Wood method for pulping using cotton stalk, bush or brush

A technology for pulping and shrubs, applied in the field of pulp manufacturing, can solve the problems of ring compressive strength not meeting the requirements for producing corrugated base paper, rough pulp, poor paper bonding strength, etc., so as to shorten the soaking or steaming time and reduce the cooking temperature. , the effect of improving production efficiency

Inactive Publication Date: 2007-07-11
CHINA LIGHT IND CONSTR
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  • Application Information

AI Technical Summary

Problems solved by technology

This method has the highest pulp yield ≥ 80%, and the lowest production cost, but the pulp obtained by this method is too rough, the bond strength of paper is poor, and the ring pressure strength does not meet the requirements for producing corrugated base paper. At present, almost no domestic enterprises choose this method for production

Method used

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  • Wood method for pulping using cotton stalk, bush or brush
  • Wood method for pulping using cotton stalk, bush or brush

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The raw material used in this embodiment is cotton rod. The raw materials are cut by a drum chipper, with a size of 3-4cm; the qualified raw materials are steamed for 10 minutes at normal pressure; The parts are made of stainless steel or chrome-plated cast steel. The structural compression ratio of the screw extruder is 1:2.7, and the material compression ratio is greater than 1:4. The cooking of the raw materials after extrusion is completed in a 15-liter cooking pot. Electric heating, automatic stirring. The cooking temperature is 130°C, the time is 30min (not including the heating time), the liquid ratio is 1:4.5, the amount of caustic soda is 5%, and AQ is 0.2%. The equipment used for refining raw materials after cooking is KRK300 high-concentration disc mill, with a disc diameter of 300mm, a motor power of 30kw, and a speed of 3000 rpm; the feeding method is adjustable speed screw feeding; Between the grinding area and the crushing area and on the outer edge of ...

Embodiment 2

[0028] This embodiment also uses cotton stalk raw materials, wherein other steps are the same as in embodiment 1 except that the raw materials are soaked and boiled. Soaking: Qualified raw materials are soaked in cold water at a temperature of 20°C for 60 minutes. And the boiling temperature of raw material after rolling is 90 ℃, time 60min (not including heating time), liquid ratio 1: 4.5, caustic soda consumption 9%, AQ0.2%; Cooking container is the titanium plate impregnator volume of self-made 15 liters, constant temperature Water bath heating, manual stirring. The yield of pulp is 82.3%, and the weight of corrugated base paper made with 100% of this pulp is 108g / m 2 , fracture length 3.80km, ring pressure index 8.50N.m / g, tightness 0.52g / cm 3 , In addition to the length of the finished paper, all the indicators exceed the requirements of the national A-grade corrugated base paper.

[0029] It can be seen from Examples 1 and 2 that the pulping performance is superior, a...

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Abstract

A method for pulping with cotton stalk or bush or branch, includes the following steps:1) cut the raw material into knot (3-5cm) by equipment and the coarse one needs to be cut into knot with the diameter of smaller than 3cm; 2) immerse the material belong cut, with the ratio of material and water being 1:1-1:10 and the water temperature of 10-100deg.C for 5-60min; or use steam to steaming it for 2-30min; 3) grind the material being immersed or steamed, with the compression ration of material not smaller than 1:2 for 5-40min; 4) cook the material being grinded, use the chemicals: NaOH 1-10%, anthraquinone 0-1%, potassium hydroxide 0-10%, magnesium hydroxide 0-5%, and ammonium sulfite 0-10%, with the temperature of 7-150deg.C for 10-120min and the liquid ratio of 1:1-1:10; 5) jordaning for the density of 1-30% and beating degree 25-50Sr. The method id suitable for the raw materials like branch or bush or whole cotton stalk and the filling is suitable for or using paper pulp to manufacture corrugated paper.

Description

technical field [0001] The invention relates to a method for producing pulp, especially a method for producing pulp from cotton stalks, shrubs, or branches. Background technique [0002] As we all know, cotton stalks, shrubs (such as caragana, salix, artemisia, poplar), or branches (such as poplar, pine, willow, paulownia) are the best raw materials for making corrugated base paper. At present, these raw materials are used to make corrugated paper. The methods of raw paper pulp include: chemical method, semi-chemical method (chemical-mechanical method), and mechanical method. [0003] Chemical method: cut the raw materials into 2-3cm sections, put them into steaming balls, use 10-15% chemicals, cook at 150-160°C for 40-60min, and use Valley beater to make pulp and make paper. The pulping yield of this method is lower than or equal to 50%, the consumption of chemicals is high, the waste water is not easy to handle, and the environmental pollution is large, the production cap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C1/02D21B1/34D21B1/02D21C3/02D21C3/04D21C5/00
Inventor 曹春昱陈彬侯彦召吴玉辉张涛穆军
Owner CHINA LIGHT IND CONSTR
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