Extrusion & Post
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Insufficient strength of PP woven bag flat filaments
Problem Phenomenon
Flat filaments break frequently in the drawing process, and the tensile strength of finished woven bags does not meet the standard.
Cause Analysis
Insufficient draw ratio makes the molecular orientation inadequate; the drawing temperature deviating from the optimal range also makes the strength build-up insufficient.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Optimize the draw ratio to the process upper limit; ②control the drawing temperature; ③check the melt index matching of the raw material; ④test the linear density uniformity of the flat filaments.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
Flat filament strength is built by drawing orientation; drawing process parameters are the core variables of drawing quality.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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