JPS59201818A - High frequency bonding method of door interior trimming material for automobile - Google Patents

Abstract

PURPOSE:To well prepare an interior trimming material without damaging the same, in the high frequency bonding of the interior trimming material, by a method wherein electric power weak enough to generate a spark is at first applied and, successively, strong electric power is applied while the whole leading end of an electrode is brought into contact with the above mentioned interior trimming material to perform sufficient bonding. CONSTITUTION:A plate shaped base member 7, a buffer member 8 and a trimming member 9 are stacked to be mounted on a lower surface plate 2 used as one electrode and an upper surface plate 1 is fallen to pressurize said members 7, 8, 9 by the electrode 4 used as a mold provided to the under surface of said plate 1 while, at the same time, electric power weak enough to generate a spark is supplied and, succeedingly, stronger electric power is supplied to perfectly bond said members 7, 8, 9 in such a state that the whole leading end of the electrode 4 is perfectly brought into contact with the constitutional members 7, 8, 9 of an interior trimming material. By this method, the damage of a decorative member caused by spark generation is prevented and the interior trimming material can be well prepared.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to an improvement in a high frequency bonding method used in manufacturing automobile door interior materials and the like.

By the way, interior materials for automobile doors are required to have a certain degree of mechanical strength, cushioning properties, and decorative properties.

For this reason, the above-mentioned normal interior materials are composed of a heart board as a basic member, a urethane sponge as a cushioning member, and a vinyl leather or sheet or a woven fabric of synthetic or natural fiber as a 1iJ member, and these three are polymerized and integrated. It has a structured structure.

In manufacturing such interior materials, in order to efficiently polymerize and integrate the three types of components mentioned above, a method is adopted in which each component is melted and bonded in dots or cotton-like shapes using high-frequency dielectric heat generation. , and in order to improve the adhesion, members made of materials other than vinyl are usually coated with vinyl in advance on their mating surfaces.

However, in high-frequency bonding in this case, a considerable amount of high-frequency power is used depending on the material and size of each of the above-mentioned members, so the following problems arise. That is, if the power supply is set high to ensure sufficient adhesion, the heating time will be shortened, but when the power is supplied, sparks are generated from the electrodes pressuring each member, and the members, In particular, it often damages decorative members and therefore makes the finished product, the interior material, defective. Furthermore, if the power supply is set conservatively to avoid spark generation, even if the heating time is increased, the adhesion will be insufficient and the product will likely be defective.

In order to deal with this problem, conventionally, the supplied power is set at a value approximately midway between a value below which adhesion is incomplete and a value at which sparks may occur. For example, if the supplied power is set to 20 hours as shown by the dashed line in Figure 5, the adhesion will be incomplete, and if it is set to less than 30 Kw as shown by the broken line B, sparks will occur, as shown by the solid line C. It is set to 25, which is between them, and -.

In this figure, Tr is the rise time of the supplied power,
Th is the heating time, and Tc is the cooling time immediately after heating.

However, such conventional measures are only ambiguous compromise solutions and do not fully solve the above-mentioned problems, so they may still cause sparks or cause insufficient adhesion. .

On the other hand, the above-mentioned undesirable sparks often occur when the entire tip of the electrode that applies pressure to the member to be bonded is not in complete contact with the member. In other words, high-frequency power tends to concentrate at the part of the electrode tip that is not in contact with the above-mentioned member, and is particularly strong at the edged end of the tip, which causes sparks. Therefore, in order to prevent this spark from occurring, it is sufficient to bring the entire tip of the electrode into complete contact with the above-mentioned member.However, in reality, warping of the base member and uneven thickness of the decorative member may occur. Therefore, it is difficult to always achieve perfect contact, and especially when the decorative member is made of two or more types of materials joined together, a step may occur at the seam. Therefore, complete contact at this point is unlikely to be achieved.

The present invention deals with the above-mentioned circumstances and aims to improve high-frequency adhesion when producing interior materials for automobile doors or interior materials having a similar structure, by supplying high-frequency waves to electrodes. By changing the strength of high-frequency power during heating,
The power is weak in the first half and strong in the second half, so that complete contact of the entire electrode tip can be achieved in the first half, and sufficient adhesion can be achieved in the second half. The details will be explained below according to the drawings.

First, to explain the outline of a general high-frequency bonding device, as shown in FIG. It is supported so that it can be raised and lowered at any time. An electrode 4 that also serves as a mold is attached to the lower side of the surface plate 1, and the other electrode that is paired with this electrode also serves as the surface plate 2.

Note that both of these electrodes are appropriately connected to a high frequency power source 5 so that set high frequency power is supplied at any time.

Next, the interior material to which the method of the present invention is applied is shown in FIG. This interior material 6 is as shown in FIG.
, a plate-shaped base member 7 made of a relatively hard material such as hardboard, a buffer member 8 made of an elastic material such as urethane sponge, and a vinyl leather or sheet or a woven fabric of synthetic or natural fibers. Decorative member 9
In the embodiment shown in FIG. 3, the decorative member 9 is made of two different materials 9a and 9b joined together.

Such interior material 6 is manufactured using the above-mentioned apparatus in the following manner. First, as shown in FIG. 1, the base member 7 is placed on the lower surface plate 2, and the buffer member 8 and the decorative part 9 are sequentially placed on top of it. Next, the upper surface plate 1 is lowered, and the electrode 4 on the lower surface of the plate, which also serves as a mold, pressurizes each member 7, 8, 9, and at the same time, between this electrode and the lower surface plate 2. When high-frequency power is supplied, the parts of each member pressurized by the electrode 4 are heated by their own dielectric heat generation, and the coating layer of the member except the base member 7 and the other members 8.9 are heated. The above-mentioned pressurized part softens, and some of it melts.
are glued together (10).

However, during this adhesion, each of the above members 7. 8. The tip of the electrode 4 that first applies pressure to the decorative member 9 does not necessarily come into complete contact with the decorative member 9 on the tongue, and may partially come into incomplete contact.

In particular, the decorative member 9 is made of two types of materials 9 as shown in FIG.
If it is a combination of a and 9b, see (1) in the same figure.
As shown in (2), since there is a step [2.13] at the seam 11, when pressure is applied, as shown in (2) in the same figure, a point 12' where contact is incomplete is created between the electrode tip and A space 13' is also created between the buffer member 8 and the buffer member 8. Therefore, if high frequency power is supplied as is, the above point]2'
There is a risk that sparks will occur, and poor adhesion will occur in the void 13'.

Therefore, the present invention deals with this voice as shown in FIG.

That is, under the condition that the electrode 4 or each member 7, 8.9 is pressurized as shown in FIG.
Let it heat up for a while. Then, other parts except the foundation member 7+;
The pressurized parts 18 and 9 are softened and deformed to fill the space 12' and the space 13' near the seam 11a], and as shown in FIG. 3, the decorative member 9 is Step 12.
13, the entire tip of the electrode 4 is brought into complete contact with this portion, and the member is also brought into close contact with the buffer member 8 without any gaps. Of course, at this time, the coach ink layer of the base member 7 is also softened.

Next, under these conditions, this time,
High-frequency power of, for example, 30 Ky, which is so strong that conventionally would have caused a risk of spark generation, is supplied to heat for Thb time. However, at this time, the entire tip of the electrode 4 is in complete contact with the decorative member 9, and since there is no gap between the members 7, 8, and 9 at least in the pressurized parts, each of these members is free from sparks. Adhesion is sufficient without any generation.

In FIG. 4, Tra and Trb are the rise times of the supplied power, and Tc is the cooling time immediately after heating, and at least during this time, the members that have just been bonded remain pressurized by the electrodes 4. The adhesion state is fixed.

As described above, the present invention relates to high-frequency bonding when producing the above-mentioned interior materials, by changing the strength of the high-frequency power supplied for heating during the heating process, and making the strength of the high-frequency power supplied for heating so weak that it does not generate sparks in the first half. Electric power is supplied, followed by stronger electric power in the second half, and the entire tip of the electrode is first brought into complete contact with the constituent members of the interior material, and then the members are sufficiently bonded. Therefore, according to the bonding method of the present invention, the bonding of each component during the production of the interior material can be carried out well without the generation of sparks, and the decorative components caused by the sparks can be bonded well. It is possible to reliably prevent the occurrence of defective products due to damage or insufficient adhesion.

[Brief explanation of the drawing]

Fig. 1 is a front view schematically showing the high frequency bonding device, Fig. 2 is a front view of the interior +J targeted by the present invention, Fig. 3 (]),
(2), (31 is an enlarged mold diagram showing the embodiment of the present invention in the order of steps, Fig. 4 is a diagram showing an example of the high frequency power supplied in the above embodiment, and Fig. 5 is a diagram showing the power supplied in the conventional example. Figure 7 shows an example of the high frequency power generated. 1... Upper surface plate, 2 - Lower surface plate, 4... Electrode, 5
. . . Image frequency power source, 6. Interior material, 7. Foundation member, 8. Buffer member, 9. Decoration member, 10.
Adhesive part patent applicant Hiniku Shiraki Co., Ltd.
Kanto Seat Mfg. Co., Ltd. Handling Amendment Form B Screen 058 Nod Date Commissioner of the Patent Office 1 Case Description IIIJ Ro 1958 Special 5th Sacrifice No. 076748 2 Title of Invention Akane Chichisu for Automobile Interior Materials, etc. Concubine t7i? Leaving 3 H
People who do E (Science with cows)
6-3-12 Kamiyu, Tennoji-ku, Osaka ((t
h1 name) 4 agent As per the attached sheet (1) r on page 8, line 4 of the specification ---1. Add the following explanation after ``. [Although the decorative member 9 is made of only one type of material and therefore does not have the above-mentioned steps 12 and 13, it is necessary to prevent the entire tips of the electrodes 4 from completely contacting each other due to uneven thickness or other reasons. or when this decorative member 9 is made of woven fabric and therefore the gaps between the fibers prevent complete contact of the entire electrode tip, the @pole 4
Similarly, the entire tip can be brought into complete contact with the decorative member 9, and the member can be brought into close contact with the loose member 8 without any gaps. (2) Add the following explanation between the second and first lines from the bottom of the same page. ``By the way, the above embodiment is intended for a high-frequency adhesive device of the type in which the electrode 4, which also serves as a mold, is attached to the upper surface plate 1, and the lower surface plate 2 also serves as the other electrode. However, the present invention also applies to a type of high-frequency adhesive device in which the electrode 4 is mounted upward on the lower surface plate 2, and the upper surface plate 1 also serves as the other electrode. Of course, this can be implemented in exactly the same way.In other words, among the door interior materials targeted by the present invention,
Particularly in the case of interior materials for automobile doors, elongated decorative moldings are often adhered to the surface of the decorative member 9 at the same time. Although upwardly mounted types of high frequency bonding equipment are more commonly used, the invention can be practiced with such equipment as well. ”

Claims (1)

[Claims] (11) Regarding interior materials in which a plate-shaped base member, a cushioning member, and a decorative member are bonded in places and integrated by polymerization, each of the above-mentioned members is A lower surface plate that also serves as one electrode for placing the members in an overlapping state, and a metal plate attached to the underside of the upper surface plate that can be raised and lowered at any time toward the surface plate to pressurize each of the above members. Between the electrode and the other electrode, which also serves as the mold, first a weak enough high-frequency power to generate a spark is supplied, followed by a high-frequency power strong enough to enable sufficient adhesion. Features: High-frequency bonding method for automobile door interior materials, etc.