| 摘要 |
PROBLEM TO BE SOLVED: To not only make wear-resistance excellent but also reduce generation of dust by making use of a foamed body with a wear degree satisfying a specific value, for of pre-expandable particles of a thermoplastic polyester resin, in a substrate-holding part. SOLUTION: In a container main body 1 consisting of parts integrally formed by expansion molding pre-expandable particles of a thermoplastic polyester resin within a mold, it is necessary that a wear degree M be in the range of 0.1 g/100 cm2 or less. In the case of the wear degree M exceeding the range, a large amount of dust caused by wear is generated when impact as in a cutting manner is repeatedly applied by a sharp portion such as a corner of a substrate, and the dust results in frequent occurrences of substrate failure and breakdown. The smaller the wear degree M is, the more preferable it is, especially, it is preferable to be 0.07 g/100 cm2 or less and, in particular, 0.04 g/100 cm2 or less. The lower limit is 0 g/100 cm2. No generation of dust is ideal. However, even if dust is generated, there is no practical problem as long as the wear degree is within the above range.
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