Guide roller for extrusion calibrators of tubular plastic films
OwnerOdino Pontaroloinventor
Life of this patent
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Abstract
A roller guide (9) for extrusion calibrators (1) of tubular plastic films (7), provided with a surface removable and interchangeable sleeve (10) made from materials having high thermal insulation characteristics and a good surface friction (grip) coefficient. Such characteristics allow a regular flow of the film being extruded (7) and a uniform cooling thermal dispersion throughout the surface development of said films.
Claims12
A roller guide for extrusion calibrators of tubular plastic films, said calibrators being constituted by tubular baskets (1) comprising a plurality of levers (2) located on spaced and superposed planes, interconnected with each other, and connected with motor-driven means to constitute the guide channel (6) of a tubular film (7) during the extrusion, characterized in that said roller (9) is provided with a removable and interchangeable surface sleeve (10), made from a material having high thermal insulation characteristics and a good surface friction (grip) coefficient, so as to ensure both the correct contact and rotary movement accompanying of the tubular plastic films to be extruded, and a uniform cooling thermal dispersion throughout the surface development of said plastic films being extruded.
The guide roller according to any of the preceding claims, characterized in that it is keyed on the front end (8) of each lever (2) and in that said levers (2) are so moved as to have their front ends (8) tangentially arranged according to circular forms to constitute the guide channel (6) of the film.
The guide roller according to any of the preceding claims, characterized in that sleeve (10) is tightly fitted on each roller (9) depending on its sliding guide action of the tubular film (7).
The guide roller according to any of the preceding claims, characterized in that its free front part is provided with a conic stress raiser.
The guide roller according to any of the preceding claims, characterized in that sleeve (10) is located in the central part of said roller (9).
The guide roller according to any of the preceding claims, characterized in that sleeve (10) partly covers the surface of said roller (9).
Dependencies are inferred from the claim text.