JPH05445A - Blow molded products - Google Patents

Abstract

(57) [Summary] [Purpose] Blow-molded products with excellent dimensional accuracy and strength. [Structure] A blow-molded product in which a reinforcing material formed of a plastic material having compatibility with the plastic material forming the main body is inserted. [Effect] A plastic molded product with high dimensional accuracy and excellent strength. When disposing of a product using a reinforcing material of the same quality as the main body, there is no need to sort by material, and it is extremely easy to return to raw materials.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to blow-molded articles having high strength and versatility.

[0002]

2. Description of the Related Art The blow molding method is becoming increasingly important in the plastics industry as a method for mass-producing products of the same quality at low cost, and various products are manufactured by this method. However, it has been difficult to increase the thickness of a specific portion and reinforce it by the blow molding method.

[0003]

Although it is possible to properly mold a metal mold within a very narrow range to form a thick wall, it is not suitable for the purpose of reinforcing a large-sized molded product over a wide range. For this reason, a method of adhering or screwing a reinforcing material such as a metal to the reinforcement of a large-sized molded product has been adopted, but there have been many troubles due to damage from the reinforced portion or difference in material. Therefore, there has been a strong demand in various fields for a method for obtaining a molded article which is reinforced over a wide range in blow molded articles, especially large blow molded articles, and for the development of blow molded articles reinforced by the method.

Conventionally, there has been a blow-molded product in which a small metal member is inserted for the purpose of connecting to other constituent parts, but a metal of a sufficient size has not been inserted for the purpose of reinforcement. The reason is, for example,
There is no need to insert large parts for the purpose of connection, and there is a possibility that distortion or peeling may occur over time due to differences in materials (lack of affinity, differences in physical properties such as shrinkage). Can be mentioned. On the other hand, in recent years, products in which plastics having different properties (soft plastic and rigid plastic) are integrally molded and the difference in properties is utilized have been provided (for example, automobile ducts using hard plastic and soft plastic). However, these are for the purpose of integrally forming the curved portion by utilizing the difference in properties, not for the purpose of reinforcement, and the risk of peeling or deformation due to the difference in material. Is still open.

[0005]

SUMMARY OF THE INVENTION In blow molding, the present inventors insert a reinforcing material preformed using a plastic material having a compatibility with the plastic material forming the main body during the blow molding of the main body. Has succeeded in solving the above problems.

[0006] That is, the present invention provides a blow-molded product of a plastic, which is obtained by inserting a reinforcing material formed of a plastic having a compatibility with the plastic material constituting the main body.

As the plastic material for the blow-molded article of the present invention, various materials used in the art can be used. Such plastic materials can include polyethylene, polypropylene, polycarbonate, polystyrene, ABS, and composite materials thereof. These plastic materials are compatible with each other and can be used as a body and stiffener for each other.

For the purpose of the present invention, it is particularly preferable that the plastic material of the main body is one of the above-exemplified plastic materials and the reinforcing material is made of the same plastic material as the plastic constituting the main body. Among them, polypropylene, polyethylene, and A
BS resin is preferred. When the same material is used, the affinity is particularly high, the size of the product is maintained, and there is no fear of peeling, and a useful reinforced plastic molded product is obtained. Moreover, there is an advantage that the plastic molded product can be reused. Conventionally, the reuse of various plastic products has been hindered because the constituent materials cannot be separated, but the present invention can solve such a problem. Therefore, the above is a very important advantage when considering the effective use of resources.

The blow-molded article of the present invention can be manufactured by a blow-molding method using an insert material known to those skilled in the art. Usually, when the parison is lowered, a plastic reinforcement material formed in advance to an appropriate size is sandwiched by a mold on the side to be reinforced, and the plastic reinforcement material is inserted into the main body simultaneously with blow molding. In this case, by appropriately adjusting the length and width of the reinforcing material to be inserted, it is possible to obtain a reinforcing molded product according to the purpose of use.

[0010]

According to the present invention, a plastic material having the same quality as the main body or an affinity with the main body can be inserted as a reinforcing material, so that bumper beams, side door beams, seat frames, floor panels, floating bridges of automobiles can be inserted. Blow-molded products with high dimensional accuracy and strength, such as desk boards and water tank panels, can be easily produced. Moreover, when the main body and the reinforcing material are made of the same plastic material, it is not necessary to sort them into various materials,
Since it can be returned to the raw materials all at once, its reuse becomes extremely easy.

[0011]

EXAMPLES Example 1 Bumper rain hosement (automobile bumper beam) FIG. 1 shows a molding process of a reinforced bumper rain hosement. In the figure, 1 is a parison, 2 is a mold, and 3 is a reinforcing material. 1) Reinforcing material 3 is held in mold 2. 2) The state where the parison 1 descends and the mold 2 separates (Fig. 1
The state moves from A) to the state where the mold 2 is closed (FIG. 1B). 3) As usual, molding is performed while blowing air from the lower air blowing port. 4) The reinforcing material 3 sandwiched by the mold 2 is inserted into the parison 1. 5) When the mold 2 is released, a bumper reinforcement having the reinforcing member 3 having a desired length inserted in the main body 4 is obtained. FIG. 2 is a sectional view of the molded product. 3A is a sectional view taken along the line aa of the bumper reinforcement shown in FIG. 2, and FIG.
It is b sectional drawing.

Example 2 Rigid body (floating pier) An image body is molded by the blow molding method in substantially the same manner as in Example 1 above. This one is used as a floating pier. FIG. 4 is a perspective view in which a part of the body is cut away. In the figure, 3 is a reinforcing material and 4 is a main body.

[0013]

The blow-molded product of the present invention is reinforced over a wide range by using a plastic material having the same quality as the main body or an affinity with the main body as a reinforcing material. Therefore, it is a blow-molded product with extremely excellent dimensional accuracy and strength, and can be used for the other surface. In the present invention, when the main body and the reinforcing material are of the same quality, they can be collectively returned to the raw material, so that they can be reused very easily.

[Brief description of drawings]

FIG. 1 is an explanatory view of a manufacturing process of a bumper reinforcement.

FIG. 2 is a vertical sectional front view of a bumper rain hosement.

FIG. 3 is a sectional view taken along line aa and bb in FIG.

FIG. 4 is a perspective view in which a part of a body (floating pier) is cut away.

[Explanation of symbols]

1 parison 2 mold 3 Reinforcement material 4 body

Claims (4)

[Claims] 1. In a plastic blow molded product,
Blow-molded product that inserts a reinforcing material made of plastic that is compatible with the plastic material that composes the main body. 2. The blow-molded article according to claim 1, wherein the main body and the reinforcing material are made of a thermoplastic plastic material. 3. The plastic material constituting the reinforcing member and the plastic material constituting the main body are the same.
Or the blow molded article of 2. 4. The blow-molded article according to claim 1, wherein the reinforcing material and the plastic material of the main body are both polypropylene, polyethylene, or ABS resin.