Photosensitive adhesives for screen printing include dichromate-based emulsions, diazonium-based emulsions, and single-liquid emulsions. Diazo-based photoresists are generally composed of diazo-resin, vinyl acetate and polyvinyl alcohol. Prepared, also weighed nitrogen sensitive adhesive, is commonly used screen printing plate material.
Diazo photosensitive adhesives can be divided into solvent-resistant and water-resistant two major categories, this article will be Star Series diazo photosensitive adhesive as an example, describes the use of diazo photosensitive adhesive.
Solvent-resistant photosensitive adhesives are suitable for solvent-based inks. They are mainly used for screen printing of advertising signs, ceramic decals, plastics, glass, and metal products. Water-resistant photosensitive adhesives are suitable for printing and dyeing, fabric printing, and T-shirt color dot printing, etc. Water-based ink, screen printing of aqueous slurry. The process flow of plate making is as follows: stretching net → cleaning → drying → coating photosensitive resin → drying → exposure → developing → drying → correction → curing treatment → printing.
1, stretch net and cleaning
First of all, according to the printing requirements to select the appropriate frame and screen, through mechanical or manual stretching, and then to clean the frame, usually use a special cleaning agent or neutral, weak alkaline detergent repeatedly wipe, if necessary, can be Grind with a gauze paste and rinse with water before use.
2, preparation of photosensitive adhesive
The proportion of the diazo photosensitive adhesive: colloidal 1000g + diazonium photosensitizer 8 ~ 10g + water 50 ~ 100ml. Pour the photosensitizer powder 8~10g in 50~100ml water; pour the dissolved photosensitizer into 1000g colloid and mix well; defoam for 30~60 minutes and let it stand for 2~3 hours before use. The amount of water to be used depends on the viscosity of the coating colloid; the photosensitizer powder must be completely dissolved and then poured into the colloid; clockwise when stirring, so as to avoid air bubbles;
Photosensitive adhesives have a shelf life of 1 year before they are used. The optimal period for use after preparation is 15 days or so, and they can be stored at a low temperature for 2 months or longer.
3, coating photosensitive adhesive
Dissolve the defoaming photosensitive adhesive directly into the sizing device, and pour it into more than half of the volume of the sizing device. Fix the cleaned frame on the bracket to an angle of 80±5° from the horizontal plane. The sizing device and the screen The surface is formed into an angle of 75°, and the coating is uniformly applied from the bottom to the top. The printing surface is applied first, and then the squeegee is coated. Generally, the screen is switched up and down 4 times, and then placed in an oven to dry. Remember that each coating is applied. The online version must be dry. In addition, the number of coating should be increased according to the printing requirements to control the thickness of the adhesive layer.
4, drying
Drying temperature is the most suitable at 40°C. Conditional ovens and other optional equipment can be used. Hair dryers, electric fans and other simple tools can be used unconditionally, but they must work in a dust-free environment to avoid affecting the quality of the screen.
5, exposure
The photosensitizing wavelength of the diazo series is 330-430nm, and iodine lamps, ultra-high pressure mercury lamps and other similar light sources are available.
Exposure is best to use professional stencil machine, film and photographic film should be squeezed and squeezed; unconditional sandbags can be used to prevent light refraction, affecting the quality of printing.
6, development
After exposure, the screen should be soaked in water for about 2 minutes, then rinsed with a spray gun or pressurized tap water until the pattern is clear, and then dried with hot air at 40°C or allowed to air dry.
7, revision
The dried screen plate is repaired with a sealer, and the adhesive layer should not be too thick.
8, curing
If you want to improve the screen printing resistance, you can double-exposure the screen after the repair, and then apply external curing agent for curing. The method of using the external curing agent is to use a sponge to dip the outer curing liquid to paint the front and back surfaces of the adhesive film. After the brushing is uniform, the resist is baked in an oven at 40° C. for 10 to 20 minutes, and then the machine can be printed. In addition, there is an external curing agent that does not need to be baked. Its use method is the same as above, but it can be printed without baking and drying.
Diazo photosensitive adhesives can be divided into solvent-resistant and water-resistant two major categories, this article will be Star Series diazo photosensitive adhesive as an example, describes the use of diazo photosensitive adhesive.
Solvent-resistant photosensitive adhesives are suitable for solvent-based inks. They are mainly used for screen printing of advertising signs, ceramic decals, plastics, glass, and metal products. Water-resistant photosensitive adhesives are suitable for printing and dyeing, fabric printing, and T-shirt color dot printing, etc. Water-based ink, screen printing of aqueous slurry. The process flow of plate making is as follows: stretching net → cleaning → drying → coating photosensitive resin → drying → exposure → developing → drying → correction → curing treatment → printing.
1, stretch net and cleaning
First of all, according to the printing requirements to select the appropriate frame and screen, through mechanical or manual stretching, and then to clean the frame, usually use a special cleaning agent or neutral, weak alkaline detergent repeatedly wipe, if necessary, can be Grind with a gauze paste and rinse with water before use.
2, preparation of photosensitive adhesive
The proportion of the diazo photosensitive adhesive: colloidal 1000g + diazonium photosensitizer 8 ~ 10g + water 50 ~ 100ml. Pour the photosensitizer powder 8~10g in 50~100ml water; pour the dissolved photosensitizer into 1000g colloid and mix well; defoam for 30~60 minutes and let it stand for 2~3 hours before use. The amount of water to be used depends on the viscosity of the coating colloid; the photosensitizer powder must be completely dissolved and then poured into the colloid; clockwise when stirring, so as to avoid air bubbles;
Photosensitive adhesives have a shelf life of 1 year before they are used. The optimal period for use after preparation is 15 days or so, and they can be stored at a low temperature for 2 months or longer.
3, coating photosensitive adhesive
Dissolve the defoaming photosensitive adhesive directly into the sizing device, and pour it into more than half of the volume of the sizing device. Fix the cleaned frame on the bracket to an angle of 80±5° from the horizontal plane. The sizing device and the screen The surface is formed into an angle of 75°, and the coating is uniformly applied from the bottom to the top. The printing surface is applied first, and then the squeegee is coated. Generally, the screen is switched up and down 4 times, and then placed in an oven to dry. Remember that each coating is applied. The online version must be dry. In addition, the number of coating should be increased according to the printing requirements to control the thickness of the adhesive layer.
4, drying
Drying temperature is the most suitable at 40°C. Conditional ovens and other optional equipment can be used. Hair dryers, electric fans and other simple tools can be used unconditionally, but they must work in a dust-free environment to avoid affecting the quality of the screen.
5, exposure
The photosensitizing wavelength of the diazo series is 330-430nm, and iodine lamps, ultra-high pressure mercury lamps and other similar light sources are available.
Exposure is best to use professional stencil machine, film and photographic film should be squeezed and squeezed; unconditional sandbags can be used to prevent light refraction, affecting the quality of printing.
6, development
After exposure, the screen should be soaked in water for about 2 minutes, then rinsed with a spray gun or pressurized tap water until the pattern is clear, and then dried with hot air at 40°C or allowed to air dry.
7, revision
The dried screen plate is repaired with a sealer, and the adhesive layer should not be too thick.
8, curing
If you want to improve the screen printing resistance, you can double-exposure the screen after the repair, and then apply external curing agent for curing. The method of using the external curing agent is to use a sponge to dip the outer curing liquid to paint the front and back surfaces of the adhesive film. After the brushing is uniform, the resist is baked in an oven at 40° C. for 10 to 20 minutes, and then the machine can be printed. In addition, there is an external curing agent that does not need to be baked. Its use method is the same as above, but it can be printed without baking and drying.
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