Printed Wiring Board Cutting Angle for Fiber Waste Reduction
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Solution Overview
Problem
The existing methods for manufacturing printed wiring boards with glass fiber reinforcement result in fiber waste and fuzzing during cutting, especially when using a shear apparatus, leading to increased costs and inefficiencies.
Innovation Solution
A method involving a cloth-like material woven with reinforced fibers at a 90-degree angle, where the material is tilted during cutting to ensure the cut portion crosses the fiber threads at an angle between 5 and 30 degrees, preventing fiber waste and fuzzing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cutting is performed in the same direction as the fiber direction of the glass fiber, then the cutting process is simple and efficient, but the glass fiber cannot be completely cut, causing fuzzing and fiber waste
Solution Approach 1:
The invention applies asymmetry by cutting the glass cloth at an angle not orthogonal to the fiber direction. Specifically, the cutting line is set at an angle of 5 to 30 degrees relative to the fiber direction, creating an asymmetric cutting pattern that ensures complete fiber切断 while minimizing waste. This asymmetric approach resolves the contradiction by preventing fuzzing and fiber waste without significantly reducing cutting efficiency.
Solution Approach 2:
The invention changes the cutting angle parameter from the conventional orthogonal (90 degrees) to a specific range of 5 to 30 degrees relative to the fiber direction. This parameter change transforms the cutting process to achieve complete fiber切断 while reducing fiber waste and fuzzing, thereby resolving the technical contradiction between cutting efficiency and material loss.
2Ease of manufacture
If the fiber direction is arranged along the circumferential edge portion of the board, then the manufacturing process is simplified, but a special apparatus is required to cut at a bias direction, thereby incurring costs
Solution Approach 1:
The invention inverts the conventional approach by not arranging the fiber direction along the circumferential edge, but rather cutting at an angle to the fiber direction that is already arranged conventionally. This inversion allows using standard cutting apparatus while achieving the desired bias direction effect, thereby resolving the contradiction between manufacturing simplicity and device complexity.
3Manufacturing precision
If cutting is performed orthogonally to the fiber direction to prevent fuzzing, then fiber waste is reduced, but the cutting process becomes more complex and time-consuming
Solution Approach 1:
The invention optimizes the cutting angle parameter to a specific range of 5 to 30 degrees relative to the fiber direction, which balances cut precision and processing time. This optimized parameter achieves complete fiber切断 and reduced fuzzing while maintaining efficient cutting speed, thereby resolving the contradiction between manufacturing precision and processing time.
Data Source
AI summary
A printed wiring board having a sheet material including a cloth-like material woven of reinforced fiber. An angle between a warp thread and a weft thread of the reinforced fiber of the sheet material is 90 degrees. In the sheet material, threads configuring the cloth-like material are cut so that one side of a circumferential edge portion of the sheet material is tilted leftward or rightward at an angle no smaller than 5 degrees and no larger than 30 degrees and a length of a cut portion obtained by cutting out the cloth-like-material configuration threads aligned on a cutting blade with the cutting blade is longer by 0.3 mm to 6.3 mm than a total length of a clearance between an upper blade and a lower blade configuring the cutting blade for cutting the cloth-like material and a thickness of the cloth-like-material configuration threads aligned on the cutting blade.