What are the reasons for the unevenness of the screen printing mesh photosensitive layer?

Using screen printing mesh printing process often causes uneven photosensitive layer. The main reasons are the following:

1. The pressure of the scraper must also be appropriate. If the pressure applied by the scraper to the screen is uneven during the scraping stroke, holding the scraper with only one hand will often cause a problem. The glue applicator is operated with two hands and clamps the net frame on the fixed installation. Mingde silk screen factory reminds you: the glue scraping strength must be uniform

2. The tension of the screen printing mesh is very important for proper photoresist coating. If the screen tension is too small, the screen is too loose, and the pressure of the applicator on the screen edge is greater than the screen center, which will cause The photosensitive coating at the center of the screen is thicker, while the coating at the edges of the screen is thinner. Mingde silk screen prompts you: the screen tension should be well controlled.

3. If the size of the scraper relative to the screen frame is too long, the two sections of the scraper walk on the edge of the screen frame. This will reduce the pressure of the scraper and produce an uneven coating. Generally speaking, The length should be 5-10cm less than the size of the coated screen. Mingde screen printing reminds you: Use the size of the doctor.

Accuracy of screen printing mesh frame dimension accuracy: ± 0.3mm shape tolerance ± 0.3mm, normal running negative tolerance. Adhesive thickness range: 0.05 ~ 0.17mm; 0.05 / 0.1 / 0.13 / 0.15 / 0.17mm. Minimum line width: 0.2mm printed line width should be greater than 0.2mm as much as possible, and the minimum should not be less than 0.2mm. Minimum gap: 0.3mm printing gap should be greater than 0.3mm as much as possible, and the minimum should not be less than 0.3mm

Hebei Maishi Screen Printing Co., Ltd. has large-scale screen printing mesh equipment (compared to a large area of ??2.8m * 5.8) with strong screen plate making capabilities and perfect technology, which meets your production needs to a large extent.

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