Pressure Sensitive Adhesive Tape With Heat-Generating Element
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Solution Overview
Problem
Pressure sensitive adhesive tapes used in recycling and reuse of electronic devices and appliances face challenges in efficient dismantling without causing thermal damage to adherends, as existing methods either fail to sufficiently heat the tape for easy peeling or lead to thermal degradation.
Innovation Solution
A pressure sensitive adhesive tape comprising a heat-generating element and a melt-softening layer with an inorganic hollow filler, allowing for easy heating and peeling while preventing thermal damage, by generating heat internally through electrical conduction and storing heat to reduce adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If heat is applied from the outside to peel off the pressure sensitive adhesive tape, then the tape can be separated from adherends, but thermal degradation or thermal damage occurs to the adherend
Solution Approach 1:
The pressure sensitive adhesive tape is divided into distinct functional layers: a heat-generating element layer, a melt-softening layer containing thermoplastic resin and inorganic hollow filler, and a pressure sensitive adhesive layer. This segmentation allows the heat-generating element to be isolated from the adherend, with the melt-softening layer acting as a thermal buffer that absorbs heat locally to facilitate peeling without transmitting excessive heat to the adherend.
Solution Approach 2:
The melt-softening layer serves as an intermediary between the heat-generating element and the adherend. It absorbs and distributes the generated heat locally, softening the adhesive to enable peeling while preventing direct thermal contact with the adherend. The inorganic hollow filler in this layer further mediates heat distribution and provides thermal insulation.
2Productivity
If the amount of heat generated is increased to ensure sufficient heating of the tape, then peeling becomes easier, but thermal degradation or thermal damage to the adherend increases
Solution Approach 1:
The heat-generating element and melt-softening layer are positioned specifically at the interface between the adhesive tape and the adherend, creating a localized heating zone exactly where peeling is needed. This local quality concentration ensures efficient heat utilization for peeling without dispersing heat to other areas, including the adherend, thereby preventing thermal degradation.
Solution Approach 2:
The melt-softening layer utilizes phase transition of the thermoplastic resin from solid to molten state upon localized heating. This phase change absorbs significant heat energy (latent heat of fusion), providing a self-regulating mechanism that facilitates peeling through resin softening while the phase transition process itself limits temperature rise that could damage the adherend.
3Strength
If the pressure sensitive adhesive tape is designed for strong adhesion to ensure reliable bonding, then bonding strength increases, but difficulty of removal increases
Solution Approach 1:
The adhesive system transitions from a static strong-bonding state during assembly to a dynamic softened state during removal. The melt-softening layer remains solid during normal bonding operations, providing strong adhesion. Upon application of heat during removal, the thermoplastic resin in the melt-softening layer undergoes phase transition to a molten state, dynamically reducing adhesive strength and enabling easy peeling.
Solution Approach 2:
The physical state and mechanical properties of the melt-softening layer change dramatically with temperature. During assembly, the layer is in a solid state with high structural integrity, providing strong adhesion. During removal, heating causes the thermoplastic resin to transition to a molten state, fundamentally changing the adhesive parameters to enable easy separation while maintaining the original strong bonding capability.
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
Enables efficient and thermal-damage-free dismantling of adherends, facilitating the reuse of components by allowing the tape to be easily peeled off when heated, while maintaining adhesive strength during assembly.
Implementation Method 1
generating heat internally through electrical conduction
Implementation Method 2
heat-generating element... generating heat internally through electrical conduction
Implementation Method 3
storing heat to reduce adhesive strength
Data Source
AI summary
A pressure sensitive adhesive tape including at least a pressure sensitive adhesive layer, a heat-generating element, and a melt-softening layer adjacent to the heat-generating element in this order is provided. The melt-softening layer contains a thermoplastic resin and an inorganic hollow filler.