JPH02144222A - Sun visor for automobile - Google Patents

Abstract

PURPOSE:To dissolve such as difficulty in welding an overcoating material on account of a forming trace of a parting line and burrs attached thereto by shifting the parting line of molds from the center in the thickness direction of a foam particle compact. CONSTITUTION:A sun visor is formed by covering a synthetic resin plastic foam particle compact 1 with an overcoating material 3 after setting a core material 2 in a mold and filling the mold with synthetic resin foam particles. In this case, the parting line part 4 of the molds is shifted from the center part 5 in thickness direction of the foam particle compact 1. Difficulty in welding an overcoating material or necessity of deburring for the sake of avoiding the is difficulty caused on account of the form trace of the parting line part 4 that might be in the center part of the form particle compact 1 and burrs that might be attached thereto, can be respectively dissolved thereby. Moreover, toughness of a sun visor is improved.

Description

[Detailed description of the invention] (Industrial application field) TECHNICAL FIELD The present invention relates to an automatic visor.

[Conventional technology]

Conventionally, temporary or polyurethane foam sheet cages made of wood or synthetic resin could be used as 1-by-1-ear, but since there were problems with safety, durability, IJ-, etc., sobrin-based resin foam was used. 153222) or polypropylene resin foam (Japanese Utility Model Application Publication No. 6053624).

[The problem that the invention attempts to solve]

However, although the phosphor visors using these synthetic resin foams overcome the problems of conventional products by a few yen, they still have problems in the encapsulation process of the covering material.

However, the synthetic resin foamed particle molded product is molded by filling the mold with synthetic resin foam particles, avoiding heating expansion pressure, and performing 1 by melting between the foamed particles. However, in this case [1], cracks are likely to occur at the purging line, which is the joining part of the die in the mold.

On the other hand, in order to cover the foamed particle molded body with a covering material such as vinyl chloride seams 1 to 1 and melt the edges, the melting layer is usually placed at the center (flesh 1 and 7 Since this process is carried out near the center of the direction, the above-mentioned paris interferes, making it difficult to fuse the facing material, and the appearance is also unsatisfactory. Furthermore, when the covering material is I', there is a problem in that when sewing the foamed particle molded article with the fabric, sewing becomes difficult due to the fabric.

The object of the present invention is to solve the problems in the production of conventional foam visors and to provide a lint visor with better workability and excellent physical properties. Tosuru Chino.

[Means to solve the problem]

For this reason, the inventors of the present invention have conducted extensive research into the structure of various foams, and as a result, the parting line of the mold for molding synthetic resin foam particles is set at the center of the foam particle molding (the center in the thickness direction). The inventors have discovered that the above-mentioned problems can be solved by the above method, and have arrived at the present invention.

In other words, the present invention can be used in a molded material made of foamed synthetic resin particles, which is formed by letting a core material into a mold, filling it with foamed synthetic resin particles, and then covering it with a covering material. The purpose of the present invention is to provide a 4-non-visor characterized in that the parding line of the mold is shifted from the center in the thickness direction of the foamed particle molded product.

The foamed bead molded product used in the present invention can be any synthetic resin foamed bead molded product, but is preferably a polyolefin resin foamed bead molded product, such as polyethylene,
It is a foamed particle molded product of polypropylene, a co-merchandising thereof, or a mixture thereof. Compared to other foamed particle molded products, polyolefin resin foamed particle molded products have excellent cushioning properties (flexibility and recovery↑(1)) and heat resistance, which are required for recovery. .

Among these, particularly preferred is a polyethylene resin particle foam molded product. Compared to other polyolefin resin foam moldings, this product satisfies the above-mentioned i4 functions, and
This is because it has excellent moldability, good cosmetic properties, and is economical.

Most preferably, polyethylene resin particles having a density of 0.925 to 0.940 as described in Japanese Patent Publication No. 63-11975 are cross-linked, and then the particles are impregnated with a blowing agent. After preferentially volatilizing the foaming agent on the surface, a foaming treatment suitable for the metal body is performed to form foamed particles having a skin film 1γ that is approximately three times or more larger than the film thickness of the inner cell. Next, the foamed particles are filled into a mold after being given expansion ability, and the foamed particles are fused together by FJD thermal expansion, and the resulting molded product is heated at a temperature of roughly 60°C or higher for at least 61J. A polyethylene foamed particle molded product having substantially no interparticle gaps on the surface obtained by aging treatment, specifically a foamed particle molded product using Asahi Kasei Kogyo (L Wooden Metsu (registered trademark)). The cross-linked polyethylene foam particle molded product, which does not substantially change the spacing, has very strong interparticle fusion, so it goes without saying that it satisfies the above performance compared to other polyethylene resin foam particle molded products. It has excellent moldability and good cosmetic properties (because it has no plasticity, is resistant to cracking and chipping, and has excellent durability).

In the present invention, when the parting line of the mold is moved from the lenter of the foamed particle molded product, the larger the displacement is, the more the parting area where burrs occur will be Although there is some distance from the neck or sewn part, the wall 1'p of the foamed particle molded product is generally thin, about 101M1 to 20M, and the surrounding area is rounded to improve the appearance, so it will not shift. If the size of the molding is increased, a reverse taper (undercut in the 0'l extrusion molding method) will inevitably occur.Therefore, the foamed particle molded product itself must be released from the mold with the reverse taper structure. The molded product has flexibility that allows it to be deformed when released from the mold, recovery properties that allow it to return to its original shape after release, and a level of toughness that does not break even when released from the mold using a reverse taper. This is what is required.

Therefore, from this point of view, the foamed particle molded product used in the present invention is preferably a polyolefin resin foamed particle molded product that has excellent flexibility and recovery properties among synthetic resin particle molded products. Particularly preferred is a polyethylene resin foamed particle molded product having
Most preferred is a cross-linked polyethylene foamed particle molded article, which is described in Japanese Patent Publication No. 11975/1983, published by the University of Technology, which particularly strengthens the fused corners between particles.

Next, a method for manufacturing the sun visor of the present invention will be explained.

First, as shown in FIG. 2, both the core mold and the cavity mold are aligned so that the parting line 4 of the mold of the expanded particle molded product 1 is shifted from the center line in the wall thickness direction, that is, the center.
Prepare the "Abutting mold 2" with J setting. In this case, it is important that the two molds are set so that they are in contact with each other, rather than the usual mating mold. Na1! '', there is a problem with the two-grind mold that if you try to shift the parting line, a step will occur in the foamed particle molded product, and the processing and strength of the aluminum mold mainly used for this type of mold. This is because there is the second problem, and the disadvantage is that the occurrence of Paris increases.

Note that the parding line may be shifted from the center to either the core type or the cavity type.

Further, at this time, a reverse taper (undercut 1 to fA injection molding method) can be intentionally generated.

After setting a core material made by bending a metal wire, such as a thin copper-plated wire, into the cavity of this mold, the mold is clamped. , the foam molding 1J is closed. Then, after cooling it, the ring visor main body 1 shown in FIG. 2, which has been molded with the parding line 4 shifted from the center, is taken out. This is covered with a facing material and finished by welting at the center part 5. As the J5 facing material, vinyl chloride, sheet, yellow, or a laminate thereof is used.

(Example) Example 1 A copper-plated cable with a diameter of 3 mm was bent to form 2 in Figure 1.
A core material having a substantially parallelogram shape with a long side AO cm and a short side 12 cm is manufactured as shown by . This core material 2 is fixed in a hair-bite mold. The mold is a butt mold, and in order to remove the parting line 4 of the foamed particle molded body 1 from the center as shown in Figure 2, the main mold and the core mold are manufactured by changing r[J. has been done. Next, this cavity mold is joined to a core mold and the mold is U-clamped, and then polyethylene foam particles (Asahi Kasei Kogyo Co., Ltd. (Mef O30 product)) are filled into the mold.

Subsequently, after heat fusing with water vapor at a pressure of 1.2 to 2.0 KFI/cnt for 20 to 30 seconds, it was cooled to room temperature with water at about 20°C and then cooled to room temperature with water to form the desired 4 non-visor. A foamed particle molded body in which the parting line 4 shown in FIG. 2, which is the main body, is offset from the center is obtained.

The foamed particle molded product 1 is taken out of the mold and subjected to aging, then covered with a vinyl chloride sheet 3 and melted at the center portion 5 using a welder to obtain the intended sun visor.

In the lean visor of the present invention, as shown in FIG. 2, the parting line 4 is offset from the center 5 of the foamed particle molded product 1, so that it is similar to the covering material 3 and easy to manufacture. On the other hand, in the case of the conventional method shown in FIG. 3, the fusion bonding at the center was poor.

The sun visor obtained according to the present invention is strong and did not sag or sag even after being used for a long time. The relationship between father and son was also very good.

〔Effect of the invention〕

According to the present invention, when fusing the facing material, the molding marks of the parting line in the center of this type of foamed particle molding and the parting line attached thereto may make the fusing itself difficult. In order to avoid this, the inconveniences such as removing paris and increasing other processes are solved all at once, making it much more efficient than before.
The industrial effect of eliminating - from manufacturing is significant.

In addition, the Rinbai 1-A of the present invention has good moldability, especially when a polyethylene resin foamed particle molded product is used, so that it can be easily and easily shaped into the shape of the line 1-L in the automatic machine J1. In addition to the characteristic that the monkey can be molded freely,
Even after using it for 5 days, it is extremely strong without sagging or sagging, and it also has the effect of having a firm feel, good appearance, and a comfortable handling feeling.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-Δ', and FIG. 3 is a sectional view of a conventional product. 1... Polyethylene foamed particle molded product 2... 8IilI wire core material 3... PVC sheet covering material 4... Parting line portion

Claims (1)

[Scope of Claims] 1. Used in a sun visor in which a core material is set in a mold, a synthetic resin foamed particle molded article is molded after being filled with a core material, and the molded article is covered with a covering material. A sun visor characterized in that the parting line of the mold is offset from the center of the expanded particle molded product in the thickness direction. 2. The synthetic resin foamed particle molded article according to claim 1, wherein the synthetic resin foamed particle molded article is a crosslinked polyethylene foamed particle molded article having a skin thickness that is about three times or more larger than the cell membrane thickness inside the foamed particles. Sun visor.