JPH01299580A - Cushion body - Google Patents

Abstract

PURPOSE:To permit the superior external shape preservation characteristic to co-exist with the superior sitting feeling by using a shaped member which contains cotton which has the higher density than that of the main part and has different hardness on the part where hardness is necessary locally and varying the density of the cotton at the boundary between the hard part and soft part and then hardening the binder which is impregnated into the shaped member and the main part. CONSTITUTION:Each shaped member 9 which contains cotton having a high density and has different hardness is used for the side wall part 5 of a side port part 3 shown by batching in the figure or the upper and lower edge parts 6 and 7 in a shoulder part 2. The shaped member 9 having different hardness is constituted of the high density cotton 11 in which the degree of entanglement between fibers is increased and the cotton 12 having the equal density to that of the main part 10. The cotton in the shaped member 9 having different hardness and the cotton in the main part 10 are impregnated with the excessive binder liquid consisting of urethane polymer/ tricsene solution, and the excessive liquid is removed by centrifugal force so that a prescribed binder liquid adhesion rate is obtained. After the cotton in the shaped member 9 and the main part 10 is set into a mold, urethane polymer is hardened by blowing steam.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cushion body used for vehicle seats, furniture chair pads, and the like.

[Prior Art] Various materials have been used for cushion bodies used in vehicle seats and the like. For example, it is generally known to use natural materials such as palm rock, or to use synthetic resin foams such as urethane foam. More recently, as an alternative material to these materials, cushion bodies are made by bonding crimped synthetic cotton fibers with a resin binder.
For example, it is known from Japanese Patent Laid-Open No. 61-141388.

Usually, the outside of the cushion body is covered with a cover material such as cloth or leather, but when the cover material comes into contact with the edge portion of the cushion body, the edge portion tends to be deformed, resulting in poor appearance after covering. How to improve the appearance after covering 1. It is necessary to increase the hardness so that the edge part does not bend.

From this point of view, conventional methods have been to harden the entire cushion body, or to form a hard impregnated layer along the edges (ridge lines) of the soft urethane foam, as shown in Japanese Utility Model Publication No. 17809/1983. Attempts are being made to do so.

[Problems to be Solved by the Invention] However, if the cushion body is simply made harder, the entire portion that comes into contact with the body when sitting becomes hard, resulting in poor sitting comfort. In addition, even if a hard impregnated layer is formed on a part of the urethane foam to prevent it from deforming during covering, part of the hard impregnated layer will feel like a foreign object when it comes into contact with the body, making it uncomfortable to sit on. ing.

Additionally, if only the edge portion of the cushion body is locally hardened, the hardness of this portion will be significantly different from other portions, and the covered edge portion may become wrinkled, resulting in poor appearance. was there.

Therefore, the object of the present invention is to
To provide a cushion body capable of achieving both good shape retention and good seating comfort.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a cushion body having a main portion formed by bonding intertwined fibers with each other with a resin binder, where hardness is required locally. A molded material of different hardness containing cotton with a higher density than the main part is used in the above-mentioned parts, and the density of the cotton gradually changes at the boundary between the hard part and the soft part. The main part and the fibers of the different hardness molding material are bound by curing the binder component impregnated into the different hardness molding material and the main part.

[Function] In the cushion body of the present invention, the fibers of the main part and the fibers of the molded material of different hardness are bound by the resin binder, and the main part and the molded material of different hardness are integrated, so that
Only the portion where the molded material of different hardness is provided becomes hard by the desired thickness. In this molded material of different hardness, the density of the cotton gradually changes at the boundary between the hard part and the soft part, so when the fibers are bisited together by the binder, the hardness gradually changes. In other words, since the hardness does not suddenly change, it is effective in preventing the occurrence of creases after covering. In addition, the firmness does not change drastically at the point where it touches the body, so you can get a natural feeling when sitting on it.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 shows a part of a cushion body 1 used for the backrest of a front seat of an automobile. This cushion body 1 consists of a back support part 2 that supports the back of a human body when the person is seated, and side support parts 3 (only one of which is shown) that are located on both left and right sides of this back support part 2 and project forward. A groove 4 provided in the cushion body 1, a so-called hanging groove, is for inserting a hanging end of a cover material (not shown).

This cushion body 1 is made by binding the intertwining points of cotton fibers, which are an aggregate of crimped polyester fibers, with a urethane resin binder.

Then, the parts where hardness is required to prevent deformation during covering, - for example, the side wall part 5 of the side support part 3 which is hatched in FIG. 1, or the upper and lower edge parts 6 of the back rest part 2, 7 etc., a molded material 9 of different hardness containing high density cotton is used. In this specification, the main portion excluding the molded material 9 of different hardness is referred to as the main portion 10 of the cushion body 1.

As an example of means for hardening the side wall portion 5 of the side support portion 3, a molded material 9 of different hardness as shown in FIG. 2 was used in this embodiment. This molded material 9 with different hardness has a basis weight of 750 g/
It consists of high-density cotton 11 in which the degree of intertwining of fibers is increased by needle-punching about 100 pieces/d of polyester cotton, and cotton 12 having the same density as the main part 10 which is not needle-punched. The thickness of the needle-punched high-density cotton 11 (approximately 511,111 mm) is reduced to about 1/3 of the thickness before needle punching (approximately 15 m11), and the density is increased and hardened accordingly. As shown in FIG. 2, the edge of the less dense cotton 12 is superimposed on the outer side of the edge of the high density cotton 11.

After the cotton of the different hardness molding material 9 and the cotton of the main part 10 having the above structure are each impregnated with a binder liquid consisting of a urethane prepolymer/Tricene solution excessively, centrifugal force is applied so that a predetermined binder liquid adhesion rate is achieved. Remove excess liquid. The cotton of the different-hardness molding material 9 and the cotton of the main portion 10 are each packed into a mold made of punching metal to a predetermined density. At this time, as shown in FIG. 3, the edges of the cotton 12 with low density are compressed in the thickness direction,
The molding material 9 of different hardness is set correctly at a predetermined position within the mold. Note that, before setting the different hardness molding material 9 in the mold, the different hardness molding material 9 may be previously molded into the state shown in FIG. 3 by an appropriate means.

After the molding material 9 of different hardness and the cotton of the main part 10 are set in a mold, the urethane prepolymer as a binder component is hardened by blowing water vapor into the mold.

In this way, the fibers of the main part 10 and the molded material 9 of different hardness are bound by the urethane binder, and the main part 10 and the molded material 9 of different hardness are integrated with each other as shown in FIG.゛Since needle-punched high-density cotton 11 is used for the molded material 9 of different hardness that reinforces the side wall portion 5 of the cushion body 1, when this fiber 11 is bonded with a binder, the side wall portion is stronger than the main portion 10. The hardness of the surface portion of No. 5 becomes locally high.

After the cushion body 1 is taken out from the mold, it is placed on a seat frame and a spring assembly (not shown), and a cover material made of woven fabric or leather is provided on the outside of the cushion body 1 to become a product. In the covered state, the cover material hits the edge portion of the side wall portion 5 of the cushion body 1, but the molded material 9 of different hardness reinforcing the side wall portion 5 exhibits appropriate hardness and prevents the cushion body from deforming. Therefore, it is possible to cover the desired shape with good appearance.

In the area where the molding material 9 of different hardness is provided, the density of the connection part between the high-density cotton 11 and the low-density cotton 12 changes gradually, so that after the binder has hardened, the hard part and the soft part At the boundary between parts, the hardness gradually changes.

Note that the high-density cotton 11 does not necessarily have to be needle-punched. For example, as in the second embodiment of the present invention shown in FIGS. 5 to 7, a portion of the cotton 12 having a density similar to that of the main portion 10, that is, a portion where hardness is required, is removed by appropriate means. The high-density cotton 11' may be obtained by compressing the cotton in the thickness direction and reducing the thickness as shown in FIG. After molding, the main portion 10 and the molded material 9 of different hardness are completely integrated as shown in FIG. 7, so that the same effects as in the previous embodiment can be obtained. The present invention can also be applied to increasing the hardness of ridgeline parts such as seat seats.
Of course, it can also be used for cushion bodies other than vehicle seats.

[Effects of the Invention] According to the present invention, it is possible to locally harden the surface portion at a desired location where hardness is required, and the hardness does not suddenly change at the boundary where the hardness changes. When covered, the appearance is good and the seating feeling is also good.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, FIG. 1 is a perspective view of a part of the cushion body, FIG. 2 is a sectional view of a molded material of different hardness, and FIG. FIG. 4 is a cross-sectional view of a part of the cushion body taken along line IV-IV in FIG. 1, and FIG. 5 is a cross-sectional view of a molded material having different hardness. A cross-sectional view of cotton for hardness molding material, Figure 6 is
A cross-sectional view of the cotton shown in the figure after being molded.
FIG. 3 is a cross-sectional view of a state in which the molded material of different hardness shown in the figure is integrated with the main portion. DESCRIPTION OF SYMBOLS 1... Cushion body, 9... Different hardness molding material, 10.
...Main part, 11.11'...High density cotton, 12...Low density cotton. Applicant's representative, patent attorney Takehiko Suzue Figure 1 Figure 4 Figure 70

Claims (4)

[Claims] (1) A cushion body that has a main part made of intertwined fibers bound together with a resin binder, and has a different hardness that contains cotton with a higher density than the main part in areas where local hardness is required. A molding material is used, and this molding material of different hardness is made so that the density of cotton gradually changes at the boundary between the hard part and the soft part, and a binder impregnated in this molding material of different hardness and the above-mentioned main part. A cushion body characterized by binding the main part and fibers of a molded material of different hardness by curing the components. (2) The cushion body according to claim 1, wherein the fibers of the main portion and the molded material of different hardness are both crimped polyester fibers, and the binder is a urethane resin. (3) The above-mentioned molded material of different hardness is made of high-density cotton that has been needle-punched to increase the degree of intertwining of the fibers,
Claim 1: The cotton is thicker and has a lower density than the high-density cotton, and is formed so that the edge of the lower-density cotton overlaps the outer edge of the high-density cotton.
Cushion body as described. (4) The cushion body according to claim 1, wherein the molded material of different hardness has a part where the density is increased by compressing a part of cotton in the thickness direction to reduce the thickness.