Abstract: A preform-molding device has a nozzle section including three cylindrical layer-forming flow channels, which include an inner flow channel and an outer flow channel for forming the substrate layers of the main resin, and a middle flow channel for forming the intermediate layer, and also includes a predetermined number of vertical blocking rib pieces disposed at a downstream end of the middle flow channel, in parallel in the circumferential direction, so that the intermediate layer would be segmented in the circumferential direction into a predetermined number of vertically running streams, wherein flow behavior of the intermediate-layer resin flowing through the middle flow channel is adjusted by positioning the vertical blocking rib pieces in the circumferential direction so as to minimize a difference in height between a maximum height point and a minimum height point that appear in a leading edge of the intermediate layer of the preform.

Abstract: A biaxially stretched, blow molded container obtained by molding a laminated test tube shaped preform molded by an injection molding process. The container has a neck, a body, and a bottom, and having an outer shell and an inner bag to be laminated in a peelable manner with an outer layer inner surface. The inner bag can be deflated under a pressure drop therein. The outer layer and an inner layer have a laminar structure in which the lamination extends from a predetermined position of the neck to a lower end face. The layers are peeled from each other, starting from a lamination interface between the layers. This interface is exposed outside at the lower end face of the gate mark and can be used as an air intake vent that enables outside air to be taken into the space between layers.

Abstract: A biaxially stretched, blow molded container is obtained by molding a laminated test tube shaped preform molded by an injection molding process. The container has a neck, a body, and a bottom, and having an outer shell and an inner bag to be laminated in a peelable manner with an outer layer inner surface. The inner bag can be deflated under a pressure drop therein. The outer layer and an inner layer have a laminar structure in which the lamination extends from a predetermined position of the neck to a lower end face. The layers are peeled from each other, starting from a lamination interface between the layers. This interface is exposed outside at the lower end face of the gate mark and can be used as an air intake vent that enables outside air to be taken into the space between the layers.

Abstract: A synthetic resin container or bottle with a window obtained by subjecting a test tube-shaped preform made by injection molding to biaxial stretch blow molding is provided. The container includes a transparent base layer; a circumferential wall formed of the transparent base layer; and a light-blocking or opaque intermediate layer formed in the base layer in a laminated manner to cover an area of a predetermined height of the circumferential wall. The intermediate layer is formed in a laminated manner over an area covering an entire circumference of the circumferential wall excluding a non-laminated section, where the intermediate layer is not formed, that extends in a shape of a longitudinal strip along the central axis direction of the container on the circumferential wall of the container. The non-laminated section serves as a window section.

Abstract: An injection molding device including a middle flow channel which forms an intermediate layer of a preform which is subject to biaxial stretch blow molding. The middle flow channel s segmented into a predetermined number of flow sub-channels by vertical blocking rib piece(s). Side wall's upstream portions of the vertical blocking rib piece are formed as angled surfaces whose distance from each other decreases from the downstream side to the upstream side, and/or, an end portion of the vertical blocking rib piece that is located on the downstream side is tucked in at least one of the inner flow channel and the outer flow channel.

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.

Abstract: A biaxially stretched, blow molded container is obtained by molding a laminated test tube shaped preform molded by an injection molding process. The container has a neck, a body, and a bottom, and having an outer shell and an inner bag to be laminated in a peelable manner with an outer layer inner surface. The inner bag can be deflated under a pressure drop therein. The outer layer and an inner layer have a laminar structure in which the lamination extends from a predetermined position of the neck to a lower end face. The layers are peeled from each other, starting from a lamination interface between the layers. This interface is exposed outside at the lower end face of the gate mark and can be used as an air intake vent that enables outside air to be taken into the space between the layers.

Abstract: A process includes: supplying a main resin from outer and inner flow channel, to a joined flow channel at a predetermined supply velocity for a predetermined time; supplying a second resin from a middle flow channel to the joined flow channel simultaneously with the main resin at a predetermined supply velocity for a certain time within the predetermined time; and sliding a shut-off pin to bring the pin forefront to a predetermined position near an outlet of the inner flow channel, open to the joined flow channel, before the second resin is supplied, or during a time starting after a time from the start of the second resin supply and ending with the termination of the supply, so that the velocity of main resin supply from the inner flow channel to the joined flow channel is reduced to a predetermined level by adjusting the degree of aperture for the outlet.

Abstract: A preform-molding device has a nozzle section including three cylindrical layer-forming flow channels, which include an inner flow channel and an outer flow channel for forming the substrate layers of the main resin, and a middle flow channel for forming the intermediate layer, and also includes a predetermined number of vertical blocking rib pieces disposed at a downstream end of the middle flow channel, in parallel in the circumferential direction, so that the intermediate layer would be segmented in the circumferential direction into a predetermined number of vertically running streams, wherein flow behavior of the intermediate-layer resin flowing through the middle flow channel is adjusted by positioning the vertical blocking rib pieces in the circumferential direction so as to minimize a difference in height between a maximum height point and a minimum height point that appear in a leading edge of the intermediate layer of the 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.

Abstract: Disclosed is an injection molding device and process for a test tube shaped preform, that can laminate a colored layer at certain positions with a certain thickness accurately. Included is a nozzle section, in which a molten main resin and second resin are joined together to form a joined resin mass, the nozzle section including: an outer flow channel through which the main resin flows, an inner flow channel through which the second resin flows, a cylindrical column-shaped flow channel where the second resin joins the main resin, a first confluence where the main resin flows into the joined flow channel, a second confluence where the second resin flows into the joined flow channel wherein the first confluence is downstream of the second confluence, and a cylindrical shutoff pin inserted in the joined flow channel to open or close one or both the first and second confluences.

Abstract: A laminated bottle with a gas barrier resin layer arranged between polyester resins layers is provided. The gas barrier resin layer includes a plurality of quadrangular segments with two sides extending along the bottle axis and two sides extending around the bottle axis, wherein the segments are arranged at a distance to each other via connecting layers which connect the inner layer and the outer layer.

Abstract: 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.

Abstract: 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.

Abstract: A laminated bottle with a gas barrier resin layer arranged between polyester resins layers is provided. The gas barrier resin layer includes a plurality of quadrangular segments with two sides extending along the bottle axis and two sides extending around the bottle axis, wherein the segments are arranged at a distance to each other via connecting layers which connect the inner layer and the outer layer.

Abstract: It is intended to provide a synthetic resin bottle, in which the stable no-leak condition can be maintained up to a certain cap-turning angle, and air-tightness of the bottle can be fully secured, even if the cap is falsely turned. The body 2 of the synthetic resin bottle is configured to have a smooth seal surface 8 with no irregularity over the entire circumference in the upper portion of the outer neck wall where no parting line is formed. In this configuration, a stable no-leak condition can be maintained up to a certain cap-turning angle, and air-tightness of the bottle can be fully secured, even if the cap is falsely turned.

Abstract: It is intended to provide a synthetic resin bottle, in which the stable no-leak condition can be maintained up to a certain cap-turning angle, and air-tightness of the bottle can be fully secured, even if the cap is falsely turned. The body 2 of the synthetic resin bottle is configured to have a smooth seal surface 8 with no irregularity over the entire circumference in the upper portion of the outer neck wall where no parting line is formed. In this configuration, a stable no-leak condition can be maintained up to a certain cap-turning angle, and air-tightness of the bottle can be fully secured, even if the cap is falsely turned.

Abstract: There is provided a cylindrical extrusion-blow molded container, or a cylindrical delaminatable blow-molded container in particular, having an inner layer made of a poorly fusion-bonded resin material such as nylon, in order to improve the fusion-bond of the bottom seal section of the container, to prevent the bottom from cracking.In a cylindrical extrusion-blow mold container, or a cylindrical delaminatable blow-molded container having an air inlet hole arranged at a neck of the container, a bottom seal section in a bottom wall of a bottom is formed with an elliptic thick and raised section arranged in and near the bottom seal section, said elliptic thick and raised section approximately showing an ellipsoid having an elliptic contour with its major axis running along a parting line.