JPH02140108A - Manufacture for different hardness cushion body - Google Patents

Abstract

PURPOSE:To make the manufacture process of a different hardness cushion body easy by boring a slender hole in a place, where the different hardness part of a foamed body is formed, injecting liquid setting raw material for different hardness part formation from the slender hole and curing the material. CONSTITUTION:In respective armrest parts 1b and 1b of a cushion body 1, slender bottomed holes 2 and 2 are respectively bored from a back end face toward to front direction of a car body and a nozzle 4 for raw material injection is inserted to the slender holes 2 and 2. Then, an adhesive agent is injected as the liquid curing raw material. In the internal part of the respective armrest parts 1b and 1b, the adhesive agent is permeated through continuous foam around the slender holes 2 and 2 into the cushion body 1 and set. Then, hollow high hardness parts 3 and 3 are formed. Supportability is given to the armrest parts 1b and 1b by the hollow high hardness parts 3 and 3 and while the satisfactory feeling of the cushion body 1 is maintained, a load to be added from the arm of a human body can be supported. After the raw material is injected, it is necessary only to dry and cure the raw material and the other special treatment is not needed. Thus, the process for the formation of the different hardness parts 3 and 3 can be effectively simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a cushion body with different hardness provided with different hardness portions therein, and particularly relates to an improvement in the manufacturing process.

(Prior Art) Conventionally, as disclosed in JP-A-61-146514 and JP-A-61-146514, liquid foam raw materials having two different foaming hardnesses have been brought into contact with each other. A method of forming different hardness portions with different hardness in a cushion body by foaming at the same time is a known technique.

(Problem to be Solved by the Invention) However, for example, when providing a hard part inside the cushion body to provide support while ensuring a soft feel on the surface, it is necessary to Although there are cases where it is desired to provide a hardness section, it is not possible to provide a different hardness section inside the cushion body using the conventional method described above. On the other hand, if a hole is created and a solid material of different hardness is inserted into the hole, a problem arises in that another complicated process is required, such as a method for fixing the material of different hardness. become.

The present invention was made by focusing on the fact that a liquid substance easily penetrates into a foam having open cells, and its purpose is to:
The purpose is to facilitate the manufacturing process of cushion bodies of different hardness by utilizing the permeability of liquid hardening raw materials.

(Means for Solving the Problems) In order to achieve the above object, the solution of the present invention is to provide a foam with pores and to inject a liquid curing raw material into the pores.

Specifically, the present invention is directed to a method of manufacturing a cushion body having different hardness, which includes a different hardness portion having a harder hardness than other portions.

After forming pores of a predetermined depth in the foam having open cells, a raw material injection nozzle is inserted into the pores, and a liquid hardening raw material that forms the different hardness portion is injected from the nozzle. ,
In this method, the liquid curing raw material is infiltrated into the air bubbles around the pores of the cushion body and then hardened to form a hollow different hardness portion inside the foam.

(Function) According to the above method, in the present invention, the liquid curing raw material for forming the different hardness portion permeates inside the foam through the open cells surrounding the drilled pores, and then hardens. Therefore, a cushion body of different hardness is obtained in which hollow different hardness portions are formed around the pores. This process only requires injecting liquid raw materials and curing them; no other special steps are required. Therefore, the process is effectively simplified.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows an example in which the present invention is applied to an automobile seat cushion, and 1 is a cushion body made of urethane foam, which is a foam having open cells. The cushion body 1 has a seat portion 1a formed in a substantially planar shape, and armrest portions 1b, lb that are raised in a peak shape on both sides of the seat portion 1a and extend in the longitudinal direction of the vehicle body. Here, each armrest is part 1b.

1b, one bottomed pore 2, 2 is bored from the rear end face toward the front of the vehicle body, and the pore 2 is located just before the armrest part 1b, from the rear end face of lb to the front end face. The armrest extends over almost the entire portion 1b, lb.

As shown in FIG. 2, the raw material injection nozzle 4 is inserted into the pores 2, 2 inside the armrest portions 1b and lb of the cushion body 1, and an adhesive as a liquid hardening raw material is injected. At this time, each armrest is in a state in which the adhesive has penetrated into the open cells around the pores 2, 2 formed inside the portions 1b, lb.

Next, the cushion body 1 is kept in a dry state in a predetermined dryer, and the adhesive is dried and hardened.

Therefore, in the above embodiment, as shown in FIG. 3, the adhesive that has permeated into the cushion body 1 through the open cells around the pores 2°2 hardens inside the portions 1b, 1b of each armrest. As a result, a hollow high-hardness portion 3.3 is formed.

This hollow high-hardness portion 3°3 provides support to the portions 1b and lb of the armrest, making it possible to support the load applied from the elbow of the human body while maintaining the good feel of the cushion body 1. The process for forming the high hardness parts 3, 3 is simple, and after the raw material is injected, it is only necessary to dry and harden the raw material, and no other special treatment is required. Therefore, the process for forming the different hardness portion 3.3 can be effectively simplified.

In the above embodiment, the liquid curing raw material injected from the pores 2 and 2 may be the adhesive of the above embodiment, or a relatively hard urethane foam raw material, etc., and the curing method may be changed depending on the material used. It can be changed. For example, in the case of urethane foam raw materials, curing is performed.

Note that the application of the present invention is not limited to the automobile seat cushion in the above embodiment, but can also be applied to other interior parts of automobiles such as seat packs, and various other uses other than automobiles. It is.

(Effects of the Invention) As explained above, according to the present invention, as a method for manufacturing a cushion body having a different hardness portion having a high hardness inside, pores are formed in the place where the different hardness portion of the foam is to be formed. After drilling a hole and injecting a liquid hardening material for forming a different hardness part through the pore, it is hardened, so that a hollow different hardness part is obtained in which the liquid raw material that has easily penetrated around the pore is hardened. This makes it possible to effectively simplify the process.

[Brief explanation of the drawing]

The drawings show the manufacturing process according to an embodiment of the present invention, and Fig. 1 shows the process of making pores in the cushion body, Fig. 2 shows the process of injecting the adhesive, and Fig. 3 shows the process of drying the adhesive. FIG. 3 is a perspective view of each. DESCRIPTION OF SYMBOLS 1... Foam, 2... Pore, 3... Hollow different hardness part, 4... Nozzle.

Claims (1)

[Claims] (1) A method for manufacturing a cushion body with different hardness, which has a different hardness part inside which is harder than other parts, in which pores of a predetermined depth are formed in a foam having open cells. After inserting a raw material injection nozzle into the pore and injecting the liquid hardening raw material that forms the different hardness portion from the nozzle to infiltrate the liquid hardening raw material into the air bubbles around the pores of the cushion body. A method for manufacturing a cushion body of different hardness, characterized in that a hollow different hardness portion is formed inside the foam by curing.