Thin Film Processing Using Two-State Adhesive Layer
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Solution Overview
Problem
Mass producing thin films with uniform shape and geometry within tight tolerances is challenging due to stretching and distortion, complex tooling requirements, and issues with waste material removal, particularly for films with thicknesses of one to two mils or less.
Innovation Solution
A method involving attaching a thin film layer to a carrier using an adhesive layer with a two-state adhesive, where the adhesive force is stronger in one state and weaker in another, allowing for precise sectioning and subsequent release of the thin film sections without deformation or loss of vacuum force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum is applied to secure the thin film during cutting, then the film can be held stationary, but the vacuum force decreases as material is cut away, causing the film to shift and be cut incorrectly
Solution Approach 1:
The adhesive layer undergoes a state change from a first state with strong adhesive force during cutting to a second state with reduced adhesive force for release. This parameter change in adhesive strength allows the film to be securely held during cutting while enabling easy release afterward without film deformation.
Solution Approach 2:
The adhesive layer acts as an intermediary between the thin film and the carrier layer. It provides strong bonding during cutting to prevent film shifting, then allows controlled release after cutting, mediating the interaction between the film and carrier to resolve the force contradiction.
2Manufacturing precision
If pressure-sensitive adhesive tape is used to secure the thin film, then the film remains stationary during cutting, but the part becomes deformed during removal due to tensile forces
Solution Approach 1:
The adhesive layer changes its adhesive force parameter from strong (first state) during cutting to weak (second state) during release. This enables secure positioning during cutting while allowing deformation-free removal, directly resolving the contradiction between position stability and shape preservation.
3Manufacturing precision
If custom vacuum fixtures with multiple manifolds are used to section thin films, then proper shaping within tight tolerances is achieved, but the fixture cost is extremely high and requires large lead times for design changes
Solution Approach 1:
The adhesive layer provides universal bonding capability that works for different thin film shapes and sizes without requiring custom fixtures. The same simple carrier with adhesive layer can accommodate various film geometries, eliminating the need for complex, shape-specific vacuum fixtures and enabling quick design changes.
Solution Approach 2:
The adhesive layer is a low-cost, consumable material that replaces expensive, durable custom fixtures. While the adhesive is used once per application, its low cost and ease of replacement make it more economical than designing and manufacturing custom vacuum fixtures for each application.
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 the production of well-formed thin film parts within design tolerances without stretching or deformation, using standard equipment and reducing the need for custom tooling, while maintaining precise control over the release process.
Implementation Method 1
the adhesive layer comprises a material having a first adhesive force when in a first state and a second adhesive force when in a second state
Data Source
AI summary
A method for processing a thin film layer, for example to form an ink jet printhead, can include the use of an adhesive layer that can be converted from a first state having a first adhesive force to a second state having a second adhesive force, where the first state is stronger than the second state. Conversion from the first state to the second state can be performed using a suitable treatment. In an embodiment, the adhesive layer may be a thermal release material that is converted during a heat treatment. In another embodiment, the adhesive layer may be a layer that is sensitive to ultraviolet (UV) light, and is converted during exposure to UV light emitted by a UV light source.