Mono-axially stretched polypropylene film with a high tear resistance in the cross direction

摘要

Polypropylene film monoaxially oriented in the longitudinal direction comprises a nucleating agent homogneeously distributed within the film. An independent claim is also included for producing film as above by mixing polymers and additives, feeding the mixture to a flat film die in an extruder in which the nucleating agent is added homogeneously to the polypropylene, cooling the melt film on a chill roll, heating the film to stretching temperature on heated rolls, and orienting the film in the machine direction in a short nip.