US 12,214,539 B2
Device and a method for forming an object made of a polymeric material through the blowing of air into a tubular body
Fiorenzo Parrinello, Medicina (IT); and Fabrizio Pucci, Castel Guelfo di Bologna (IT)
Assigned to SACMI COOPERATIVA MECCANICI IMOLA SOCIETA' COOPERATIVA, Imola (IT)
Appl. No. 16/307,763
Filed by SACMI COOPERATIVA MECCANICI IMOLA SOCIETA′ COOPERATIVA, Imola (IT)
PCT Filed Jun. 20, 2017, PCT No. PCT/IB2017/053647
§ 371(c)(1), (2) Date Dec. 6, 2018,
PCT Pub. No. WO2018/025100, PCT Pub. Date Feb. 8, 2018.
Claims priority of application No. 102016000083036 (IT), filed on Aug. 5, 2016.
Prior Publication US 2019/0263045 A1, Aug. 29, 2019
Int. Cl. B29C 49/22 (2006.01); B29C 48/84 (2019.01); B29C 48/87 (2019.01); B29C 49/04 (2006.01)
CPC B29C 49/22 (2013.01) [B29C 48/845 (2019.02); B29C 48/87 (2019.02); B29C 49/04 (2013.01)] 9 Claims
OG exemplary drawing
 
1. 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).