US 12,365,127 B2
Method for regulating the cyclic production of containers by stretch-blowing
Arnaud Delaunay, Octeville-sur-Mer (FR)
Assigned to SIDEL PARTICIPATIONS, Octeville-sur-Mer (FR)
Appl. No. 17/604,402
Filed by SIDEL PARTICIPATIONS, Octeville-sur-Mer (FR)
PCT Filed Mar. 30, 2020, PCT No. PCT/EP2020/058925
§ 371(c)(1), (2) Date Oct. 16, 2021,
PCT Pub. No. WO2020/212124, PCT Pub. Date Oct. 22, 2020.
Claims priority of application No. 1904109 (FR), filed on Apr. 17, 2019.
Prior Publication US 2022/0212392 A1, Jul. 7, 2022
Int. Cl. B29C 49/78 (2006.01); B29C 49/08 (2006.01); B29C 49/28 (2006.01); G05B 13/02 (2006.01); B29K 67/00 (2006.01); B29L 31/00 (2006.01)
CPC B29C 49/783 (2013.01) [B29C 49/08 (2013.01); B29C 49/28 (2013.01); B29C 49/78 (2013.01); G05B 13/024 (2013.01); B29K 2067/003 (2013.01); B29L 2031/7158 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A process for regulating a cyclical production of containers (2) by stretch blow molding from preforms (3) made of plastic material in a machine (1) comprising one or more stretch blow molding stations (7), each designed to produce a container (2) during a production cycle, and each provided with a preblowing solenoid valve (17) fluidically connecting the preform (3) to a pressurized fluid source (15) providing a preblowing flow rate (Dp) during a preblowing phase, the regulating process comprising:
a) an initializing phase comprising installing by an operator and of storing of a plurality of operating parameters of the machine (1) during the production cycle, and of regulating parameters including at least one reference position (Ac, Bc, PCab, Fc) of at least one characteristic point (A, B, Pab, F) of a preblowing curve corresponding to a pressure prevailing inside the preform (3) during at least one part of the preblowing, said reference position (Ac, Bc, PCab, Fc) being determined by a reference instant and/or a reference pressure, b) a regulated production phase comprising, for each production cycle, stretching and blowing of at least one preform (3) by injection of a pressurized fluid in each station (7) and during which:
b1) for at least one reference station of the machine (1), the preblowing curve including the characteristic point is measured and stored, and a real instant and/or a real pressure is calculated or determined, corresponding to said characteristic point (A, B, Pab, F) for the measured preblowing curve, and
b2) a new value of at least one operating parameter of the machine (1) is calculated and stored as a function of a difference between the real instant and the reference instant and/or between the real pressure and the reference pressure, wherein, in this regulating process, the regulated production phase includes a step
b3) of monitoring a possible change, imposed by the operator, of a value of an operating parameter of the machine (1),
the regulating process further comprising a phase of automatically updating the regulating parameter(s), which is implemented in the event of an imposed change of an operating parameter of the machine (1), involving:
c1) continuing, during a stabilizing step, the production according the parameter imposed during a predetermined stabilizing period, and for each production cycle the actions b1) are executed, and the actions b2) are suspended, and
c2) correcting the reference instant and/or the reference pressure as a function of the real pressure and/or real instant values stored during the stabilizing step, in order to continue with the regulated production phase.