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Pretreatment apparatus for removing pith from cornstalk, pulp manufacturing method using cornstalk, and paper manufacturing method using cornstalk pulp

a technology of cornstalk and pretreatment apparatus, which is applied in the field of pretreatment apparatus for cornstalk chips, can solve the problems of increasing deteriorating difficulty in recovering the chemicals used for pulping, so as to improve the yield and quality of pulp, increase the consumption of treatment chemicals, and improve the effect of quality

Inactive Publication Date: 2013-10-24
CPNPHLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a pretreatment apparatus for removing pith from cornstalks and separating husks therefrom, which enables mass production of high grade pulp using cornstalks, and a paper manufacturing using cornstalk pulp. This technology can improve the quality of cornstalk pulp and prevent disadvantages in terms of bulkiness. The apparatus includes a casing with a baffle formed on its inner surface to enhance hitting force with respect to the cornstalks. The cooking process may include adding 0.05 to 0.2% anthraquinone to increase pulp yield and minimize dissolution of hemicellulose.

Problems solved by technology

The cornstalk pith deteriorates yield and quality of pulp, increases consumption of treatment chemicals, and causes difficulty in recovery of the chemicals used for pulping due to large amounts of silica contained therein.
Thus, the provision of a technology capable of removing pith from cornstalks is the most important issue in achieving mass production of high grade pulp using cornstalks.

Method used

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  • Pretreatment apparatus for removing pith from cornstalk, pulp manufacturing method using cornstalk, and paper manufacturing method using cornstalk pulp
  • Pretreatment apparatus for removing pith from cornstalk, pulp manufacturing method using cornstalk, and paper manufacturing method using cornstalk pulp
  • Pretreatment apparatus for removing pith from cornstalk, pulp manufacturing method using cornstalk, and paper manufacturing method using cornstalk pulp

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0126]Cornstalks were cut to a length of 1.5 cm, followed by hitting the cut cornstalks for 10 minutes in a high speed rotator and separating piths from husks of the cornstalks using screens. 400 g of the separated cornstalk chip was placed in a laboratory digester (4 liter capacity), and a sodium hydroxide solution containing 13% and 15% of active alkali was input thereto. The liquor ratio was set to 5:1 and the cornstalk chips were compressed by a metal weight so as to allow the cornstalk chips to be sufficiently dipped into cooking liquor, followed by cooling at 150° C. for 70 minutes, 90 minutes, and 120 minutes. After completing the cooking process, the cornstalk chips were subjected to washing, and rejects were removed from the cornstalk chips using vibrating screens. After completing the screening process, pulp yield, kappa number, and brightness of the cornstalk pulp were measured, and mechanical impact was applied to the cornstalk pulp for 10 minutes using a laboratory refi...

example 2

[0127]In order to evaluate characteristics of toilet paper produced from bleached cornstalk pulp, handsheets were manufactured from 100% of cornstalk bleached pulp, and the produced toilet paper was compared with Korean Industrial Standards and market products. The toilet paper using the cornstalk pulp satisfied all of burst strength, tensile strength and absorbency according to Korean Industrial Standards, and had superior burst strength to the market products.

TABLE 4Comparison of toilet paper manufactured using cornstalk pulpKSFor market sellingCornstalk pulpRollFlatDaehan (Flat)Yuhan (Flat)Basis weight (g / m2)1818 or more12.5 or more24 or more24 or moreBurst strength (kPa)13678 or more—50 or more50 or moreTensile strength1.2—0.78 or more——(N / 15 mm)Absorbency (mm)4820 or more———

example 3

[0128]In order to prove that paper exhibiting excellent properties in terms of bulkiness and opacity can be produced through combination of bleached cornstalk pulp with softwood bleached chemical pulp, hardwood bleached chemical pulp or BCTMP, laboratory studies were carried out. Ground calcium carbonate was used as fillers, and micro particles based on bentonite and cationic and anionic polyacrylamide was used as a retention agent. From test results, it could be confirmed that it is possible to improve major disadvantages of cornstalk pulp in terms of bulkiness and opacity through combination of pulp and filler addition.

TABLE 5Physical properties of handsheets manufactured from cornstalkpulp, and the mixture of cornstalk pulp and wood pulps50% cornstalk pulp,100%5% softwood pulp,40% cornstalk pulp,40% cornstalk pulp,cornstalk40% hardwood pulp,55% hardwood pulp,10% softwood pulp,Propertiespulp5% BCTMP5% softwood pulp50% hardwood pulpBasis weight70.17069.871.2(g / m2)Bulk (cm3 / g)1.051....

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Abstract

A pretreatment apparatus for removing pith from cornstalks and separating husks therefrom includes a casing that receives cornstalks in a free-fall manner through an upper side thereof and allows the corn stalks to be discharged through a lower side thereof, and a rotor inserted into the casing and rotating inside the casing to hit cornstalk chips. The rotor includes a shaft inserted into the casing to be rotated by external force, a cover member holding the shaft so as to allow rotation of the shaft therein and connected to the entirety or part of an open upper side of the casing, and a hitting unit formed on a circumference of the shaft and hitting the corn stalks input into the casing.

Description

BACKGROUND[0001]1. Technical Field[0002]The present invention relates to a pretreatment apparatus for cornstalk chips, and more particularly, to a pretreatment apparatus for removing pith from cornstalks and separating husks therefrom, a pulp manufacturing method using cornstalks, and a paper manufacturing method using cornstalk pulp.[0003]2. Description of the Related Art[0004]Generally, paper is made from wood pulp as a main raw material. For countries suffering from lack of wood resources, pulp has been produced using herbaceous plants, such as straw, bagasse, reeds, and the like. Further, pulp production is carried out in small scale in home industries, thereby providing very low grade paper and many difficulties including insufficient dewatering in a paper manufacturing process. Such circumstances lead to prejudice in favor of wood pulp as raw materials for high grade paper. However, rapid industrial development and urbanization have occurred together with severe environmental ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21B1/02D21D5/04D01B1/14D21D1/02
CPCD21B1/025D21D1/02D01B1/14D21D5/04D21H11/12D21H27/002
Inventor PARK, JONG BONGWON, JONG MYOUNG
Owner CPNPHLDG
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