Extrusion & Post
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LLDPE Blown Film Poor Plasticization (Unmelted Particles)
Problem Phenomenon
White unplasticized particle points appear on the film surface, especially obvious on stretch film.
Cause Analysis
LLDPE has high viscosity and is difficult to plasticize, and ordinary screws with insufficient mixing produce unmelted particles; they appear in batches when output is too high beyond the plasticization capacity.
Solution
① Use a special screw with barrier section + mixing section; ② reduce output or raise barrel temperature; ③ use finer filter screens to intercept; ④ check screw wear.
Key Takeaway
LLDPE has the highest requirements for screw mixing, and ordinary screws are not enough.
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