JPH0793991B2 - Cushion body - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cushion body used for a vehicle seat, a furniture chair pad, or the like.

[Prior Art] Various materials have been conventionally used for cushion bodies used for vehicle seats and the like. For example, it has been generally known that a natural material such as palm lock is used or a synthetic resin foam such as urethane foam is used. More recently, as an alternative material, a cushion body made by binding cotton fibers made of crimped synthetic fibers with a resin binder,
For example, it is known from JP-A 61-141388.

On the underside of the cushion body used for automobile seats, S
A spring assembly composed of a spring, a coil tension spring, a wire spring, etc. is horizontally mounted, and the load of a seated person is elastically supported by these springs and a cushion body. In addition, a thin lining layer made of urethane foam or cotton called wading is provided on the back side of the cover material that covers the cushion body to improve the surface feel and appearance and optimize the body pressure distribution. Has been.

[Problems to be Solved by the Invention] Since a cushion body made of natural fiber such as palm lock has a large fiber diameter and has a rough feel, it requires considerably thick wading to improve the surface feel. In addition, in order to improve the surface feel, the softness may be increased by lowering the fiber density or reducing the fiber diameter, but when the lower surface of the cushion body is in contact with the spring, the rigidity of the cushion body is When lowered, the lower surface of the cushion body is easily damaged. In order to prevent the lower surface of the cushion body from being damaged, a strong intermediate support layer called a pad supporter may be provided, but this makes the structure complicated and laborious in manufacturing, and is also disadvantageous in cost.

Therefore, it is an object of the present invention to provide a cushion body which has a good surface feel and cushioning property, is durable on the lower surface side, and is not damaged even when in contact with a spring or the like.

[Means for Solving the Problems] In order to achieve the above object, the present invention is a cushion body having at least two upper and lower layers in the thickness direction, and these upper and lower layers are both wound with a thickness of 50 denier or less. The binder adhesion rate between the fibers of cotton, which is an aggregate of compressed fibers, is 25-35.
% Urethane binder,
Moreover, the lower layer is made of needle-punched cotton with a high density, which is about 1 / 2.5 of the thickness of the upper layer. The upper and lower cotton layers are bonded to each other by the urethane binder. By doing so, the upper layer and the lower layer are integrated.

[Operation] In the cushion body of the present invention, the fibers constituting each layer in the thickness direction are bound by a binder such as urethane, and each layer is integrated. The cushion body itself has an appropriate impact resilience, and the surface condition is soft and uniform. The adhesion between the layers is extremely good, and the layers are completely integrated. In the lower layer portion of the cushion body of the present invention,
High-density cotton with increased degree of entanglement due to needle punching is used. Since this cotton is bound with urethane binder, it is strong without damaging elasticity and does not damage even if it comes in contact with the spring. . Also,
Cushioned fibers with excellent adhesiveness between layers and strong ventilation, because the fibers in each layer are crimped fibers of 50 denier or less and the binder attachment rate is 25 to 35%. Becomes

Example 1 An example of the present invention will be described below with reference to FIG. The drawing shows a cushion member 1 for a seat portion in a front seat of an automobile. The cushion body 1 includes a seating portion 2 located at the center in the width direction, and side support portions 3, 3 located on both left and right sides of the seating portion 2 and protruding upward. Moreover, this cushion body 1 is composed of two upper and lower layers 4 and 5 in the thickness direction.

The upper layer 4 is formed by impregnating a 45% urethane prepolymer / tricene solution with cotton, which is an aggregate of crimped polyester fibers having a thickness of 6 denier, and has a binder adhesion rate of 25 due to centrifugal force.
Use the one with excess liquid removed so that the concentration becomes ~ 35%. The thickness of the upper layer 4 after molding is about 25 mm at the bottom part.

For the lower layer 5, a high-density cotton in which the degree of entanglement between fibers is increased by needle-punching cotton made of crimped polyester fiber having a thickness of 6 denier is used. As an example of needling conditions, the number of needles is 100 / cm ² , the number of punches is 600 times / min, and the speed is 1.5 m / min. The thickness of cotton after needle punching is about 10 mm and the basis weight is 750 g / m ² . . The thickness of needle-punched cotton is reduced to 1/2 to 1/3, and the density is higher and harder. This high-density polyester cotton is impregnated with a 60% urethane prepolymer / tricene solution, and the excess liquid is removed by centrifugal force so that the binder adhesion rate becomes 25 to 35%.

The upper layer 4 and the lower layer 5 thus impregnated with the binder liquid
Each of the cottons is packed in a mold made of punching metal so as to have a predetermined density, and then steam is blown to cure the urethane prepolymer as a binder component. In this way, the entanglement points of the fibers of the upper layer 4 and the lower layer 5 are bound by the urethane binder, and the fibers of the upper layer 4 and the fibers of the lower layer 5 are bonded to each other by the binder and are completely integrated. Since the upper layer 4 and the lower layer 5 are formed by bonding crimped fibers made of the same material to each other with a urethane-based binder, the adhesion between the layers is very good, and the cushioning performance is excellent. The lower layer 5 is made by binding needle punched high-density cotton with a urethane binder, and therefore has higher rigidity than the upper layer 4 and is durable against pulling and the like.

The cushion body 1 is taken out of the mold after the binder is cured. Then, the cushion body 1 is placed on a spring assembly having a spring 6 and a frame.
A product is obtained by providing a cover material made of woven fabric or leather on the outside of the.

Since the fibers constituting the cushion upper layer 4 have a relatively small denier value and density and are molded into a uniform surface hardness with a urethane binder, there is no feeling of foreign matter at the part that comes into contact with the body when sitting, and the surface feel such as the skin feels. good. Moreover, since the outer shape retainability is high in the state covered with the cover material, the appearance finish after the covering is also good.

The cushion lower layer 5 using needle-punched cotton can increase the surface rigidity and the strength against pulling by increasing the basis weight (g / m ² ). Therefore, even if a normal seating load is applied, a pad supporter can be used. Cushion body 1
The lower surface of is not damaged and has sufficient durability as a surface for receiving the spring 6.

[Embodiment 2] The cushion body 1 shown in Fig. 2 is composed of three layers 7, 8 and 9 at the top, middle and bottom in the thickness direction. Upper layer 7 with a thickness of about 8 mm
Is a 6-denier crimped polyester fiber cotton
Impregnated with 45% urethane prepolymer / trycene solution,
Remove excess liquid by centrifugal force so that the binder adhesion rate becomes 25 to 35%.

The middle layer 8 is made by mixing a crimped polyester fiber having a thickness of 38 denier and a crimped polyester fiber of 6 denier in a weight ratio of about 1: 1.
% Urethane prepolymer / trycene solution and remove excess liquid by centrifugal force so that the binder adhesion rate becomes 25-35%. The middle layer 8 is thicker than the upper layer 7, for example
It is 17 mm.

For the lower layer 9, cotton of crimped polyester fiber having a thickness of 6 denier is used, and high density cotton in which the degree of entanglement between fibers is increased by needle punching is used. As an example of the needling conditions, the number of needles is 100 / cm ² , the number of punches is 600 times / min, and the speed is 1.5 m / min), and the thickness after needle punching is about 10 mm and the basis weight is 750 g / m ² . This high-density polyester cotton is impregnated with a 60% urethane prepolymer / trycene solution, and the binder adhesion rate is 25-35 due to centrifugal force.
Excess liquid is removed so that it becomes%.

In this way, the cotton of each layer 7, 8 and 9 impregnated with the binder solution was packed in a mold made of punching metal in the same manner as in Example 1 so as to have a predetermined density, and then steam was blown. Cure the urethane prepolymer. Thus, the fibers of the layers 7, 8 and 9 are bound by the urethane binder and completely integrated. The lower layer 9 is formed by binding needle-punched high-density cotton with a binder, and therefore has higher rigidity than the upper layer 7 and the middle layer 8.

Since the layers 7, 8 and 9 are made by binding fibers of the same material to each other with a urethane-based binder, the adhesiveness between the layers is extremely good and excellent cushioning performance is exhibited. Since the upper layer 7 is made of only fine fibers, a soft feel is obtained and the touch is good. The upper layer 7 also serves as a substitute for wadding. The middle layer 8, which is thicker than the other layers, mainly has a cushioning function. Since the lower layer 9 is formed by binding needle-punched high-density cotton with a binder, it has high surface rigidity and is durable against pulling and the like. Therefore, the lower layer 9 can function as a pad supporter.

In addition, if the fiber becomes too thick, there will be problems in the feeling of touch and the appearance and finish. The fiber thickness should not exceed 50 denier. The cushion body of the present invention can be applied not only to the seat portion of the seat but also to the backrest portion, and can of course be used for a cushion body other than the vehicle seat. In any of the above examples, the adhesion rate of the urethane binder is set to 25 to 25%, but here, when the binder adhesion rate is less than 25%, there is a problem in durability such as a marked decrease in tensile or tear strength. If the binder adhesion rate exceeds 35%, the density increases and the air permeability decreases remarkably, which is not preferable. When fibers having a binder attachment ratio of 50 denier or less are bonded, extremely strong interlayer adhesion is exhibited.

EFFECTS OF THE INVENTION The cushion body of the present invention has excellent cushioning properties, a good surface condition, a strong lower surface, and sufficient resistance to contact with a spring or the like. In addition, a cushioning body having a high adhesive strength between layers and a good breathability, and the like, is comprehensively excellent.

[Brief description of drawings]

FIG. 1 is a sectional view of a cushion body showing a first embodiment of the present invention, and FIG. 2 is a sectional view of a cushion body showing a second embodiment of the present invention. 1 ... Cushion body, 4 ... Upper layer, 5 ... Lower layer, 7 ...
Upper layer, 8 ... Middle layer, 9 ... Lower layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuji Hiromoto No. 1 Shinisogo-cho, Isogo-ku, Yokohama-shi, Kanagawa Nihon Hatsujo Co., Ltd. (56) Reference JP-A-61-141390 (JP, A) 61-137595 (JP, A) Actually opened 62-59500 (JP, U)

Claims (3)

[Claims] 1. A cushion body comprising at least two upper and lower layers in the thickness direction, each of these upper and lower layers being an aggregate of crimped fibers having a thickness of 50 denier or less, and a binder of cotton fibers. It is bonded with a urethane binder with an adhesion rate of 25-35%, and the lower layer is made of dense cotton needle-punched to a thickness of about 1/2 of the thickness of the upper layer. A cushion body characterized in that the upper layer and the lower layer are integrated by bonding the upper and lower cotton layers to each other by the urethane binder. 2. A cushion body comprising upper, middle and lower three layers in the thickness direction, each of which is a bundle of crimped fibers having a thickness of 50 denier or less, and a cotton fiber is adhered to each other with a binder. They are bonded by a urethane binder with a rate of 25 to 35%, and the middle layer uses thicker fibers than the upper layer, and the lower layer has a thickness of about 1/2 of the total thickness of the upper and middle layers. A cushion body characterized by using needle-punched cotton with a high density, and by bonding the cotton of each of these layers to each other by the urethane binder, the layers are integrated. 3. A cushion body composed of at least two layers, upper and lower, in the thickness direction, wherein the upper and lower layers are aggregates of crimped fibers having a thickness of 50 denier or less, and binders of cotton fibers to each other. It is bound by a urethane binder with an adhesion rate of 25 to 35%, and the lower layer is about
Using high-density cotton needle-punched to a thickness of 10 mm, the upper layer and the lower layer were integrated by bonding the cotton of these upper and lower layers to each other with the urethane binder described above. Characteristic cushion body.