Device and a method for forming an object made of a polymeric material through the blowing of air into a tubular body
AssigneeSacmi Cooperativa Meccanici Imola Societa' Cooperativa
InventorsFiorenzo Parrinello, Fabrizio Pucci
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Abstract
A method for forming an object made of a polymeric material, wherein the polymeric material has a melting temperature (Tf), comprising the following steps: melting the polymeric material; cooling the polymeric material below the melting temperature (Tf); extruding the polymeric material into a tubular shaped body (H); inserting the tubular body (H) into a mould (60) having an internal cavity; closing off the tubular body (H) at a first end thereof; blowing air into the tubular body (H) through a second end, in order that the tubular body (H) adheres to the internal cavity of the mould (60).
Claims9
A method for forming an object made of a polymeric material, wherein the polymeric material has a melting temperature (Tf), and wherein the polymeric material has a crystallization start temperature (Tic) at which, under static conditions, crystals begin to form, the method comprising the following steps in the following order:
- a) melting the polymeric material;
- b) cooling the polymeric material to a temperature below the melting temperature (Tf) but above the crystallization start temperature (Tic);
- c) extruding the polymeric material into a tubular shaped body (H);
- d) inserting the tubular body (H), into a mould (60) having an internal cavity;
- e) closing off the tubular body (H) at a first end;
- f) blowing air into the tubular body (H) through a second end in order that the tubular body (H) adheres to the internal cavity of the mould (60);
- wherein the polymeric material is maintained at said temperature below the melting temperature (Tf) but above the crystallization start temperature (Tic) from (A) when it is cooled to said temperature below the melting temperature (Tf) but above the crystallization start temperature (Tic) in step b), to (B) through when the tubular body (H) is inserted into the mould (60) in step d).
Dependencies are inferred from the claim text.