JPS5914182Y2 - Reinforcing core material for plastic hollow molded products - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reinforcing core material for plastic hollow molded products such as containers.

Plastic products have various advantages and are used in various fields, but they have drawbacks such as difficulty in shaping containers with specific internal structures, general deformation, and lack of sufficient strength. There is.

Various reinforcing materials and shaping materials have been developed to overcome these drawbacks.

The object of the present invention is to provide a reinforcing core material that can effectively reinforce a plastic hollow molded product.

When molding a plastic product, the reinforcing core material according to the present invention is first installed in a mold perpendicularly or obliquely to the inner wall of the mold, a plastic molding material is supplied into the mold, and a predetermined molding method, e.g. By molding by blow molding, a kind of bag-like internal part is formed inside the plastic hollow molded product, and the reinforcing core material is embedded therein, thereby giving the interior of the hollow molded product a desired shape such as a baffle. At the same time, the purpose is to ensure the necessary bond between the two and to improve the strength of the hollow molded product.

Conventionally, plate-shaped insert members used for reinforcing plastic molded products generally had a smooth surface, so plate-shaped insert members had poor adhesion to plastic molded products, resulting in a short period of time after the molded product was manufactured. However, there were drawbacks such as the plate-shaped insert member separating within the wall of the plastic hollow molded product in which it was embedded, resulting in loss of reinforcing effect and cracking of the molded product.

This invention eliminates the above-mentioned drawbacks, and also prevents the occurrence of concentrated stress at the tip of the reinforcing core material, which causes cracks in plastic hollow molded products, and uneven thickness of molded products, especially in sharply curved parts. The purpose of the present invention is to provide a reinforcing core material for plastic hollow molded products that has the following effects.

Hereinafter, the present invention will be explained based on the drawings.The present invention includes ribs 2a protruding from the surface 2 of the main body 1 made of plastic, and one end of the edge 3 of the main body 1 having a thick wall portion 4a.
This invention provides a reinforcing core material for a plastic hollow molded product, characterized in that the other end is formed into a thin wall portion 4b.

FIG. 3 shows the cross-sectional shape of a device in which one side of the periphery is formed as a thick wall portion 4a, and the other opposing side portion is formed as a thin wall portion 4b.

For comparison, FIG. 4 shows a corresponding portion of a reinforced core material of equal thickness.

When the reinforcing core material shown in Figure 3 is installed in a mold with its thick part as the base, orthogonal or oblique to the inner wall of the mold, and then the plastic is supplied into the mold, the reinforcing core material of equal thickness shown in Figure 4 Compared to the case of molded materials, it is possible to obtain the effect that uneven thickness is less likely to occur, especially in sharply curved parts of the molded product.

Furthermore, by forming the thin wall portion into a truncated shape rather than a sharp end, cracking due to the occurrence of concentrated stress at the tip can be prevented, and the molded product and the insert member will fit better.

Note that the various aspects described above can be combined as appropriate depending on the purpose of use.

Here, the best material for the main body is plastic in terms of compatibility with the molded product and adhesion.

However, even in the case of metal or wood, effects similar to those described above can be obtained if a coating of rubber, elastic plastic, or the like is applied to make the material compatible with the molded product.

Next, to install the reinforcing core material in the mold, it is inserted into the holder pin 5 as shown in FIG. Because I will do it,
The reinforcing core material can be completely embedded internally from the outer wall of the hollow molded product toward the inside of the molded product, and if necessary, the retained base can be inserted from the hollow molded product during molding. It can also be made to protrude and used as a fitting protrusion or a non-slip protrusion.

The holder pins are removed once the plastic hollow molded product is completed, so no unnecessary parts remain in the molded product, and if necessary, the punched holes can be used for connection to other utensils, or if necessary, they can be made from the same material. It should be blocked with

Therefore, according to the present invention, the contact area between the plastic hollow molded product and the reinforcing core material is expanded, and the two are fixed in an interlocking manner, which improves the compatibility between the two and improves the adhesion of the two. However, it can be expected to have a good anchoring effect, that is, a fixing effect, and can be effectively used as a reinforcing core material for plastic hollow molded products.

In addition, it has excellent effects such as preventing molded products from cracking and producing defective products, and can produce durable molded products.

Furthermore, the present invention is characterized in that it can strengthen plastic molded products, prevent uneven thickness of molded products, prevent concentrated stress at the tip, and shape the interior of containers.

It is extremely effective to apply the reinforcing core material of the present invention, especially when manufacturing tanks that require a base or baffle to be provided in the hollow part.

[Brief explanation of drawings]

Figures 1 and 2 are front views of the present invention, Figure 3 is a longitudinal sectional view thereof, Figure 4 is a longitudinal sectional view of the conventional one, and Figure 5 shows the invention mounted in a mold with a holder pin. FIG. 1...Main body, 2...Surface, 2a...
...Rib, 3...Edge, 4a...Thick wall part, 4b...Thin wall part, 5...Holder pin, 6... ···Mold.

Claims (1)

[Scope of utility model registration request] A rib 2a is provided protrudingly on the surface 2 of the main body 1 made of plastic, and one end of the edge 3 of the main body 1 is formed into a thick wall portion 4a.
A reinforcing core material for a plastic hollow molded product, characterized in that the other end is formed into a thin wall portion 4b.