成形加工
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
16 巻, 1 号
選択された号の論文の30件中1~30を表示しています
目次
巻頭言
新春座談会
成形加工シンポジア '03 報告
第 11 回秋季大会を終えて
大会講演・討論を聞いて(セッション報告) : 特別セッションⅠ、Ⅱ、Ⅲ、Ⅳ、Ⅴ、Ⅵ、Ⅶ、一般セッション
特集 成形加工シンポジア '03 報告
解説 : 特集 成形加工シンポジア '03 特別講演より
技術報告
日本の大学・試験・研究機関の研究 : 123
会議・見本市だより
知りたい・見たい・訪ねたい成形加工の元気な仲間
論文
  • 安田 健, 田上 秀一, 家元 良幸
    2004 年 16 巻 1 号 p. 50-57
    発行日: 2004/01/20
    公開日: 2009/11/18
    ジャーナル フリー
    The properties of polymer melts are different from those of monomeric materials because polymer materials have crystalline and amorphous regions. In addition, polymer melts exhibit elasticity as well as viscosity. Therefore, the viscoelasticity, crystallinity and temperature of polymer melts must be considered for an accurate simulation of the melt spinning process for crystalline polymers. In this study, we simulated the melt spinning process of Nylon-6 by using the streamline-upwinding finite element method. The non-isothermal Phan-Thien Tanner model proposed by Sugeng and Phan-Thien was employed as a constitutive equation. We investigated the distribution of temperature and crystallinity on the free surface of the filament, and the filament diameter.
    The calculations were nearly independent of gravity. The primary normal stress increases and the filament diameter decreases with an increase of take-up speed. The filament diameter obtained by the non-isothermal flow simulation is smaller than that for the isothermal case, and the filament diameter depends on the crystallinity. The filament shape for a purely viscous fluid is the same as that for a viscoelastic one.
  • 野村 学, 大西 陸夫, 藤村 剛経, 濵田 泰以
    2004 年 16 巻 1 号 p. 58-63
    発行日: 2004/01/20
    公開日: 2009/11/18
    ジャーナル フリー
    Glass-fiber (GF) reinforced polypropylene (PP) is a very important industrial material. However, as PP is a non-polar polymer, the interfacial adhesion strength between PP and GF is very weak. In order to resolve this problem, maleic acid grafted PP (MA-PP) is generally used. In this way the tensile strength of GFPP can be improved remarkably. Moreover long glass-fiber reinforced PP pellets for injection molding have been recently developed. In spite of these improvements, the strength of GFPP still lags those of other GF reinforced engineering plastics. In order to improve the strength of GFPP, it is necessary to reinforce the weakest of the many interfaces and interphases in the GFPP system. It was found that the interface between the malefic acid grafted PP and the neat matrix PP is the weakest layer. Thus, to reinforce this interface, it is important to increase the entanglement between the MA-PP and PP molecules. It was found that the strength of GFPP could be improved by using high molecular weight MA-PP.
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