Printing paper (below)

Synthetic paper refers to a thin layer of material made of polymer synthetic materials instead of plant fibers. Due to the different manufacturing methods, it can be divided into two categories: one is a thin-film synthetic paper made of polyethylene, polypropylene or polystyrene plastic film, sandblasting, chemical foaming or solvent treatment, A pigment layer is coated on the surface to make a coated paper like coated paper. The Other type is synthetic fiber paper, which is made of filaments sprayed with vinylon, nylon, polyethylene, or polypropylene, cut into fibers of appropriate length, and add binders and other auxiliary materials to make paper. Also known as non-woven fabrics. Generally not coated on the surface of the coating, the appearance of close to offset printing paper. In the first category, there are Japanese-made Q-type papers; in the second category, American Tyvek synthetic papers and the like. All-paper is isotropic, with minimal stretchability, not afraid of sun and rain, not afraid of microbial damage, good insulation, etc.; the second type of synthetic paper can also be made into tablecloths, wallpapers and clothing, in addition to printing. Can be used as filter paper, electrical insulation paper or lining cloth. Synthetic paper is suitable for printing maps, advertisements, and various outdoor posters. Since the price is more than twice as high as that of plain paper, the ink-absorbing performance is not as good as that of ordinary paper, so the current use is not universal.
Kraft paper is tough and water-resistant packaging paper, brownish yellow, very versatile, commonly used in the production of paper bags, envelopes, record sets, dossier and sandpaper. The quantitative range is 40 g/m2 to 120 g/m2. There are two kinds of webs and flat papers. There are differences between single-sided light, two-sided light, and stripes in the flatbed paper. Kraft paper is generally beaten with 100% unbleached sulphate wood pulp and long fibers in a free state, and is made on a multi-cylinder Fourdrinier paper machine. The main quality requirements are flexible and strong, high burst resistance, can withstand greater tension and pressure does not break. More than 60 grams of kraft paper sizing is greater than 0.75 mm to increase its water resistance.
The nature of the paper bag paper is similar to that of kraft paper, with a basis weight of 90 g/m2 to 100 m/m2, requiring high strength and high elongation. The sizing degree is greater than 1.75 mm and the air permeability is not less than 200 ml/min.
A white film made of calcium carbonate or other inorganic calcium salt and polyethylene resin, foaming agent and auxiliary agent. It is strongly kneaded and calendered at a temperature of 160°C. The thickness is similar to that of card paper. It can also be made into a thick cardboard. It has a certain penetration and absorption capacity for ink and can print clear pictures and texts. Appearance is close to the paper, can withstand water immersion, non-hygroscopic, non-flammable, has a high degree of bursting and tear resistance, lower production costs. It can be used for printing book cards, securities, labels, and color prints. It can also make corrugated cardboard boxes and transport foods and goods that are resistant to moisture and oil.
The important materials for binding cardboard books are white cardboard, yellow cardboard, cardboard, etc. They are mainly used to make hardcover shells and envelopes. The hardcover bookcase, which is made of cardboard, has the advantages of being sturdy, beautiful, and conducive to long-term preservation. The thickness of the binding sheets is 1.0 mm, 1.5 mm, and 2.0 mm, which requires a high degree of tightness, stiffness, elasticity, and wear resistance, as well as a low degree of flexibility and warping. The cover board made of waste paper and waste hemp should be used instead of loose, easy-to-fold, high-strength grassboard. White cardboard is used to make medium-diameter paper and sleeves. There are special cardboards that are dedicated to making various envelopes.
White paper, also known as whiteboard paper, or Manila paper, is a white, more advanced packaging board. It is used for the logo of children's educational caps and logos for stationery, cosmetics, and pharmaceuticals. It is also used for making packaging cartons. Single and double sided. The basis weight is 200 g/m2 to 400/m2. Each is divided into two grades: special grade and ordinary grade. The specification is generally 1092mm ╳ 787mm flat cardboard. Consisting of batter and slush. The batter layer is above 40 g/m2, with bleached wood pulp or reed pulp; and unbleached reed pulp, straw pulp or waste paper pulp. It was made on a multi-cylinder rotary screen paper machine. The batter is properly filled and sized, requiring a smooth, white, cardboard texture, consistent thickness, no chalking, toughness, and no breakage when folded. The water content is within 8% to 12%.
Grass cardboard, also known as yellow cardboard or horse dung paper, is a yellow packaging board. It is mainly used for the cover lining of commodity packaging, cartons and book books. There are three sub-codes, No. 1 and No. 2, with a basis weight of 200 g/m2 to 860 g/m2. Specifications are 787mm ╳ 660mm, 787mm 192mm and 787mm ╳ 546mm. The commonly used is No. 8: 420 g/m2; No. 10: 530 g/m2; No. 12: 640 g/m2. The raw material of grass board is 100% rice straw or wheat straw pulp. It is made on a multi-cylinder rotary screen paper machine. The quality is tight, the paper surface is flat, and it has certain mechanical strength and toughness. The water content is 11% to 12% (+ 2 or -3). Grass cardboard easily deformed and warped. Hardcover book covers should be manufactured using a special brown wood pulp board from 0.75mm to 3mm. It contains waste pulp and has a water content of about 12%.
Boxboard, also known as hemp board, is a kind of cardboard used to make relatively strong cardboard boxes. It is widely used for shipping books, general merchandise, radios, televisions, machine parts and foods. It is divided into No.1, No.2 and No.3. Number four, quantitative 200 g/m2, 310 g/m2, 420 g/m2 and 530 g/m2. No. 4 is commonly used as a corrugated liner core, now renamed as corrugated paper. Boxboard requires tough texture, good surface mechanical strength, paper machine pressure, moisture content of 8% to 14%. The special number is made of more than 50% of kraft pulp and waste pulp. No. 1 contains more than 300% of pulp and waste paper, brown wood pulp and other ingredients. No. 2 is equipped with chemical straw. No. 3 is made of 100% chemical half-grain pulp and No. 3 to No. 3 boxboard can be used as hardcover cover board.

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