PE raw material: Food grade polyethylene must be used, in compliance with relevant food safety standards (such as Chinese GB 4806.7). Commonly used are LDPE (low-density polyethylene) and LLDPE (linear low-density polyethylene), with the latter having better strength and toughness.

Temperature control: Temperature zoning control of the extruder is crucial. Low temperature, uneven plasticization of PE, poor fluidity; Excessive temperature can cause degradation and oxidation of PE, resulting in odor and yellowing, affecting product performance and food safety.

Coating amount: Refers to the weight of PE coated per unit area, usually in grams per square meter. This is one of the most important technical indicators.

• Insufficient coating amount: It can lead to a decrease in leak prevention performance and easy leakage.
• Excessive coating amount: Not only does it waste materials and increase costs, but it may also cause the paper cup to become soft (reduce stiffness), and there may be quality problems during curling and cup bottom forming.

Typical range: Single sided coating is usually between 12-22 gsm, with higher requirements for hot beverage cups.