Molecularly oriented plastic band as well as a method and apparatus for producing the same

摘要

A method in which a band formed of essentially unoriented thermoplastic polymeric material is provided with a transverse cross-section which is of corrugated configuration and is generally uniform in thickness, with at least portions of such band being compressed so as to orient polymer molecules in the transverse direction of the band, afterwhich the band is elongated to orient polymer molecules thereof also and predominantly in the longitudinal direction of the band. The resulting strapping possess a high tensile strength, improved resistance to longitudinal splitting, good longitudinal stiffness, a reduced tendency to shell when wound as a roll, reduced surface abrasion during transit through strapping equipment and provides for high strength heat seals.