JPS60219018A - Manufacture of laminated cushion - Google Patents

Abstract

PURPOSE:To form high-quality cushion having laminated foam of varying hardness simultaneously by first injecting different foaming liquids into voids divided with inserted partition boards into a mold and pulling out the afore-mentioned partition boards in accordance with foaming speed. CONSTITUTION:For instance, partitions 2 are inserted into a mold 1 equipped with a lid 3 installed in freely open and close manner, and different foaming liquids A and B are injected into a right and a left chamber of the mold 1 divided by the partition board 2. Then the lid is closed and both foaming liquids are caused to foam simultaneously and the afore-mentioned partition boards 2 are pulled out from inside the mold at the same speed as foaming speed. Thus an aimed product 4 is obtained by forming foams of varying hardness in the mold 1 simultaneously.

Description

[Detailed Description of the Invention] The present invention relates to a method of manufacturing a cushion body used for a vehicle seat, particularly urethane resin, etc. The present invention relates to a method for successfully molding a cushion body in which foamed foams of different hardness are laminated.

BACKGROUND ART In recent years, cushion bodies in which foams of different hardness are laminated have been used as cushioning materials for vehicle seats such as automobiles in order to improve the ability to hold and cushion the body of a seated person. FIG. 1 shows an example of such a cushion body, in which a central portion 11 where the back or buttocks of a seated person is located is molded from urethane foam with a small hardness, and from this central portion 1 forward. Raised left and right parts 12.1
2 is molded from urethane foam with high hardness.

Conventionally, the manufacturing of cushion bodies in which foams with different hardnesses are laminated has been carried out by (1) foam-molding foams with different hardnesses separately, and bonding them together after molding.
403 Publication), (2) Forms with impregnated surfaces formed on the adhesive surfaces of foams with different hardness (Japanese Utility Model Publication No. 49-37954, Japanese Utility Model Publication No. 49-31922, Japanese Utility Model Publication No. 48-32108), (31 Adhesive Surface) In order to prevent the formation of an impregnated surface on the
After foam-molding the foam of 4)--, a foaming stock solution having a different hardness was injected into the molded product and foam-molding was carried out. However, in the method (11) described above, the number of manufacturing steps is large because separate foam molding is performed and bonded.
Method 2) lacks properties as a sheet because the impregnated surface cannot be made uniform, method (3) has poor workability because the film coating process is troublesome, and method (4)
Step-by-step foam molding was a must, and the number of steps was increasing. Therefore, neither method is suitable for manufacturing a laminated cushion body.

The present invention provides a manufacturing method in which a cushion body in which foams of different hardness are laminated can be manufactured in one foam molding process, and the resulting cushion body also has good force cushioning properties and holdability. Alternatively, one or more partition plates are inserted into the mold, and different foaming stock solutions are injected into the mold using the partition plates as boundaries, and then the partition plates are pulled out from the mold in accordance with the foaming speed. ! It is a sign.

To explain the present invention in more detail below, FIGS. 2 to 5 show the order of the manufacturing process, 1 is a mold for foaming, and 3 is a mold that is attached to the mold 1 so as to be openable and closable. It is a lid. First, the partition plate 2 is inserted into such a mold 111. This partition plate 2 divides the inside of the mold 1 into left and right halves and serves as a boundary between which foams having different hardnesses are foamed on the left and right sides. Next, as shown in Figure 3,
Different foaming stock solutions A and Btl are injected into the left and right chambers of the mold 1 with the partition plate 2 as a boundary, and the lid 3 is closed to allow both foaming stock solutions to foam at the same time. In this foaming process, as shown in FIG. The partition plate 2 is pulled out of the mold at the same speed as the foaming speed, and foams of different hardness are simultaneously foam-molded within the mold.

Therefore, the molded product 4 taken out from the mold after foaming is in a state where foams A and B of different hardness are layered, as shown in FIG. 5, but they are separated by the partition plate during foaming. Since the stock solutions do not mix together, each stock solution is foamed with its own characteristics, and the interface C between Form A and tS is not impregnated with the two liquids, so the characteristics of each foam are is embodied as it is.

FIG. 6 shows another method of the present invention, in which two partition plates 2, 2 are inserted into the mold 1, and the inside of the mold is divided into three parts.
It is divided. The central chamber contains a foaming stock solution with a low hardness, and the left and right chambers contain a foaming stock solution E with a high hardness.
The partition plate 2.2 is injected into the mold, and the partition plate 2.2 is pulled out from the mold while foaming. In this case, a cushion body as shown in FIG. 1 is obtained, and its manufacture can be easily carried out in one step.

According to the present invention described above, a cushion body in which foams having different hardnesses are laminated can be obtained by one foaming process,
It is possible to reduce the number of steps, and since no impregnated surface is generated on the bonding surface of the foam due to the interposition of the partition plate, the characteristics of each foam can be directly realized, and a molded product with good cushioning properties can be obtained. Further, there are advantages in that the molded product can be made uniform without variations, the thickness of the foam can be changed as desired, and furthermore, the cushion body can be manufactured quickly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of a laminated cushion body, FIGS. 2 to 5 are sectional views showing the process order, and FIG. 6 is a sectional view of another method. 1...Mold, 2...Partition plate, A, B, D,
E... - Foaming concentrate patent applicant NHK Spring Co., Ltd. agent Patent attorney Hide Sato 1971 Durham Ii - Author '21 It seems to be in trouble (g Mio40 Zr515'1

Claims (1)

[Claims] Lamination characterized by inserting one or more partition plates into the mold, injecting different foaming stock solutions into the mold using the partition plates as boundaries, and then pulling out the partition plates from the mold in accordance with the foaming speed. A method of manufacturing a cushion body.