JPH0557070A - Bonding method for seat cover at groove section of bonded seat - Google Patents

Abstract

PURPOSE:To prevent a bonded seat cover at the decorative groove section of a bonded seat from being separated by firmly bonding the cover even to the side wall of a decorative groove section formed in a mold pad. CONSTITUTION:Bag bodies 16 and 16 connected to a compressed air supply means 18 are provided at both sides of a thrust projection row 15a formed in a press die 15 for thrusting a seat cover 3 along the groove section 2a of a mold pad 2. When the seat cover 3 is thrusted to a suitable position in the depthwise direction of the groove section 2a, the bag bodies 16 are supplied with the compressed air and inflated. The seat cover 3 is thereby pressed against the side walls 2b and 2b of the groove section 2a. The seat cover 3, while being so pressed and maintained, is bonded to the mold pad 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonding method for bonding a seat cover to a groove portion of a mold pad when molding a decorative groove on an adhesive sheet.

[0002]

2. Description of the Related Art Conventionally, when manufacturing, for example, a seat cushion (similar to a seat back) of an adhesive sheet using upper and lower pressing dies, a linear decorative groove is simultaneously formed on the seat surface. Generally, the decorative groove is formed as shown in FIG. 4 or FIG. 5, for example.

First, the pressing cover 11 has a seat cover 3
The mold pad 2 covered with is placed and set.
Here, a groove 2a for pressing the seat cover 3 is formed on the seating surface (the upper surface in the drawing) of the mold pad 2, and a hot melt type adhesive (not shown) for bonding the seat cover 3 is formed. ) Is applied and is in a dry state. On the other hand, the seat cover 3 is formed, for example, by sewing a skin piece cut into a predetermined shape, and the sewn portion 3a is in a state of being pushed along the groove portion 2a of the mold pad 2. There is. Further, the peripheral edge portion (lower end portion in the drawing) of the seat cover 3 is fixed to a seat frame 14 attached to the lower surface side of the mold pad 2, whereby the seat cover 3 is placed at an appropriate position with respect to the mold pad 2. It is temporarily fixed in the positioned state.

After the mold pad 2 is set on the lower clamping die 11 in this way, the upper clamping die 10 is lowered to retain it (state shown). Here, this clamping upper die 10
Is formed on the lower surface of the mold pad 2 in correspondence with the groove portion 2a of the mold pad 2, and the sewn portion 3a of the seat cover 3 is pushed in while being pressed and held. It is in a state of being pushed into the groove portion 2 a of the mold pad 2 by the protrusion 13.

Although not shown in the drawing, this clamping upper die 10
A heating device for melting the adhesive applied to the mold pad 2 by heating the seat cover 3 is connected to the.

[0006] Next, the seat cover 3 is adhered to the mold pad 2 by holding the pressed state, heating and melting the adhesive by the above heating device, and cooling and solidifying again.
At the same time, the seat cover 3 was adhered also in the groove portion 2a of the mold pad 2, and the seat cushion 1 (or seat back) having the linear decorative groove formed on the seat surface could be obtained.

[0007]

However, the above-mentioned conventional bonding method has the following problems. That is, the upper clamping die 10 moves only in the vertical direction, and thereby pushes the seat cover 3 in the depth direction of the groove portion 2a of the mold pad 2, so that the seat cover 3 moves in the width direction of the groove portion 2a, that is, its width. The side walls 2b, 2b are not sufficiently pressed. Therefore, in some cases, as shown in FIG. 5, the seat cover 3 is formed in the groove 2a.
May not be in close contact with the side walls 2b and 2b of the groove 2a, and a gap 2c may be formed.

However, conventionally, the side wall 2 of the groove 2a is conventionally formed.
Since the adhesive is heated and melted while the pressure on b and 2b is insufficient or the gap 2c is generated, and the sheet cover 3 is adhered by being cooled and solidified again, the seat cover in the groove 2a is adhered. The adhesive strength of No. 3 was insufficient, and there were cases where unbonded portions were generated in some cases, and in any case, the adhesive state was not good. Therefore, problems such as peeling of the adhesive during use have occurred.

The present invention has been made in view of this problem.
An object of the present invention is to provide a method for adhering a seat cover in a groove portion of an adhesive sheet, which can obtain sufficient adhesive strength by pressing the seat cover against the side wall of the groove portion.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention has both sides of a push-in ridge formed on a pressing mold for pushing a predetermined portion of a seat cover along a groove of a mold pad. A bag body connected to the compressed air supply means is attached to the surface, and the seat cover is pushed into the groove portion of the mold pad by pressing the pressing die while the bag body is contracted. When the seat is pushed to the proper position in the depth direction of the groove, the seat cover is pressed against the side wall of the groove by supplying compressed air to the bag to inflate it and maintain that state. Then, the seat cover is adhered to the mold pad.

[0011]

According to the above method, the predetermined portion of the seat cover, which becomes the decorative groove, is pushed in the depth direction of the groove portion by the pushing protrusion formed on the pressing mold, and then compressed air is supplied to the bag body. When the bag body expands, a predetermined portion of the seat cover that has been pushed in is pressed against the side wall of the groove portion, the state is maintained, the adhesive is heated and melted, and then cooled and solidified again, so that the seat cover is It is also bonded to the sidewall of the groove with sufficient strength.

[0012]

Embodiments of the present invention will now be described with reference to FIGS. In the present example, the clamping die 11,
Since the seat cover 3, the mold pad 2 and the like do not need to be changed, the description thereof is omitted and the same reference numerals are given in the drawings.

FIG. 1 shows a state in which the upper and lower molds 15 and 11 are clamped. Prior to this state, the pressing clamp 11 is provided with the seat cover 3 as described above. The temporarily fixed mold pad 2 is set, and then the upper clamping die 15 is lowered to the state shown in the figure.

The inside of the clamping upper die 15 is formed into a hollow, and a predetermined heating device is connected to the hollow, which is not shown in the drawing, and a steam of about 60 ° C. is provided in the hollow. The steam can be supplied, and the steam is sprayed onto the seat cover 3 through a large number of blowing holes 20 to 20 formed on the lower surface, whereby the adhesive applied to the mold pad 2 through the seat cover 3 is melted. can do.

The lower surface of the upper clamping die 15 is shown in FIG.
Alternatively, as shown in FIG. 3, a push-in protrusion 15a is formed corresponding to the groove 2a of the mold pad 2. Flat-shaped bags 16 and 16 made of, for example, heat-resistant synthetic rubber are attached to both side surfaces of the push-in ridge 15a, and both side surfaces of each push-in ridge 15a are almost entirely covered. It is covered with a lever body 16.

A hose 17 is connected to each bag 16, and each hose 17 is drawn into the cavity of the pressing upper die 15 through an insertion hole 15b formed on the base side of the pushing protrusion 15a. Each is connected to the compressed air supply means 18 (see FIG. 1).

With this structure, when compressed air is supplied to each bag 16, each bag 16 expands, and conversely, each compressed bag can be withdrawn to contract each bag 16.

The pressing upper mold 15 of this embodiment is constructed as described above, and the seat cover 3 is adhered to the mold pad 2 as follows by using the pressing upper mold 15 to manufacture an adhesive sheet. To be done.

First, when the mold pad 2 is set on the pressing die 11, the upper surface of the mold pad 2 is
For example, a hot-melt type adhesive is applied and dried, and then the seat cover 3 is covered thereon, and the lower end portion of the seat cover 3 has a seat frame 21.
And the seat cover 3 is temporarily fixed. At this time, the sewn portion 3a of the seat cover 3 is in a state of being pushed in along the groove portion 2a of the mold pad 2.
This step is the same as the conventional one, and no particular change is required.

After the mold pad 2 is set on the lower clamping die 11 in this way, the upper clamping die 15 is lowered. At this time, the bag body 1 attached to each of the pushing protrusions 15a to 15a
6 to 16 are deflated by extracting air.
As a result, when the upper clamping die 15 is lowered, the sewn portion 3a of the seat cover 3 is more surely pushed along the groove 2a of the mold pad 2 by the pushing protrusions 15a to 15a. The pushing state at this point is such that the groove portion 2a is sufficiently pushed in the depth direction as shown in FIG. 2, but it is not sufficient in the width direction, and the seat cover 3 has the groove portion 2a. The side walls 2b, 2b are not pressed, and in some cases, a gap 2c is formed between the side walls 2b, 2b.

Thus, as shown in FIG. 1, both upper and lower molds 1
After the pressure is applied to the bags 1 and 15, compressed air is supplied to the bags 16 to 16. As a result, as shown in FIG. 3, each bag 16 inflates and presses the seat cover 3 against the side walls 2b, 2b of the groove 2a.

Next, while maintaining the expanded state of the bag body 16 and the pressed state of the upper and lower molds 11 and 15, the adhesive applied to the mold pad 2 is heated and melted. As described above, this is because steam is supplied to the cavity of the upper clamping die 15 by the heating device, and this steam is blown out into the holes 20 to 20.
Is applied to the seat cover 3 from above.

After the heating is started, if the adhesive is completely melted after an appropriate time, the spraying of steam is stopped,
The adhesive is slowly cooled and solidified again. As described above, the seat cover 3 is adhered to the mold pad 2, and the intended adhesive sheet can be obtained.

In this example, the bonding method as exemplified above provides the following effects. In order to press and hold the seat cover 3 in the groove 2a of the mold pad 2, a pressing protrusion 15a is formed on the lower surface of the upper clamping die 15, and the pressing protrusion 15a causes the seat cover 3 to be deeper than the groove 2a. It is pushed to a sufficient depth in the vertical direction. Further, the seat cover 3 pushed to this sufficient depth has the pushing ridge 15
When the bag body 16 attached to a is expanded, the groove 2a is formed.
The side walls 2b, 2b are pressed and held in close contact with each other, and the seat cover 3 is bonded in this state. From this, the seat cover 3 has the side walls 2b, 2b of the groove 2a.
Also, the problem of peeling the adhesive as in the conventional case is eliminated.

[0025]

As described above, according to the present invention, the seat cover is adhered to the side wall of the groove portion with sufficient strength, so that peeling of the adhesive does not occur and a decorative groove having a good appearance is formed. It can be maintained for a long time.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a mold pad at the time of pressing according to an embodiment of the present invention.

FIG. 2 is a detailed view of a portion A in FIG. 1, and is a vertical cross-sectional view of the periphery of the groove portion when the bag body is contracted.

FIG. 3 is a detailed view of the portion A of FIG. 1 and is a vertical cross-sectional view of the periphery of the groove portion when the bag body is inflated.

FIG. 4 is a vertical cross-sectional view of a mold pad in a state of being clamped and held, according to a conventional bonding method.

5 is a detailed view of a portion B of FIG. 4, which is a vertical cross-sectional view around the groove.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Adhesive sheet 2 ... Mold pad 2a ... Groove part 3 ... Seat cover 3a ... Sewing part 10,15 ... Clamping upper mold 13,15a ... Push-in ridge 11 ... Clamping lower mold 16 ... Bag body, 17 ... Hose, 18 ... Compressed air supply means

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Claims (1)

[Claims] 1. A bag body connected to a compressed air supply means is attached to both side surfaces of a push-in ridge formed on a pressing die for pushing a predetermined portion of a seat cover along a groove portion of a mold pad. In a state in which the bag body is contracted, the pressing die is pressed to push the seat cover into the groove portion of the mold pad, and the seat cover is pushed to an appropriate position in the depth direction of the groove portion. In the above, the adhesive sheet is characterized in that compressed air is supplied to the bag body to inflate it to press the seat cover against the side wall of the groove, and hold the state to adhere the seat cover to the mold pad. Adhesion method of seat cover in groove of.