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AssigneeSml Maschinengesellschaft M. B. H.
InventorsTHOMAS RAUSCHER, Robert PREUNER, Doris EBERHARD
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A method and device for producing of a plastic foil especially a multi-layer stretch film, at which plastic material is extruded from a flat extrusion die and subsequently guided around a cooling roll following in the conveying direction and cooled. The foil is guided between the flat extrusion die and the cooling roll around a temperature controlling roll along a given angle of contact. The temperature controlling roll has a center region and two edge regions. The foil is kept at least in sections at a distance from the temperature controlling roll in the center region by creating an air cushion in the center region between the surface of the temperature controlling roll and the foil by supplying heated air between the surface of the temperature controlling roll and the foil in the center region. The foil is brought into contact with the temperature controlling roll in the edge regions.
A method for the production of a plastic foil, especially of a multi-layer stretch film, at which plastic material is extruded from a flat extrusion die and is subsequently guided around at least one cooling roll following in the conveying direction and is cooled thereby, wherein the foil is guided between the flat extrusion die and the cooling roll around a temperature controlling roll along a given angle of contact, wherein the temperature controlling roll has a center region and two edge regions adjoining to the same, wherein the foil is kept at least in sections at a distance from the temperature controlling roll in the center region by creating an air cushion in the center region of the temperature controlling roll between the surface of the temperature controlling roll and the foil by supplying heated air between the surface of the temperature controlling roll and the foil in the center region of the temperature controlling roll, wherein the foil is brought into contact with the temperature controlling roll in the edge regions.
A device for the production of a plastic foil, especially of a multi-layer stretch film, comprising a flat extrusion die by which plastic material can be output and at least one cooling roll following subsequently in the conveying direction for cooling the foil, wherein a temperature controlling roll is arranged between the flat extrusion die and the cooling roll and around which the foil can be guided along a given angle of contact, wherein the temperature controlling roll has a center region and two edge regions adjoining to the same, wherein the regions are formed by separate roll parts which follow in axial direction to another, wherein the temperature controlling roll consists in the center region at least in sections and at least partially from a porous material which is connected with at least one conduit for the supply of air into the porous material to create an air cushion between the foil and the center region and wherein means are arranged in the edge regions for creation of a contact between the foil and the temperature controlling roll.
Dependencies are inferred from the claim text.