System and method for reducing draw resonance in plants for the production of plastic film
AssigneeColines S.P.A.
InventorNicola Lombardini
Life of this patent
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Abstract
A system and method for reducing draw resonance of a plastic material in molten state, so-called melt, leaving an extrusion group of a plant for the production of plastic film, includes at least one thermostatically-controlled cylinder, having an embracement angle of the melt on the cylinder that is adjustable on the basis of the process rate, i.e., the linear movement speed of the plastic film, and/or on the basis of the temperature measured in the proximity of or in correspondence with the clamping area of the melt in a thermoforming, calibration and cooling group included in the plant and positioned downstream of the system.
Claims6
A method of reducing draw resonance of a melt of a plastic material, leaving an extrusion group of a plant for production of a plastic film, comprising:
- regulating a temperature of the melt, after extruding the melt and before clamping by a thermoforming, calibration and cooling group of the plant, by causing passage of the melt over a thermostatically-controlled cylinder, the thermostatically-controlled cylinder having an embracement angle of the melt thereon that is adjustable based on one or more of:
- process rate, the process rate comprising a linear movement speed of the plastic film, or
- temperature of the melt measured in proximity of or in correspondence with a clamping area of the melt.
Dependencies are inferred from the claim text.