New technique for improving paper strength by joint gelatinization of starch and pulp

A slurry concentration and slurry technology, which is applied in paper, special paper, textiles and papermaking, etc., can solve the problems of low surface strength, poor paper strength, and influence of paper strength, so as to achieve tight fiber wrapping and reduce starch loss , Improve the effect of strength index

Inactive Publication Date: 2009-12-09
NANJING FORESTRY UNIV
View PDF3 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, after the waste paper pulp is reused many times, the performance of the fiber itself will be affected, and the fiber will become finer and harder, which is not conducive to beating treatment, and the strength of the paper is also very poor.
During the application process, there will be low surface strength and the status quo of shedding hair and powder
[0004] (2) The cost of the existing dry strength agent is relatively high, such as cationic starch and cationic polyacrylamide, the cost is relatively high. If raw starch, oxidized starch and other relatively cheap materials can be used as the dry strength agent, the cost can be greatly saved
[0005] (3) The limitation of the retention rate when the starch is used in a high amount
For fiber raw materials with poor quality, the strength of the produced paper is eve

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • New technique for improving paper strength by joint gelatinization of starch and pulp
  • New technique for improving paper strength by joint gelatinization of starch and pulp
  • New technique for improving paper strength by joint gelatinization of starch and pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052]10g dry mechanical pulp, use oxidized starch, the amount of starch is calculated based on the dry weight of the pulp, the concentration of the pulp is heated to 15%, the temperature is 100°C, and the time is 60min. After heated and gelatinized, it is extruded and concentrated, and the slurry concentration reaches 43%. The specific enhancement effect and starch loss are shown in the table below:

[0053] Quantitative

Embodiment 2

[0055] According to the ratio of 10% coniferous pulp, 10% mechanical pulp, and 80% broad-leaf pulp, the dry-dried slurry is 10g, and oxidized starch is used. The amount of starch is calculated based on the dry mass of the slurry. The concentration of the heated slurry is 15%. at 100°C for 60 minutes. After heated and gelatinized, it is extruded and concentrated, and the slurry concentration reaches 38%. The specific enhancement effect and starch loss are shown in the table below:

[0056] Quantitative

Embodiment 3

[0059] Waste paper pulp fiber dry 20g, the amount of oxidized starch 0%, 5%, 10%, 15%, 20%, 25%, squeeze concentrated to a slurry concentration of 38%, and heat at 100 ° C for 30 min to gelatinize. See the table below for enhancements:

[0060] Starch dosage

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

No PUM Login to view more

Abstract

The invention belongs to the technical field of paper strengthening, in particular to a method using starch as a paper dry strengthen agent. The method comprises the following steps: uniformly mixing starch accounting for 0.5-25% of oven dry mass of pulp with pulp, carrying out extrusion and concentration, heating for 8-150min at 70-100 DEG C to gelatinize starch, carrying out defibering and dispersion on the heated pulp, and manufacturing paper with pulp. The invention has simple process, low production cost and less pollution, improves the strength of paper by 30-110%, has above 80% of starch retention ratio, and can improve the retention ratios of fillers and fiber fines.

Description

technical field [0001] The invention relates to a process method for papermaking reinforcement, and belongs to the technical field of pulping and papermaking technology. Background technique [0002] The traditional methods of paper strengthening are physical methods of beating or chemical methods of adding strengthening additives. Considering the deficiency of beating to improve the strength, various dry strength agents are usually used to improve the strength of paper. A class of fine chemicals used to enhance the dry strength of paper and board is called dry strength agents. There are four main types of dry strength agents: (1) Synthetic polymers. Such as polyacrylamide, polyvinyl alcohol, urea-formaldehyde resin and melamine resin. (2) Modified starch. Such as cationic starch, anionic starch, amphoteric starch, nonionic starch, etc. (3) Cellulose, chitin derivatives and plant gums. Such as carboxymethyl cellulose, chitin, chitosan and so on. (4) Resin barrier cont...

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
IPC IPC(8): D21H27/00D21H23/04D21C3/22D21C9/18D21H17/28D21H17/67
Inventor 周小凡
Owner NANJING FORESTRY UNIV
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap