Tabbed Container Liner Alignment via Printed Pattern
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Solution Overview
Problem
Existing container closure systems face challenges in recycling and resealing, particularly when caps and containers are made from the same material and density, and there is a difficulty in incorporating visible tabs and ink patterns without compromising adhesive strength or increasing production costs.
Innovation Solution
A primary laminate sheet with a transparent top layer carrying a printed pattern that obscures tabstock strips, allowing for visible ink patterns and tabs within the circumference of container closure liners, enabling easy identification and alignment during manufacturing, and facilitating recycling by matching cap and container materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cap is made from the same material and density as the container, then recycling is simplified, but the cap becomes difficult to distinguish from the container for identification purposes
Solution Approach 1:
The patent applies color changes by making the cap transparent while keeping the container opaque (or different color). This visual distinction allows consumers to easily identify and separate the cap from the container during recycling, while both can be made from the same material family (e.g., both PET) to facilitate recycling. The transparency creates a clear visual difference without requiring different materials.
2Loss of information
If ink is introduced into the adhesive layer to create visible patterns, then the top surface becomes colored and visible, but the adhesive strength decreases compromising structural integrity
Solution Approach 1:
The patent segments the laminate structure into separate functional layers: a transparent adhesive layer that maintains bonding strength, and a separate opaque top layer or coating that provides the visible pattern. This segmentation allows each layer to perform its function optimally - the adhesive layer remains strong and transparent for bonding, while the pattern layer provides visibility without compromising the adhesive properties.
Solution Approach 2:
The patent uses composite materials by combining a transparent adhesive layer with an opaque pattern layer or coating. This composite structure allows the adhesive to maintain its bonding function while the composite adds the visual pattern. The combination of materials (transparent polymer adhesive with opaque pigment or coating) achieves both strength and visibility without the ink weakening the adhesive bond.
3Loss of information
If a transparent cap is used to display instructions and logos, then identification is improved, but the cap and container cannot be recycled together as they are different materials
Solution Approach 1:
The patent applies color changes by making the cap transparent while keeping the container opaque (or different color). This visual distinction allows consumers to easily identify and separate the cap from the container during recycling, while both can be made from the same material family (e.g., both PET) to facilitate recycling. The transparency creates a clear visual difference without requiring different materials.
4Ease of manufacture
If the tabstock is visible through the top layer, then alignment during slitting is easy, but the ink pattern cannot be effectively displayed
Solution Approach 1:
The patent segments the laminate structure into separate functional layers: a transparent adhesive layer that maintains bonding strength, and a separate opaque top layer or coating that provides the visible pattern. This segmentation allows each layer to perform its function optimally - the adhesive layer remains strong and transparent for bonding, while the pattern layer provides visibility without compromising the adhesive properties.
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 allows for effective recycling of caps and containers together while maintaining the ability to reseal containers, as the printed pattern on the transparent cap obscures the tabstock, ensuring structural integrity and visibility of the ink pattern, thus addressing the challenges of visibility, resealing, and recycling.
Implementation Method 1
An induction heat process heats the metal foil and in turn activates the heat sensitive adhesive layer or melts the plastic layer so that on cooling the seal closes the mouth of the container.
Data Source
Figure 1~2
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AI summary
A continuous laminate web (1b) for forming induction heat-sealable closures for containers has several strips (8) of longitudinally extending tabstock material arranged across the width sandwiched between a seal laminate substructure (1) and a continuous plastics sheet (10). The continuous plastics sheet is adhered to the facing surface of the tabstock and the top surface (7) of the seal laminate substructure suitably by an extended adhesive (9), while the tabstock is not adhered to the top surface of the seal laminate substructure. The plastics sheets is opaque and carries a printed pattern that is in register with the tabstock and the invention provides for means of aligning the tabstock with the printed pattern in carrying out the step of adhering the continuous plastics sheet to the tabstock and seal laminate, for instance by providing registration means at a margin (12) of one of the sheets, and detector means (40) for locating the registration means.