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Pvc film stretching production
Jun 28, 2018

Stretch production of pvc film is performed on a calender line or on a dedicated stretcher. The stretching methods are uniaxial stretching and biaxial stretching. Uniaxial stretching refers to the longitudinal or transverse stretching of a film blank. Biaxial stretching refers to the stretching of both longitudinal and transverse directions of the film.

Uniaxially stretched pvc films are currently used in calender production lines. The method is to introduce the polyvinyl chloride film formed on the roller of the calender into a tenter after being peeled from the surface of the roller (at this time the temperature of the film blank is above the glass transition temperature and below the melting temperature), and both ends of the film blank are stable. The running conveyor belt is clamped up and down, and the film blank clamped by the conveyor belt is widened laterally as the horizontal running distance of the conveyor belt at both ends of the film blank is gradually increased. It is economical and convenient to produce a film blank from a roller with a smaller face size and then stretch it so that a wide film can be produced.

Films that can be uniaxially stretched include polypropylene films, high-density polyethylene films, and polyvinyl chloride films. Biaxial stretch film is generally performed on a dedicated stretcher. The stretched film blank is firstly introduced into a multi-roller longitudinal stretching drum, the inside of the drum is heated by steam, and the pvc transparent film is hauled forward by the drum.

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