溶融プラスチックスの管内流動および吐出流について

DOI Web Site Web Site

書誌事項

タイトル別名
  • On the Pipe Flow and the Ejection of Molten Plastics
  • ヨウユウ プラスチックス ノ カンナイ リュウドウ オヨビ トシュツリュウ ニ ツイテ

この論文をさがす

抄録

Many experiments on the flow of molten polymers have hitherto been performed by means of relatively short capillary tubes. The static pressure of the flow is measured indirectly by the load of plunger. In this paper the results of experiments made with the use of comparatively long tubes-not capillary-are described. As for the pressure, the elastic deformation of the tube according to the static pressure of the flow was measured directly by the wire strain gage. Polyethylen and polypropyrene were used as testing materials.<br>The shearing stress vs. shear rate curve can be approximated by two straight lines as shown in Fig. 3. The shear rate at this crooked point of the flow curve corresponds to that of the maximum swelling ratio, and over the region of this shear rate appears the vibration of pressure.<br>The swelling mechanism by Barus effect was investigated by introducing the Voigt model after McIntosh, on the other hand, and it was assured that the experimental tendency had good agreement with the theoretical ones as shown in Fig. 5. So it seems that Barus effect can be explained by a modified Voigt model of Fig. 6. The flow rate at which the smooth figure of ejection is obtained is calculated from Eq. (10). The facts thus obtained by this study will serve as the design for dies of injection machine.

収録刊行物

  • 材料

    材料 16 (166), 557-561, 1967

    公益社団法人 日本材料学会

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ