[Screen Printer] Core process of mobile phone cover screen printing

Mobile Phone Cover Silk Screen Printing Process

Mobile phone cover silk screen printing is a surface decoration process. Its core workflow is as follows (processes vary slightly for different types of covers):

1. Pre-Printing Preparation

- **Surface Cleaning**: Glass or composite materials must be thoroughly cleaned to remove impurities, usually via ultrasonic cleaning to ensure ink adhesion.

- **Plate Making & Positioning**: Output the designed pattern to a film negative, and transfer the graphics/text to the silk screen plate through photographic plate making; fix the cover on the printing table, and use a precision alignment system to calibrate the fit between the screen and the cover. 

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2. Printing Process

- **Ink Coating**: Use a squeegee to evenly scrape ink at a pressure of 0.2–0.5 MPa, allowing ink to transfer to the cover surface through screen mesh. PTFE sheets can recycle excess ink to reduce costs. 

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- **Curing Treatment**:

  - UV ink: Rapid hardening via UV irradiation for 10–30 seconds;

  - Non-UV ink: Drying via oven heating at 150–200℃.

3. Post-Processing & Quality Inspection

- **Cleaning & Trimming**: Remove ink overflow at the edges and check pattern integrity.

- **Adhesion Test**: Verify ink firmness using cross-cut test or abrasion test. 

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4. Process Differences for Special Covers

- **3D Glass Cover**: Silk screen printing is performed after hot bending forming, with high difficulty in curved surface fitting.

- **Composite Material Cover**: First conduct UV transfer texturing, then silk screen the LOGO, and finally shape via high-pressure forming.

Key Control Points

- **Screen Plate Precision**: A high-mesh-count screen improves pattern clarity, and ink transmittance must be balanced.

- **Environmental Requirements**: Operate in a clean room to reduce printing defects.

- **Process Coordination**: Require precise coordination with processes such as hot bending and coating.