Analysis of Material Adaptability for Green Bag Printing

- Mar 28, 2018-

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 quite a few types. In fact, at present, many printing plates used by Taiwan's lithographic printing plants are pre-coated and positive ones, and are referred to as PS plates for short. 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. Total in terms of species

Printing papers: bond paper, printing paper, magazine paper, newsprint paper, mold 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 cardboard, building paperboard and other eight categories.

See there are so many kinds of the above, a time really do not know how to make the selection, it is not difficult, mostly because the most commonly used first class wood-free paper, wood-free paper and coated paper three. In terms of quality choice, Daolin Paper has all-wood forests, ivory road forests, Bai Daolin, 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 textured paper and many other. There are also the choices of printing paper, magazine paper, scheduling papers, and advanced scheduling papers. 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 scale, in grams, That is, gsm, or "mipping amount." One is heavy, and the weight of a 500-paper 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 to save the same thickness of paper at 31x43" pounds and 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. Before use, it is only necessary to understand the purpose, purpose, function, and characteristics so that the best choice can be achieved. It is not difficult. In addition, paper and humidity are closely related. First, we need to know, based paper containing 99% water, 0.5 to 1% cellulose gum filler and consisting of a slurry, referred to as pulp, this pulp is then sent to the paper machine, the elongated The funnel removes most of the water from the pulp screen on the moving screen, and then presses the hot rollers to squeeze out the excess moisture and dry it to make the paper. After the above brief description, we can know that paper is divided into "mesh and non-mesh", with a thicker mesh and a flatter non-mesh. At the same time, there will also 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 colors are added. Instead selective in chromatic printing more, when another special printing is required for a particular variety of options, such as: fluorescent ink, pearl ink, desensitization black magnetic ink, UV ink or the like. 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 bothered or need to adjust the ink. This work has become very It's easy.