Cold Transfer Pressure Labels for Wash-Durable Garment Bonding
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Solution Overview
Problem
Heat transfer labels used in garment applications face issues such as discomfort, skin irritation, and damage to fabrics due to heat application, and are limited by the need for a heat source, which restricts their use and incorporation of heat-sensitive items like chemical or physical sensing devices.
Innovation Solution
A cold transfer pressure sensitive label with a pressure sensitive adhesive layer that provides wet adhesion greater than 10 N/in, allowing the label to remain on substrates through repeated washing and drying cycles, and enabling the incorporation of heat-sensitive items without the need for heat application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat transfer labels use hot melt adhesives to achieve strong bonding, then the label can be securely attached to the substrate, but the label feels stiff or rough at ambient temperature causing discomfort and skin irritation
Solution Approach 1:
The patent changes the fundamental parameter of adhesive activation from thermal (heat-activated hot melt adhesives) to mechanical (pressure-activated pressure-sensitive adhesives). This allows the adhesive to remain soft and flexible at ambient temperature while still achieving strong bonding through pressure application, eliminating the stiffness and roughness problems associated with cooled hot melt adhesives.
2Strength
If heat is applied to transfer the label on the garment, then the label can be bonded to the substrate, but it causes undesirable bond marks and may damage heat sensitive fabric materials
Solution Approach 1:
The patent extracts and eliminates the heat application step from the label transfer process. By using pressure-sensitive adhesives that activate through pressure rather than heat, the invention removes the source of harmful effects including bond marks, fabric discoloration, and damage to heat-sensitive materials while maintaining effective bonding capability.
3Ease of manufacture
If traditional heat transfer labels are used, then the label can be applied to substrates, but the heating requirement limits the use to areas where a heat source is readily available
Solution Approach 1:
The patent substitutes the thermal field (heat) with a mechanical field (pressure) for activating the adhesive. This replacement enables label application in any location without requiring heat sources, as pressure can be applied manually or with simple tools anywhere, dramatically increasing adaptability and versatility for field applications, events, and remote locations.
4Strength
If heat is used for the transfer process, then the label can be bonded to the substrate, but chemical or physical sensing devices and other heat-sensitive items can be damaged through exposure to heat
Solution Approach 1:
The patent converts the limitation of pressure-sensitive adhesives (requiring higher pressure for activation) into a benefit by enabling the integration of heat-sensitive components. The pressure application method, while requiring controlled force, does not generate the thermal damage that would harm sensing devices, tracking devices, or other heat-sensitive items, allowing their safe incorporation into the label structure.
5Ease of operation
If traditional pressure sensitive labels are used, then the label can be applied without heat, but the label will likely fall off the garment if the garment is subject to washing and drying
Solution Approach 1:
The patent employs composite material strategies by formulating pressure-sensitive adhesives with specific polymer compositions and additives that provide both pressure-activatable bonding and wash/dry durability. The adhesive layer is engineered as a composite system combining tackifiers, polymers, and functional additives that enable the label to withstand repeated washing and drying cycles while maintaining secure attachment, overcoming the traditional limitation of pressure-sensitive labels.
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 cold transfer pressure sensitive label provides comfort and durability, remaining on substrates during washing and drying while allowing the integration of sensitive items, eliminating the need for heat and enhancing usability in various applications.
Implementation Method 1
a pressure sensitive adhesive layer on the opposite side of the ink layer. The pressure sensitive adhesive has a wet adhesion to substrate greater than 10 N/in
Data Source
AI summary
The present invention relates to a pressure sensitive label for use in a cold transfer process that can be used for garment identification and labeling. The pressure sensitive label can be applied on textile surface or any other surfaces for which heat transfer is unfavorable or unavailable. The pressure sensitive label can remain on the substrate to which it is attached through repeated washing and drying cycles.