| 摘要 |
A cleaning sheet ( 29 ) is formed with a trough-hole ( 29 a) at a portion corresponding to a cavity of a mold along with a slit ( 29 b) or a flow cavity cut ( 29 c) at every corner at an outer periphery of the through-hole ( 29 a) and is placed between a first mold half and a second mold half of the mold to clean the inside of the mold, thereby improving the cleaning effect of the mold.
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