成形加工
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
1 巻, 4 号
選択された号の論文の4件中1~4を表示しています
  • 青地 保光, 奥山 和彦
    1989 年 1 巻 4 号 p. 415-421
    発行日: 1989/10/20
    公開日: 2009/11/18
    ジャーナル フリー
  • 酒井 忠基
    1989 年 1 巻 4 号 p. 431-438
    発行日: 1989/10/20
    公開日: 2009/11/18
    ジャーナル フリー
    The combination of a non-intermeshed high speed type twin screw extruder and a single screw extruder has been used for a continuous two-stage graft-copolymerization reactor. A study on direct graft-copolymerization to commercial polymer manufactured with a conventional polymerization process has been carried out using Ethylene-Vinylacetate copolymer-Maleic Anhydride-Styrene monomer composition. As a result, the two-stage twin screw extrusion system has been shown to be useful as the continuous reactor for relatively low concentration grafting polymerization, and to rationalize considerably the manufacturing processes when compared with the conventional polymerization process. Furthermore, by taking into consideration the reaction temperature, reaction time and mechanical operating parameters, it was possible to control the structure of the grafted products and the production capacity for given monomer and initiator formulations.
  • 竹田 啓, 堀口 智, 小山 清人
    1989 年 1 巻 4 号 p. 439-446
    発行日: 1989/10/20
    公開日: 2009/11/18
    ジャーナル フリー
    An experimental study of the morphology and orientation of injection molded LCP and fiber/LCP composites was carried out. The LCP studied was a completely aromatic copolyester composed of 4-hydroxy-benzoic acid (HBA) and 2-hydroxy-6-naphtoic acid (HNA). The fibers were potassium titanate single crystal. The morphology and orientation of the samples were characterized by polarized optical microscopy, scanning electron microscopy, scanning acoustic microscopy, and wide angle x-ray diffraction. Four layers with different morphologies were observed along the thickness direction in molded samples of LCP and fiber/LCP composites. The crystallinity of each layer increased with increasing distance from the surface. The molecular orientation of the three outher layers was parallel to the flow direction, while that of the core layer was perpendicular to the flow direction. The fiber orientation of each layer was the same as the molecular orientation of the LCP. The fiber composites showed improved mechanical properties, such as bending modulus, strength, and interlaminar peel strength molded LCP plaques.
  • 西村 寛之, 宍戸 透, 仲倉 正博, 柴野 博, 北尾 幸市
    1989 年 1 巻 4 号 p. 447-455
    発行日: 1989/10/20
    公開日: 2009/11/18
    ジャーナル フリー
    This paper describes the application of the full-notch tensile fatigue (FNTF) test to fusion strength evaluation (butt, socket, saddle and electrofusion).
    When a full notch is made at the fusion interface in a joint, the fusion strength of the joint can be evaluated in the same manner as that of a substrate. While the conventional stress rupture test is not suitable for fusion interface strength measurement, our proposed method permits measurement of fusion strenth variation by means of the actual time to failure.
    Besides butt fusion strenth, the FNTF test method is applicable to the fusion strenth evaluation of various types of joints, determination of compatibility and selection of the optimum fusion conditions. The fusion strength correlates strongly with the melt flow rate of resin. The higher the melt flow rate is, the closer the fusion strength becomes to that of the substrate, providing a wider range of optimum fusion conditions. For butt fusion between two different brands of polyethylene, it is preferable to select resins having the same melt flow rate. The FNTF test method has already been specified in the JIS as one of the recommended evaluation methods for fusion joints.
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