Views: 0 Author: Site Editor Publish Time: 2022-07-07 Origin: Site
According to the different wire structure of papermaking pulping equipment, papermaking and pulping equipment can be divided into: Fourdrinier wire type, rotary wire type, sandwich wire type, stacked wire type and facing rolls. Paper pulping equipment can be regarded as a linkage composed of multiple equipments. Usually it can be divided into two parts: wet part and dry part. The wet end includes the stock flow equipment, the wire section and the press section; the dry end includes the dryer section, calenders and reels.
After pulping, sizing, filling and purification, the pulp with properties suitable for papermaking enters the pulping equipment of the pulping equipment at a concentration of 0.3%-1.3%. Furthermore, after the paper stock is distributed and leveled by the stock flow distributor and the headbox, it flows to the wire surface of the moving forming wire uniformly and stably. After the pulp flow is netted near the centerline of the breast roll on the wire table, it is gradually filtered and dewatered to form a continuous wet paper web. Forming-dehydrating elements such as case rolls, vacuum suction boxes, couch rolls, etc. are usually arranged on the net case. When the wet paper web is dehydrated to a certain dryness (usually about 20%), it can be peeled off from the wire surface and sent to the press section for continued dehydration.
The press section of the paper pulping equipment is composed of several groups of roller presses. The wet paper web is dragged by the press felt and dewatered by mechanical pressing between the press rolls. In order to maintain the good dewatering performance of the press felt, the upper press roll is equipped with a felt washing device. After the press section, the dryness of the wet paper web is generally about 40%.
The wet paper web is further dewatered on the paper machine, usually by heating and evaporative drying. The drying section of a paper pulping plant usually consists of a number of drying cylinders which are heated from the inside with steam. The drying cylinder is covered with a dry felt (or canvas, dry wire), the purpose is to press the paper web to the cylinder surface, improve the heat transfer efficiency and improve the surface quality of the paper web. After drying, a calender consisting of 6-8 rolls is usually used to improve the surface quality of the paper web. Finally, it is rolled into a paper tube with a reeling machine for further processing in the entire decoration section.