Carrier Release via Controlled Adhesion and Thermal Segmentation
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Solution Overview
Problem
Existing methods for releasing carriers from assemblies, particularly in the processing of liquid crystal display components, face challenges in efficiently reducing adhesion strength to prevent damage during thermal expansion and facilitate easy release without causing crinkling or distortion of plastic support sheets.
Innovation Solution
A method involving the use of adhesive elements with controlled adhesion properties, where mechanical compression and controlled heating create gas pockets to reduce adhesion strength, allowing for the release of carriers without excessive force, and further heating expands the adhesive to break contact, enabling easy separation while preventing crinkling of plastic support sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heating is applied to reduce adhesion strength for carrier release, then the adhesion strength is reduced facilitating release, but thermal expansion may cause crinkling or distortion of plastic support sheets
Solution Approach 1:
The patent segments the heating process into two distinct stages: first heating under mechanical compression to prevent crinkling while partially reducing adhesion, then releasing compression and applying further heat to complete the adhesion reduction. This segmentation allows each heating stage to serve a specific function without causing damage.
Solution Approach 2:
The patent applies preliminary mechanical compression before and during the first heating stage to prevent crinkling of the plastic support sheet. This preliminary protective action ensures the sheet maintains its shape stability before the adhesion reduction process begins, and is released only after the critical thermal phase is complete.
2Shape
If mechanical compression is applied during heating to prevent crinkling, then shape stability is maintained, but the area of contact between adhesive and carrier remains high reducing release efficiency
Solution Approach 1:
The patent divides the process into two sequential phases: Phase 1 applies both compression and heat to maintain shape while partially reducing adhesion; Phase 2 releases compression and applies additional heat to further reduce adhesion and create gas pockets. This segmentation allows the contact area to be reduced only when shape stability is no longer required.
Solution Approach 2:
The patent employs periodic action by alternating between compression (preventing crinkling) and release (allowing gas pocket formation) during the heating process. The compression is applied periodically during the critical thermal expansion phase, then released to allow the adhesive to expand and reduce contact area for efficient release.
3Ease of operation
If adhesion strength is strongly reduced to facilitate carrier release, then release becomes easy, but the assembly may be damaged or distorted during the process
Solution Approach 1:
The patent applies preliminary controlled heating under compression to partially reduce adhesion strength in a controlled manner that does not damage the assembly. This preliminary reduction prepares the adhesive for complete release while maintaining assembly integrity, preventing sudden or forceful release that could cause damage.
Solution Approach 2:
The patent carefully controls and changes the heating parameters (temperature, duration, pressure) to achieve progressive adhesion reduction. By adjusting these parameters in stages—first under compression, then without compression—the process achieves complete adhesion reduction and easy release while preventing damage to the assembly through controlled thermal exposure.
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
This method effectively reduces adhesion strength to facilitate carrier release without damaging the assembly, preventing crinkling and ensuring the integrity of the liquid crystal display components, allowing for efficient processing and assembly of LCD devices.
Implementation Method 1
generating pockets of gas where the adhesive element contacts the carrier and/or assembly thereby reducing the area of contact between solid material of the adhesive element and the carrier and/or assembly
Implementation Method 2
thermally expanding the solid material of the adhesive element to break contact between the solid material of the adhesive element and the carrier and/or assembly in locations between said gas pockets
Data Source
AI summary
A technique comprising: providing an assembly temporarily adhered on opposite sides to respective carriers by respective adhesive elements, the assembly including at least one plastic support sheet; heating the assembly while mechanically compressing the assembly between the carriers, wherein the strength of adhesion of one of said adhesive elements to the respective carrier and/or to the assembly is partially reduced during said heating of the assembly under mechanical compression; and wherein the strength of adhesion of the said adhesive element to the carrier and/or to the assembly is further reducible by further heating the said adhesive element after partially or completely relaxing the pressure at which the assembly is mechanically compressed between the two carriers.