Processing Machinery
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Wide temperature window of low density polyethylene PE raw material causing process parameter optimization difficulty
Problem Phenomenon
PE materials have a wide processing temperature range (160-220°C); in actual operation there is a lack of basis for selecting the optimal temperature.
Improper temperature selection harms energy consumption, product quality, and production efficiency.
Cause Analysis
(1) Different PE grades have different optimal processing temperatures
(2) Temperature setting lacks systematic methods
(3) Operators set temperature based on experience
(4) Temperature not optimized according to product characteristics and quality requirements
(5) The matching relationship between temperature and screw rotation speed is unclear
Solution
(1) Establish a processing temperature database for each PE grade
(2) Optimize the temperature of each zone through design of experiments (DOE)
(3) Appropriately increase temperature for thin-wall products to improve flowability
(4) Appropriately reduce temperature for thick-wall products to reduce shrinkage
(5) Standardize temperature adjustment records, establish optimal process parameter archives
Key Takeaway
PE temperature window optimization needs to be advanced from two aspects: systematic experiments and experience accumulation.
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