JPS62102708A - Cushion body - 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 [Field of Industrial Application] The present invention relates to a cushion body used for vehicle seats, furniture, bedding, etc.

[Conventional technology]

In cushion bodies used for vehicle seats such as automobiles, both sides of the seat, known as the bank, are made hard in order to support the lateral loads that are applied to the occupants when driving around curves, etc., and improve holdability. things are being done.

When it is desired to harden the side portions of the seat in this way, in the case of conventional cushion bodies made of synthetic resin foam, wires or hard chip foam are buried in the side portions, for example. Alternatively, this area may be reinforced by injecting a hard urethane foam stock solution into the side area.

In addition, in the case of a cushion body using fibers, increase the density of the fibers stuffed into the side parts, or in the case of a cushion body in which the fibers are bound together with a binder, add a large amount of binder to the parts where you want to make it hard. Methods such as using

[Problem that the invention seeks to solve]

However, with each of the above-mentioned methods, there is an increase in the number of man-hours due to the installation of the above-mentioned buried objects in the part that is desired to be hardened, or an increase in material costs to increase the density, which is not only disadvantageous in terms of cost, but also increases the This goes against the desire to reduce the weight of vehicles.

[Means for solving problems]

The cushion body of the present invention is a cushion body in which fibers are bonded to each other with a binder, in which the fibers are arranged mainly in the longitudinal direction with respect to the direction in which the load is applied in the portion where the hardness is desired to be 15,
In addition, the fibers are arranged mainly in the lateral direction with respect to the direction in which the 6:1 weight is applied in areas where softness is desired. As the fiber, for example, a crimped polyester synthetic fiber is suitable, and as the binder, for example, a urethane-based binder is suitable.

〔Example〕

In this example, the fibers used are polyester-based crimped synthetic fibers (for example, Ondai, registered trademark HIBULI).
I, 6 denier, hollow conjugate type).

Urethane prepolymer (Mitsui Nisso urethane,
NC0%-5 synthesized from MN3050 and T-80
±0.2%)/triclene solution (prepolymer concentration 1 to 70 wt%).

The above polyester cotton is removed by centrifugal force until a predetermined amount of binder solution is impregnated, and then packed into a mold to have a predetermined density.

At this time, the main part 1 (which corresponds to the seating part of the car seat)
For areas that you want to make relatively soft (see Figure 1),
The polyester cotton is stuffed into a mold so that the fiber arrangement direction is mainly transverse to the direction in which the load is applied. Also,
In areas where it is desired to be relatively hard, such as both side parts 2, polyester cotton is stuffed into the mold so that the fibers are arranged mainly in the longitudinal direction.

Through the above process, polyester cotton with an appropriate amount of urethane prepolymer attached is coated with 90 to 1
A cushion body was obtained by blowing steam at 30°C for 4 minutes to cure and then demolding.

In the cushion body, the surfaces of the polyester fibers are coated with a urethane binder, and the fibers are connected to each other by the binder at the intersections of the fibers. Both side portions 2 of the sheet are hard, and the central main portion 1 is relatively soft. As shown in FIG. 2, in the cushion body of the above embodiment, the portion where the fibers are arranged in the vertical direction can be made approximately twice as hard as the portion where the fibers are arranged in the horizontal direction. Moreover, since the direction in which the fibers are arranged is simply changed, there is no need to increase the density.

[Comparative Example 1] (Different hardness foam by two-layer foaming) Molecule m 3000, consisting of a polyether polyol with 3 functional groups, toluene φ di-isocyanate (T-80), water as a blowing agent, and other auxiliaries. After stirring two hot urethane raw materials with different hardnesses using separate mixing heads, a predetermined amount is poured into a temperature-controlled mold, and the mold is closed. At this time, hard prescription raw materials are injected into the areas where hardness is desired. After that, mold the mold to 170
Heat for 1 degree at 'C for 1 minute to harden the urethane foam and then remove it from the mold. Detailed prescription examples are shown in Table 1.

Table 1 (Urethane foam formulation example) [Comparative example 2] (Chip insert) Molecule 03000, polyether polyol with 3 functional groups, toluene diisocyanate (T-80), water as a blowing agent, and other auxiliaries A hot urethane raw material with the following formulation is stirred with a mixing head. Thereafter, a predetermined amount of the urethane raw material is injected into a mold whose temperature has been adjusted in advance and a chip molded product is set in the part where hardness is desired to be increased, and the mold is closed. After that, mold the mold to 170
"C" for 10 minutes to harden the urethane foam and then remove it from the mold.For detailed prescription examples, see Comparative Example 1 (Table 1
).

[Comparative Example 3] A web is obtained after opening polyester cotton (Music University, registered trademark HIBULII 6 denier, hollow conjugate type composite polymer). This web is made of urethane prepolymer (Mitsui Nisso Urethane).

M N 3050 and T -80 are synthesized and N CO
% -5±0.2%)/triclene solution (prepolymer concentration 40 wt%). This is desoluted to a predetermined amount by centrifugal force and packed into a mold to a predetermined density. At this time, the density of the polyester cotton is increased in the areas where it is desired to be hard (both sides of the sheet).

And the polyester cotton stuffed inside the mold contains 90%
Steam of NCO or more of 130" to 130" C is blown into the mold for 4 minutes to cure it, and then demold.

Table 2 below compares the hardness, density, etc. of the cushion bodies according to Comparative Examples 1 to 3 and this example.

Table 2 As can be seen from Table 2, conventional cushioning bodies with different hardness have a large weight because they either increase the density of the parts that are desired to be hard or embed chip molded products. Moreover, the number of man-hours increases due to the provision of buried objects, or the cost of materials increases to increase the density, resulting in higher costs. On the other hand, in this embodiment, attention is paid to the fact that the hardness changes by changing the direction of the fibers, and cushion bodies with different hardness can be obtained with the same density.

Note that the cushion body of the present invention can also be used for purposes other than automobile seats. Furthermore, the portions to be hardened are not limited to both side portions, and may be set appropriately as necessary.

〔Effect of the invention〕

According to the present invention, it is possible to provide a cushion body with a hard portion and a soft portion without using an embedded member or changing the density, and it is possible to provide a lightweight and low-cost cushion body with different hardness.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a cushion body showing an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between fiber direction and hardness. Applicant's agent Patent attorney Takehiko Suzue Figure 1 8 degrees (9 Am3) Figure 2

Claims (1)

[Claims] In a cushion body in which fibers are bonded to each other with a binder, the fibers are arranged mainly vertically in the direction in which the load is applied in areas where stiffness is desired, and the fibers are arranged in the direction in which the load is applied in areas where it is desired to be soft. A cushion body characterized by being arranged mainly in the horizontal direction.