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US5435964A Parison forming method and apparatus therefor 失效
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Parison forming method and apparatus therefor
摘要:
A parison molding method and its apparatus in which at least two kinds of materials are used, and the layer formation and dispersion are uniform in the weld part and in the circumferential direction. In the parison molding method and its apparatus, molten resin at a weld part within a parison head is discharged out of the parison head by way of a flow control valve.
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