove so that the groove is coated.

[0010]

According to the method described above, the adhesive is not directly sprayed and applied to the groove, but an adhesive film which has been solidified in advance so as to be substantially aligned with the concave shape of the groove by a convex is fitted. Since the adhesive is thereby applied, the adhesive is surely applied to the inner part of the groove.

[0011]

Next, an embodiment of the present invention will be described with reference to FIGS. In this example, a case where an adhesive is applied to a groove for a design groove of a mold pad in a manufacturing process of an adhesive sheet will be described as an example.

In the following description, the adhesives 1 are distinguished from each other by the reference numeral "1w" for the molten state and "1f" for the solidified state.

First, prior to the actual coating operation, a convex mold 3 as shown in FIG. 1 is prepared. The convex mold 3 is formed as an inverted mold of the groove 2 for the design groove (see FIG. 8) formed on the mold pad M, and has a bar shape having a cross section substantially matching the concave shape of the groove 2. Is formed.

In order to facilitate the separation from the solidified adhesive film 1f as described later, the convex mold 3 is made of, for example, an integrally molded olefin resin or a surface formed of an appropriate material. Is formed by Teflon processing.

Next, an adhesive 1 is applied to the convex mold 3, and
As shown in FIG. 2, an adhesive film 1f is formed on a side surface 3a corresponding to the inner side surface of the groove 2 of the convex mold 3.

That is, the adhesive 1 is heated and melted as described above, and is sprayed with 1 w of the adhesive 1 S (spraying device).
And sprayed onto the side surface 3a by the spraying device S in a spray form. The adhesive 1w sprayed in a sprayed state in a molten state is rapidly cooled and solidified when adhered to the side surface 3a, and an adhesive film 1f having a substantially uniform thickness is formed on the side surface 3a. It is done.

Here, as shown in FIG. 6, an adhesive film 1f is formed.
Is not formed along the side surface 3a of the convex mold 3, the film 1f is heated to about 60 ° C. and softened by using, for example, an infrared heater 4 as shown in FIG. 3a (FIG. 2) (convex side 3
(solidified along a).

Next, the adhesive film 1f thus formed is peeled off from the convex mold 3 and separated as shown in FIG. At this time, since the convex mold 3 is formed of the olefin resin as described above, or its surface is subjected to Teflon processing or the like, so-called "wetting" does not occur between the convex mold 3 and the side surface 3a. That is, since no adhesive force is generated, it is easily peeled and separated.

The adhesive film 1f obtained by being separated from the convex mold 3 in this manner is provided with the groove 2 to be coated with the adhesive.
２2 are prepared.

Next, as shown in FIG. 4, the adhesive films 1f to 1f prepared as described above are
2 is fitted along.

Here, the adhesive films 1f to 1f are formed in the grooves 2
Is formed into a substantially U-shaped cross section which can be substantially aligned with the concave shape of the above, so that if an operator pushes in along each of the grooves 2 to 2, the films 1f to 1f are aligned with the inner surface of each of the grooves 2 to 2. It can be easily mounted in a state.

As described above, the films 1f to 1f of the respective adhesives
Is fitted into the groove portions 2 and 2 so that the groove portion 2
2 means that the adhesive 1 has been applied. That is, the state is the same as the state in which the adhesive 1 is applied to the inner surface of the groove 2 and solidified in a layer.

After the grooves 2 to 2 are applied in advance as described above, the adhesive 1 is sprayed and applied to the application surface (general part) other than the grooves by using the spraying tool S again as shown in FIG. do it.

In this embodiment, the following effects can be obtained by using the above-described coating method. That is, the adhesive 1 is applied to the groove 2 by applying an adhesive film 1 which has been solidified and formed in advance into a shape substantially matching the inner surface of the groove 2.
f of the adhesive film.
Is a convex shape 3 which is not a concave shape like the groove portion 2 but a convex shape.
Is formed by spraying and applying an adhesive to the side surface 3a.

Here, it is not difficult to apply a substantially uniform thickness of the adhesive to the protruding portions, and if the adhesive is solidified in a spider web shape on the side surface 3a of the protruding mold 3 (FIG. 6). ) Can be easily corrected by heating and softening as described above.

As described above, the adhesive film 1f is formed in the groove 2
Is fixed in a U-shaped cross-section that is substantially aligned with the inner surface of the groove 2. Therefore, unlike the related art, it is impossible to solidify into a spider web at the mouth of the groove 2 and apply it further to the back. Absent. Therefore, the conventional problem is solved, and the adhesive 1 can be reliably applied to the groove 2 as far as the inner part.

Therefore, the seat cover drawn into the groove 2 is securely adhered along the inner surface of the groove 2, and the finished design groove has a good appearance, and is wrinkled, peeled off or has a reduced deep groove feeling. There is no such defect.

[0028]

According to the present invention, the above method is provided.
Since the application to the groove is reliably performed, the adherend is securely bonded, and wrinkles are generated, the bonding is peeled off, and problems such as a decrease in deep groove feeling are surely eliminated.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a convex type according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of a convex shape on which an adhesive film is formed.

FIG. 3 is a partial perspective view of the convex and adhesive films with the adhesive film separated.

FIG. 4 is a longitudinal sectional view of a mold pad in a state where an adhesive film is fitted into a groove.

FIG. 5 is an explanatory view showing a state of application to a general portion of the mold pad, and is a longitudinal sectional view of the mold pad.

FIG. 6 is a partial perspective view of a convex shape in which an adhesive film is formed in a web shape.

FIG. 7 is an explanatory diagram showing a method of correcting an adhesive film formed in a web shape.

FIG. 8 is an overall perspective view of a mold pad showing a conventional coating method.

FIG. 9 is a sectional view taken along line AA of FIG. 8;

[Explanation of symbols]

M: Mold pad, S: Spraying device 1: Adhesive, 1w: Adhesive in molten state, 1f: Adhesive film 2: Groove portion 3: Convex type, 3a: Side surface

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05D 1/00-7/26

Claims (1)

(57) [Claims] 1. A method for applying a hot-melt type adhesive to an adherend having a groove, the method comprising: applying a hot melt adhesive to the adherend having a groove having a cross section substantially matching the concave shape of the groove in advance. Then, the adhesive is applied to a side surface corresponding to the inner surface of the groove of the convex to form a solidified adhesive film on the side, and the solidified adhesive film is separated from the convex. And
Fitting the separated adhesive film along the groove,
A method for applying a hot-melt type adhesive to a groove, wherein the groove is applied by aligning the groove with the inner surface thereof.