JPS5911230A - Preparation of compound resin molded product - Google Patents

Abstract

PURPOSE:To obtain the titled molded products efficiently by reducing molding time and simplifying molding facilities including metal molds through such an arrangement wherein a core mold on which core material is mounted is clamped on a layer of foaming base material, and the core material, a layer of foamed material and a surface layer are integrally composed in layers and causing the foaming base material to foam by heating. CONSTITUTION:A surface skin base material layer 6 of vinyl chloride resin is formed on a cavity mold 1 and a foaming base material layer 7 composed of vinyl chloride resin added with a foaming agent is formed on the surface layer, and then a core mold 2 on which core material 8 is mounted is clamped thereto, and said surface skin base material layer 6 and foaming base material layer 7 are heated and caused to gel and foam and said core material 8, foaming layer 7 and surface skin layer 6' are integrally combined in layers and the titled molded product is thus obtained. The cavity mold 1 and core mold 2 are internally equipped with high frequency generating power sources 3, 3' and they re high- frequency-heated by an oscillator 4. Also, resin solution is sprayed by using a a spray gun 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a composite resin molded product used as a cushion surface material for the interior of a vehicle, such as an instrument pad, door trim, console box, or glove box lid, which is installed in the cabin of a vehicle. The conventional manufacturing method for producing yuzu composite resin molded products is the slush molding method.This slush molding method is broadly divided into a skin molding process and a foam layer molding process. The process involves heating a mold for molding the skin and injecting a vinyl chloride solution into the mold. Next, the mold is rotated and rocked so that the vinyl chloride solution is deposited in the cavity of the mold to a substantially uniform thickness and solidified.
A layer of vinyl chloride is formed within the cavity. Then,
After the mold is cooled, the vinyl chloride layer is released from the mold to form a skin. Next, this skin is set in a separately prepared foaming mold, and the core mold is combined with this foaming mold and the mold is clamped. Next, foamable urethane is injected into the cavity formed by the foam mold, the core mold, and K, and this is further foamed to form a foam layer that is integrated with the skin, and then this is released from the mold to form a product. However, this slush molding method involves a skin molding process,
Since it is necessary to set the skin obtained by this skin molding process in a foam mold and then form a foam layer that is integrated with the skin, this molding process is different from the skin mold. There were problems in terms of equipment because two types of molds were required, including a urethane foam mold, and Niji also had problems in terms of product cost. Furthermore, it is difficult to shorten the heating time of the mold in the step of forming the skin, and the foaming time after the step of injecting the foamable urethane, resulting in low productivity.

The present invention has been made in view of the above circumstances, and its first purpose is to simplify the equipment and significantly shorten the molding process time by using a mold for molding the skin and a mold for molding one foam layer. It is to measure the shortening. The second purpose is to assimilate vinyl chloride using high-frequency heating to extend the life of the mold and save energy.

The third purpose is to obtain a product with high commercial value by being able to clearly apply fine patterns such as stitches to the surface of the product.

Embodiments of the present invention that can achieve the above objects will be described in detail below with reference to the drawings.

1 is a cavity type, and 2 is a core type, and both the cavity type 1 and the core type 2 are provided with high frequency generating electrodes 3 and 3.
' is installed inside, and both electrodes 3 and 3 are connected by an oscillator 4.
′ generates high frequency waves. A spray gun for spraying a resin solution onto the mold surface of the five-cavity mold 1 is shown.

Next, the manufacturing process of a composite resin molded product using the above apparatus W will be described. First, a powdered vinyl chloride spray gun 5 containing vinyl chloride sol and a plasticizer or a prescription agent is used to spray onto the mold surface of the cavity mold 1, and this is solidified over a predetermined reaction time to form a skin material layer 6 made of vinyl chloride resin. Form. Next, a foamed material layer 7 of a sol or powdered vinyl chloride resin containing a foaming agent is applied to the upper surface of the skin material layer 6 using a spray gun 5 (see FIG. 2).

Next, the core mold 2, on which the core material 8 has been inserted in advance, is combined with the above-mentioned cavity mold 1 and the molds are clamped (see FIG. 3).

Next, a high frequency is generated from the high frequency generating electrode 3.3' provided in both molds, and the above skin material/i is heated.
16 and the foam material layer 7 are melted and gelled as shown in FIG. 4, and the foam layer 7', the skin layer 6, and the core material 8 are integrally bonded and molded. By cooling the product thus formed and then releasing it from the mold, the desired composite resin molded product can be obtained.

As described above, in the present invention, the skin material layer 6 made of vinyl chloride resin is formed in the cavity mold 1, and the foamed material layer 7 made of vinyl chloride resin to which a foaming agent is added is formed on the skin material layer 6. Then, the core mold 1 with the core material 8 attached thereto is clamped and heated to form the skin material layer 6 and the foam material layer 7.
This is a method for producing a composite resin molded product characterized by gelling and foaming the core material 8, the foam layer 7', and the skin layer 2 to form an integral layer. Since the skin layer 2, foam material layer 7, and core material 8 can be integrally molded using a single mold, the molding equipment including the mold can be simplified, and the molding process can be greatly reduced. It has the effect of shortening the time. Furthermore, in the present invention, since the vinyl chloride solution is solidified by high-frequency heating, the heating energy of the mold can be saved, which not only saves thermal energy but also has the effect of increasing the durability of the mold. be.

Further, according to the present invention, by forming, for example, an uneven pattern on the mold surface of the cavity mold, it is possible to provide a clear pattern corresponding to the uneven pattern on the surface of the skin material layer 6, and it is possible to produce a product. It also has the advantage of being able to produce products of great value.

[Brief explanation of drawings]

The drawings show an example of the manufacturing method according to the present invention, and FIG. 1 is an explanatory diagram showing the molding process of the skin material ll1iIl. FIG. 2 is an explanatory diagram showing the molding process of the foam material layer. teeth,
An explanatory diagram of the cavity mold and core mold when the mold is closed, Fig. 4 is an explanatory diagram when the mold is foamed, Fig. 5 is an explanatory diagram when the mold is opened, and Fig. 6 is a cross-sectional view of the finished product.1...Cavity mold 2... Core type 3.3'... High frequency generation electrode 4... Oscillator 5.
...Spray gun 6...Skin material layer 6'...
Skin layer 7...Vinyl chloride resin foam material layer 7'...
・Foamed R48... Core material. Figure 1 Figure 2

Claims (1)

[Claims] A skin material layer (6) made of vinyl chloride resin is formed on the capity mold (1), and a foamed material In (7) made of vinyl chloride resin to which a foaming agent is added to the skin material layer (6).
A core mold (1) is formed after which a core material (8) is attached.
The mold is clamped and heated to foam the foam material layer (7) to form the core material (8), foam layer (7') and skin layer (2) into one layer. A method for manufacturing composite resin molded products characterized by the following.