Solvent-Mediated Substrate Separation from Adhesive Carrier
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Solution Overview
Problem
Existing methods for separating substrates from adhesives and carriers often result in adhesive residue on the substrates, leading to increased processing time and mechanical damage due to incomplete separation and redeposition of adhesive.
Innovation Solution
Exposing the adhesive interface to a solvent composition that selectively weakens the bond strength between the substrate and adhesive while maintaining the bond strength between the adhesive and carrier, allowing for clean separation without excessive adhesive dissolution or redeposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing separation methods are used, then substrates can be separated from carriers, but adhesive residue remains on substrates causing increased processing time and mechanical damage
Solution Approach 1:
The patent changes the chemical parameters of the separation system by introducing a solvent composition with specific properties (pH range, solvent types) that selectively modifies the adhesive's bonding characteristics. This allows the adhesive to release from the substrate while maintaining its structural integrity on the carrier, eliminating residue problems
Solution Approach 2:
The solvent composition acts as an intermediary substance that mediates between the adhesive and substrate. It temporarily alters the adhesive's bonding properties during separation, enabling clean release without damaging the substrate or leaving residue, then evaporates without remaining on the substrate
2Ease of operation
If strong separation force is applied, then substrates can be separated from adhesive, but mechanical damage occurs to substrates
Solution Approach 1:
The patent changes the bonding parameters of the adhesive through solvent treatment, reducing the bond strength to a level that allows easy separation with minimal force. This eliminates the need for strong mechanical forces that would damage the substrate while still achieving complete separation
3Strength
If adhesive bond strength is increased to ensure substrate attachment, then substrate securing is improved, but separation becomes difficult and causes damage
Solution Approach 1:
The patent employs parameter changes by introducing a solvent that selectively modifies the adhesive's bonding parameters. The solvent weakens the adhesive-substrate bond while preserving the adhesive-carrier bond, enabling easy separation after processing without compromising initial attachment strength
Solution Approach 2:
The patent applies dynamics by making the adhesive's bonding characteristics changeable over time. The adhesive maintains strong bonding during processing, then becomes easily separable after solvent treatment, creating a dynamic bonding system that adapts to different process stages
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
Facilitates clean and efficient separation of substrates from adhesives, reducing processing time and mechanical damage by controlling the solvent composition and soaking time to maintain adhesive integrity on the carrier during substrate transfer.
Implementation Method 1
exposing at least the first interface to a solvent composition for a time period to selectively reduce the first bond strength below the pre-determined force while not reducing the second bond strength below the pre-determined force
Data Source
AI summary
The present disclosure relates to separating parts (e.g., sliders and/or row bars) from an adhesive and carrier during the manufacture of parts to be used in a data storage device such as a hard disc drive.