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Shantou Longsheng FAQ: Sheet Thickness Tolerance and Finished Product Yield

Time: 2026-10-30 10:10:30.158

Why Tolerance Determines Yield

When thermoforming yield disappoints, the sheet is the suspect nine times out of ten. Forming depends on even heating and even stretching across the sheet; when thickness fluctuates, thin zones rupture first and thick zones never fully draw. Buyers often focus on the former, but the bottleneck is frequently upstream at extrusion.

Frequently Asked Questions

  • Q: What tolerance is acceptable for packaging sheet? A: Food packaging sheet typically requires within plus or minus 3 to 5 percent; precision packs such as yogurt cup sealing rims demand tighter control
  • Q: What causes cross-direction variation? A: Usually die gap settings, restrictor bar position and uneven die temperature across the width; recalibration is needed
  • Q: What causes down-direction variation? A: Commonly an unstable barrel temperature profile or pull-speed fluctuation; Longsheng's patented interval-heating technology reaches steady state faster
  • Q: Does regrind widen the tolerance? A: Yes. Regrind ratio and particle size must stay consistent so melt viscosity stays stable

Longsheng's Testing Practice

Every Longsheng line is trialed with real materials before shipment, with thickness data recorded so customers accept machines on evidence.

About Longsheng

Founded in 1998, Shantou Longsheng Industry Co., Ltd. is a certified high-tech enterprise. Learn more at https://www.stlongsheng.com

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