Flexible Laminate Integrated Pressure-Release Valve
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Solution Overview
Problem
Existing one-way pressure-release valves in packaging laminates are unreliable for venting positive pressure differentials and insufficient for products with high off-gassing rates, such as ground coffee, due to design limitations and polymer properties, leading to potential package deformation and quality issues.
Innovation Solution
A flexible multilayer laminate with an integrated one-way pressure-release valve featuring a liquid film and inflatable outlet tube, designed with specific adhesive patterns and score lines to achieve low opening pressure and high output capacity, allowing gas to escape while preventing backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vacuum packing is used for oxygen-sensitive products, then product protection from oxidation is improved, but gas-producing products cannot be packaged without prior degassing which increases time and cost
Solution Approach 1:
The laminate is divided into multiple functional layers including a valve pocket region that is separated from the main laminate structure. This segmentation allows the valve to function independently as a gas release mechanism while the rest of the package maintains vacuum sealing, enabling immediate packaging of gas-producing products without prior degassing time
Solution Approach 2:
A one-way valve mechanism is introduced as an intermediary element within the laminate structure. This valve acts as a mediator that selectively allows gas to escape during packaging while preventing oxygen from entering, thereby protecting oxygen-sensitive products without requiring extended degassing periods
2Reliability
If a one-way valve is integrated in the flexible package structure to vent positive pressure, then overpressure issues are avoided, but the valve must withstand negative pressure differences without failing to prevent oxygen ingress
Solution Approach 1:
The valve mechanism is constructed using composite materials including a flexible membrane layer and a rigid support structure. This composite design allows the valve to flex and open under positive pressure while maintaining structural integrity to resist negative pressure differences, preventing oxygen ingress during vacuum packaging
Solution Approach 2:
The valve pocket is designed with a curved, three-dimensional structure that provides structural support and flexibility. This curvature allows the valve membrane to deform appropriately under pressure differentials while maintaining sealing integrity, enabling reliable operation during both positive and negative pressure conditions
3Productivity
If existing one-way pressure-release valves are used in packaging laminates, then pressure venting is provided, but they are unreliable for high off-gassing products like ground coffee due to design limitations and polymer properties
Solution Approach 1:
The valve design parameters including opening pressure, membrane thickness, and pocket volume are optimized to match the specific off-gassing characteristics of high-productivity products like ground coffee. This parameter optimization ensures the valve can handle high gas flow rates while maintaining reliable operation throughout the product shelf life
Solution Approach 2:
The valve is pre-positioned and pre-tested within the laminate structure during manufacturing to ensure it will function reliably under the specific pressure and temperature conditions expected during product storage and distribution. This preliminary setup guarantees consistent performance for high off-gassing products
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 provides reliable and reproducible pressure release at low opening pressures, ensuring the integrity of packaged products by preventing overpressure and maintaining seal integrity during the entire packaging life cycle, even for high off-gassing products like ground coffee.
Implementation Method 1
a liquid film disposed in the valve region
Implementation Method 2
an inflatable outlet tube formed by the first and second oriented polymer layers
Data Source
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AI summary
The present invention is related to flexible multilayer laminates having an integrated, one-way pressure-release valve for use in a sealed container for packing gas- producing products. The pressure-release valve is partly disconnected from the rest of the laminate, forming an inflatable outlet tube with at least one large outlet opening and lifting off from the laminate under increased pressure in the pack. The one-way pressure- release valve allows for pressure release at low minimum opening pressure in a reliable and reproducible way.