Surface-Modified Teflon Flexible Circuit Board Adhesion
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Solution Overview
Problem
Flexible printed circuit boards (FPCBs) face challenges in maintaining heat resistance and low dielectric constant properties, especially when using Teflon films, as they are prone to peeling during manufacturing and storage due to releasability issues.
Innovation Solution
The implementation of surface-modified Teflon films with metal oxide layers on the outer surfaces of the circuit patterns and base sheets, along with adhesive polypropylene films, enhances the adhesive properties between the protection sheets and base sheets, preventing peeling and ensuring stable product preservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Teflon film is used as base board to achieve low dielectric constant characteristics, then signal loss is reduced, but adhesive property deteriorates causing peeling during manufacturing and storage
Solution Approach 1:
The patent applies surface modification only to specific regions of the Teflon film where adhesion is needed (contact areas with protection sheets and circuit patterns), while maintaining the bulk Teflon properties for low dielectric constant. This localized treatment resolves the contradiction by improving adhesion only where required without affecting the overall electrical performance.
Solution Approach 2:
The patent creates a composite structure by combining Teflon film with surface-modified layers (metal oxides, organic compounds, or roughened surfaces). This composite approach maintains the excellent electrical properties of Teflon while adding surface characteristics that provide sufficient adhesion for protection sheets and circuit patterns.
2Strength
If surface modification is applied to improve adhesive property, then peeling is prevented, but manufacturing complexity increases
Solution Approach 1:
The patent modifies surface parameters of the Teflon film (surface energy, roughness, or chemical composition) through relatively simple processes such as plasma treatment, corona discharge, or deposition of thin metal oxide layers. These parameter changes achieve the required adhesion improvement without requiring complex multi-step manufacturing processes.
3Ease of operation
If Teflon film with releasability is used to ensure easy separation of protection sheets, then ease of operation improves, but adhesive property deteriorates causing peeling during storage
Solution Approach 1:
The patent creates different adhesion characteristics in different regions: strong adhesion in areas requiring stability (base sheet to protection sheet during manufacturing and storage) and controlled releasability in areas where separation is needed (circuit pattern areas). This spatial differentiation of adhesion properties resolves the contradiction between ease of separation and prevention of peeling.
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 approach allows for the effective use of Teflon films with high heat resistance and low dielectric constants, improving the reliability and manufacturing efficiency of FPCBs by maintaining the integrity of the circuit patterns and reducing signal loss during high-temperature processes.
Implementation Method 1
A portion of the first base sheet exposed to the first protection sheet is surface-modified
Implementation Method 2
the base board is required to have heat resistance. Accordingly, a polyimide film is used as the base board in order to satisfy the aforementioned required heat resistance of the base board
Implementation Method 3
the base board may be required to have low dielectric constant characteristics in order to prevent the transmitted electrical signal from being lost
Implementation Method 4
A first adhesive sheet is interposed between the first base sheet and the intermediate Teflon film to bond the intermediate Teflon film to the first base sheet
Data Source
AI summary
A flexible printed circuit board according to the present disclosure includes: a first base sheet, a second base sheet, and a first protection sheet. The first base sheet includes a first Teflon film and a first circuit pattern disposed on the first Teflon film. The second base sheet includes a second Teflon film and a second circuit pattern disposed on the second Teflon film, and is laminated on the first base sheet. The first protection sheet covers the first base sheet. A portion of the first base sheet that is exposed to the first protection sheet is surface-modified.