Press Pad for PCB Lamination Heat and Pressure Control
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Solution Overview
Problem
In laminating printed circuit boards, existing press pads fail to effectively manage heat distribution and pressure equalization, leading to uneven lamination and potential damage from dust and debris, especially when handling multi-layer boards and flexible circuits.
Innovation Solution
A press pad system comprising a planar pad made of paper or cotton with polyimide-based release film sheets attached using an acrylic-based adhesive containing thermoplastic polyolefin and methyl acrylate, which facilitates electrostatic cleaning, thermal treatment, and hydraulic axis pressure distribution, ensuring even heat management and pressure application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional press pads are used for lamination, then basic pressure application is achieved, but heat distribution is uneven and dust/debris damage occurs
Solution Approach 1:
The press pad uses a composite structure combining a porous core layer (for heat distribution and pressure equalization) with a protective outer layer (for dust and debris protection). This composite material approach enables simultaneous achievement of uniform heat distribution, even pressure application, and contamination prevention, resolving the technical contradiction between temperature control and manufacturing precision.
2Strength
If pressure is applied to fuse layers, then lamination bonding is achieved, but dust and debris can cause damage to the board surfaces
Solution Approach 1:
The press pad incorporates a protective outer layer that acts as a barrier before the lamination process begins. This layer prevents dust and debris from contaminating the board surfaces during pressure application and heat treatment, while the porous core layer simultaneously ensures uniform pressure distribution for strong layer bonding. The protective layer is removed after lamination completes.
3Stress or pressure
If high pressure is used for lamination, then layer fusion is achieved, but heat management becomes difficult causing temperature rise
Solution Approach 1:
The press pad employs a porous core layer made of materials such as porous polymer, porous metal, or porous ceramic. This porous structure provides high surface area-to-volume ratio that facilitates efficient heat dissipation and thermal management during high-pressure lamination. The porosity allows heat to conduct uniformly through the pad while preventing excessive temperature rise, enabling effective pressure application without compromising temperature control.
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 press pad system ensures flatter printed circuit boards with better conformation, prevents dust interference, and manages temperature rise effectively during lamination, improving the quality of multi-layer rigid and flexible circuits and LCDs by providing uniform pressure and heat control.
Implementation Method 1
The first and second release film sheets are coupled to the first and second surfaces, respectively, using an acrylic-based adhesive containing thermoplastic polyolefin and methyl acrylate
Implementation Method 2
facilitates electrostatic cleaning, thermal treatment, and hydraulic axis pressure distribution
Implementation Method 3
manages temperature rise effectively during lamination, providing uniform pressure and heat control
Data Source
AI summary
A method of manufacturing a press pad is disclosed. The method includes: providing a planar pad having a first surface and a second surface opposite to the first surface and a release film sheet, the release film sheet including a polyimide-based film; cleaning the planar pad, the cleaning including electrostatically removing particulates from surfaces of the planar pad; and attaching a release film sheet to the first surface of the planar pad, the release film sheet being attached to the first surface using an acrylic-based adhesive containing thermoplastic polyolefin and methyl acrylate.