Metallized PET Film Blocking on the Roll

Metallized PET Film blocking occurs when adjacent layers resist separation during unwind. It can create tension spikes, web breaks, metal marking and registration changes even when the roll looked normal at receiving.

A Metallized Film Supplier needs the roll age, storage temperature, stacking method, unwind speed and the depth where blocking begins. These details separate storage pressure from winding or surface causes.

Map the Blocking Pattern

Note whether sticking occurs on outer wraps, through the roll or near the core. Retain samples from free and blocked areas. Inspect metal appearance, scuffing and transfer separately.

Review Pressure and Heat

High temperature, prolonged compression and uneven winding can increase layer contact. Record pallet orientation, stacking load, transport exposure and roll hardness across the width.

Correct without Damaging the Web

Do not solve blocking only by increasing unwind force. Trial controlled acclimation and tension, then inspect the laminate. Send Cailong labels, storage records, unwind video and defect samples.