JPS61160241A - Manufacture of urethane pad having different hardness - 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 <Industrial Application Field> The disclosed technology belongs to the technical field of manufacturing urethane pads that are used for automobile seats and the like and have regions of different hardness.

Therefore, this invention relates to a method for producing a urethane pad having portions of different hardness for an automobile seat by distributing and injecting urethane raw materials r1 having different hardness into a mold and foaming them, and in particular, A different-hard claw urethane pad in which at least one of the urethane raw materials having different hardnesses is applied into the mold by spraying with a spray set and foamed, and then other urethane raw materials are injected into the mold and foamed. of! This invention relates to a Fl manufacturing method.

<Prior Art> In general, in an automobile seat, a spring material is set on a seat frame, and a pad material is placed on top of the spring material, or a thick pad material is placed directly on the top of the seat frame.
Furthermore, the upper surface thereof is covered with a trim cover assembly.

In addition, pads generally used for automobile seats are made of cotton felt, hair lock, palm lock, jute felt, latex foam, urethane foam, etc., and at the same time provide a soft feel to the seat surface to the seated occupant. The seat has a spring action and a damping action as a cushion body.

In recent years, the 16-hold characteristic of the seat has been taken into consideration, and there has been an increasing need for pads with different hardness, with the side portions being harder than the seat surface. This pad with different hardness is produced by

First, as shown in FIG. 5, a mold 1 with a predetermined shape is placed,
A raw material injection nozzle 2.2 is placed at a set position on the side of the mold 1-V,
and 3, and then the raw material injection nozzle 2.2
, and a first urethane raw material 4 and a second urethane raw material 5 having different hardness from 3 are simultaneously injected into the mold 1, and then the first urethane raw material 'F44 and the second urethane raw material 5 are injected into the mold 1. By causing natural foaming, the pad 6 of different hardness is formed into a cross-sectional shape as shown in FIG.

The mold 1 has a partition 7 formed at the boundary between the parts where the first urethane raw material 4 and the second urethane raw material F'1.5 are injected. 5 is prevented from being mixed in.

<Problems to be Solved by the Invention> However, in the conventional method for manufacturing urethane pads of different hardness, the partitions provided in the mold are useless due to the shape of the pad, and two or more types of urethane raw materials are used. There was a drawback that R1 was mixed in too much and the interface between the two or more raw materials was disturbed due to the difference in foaming speed and foaming height, making it impossible to obtain a desired pad.

In addition, in the conventional method described above, in order to prevent two or more types of urethane raw materials from mixing with each other, a partition must be provided at the injection boundary of the urethane raw materials having different hardnesses in the mold.
There was also a problem that the strength of the formed product was sometimes insufficient.

The purpose of this invention is to solve the problems of the method for manufacturing urethane pads with different hardness based on the above-mentioned conventional technology, and to expand the degree of freedom in the arrangement of urethane raw materials with different hardness, thereby improving the functionality and performance of the sheet. The present invention aims to provide a method for producing an excellent urethane pad of different hardness, which improves aesthetics and is useful in fields where foam molding technology is used in various industries.

<Means/effects for solving the problems> In order to solve the above-mentioned problems, the present invention, which is based on the above-mentioned claims, uses a plurality of types of urethane raw materials having different hardnesses. Spraying at least one of the following into the spray set without mixing it with the phase η in the mold to foam it,
A technical measure is taken in which a different type of urethane raw material is then injected into the mold and foamed.

<Example> Next, an example of the present invention will be described below based on FIGS. 1 to 4.

Incidentally, the same parts as those in the conventional mode shown in Fig. 5.6 will be described with the same reference numerals.

Reference numeral 6' denotes a urethane pad of different hardness, which is manufactured according to the present invention, in which both sides formed in a concave shape are made of the first urethane raw material 4 with high hardness as shown in Table 1, and the other parts are , the second urethane raw material F1 with low hardness as shown in Table 2
It consists of 5.

Table 1. When manufacturing the urethane pad 6', first, the first urethane is sprayed on both sides of the mold 1' in zone 8 under the conditions shown in Table 3. The urethane raw material 4 is sprayed and foamed, and then auxiliary materials such as cotton felt are set in zone 9, and the auxiliary materials are placed in injection zone 1o under the conditions shown in Figure 4. Above mold 1
Inject the second urethane raw material F15 into the inside and foam it, and further,
The mold 1' is hardened with the main cores 11, and finally the urethane pads 6' of different hardness formed in the demolding zone 12 are demolded from the mold 1'.

Table 3. In addition, the spray gun 13 used in zone 8 for the above-mentioned spraying has a non-stirring pipe mixer 14 such as a static mixer, and a hose disposed at the base. The static mixer 14 is connected to a polyol mixture tank 15, an isocyanate tank 16, and a cleaning solvent tank 17, respectively, and is sprayed from a spray tip 18 provided at the tip thereof.
The raw material r1 mixed by is injected.

<Sen's Embodiment> It goes without saying that the embodiments of the present invention are not limited to the above-mentioned embodiments, and various embodiments are possible, for example, spraying may be applied only to the surface layer of the pad. Adoptable.

<Effects of the Invention> As described above, according to the present invention, the degree of freedom in the arrangement of urethane raw materials of different hardness is basically expanded, and the sheet can be made flexible to accommodate various sheet shapes of urethane pads of different hardness. The excellent effect of enhancing functionality and aesthetics is achieved.

That is, at least one of multiple types of urethane raw materials having different hardnesses is sprayed and foamed without mixing them into a mold, and then other different types of urethane raw materials are poured into the mold. By injecting and foaming, two or more types of urethane raw materials yp1 do not mix with each other, and there is no disturbance in the interface between each urethane raw material due to differences in foaming speed and foaming height. effect is produced.

Further, since there is no need to provide a cutout in the mold and perform foam molding within the mold, an excellent effect of improving product strength can be achieved.

[Brief explanation of drawings]

1 to 4 are detailed explanatory diagrams of this invention, and 1.2
The figure is a perspective view, Figure 3 is a process diagram, Figure 4 is a schematic diagram, and Figure 5 is a schematic diagram.
FIG. 6 is a sectional view of a conventional embodiment. 4.5... Urethane raw material, 1'... Mold, 6...
・Different hardness urethane pad, 13...spray

Claims (1)

[Claims] In a method for producing a urethane pad with different hardness, in which multiple types of urethane raw materials having different hardnesses are foam-molded in the same mold, at least one of the urethane raw materials having different hardnesses is sprayed into the mold without mixing with each other. 1. A method for producing a urethane pad of different hardness, comprising: foaming the pad by foaming the pad, and then injecting another different type of urethane raw material into the mold to foam the pad.