Blown-film slip and antiblock: begin with the finished roll
When a film opens poorly or blocks after storage, we first inspect the roll rather than judging the additive from one friction value. Winding tension, surface feel and the interval between production and bag making often explain part of the change.
Film processing note
When a film opens poorly or blocks after storage, we first inspect the roll rather than judging the additive from one friction value. Winding tension, surface feel and the interval between production and bag making often explain part of the change.
We compare rolls under the same handling conditions and record the resin, layer structure, thickness, output and dosage before altering the formula. This shows whether the issue appeared at extrusion, winding, storage or downstream conversion.
What to send for a film review
A one-metre film sample from the affected roll and a normal roll is usually enough for the first review. Mark the machine direction and include the production date, formulation, winding condition and the point at which opening became difficult.