Stretching machine

D - Textiles – Paper – 06 – C

Patent

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Details

D06C 3/00 (2006.01) B29C 55/16 (2006.01)

Patent

CA 2049575

A pair of stretching pulleys are rotatably mounted on a pair of support plates within-a housing. A belt is wound around the upper part of the stretching pulley and a number of turn pulleys. A film introduced onto the stretching pulley is held between the belt and the stretching pulley and is transferred. Air flow generated by a fan and heated with a heater is blown against the film through a louver and circulates through bellows mounted to the housing to return to the fan. The stretching pulley is partially cooled in a water bath. The support plates are rotatably connected to screw shafts, thereby changing a distance and angle between the plates. The stretch width or stretch ratio of the film is thus adjusted with the change of the distance and angle.

Une paire de poulies de tension pouvant tourner sont fixées à une paire de plaques-supports à l'intérieur d'un boîtier. Une courroie est enroulée autour de la partie supérieure de la poulie de tension et d'un certain nombre de poulies de rappel. Une pellicule placée dans la poulie de traction est maintenue entre la courroie et la poulie de traction et est transférée. Un écoulement d'air généré par un ventilateur et chauffé à l'aide d'un dispositif de chauffage est propulsé contre la pellicule au travers d'une persienne et circule par l'entremise de soufflets montés sur le boîtier afin de retourner vers le ventilateur. La poulie de traction est partiellement refroidie dans un bain d'eau. Les plaques-supports sont reliées en rotation à un arbre d'hélice, de façon à pouvoir changer la distance et l'angle entre les plaques. La largeur d'étirement ou le rapport d'étirement de la pellicule est ensuite ajusté en fonction de la modification de la distance et de l'angle.

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