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    • 5. 发明申请
    • DEVICE FOR MOULDING A PLASTIC COMPONENT HAVING AT LEAST ONE UNDERCUT
    • US20170144340A1
    • 2017-05-25
    • US15321503
    • 2015-06-26
    • MECAPLAST FRANCE
    • Joseph QUERESébastien HUCKAurore CLAVERIE
    • B29C44/58B29C44/38
    • B29C44/582B29C44/388B29C44/586B29K2995/0064
    • Device for moulding a plastic component having at least one undercut. The device (100) for moulding a plastic component (15) from a plastic comprising a dissolved gas comprises:—a fixed block (1) comprising a first half-cavity (2) and a mobile block (3) comprising a second half-cavity (4), the fixed block (1) and the mobile block (3) joining along a joining plane (5) and the first and second cavities (2, 4) delimiting a moulding cavity (6) designed to receive the plastic, having a first volume (7) and having a main direction of demoulding (8),—means (28) of separating the mobile block (3) from the fixed block (1), allowing the moulding cavity (6) to be changed from the first volume (7) to a second volume (9);—at least one mobile insert (11) placed in the fixed block (1) bearing at least one mobile element (16′, 25), thrusting means (24) urging the mobile insert (11) toward the mobile block (3), the thrusting means being configured so that the mobile insert (11) accompanies the separation of the mobile block (3) between the first (volume (7) and the second volume (9), keeping the separation between the second half-cavity (4) formed in the mobile block (3) and the mobile element or elements (16′, 25) borne by the mobile insert (11) constant,—means of moving the mobile element or elements (16′, 25) in a secondary direction not parallel to the main direction of demoulding during complete opening.
    • 10. 发明申请
    • EXPANDED POLYPROPYLENE COPOLYMER RESIN PARTICLES
    • 膨胀聚丙烯共聚物树脂颗粒
    • US20120029101A1
    • 2012-02-02
    • US13262495
    • 2010-03-30
    • Kenichi Senda
    • Kenichi Senda
    • B29C44/38C08J9/22C08F210/06
    • C08J9/18C08J9/232C08J2203/06C08J2323/14
    • Disclosed is an expanded polypropylene copolymer resin particle whose base resin is a polypropylene random copolymer resin having a melting point of not more than 145° C., the base resin having a H/W ratio of not more than 8 where H (%) is a maximum height of an elution peak and W (° C.) is a peak width at half a height of the peak in an elution curve obtained from a differential value of eluted content measured by cross fractionation chromatography, and a ratio (Mw/Mn) of a weight-average molecular weight (Mw) and a number-average molecular weight (Mn) being not less than 3.5 in a molecular weight distribution measurement of a whole of eluted components. With such an expanded polypropylene copolymer resin particle, it is possible to provide expanded polypropylene copolymer resin particles which are capable of producing an in-mold expansion-molded article with a low molding heating vapor pressure, and which causes few deformation or shrinkage of an obtained in-mold expansion-molded article (i.e. having a broad molding heating temperature range) even if the in-mold expansion molding is carried out with a high molding heating vapor pressure and has a low decrease in physical properties such as compression strength.
    • 公开了一种发泡聚丙烯共聚物树脂颗粒,其基础树脂是熔点不大于145℃的聚丙烯无规共聚物树脂,H / W比不大于8的基础树脂,其中H(%)为 洗脱峰的最大高度和W(℃)是从通过交叉分级色谱法测定的洗脱物含量的差异值得到的洗脱曲线中峰的高度的峰宽度,Mw / Mn )在全部洗脱组分的分子量分布测量中的重均分子量(Mw)和数均分子量(Mn)不小于3.5。 使用这种发泡聚丙烯共聚物树脂颗粒,可以提供能够制造模制加热蒸汽压低的模内发泡成型制品的发泡聚丙烯共聚物树脂颗粒,并且所得到的聚丙烯共聚物树脂颗粒几乎没有变形或收缩 模内发泡成型体(即,具有宽的成型加热温度范围),即使模内发泡成型是以高的成型加热蒸气压进行,物理性能如压缩强度的降低也低。