Wood Pulp Production
- Capacity: customization is available
- Equipment: pulp digester, washer, mixer, screen, bleacher, dryer, etc.
The wood pulp production is a important link in paper industry. It involves in wood and other fiber to turn into paper pulp by mechanical or chemical means. The wood pulp has core equipment including pulp digester, Washer, Bleacher, etc.
Types of Wood Pulp
Softwood pulp
softwood pulp is usually made from conifer species such as pine, softwood pulp usually has longer fibers and is suitable for paper that requires higher wet tension and fiber interweaving properties such as cement bag paper, envelope paper, and plastic sealing paper.
Hardwood pulp
hardwood pulp is mainly made from broad-leaved trees such as birch, poplar and eucalyptus. Hardwood pulp has relatively short fibers. It is suitable for the production of wrapping paper and paperboard, especially industrial paperboard.
Chemical Wood Pulp
Sulfate wood pulp: Sulfate wood pulp is produced by using a mixture of sodium hydroxide and sodium sulfide as a cooking agent. Because liquid medicine is relatively mild, the fiber is not strongly eroded. The paper is powerful and has excellent folding resistance and breaking resistance. Sulfite pulp: Sulfite pulp is made from a mixture of sulfite and acid sulfite as a cooking agent. The pulp has long fibers. The paper produced in this way has good toughness, high strength and easy bleaching.
Mechanical Wood Pulp
Mechanical pulp adopted the rotation of the mechanical friction, including stone ground wood pulp, and brown ground wood. In this way, the raw material of lignin is hardly dissolved. So the production cost is lower, it is difficult to bleach, and easily decomposes under light.
Chemomechanical pulp
Chemomechanical pulp is made of chemical pretreatment and mechanical grinding. Firstly, the hemicellulose in the wood is removed by chemical pretreatment. At the same time, it retains lignin and softens the intercellular layer. Then a disk mill grinds the softened chips and separates the fibers into pulp.
making of wood pulp
- STEP 1: Raw material cutting: Wood pulp is made of wood as a raw material, wood needs to meet environmental standards.
- STEP 2: Grinding: The wood needs to be pre-processed and cut to a suitable size to make wood pulp. This process is known as grinding and can be done manually or mechanically.
- STEP 3: Soaking: Put the ground wood into the soaking container, and add chemicals and water to soak. In this way, it could dissolve the useful components such as cellulose in the wood.
- STEP 4: Pulping: After soaking, the wood pulp is mixed with chemicals for pulping. In the pulping process, it is essential to pay attention to controlling the temperature, PH value and stirring time of the pulp.
- STEP 5: Bleaching: The wood pulp has colors after making pulp and usually needs to be bleached, it usually uses chemicals such as hypochlorous acid or sodium hydroxide.
wood pulp making machine
Pulp Digester
The making wood pulp generally uses the vertical digester. The pulp digester is the main equipment for making chemical pulp. Fiber raw materials and chemicals are added to it. Finally, product is wood pulp under high temperature and high pressure treatment.
Washer
Vacuum pulp washer is a core pulp washing equipment, used for wood pulp, straw pulp and other pulp. It could solve water pollution and use alkali recovery engineering equipment. It is made of drum, tub, plane distribution valve, washing device, etc.
Bleacher
APMP poplar pulp bleaching machine is by the screw extrusion kneading machine extrusion engineering principle, uses modern pulping technology, is a set of chemical impregnation, grinding, washing, and bleaching in one of the new pulping equipment.
Use of Wood Pulp
Paper
paper production is one of the main uses of wood pulp. Paper made of wood pulp has good tearing and strength. So paper made from wood pulp can be used for books, newspapers, magazines, and packaging boxes.
Additives
Wood pulp can also be responsible for chemical production. Chemical components such as cellulose, hemicellulose and lignin in wood pulp can be separated and then produce some useful chemicals. Cellulose ester can make medicine, food additives and cosmetics. Hemicellulose can make cigarette paper, candy, tape, etc. Lignin can make pigments, dyes and cosmetics.
Building material
Wood pulp is also used for building. Wood pulp can be made some important building materials, such as sound insulation panels, heat insulation panels, protective panels and so on.
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