China non woven wipes

Wood pulp nonwoven 2

Wood pulp fiber is divided into coniferous wood pulp fiber (such as pine, larch, pine, spruce, etc.) and hardwood pulp fibers (such as birch, poplar, linden wood, eucalyptus, maple, etc.) two types of . Molded pulp products has some strength because of the need and can withstand stretching, slurry generally add 15-20% of coniferous pulp.

Straw fiber was divided into:

(1) Wo Division fiber raw materials (such as straw, wheat straw, reeds, bamboo, bagasse, etc.);

(2) bast fiber material (such as hemp, kenaf, flax, mulberry, cotton stalk, skin, etc.);

(3) types of wool fiber material (such as cotton fiber, etc.).

2, wood pulp and straw pulp of the difference between the physical and chemical properties

(1) their different fiber morphology and physical conditions. Coniferous wood fiber is longer, usually 2 .56-4.08 mm in length, width 40.9-54.9 microns, the aspect ratio of more than 70 times in the following; broad-leaved wood fiber is short, usually about 1 mm in length, its more than 60 times the aspect ratio; grass fibers, bagasse raw material fiber is longer, at about 1.01-1.60 mm, width 5.9-13.4 microns, the aspect ratio of more than 115 times; Mount straw as raw material fiber length about 0.81-2.58 mm, width 13.2-19.6 microns, the aspect ratio of more than 100 times.

(2) the composition of different fibers. Plant fiber raw materials is the main component including cellulose, hemicellulose and lignin of three. Second is the ingredients, including pectin, starch, tannins, pigments, resin, fat, wax, ash.

Cellulose present in all plant cell walls, is the main component of plant fiber, about 40-98%, which is strongly in the pulping process should seek to retain more.

Non-cellulose carbohydrates hemicellulose, hemicellulose amorphous structure of loose, easy-to-swelling absorbent, easily soluble in dilute alkali. Straw in the hemicellulose content of about 30% of its similar chemical properties and cellulose, but the reaction was faster and easier than cellulose. Hemicellulose in the pulping process also should be strongly retained part.

Lignin is a structural unit composed of phenylpropanoid natural aromatic polymer, not a single material, the nature of this type of material similar to the general term, is an amorphous material, generally with Straw Lignin 20%, raw materials containing more lignin, the pulp and the more difficult because of lignin so that the fibers stick together with each other. Chemical pulp is used in chemical fiber raw materials so that dissolution of lignin, so that each separated into pulp fibers.

(3) their chemical composition is different. Softwood strict organizational structure, hybrid cell content of less chemical pulp in the hybrid cells lost more time in the wash, so good quality pulp, lignin content is high, at between 25-35% and pentosan content is low, between 9-12% more than in the fiber is not easy absorbent profit rose, beating the more difficult; broad-leaved wood structure more closely, and contain more complex cells than softwood lignin content is low, usually between 20-24% and pentosan content was high, generally between 21-24%, so beating easy; grass pulp is characterized by pentosan content was high, generally about 20% or more, fiber is easy hydration, lignin content low, all below 15%, higher ash content than wood. Grass pulp wood pulp containing more than the anionic impurities, such harmful impurities in the wet ion accumulation of a number of cationic additives will become worse, may even completely fail to cationic additives. Its high negative electricity to also affect the pulp flocculation of fine fibers and the reduction of hydrogen bonding between the fibers and thus affect the treatment of pulp fibers remain and, in severe cases will result in sticky nets and plug the hole mold.

(4) their different fiber surface potential. Slurry of fiber, small fiber, soluble organic colloids (dissolved organic matter and colloidal substances collectively referred to as ion exchange), fillers generally with a certain amount of negative charge, due to raw materials, production process such as the difference, change the scope of large, their surface charge properties and potential values are also different.