Composite Closure Bead and PVC-Free Gasket for Seal Stability
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Solution Overview
Problem
Existing composite closures face challenges in replacing gasket materials due to considerations such as toxicity, sealing properties, and compatibility with existing manufacturing equipment, which complicates the selection of alternative gasket materials for use in cold-filled, hot-filled, or thermally processed products.
Innovation Solution
A composite closure design featuring a plastic shell with inwardly extending circumferential beads that provide a controlled radial force for proper sealing and anti-backoff features, using non-deformable flat surfaces in contact with a metal or plastic end panel, and employing PVC-free gasket materials like rubbery block copolymers and thermoplastic elastomers for improved sealing and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional gasket materials are used in composite closures, then sealing properties are maintained, but toxicity concerns arise and material replacement becomes difficult
Solution Approach 1:
The patent changes the material parameters by transitioning from traditional PVC-based gasket materials to PVC-free alternatives such as rubbery block copolymers and thermoplastic elastomers. This material substitution maintains sealing functionality while eliminating toxic concerns, directly resolving the contradiction between reliability and harmful factors
Solution Approach 2:
The invention employs composite material structures where the gasket is formed from multi-component formulations (e.g., block copolymers combined with thermoplastic elastomers). These composite materials provide both the necessary sealing properties and the safety requirements, achieving both improved reliability and reduced toxicity simultaneously
2Object-affected harmful factors
If gasket material is replaced to eliminate toxic chemicals, then safety is improved, but manufacturing complexity increases due to equipment compatibility and material constraints
Solution Approach 1:
The patent develops gasket materials with universal compatibility across existing manufacturing equipment. The rubbery block copolymer and thermoplastic elastomer formulations are designed to work with standard injection molding and extrusion equipment already present in facilities, eliminating the need for specialized equipment while achieving toxic-free manufacturing
Solution Approach 2:
The invention employs cost-effective gasket materials that can be produced through existing manufacturing processes without requiring expensive equipment modifications. The use of readily available rubbery block copolymers and thermoplastic elastomers reduces both material and equipment investment costs, simplifying the transition to safe materials
3Object-affected harmful factors
If new gasket materials are used, then toxicity is reduced, but thermal processing compatibility becomes limited
Solution Approach 1:
The patent modifies the thermal parameters of the gasket materials by selecting rubbery block copolymers and thermoplastic elastomers with elevated service temperature ranges. These materials maintain their sealing properties and structural integrity at pasteurization and sterilization temperatures, enabling thermal processing without compromising safety or functionality
4Adaptability or versatility
If gasket material shape is modified to accommodate new materials, then material compatibility is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality modifications to the gasket design by incorporating specific geometric features at critical sealing locations. The gasket cross-section includes a sealing bead with enhanced contact surface area at the interface with the container finish, providing localized sealing enhancement that compensates for variations in material properties and manufacturing tolerances
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures a perceptible resistance upon closure rotation, ensuring proper sealing and preventing movement after processing, while allowing for the use of PVC-free materials that maintain long-term sealing properties and compatibility with existing equipment.
Implementation Method 1
The plastic shell includes an inwardly extending circumferential bead or bead segments that include a non-deformable flat vertical surface that is substantially parallel to the axis of the closure and axially positioned for contact with a radial outermost surface of the end panel... provides a perceptible resistance upon rotation of the closure from its fully applied state which produces a disengagement torque
Data Source
AI summary
A composite closure which includes an improved sealing gasket material and shape. The Closure includes an end panel that is received in a circular plastic fitment having a central opening therein defined by an inwardly extending flange which over-lies in an outer periphery of the end panel and an integral skirt downwardly depending from the flange. The fitment includes an inwardly extending circumferential bead or bead segments which include a substantially non-deformable flat vertical surfaces that are substantially parallel to the axis of the closure and axially positioned to contact the radial outer-most edge of the end panel when the closure is fully applied to a container. The sealing gasket has the shape of an annulus with a particular cross-section and formed from a PVC free material.