Crystal refers to natural quartz crystal. The pure crystal is very beautiful, with a hexagonal columnar crystal, clean and colorless, shining and shiny, and can refract colorful colors under the sunlight. If there are impurities, it will have a color, such as the famous citrine, amethyst, etc. However, there are not many natural large crystals, which are generally artificial. When colorless quartz is heated to 2000 ° C, it forms a transparent single crystal, and various advanced crafts and lenses are made by cutting and grinding. Although crystal products are used High temperature resistance, wear resistance, not easy to be corroded by acid and alkali, but its cost is high and the processing efficiency is low. The "crystal crafts" in real life are processed with plastic products such as organic glass and transparent resin crystal glue. These imitation crystals Plastic has good transparency, looks like crystal, is easy to process and manufacture, raw materials are easy to buy, and the price is cheap. It can be produced in large quantities by machinery or hand-made at home.

Now this kind of crystal technology is used in conference souvenirs, corporate promotional materials, craft gifts, tourist souvenirs, decorative items, etc. Crystal crafts have their unique ornamental and collectivity, and the application of screen printing technology in crystal crafts , Not only to improve its craft decoration and ornamental, but most enterprises and institutions have printed relevant public relations text and patterns on handicrafts, so that they can unconsciously play the role of image publicity when viewed by people, and increase the visibility of the enterprise.

The following briefly introduces its technological process and corresponding production methods. The technological process is: two steps of mold-casting. The function of the mold is to make the processed raw materials easy to form and facilitate mass production. Although the ratio of various crystal compounds is different, the production process is consistent. Formula (calculated by mass ratio): 100 parts of plexiglass monomer (polymethyl methacrylate liquid), plexiglass plate (molded 3 to 5 mm thick) <6 parts, 4 to 6 parts of dibutyl phthalate solution, Azobisisobutyronitrile white crystals (toxic, please pay attention to safety during operation, wear protective gloves and supplies) 0 to 1 part.

The mold is generally made of a flat glass plate, such as various simple square and round molds. You can use a glass knife to cut the silicon glass (flat glass) into the desired geometry and the edge of the wall, and then use glass glue to glue the edge to the bottom plate On the glass, the glass glue should stick to the outside of the mold when bonding. If the edge of the edge is not flat, use a grinding wheel to smooth it. If you need to make high-precision crafts, you need to use silicone rubber or metal to make a three-dimensional mold. The smoothness in the mold is proportional to the surface finish of the product after molding.

Operation method: First put the plexiglass monomer in the enamel container, dissolve the plexiglass plate in the monomer according to the mixing ratio and stir evenly, then add dibutyl phthalate and azobisisobutyronitrile, and stir to mix well. After eliminating the bubbles generated during stirring, the adjusted slurry is poured into the model for polymerization. After the mold is opened, the finished transparent plexiglass is obtained. If you want to make the transparent product slightly colored, you can add a small amount of organic to the ingredients Pigment, after mixing, the product will get colorful effect. If you want to make all kinds of imitation amber crafts with molds, you should pre-select the various small models, biological specimens, coins, toys, etc. (referred to as molds) after a half of slurry injection, and park them in the middle of the mold. Fill the mold cavity again. It can also be put into the mold first and then cast at one time.

In the process of screen printing and decoration, you should choose 300 ～ 420 mesh nylon color screen, oblique stretch screen directly to make screen, the film should not be too thick, use a variety of plastic ink printing, can be printed on the surface of the finished product It can also be printed in handicrafts. The specific method is to polymerize half of the infused paste, take it out, place it on the positioning module of the handprint table, and print the graphics by manual printing. The ink used should be compared with the paste. To see if they dissolve and react with each other, use non-reactive ink to print, and the decorative layer outside the mold should also be tested to avoid damaging product quality. After printing and drying, put the semi-finished product into the mold to fill and seal, then the picture and text are sealed in the middle of the handicraft. For curved surface and curved surface printing, transparent self-adhesive printing can be used first, pasted after refilling; when bronzing graphics and graphics are required, in addition to using a bronzing machine, gold imitation bronzing graphics can also be used to print imitation bronzing graphics and texts, using beige Ink or imitation etching ink for negative printing, that is, highlighting the imitation of the text pattern imitation bronzing, this method is also suitable for the printing of various handicraft surfaces or trademarks, the required ink color is similar to the background color.

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