Cork Stopper Thermal Expansion for Sealability
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Solution Overview
Problem
Cork stoppers produced by compression molding exhibit insufficient sealability and safety concerns due to permeation of liquids and inadequate gas barrier performance, with existing methods using thermally expandable microspheres contaminating the content with acrylonitrile and failing to provide sufficient sealability.
Innovation Solution
A method involving mixing cork grains with an adhesive, compression molding, and heating the intermediate to expand the cork grains, where the intermediate is preheated and placed in a mold to satisfy specific diameter ratios, using microwave or high-frequency heating for efficient expansion, thereby improving sealability and safety without using foaming agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If compression molding cork grains with adhesive is used to produce cork stoppers, then cost is reduced and environmental benefits are achieved, but sealability is insufficient and liquid permeation occurs
Solution Approach 1:
The invention changes the physical state and arrangement parameters of cork grains by heating the compression-molded intermediate to expand the grains, transforming them from a dense compressed state to an expanded state with improved sealability while maintaining the cost-effective compression molding process
Solution Approach 2:
The invention performs preliminary compression molding of cork grains and adhesive into an intermediate form, then subsequently heats this intermediate to expand the cork grains, achieving both cost-effectiveness and improved sealability through sequential processing steps
2Reliability
If thermally expandable microspheres containing hydrocarbon expansion agents are used, then sealability is improved, but content contamination with acrylonitrile occurs and safety is compromised
Solution Approach 1:
The invention extracts and eliminates the harmful thermally expandable microspheres containing acrylonitrile from the system, replacing them with a simple heating process that expands cork grains naturally without introducing harmful substances, thus maintaining sealability while ensuring safety
Solution Approach 2:
The invention converts the natural expansion capability of cork grains when heated into a beneficial effect, replacing the harmful chemical expansion mechanism with a physical thermal expansion process that improves sealability without contaminating the content
3Device complexity
If compression molding is performed without subsequent heating expansion, then manufacturing process is simple, but gas barrier performance is insufficient
Solution Approach 1:
The invention introduces a heating step that changes the physical parameters of the cork grains, causing them to expand and create a more effective gas barrier structure while maintaining processability through a relatively simple heating operation
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 method produces a cork stopper with enhanced sealability, safety, and cost-effectiveness, ensuring smooth screwing and removal while maintaining the natural cork's texture and environmental benefits.
Implementation Method 1
heating the intermediate to expand the cork grains
Implementation Method 2
the cork grains are expanded by microwave heating or high-frequency heating of the intermediate
Data Source
AI summary
An objective of the present invention is to provide a method for producing a cork stopper by compression molding cork grains, which can provide a cork stopper excellent in sealability and safety. There is provided a method for producing a cork stopper, comprising: mixing cork grains and an adhesive; compression molding the mixture to give an intermediate; and then heating the intermediate to expand the cork grains.