US 11,731,328 B2
Apparatus for the injection moulding of articles formed by plastic materials having different characteristics
Maurizio Bazzo, San Polo di Piave (IT)
Assigned to INGLASS S.p.A. con Socio Unico, San Polo di Piave (IT)
Filed by INGLASS S.p.A. con Socio Unico, San Polo di Piave (IT)
Filed on Oct. 8, 2021, as Appl. No. 17/496,913.
Application 17/496,913 is a division of application No. 16/193,487, filed on Nov. 16, 2018, granted, now 11,167,461.
Claims priority of application No. 102017000135341 (IT), filed on Nov. 24, 2017.
Prior Publication US 2022/0024089 A1, Jan. 27, 2022
Int. Cl. B29C 45/22 (2006.01); B29C 45/16 (2006.01); B29C 45/00 (2006.01); B29C 45/76 (2006.01); B29L 31/30 (2006.01); B29C 45/27 (2006.01)
CPC B29C 45/164 (2013.01) [B29C 45/0025 (2013.01); B29C 45/22 (2013.01); B29C 45/76 (2013.01); B29C 2045/0032 (2013.01); B29C 2045/1651 (2013.01); B29C 2045/1698 (2013.01); B29C 2045/279 (2013.01); B29C 2945/76056 (2013.01); B29C 2945/76277 (2013.01); B29C 2945/76381 (2013.01); B29C 2945/76384 (2013.01); B29C 2945/76568 (2013.01); B29C 2945/76645 (2013.01); B29C 2945/76765 (2013.01); B29K 2995/0021 (2013.01); B29L 2031/3044 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An apparatus for the injection moulding of articles formed by plastic materials having different characteristics, the apparatus comprising:
a mould having at least one cavity having at least one first and one second zone placed in communication with each other and to which there are associated respective first and second injectors with controlled opening and closing, respectively supplied with at least one first plastic material and at least one second plastic material having said different characteristics,
an electronic control unit configured to control a position, displacement and/or speed of a valve pin of the first and second injectors during a single injection cycle to:
inject the at least one first and the second plastic materials respectively into said first and into said second zone of the at least one mould cavity by said first and second injectors so as to originate respective flow fronts whose collision generates at least one weld line, and
control said first and second injectors according to specific modes so as to define a shape and/or a position of said at least one weld line,
wherein the opening of at least one injector of the first and second injectors is either anticipated or delayed with respect to the other injectors of the first and second injectors so as to define the position of said at least one weld line,
wherein at least one of said first and second injectors is closed partially so as to define the shape of said at least one weld line, and
wherein at least another one of said first and second injectors is opened gradually and only partially so as to define the shape of said at least one weld line.