Material suitability
The choice of printing plate: There are many kinds of printing plate, can depend on:
Plate is divided into aluminum, zinc, stone, resin, nylon, cardboard, glass.
Structure is divided into single, double, multi-layer.
The plate-making method consists of manual, transcription, optics, and electronics.
The layout is divided into plano-convex, plane, and plano-concave.
Grinding methods include ball mill, brush mill, chemical mill, electro chemical mill, and sand blast mill.
The layout is divided into chemical and anode.
Film coating methods are self-coated, machine-coated, and pre-coated.
The coated surface of the optical film is divided into single-sided and double-sided.
Shaiban tablets are divided into positive and negative types.
Film processing methods are divided into film type, sub-film type.
Printers are divided into proofing machines, express machines, pagers, rotary machines and transaction printers.
Seen from the above, there are many types. In fact, at present, many printing plates used in Taiwan's lithographic printing plants are pre-coated and positive-type ones, or simply PS plates. The quality of printing using this type of printing plate is quite high, and the plate making procedure is simple, as long as it is automatically processed in the plate processor, it can be completed in a few minutes. There are still a few family-owned printing houses that use zinc or aluminum plates to make a small version of a protein plate.
The choice of paper: There are three kinds of choices, quality and weight. In terms of types, there are printing papers: bond paper, printing paper, magazine paper, newsprint paper, molded paper, coated paper, bible paper, and doline paper.
Writing paper: book paper, letter paper, miscellaneous paper, typing paper, card paper, drawing paper.
Drawing paper: watercolor paper, special paper, ordinary paper, charcoal paper, sea drawings.
Packaging paper: kraft paper, sulfite paper, match paper, anti-rust paper, cigarette paper, fruit paper, sulfuric acid paper, cellophane paper, wax paper.
Filter paper: chemical analysis paper, insulation paper.
Absorb paper: blotting paper, carbon paper, napkins, toilet paper.
Special processing paper: back carbon paper, photosensitive paper, fiber paper.
Cardboard categories: yellow cardboard, white paperboard, coreboard, corrugated cardboard, ticket paperboard, construction cardboard, and Other eight categories.
Seeing that there are so many types above, it's not hard to know how to make a choice for a time. It is not difficult to do so, because the most commonly used are the first type of wood forest paper, molded paper and coated paper. In terms of quality choice, Daolin Paper has all-wood forests, ivory road forests, Baidao forests, and color road forest paper. Mold paper has white mold, beige mold and color mold papermaking. Coated paper has a mirror copper plate, super light double copper, super double copper, double-sided copper plate, single-sided copper plate, snow plate copper plate and coated copper plate paper and so on. There are also the choices of printing paper, magazine paper, scheduling paper, and advanced scheduling paper. In fact, there are only a few of them.
In addition, the weight of paper, there are two commonly used methods of weight: one for the basis weight, more common in the international market, is a one-meter square of paper, weight on the electronic balance, in grams, That is, gsm, or "mipping amount."
One is heavy, and the weight of a 500-sheet scale is pounds/order. Both are used at home and abroad, but for the sake of convenience, it is easier to use the basis weight, so that papers with the same thickness do not differ in the 31x43" pounds and the 25x35" pounds.
The basis weight of most papers is from 60 to 100 GSM, that of coated paper is from 80 to 190 GSM, and that of molded paper is as low as 45 gsm. Just before use, you must first understand the purpose, purpose, function, and characteristics so that the best choice can be made. It is not difficult. In addition, paper and humidity are closely related. First of all, we must know that paper is a pulp consisting of 99% moisture, 0.5 to 1% cellulose, fillers and gums, referred to as pulp. The pulp is then fed to a papermaking machine. The hopper funnels the pulp cloth on the moving screen to filter out most of the water, and then presses the hot rollers to squeeze out the excess water and dry it to make the paper. After the above brief description, we can know that the paper has "mesh and non-mesh" points, with a thick mesh surface and a non-mesh surface. At the same time, there will be a "silk flow", that is, the arrangement of fibers in the direction of the strip. This directly affects the paper and causes the phenomenon of bending after being damped. This has a lot to do with bookbinding. If the flow of paper follows the long edge, the edge of the book is straight, otherwise it is very easy to bend.
Choice of ink: Lithographic printing inks are mostly transparent four-color inks. There are not many choices for color printing. At most, gold and silver are added. In contrast, there are more choices in color printing, and in special printing, there will be a variety of choices for certain special requirements, such as: fluorescent ink, pearl ink, black desensitization, magnetic ink, and ultraviolet ink. There is also a distinction between transparent and opaque ink. Nowadays, many large printing plants use four-primary transparent ink in large barrels. The automatic transfer pipe for high pressure pumping is used to send the ink directly to the printing press. The staff will not be too troublesome and do not need to transfer ink. This work has become very It's easy.
(to be continued)