Manual Screen Printing Technology (3)

Third, the printability

Lak's paint film can use thick paint, coatings, dyes, pigments, and leathers as printing materials, and can be used for the printing of substrates such as paint, linoleum, cloth, paper, and glass.

Gelatin paper-engraving and nitrocellulose-lacquer paper-engraving plates and photosensitive-printing plate-making plates can also be used with solvent-based pigments, such as plastic inks, in addition to the full suitability of lacquer paper lithographs. Vinyl chloride, polyvinyl chloride, etc. for printing materials, suitable for printing plastic products, leather and other substrates.

Printing material properties and preparation

Handprinting covers a wide range of areas. Different substrates have different choices for printing materials. According to the printing of common substrates, the preparation methods of several printing materials are introduced.

First, the performance of plastic printing materials and preparation

(I) Drug properties 1. PVC: The main raw material of powdered resin plastic formula, drying quickly and easily expandable, easy to form a gel, non-gloss, when dissolved in cyclohexanone need to be heated.
2. PVC: Imported paste-like resin has better transparency than powder. It can be dissolved in cyclohexanone without heating, and it has the same function and powdery resin when used.
3. Perchloroethylene: The main raw material of flocculent resin plastics, the drying time is slower than polyvinyl chloride, sticky and shiny, but it is heavier than polyvinyl chloride resin after drying, and should not be added in the formula, otherwise there is adhesion phenomenon after drying. .
4. Perchloroethylene varnish varnish is used for mixing varnish in vain water. Compared with lacquer, it can be dried quickly. It can not only play a solid role in printing paint but also can play a role in drying.
5, cyclohexanone solvent, used to dissolve polyvinyl chloride resin and vinyl chloride resin, corrosive, dry and slow, if the amount of over the Ambassador poly (vinyl chloride) resin dissolved, it is best to stop the use of acetate Ester or xylene.
6, butyl acetate (ethyl) ester solvent, in the formula from the dilution effect, the ethyl ester is faster than the butyl ester, two kinds are shiny, the general formula commonly used butyl ester.
7, xylene solvent, dilute use, high corrosive and volatile, dry, large, put more in the seasoning can accelerate drying, but the deployment of gold or silver can not be used.
8, dibutyl phthalate solvent, play a plasticizing role in the formula, dry slowly, not suitable for use in the ingredients.
9, nitrobenzene solvent, flammable, toxic, low volatility, can play a slow-drying effect, a good allocation of plastic raw materials to add a little, when printing can prevent the seal, the seal can be used to solve the version.
10, colored printing coating (pulp) material weight, weight, moisture is also large, adjust plastic printing material is not easy to put more, easy to put more caking, printing from the honeycomb.

(B) Ink preparation

1. Formulation of polyvinyl chloride slurry PVC tree means 100 grams of cyclohexanone 500 grams of xylene 500 grams of dibutyl phthalate 100 grams of operation The medicine is poured into the seasoning vessel in order, each time it is poured into a medicine Stir the glass rod or stick thoroughly to allow it to dissolve completely.
When the ingredients are adjusted, the seasoning utensils need to be placed in warm water in isolation to promote the dissolution of the medicine.
Note: The adjusted polyvinyl chloride slurry is transparent, and it is easy to form a jelly in cold weather. When used together with other ingredients in winter, it needs to be heated and allowed to melt.

2. Preparation of Perchlorethylene Paste Formula CPE resin 500 g Cyclohexanone 500 g Dimethyl stupid 500 g Butyl acetate 500 g Operation Pour the medicines into the seasoning vessel in order. Each pour into a medicine requires a glass rod or The stick is fully stirred so that it dissolves completely.
The preparation of this material does not need to be heated, and the prepared PVC paste is in a brownish transparent state.

3. Preparation of White Material PVC Paste 500g Perchlorethylene Paste 500g Titanium Dioxide (Titanium Dioxide) 500g Operation Put the above medicines in the iron bucket, stir it with a wooden stick, and stir it with a mixer. 6 More than an hour, the medicine will be stirred thoroughly evenly and delicately, and a little blue paint will be added. The advantage of this is that the tuned white material is bright and vivid.
After filtering with a sieve of about 100 mesh, it is placed in a porcelain jar, covered and stored, and a small amount of cyclohexanone is covered on the surface to prevent drying.

4, gold (silver) pigment preparation formula PVC slurry 120 g perchloric chloride 80 grams of gold (silver) powder (above 800 mesh) 100 grams of operating gold (silver) powder before mixing with cyclohexin soaking for a period of time .
The medicine was poured on the glass plate in order and mixed with ink scoops.
Gold (silver) material is used with the tone, and should not be stored for too long, so as to avoid too long gloss and darkness, which will affect the effect after printing.
The gold (silver) material is thick or dry and may be diluted with cyclohexanone, but xylene cannot be added or added, otherwise it may cause gold to fall.

5, dark material preparation formula vinyl chloride slurry 30 grams of polyvinyl chloride slurry 70 grams of printing paste appropriate amount of operation on the saucer with ink shovel according to the original color sample deployment, but the color is slightly shallower than the original, printing and drying before and The color of the original is the same.

6. Formulation of light color materials Formulation of white material Appropriate amount of printing paste Operation The color palette of the printing paste is used to prepare the original color sample on the color palette, but the color is slightly deeper than the original, and the color of the original can be consistent after the printing is dry.

(3) Common Formula Reference

1. Co-formulation formula prepared with vinyl chloride: vinylidene chloride-chloroethylene co-coating resin 200 g cyclohexanone 500 g butyl acetate 400 g operation In order to pour the medicines into the sauces, pour a medicine glass rod or The wood stick is fully stirred so that it is completely dissolved and added to the pigment.

2. Co-grain preparation formula Vinyl chloride-vinyl acetate co-big resin 150 g Butyl acetate 400 g Cyclohexanone 500 g Methyl benzoate 200 g Operation Dispensing the medicines in a saucer order, each poured into a medicine The glass rod or stick is fully stirred so that it can be completely dissolved and added to the pigment.

The above two formulas are simple to operate, do not need to be heated and dissolved, and do not need to be mixed. Single use, glossiness and firmness are ideal, but they should be used flexibly according to climate change and raw material properties.