JPS63294891A - Trim cover for seat and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) [The present invention mainly relates to a trim cover for seats of automobiles, etc. and a manufacturing method thereof, and particularly to a method for sewing a plurality of skin materials such as vinyl leather. This invention relates to a seat trim cover and its manufacturing method.

(Prior art) There are two types of trim covers for automobile seats: those that are sewn, and those that are formed using vacuum forming, heat pressing, etc.
The former type of sewing is currently the mainstream.

FIG. 6 shows a seat cushion for a general automobile seat, and the trim cover 1, which is the top covering thereof, is made by cutting and sewing a plurality of skin materials 2 such as vinyl leather. 3 is the seam portion.

By the way, such a sewing trim cover 1 has a skin material 2.
If the seams are simply sewn together with thread, the seamed portion 3
There is an inconvenient problem in that there are gaps in the seams, and rainwater that falls from windows etc. can enter there and seep into the batt inside the seat.

For this reason, conventionally, as shown in FIG. 7, the above-mentioned sewing trim cover 1 is heated m@ as shown in FIG. I
, the seam portion 3 is made waterproof. The heat welded part 5 is made by turning the sewn skin material 2.2 inside out.
A pair of left and right weld molds 6.
They are thermally welded by applying an 8-frequency voltage while being sandwiched between the parts 7 and 7.

As shown in the figure, the skin material 2 is often a laminated sheet made of vinyl chloride leather 2a, foamed II (wadding>2b, and base fabric (wadding cover) 2c.In addition, a laminated sheet made of vinyl chloride leather 2a only) There are some things.

(Problems to be Solved by the Invention) By the way, in the conventional seat trim cover described above,
The skin materials 2.2 are sewn together with sewing thread 4 and welded by high frequency heat, and as can be seen from the cross section in Figure 7, the heat welded portion 5 directly connects the upper part of the sewing thread 4 between the skin materials. Since they are simply joined and thermally welded, they tend to peel off easily under tension, which is not very useful for waterproofing, and the peeled areas look unsightly, resulting in a significant decrease in product value.

Further, if the surface of the skin material 2.2 is subjected to a printed pattern or surface treatment, the peel strength of the heat welded portion 5 is even weaker, and it is not useful for increasing the sewing strength or waterproofing effect.

On the other hand, in the method of flipping the skin materials 2, 2 sewn together as described above and sandwiching them between a pair of left and right welder molds 6.7 and thermally welding them using high-frequency heating, only straight parts can be thermally welded.
It is difficult to heat weld curved parts, and it is not possible to fully accommodate various designs.Also, even if there is a straight part, if it is divided into multiple parts, each part must be heat welded separately, which increases the number of man-hours. It took a lot of work and was very troublesome.

The present invention was developed in view of the above circumstances, and is a sheet with high product value that has extremely high peel strength against tension at the seamed portion of the skin materials, increases the strength of the heat welded portion, and provides sufficient waterproofing effects. The purpose of the present invention is to provide a trim cover for use in the market and a manufacturing method thereof.

(Structure of the Invention) (Means for Solving the Problem) In order to achieve the above-mentioned object, the seat trim cover of the present invention first includes a seam between the skin materials that is sewn together so that this gap extends from the surface side in the longitudinal direction. It is characterized in that a thin strip of thermoplastic resin material is added and heat welded to fill the area.

In addition, the manufacturing method for the seat trim cover is to sew the skin materials together, and add a thin strip-shaped thermoplastic resin material to the stitched portions of the skin materials from the surface in the longitudinal direction. In this state, pressure is applied from both the front and back sides, and the thermoplastic resin material is thermally welded to the seamed portion of the skin materials by means such as high frequency heating or ultrasonic heating so as to fill the gap.

(Function) With the above configuration, the seamed parts of the skin materials are not directly joined and thermally welded as in the past, but a thin band-shaped strip is attached to the seamed parts of the skin materials in the longitudinal direction from the surface. Since the thermoplastic resin material is added and heat-welded to fill the space between the seamed parts, the peeling strength against the tension of the seamed parts of the skin materials is extremely high, which eliminates the problem of peeling. As a result, sufficient waterproofing effect can be obtained.
This is a seat trim cover that looks very good and has high product value.

Furthermore, even when the surface of the skin material has a printed pattern or surface treatment, it is possible to obtain a fully waterproof seat trim cover that has high peel strength due to thermal welding and has an excellent design.

On the other hand, as mentioned above, since the thermoplastic resin material added to the surface of the seamed portion of the skin materials is pressurized from both the front and back sides of the seamed portion and thermally welded by means such as high frequency heating or ultrasonic heating, Thermal welding can be easily done not only on straight parts but also on curved parts, making it fully compatible with various designs, and also making it possible to heat weld multiple parts at the same time, reducing the number of man-hours and simplifying the work. Become.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 3. Note that the overall view of the trim cover of the present invention is substantially the same as that shown in FIG. 6 described above, and therefore will be omitted.

First, FIG. 1 is a partially enlarged sectional view of a completed seat trim cover 11 according to the present invention, and FIGS. 2 and 3 are sectional views of the peripheral portion showing the manufacturing process thereof.

Here, the manufacturing method of the trim cover 11 will be described. First, as shown in FIG. The skin material 12 is a laminated sheet made of vinyl chloride leather 128, a foam layer 12b, and a base fabric 12c, as in the conventional case.

A thermoplastic resin material 15 is applied to the surfaces of the seamed parts 13 of the skin material 12 and 12 in the above-mentioned sewn state in the longitudinal direction.
Attach and set it so that it is placed on top. The thermoplastic resin material 15 is a thin strip-like material made of polyvinyl chloride resin or the like which is easily thermally welded to the skin material 12.

Then, as described above (the thermoplastic resin material 15 is sewn to the part 13
With the attachment set on the top, while pulling the sewn portion 13 from side to side to the extent that tension is applied to the sewing thread 14 there, the sewn portion 13 is longitudinally sewn on both the front and back sides as shown in FIG. 3. Pressure is applied between a pair of upper and lower welder molds 16.17 of a high-frequency welder so as to sandwich the thermoplastic resin material 15 from the sides, and a high-frequency voltage is applied between the upper and lower welder molds 16.17 to form the thermoplastic resin material 15 into a skin material 12.12. Mutual seam part 1
3. Heat weld to fill this gap.

The mold was thus opened, cooled and hardened, and the product was taken out as shown in FIG.

In the seat trim cover 11 manufactured in this way, a thin strip-shaped thermoplastic resin material 15 is attached to the seamed portion 13 between the skin materials 12 and 12 so as to fill the gap from the surface side in the longitudinal direction. Since they are heat welded together, there are no gaps.

Therefore, if the seat trim cover 11 described above is
A thin strip-shaped thermoplastic resin material 15 is attached to the seamed portion 13 of the skin material 12 and 12 from this surface in the longitudinal direction, and is heated to fill the gap between the seamed portions. The heat welded part is wider and deeper than the conventional one, and there is no discontinuous part, so the peel strength against left and right tensile force is very high, and the waterproof effect is fully obtained, so there is no need to peel it off unnecessarily. Problems such as loss of waterproofness, poor appearance, and reduction in product value can be resolved, resulting in a product that has a very good appearance and high product value.

Furthermore, the improvement in peel strength due to thermal welding of the thermoplastic resin material 15 allows the use of a skin material whose surface has been subjected to a printed pattern or surface treatment. In other words, even if skin materials with printed patterns or surface treatments are directly heat-welded together in the conventional manner, the heat-resistant peel strength of the welded part is very weak and will easily peel off. By thermally welding the thermoplastic resin material 15, such peel strength problems can be solved, and a completely waterproof sheet trim cover with an excellent design can be obtained.

On the other hand, in the manufacturing method described above, the thermoplastic resin material 15 attached to the surface of the seamed portion 13 between the skin materials 12° 12 is inserted into the welder mold 16.1 from both the front and back sides of the seamed portion 13.
Since heat welding is carried out by applying pressure as if sandwiching between the parts 7, the heat welding can be easily carried out not only on straight parts but also on curved parts, and can be applied to various designs. Furthermore, even if the heat-welded part (sewn part 13) is separated into multiple parts, it is possible to heat-weld them at the same time, thereby reducing the number of man-hours and simplifying the work.

Note that the present invention is not limited to the above embodiments,
For example, although the thermoplastic resin material 15 is thermally welded to the seamed portion 13 between the skin materials 12.degree. 12 using a high-frequency welder, the thermal welding may be performed by other means such as ultrasonic heating.

Further, the skin material 12 may be made of vinyl chloride leather or other materials other than the laminated sheet.

Furthermore, by coloring the thermoplastic resin material 15 in a different color from the skin material 12 in advance, a colored stripe pattern can be ensured at the seam portion 13 on the surface of the trim cover, allowing for a variety of designs to be enjoyed.

Furthermore, when thermally welding the thermoplastic resin material 15 to the seamed portion 13 of the skin material 12° 12 by high frequency heating,
It is also possible to further improve the design by adding high frequency patterns 81 such as seams or other various geometric patterns to the surface of the thermoplastic resin material 15.

Furthermore, the gutter joining portion 13 between the skin materials 12 and 12
Alternatively, a hanging cloth (not shown) may be sewn together so as to extend to the back surface thereof, and the thermoplastic resin material 15 may be thermally welded thereto in the same manner as described above.

Furthermore, FIGS. 4 and 5 show other embodiments of the present invention.
However, here, a molded welt, that is, a thermoplastic resin material 25 having a substantially T-shaped cross section is used. In this case, the hanging piece 25a of the thermoplastic resin material 25 is attached to the skin material 12.1.
The two sewing parts 13 are sandwiched between each other and sewn together with sewing thread 14, and in this state, they are heat-welded in the same manner as described above.

This allows the thermoplastic resin material 25 to be positioned and set reliably, eliminating positional deviation during heat welding, further increasing strength and ensuring waterproofness, and making the heat welding work easier.

In addition, by setting a thermoplastic resin material 25 with a beaded edge 25b on the surface side as shown in the drawing, and thermally welding it using a welder mold 16 having a corresponding groove 168, In addition to improving the peel strength and waterproofness of the sewn portion 13, it becomes possible to simultaneously attach the welt.

〔Effect of the invention〕

Since the present invention is made as described above, it is possible to obtain a seat trim cover which has a very high tensile peel strength at the seamed portion of the skin materials, has a sufficient waterproof effect, has an excellent design, and has a high product value.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention. Figure 1 is a partially enlarged sectional view of a completed seat trim cover, and Figures 2 and 3 show the manufacturing process. 4 is a sectional view of the manufacturing process showing another embodiment of the present invention, FIG. 5 is a sectional view of the thermally welded state of the same embodiment, and FIG. 6 is a sectional view of the sheet showing a conventional example. FIG. 7 is an overall perspective view of the trim cover, and is a sectional view taken along the line Vl-Vl in FIG. 6. 11... Seat trim cover, 12... Skin material,
13...Sewing portion, 14...Sewing thread, 15.25
...Thermoplastic resin material, 16.17...Welder type. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Ki 3 Figure 4 Figure 6

Claims (4)

[Claims] (1) In a seat trim cover made by sewing a plurality of skin materials such as vinyl leather, a thin band-shaped strip is installed at the seam portion of the skin materials to fill the gap from the front side in the longitudinal direction. A seat trim cover characterized by being heat-welded with a thermoplastic resin added thereto. (2) The trim cover for a seat according to claim 1, wherein the thermoplastic resin material is colored differently from the skin material. (3) In a manufacturing method for manufacturing a seat trim cover using a plurality of skin materials such as vinyl leather, the skin materials are sewn together, and a seam is attached to the seamed portion of the skin materials from this surface in the longitudinal direction. A thin belt-shaped thermoplastic resin material is attached to the skin, and in this state, pressure is applied from both the front and back sides, and this gap is filled with the thermoplastic resin material at the seamed portion of the skin materials using means such as high frequency heating or ultrasonic heating. A manufacturing method for a seat trim cover characterized by heat welding in a filled state. (4) A sheet according to claim 3, characterized in that a pattern is applied to the surface of the thermoplastic resin material using high frequency waves or the like when the thermoplastic resin material is thermally welded to the seamed portions of the skin materials. How to make trim covers.