JPS60124223A - Molding process for aperture of urethane foamed product - Google Patents

Abstract

PURPOSE:To prevent the occurrence of flash at an aperture by trimming skin, urethane and core member together after the urethane has been poured and foamed, while setting the skin and the core member in a pouring mold without punching perfectly the aperture of the core member. CONSTITUTION:At the aperture of the core member 1 of an iron plate, notches 5 are provided, leaving several connecting parts such that an inside plate 3 is not disconnected, and the width of the notches 5 is made narrow so as to prevent the passing of urethane. The skin 7 and the core member 1 are set in an urethane pouring mold, and urethane is poured and cured. Then, a molded product is taken out and excessive skin, urethane 6 and core member are trimmed together by a blades 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for shaping an opening of a urethane foam molded product formed by urethane injection foaming.

Conventional urethane injection foaming has been used to improve the skin, urethane foam layer,
When molding a urethane foam molded product consisting of a laminate of 8 layers, if the core (Δ) is too hard and the opening cannot be trimmed at the same time as the skin and urethane foam layer, trim the 1 layer at the stage of manufacturing the 8 layers. They used one with an opening.However,
With this method, when the urethane is foamed in the opening L1, the foaming pressure causes the urethane to leak to the back side of the 8-layer, resulting in unnecessary urethane foam (see Figure 1).

” 1. The burr 17 is not only wasted on the urethane, but also has the risk of interfering with the other object, so it is necessary to remove it, and in order to facilitate the removal of this burr, release agent is used. Extra work such as coating was required.

The present invention has the advantages of 41. To provide an open or rs++1 forming method for urethane foam molded products, which can prevent the occurrence of cracks in open IZJ rflll during urethane injection foaming and improve work efficiency. The purpose is to

The structure of the present invention is that when molding the opening of a urethane foam molded product, the 8-hole opening Ml (without completely punching out the opening Ml) is provided with a notch that can be easily trimmed in the punching process, and inside the opening of the core material. Leave the side roots as a lid. 1. Set the epidermis and the core material in the injection mold, inject urethane and foam, then
This is a deviation from the original method of trimming the skin, urethane, and core material together to form an opening.

Embodiments of the present invention will be described below with reference to the drawings.

During the press forming process, the opening g2 of the core material 1 made of an iron plate is formed along the ring of the desired opening 2, leaving a connecting part 4 at a certain point to prevent the middle plate 3 from coming off. Include 5. One corner of this notch 5 is provided so that the urethane 6 does not fall on the back surface ζ through the gap m. Further, the size and number of the connecting portions 4 should be such that the middle plate 3 does not come off during the urethane injection and foaming process and can be easily punched through. Next, the outer skin 7 whose outer shape has been molded by vacuum corrugation, slash mold molding, etc. and the core material 1 are placed in a urethane injection mold 8 and urethane is injected and foamed. Injection mold 8, August 1
A contact surface 11 with the core material l is precisely provided so that the urethane 6 does not go around from the end edge part 9 of the core material l to the back surface depth 10 of the core material l. This prevents urethane from leaking from the edge 77B9 of the core material 1. Also, from opening 2 on August 1st,
Since the opening is closed by the middle plate 3, the urethane 6
will not leak. Next, the urethane foam molded product 12 is taken out from the injection mold 8, and the excess skin 13 on the outer periphery of the product is removed.
and the opening 2 are trimmed to form a urethane foam molded product 14.
is completed. Since the core material 1 is provided with a notch 5 in the opening 2, the skin flap, urethane 6, and core material 1 can be trimmed together without damaging the blade 15.

Incidentally, in the above embodiment, an iron plate was used for the 8-section 1, but resin may also be used. In that case, the notches of the opening 1 and the 2 may be provided as in the above-mentioned iron plate, or the 2 (s) Figure 4/5
As shown in the figure, the plate j≠ may be made into a square shape or a groove 16 may be provided.

Second, by applying the present invention to urethane foam molded products, it is possible to obtain a method for molding openings that does not generate flakes, and it is possible to improve work efficiency.

[Brief explanation of the drawing]

1 to 10 show embodiments of the invention. Fig. 1 is a perspective view of the core material, Fig. 2 is an enlarged view of the 1st r, sI A section, Fig. 3 is an enlarged cross-sectional view of the II-■ section in Fig. 2, and Fig. 4
The figure is an enlarged cross-sectional view of II-I+ when August is molded with resin, Fig. 5 is an enlarged cross-sectional view of IV-IV of Fig. 4, Fig. 6 is a cross-sectional view of howurethane injection mold, and Fig. 7 is urethane foam molding. A perspective view of the product taken out from the urethane injection mold, Figure 8 is an enlarged cross-sectional view of Figure 7, Figure 9 is a completed view of the urethane foam molded product, and Figure 10 is Figure 9. 11 is an enlarged cross-sectional view of lX=■, and FIG. 11 is a view corresponding to FIG. 10 according to the conventional molding method. l... Core material, 2... Opening, 5... Notch, 6... Urethane, 7... Outer skin, 8...
... Urethane injection foam type. Patent registration applicant Nishikawa Kasei Co., Ltd. Representative Kazufumi Sakashita Figure 2 Figure 3m Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] After making a notch, setting the core (2) and the skin in a urethane injection foaming mold, and injecting and foaming the urethane, trim the skin, urethane, and layer 8 together to form an opening. A method for forming an opening of a urethane foam molded product, characterized in that leakage of urethane to the back side of a core material at the opening in the urethane injection foaming process is prevented.