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

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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

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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

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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

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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

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Pulp is a lignocellulosic fibrous material prepared by chemically or mechanically separating cellulose fibres from wood, fiber crops, waste paper, or rags. Many kinds of paper are made from wood with nothing else mixed into them. This includes newspapers, magazines and even toilet paper. Pulp is one of the most abundant raw materials.

A pulp mill is a manufacturing facility that converts wood chips or other plant fibre source into a thick fibre board which can be shipped to a paper mill for further processing. Pulp can be manufactured using mechanical, semi-chemical or fully chemical methods (kraft and sulfite processes). The finished product may be either bleached or non-bleached, depending on the customer requirements.

A paper machine (or paper-making machine) is an industrial machine which is used in the pulp and paper industry to create paper in large quantities at high speed. Modern paper-making machines are based on the principles of the Fourdrinier Machine, which uses a moving woven mesh to create a continuous paper web by filtering out the fibres held in a paper stock and producing a continuously moving wet mat of fibre. This is dried in the machine to produce a strong paper web.

The pulp produced up to this point in the process can be bleached to produce a white paper product. The chemicals used to bleach pulp have been a source of environmental concern, and recently the pulp industry has been using alternatives to chlorine, such as chlorine dioxide, oxygen, ozone and hydrogen peroxide.

Chemical pulp is produced by combining wood chips and chemicals in large vessels called digesters. There, heat and chemicals break down lignin, which binds cellulose fibres together, without seriously degrading the cellulose fibres. Chemical pulp is used for materials that need to be stronger or combined with mechanical pulps to give a product different characteristics. The kraft process is the dominant chemical pulping method, with the sulfite process second. Historically soda pulping was the first successful chemical pulping method.