BLOW MOLDING METHOD AND COMPACT PRODUCTION DEVICE

To provide a method of making transferability of a solid part excellent without using much time and labor and of resultantly preventing occurrence of sinks or the like.SOLUTION: A blow molding method includes steps of from a) to g). In the a), a parison P is injected between molds 30, 40, and in the...

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Bibliographische Detailangaben
Hauptverfasser: KUNICHIKA NORIYUKI, IKUMOTO AKIHIRO, TSUBOI HIROYUKI
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a method of making transferability of a solid part excellent without using much time and labor and of resultantly preventing occurrence of sinks or the like.SOLUTION: A blow molding method includes steps of from a) to g). In the a), a parison P is injected between molds 30, 40, and in the b), the molds 30, 40 are mold-closed. In the c), air is blown in the parison P to swell the parison P to molding surfaces 33, 41 side of the molds 30, 40. In the d), among the molding surfaces 33, 41, an action surface 71a that is a part of the molding surface on the first mold side corresponding to the solid part s14 is approached to an opposite surface 41a that is a part of the molding surface on a second mold side corresponding to the solid part s14. In the e), in a state where the solid part is not present in a part corresponding to the solid part s14, the parison P is brought into close contact with the molding surfaces 33, 41. In the f) air supply to the parison P is stopped. In the g), the mold is mold-opened and a compact is taken out.SELECTED DRAWING: Figure 2 【課題】多大な時間や手間を掛けることなく、中実部の転写性を良好にし、ひいてはヒケ等の発生を防止する。【解決手段】ブロー成形方法は、a)からg)までの工程を含む。a)では、パリソンPを金型30,40の間に射出し、b)では、金型30,40を型締めする。c)では、パリソンP内に気体を吹き込んでパリソンPを金型30,40の成形面33,41側へ膨出させる。d)では、成形面33,41のうち、中実部s14に対応する第1金型側の成形面の一部である作用面71aを、当該中実部s14に対応する第2金型側の成形面の一部である対向面41aに、接近させる。e)では、中実部s14に対応する部分において中空部分がない状態で、パリソンPを成形面33,41に密着させる。f)では、パリソンPへの気体の供給を停止する。g)では、金型を型開きして、成形品を取り出す。【選択図】図2