Clean pulping process for straws by mechanical method

A technology of clean pulping and mechanical method, applied in pulping of cellulose raw materials, textiles and papermaking, papermaking, etc., can solve the problems of less than 10% comprehensive utilization rate, immature pulp of ammonia blasting technology biodegradation technology, environmental pollution, etc. , to achieve the effects of promoting local economic development, increasing farmers' income, and protecting the natural environment

Inactive Publication Date: 2010-06-02
邹平海华科技包装材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The annual output of crop straw in my country is as high as 600 million tons, of which about 450 million tons can be collected, but the comprehensive utilization rate is less than 10%. In the existing rural areas, most straws are disposed of by burning, which pollutes the environment
However, cooking pulping will form papermaking waste liquor that is difficult to treat (alkali cooking will form black liquor, and sulfite cooking will form red pulp), which will cause serious pollution to the environment.
The rest of the steam explosion technology, ammonia explosion technology, biodegradation technology pulp, etc. are still immature

Method used

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  • Clean pulping process for straws by mechanical method
  • Clean pulping process for straws by mechanical method
  • Clean pulping process for straws by mechanical method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1) The straw is sent to the tearing machine with a conveyor belt, and the straw is cut into 3-5cm long filaments by the tearing machine, and 800 kg of water is added to each ton of straw through the outlet of the tearing machine for full wetting, and it is piled up for 48 hours. Natural saccharification of straw by accumulating the heat generated by itself;

[0015] 2) Transport the straw that has undergone natural sugar in step (1) to the straw pretreatment machine for wetting, swelling, and disintegration by a belt conveyor, and add water to the straw pretreatment machine to make the weight percentage concentration of the straw-water mixture Controlled at 9.5%, the straw pretreatment machine has a rotatable blade, which can further break down the straw;

[0016] 3) Transport the straw-water mixture that has been wetted, swelled, and disintegrated in step (2) to a screw dehydrator for dehydration, and when the water is dehydrated to a concentration of 38% by weight of ...

Embodiment 2

[0022] 1) The straw is fed into the tearing machine with a conveyor belt, and the straw is cut into filaments of 3-5 cm in length by the tearing machine, and 1000 kg of water is added to each ton of straw through the outlet of the tearing machine to fully wet the straw and piled up for 50 hours. Natural saccharification of straw by accumulating the heat generated by itself;

[0023] 2) Transport the straw that has undergone natural sugar in step (1) to the straw pretreatment machine for wetting, swelling, and disintegration by a belt conveyor, and add water to the straw pretreatment machine to make the weight percentage concentration of the straw-water mixture Controlled at 10%, the straw pretreatment machine has a rotatable blade, which can further break down the straw;

[0024] 3) Transport the straw-water mixture that has been wetted, swelled, and disintegrated in step (2) to a screw dehydrator for dehydration, and when the water is dehydrated to a concentration of 42% by w...

Embodiment 3

[0027] 1) The straw is sent to the tearing machine with a conveyor belt, and the straw is cut into 3-5cm long filaments by the tearing machine, and 900 kg of water is added to each ton of straw through the outlet of the tearing machine to fully wet it, and it is piled up for 49 hours. Natural saccharification of straw by accumulating the heat generated by itself;

[0028] 2) Transport the straw that has undergone natural sugar in step (1) to the straw pretreatment machine for wetting, swelling, and disintegration by a belt conveyor, and add water to the straw pretreatment machine to make the weight percentage concentration of the straw-water mixture Controlled at 9%, the straw pretreatment machine has a rotatable blade, which can further break down the straw;

[0029] 3) Transport the straw-water mixture that has been wetted, swelled, and disintegrated in step (2) to a screw dehydrator for dehydration, and when the water is dehydrated to a concentration of 40% by weight of the...

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Abstract

The invention provides a clean pulping process for straws by a mechanical method. In the pulping process by the mechanical method, a characteristic that interfibrillar lignin is converted into a softer rubber state from a glass state at certain temperature is utilized, so fibers are separated. In the production process, any chemicals are not added, the generation of papermaking waste liquor is eliminated, and the problem of pollution of wastewater in the papermaking production is radically solved. The mechanical pulp of the straws produced by the process can manufacture fluting medium paper and spool fiber boards; and disposable tableware produced by the mechanical pulp of the straws has the advantages of beautiful appearance and good environmental protection.

Description

technical field [0001] The invention relates to a pulp manufacturing method, in particular to a straw mechanical clean pulping process. Background technique [0002] The annual output of crop straw in my country is as high as more than 600 million tons, of which about 450 million tons can be collected, but the comprehensive utilization rate is less than 10%. Most of the existing rural areas use incineration to deal with straw, which pollutes the environment. There are many practical technologies at home and abroad for the comprehensive utilization of crop straws. Its use can be roughly divided into three categories: as industrial raw materials (mainly used for papermaking), as livestock feed, as fuel or biomass energy. At present, straw pulping is mainly chemical pulping. The traditional chemical pulping method is cooking method. Substance that binds cells to each other and consolidates them. The method of cooking is to make the lignin in the raw material react with the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/22
Inventor 苏河山张佰海谢志琪王夏华牛钰
Owner 邹平海华科技包装材料有限公司
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