Inclined Heating Means for Uniform PCB Drying
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Solution Overview
Problem
Drying apparatuses for printed circuit boards face issues with uneven drying due to temperature differences across the workpiece when using horizontal heating methods, leading to inefficiencies and potential defects.
Innovation Solution
The drying apparatus employs inclined heating means on both the front and back surfaces of the workpiece, combined with gas injection systems that direct air obliquely to ensure uniform heating and drying, along with a reserve heating tank for preheating and a conveying mechanism to optimize the drying process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heating means is positioned horizontally to dry the workpiece, then the drying processing can be applied efficiently, but the temperature of the workpiece decreases with distance from the heating means causing in-plane temperature difference and uneven drying
Solution Approach 1:
The heating means is configured with an inclined surface rather than a horizontal surface, creating an asymmetric geometry that allows the heating surface to extend further toward the workpiece. This asymmetric design enables more uniform heat distribution across the workpiece surface while maintaining efficient drying capability.
Solution Approach 2:
The heating means transitions from a horizontal configuration to an inclined configuration, adding a vertical dimension to the heat distribution pattern. This dimensional change allows the heating surface to approach the workpiece at an angle, reducing temperature differences across the workpiece plane while maintaining drying efficiency.
2Manufacturing precision
If drying time is extended to remove liquid sufficiently, then drying quality improves, but production efficiency decreases
Solution Approach 1:
The inclined heating means is designed to pre-distribute heat more uniformly across the workpiece surface before the main drying phase, creating optimal conditions for rapid and uniform drying. This preliminary heat distribution prevents the need for extended drying time while ensuring high drying quality.
Solution Approach 2:
The inclination angle of the heating means is optimized to change the heat distribution pattern, creating more uniform temperature across the workpiece surface. This parameter optimization enables sufficient liquid removal in shorter time while maintaining high drying quality.
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 configuration reduces in-plane temperature differences and prevents uneven drying, enhancing the efficiency and effectiveness of the drying process while minimizing defects.
Implementation Method 1
heating means (heat source) used for the drying processing
Implementation Method 2
drying processing is applied to the workpiece... the liquid remaining may cause a defect
Implementation Method 3
gas injection means opposed to the front surface of the workpiece and gas injection means opposed to the back surface of the workpiece are provided, wherein a nozzle hole of each gas injection means is inclined obliquely downward
Data Source
AI summary
A drying apparatus of the present invention includes a drying tank for performing drying processing of a workpiece, a fixture for the workpiece, heating means opposed to a front surface of the workpiece, and heating means opposed to a back surface of the workpiece, wherein each heating means is inclined from a horizontal line in its longitudinal direction.