JPH04363181A - Method for applying hot melt type adhesive to groove part - Google Patents

Abstract

PURPOSE:To allow the sure application of a hot melt adhesive into the deep parts of groove parts in the case of application of this adhesive to a mold pad formed with the groove parts for, for example, design grooves. CONSTITUTION:This method consists in preparing a projecting mold 3 having the section nearly matched with the recessed shape of the groove parts 2, applying the adhesive 1 to side faces of the projecting mold 3 corresponding to the inner side faces of the groove parts 2 to form the films 1f of the solidified adhesive on the side faces 3a, separating the films 1f of the solidified adhesive from the projecting mold 3, fitting the separated films 1f of the adhesive along the groove parts 2, and matching the films with the inner side faces of the groove parts 2, thereby mounting the films.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to the application of a hot-melt adhesive to an adherend such as a mold pad in an adhesive sheet, for example, to a groove for a design formed on the adherend. This invention relates to a method of applying adhesive.

0002

2. Description of the Related Art Conventionally, so-called "hot melt adhesives" have been commonly used as adhesives for bonding seat covers to mold pads to obtain adhesive sheets, for example.

[0003] This hot melt adhesive (hereinafter simply referred to as "
An adhesive (referred to as "adhesive") is an adhesive based on a thermoplastic polymer resin that is solid at room temperature but melts and becomes liquid when heated.For example, it is used in the production of the adhesive sheet mentioned above. In the process, normally, as shown in FIG. 8, the heated and melted state is stored in a predetermined spraying device (hot melt applicator) S, and this spraying device S is used to apply the coated surface of the adherend (mold pad M). It is applied by spraying it on.

The adhesive 1 thus applied adheres to the mold pad, is rapidly cooled, and solidifies in the form of a film on the surface of the mold pad M. Then, when a heated seat cover (not shown) is pressed against the solidified adhesive film, this adhesive 1 melts again and generates so-called "wetting" between it and the seat cover, creating adhesive force. If this pressed state is maintained and the seat cover is cooled again, the seat cover will be bonded to the mold pad M.

[0005]

[Problems to be Solved by the Invention] However, the above conventional coating method has the following problems. That is,
Generally, the molded pad M has a groove 2 formed therein to form a linear design groove on the seat surface when the seat cover is pulled in, and this 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 spraying force (compressed air) of the applicator S and becomes a thread of about 0.1 to 0.2 mm. Same spraying equipment S
is discharged from the nozzle. Then, the discharged adhesive 1
When exposed to the atmosphere, it rapidly cools and solidifies. Due to this action, when the adhesive 1 is sprayed into the groove 2, the adhesive 1 forms a spider web shape at the mouth of the groove 2 (the part marked with an "x" in the figure) as shown in FIG. It solidifies and closes the groove 2. Therefore, the adhesive 1 does not reach the deep part of the groove 2, and it is very difficult to apply the adhesive 1 to the deep part of the groove 2.

[0007]The adhesive strength of the decorative groove formed by pulling the seat cover in without the adhesive being applied to the deep part of the groove 2 is insufficient, resulting in adhesive peeling, wrinkles, or This causes inconveniences such as a decrease in the feel of deep grooves, and causes the appearance of the finished adhesive sheet to deteriorate.

The present invention was developed in view of the above-mentioned conventional problems, and aims to provide a method for applying a hot melt adhesive to a groove, which enables the adhesive to be reliably applied to the deep part of the groove. purpose.

[0009]

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the present invention prepares in advance a convex mold having a cross section that almost matches the concave shape of the groove, and the inside of the groove of the convex mold. applying the adhesive to a side surface corresponding to the side surface to form a solidified adhesive film on the side surface, separating the solidified adhesive film from the convex mold, and separating the solidified adhesive film from the convex mold; The coating is applied to the groove by fitting the adhesive along the groove and aligning with the inner surface of the groove.

0010

[Operation] According to the above method, the adhesive is not directly applied to the groove by spraying, but an adhesive film that has been solidified and formed in advance so as to almost match the concave shape of the groove is fitted into the groove using a convex mold. Since the adhesive is applied by this process, the adhesive reaches the deep part of the groove and is reliably applied.

[0011]

Embodiments Next, embodiments of the present invention will be described with reference to FIGS. 1 to 7. In this example, a case will be described in which an adhesive is applied to a groove for a design groove of a mold pad in the process of manufacturing an adhesive sheet.

[0012] In the following description, the adhesive 1 is distinguished by ``1w'' when it is in a molten state, and ``1f'' when it is in a solidified state.

First, prior to the actual coating operation, a convex mold 3 as shown in FIG. 1 is prepared. This convex shape 3 is formed as an inversion of the design groove 2 (see FIG. 8) formed on the mold pad M, and has a bar shape with a cross section that almost matches the concave shape of the groove 2. It is formed.

[0014] Furthermore, in order to facilitate separation of the solidified adhesive from the film 1f as described later, the convex mold 3 is formed by integrally molding, for example, an olefin resin, or by forming the surface of a material made of an appropriate material. It is formed by Teflon processing.

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

That is, the adhesive 1 is heated and melted as described above and then sprayed onto the spraying device S (spraying device).
The spraying device S sprays the spray onto the side surface 3a in the form of a spray. Then, the adhesive 1w sprayed in a molten state as a spray is rapidly cooled and solidified when it adheres to the same side surface 3a, forming an adhesive film 1f of approximately uniform thickness on the same side surface 3a. It will be done.

Here, as shown in FIG. 6, the adhesive film 1f is
If the film 1f is not formed along the side surface 3a of the convex mold 3, as shown in FIG. 3a to get the state shown in Figure 2 (convex side surface 3a).
(in a solidified state).

Next, the adhesive film 1f thus formed is peeled off and separated from the convex mold 3, as shown in FIG. At this time, since the convex mold 3 is made of olefin resin as described above, or its surface is treated with Teflon, etc., so-called "wetting" does not occur between it and the side surface 3a. In other words, since no adhesive force is generated, they can be easily peeled off and separated.

The adhesive film 1f thus obtained by being separated from the convex mold 3 is applied to the groove 2 to which the adhesive is applied.
~2 numbers are prepared.

Next, the adhesive films 1f to 1f prepared in this way are placed in the respective grooves 2 to 1f as shown in FIG.
It is fitted along 2.

[0021] Here, the adhesive films 1f to 1f are attached to the grooves 2.
Since the membranes 1f to 1f are formed to have a substantially U-shaped cross section that can be almost matched to the concave shape of the grooves 2 to 2, the films 1f to 1f align with the inner surfaces of each of the grooves 2 to 2 when the operator pushes them along the grooves 2 to 2. It can be easily installed in any condition.

As described above, each adhesive film 1f to 1f is
By fitting and installing into the grooves 2-2, the grooves 2-2
This means that adhesive 1 has been applied to area 2. That is, the state is the same as that in which the adhesive 1 is applied to the inner surface of the groove portion 2 and solidified into a layer.

[0023] Once the grooves 2 and 2 have been coated in advance in this way, the adhesive 1 is then sprayed onto the coating surface (general area) other than the grooves using the spraying device S again as shown in Fig. 5. do it.

This example achieves the following effects by using the coating method described above. That is, the adhesive 1 is applied to the groove 2 by applying the adhesive film 1 which has been solidified and formed in advance into a shape that approximately matches the inner surface of the groove 2.
This is done by fitting and attaching the adhesive film 1f.
is a convex shape 3 which is convex instead of concave like groove 2.
It is formed by spraying an adhesive onto the side surface 3a of.

It is not difficult to apply the adhesive to a substantially uniform thickness on the convex portion, and even if the adhesive hardens in a spider web shape on the side surface 3a of the convex mold 3 (see FIG. Even in the state shown in (a), it can be easily corrected by heating and softening as described above.

[0026] In this way, this adhesive film 1f is attached to the groove portion 2.
Since it is fitted in a solidified state with a U-shaped cross section that almost matches the inner surface of the groove 2, the problem of the conventional method where it hardens into a spider web shape at the mouth of the groove 2 and cannot be applied further inside is eliminated. do not have. Therefore, the conventional problems are solved, and the adhesive 1 can be reliably applied to the deep part of the groove 2.

[0027] From this, the seat cover drawn into the groove 2 is reliably adhered along the inner surface of the groove 2, and the finished design groove has a good appearance, and there are no wrinkles, peeling of adhesive, or a decrease in the feeling of deep grooves. There are no such problems.

[0028]

[Effect of the invention] By using the above method, the present invention has the following advantages:
Since the coating is applied to the grooves reliably, the adherend is reliably bonded, and problems such as wrinkles, peeling of the adhesive, and a decrease in the feel of deep grooves are reliably eliminated.

[Brief explanation of the drawing]

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 mold and the adhesive film with the adhesive film separated;

FIG. 4 is a longitudinal cross-sectional view of the mold pad with an adhesive film fitted into the groove.

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

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

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

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

9 is a cross-sectional view taken along the line AA in FIG. 8. FIG.

[Explanation of symbols]

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

Claims (1)

[Claims] 1. A method for applying a hot melt adhesive to a grooved part when applying a hot melt adhesive to an adherend having a grooved part, the method comprising:
A convex mold having a cross section that almost matches the concave shape of the groove is prepared in advance, and the adhesive is applied to the side surface of the convex mold corresponding to the inner surface of the groove, and the adhesive is solidified on the side surface. forming a film, separating the solidified adhesive film from the convex mold, fitting the separated adhesive film along the groove, and aligning and attaching it to the inner surface of the groove. A method for applying a hot melt adhesive to a groove portion.