农用硝铵改性后，熔融物料粘度大，含有固相悬浮颗粒，引起生产过程中喷头堵塞现象。
After modification of agricultural ammonium nitrate, the molten material has a high viscosity and contains solid suspended particles, leading to blockage of the prilling basket during production.
使用Poly flow软件对熔融物料在往复螺杆式注塑机螺杆头部计量段中的三维等温流场进行了数值模拟。
Three-dimension isothermal flows in the metering section of reciprocating screw injection machines are simulated using the finite element package POLYFLOW.
显而易见，只讨论熔体输送而不讨论物料熔融，对全面研究双螺杆挤出理论是很不够的。
It is obviously that only taking account of melt handling without considering material melting is not suitable to study twin screw extrusion theory thoroughly.
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