Insufficient circuit precision is a prominent issue during heating plate etching. The width and spacing of etched circuits deviate from design specifications, with uneven edges, serrations and burrs appearing. This not only impairs heat uniformity of heating plates, but also may cause local overheating, degrade product performance and reliability, and even trigger potential safety hazards.
Cause Analysis
Equipment precision defects
Low accuracy of positioning and motion control systems leads to displacement of the etching head, failing to carve patterns as designed. Errors of grating rulers or encoders result in inaccurate position feedback and circuit offset.
Mask fabrication flaws
As a core component, mask quality directly determines circuit precision. Dimensional errors and pattern distortion of masks will be transferred to finished heating plates. Uneven mask thickness also causes inconsistent etching depth and poor circuit quality.
Improper etching process parameters
Concentration, temperature, flow rate of etching solution and etching time greatly affect processing results. Abnormal solution concentration leads to uncontrollable etching speed and circuit width. Unstable temperature fluctuates chemical reaction activity and causes uneven etching. Uneven liquid supply generates edge burrs and serrations. Excessive etching time causes over-etching, while insufficient time results in incomplete etching.
Solutions
- Conduct regular equipment maintenance and calibration. Inspect and adjust positioning and motion control components, and replace worn parts to guarantee operational accuracy.
- Strengthen mask quality control. Adopt high-precision photolithography to ensure dimensional and shape accuracy. Carry out strict inspection and eliminate unqualified masks.
- Optimize process parameters. Confirm optimal parameter combinations through experiments and maintain stable production conditions. Apply online monitoring devices to adjust solution status in real time, and set proper etching time according to material and thickness of heating plates.