JP2813927B2 - Blow molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

[0003]

Although it is possible to form a thick wall by appropriately manipulating a mold within a very narrow range, it is not suitable for reinforcing a large molded product over a wide range. For this purpose, a large molded product is reinforced by bonding or screwing a reinforcing material such as metal. However, there have been many troubles due to breakage from the reinforced portion and a difference in material. Accordingly, there is a strong demand in various fields for a method of obtaining a reinforced molded product over a wide range in a blow molded product, particularly a large blow molded product, and for the development of a blow molded product reinforced by the method.

[0004] Conventionally, there has been a blow molded product in which a small metal member is inserted for the purpose of connection with other components, but a metal having a sufficient size has not been inserted for the purpose of reinforcement. 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). No. On the other hand, in recent years, products that integrally mold plastics having different properties (soft plastic and rigid plastic) and utilize the difference in properties have been provided (for example, automobile ducts using hard plastic and soft plastic). However, these are intended only to form a curved portion integrally by utilizing the difference in properties, and are not intended to reinforce, and furthermore, there is a problem of the risk of peeling or deformation due to the difference in material. Is still unresolved.

[0005]

Means for Solving the Problems In the blow molding, the present inventors insert a reinforcing material preformed using a plastic material compatible with the plastic material constituting the main body at the time of blow molding of the main body. As a result, the above problem was successfully solved.

That is, the present invention provides a blow-molded article of a plastic, in which a reinforcing material made of a plastic having an affinity for a plastic material constituting a main body is inserted, and the reinforcing material is at least partly in a longitudinal direction. At which the perimeter is completely wrapped in the body plastic material, and the entire reinforcement is buried in the contour of the body structure ,
Longitudinal direction of the reinforcement between the outer contour of the body structure and the reinforcement
The present invention provides a blow-molded product having ribs formed along the line .

[0007] As the plastic material of the blow molded product of the present invention, various materials used in the technical field 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 a reinforcement for each other.

For the purpose of the present invention, it is particularly preferable that the plastic material of the main body is any of the above-mentioned plastic materials and the reinforcing material is formed of the same plastic material as the plastic constituting the main body. Among them, polypropylene, polyethylene, and A
BS resin is preferred. In the case of the same material, the affinity is particularly high, the dimensions of the product are maintained, and there is no possibility of peeling, so that a useful reinforced plastic molded product can be obtained. Moreover, there is an advantage that the plastic molded product can be reused. Conventionally, the reuse of various plastic products has been hindered due to the inability to separate constituent materials. According to the present invention, such a problem can be solved. Therefore, the above is a very important advantage when considering the effective use of resources.

[0009] Blow molded articles of the present invention can be produced by using a blow molding method using a known insert material to those skilled in the art. When the parison is lowered, a plastic reinforcing material molded in an appropriate size in advance is sandwiched by a mold on the side to be reinforced, and inserted into the main body at the same time as blow molding. In this case, by appropriately adjusting the length and width of the inserted reinforcing material, a reinforced molded product suitable for the intended use can be obtained.

[0010]

According to the present invention, a plastic material which is the same as or has affinity with the main body can be inserted into the main body as a reinforcing material, so that a bumper beam, a side door beam, a seat frame, a floor panel, a floating bridge of an automobile can be used. Blow molded products with high dimensional accuracy and high 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, there is no need to sort this into various materials,
Since it can be reduced to raw materials in a lump, its reuse is extremely easy.

[0011] The blow molded article of the present invention has an outer shape of a main body structure.
A rib along the longitudinal direction of the reinforcement between the contour and the reinforcement
Is formed. Therefore, in addition to the reinforcing effect of the reinforcing material,
This rib has a reinforcing effect, especially on the rib surface.
It exerts a large reinforcing effect on loads in the right direction.

[0012]

【Example】

Example 1: bumper hose reinforcement (bumper beam for an automobile) Figure 1 shows a reinforced bumper hose reinforcement of the molding process. In the figure, 1 is a parison, 2 is a mold, and 3 is a reinforcing material. 1) The mold 2 contains a reinforcing material. 2) The parison 1 is lowered and the mold 2 is separated (Fig. 1).
The state transitions from A) to the state in which the mold 2 is closed (FIG. 2B). 3) As usual, molding is performed while blowing air from a lower air blowing port. 4) The reinforcing material 3 sandwiched between the molds 2 is inserted into the parison 1. 5) When the mold 2 is released, a bumper reinforcement in which the reinforcing material 3 having a desired length is inserted into the main body 4 is obtained. FIG. 2 is a sectional view of the molded article. 3A is a cross-sectional view of the bumper reinforcement of FIG. 2 taken along the line a-a, and FIG.
It is b sectional drawing.

[0013] The bumper rain hose
In the embodiment, a supplement is provided between the reinforcing member 3 and the outer contour of the main body structure 4.
A cylindrical rib 5 and a plate-like rib 6 along the longitudinal direction of the strong material 3
Are formed alternately (see FIG. 3), and these are
For lateral loads (specifically, collision from the left)
Shows great reinforcement effect.

[0014] Example 2: box body (floating piers) in substantially the same manner as described above in Example 1 for forming the box body by blow molding. This is used as a floating pier. FIG. 4 is a perspective view in which a part of the box is cut away. In the figure, 7
Is a reinforcing material, and 8 is a main body. In this embodiment of the box,
Between the reinforcing member 7 and the outer contour of the main body structure 8
A plate-like rib 9 is formed along the longitudinal direction,
It shows a large reinforcing effect against the load from.

[0015]

[Effect] In the blow molded article of the present invention, the reinforcing material is long.
In at least a part of the hand direction,
Fully wrapped in the backing material and the entire stiffener body structure
Is buried within the outer contour of the
It will be held firmly, and the external shape by the main body
Does not impair. And, such a structure or et al., Complement
The strong material is in a state protected by the main body structure,
Even if it is added, it is possible to prevent cracks and the like from occurring in the reinforcing material.
Further, the length of the reinforcing material is located between the outer contour of the main body structure and the reinforcing material.
Because the ribs are formed along the hand direction,
In addition to the reinforcement by the reinforcing material, the reinforcement effect by this rib is obtained.
Can be

The blow-molded article of the present invention is reinforced along the longitudinal direction of the reinforcing material by using a plastic material having the same quality or affinity as the main body as the reinforcing material. Therefore, it is a blow molded product having extremely excellent dimensional accuracy and strength, and can be used in various fields. In the present invention, when the main body and the reinforcing material are of the same quality, they can be collectively reduced to the raw materials, so that it is extremely easy to reuse them.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional front view of a bumper rain hose.

FIG. 3 is a sectional view taken along aa and bb in FIG. 2;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Parison 2 Die 3 Reinforcement 4 Body

Continuation of the front page (72) Inventor Kenichi Akamatsu 447, Shimoichi, Sanyo-cho, Akaiwa-gun, Okayama Prefecture (56) References JP-A-59-103725 (JP, A) JP, A)

Claims (4)

(57) [Claims] 1. A blow-molded product obtained by inserting a reinforcing material formed of a plastic having an affinity for a plastic material constituting a main body, wherein the reinforcing material has at least a part in a longitudinal direction around the main body plastic. Completely wrapped in the material and the entire stiffener is buried within the outer contour of the body structure, and furthermore the stiffener between the body structure and the stiffener
A blow-molded article characterized in that a rib is formed along a longitudinal direction of the blow-molded article. 2. The blow-molded article according to claim 1, wherein the main body and the reinforcing member are made of a thermoplastic plastic material. 3. The blow-molded article according to claim 1, wherein the plastic material constituting the reinforcing member and the plastic material constituting the main body are the same. 4. A reinforcing material and body plastic material <br/> polypropylene, polyethylene or ABS resin Neu,
The blow-molded article according to any one of claims 1 to 3, which is misaligned .