Protective Cover Supply Sheet for Stable MEMS Pick-Up
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Solution Overview
Problem
The existing methods for supplying protective cover members for microelectromechanical systems (MEMS) face instability in pick-up performance due to increased adhesive force over time, leading to difficulties in peeling and picking up the protective cover members from substrate sheets.
Innovation Solution
A member supplying sheet with a substrate layer and an adhesive layer, where the carrier film has a surface free energy of 20 mJ/m2 or more and the adhesive layer has a tack force of 100 mN/mm2 or less, ensuring stable peeling and pick-up performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesive layer is used to adhere the carrier film to the substrate layer, then the protective cover members can be supplied on the substrate sheet, but the adhesive force increases over time causing instability in pick-up performance
Solution Approach 1:
The invention controls the tack force of the adhesive layer to be 100 mN/mm² or less, and the surface free energy of the carrier film to be 20 mJ/m² or more. By adjusting these physical parameters, the adhesive maintains sufficient initial bonding strength while preventing excessive adhesive force development over time, thereby ensuring stable pick-up performance throughout the storage period.
2Strength
If the adhesive force increases over time, then the bonding between carrier film and substrate layer becomes stronger, but the peeling and pick-up operations become difficult
Solution Approach 1:
The invention specifies that the adhesive layer shall have a tack force of 100 mN/mm² or less, and the carrier film shall have a surface free energy of 20 mJ/m² or more. This parameter control ensures that the bonding strength is sufficient for supply and storage, but not so strong as to prevent easy peeling and pick-up operations throughout the product lifecycle.
3Reliability
If the adhesive is allowed to fit closely to the member sheet over time, then the adhesion improves, but the pick-up performance becomes unstable
Solution Approach 1:
The invention controls the surface free energy of the carrier film to be 20 mJ/m² or more and the tack force of the adhesive layer to be 100 mN/mm² or less. These parameter specifications prevent the adhesive from becoming too strong over storage time, thereby maintaining consistent pick-up performance whether the product is used immediately or after extended storage periods.
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 member supplying sheet enhances the pick-up performance by maintaining a controlled tack force, allowing for smooth and reliable peeling of protective cover members, thereby improving the efficiency of the pick-up process.
Implementation Method 1
the carrier film is adhered to the substrate layer via the adhesive layer
Data Source
AI summary
A member supplying sheet includes two or more protective cover members each configured to be placed on a face of an object that has an opening on the face; and a substrate sheet with the two or more protective cover members arranged on a surface thereof. The protective cover members each include a laminate including: a protective membrane shaped to cover the opening when the protective cover member is placed on the face; and a carrier film. The substrate sheet includes a substrate layer and an adhesive layer laminated on the substrate layer. The carrier film is adhered to the substrate layer via the adhesive layer. The surface free energy of the carrier film on a surface thereof on the side closer to the substrate sheet is 20 mJ/m2 or more. The adhesive layer has a tack force of 100 mN/mm2 or less.