Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Digesting process for modifying natural bamboo pulp and bleached wood pulp into dissolving pulp by compounding

A composite modification and bamboo pulp technology, which is applied in the field of dissolving pulp, can solve the problems of large chemical consumption, dissolving pulp quality index not reaching dissolving pulp, single raw material, etc.

Active Publication Date: 2012-10-10
YIBIN GRACE GROUP CO LTD
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the bamboo pulp prepared by this invention has the following disadvantages: 1, the yield is low, and the highest yield is only 85%
2. The α-cellulose content fluctuates greatly, from 85% to 95%, which makes the modified bamboo pulp α-cellulose content unstable
3. The average length of fibers is lower than that of paper-making wood fibers, and the content of ash and polypentose in the production process is high, and the bamboo fibers are hard, have more thick-walled fibers, narrow cell lumens, dense fiber tissues, and the presence of air in the cells leads to dissolution Difficult, large amount of chemicals
4. The viscose fiber produced by a single bamboo pulp has monotonous performance and does not show individuality
But this invention is only applicable to the modification of cotton linters and is prepared into viscose fiber. If the composite material is modified by the method provided by the invention to prepare dissolving pulp, the quality index of the modified dissolving pulp cannot reach that of dissolving pulp. Requirements, and high energy consumption, low yield
[0007] To sum up, the above-mentioned invention patents mainly have the following disadvantages: 1. The raw material is single, and the dissolving pulp produced has single performance and does not show individuality
2. A single raw material has its own disadvantages, such as high production cost, low yield, and unstable product quality
3. Outdated production equipment, high energy consumption, and uneven cooking

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A. Prepare materials

[0036] The composite pulp board in which natural bamboo pulp accounts for 40% of the composite pulp board is dispersed with a dispersing device such as a bagger, meal feeder, leaf splitter, etc., and the cutting equipment and crushing equipment such as a pulper and a pulverizer are used to disperse the mixed pulp board. Crush the pulp sheet into flocculent form, and send the flocculent composite pulp sheet into the cooking equipment with conveying equipment (fan, cyclone separator, screw conveyor). Liquid, this stock preparation method is called dry stock preparation, and its technological requirements are: a, pulp input amount 4 tons / batch, b, alkali addition amount (with fiber dry weight percentage) 13 ~ 30%, C, liquid ratio 1: 2.0, d. Quality index requirements: Natural bamboo pulp has a cellulose content of 94%, a degree of polymerization of 1200, and an ash content of 0.5%, and bleached wood pulp has a cellulose content of 91%, a degree of po...

Embodiment 2

[0049] A. Prepare materials

[0050] The composite pulp board in which natural bamboo pulp accounts for 40% of the composite pulp board is dispersed with a dispersing device such as a bagger, meal feeder, leaf splitter, etc., and the cutting equipment and crushing equipment such as a pulper and a pulverizer are used to disperse the mixed pulp board. Crush the pulp sheet into flocculent form, and send the flocculent composite pulp sheet into the cooking equipment with conveying equipment (fan, cyclone separator, screw conveyor). liquid, this preparation method is called dry preparation, and its process requirements are: a, 5 tons / batch of pulp input, b, 15% alkali addition (percentage of absolute dry weight of fiber), C, liquid ratio 1:3.0, d. Requirements for quality indicators: Natural bamboo pulp has a cellulose content of 95%, a degree of polymerization of 1000, and an ash content of 0.5%. The bleached wood pulp has a cellulose content of 93%, a degree of polymerization of ...

Embodiment 3

[0063] A. Prepare materials

[0064] The composite pulp board in which natural bamboo pulp accounts for 40% of the composite pulp board is dispersed with a dispersing device such as a bagger, meal feeder, leaf splitter, etc., and the cutting equipment and crushing equipment such as a pulper and a pulverizer are used to disperse the mixed pulp board. Crush the pulp sheet into flocculent form, and send the flocculent composite pulp sheet into the cooking equipment with conveying equipment (fan, cyclone separator, screw conveyor). Liquid, this method for preparing materials is called dry method for preparing materials, and its process requirements are exactly the same as in Example 1.

[0065] Material preparation can also be prepared by wet method. The specific steps are: using dispersing device (packing machine, meal feeder, pulper, deflagging machine) → alkali mixing device → mixing device (dipping bucket) → dehydration device (pressing machine) , Pulping machine) → crushing ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
degree of polymerizationaaaaaaaaaa
Ash contentaaaaaaaaaa
Ash contentaaaaaaaaaa
Login to View More

Abstract

The invention discloses a digesting process for modifying natural bamboo pulp and bleached wood pulp into dissolving pulp by compounding. Composite pulp is fed into a continuous digester for digestion, a continuous digesting tube of the continuous digester has three sections, a section connected with a pre-reaction bin is provided with a T-shaped tube for adding an alkaline solution and a steam tube for adding steam, the other two sections are provided with steam tubes for adding steam, and a liquor ratio is 1:(2.0-4.0); the alkaline solution is NaOH, and is added in an amount which is 17 to 23 percent based on the oven dry weight; and the compression ratio is 1:(2-3.0). Because raw materials are the natural bamboo pulp and the bleached wood pulp, the cost of preparing the dissolving pump is reduced to a large extent; meanwhile, the prepared dissolving pulp meets the requirement for the quality of dissolving pulp for viscose.

Description

technical field [0001] The present invention relates to a method for compound modification of natural bamboo pulp and bleached wood pulp into dissolving pulp, in particular to a method for compound modification of natural color bamboo pulp and bleached wood pulp into dissolving pulp, wherein the dissolving pulp refers to pulp for viscose fiber Meal, cellulose and cellulose derivatives. Background technique [0002] The application number is 200710050470.9, the authorized announcement number is CN101158125, and the authorized announcement date is April 9, 2008. The Chinese invention patent discloses a paper-making grade coniferous wood pulp board modification process, wherein the cooking process uses paper-making grade wood pulp board Use caustic soda method, sulfate method or sulfite method for cooking, and the cooking agents are NaOH, NaOH+Na 2 S, Na 2 SO 3 + NaOH, the process conditions are: 1. The total alkali concentration of the cooking liquid by the caustic soda me...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21H11/00
Inventor 薛勤徐发祥于渭东谢鹏刘爱兵杨大平竭发全
Owner YIBIN GRACE GROUP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com