硬質塩化ビニルの押出し成形に関する研究 : 第1報, 簡単な単軸スクリュ式押出し機内の樹脂流動状況

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タイトル別名
  • Research of Hard PVC Extrusion : 1st Report, States of Plastic Flow in Extruder, Single Screw Type
  • コウシツ エンカビニル ノ オシダシ セイケイ ニ カンスル ケンキュウ 1

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抄録

Generally it is reported that the plastic flow in an extruder of single screw type, is a combination of drag flow, pressure flow and transverse flow, ignoring leakage flow. However, in case of hard vinyl chloride, the substance filling up the screws was taken out from several machines and examined and it was found that there was no such flow as mentioned above, but the pressure flow along the back side of the screws. It can be explained that this phenomenon happens, because of the pressure difference between the front and back of screw threads, on the assumption that at the solid part the friction between particles or between particle and wall is proportional to the pressure and at the molten part the friction against the wall is proportional to the relative velocity, and also because of Bingham fluid at molten part. As a result the flow along the back of screw thread is called pressure slip flow or vacuum flow, because it is considered that the flow is caused by the vacuum at the back of screw thread.

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