Textiles: cloth finishing – Expanding device for textile webs – Biaxial expansion
Patent
1985-03-22
1986-12-02
Lowe, James
Textiles: cloth finishing
Expanding device for textile webs
Biaxial expansion
2642902, B29C 5500
Patent
active
046253726
ABSTRACT:
An apparatus is disclosed for the fabrication of a biaxially stretched flat film of thermoplastic material, particularly of polypropylene, with improved properties for a process in which the material is first partially pre-stretched in a longitudinal direction and, thereafter, simultaneously biaxially (longitudinally and laterally) stretched, the apparatus comprising stretching rollers for effecting partial longitudinal stretching of the film, the rollers being arranged upstream of an assembly for effecting simultaneous biaxial stretching of the film. The speed of the stretching rollers is infinitely variable so as to influence the total degree of film-stretching only by changing the speed of the rollers. The rollers used for longitudinal pre-stretching are arranged at the inlet section of the biaxial stretching assembly. A system is provided to maintain the fiml exactly at the temperature required by the film characteristics for stretching, and biaxial stretching is done such tht any given point on the film in the region the film is being biaxially streched undergoes simultaneous biaxial stretching both in the longitudinal and transverse direction of the film.
REFERENCES:
patent: 3046599 (1962-07-01), Nicholas et al.
patent: 3172150 (1965-03-01), Donier
patent: 3890421 (1975-06-01), Habozit
"Biaxial Stretching of Polypropylene Film, Jock, British Plastics, Jul. 1961, pp. 391-394.
Armsen Rotger
Graap, deceased Volker
Hufnagel Walter
von und zu Aufsess Freidrich
Internationale Octrooi Maatschappij "Octropa" B.V.
Lowe James
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