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News > Dynamic industry > Basics paper industry

Basics paper industry

1. What are the modern papermaking raw materials?
A: The modern papermaking plant fiber raw materials (wood, bamboo, grasses, etc.), mineral fibers (asbestos, glass, etc.), other fibers (nylon, wire, etc.), as well as petroleum cracking resulting polymer materials. At present, the paper used for writing, printing, packaging is still mainly made from plant fiber as the main raw material.
2. The types of papermaking plant fiber materials have?
A: At present the paper industry with plant fiber materials can be divided into two categories:
Wood fiber material: plant fiber obtained directly from the trees.
Non-wood fiber raw materials: grass fiber material is divided, bast fiber material and seed wool fiber materials.
3. What is the composition and role of the paper is commonly used accessories?
A: Accessories refers to meet different performance paper and added to the paper in a variety of additives. By packing materials, plastic materials, pigment and other chemical additives components.
Fillers can improve the smoothness of the paper and opacity; sizing the paper can have water resistance; pigment can increase the whiteness of the paper; dyes to give the paper color; other chemical additives can change the nature of the paper, in order to provide some special-purpose paper.
4. What is the role of plastic material is?
A: The production of plant fiber paper, the fibers themselves and between fibers due to the presence of a large number of pores, and of cellulose fibers, hemicellulose contains a lot of hydrophilic hydroxyl groups, they are able to absorb water or other liquids. To make the paper will not be water or other liquid infiltration, need to join with anti-liquid colloidal substances or film material, namely plastic material in the paper, giving the paper against liquids penetration and diffusion properties. Process of applying a compound called sizing in the paper industry.
5. What are the methods of sizing?
A: Depending on the method of sizing sizing effect is divided into two kinds of internal sizing and surface sizing. Internal sizing is the plastic material added to the pulp, and then copied to have repellent paper and cardboard. Common rubber gum rosin and synthetic rubber material. The surface is coated with a thin layer of glue plastic material in the paper surface, so that the paper has a repellent properties. Common compound starch, gelatin, and synthetic materials. Mainly used for surface sizing offset paper, writing paper and have requested repellent wrapping paper and cardboard.
6. Impact on the printed paper surface sizing performance of what?
A: ① increase water resistance of the paper and the surface strength, offset printing paper can reduce linting; ② improve printability, if the surface is too small rubber, printing ink, the paper will absorb too much of the link material, resulting in imprinted dull. Conversely, if the surface of the rubber too, will slow down the ink drying rate, resulting in smearing and light stain; ③ increase erasable paper, surface sizing reduces the penetration of ink, thus easy to wipe off the ink, increasing the the anti-friction paper capacity; ④ increase the strength of the paper, such as bursting, folding and tensile strength; ⑤ reduce paper sidedness and deformation.
7. What is the role of filler?
A: The filler is to enable the paper to obtain specific properties, such as whiteness, opacity, smoothness, etc., at the same time, the filler added to make the paper thin internal voids become smaller, thereby increasing the paper's ink absorption and ink absorption becomes so uniform. Often added to the slurry of water-insoluble or sparingly water-soluble mineral content in the printing paper is about 10% -25%, the addition amount of different paper different, and may vary greatly
8. printing paper packing What features should be?
A: printing paper filler should have high brightness, high refractive index, fine particles, low water solubility, low density and good chemical stability, in addition, the best resource-rich, low prices.
9. Common packing printing paper have?
A: The most commonly used inorganic fillers are talc, clay, titanium dioxide and calcium carbonate. Which is an expensive high-quality titanium dioxide filler; organic synthesis filler for some polymer material.
10. The impact of the filler on the properties of printing paper have?
A: printing paper added fillers can improve the printability of paper, such as increasing the whiteness of the paper, smoothness, opacity and stiffness. Improving paper ink affinity, softness and stability, helping to improve the print quality. Of course, the paper added the amount of filler is too high also brought some adverse effects, mainly for the reduction and sizing effect of the decline in paper strength, prone to dusting in printing, hair loss phenomenon, filler particles are delivered to the plate and blanket will produce the cloth paste version of such phenomena; there is friction due to the filler, will wear plates, but with precipitated calcium carbonate (PCC) plus fill the wear plate can be reduced to a minimum (Kim Dong currently used).
11. What is the opacity of the paper?
A: Opacity refers to the opaque nature of the paper, the opacity of the paper depends on the amount of light scattering ability of the paper, the paper interface internal light scattering (ie, independent of the number of particles inside) and the refractive index of the scattering screen size differences. The more light scattering interface, the greater the difference in refractive index between the scattering interface, the greater the light scattering ability of the paper, the higher the opacity.
12. The filler material can affect the opacity of the paper?
A: No added filler paper is composed of fibers and air. The air present in the pores between the fibers, due to the different refractive index of air and fibers, and therefore when a light beam is irradiated to the paper surface, i.e., some of the scattered light in the fiber and the air interface, to give it the certain (lower) opacity , reflected in the printing, mainly as easily offset. After the addition is greater than the refractive index of the filler in the paper of cellulose, increasing the number of light scattering within the paper interface, i.e., between the fibers and the presence of air, between the filler and the fibrous filler and the air between the three different types of interfaces as well, in the three interface between the filler and the refractive index of air larger difference. Therefore, to get the maximum light scattering in the packing and air interface, resulting in increased opacity.
13. How to improve the paper surface smoothness filler?
A: interwoven fibers to form a network there is always a large number of pores and the surface asperities, the fine particles after adding a filler capable of improving paper softness and plasticity, calendering treatment can be carried out better, thereby improving calendered paper smoothness.
14. How fillers on paper strength of influence?
A: The fiber bonding strength of the paper is the basis, the filler is added to reduce the binding between the fibers, so decreased significantly large amount of filler added will make paper strength. Where the tensile strength, folding and bursting larger decline, tear drop is small, there is a certain amount of use of fillers restrictions.
15. affect bulk packing paper?
A: The density of paper fiber is about 1g / cm3, and the density of the filler, mostly in 2.5-3.0g / cm3. Therefore filler added will reduce the bulk of the paper. But when the amount of filler added is less, bulk increases with increasing the amount of filler, short fibers of the paper is particularly evident.
16. filler affects the stiffness of the paper?
A: The stiffness of the paper is the paper thickness and elastic modulus function. The impact on the stiffness of the packing filler should impact on bulk and tensile strength are taken together. When the addition amount of filler hours, the filler is added do not substantially affect the stiffness of the paper, when adding an additional amount of filler, the stiffness is significantly decreased with the amount of filler increases.
17. What is the role of the pigment in the paper?
A: Even after the bleaching process of pulp fibers is slightly yellow or gray, which is due to the lignin contained in the pulp fibers tend to absorb 400-500nm wavelength caused in purple and blue light, the more the pulp lignin content , its color also deeper. So to make the paper has a higher whiteness, often adding blue and purple or red-blue dye bleach pulp. Production must also be dyed colored paper handling.
18. What are the components of the pigment?
A: The pigment is used in paper dyeing and color pigments and dyes. Most of inorganic pigments are, most water-insoluble; dyes are synthetic dyes and natural dyes of the points, the current synthetic dyes had completely replaced natural dyes, most of the dye can be dissolved in water, after chemical treatment or soluble in water.
19. The paper materials other chemical additives and effect?
A: In order to meet the needs of some special-purpose paper, often in the pulp or paper mixed with various types of non-fibrous additives. Divided according to their use can be divided into the following categories:
① wet strength agent. To increase the wet strength agent is a wet strength of paper sheet and added auxiliaries such as urea-formaldehyde resin and phenol resin.
② dry strength agents. Such as cationic starch, polyacrylamide and the like.
③ retention aid. To reduce the loss of filler during papermaking and fines and additives added, an amine such as polypropylene, polyethylene oxide, and polyethyleneimine.
④ defoamers. Papermaking process used to eliminate foam. Such as silicone oil, turpentine, tridecyl alcohol, tributyl phosphate, pentanol and octanol.
⑤ water repellent. Water capacity is mainly used against the paper have high requirements. Such as paraffin wax, metal soaps, glyoxal, melamine resin and acrylic A wake-dimethylamino acetate and the like.
20. How to make a simple classification of paper?
A: It usually depends on the use of paper can be divided into cultural paper, industrial paper, tissue paper and special paper, fine paper which can be simply divided into non-coated paper and coated paper. Without the paper coating process is called non-coated paper, such as newsprint, offset paper, electrostatic photocopying paper and writing paper; paper coating process by the called coated paper, such as coated paper, paper calendars, Asia glossy paper, glass or cardboard.

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