Removable Adhesive Label With Water-Affinity Polymeric Film
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Solution Overview
Problem
Current adhesive labels for reusable and recyclable beverage bottles lack high clarity visual aesthetics, abrasion resistance, and fail to detach properly during washing processes, especially in hot aqueous caustic solutions, leading to equipment clogging.
Innovation Solution
A label comprising a thermoplastic polymer film with a glass transition temperature between 35 to 105°C and a tensile modulus that decreases significantly when heated or immersed in water, combined with an adhesive that loses adhesion strength at elevated temperatures, ensuring the label detaches from the container without clogging washing equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If paper labels are used, then cost is reduced, but visual clarity and abrasion resistance deteriorate
Solution Approach 1:
The label uses a composite structure combining a polymeric film layer (providing visual clarity and abrasion resistance) with a paper-like adhesive layer (providing cost-effectiveness and adhesive properties). This composite approach allows the label to achieve both high visual clarity and abrasion resistance while maintaining cost-effectiveness, resolving the contradiction between material cost and performance reliability.
2Reliability
If stretched thermally shrinkable polymeric labels are used, then visual clarity and abrasion resistance are improved, but removability deteriorates due to curling into needle shape
Solution Approach 1:
The patent modifies the physical parameters of the polymeric film by controlling its glass transition temperature (35-105°C) and tensile modulus to enable proper detachment during washing. The film is designed to maintain dimensional stability during application but undergo controlled dimensional change during washing, preventing the needle-shaped curling problem while preserving visual clarity and abrasion resistance.
Solution Approach 2:
The label employs different material properties in different layers: the polymeric film layer provides visual clarity and abrasion resistance, while the adhesive layer is formulated with specific adhesive strength characteristics that enable easy detachment. This local differentiation of material qualities allows each layer to perform its specific function optimally without compromising overall label performance.
3Ease of manufacture
If conventional adhesive labels are used, then application is simple, but they fail to detach properly during hot aqueous caustic washing
Solution Approach 1:
The adhesive layer is formulated with temperature-dependent adhesion characteristics, where adhesive strength is maintained at ambient temperatures for secure application but decreases at elevated temperatures (50-90°C) during washing. This parameter change in adhesive properties enables the label to remain securely attached during application while detaching reliably during hot aqueous caustic washing, resolving the contradiction between application simplicity and washing removability.
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 label provides high clarity, abrasion resistance, and effective removability from containers during washing, preventing equipment clogging and allowing for reuse and recycling of bottles.
Implementation Method 1
a film having a first surface and a second surface and comprising a first film layer... the first film layer comprises at least one thermoplastic polymer where the thermoplastic polymer has a glass transition temperature in the range of 35 to 105° C.
Implementation Method 2
the first film layer has an absolute areal dimensional change (American Society for Testing and Materials, hereinafter 'ASTM' D1204) of at least 4% after immersion in water at a temperature of about 80° C. for at least about 3 minutes
Data Source
AI summary
An adhesive label includes a polymeric first film layer that has an affinity for water. The label is useful in various labeling applications and especially adhesive labeling of reusable and recyclable containers which require removal of the label during a washing process in a warm or hot washing fluid.