Stock material or miscellaneous articles – Structurally defined web or sheet – Nonplanar uniform thickness material
Patent
1978-04-26
1979-05-01
Silverman, Stanley S.
Stock material or miscellaneous articles
Structurally defined web or sheet
Nonplanar uniform thickness material
24 16PB, 428906, 428910, B32B 328
Patent
active
041524756
ABSTRACT:
A strapping formed of thermoplastic polymeric material having a transverse cross-section which is of generally uniform thickness and of corrugated configuration, with polymer molecules thereof oriented along biaxial directions and predominantly in the longitudinal direction of such strapping. This 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.
Manufacture of this strapping is by a method and apparatus 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, after which the band is elongated to orient polymer molecules thereof also and predominantly in the longitudinal direction of the band.
REFERENCES:
patent: 3066366 (1962-12-01), Wyckoff et al.
patent: 3104937 (1963-09-01), Wyckoff et al.
patent: 3283378 (1966-11-01), Cramton
patent: 3354023 (1967-11-01), Dunnington
patent: 3447207 (1964-06-01), Danzer
patent: 3582453 (1971-06-01), Sloan et al.
patent: 3746608 (1973-07-01), Takahashi
patent: 3777334 (1973-12-01), Countryman
patent: 3955246 (1976-05-01), Tanuba
FMC Corporation
Horsky Eugene G.
Silverman Stanley S.
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