JPH01247117A - Method for molding frame unified type foamed pad - Google Patents

Abstract

PURPOSE:To uniformize a foaming state and to enhance the integrated bonding strength of a foamed resin and a frame, by supplying the resin raw solution injected in a mold to the respective parts in the plate through a diffusion plate. CONSTITUTION:Upper and lower molds 1, 2 are engaged in such a state that the peripheral edge of a skin material 3 is held and fixed between the flanges formed to the peripheral edges of the upper and lower molds 1, 2 and a foamable resin raw liquid is injected in the molds through a resin injection head 4. Whereupon, the emitted raw solution is poured on a diffusion plate 6 and a part thereof is supplied to the lower part of the diffusion plate through through-holes 6a while the other is dripped from the peripheral edge of the diffusion plate 6 in a dispersed state. Therefore, the resin raw solution is injected in the molds while dispersed to respective parts to start foaming and foaming curing is completed in a state integrated with the skin material 3 and, on the side of the rear, molding is completed in a state unified with a cushion frame 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for molding a frame-integrated foam pad, and more particularly to a method for preventing non-uniform foaming due to uneven distribution of resin during resin injection.

[Prior Art] Recently, a method has been adopted in which the frame is integrated at the same time as the foam pad is molded, thereby saving the labor of assembly work after molding.

By the way, there are two methods for molding a foam pad in a mold: pouring a foaming resin stock solution into the open mold, then closing the mold, and allowing foam to form inside the mold; There is a method in which a head is set up (c1), the mold is injected into the mold through the injection head in a closed state, and foaming is performed internally.

According to the former method, it takes time from injection to mold clamping,
Particularly when the frame is temporarily attached to the upper mold, the weight increases and the mold clamping process takes time.

Therefore, when this type of heavy upper mold is used, the latter injection method using a resin injection head is a practical molding method.

[Problems to be Solved by the Invention] However, according to this method, since there is only one injection point, the injected resin concentrates in one place in the mold, and foaming starts from there, causing air to flow into the molded product. Foaming failures such as pooling and underfilling were likely to occur at the farthest point from the injection position on the periphery.

As a countermeasure for this, it has been considered to receive the resin injection head at multiple locations, but in this case, the configuration would be complicated, and furthermore, it would be necessary to mix the foamable resin stock solution and then branch it and supply it to the injection head. was difficult due to factors such as viscosity.

This invention solves the above problems, and in particular, provides a method for molding a frame-integrated foam pad in which the frame is used to diffuse injected resin inside. The purpose is to provide

[Means for Solving the Problems] To achieve the above object, the present invention includes a lower mold and an upper mold, a frame is temporarily fixed to the upper mold, and the upper mold is engaged with the lower mold. In a method for molding a frame-integrated foam pad, in which a foamed synthetic resin stock solution is injected through a resin injection head provided in an upper mold and the foam is foam-molded integrally with the frame, the surface of the frame facing the resin injection head; A diffusion plate was previously provided in the mold, and the resin stock solution injected into the interior through the injection head hit the diffusion plate and was dispersed and injected into each part of the mold from the periphery of the diffusion plate.

Function] Since the resin stock solution injected into the mold is supplied to each part of the mold through the diffusion plate, the foaming state can be made uniform. Further, since the diffusion plate is embedded inside the foamed resin, it is possible to strengthen the integral bond with the foamed resin.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 to 3 show a foam molding method in which the present invention is applied to a skin material and a frame integral foam molding method.

In the figure, 1 is a lower mold having a mold surface corresponding to the surface shape of the seat cushion, and 2 is an upper mold that engages with the lower mold 1.

A skin material 3 is installed in advance on the mold surface of the lower mold 1.

Further, a resin injection head 4 is provided at the center of the upper mold 2, from which a foamable resin stock solution is injected into the mold.

Further, a cushion frame 5 is temporarily fixed to the mold surface of the upper mold 2.

As shown in FIG. 2, this cushion frame 5 includes a plurality of S springs 5b inside a frame body 5a formed in a frame shape.
is suspended.

Further, a diffusion plate 6 is disposed on the frame 5 at a position facing the injection surface of the resin injection head 4.

The diffusion plate 6 has a predetermined diffusion area that is integrated with the inside of the frame body 5a by welding or the like, and a small through hole 6a is formed in a part of the diffusion plate 6.

In the above configuration, the upper and lower molds 1.2 are engaged with the periphery of the skin material 3 being clamped and fixed between the flanges formed on the peripheries of the lower mold 1 and the upper mold, and the foaming resin is passed through the rad 4 to the resin injection. When the stock solution is injected into the mold, the stock solution discharged from the injection head 4 falls onto the diffusion plate 6 as shown in FIG. 3, and a part of it is supplied to the lower part of the diffusion plate 6 through the through hole 6a. At the same time, the others are dropped from the periphery of the diffusion plate 6 in a dispersed state.

Therefore, the resin stock solution is dispersed and injected into each part of the mold, and foaming starts in this state. On the front side, foaming and curing is completed in a state where it is integrated with the skin material 3, and on the back side,
The molding is completed with the cushion frame 5 integrated in a buried or semi-buried state.

Here, the diffusion plate 6 is completely embedded inside the foam pad and serves to strengthen the integral connection between the foam pad and the frame 5.

In addition, when the skin material 3 is an integral type as in the example, in the conventional method, the foamable resin stock solution injected into the mold is the skin material 3.
The problem is that the impregnation is concentrated in one place, and impregnation is particularly easy to proceed in the concentrated area. This problem is fully solved by the present invention, and it is possible to sufficiently prevent the degree of impregnation from increasing locally.

[Effects of the Invention] As described above in detail through the examples, the method for molding a frame-integrated foam pad according to the present invention has the following effects.

That is, since the resin stock solution injected into the mold is supplied to each part of the mold through the diffusion plate, the foaming state can be made uniform even when the resin stock solution is injected from one resin injection head.

Furthermore, since the diffusion plate is embedded within the foamed resin upon completion of foam molding, it is possible to strengthen the integral bond between the foamed resin and the frame.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the entire foam molding mold to which the method of the present invention is applied, Figure 2 is a plan view of a cushion frame applied to the same molding method, and Figure 3 is a diagram showing the injection of the foaming resin stock solution. FIG. 3 is a partially enlarged sectional view. 1...Lower mold 2...Upper mold 4...Resin injection head 5...Cushion frame 6...Diffusion plate Utility model registration applicant Ikeda Bussan Co., Ltd. Agent Patent attorney Hideki Yamamoto

Claims (1)

[Claims] (1) A lower mold and an upper mold are provided, the frame is temporarily fixed to the upper mold, and the foamed synthetic resin stock solution is injected through the resin injection head provided on the upper mold with the upper mold engaged on the lower mold. In a method for forming a frame-integrated foam pad in which a foam is foam-molded integrally with the frame, a diffusion plate is provided in advance on the surface of the frame facing the resin injection head, and the resin is injected into the interior through the injection head. A method for molding a frame-integrated foam pad, characterized in that the resin stock solution hits the diffusion plate and is dispersed and injected into various parts of the mold from the periphery of the diffusion plate.