Abstract:
A multilayer polyester container comprising inner and outer layers of a polyester resin and at least one intermediate layer of a polyamide resin, wherein in the container body portion, the intermediate layer of the polyamide resin has an exothermic peak starting temperature due to crystallization of not lower than 96° C. as measured by a differential scanning calorimetry, and a clay is dispersed in the polyamide resin, effectively preventing whitening of the intermediate layer even after the passage of time and featuring excellent transparency despite of using, as an intermediate layer, a polyamide resin composition obtained by blending the polyamide resin with the clay.
Abstract:
A pressure-resistant polyester container having a multilayer structure comprising inner and outer layers of a polyester resin and at least one intermediate layer of a functional resin, wherein in the container body portion, the inner layer of the polyester resin has a crystallinity of not less than 23%, the outer layer thereof has a crystallinity of not less than 18%, the average value of the crystallinity of the inner layer and the crystallinity of the outer layer is not less than 24%. The pressure-resistant polyester container effectively prevents whitening even after the passage of time and features excellent transparency despite of using, as an intermediate layer, a functional resin composition obtained by blending a functional resin with a clay. The invention, further, provides a process for producing the same.
Abstract:
Molded preform for blow molding a plastic container for pressurized applications, the preform having a base with a multilayer wall for forming a delamination and crack resistant multilayer footed container base. The preform base forming region has an end cap portion with a non-spherical inner wall, including a flattened central section joined by arcuate corner sections to a generally cylindrical outer section. The inner wall sections provide a varying end cap thickness profile which enhances orientation in select portions of the footed container base for improved performance and/or lightweighting of the container base.
Abstract:
A method of making a preform assembly includes providing a preform having a closed end, and providing an attachment object having a ring. The attachment object is assembled to the preform by telescoping the ring over the closed end of the preform until the ring is brought into abutting engagement with a portion of the preform in such a way that interference between the ring and the portion of the preform prevents dislodgement or removal of the attachment object during subsequent processing of the preform assembly. The attachment object in the disclosed embodiments of the invention may be a handle, a label or a shroud. The ring on the attachment object may be circumferentially continuous or circumferentially split. Engagement between the attachment object ring and the preform may be by engagement with one or more external protrusions on the surface of the preform, or may be by interference press fit engagement between the ring and the external surface of the preform.
Abstract:
A finish assembly for a plastic container or preform includes a plastic neck having an open end surrounded by an external flange. The flange has an open axially facing channel adjacent to the outer surface of the neck. A plastic finish ring has an annular body, an inner surface opposed to the outer surface of the neck, an outer surface with at least one external thread, bead or other means for attachment of a closure, and an annular lip extending into the channel. The channel is formed in part by a radially inwardly extending conical surface on the flange, and the lip has a radially outwardly extending conical surface in facing engagement with the radially inwardly facing conical surface on the flange to seal the finish ring against the flange against entry of liquid between the finish ring and the neck.
Abstract:
A method of making a plastic container having a body and a finish with at least one external thread includes injection or compression molding a plastic preform having a body and a finish with at least one external thread, blow molding the body of the preform to form the body of the container, and either prior to, subsequent to or both prior and subsequent to blow molding the container body, expanding the injection or compression molded preform finish to form a container finish having at least one injection or compression molded external thread. In the preferred embodiments of the invention, the finish is expanded after the container body is blow-molded. The invention can be implemented to expand a narrow-neck preform or container finish to a wide-mouth preform or container finish.
Abstract:
A method of making a preform assembly includes providing an integrally molded preform having a neck with an external surface, an external flange at one end of the neck and a preform body at an opposing end of the neck. The flange and the body both have outside diameters that are greater than the outside diameter of the external surface of the neck. A split annular molded plastic finish ring is assembled to the preform by expanding the ring, moving the ring to a position encircling the neck, and then closing the ring around the neck. In one presently preferred embodiment of the invention, the split annular finish ring is of resilient construction. The ring is resiliently expanded and assembled to the preform by moving the ring over the body or the flange to a position encircling the neck, and then releasing the ring so that the ring resiliently contracts around the neck and engages the outer surface of the neck. In other embodiments of the invention, the split annular ring is provided with a hinge at which the ring may be expanded and contracted with respect to the preform neck, or the ring is provided in multiple pieces that are assembled around the neck of the preform.
Abstract:
This invention provides a plastic container characterized in that an expanded layer comprising expanded cells having a flat shape with an average major axis of not more than 400 μm and an average aspect ratio (L/t) of not less than 6 as viewed in cross section of the container wall along the maximum stretch direction, which are oriented in the stretch direction and are distributed so as to be superimposed on top of each other in the thickness-wise direction, is formed within the container wall. In this container, expanded cells having a flat shape are distributed so as to orient in a given direction and, thus, has light shielding properties and has a pearl-like appearance, that is, has a very high commercial value. Further, since any colorant is not contained, the suitability for recycling is excellent.
Abstract:
An extrusion feed device for a composite resin capable of forming a composite resin extruded material having a variety of layer configurations not necessarily symmetrical. A plurality of cylindrical flow passages (3) and (4) for feeding a molten resin, an opening/closing valve (7) capable of opening/closing a center flow passage (36) and a cylindrical flow passage (4a), and a center opening/closing valve (39) capable of opening/closing the center flow passage are provided at the upstream side end part (2a) of a discharge passage (2) for delivering the composite resin extruded material. A main resin (30a) forming an outside layer is always fed from the cylindrical flow passage (3), and the other molten resin (30b) and/or (30c) as an auxiliary resin is fed, at a proper timing, from the cylindrical flow passage (4) and the center flow passage (36) on the inside into the molten resin (30a) on the outside by controlling the opening/closing valve (7) or the center opening/closing valve (39). Thus, the composite resin mass in a variety of forms can be provided by involving, for example, multiple types of resins in the main resin layer in the state of being not involved in each other.
Abstract:
An extrusion feed device for a composite resin capable of forming a composite resin extruded material having a variety of layer configurations not necessarily symmetrical. A plurality of cylindrical flow passages (3) and (4) for feeding a molten resin, an opening/closing valve (7) capable of opening/closing a center flow passage (36) and a cylindrical flow passage (4a), and a center opening/closing valve (39) capable of opening/closing the center flow passage are provided at the upstream side end part (2a) of a discharge passage (2) for delivering the composite resin extruded material. A main resin (30a) forming an outside layer is always fed from the cylindrical flow passage (3), and the other molten resin (30b) and/or (30c) as an auxiliary resin is fed, at a proper timing, from the cylindrical flow passage (4) and the center flow passage (36) on the inside into the molten resin (30a) on the outside by controlling the opening/closing valve (7) or the center opening/closing valve (39). Thus, the composite resin mass in a variety of forms can be provided by involving, for example, multiple types of resins in the main resin layer in the state of being not involved in each other.