Manual screen printing involves a wide range, different substrates have different choices of printing materials. According to the printing of common substrates, several preparation methods of printing materials are introduced.
1. Performance and preparation of plastic printing materials
(1) Drug performance
1. Polyvinyl chloride: powdered resin
The main raw material of the plastic formula is fast drying, easy to expand, easy to form a gel, dull, and needs to be heated when dissolved in cyclo ethyl ketone.
2. Polyvinyl chloride: paste resin
Imported goods, the transparency is better than powder, it can be dissolved in cycloethyl ketone without heating, and it has the same function as powder resin when used.
3. Perchloroethylene: flocculent resin
The main raw material of plastics, drying time is slower than that of polyvinyl chloride, it is sticky and shiny, but it is more viscous than polyvinyl chloride resin after drying, and it should not be added in the formula, otherwise there will be adhesion after drying.
4. Perchloroethylene varnish
The varnish is used as a mixed varnish in Fanli water. Compared with lacquer, it dries faster. It can not only stabilize but also dry in lacquer pigments.
5. Cyclohexanone
Solvent, used to dissolve polyvinyl chloride resin and perchloroethylene resin. It is corrosive and slow to dry. If the amount of poly (vinyl chloride) resin dissolved is too large, it is better to stop using it and switch to butyl acetate or xylene.
6. Butyl (ethyl) acetate
Solvent, which acts as a diluent in the formulation. Ethyl ester dries faster than butyl ester. Both are shiny. Butyl ester is commonly used in general formulations.
7. Xylene
Solvent, for dilution, high corrosiveness and volatility, great dryness, put more in the seasoning to accelerate drying, but it cannot be used when mixing gold or silver.
8. Dibutyl phthalate
The solvent plays a plasticizing role in the formulation, drying slowly, and should not be used more in the ingredients.
9. Nitrobenzene
Solvent, flammable and toxic, low volatility, can play a slow-drying role, add a little to the prepared plastic raw materials, it can prevent the seal during printing, and the seal can be used to solve the version.
10. Various color printing coating (paste) materials
The powder is heavy and the moisture is large. It is not easy to put more when adjusting plastic printing materials, and it is easy to agglomerate.
(2) Preparation of printing materials
1. Preparation of PVC slurry
formula
PVC tree finger 100g
Cyclohexanone 500g
500g xylene
100 g of dibutyl phthalate
operating
Pour the medicines into the condiment containers in sequence, and stir each glass with a glass or wooden stick to dissolve it.
When preparing the ingredients, the seasoning utensils should be placed in hot water and heated to promote the dissolution of medicines.
Note: The adjusted PVC slurry is transparent, and it is easy to form a jelly in cold weather. When it is used with other ingredients in winter, it needs to be heated in water to dissolve it.
2. Preparation of PVC slurry
formula
500g of perchloroethylene resin
Cyclohexanone 500g
500g
500 g of butyl acetate
operating
Pour the medicines into the condiment containers in sequence, and every time a medicine is poured, it needs to be fully stirred with a glass rod or wooden stick to completely dissolve it.
There is no need to heat when preparing this material, and the prepared PVC slurry is brownish red and transparent.
3. Preparation of white materials
formula
Polyvinyl chloride pulp 500g
500g perchlorinated pulp
Titanium dioxide (titanium dioxide) 500g
operating
Pour the above medicinal materials into the seasoning iron bucket, stir with a wooden stick, and then stir with a blender for more than 6 hours. Stir the medicinal materials evenly and finely, and add a little royal blue paint. The white material has bright colors.
After filtering with a sieve of about 100 mesh, put it in a porcelain jar with a lid and store it, and pour a little cyclohexanone on the surface to cover the surface to prevent drying.
4. Preparation of gold (silver) color material
formula
120g of PVC paste
Perchlor vinyl paste 80g
Gold (silver) powder (above 800 mesh) 100g
operating
The gold (silver) powder needs to be soaked with cyclohexanone for a period of time before being mixed.
Pour the medicines on the glass plate in sequence and mix with the ink shovel.
The gold (silver) material should be used as it is adjusted, so it should not be stored for too long, otherwise the gloss will be darkened and the effect after printing will be affected.
The gold (silver) material is thick or dry too fast, it can be diluted with cyclohexanone, but xylene cannot be added, otherwise it will easily cause gold loss.
5. Preparation of dark materials
formula
Perchlorethylene pulp 30g
Polyvinyl chloride pulp 70g
The right amount of printing paste
operating
Use an ink shovel on the spice board to match the original color sample, but the color is slightly lighter than the original. After printing and drying, it can be consistent with the original color.
6. Preparation of light color materials
formula
The right amount of white material
The right amount of printing paste
operating
Use an ink shovel on the palette to match the original color sample, but the color is a little darker than the original, and the color of the original can be consistent after the printing is dry.
(3) Common formula reference
1. Co-coating slurry preparation
formula
Vinylidene chloride-vinyl chloride coating resin 200g
Cyclohexanone 500g
Butyl acetate 400g
operating
Pour the medicines into the condiment containers in sequence. After each kind of medicine is poured, use a glass rod or wooden stick to stir it thoroughly to dissolve it and add the pigment to use.
2. Preparation of total giant slurry
formula
150g of vinyl chloride-vinyl acetate co-resin
400 g butyl acetate
Cyclohexanone 500g
Methyl benzoate 200g
operating
Pour the medicines into the condiment containers in sequence. After each kind of medicine is poured, use a glass rod or wooden stick to stir it thoroughly to dissolve it and add the pigment to use.
The above two formulas are easy to operate, do not need to be heated and dissolved, do not need to be mixed, single use, gloss and firmness are ideal, but according to climate change and raw material performance, flexible use of the master. [next]
2. Performance and preparation of printing materials for paint and thick paint
(1) Drug performance
1. Various thick paints
The main material of printed varnished cloth and lacquered paper is heavy powder, less sticky than ink, shiny, easy to dry, and has a three-dimensional impression on the surface of the object.
2. Various resin inks
Viscous, shiny, and not easy to dry.
3. Dry oil
Promote the drying of thick paints and inks, quantified by the climate, add more when cold and less when hot.
4. Grease varnish (formerly known as Fan Lishui) has luster, good viscosity and is used for dilution.
5. Turpentine
It is used for dilution, low volatility, good decomposing power, dull, and is a good solvent for thick paint.
6. Glycerin
Colorless and odorless viscous liquid.
7. Gasoline
For dilution, high volatility, non-sticky, not too much when used.
8. Fish oil
Glossy, not easy to dry, a little sticky, can be used more when adjusting gold powder.
B) Printing material preparation
1. White paint preparation
formula
Lide powder 15 kg
Grease varnish 8 kg
1 kg of glycerin
operating
When blending, press with an inking machine several times.
2. Black paint preparation
formula
Carbon black 15 kg
Grease varnish 12 kg
1 kg of glycerin
Black ink 1.5 kg
operating
When blending, press with an inking machine several times.
3. Red paint preparation
formula
Toluidine Red 3.5 kg
Fatty varnish 6 kg
1 kg of glycerin
1 kg red ink
operating
When blending, press with an inking machine several times.
4. Preparation of various thick paint materials
formula
Thick paint 60-80
Printing ink 40-20
Dry oil 1-15
Thinner amount
operating
According to the original color sample, use an ink shovel to make adjustments on the ink table. The dark color is lighter than the original, and the light color is darker than the original. [next]
3. Preparation and operation of cotton textile printing materials
(1) Preparation and operation of cooked pulp
1000 grams of wheat starch, adjusted to a uniform paste with cold water, heated and boiled for a few minutes, after the pulp is cooked through, then add warm water to flush to 5000 grams for use.
(2) Preparation and operation of printing materials
Powdered fast pigment 150-300g
Neutral Swire Oil 150-250g
Caustic soda (40 ° Be) 100-150 g
150-250 grams of industrial alcohol
Cooked pulp (wheat starch) 3000-2750 g
Cooked water (50-70 ℃) 1450-1300 g
Weigh the dye first, then add neutral Swire oil, caustic soda (if Swire oil is acidic, you should first burn the lye and then Swire oil), industrial alcohol, mix it into a slurry, and pour into 50-70 ℃ hot water Stir thoroughly until the dye is completely dissolved, and finally add the dye solution to the already weighed paste under stirring, and blend it evenly to produce cotton textile printing material.
(3) Preparation and operation of color-developing acid
Pour 100g of 66 ° Be concentrated sulfuric acid and 150g of Yuanming powder (also known as anhydrous thenardite) into 2000g of cold water, stir evenly and then heat the water to a total weight of 5000g. Note: Do not pour concentrated sulfuric acid into hot water or pour clean water into sulfuric acid, otherwise it is easy to cause the acid to burst and splash on the skin, causing corrosion and burns.
After the cotton textile is printed with flowers, expose the cotton textile to the air overnight (at least 18-24 hours), immerse it for another half minute while turning in the acid solution at 70-80 ° C, take it out and rinse it with clean water several times to make the cotton No acid is left on the textiles.
(4) Preparation and operation of soap boiling liquid
5000g clean water
Soap 15g
Put the color-developed cotton textiles into boiling soapy liquid for simmering. After 10 minutes, take them out and wash them with water. The printed color of the cotton textiles is bright and firm.
Four, common light-colored formula reference
â‘ Pink: mainly white, slightly orange and peach
â‘¡ Flesh color: mainly white, slightly orange-red, medium yellow
â‘¢ Beige: mainly white, slightly orange, medium yellow and black
â‘£ Lake blue: mainly white material, slightly peacock blue, slightly deeper if you need deeper, bright blue if you need light resistance
⑤ Lake green: mainly white material, slightly bright blue, light yellow, slightly darker if necessary
â‘¥ Light snow cyan: mainly white, slightly pink and magenta
⑦Gray: mainly white material, slightly black ink, magenta, if necessary, yellow, blue, red, dark yellow, light blue, pink
⑧Emerald green: Peacock blue plus lemon yellow
⑨ Olive yellow-green: mainly white, plus light yellow and peacock blue, slightly pink
â‘©Dark green: dark yellow plus medium blue, then slightly darker red, if need to be tender, add slightly yellow, peacock blue
⑾Silver gray: mainly white material, slightly add silver paste, black ink, if you need blue, add slightly blue
â‘¿Ivory yellow: mainly white, plus medium yellow, peacock blue and orange red
â’€ Fake gold: mainly dark yellow, slightly darker red, medium blue, slightly darker black if the bottom is deeper, slightly whiter if lighter.
â’ Green lotus color: peacock blue plus pink
â’‚Bronze color: mainly dark yellow, slightly increase the red and black ink
V. Adaptability of printing materials
The prepared plastic printing material is suitable for the printing of plastic, plastic products, synthetic leather and leather substrates.
The prepared paint and thick lacquer printing materials are suitable for printing on metal plates, glass, lacquered paper, varnished cloth and paper products.
The prepared cotton textile printing material is suitable for printing on all kinds of cloth, vests, shirts and other substrates.
Manual screen printing method
During manual screen printing, hold the scraper, and apply a little pressure on the screen surface to press the printing material to the mesh of the inked part of the printing plate and squeeze it onto the substrate to make the substrate reproduce the same graphic as the original .
If you want to get the perfect screen printing, you must understand the whole process of manual screen printing. The basic steps of the screen printing process for substrates of different materials and shapes are the same, but the printing materials and printing adjustments used are slightly different. Now we will focus on the commonality.
Specifications
In-touch screen
human-machine
automatic constant tension control for unwinding,
Structure features
1. Introduce PLC
and In-touch screen human-machine interface centralized control system, with
reliable performance, easy for operation and maintenance. English/Chinese
language can be changed easily.
2. Shaft less hydraulic material loading system with chuck, hydraulic up/down
system
3. Automatic constant tension control for unwinding, EPC web guider system,
motor for material feeding with inverter
Wheel type gusset unit with motor driving.
4. Servo motors for main feeding and bag length control
Closed type automatic glue application and forming system
Paper impress, bottom folding, gluing and bag formation can be completed
automatically.
5. Side lay working table, easy operation.
Paper Bag Making Machine, Automatic Paper Bag Making Machine, Paper Bag Making Equipments
Anhui Innovo Bochen Machinery Manufacturing Co., Ltd. , https://www.innovomachines.com