Two-stage process for making foam mouldings from tube blanks
    1.
    发明授权
    Two-stage process for making foam mouldings from tube blanks 失效
    从管坯制造泡沫塑模的两阶段工艺

    公开(公告)号:US5955015A

    公开(公告)日:1999-09-21

    申请号:US817915

    申请日:1997-06-09

    CPC分类号: B29C44/08

    摘要: A technique of producing polyolefin foam is described. A two-stage process is described wherein the first stage involves expanding a preformed cylindrical tube comprising a polymer, blowing agent, cross-linking agent and blowing agent activator in an enclosed cylindrical mold. The cylindrical mold constrains the expansion of the foam without the need for hydraulic rams or similar mechanical means as are found in conventional platen presses. Following stage one, the cylindrical tubes of material are heated while unconstrained and expands symmetrically. The cylindrical tube of expanded foam material is then slit and may be cold pressed in order to form polyolefin foam blands. Variations on the cylindrical tube mold shape may be used and patterns and other features may be formed on the interior of the cylindrical mold in order to produce a product containing the imprint thereof. Polyolefin foam so produced may be used in building, packaging, clothing and similar applications.

    摘要翻译: PCT No.PCT / NZ95 / 00102 Sec。 371日期:1997年6月9日 102(e)日期1997年6月9日PCT提交1995年10月10日PCT公布。 公开号WO96 / 11096 日期1996年4月18日描述了生产聚烯烃泡沫塑料的技术。 描述了两阶段方法,其中第一阶段涉及将包含聚合物,发泡剂,交联剂和发泡剂活化剂的预制圆柱形管扩大到封闭的圆柱形模具中。 圆柱形模具限制泡沫的膨胀,而不需要液压柱塞或类似的机械装置,如在常规压板机中发现的那样。 在第一阶段之后,材料的圆柱形管被加热而不受限制并且对称地膨胀。 然后将膨胀泡沫材料的圆柱形管切割并且可以被冷压以形成聚烯烃泡沫模具。 可以使用圆筒形管形状的变化,并且可以在圆柱形模具的内部上形成图案和其它特征,以便制造包含其压印的产品。 如此生产的聚烯烃泡沫可用于建筑,包装,服装和类似应用。