Discussion on the process of coating photosensitive adhesive in silk screen printing

I. Introduction

Screen printing screen production is the first process of silk screen printing process, and it is very important to apply photosensitive rubber in screen printing screen production. The thickness of the coating, such as the thickness of the coating, and whether the force is uniform, all determine the quality of the screen printing screen. The quality of the screen printing determines the quality of the textile printing. To this end, the HTYG–S water-soluble diazo photosensitive adhesive is used as an example. The process of coating photosensitive adhesives is discussed as follows:

Second, the experimental part

2.1 Experimental supplies

A stretched screen plate (30cm*30cm); HTYG-S water-soluble diazo sensitizer and HTYG-SM diazo photosensitizer; Glue length (29cm); Brown bottle.

2.2 Photosensitive adhesive

HTYG-S type water-soluble nitrogen sensitive photoresist is formulated with HTYG-SM raw nitrogen photosensitizer before coating on the screen plate. Its formula and operation process are as follows:

HTYG-S type water-soluble diazo photosensitive emulsion: 1000g

HTYG-SM Diazo Photosensitizer: 10g

Distilled water (30~40 degrees): 50 ml

10 g of photosensitizer was dissolved in 30 ml of distilled water, the photosensitizer was fully dissolved and then filtered with a 300-mesh wire mesh, and the bottle was rinsed with the remaining 15 ml of distilled water. The merged logistics department poured the dissolved photosensitizer solution into 1,000 g of HTYG-S. In the water-soluble diazo adhesive solution, stir it evenly with a glass rod, and wait for 24 hours until it is eliminated.

Note: The soft water with good water quality can be selected without distilled water.

2.3 When coating the photosensitive adhesive, the screen frame should be placed at an angle of 85 degrees with the horizontal plane, fixed with a clip, and then the photosensitive adhesive should be poured into the adhesive applicator. The amount of glue should occupy 2/3 of the size of the adhesive applicator. The flat gluing device must be full of glue on the mouth of the gluing device, and should be close to the wire mesh. When the glue liquid is in contact with the wire mesh, the gluing device moves from bottom to top and scrapes the glue.

The positive and negative sides were evenly drawn twice. Then put it in the oven and dry it.

Note: The rectifier coating process is under yellow light.

Third, the application of photosensitive adhesive should pay attention to the problem

1. When coating the sensitized adhesive, the sizing speed should not be too slow, so as to avoid local over-thickness and uneven rubber surface.

2. Do not apply too much force when applying glue. Excessive force will make the mesh film too thin and reduce the printing strength.

To produce a high-quality screen printing plate, the application of photo-resist adhesive must be performed strictly in order to produce a high-quality screen printing plate.