Device for automatic control of blown film thickness

Details Device for automatic control of blown film thickness Device for automatic control of blown film thickness

B - Operations, Transporting

29

C

B29C 49/78 (2006.01) B29C 49/04 (2006.01) B29C 49/64 (2006.01)

Patent

CA 2593107

In an improved system for controlling the thickness of a blown film, a controlled air flow is provided to the blown film as it exits from an extrusion die still in liquid form. The system has a cooling ring with an annular region through which the air is blown onto the blown film, after passage through one of a plurality of radial channels. The improvement is achieved by a plurality of adjustable barriers, one of which is inserted in each of the radial channels. A first and a second servomotor allow indexable selection and adjustment of any particular barrier. Each barrier has a head and a shank, the head adapted to engage a clamp associated with one of the servomotors. Rotating the barrier in one direction increases cross-sectional air flow area in the radial channel and rotating it in the opposite direction decreases the cross- sectional air flow area.

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