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US 11,298,861 B2Granted
Multi-layer injection molded container
AssigneeSilgan Specialty Packaging LLC
InventorsJoel R. Frerichs, Brian W. Elflein, Joshua J. Eastman
Life of this patent
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Abstract
A coinjection molded multi-layer container includes an inner layer, an outer layer, and a barrier layer. The inner layer includes a first polymeric material and forms an inside surface of the container. The outer layer includes the first polymeric material and forms an outside surface of the container. The barrier layer is located between the inner layer and the outer layer and includes a second polymeric material less permeable to gas than the first polymeric material. The barrier layer is biased toward the inside surface or the outside surface such that the inner layer and the outer layer have different thicknesses.
Claims20
A coinjection molded multi-layer container comprising:
- an inner layer comprising a first polymeric material and forming an inside surface of the container;
- an outer layer comprising the first polymeric material and forming an outside surface of the container;
- and
- a barrier layer located between the inner layer and the outer layer and comprising a second polymeric material less permeable to gas than the first polymeric material, wherein the barrier layer is biased toward the inside surface or the outside surface such that the inner layer and the outer layer have different thicknesses;
- wherein the inner layer, the barrier layer, and the outer layer form a multi-layer wall structure defining a closed base of the container and a side wall of the container, the side wall of the container having a lower rim coupling the side wall of the container to a perimeter of the base of the container and an upper shoulder offset from the lower rim, a cross-section of the side wall of the container having a linear portion extending from the lower rim to the upper shoulder;
- an energy director ring protruding from the inside surface at a location along the linear portion of the side wall between the upper shoulder and the lower rim of the container and extending circumferentially along the inside surface, the energy director ring configured to concentrate a welding force applied to the inside surface;
- a filter comprising a base of the filter and a side wall of the filter, the side wall of the filter welded to the inside surface at the location of the energy director ring such that a gap exists between the base of the filter and the base of the container, the gap allowing the base of the container to be punctured when the container is in use without puncturing the filter;
- and
- a circumferential weld formed along the inside surface at the location of the energy director ring as a result of welding the filter to the inside surface, the weld securing the filter to the inside surface.
6 more elements
A coinjection molded multi-layer container comprising:
- a base forming a bottom surface of the container;
- a side wall forming a side surface of the container and having a lower rim coupling the side wall to a perimeter of the base;
- an upper shoulder coupled to an upper rim of the side wall and extending radially outward from the side wall and away from the base, a cross-section of the side wall having a linear portion extending from the base to the upper shoulder;
- a flange coupled to the upper shoulder and extending radially outward from the upper shoulder to form a top surface of the container;
- an energy director ring protruding from an inside surface of the side wall at a location along the linear portion between the base and the upper shoulder;
- a filter comprising a base of the filter and a side wall of the filter, the side wall of the filter welded to the inside surface at a location of the energy director ring such that a gap exists between the base of the filter and the base of the container, the gap allowing the base of the container to be punctured when the container is in use without puncturing the filter;
- and
- a weld formed along the inside surface at the location of the energy director ring as a result of the energy director ring concentrating a welding force applied to the inside surface when welding the filter to the inside surface, the weld securing the filter to the inside surface;
- wherein the base of the container, the side wall of the container, the upper shoulder, and at least part of the flange have a multi-layer wall structure comprising:
- an inner layer comprising a first polymeric material and forming the inside surface of the side wall;
- an outer layer comprising the first polymeric material and forming an outside surface of the side wall;
- and
- a barrier layer located between the inner layer and the outer layer and comprising a second polymeric material less permeable to gas than the first polymeric material, the barrier layer biased toward the inside surface or the outside surface such that the inner layer and the outer layer have different thicknesses.
10 more elements
A coinjection molded multi-layer container comprising:
- an inner layer comprising a first polymeric material and forming an inside surface of the container;
- an outer layer comprising the first polymeric material and forming an outside surface of the container;
- and
- a barrier layer located between the inner layer and the outer layer and comprising a second polymeric material less permeable to gas than the first polymeric material, wherein the barrier layer is:
- biased toward the inside surface of the container within a first portion of the container such that the outer layer is thicker than the inner layer within the first portion of the container;
- and
- biased toward the outside surface of the container within a second portion of the container such that the inner layer is thicker than the outer layer within the second portion of the container;
- one or more symbols or lettering etched into the outer layer within the first portion of the container, wherein the outer layer being thicker than the inner layer within the first portion of the container ensures that the lettering or symbols do not penetrate into the barrier layer when etched into the outer layer within the first portion;
- an energy director ring protruding from the inner layer of the second portion of the container and configured to concentrate a welding force at the second portion of the container, a cross-section of the container having a linear portion extending from a lower rim of the container to an upper shoulder of the container, the energy director ring located along the linear portion between the lower rim and the upper shoulder;
- a filter comprising a base of the filter and a side wall of the filter, the side wall of the filter welded to the second portion of the container at a location of the energy director ring such that a gap exists between the base of the filter and a base of the container, the gap allowing the base of the container to be punctured when the container is in use without puncturing the filter;
- and
- a weld formed within the second portion of the container at which the inner layer is thicker than the outer layer as a result of the energy director ring concentrating the welding force at the second portion of the container, the weld securing the filter to the second portion of the container without penetrating into the barrier layer.
9 more elements
Dependencies are inferred from the claim text.