2. Cutting. Put the peeled wood into the chipper.
3. Cooking broken wood. Send the wood chips into the digester, and the digester adds chemicals to turn them into wood pulp.
4. After the wood pulp is cleaned and bleached, it is sent to the mixer.
5. Pulp. Wood pulp, water and minerals are mixed together to become pulp.
6, pulp into the paper machine. In this step, some water will be removed from the pulp and become a wet pulp belt, in which the fibers will be gently pressed together by the roller.
7. Water extrusion. The pulp moves along the belt, then the water is removed and becomes more compact.
8, ironing. Roller with smooth surface, the paper surface is pressed smoothly and then wound on the big roller.
9. cutting.
Extended data:
Proper ratio of long fiber and short fiber is the premise of copying soft toilet paper. Long fiber pulp can give toilet paper enough strength, while short fiber pulp has great influence on hand feel, especially softness.
Good beating process is the guarantee of producing soft toilet paper. For the papermaking of toilet paper, the beating process must be strictly controlled because the pulp with different fiber lengths is used as raw material. Generally speaking, long fiber pulp must be beaten to give toilet paper enough strength, and its beating degree can be controlled at 30 ~ 45 "Sr, while short fiber or waste paper pulp is mainly fluffed, supplemented by light cutting, and its beating degree can be controlled at 20 ~ 30" Sr. Generally, the beating degree of the sizing agent is controlled at 28 ~ 40.
The role of dispersant and softener can not be ignored. Adding proper dispersant to the sizing agent can obviously improve the evenness of the paper and achieve the purpose of improving the softness and feel of the paper. At present, most domestic manufacturers use imported PEO-WF or domestic PEO as dispersant. When using PEO, attention should be paid to the selection of its molecular weight, preparation method (preparation concentration and dissolving and stirring speed), control of addition amount (general1.0 ~1.5 kg/t paper) and the influence of production water quality.
The correct wrinkling process is the key to copying high-grade toilet paper. Wrinkling is to peel off the paper closely attached to the surface of the dryer, and at the same time, the paper is slightly curled to produce wrinkles.
References:
Baidu encyclopedia toilet paper machine