Self-adhesive Label Valve with Release Chimney Geometry
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Solution Overview
Problem
Existing packaging solutions for food products in sealed containers face issues with sudden pressure release during heating, leading to film rupture and complex opening, and previous valve designs are costly and inefficient in material usage.
Innovation Solution
A laminated tape carrier with a pressure-activated adhesive and specific punch geometry for the label-valve, where the anti-adherent carrier and self-adhesive tape intersect at points to create a progressive release chimney for vapors, ensuring a gradual pressure release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve is pre-applied to release pressurized vapors, then film rupture is prevented, but the valve structure becomes complex and costly
Solution Approach 1:
The valve is segmented into two functional layers: an anti-adherent carrier layer that defines the release opening perimeter, and a self-adhesive tape layer that provides sealing. This segmentation allows each layer to perform its specific function independently while working together to achieve reliable pressure release without complex three-dimensional structures.
Solution Approach 2:
The invention extracts the essential valve function from complex mechanical structures and reduces it to a two-layer planar configuration. The anti-adherent carrier extracts only the necessary perimeter definition function, while the self-adhesive tape extracts the sealing function, eliminating unnecessary structural complexity.
2Reliability
If special release valves are designed and pre-applied, then controlled vapor release is achieved, but material waste increases and application becomes complicated
Solution Approach 1:
The anti-adherent carrier and self-adhesive tape are merged into a single laminated structure that is applied in one operation. This merging eliminates the need for separate application steps and reduces material waste by optimizing the use of both carrier and adhesive materials in a unified configuration.
Solution Approach 2:
The valve structure is preliminarily prepared as a laminated tape with pre-defined geometry and adhesive properties. The anti-adherent carrier is preliminarily shaped to match the release opening perimeter, and the self-adhesive tape is preliminarily bonded to it, enabling direct application without additional processing steps.
3Reliability
If the valve geometry is optimized for gradual vapor release, then sudden pressure release is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The valve exhibits local quality through its two-layer structure: the anti-adherent carrier provides local non-stick properties at the release opening perimeter, while the self-adhesive tape provides local bonding properties. This local differentiation of material properties enables gradual vapor release through the anti-adherent interface without requiring complex overall geometry.
Solution Approach 2:
The invention changes the physical parameters of the valve by using materials with different surface properties (anti-adherent vs. adhesive). This parameter change enables controlled vapor release through the anti-adherent carrier layer while maintaining manufacturing simplicity through standard lamination and punching processes.
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 new geometry ensures a reliable and gradual release of pressurized vapors, preventing film rupture and simplifying the packaging process while reducing material waste and application complexity.
Implementation Method 1
comprising a layer of pressure-activated adhesive and a central membrane adhering to the adhesive layer
Implementation Method 2
at least one cut (3) intersecting the geometrical projection of the perimeter (4) defining the island of tape carrier (C)... ensures a reliable and gradual release of pressurized vapors
Data Source
AI summary
Self-adhesive label valves are disclosed having release chimneys in correspondence of a plurality of intersection cuts in a membrane-island of film (tape) carrier (C) with cuts made in the overlying self-adhesive label made of polymeric film (E) with an adhesive layer. All are inscribed within (i.e. inside) the perimeter of the membrane-island, and are destined to overlie so as to occlude pre-formed release openings in the packaging film of heatable food, and ensure in an outstandingly reliable manner a gradual release of vapors while heating, without causing an undesirable collapse of the packaging film.