Plate shape body transport box, foam forming method and foam forming device

Abstract

A plate-like body carrying box is provided, including a thermoplastic resin foam body and lid body formed of foam beads of a thermoplastic resin, in which the body has a depth of more than 400 mm, a plurality of grooves for supporting the plate-like bodies are formed at least in a set of facing inner side surfaces of inner side surfaces are formed in the vertical direction, the grooves are formed in a taper of 1 / 1,000 to 5 / 1,000 from a slightly wide opening side to a slightly narrow bottom part side. In the foam forming method of box foam forming, middle molds contacting with a core mold and forming drafts with the core mold are first provided on at least one pair of side surfaces in the opposing surfaces of the core mold, and after a foamed body is formed the middle molds are forced to move a short distance along the drafts between the middle molds and two side surfaces of the core mold under the condition that the foamed body and a cavity mold will not separate, and after that the foamed body together with the cavity mold are pulled out of the core mold while the middle mold is prohibited from moving and finally finished the mold release. A foam forming apparatus for forming the foam-formed box is provided.

Description

technical field [0001] The invention relates to a transport box for a plate-shaped body, in more detail, to a transport box suitable for stable loading of high-precision substrates such as plasma displays. In addition, it relates to a foam molding method and a foam molding apparatus for a box-shaped foam-molded product such as a plate-shaped transport box. Background technique [0002] A conventional plate-shaped transport box for transporting substrates such as high-precision plasma displays one by one in a groove is described in, for example, Japanese Patent No. 2552625. [0003] The transport box is made of synthetic resin foam, and longitudinal grooves capable of loading plasma display substrates (hereinafter referred to as PDP substrates) etc. one by one are formed on a group of opposite inner sides of the box inner sides. This kind of box is no problem for a shallow box, but for a deep box used for a large PDP substrate, due to the draft angle during molding, the uppe...

AI Technical Summary

Problems solved by technology

This kind of box is no problem for a shallow box, but for a deep box used for a large PDP substrate, due to the draft angle during molding, the upper and lower dimensions of the groove are very different, so it is difficult to mount the PDP substrate stably. In, the PDP substrate is not aligned during transportation, or only the lower part of the PDP substrate is in contact with the groove wall at the narrow part of the bottom groove, and the contact area is concentrated in a certain part, causing damage, dust absorption, or foam molded products friction to produce broken powder , which may have a bad effect on the performance of the PDP substrate

Therefore, it is necessary to remove the draft angle, or to remove the draft angle as much as possible, but the existing foam molding cannot meet this requirement

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