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    • 23. 发明授权
    • Method for producing polypropylene resin article having skin material
lined with foamed layer
    • 生产聚丙烯树脂制品的方法,该制品具有内衬泡沫层的表层材料
    • US5281376A
    • 1994-01-25
    • US775107
    • 1991-10-11
    • Takahisa HaraMasahito MatsumotoNobuhiro UsuiShigeyoshi Matubara
    • Takahisa HaraMasahito MatsumotoNobuhiro UsuiShigeyoshi Matubara
    • B32B5/20B29C39/10B29C43/18B29C43/36B29C43/58B29C44/04B29C44/14B29K23/00B29K105/04B29C67/22
    • B29C44/0415B29C44/10B29C44/146B29C44/381
    • A multi-layer molded article which is made of a polypropylene resin body and a skin material lined with a foamed layer and has good appearance is produced by using molds between which a cavity clearance is freely set, placing a skin material lined with a foamed layer between the upper and lower molds and supplying a molten polypropylene resin containing a chemical blowing agent through a resin melt conduit in the lower mold when cavity clearance (t) is between (C+15) mm and (C+50) mm where "C" is a thickness of the skin material lined with the foamed layer, lowering the upper mold at a specific rate and pressing the molten resin at specific pressure to fill cavity ends with the molten resin to complete molding of a body of the resin, pressing the body for a certain time after completing molding to form a skin layer, lifting up the upper mold to decrease a compression pressure of the skin material lined with the foamed layer to a pressure lower than a blowing pressure of the polypropylene resin to form and solidify a foamed body, and again lowering the upper mold to apply a certain pressure on a molded article and cooling the article in the molds.
    • 通过使用空腔间隙自由设定的模具制造由聚丙烯树脂体和内衬有发泡层并具有良好外观的表层材料制成的多层成型制品,将内衬有发泡层的表层材料 在上模和下模之间,当空腔间隙(t)在(C + 15)mm和(C + 50)mm之间时,通过下模具中的树脂熔体导管供应含有化学发泡剂的熔融聚丙烯树脂,其中“C “是用发泡层衬里的表层材料的厚度,以特定的速率下降上模,并在特定压力下按压熔融树脂以用熔融树脂填充空腔端部,以完成树脂体的模制, 在完成成型之后一段时间以形成表皮层,提起上模具以将发泡层衬里的表皮材料的压缩压力降低到低于聚丙烯吹塑压力的压力 以形成和固化泡沫体,并且再次降低上模以对模制品施加一定压力并将模具中的物品冷却。