US 9,808,983 B2
Polymeric material for container
David Dezhou Sun, Evansville, IN (US)
Assigned to Berry Plastics Corporation, Evansville, IN (US)
Filed by Berry Plastics Corporation, Evansville, IN (US)
Filed on Sep. 2, 2014, as Appl. No. 14/475,096.
Claims priority of provisional application 61/872,260, filed on Aug. 30, 2013.
Claims priority of provisional application 61/872,368, filed on Aug. 30, 2013.
Claims priority of provisional application 61/872,183, filed on Aug. 30, 2013.
Prior Publication US 2015/0061192 A1, Mar. 5, 2015
Int. Cl. B29C 49/22 (2006.01); B29C 49/04 (2006.01); B29C 49/00 (2006.01); B29C 47/56 (2006.01); B29C 47/00 (2006.01); B29C 47/06 (2006.01); B29B 11/10 (2006.01); B29K 23/00 (2006.01); B29L 31/00 (2006.01); B29C 49/42 (2006.01); B29C 49/46 (2006.01); B29K 105/04 (2006.01); B29C 49/48 (2006.01); B29C 49/62 (2006.01)
CPC B29C 49/22 (2013.01) [B29B 11/10 (2013.01); B29C 47/0023 (2013.01); B29C 47/0054 (2013.01); B29C 47/065 (2013.01); B29C 47/56 (2013.01); B29C 49/0005 (2013.01); B29C 49/04 (2013.01); B29B 2911/14166 (2013.01); B29C 49/4252 (2013.01); B29C 49/46 (2013.01); B29C 49/4817 (2013.01); B29C 2049/4608 (2013.01); B29C 2049/627 (2013.01); B29C 2791/006 (2013.01); B29C 2791/007 (2013.01); B29K 2023/065 (2013.01); B29K 2105/04 (2013.01); B29K 2995/0063 (2013.01); B29L 2031/712 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method of producing a multilayer vessel, the method comprising the steps of
extruding an inner-layer formulation, a core-layer formulation, and an outer-layer formulation to form an inner parison, an outer parison, and a core parison configured to have a core-parison density different than each of an inner-parison density of the inner parison and an outer-parison density of the outer parison,
aligning the inner parison, the core parison, and the outer parison to cause the core parison to be located between the inner parison and the outer parison to cause the core parison to surround the inner parison and to be surrounded by the outer parison to form a multilayer tube,
placing the multilayer tube in a mold cavity formed in a mold, and
expanding the multilayer tube to cause the multilayer tube to deform so that the outer parison engages an inner surface of the mold and a multilayer vessel having an interior region formed therein is provided and to transform the core parison into a core layer having a core-layer density,
wherein a ratio of the core-layer density of the multilayer vessel to the core-parison density of the multilayer tube is in a range of about 1 to about 2.