US 2014/0091492 A1 · LAMINATED SYNTHETIC RESIN BOTTLE, INJECTION MOLDING DEVICE, AND PROCESS FOR MOLDING A LAMINATED PREFORM

Abstract

A problem to be solved by this invention is to control the above-described problem of delamination in the laminated and biaxially drawn, blow molded bottle. A major means of this invention to solve this problem is a biaxially drawn, blow molded bottle characterized in that vertical connecting zones having no intermediate layer and having substrate layers welded directly with each other are formed in parallel in a circumferential direction and in a plural number along an axial direction of the bottle and are disposed on both right and left sides of each intermediate layer segment to be formed in this height range, and that horizontal connecting zones having no intermediate layer and having substrate layers welded directly with each other are also formed in parallel in an axial direction and in a plural number along a circumferential direction of the bottle and are disposed on both upper and lower sides of each intermediate layer segment to be formed, thus allowing the intermediate layer to be segmentalized in the circumferential and axial directions by both the vertical and horizontal connecting zones.

Claims20

Dependent claims

An injection molding device to be used to injection mold a laminated preform, which is in a test-tube shape, has substrate layers of a main resin and at least an intermediate layer, and is used in biaxial drawing and blow molding, said injection molding device comprising two resin feeders to feed the main resin and at least a resin for forming an intermediate layer, a multi-nozzle section in which to laminate the main resin with the intermediate-layer resin, and a mold for molding the preform,

wherein the multi-nozzle section comprises at least three layer-forming flow channels:
a cylindrical inner flow channel and a cylindrical outer flow channel to form the substrate layers of the main resin and
a cylindrical middle flow channel located between the inner flow channel and the outer flow channel to form the intermediate layer, and
a joined flow channel disposed downstream of at least three layer-forming flow channels and by way of a confluence where molten resins join after having flowed through respective layer-forming flow channels, and
wherein at some points ranging from a given position along the middle flow channel to the confluence, a plural number of vertical blocking rib pieces are disposed in parallel in the circumferential direction so as to cross the middle flow channel and to divide the flow through the middle channel into multiple streams along the circumferential direction.

2 more elements

A process for molding a laminated preform by utilizing the injection molding device, said preform being in a test-tube shape and used in the biaxial drawing and blow molding, having substrate layers and an intermediate layer laminated between the substrate layers in a given height range, and having such a laminate structure that narrow vertical connecting zones having no intermediate layer and having substrate layers welded directly with each other are formed in parallel in a circumferential direction and in a plural number along an axial direction of the preform and are disposed on both right and left sides of each intermediate layer segment to be formed in this height range, thus allowing the intermediate layer to be segmentalized in the circumferential direction by these vertical connecting zones,

wherein the process comprises the steps of:
(i) utilizing an injection molding device having a multi-nozzle section which laminates the substrate layers made of a main resin with an intermediate layer made of an intermediate-layer resin,
(ii) supplying a cylindrical flow channel inside the multi-nozzle section with the main resin for a predetermined time span to form substrate layers, while at the same time, supplying a cylindrical flow channel with an intermediate-layer resin coming from another feeder for a certain limited time during this predetermined time span to form the intermediate layer,
(iii) dividing the intermediate-layer resin inside the middle flow channel into multiple streams in a circumferential direction,
(iv) joining the circumferentially segmentalized intermediate-layer resin in a manner that the intermediate-layer resin is sandwiched between the substrate layers of the main resin at the confluence to form a laminated molten resin fluid, and
(v) filling a mold cavity with the laminated molten resin fluid.

3 more elements

Dependencies are inferred from the claim text.

Laminated synthetic resin bottle, injection molding device, and process for molding a laminated preform

Life of this patent

Laminated synthetic resin bottle, injection molding device, and process for molding a laminated preform

Life of this patent

Abstract

Claims20