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
Estimating the term…
Abstract
A system and method for reducing draw resonance of plastic material in the 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, 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.
Claims11
A system for reducing draw resonance of a melt of plastic material in molten state, leaving an extrusion group of a plant for production of plastic films, comprising:
- at least one thermostatically-controlled cylinder, having an embracement angle of the melt on the thermostatically-controlled cylinder, adjustable based on one or more of:
- process rate, the process rate comprising a linear movement speed of a plastic film, or
- temperature measured in proximity of or in correspondence with a clamping area of said melt in a thermoforming, calibration and cooling group included in said plant and positioned downstream of said system.
A plant for production of a film made of a plastic material comprising:
- at least one extrusion group;
- at least one thermoforming, calibration and cooling group;
- and
- downstream of said at least one extrusion group, at least one system reducing draw resonance of a melt of the plastic material in molten state, leaving the extrusion group comprising:
- at least one thermostatically-controlled cylinder, having an embracement angle of the melt on the thermostatically-controlled cylinder, adjustable based on one or more of:
- process rate, the process rate comprising a linear movement speed of the film, or
- temperature measured in proximity of or in correspondence with a clamping area of said melt in a thermoforming, calibration and cooling group included in said plant and positioned downstream of said system.
A method of reducing draw resonance of a melt of a plastic material in molten state, leaving an extrusion group of a plant for production of a plastic film, comprising:
- between an extrusion step of the melt and a clamping step performed by at least one thermoforming, calibration and cooling group of the plant, causing a temperature regulation step of the melt performed through passage of said melt over at least one thermostatically-controlled cylinder, having an embracement angle, of the melt on said cylinder, adjustable based on:
- process rate, the process rate comprising one or more of a linear movement speed of the plastic film, or
- temperature measured in proximity of or in correspondence with the clamping area of said melt.
Dependencies are inferred from the claim text.