Die for tubular film extrusion
AssigneeTecno Coating Engineering S.R.L.
InventorClaudio Gini
Life of this patent
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Abstract
The die includes a central core and an annular ring arranged around the core, so as to define an annular slit for extruding a material, as well as a multiple number of inserts peripherally arranged around the ring and mechanically tied to the same, and device for heating the inserts independently from each other, so as to be able to change by thermal deformation of the inserts, the thickness of the annular slit. The inserts are radially arranged around the ring and attached to the structure of the machine on the inner side, next to the ring, while their free opposite extremities are free to radially slide so as to expand toward the out. Devices mechanically tie the inserts to the ring and devices heat and/or cool the inserts.
Claims6
A die for extrusion of a tubular film, the die comprising:
- a central core;
- an annular ring arranged around said core so as to define a body having an annular slit for extruding a material;
- a plurality of inserts peripherally arranged around said ring and mechanically attached to the body of said ring;
- devices for heating said inserts independently from each other, so as to be able to change, by thermal deformation of said inserts, the thickness of the annular slit;
- sides of said inserts facing said core are radially arranged around said ring and attached to the body of said ring, while sides of said insets opposite said core are free to radially slide so as to expand in a direction away from said core;
- and
- means for mechanically attaching said inserts to said ring.
Dependencies are inferred from the claim text.