JPH0321938Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement in the shape of a backing material used in a molded product of polyurethane foam such as a cushion body.

[Conventional technology]

Most cushion bodies for automobiles and furniture are manufactured by molding polyurethane foam, in which case many are foamed integrally with a backing material.

FIG. 3 is a sectional view showing a cushion body made of polyurethane foam integrally formed with a backing material. In the figure, 1 is a polyurethane foam layer, and a backing material sheet 2 is adhered to the bottom surface of the polyurethane foam layer 1. As the backing material sheet 2, vinylon cold paper, coarse blanket, gold cloth, nonwoven fabric, hessian cloth, etc. are used.

The purpose of using such a backing sheet 2 is to reinforce the parts that come into contact with springs, iron plates, etc. when the cushion body is assembled, and to partially improve the hardness of the cushion body.

The cushion body shown in Fig. 3 above is manufactured using a mold consisting of a lower mold 3 having a molding quality corresponding to the shape of the cushion body and an upper mold 4 for closing the lower mold, as shown in Fig. 4. be done. At that time, the backing material sheet 2 is attached to the fixing pin 5 planted on the molding surface of the upper mold 4.
is fixed, and a polyurethane foam stock solution is injected into the molding material to perform foam molding.
As shown in the figure, a cushion body is manufactured which is integrally covered with a backing material sheet 2.

By the way, the shape of the backing material sheet 2 to be used differs depending on the shape of the intended polyureta foam molded product. Therefore, depending on the shape of the molded product, the fifth
As shown in the figure, a planar shape in which the central portion is largely constricted and both side portions _{2 1 and} 2 ₃ extending in the same direction from both ends of the central portion 2 2 are separated from each other is also used. Note that 6 in the figure is a hole for setting the skin with a fog ring.

[Problem that the invention attempts to solve]

When polyurethane foam is integrally molded using a planar backing sheet as shown in FIG. 5, there is a problem in that it is difficult to set it on the upper molding surface of the mold.

That is, since the backing material sheet 2 has no stiffness, the mutually separated side portions 2 ₁ and 2 ₃ swing independently, making it extremely difficult to set it in a predetermined position. As a result, there have been accidents where people have stabbed their fingers with the fixing pin 5 and sustained unexpected injuries.

In view of the above circumstances, the present invention has been developed for use in polyurethane foam molded products that have conventionally been integrally foam-molded using a planar backing sheet as shown in Figure 5.
The object of the present invention is to provide a backing material sheet that can significantly facilitate the work of setting it into a mold.

[Means for solving problems]

In order to solve the above problem, in this invention, the fifth
In the case of a backing material sheet having a planar shape where the central portion is constricted and both side portions are separated as shown in the figure, the separated both side portions are connected by a thin band-shaped portion.

The thin band-shaped portion in the backing material sheet of the present invention may be formed at the same time as punching out the backing material sheet of a predetermined shape from a large sheet such as Kanrei paper. Alternatively, a sheet made of the same material as the whole material or a different material may be cut to a desired width and length and bonded to a predetermined position on the backing material sheet using adhesive, staples, or the like.

As for the material of the backing sheet, vinylon cold paper, rough blanket, gold cloth, nonwoven fabric, hessian cloth, etc. may be used as in the past. In addition, when the thin strip-shaped portion is formed of a material different from the material of the whole, other than the above-mentioned materials, for example, a foam sheet, paper, etc. can be used.

The width of the narrow band-like portion depends on the size of the entire backing material sheet, but approximately 2 to 30 mm is sufficient.

[Effect]

In the backing material sheet of the present invention, mutually separated both sides are connected by the thin strip-shaped portion,
Both do not fluctuate independently, making it easy to attach them to a predetermined set position in the mold.

〔Example〕

FIG. 1 is a plan view of a backing sheet according to an embodiment of the present invention. As shown in the figure, this backing material sheet 10 has a central portion 12 and both side portions 11 and 13 extending in the same direction from both ends thereof, and the tips of these both side portions 11 and 13 have a thin strip-shaped portion 15.
are connected with. Note that this backing material sheet was manufactured by punching out vinylon cold paper into the planar shape shown.

In the lining material sheet 10 of the above embodiment, the ends of the extending portions 11 and 13 on both sides are connected to each other by the thin strip portion 15, so that each of the extending portions 11 and 13 does not swing independently as in the conventional case. do not have. Therefore, it can be easily set at a predetermined position in the mold.

FIG. 2 is a plan view showing a lining sheet according to another embodiment of the present invention. As shown in the figure, in this embodiment, the thin strip portion 15 that interconnects the both-side extending portions 11 and 13 is provided not at the tips of the both-side extending portions but at the intermediate portion thereof. All other configurations are the same as the embodiment shown in FIG.

In the embodiment shown in FIG. 2, the same problem as the conventional one occurs beyond the connection position by the thin strip portion 15, but the degree of the problem is significantly smaller. More specifically, when the length of both side extending portions 11 and 13 is L, the desired effect can be sufficiently obtained if the distance l from the tip to the strip portion 15 is 1/2 L or less. I can do it.

[Effect of idea]

As described in detail above, according to the present invention, when manufacturing a polyurethane foam molded product by integral foam molding with a backing material sheet, even if the backing material sheet has a constricted shape in the center, the work of setting it into a mold is easy. It is possible to obtain remarkable effects such as making it considerably easier.

[Brief explanation of drawings]

1 and 2 are plan views showing examples of the lining material sheet according to the present invention, and FIG. 3 is a sectional view showing an example of a cushion body integrally formed with the lining material sheet by foam molding. FIG. 4 is an explanatory diagram showing the manufacturing method thereof, and FIG. 5 is a plan view showing a conventional lining material sheet used for the same molded product as the lining material sheet of the present invention. 10 ...Backing material sheet, 11, 13...Both side extension parts, 12...Central part, 14...Through hole, 15...
thin strip.

Claims (1)

[Scope of utility model registration request] When molding polyurethane foam, it is a backing material sheet that is set on the molding surface of the mold and integrally applied to the back side of the molded product, and has a planar shape with a constricted center and separated sides. A backing material sheet for a molded product of polyurethane foam, characterized in that the separated both sides are connected by a thin band-shaped part.