Extrusion & Post
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LCP Blown Film Process and Bubble Stability
Problem Phenomenon
【Problem Phenomenon】The LCP blown film bubble is unstable with uneven thickness, and the film bubble easily shakes and ruptures
Cause Analysis
LCP has low melt strength and fast crystallization, the bubble cooling and solidification window is narrow, and uneven air ring cooling immediately causes thickness fluctuation; both the Buffalo review and the Celanese guide record that blown film is an effective way to reduce LCP film anisotropy, but the process is difficult
Solution
Improve melt temperature uniformity and precisely control the air ring temperature; use collapsing frames and rotating haul-off to even out thickness; adjust the blow-up ratio and draw ratio to match so that longitudinal and transverse properties are balanced
Key Takeaway
LCP blown film focuses on temperature control and biaxial orientation balance; bubble stability comes from uniform cooling; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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