ポリエチレン繊維の製造に関する研究

第5報 紡糸条件と紡糸状態との関係について

抄録

The effects of melt spinning conditions on the spinning aspects by a so-called candle spinning apparatus were investigated.
At the excessively high spinning temperature, molten polyethylene are decomposed by heat or air resulting in the decrease of the maximum draft on the spinning process. The polyethylene samples having smaller _??_n show larger maximum draft on melt spinning. The maximum draft of a sample having the _??_n of 41×10³ amounts to about one hundred at 180°C.
The maximum draft becomes smaller as the linear velocity of the molten polymer extruded through the capillaries of the spinneret becomes larger.
It is also discussed how the velocity of the molten polymer in the capillaries effect the expansion of the extruded molten polymer due to the relaxation of molecular chain orientation