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July 1, 2002

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Multilayer blown Film Technology

NP_Kiefel_multi.jpgKirion multilayer blown film lines are arranged on a modular system that can be configured to produce up to seven layers. The three-layer system is arranged for production of standard films as well as technical films with a maximum layflat width of 2200 mm. The outer and inner layers are each fed by a 60-mm extruder, the middle layer by a 100-mm model. Hydraulic screenchangers are used exclusively so that product changes and maintenance are simplified.

Gravimetric feeding of the three-layer line allows feeding of three additional side components per extruder, even in minimum quantities. The gravimetric system can be extended, so dosing of a maximum of six components in addition to the main polymer is possible. The control system ensures recipe compliance and can be set up from the central operating screen.

The three-layer die with computerized spiral mandrels has a diameter of 500 mm. Even melt distribution and low residence time yields high output.

Kirion T hauloff enables different flattening lengths for various profile requirements. The coextrusion line has a module in which a minimum flattening angle of 8.5° (measured against the perpendicular) can be set. This results in advantages for difficult-to-produce technical films, which are susceptible to bagginess and other problems. Both the flattening angle and the central tubular film guide are directly controlled from the control console and hauloff. The collapsing frames are fitted with brushes, which absorb a minimum amount of heat and offer advantages for scratch-sensitive and sticky films. A turning bar system handles very sticky and optically sensitive films.

Kiefel Inc., Wrentham, MA
(508) 384-1200;

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