How does a paper machine work?
Paper making machine is a kind of necessary equipment for every paper making mill. It can be divided into long screen type, round screen type, net type, stacking type and with decorative roller if they are divided according to the structure of the screen. A paper machine can be thought to be a combination of multiple equipments. The components of the machine are divided into two parts: wet section and dry section. The components of wet section include a flow equipment, a screen part and a press part. The components of dry section include a dryer, a calender, and a
What are the most common chemicals used in pulping process?
The most common chemicals used in the pulping process can be mainly divided into cooking aids, bleaching aids, waste paper deinking agents and other aids. Cooking aids: they are chemical auxiliary agents for accelerating the penetration of the cooking liquor into the fiber raw materials or accelerating the delignification in addition to the cooking chemicals. The cooking aids can shorten the cooking time or reduce the cooking temperature, or reduce the amount of cooking agents and increase the pulp yield or strength. Na2SO3 can be added to the alkaline sodium sulfite process when cooking in the caustic soda process. Na2SO3
How is pulp made into paper?
Paper is made of the pulp through the processes of pulp blending, paper processing and paper making. To put it simply, paper is to be added with various auxiliary chemicals into the pulp, then purify and screen the latter again and finally be produced out by pressing dehydration, drying, and cutting. Therefore, pulping is the first step in paper making. Generally, there are three ways to convert raw material into pulp: mechanical pulping, chemical pulping and semi-chemical pulping. Pulp adjusting is another key point. The strength, color, printability and life of paper are directly related to it. Common pulp adjusting
How is paper manufactured step by step?
The papermaking process flow can be divided into main steps of pulping, paper processing, paper making, etc. Pulping section: Raw Material Selection→ Cooking and Separating →Washing→ Bleaching→ Washing and Screening →Thickening or Making into Pulp Sheet→ Storage Paper processing section: Repulping→ Deslagging →Refining→ Beating → Various Additives Adding → Mixing → Flowing → Head Box → Screen Part → Pressing → Drying → Sizing → Drying → Pressing Light → Winding → Coating → Drying → Rolling Paper making section: Rewinding → Cutting and Trimming → Sorting and packaging → Storage
What is the pulping process?
Pulping is the process of separating plant fibers from raw materials of and obtaining pulps. The pulping process can be mainly divided into mechanical method, chemical method and chemical-mechanical method to obtain mechanical pulp, chemical pulp and chemical-mechanical pulp respectively. Pulping purpose The lignin is eluted in raw material, and the material is separated into single fibers, and the specific surface area (surface area per unit weight of the fiber) of the fiber is increased. Pulping requirements Under the premise that the fiber is not damaged or less, the plant fiber is separated into monomer fibers, and the pulp