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Manufacturing method of semichemical mechanical pulp from cornstalk

a technology of mechanical pulp and semi-chemical technology, which is applied in the field of manufacturing method of semi-chemical mechanical pulp from cornstalks, can solve the problems of forest resources being destroyed, cornstalks not being used in pulping and papermaking industries, etc., and achieve the effect of improving the fiber length and mechanical properties of the resultant pulp

Inactive Publication Date: 2007-05-03
RYU HAI IL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a manufacturing method of semichemical mechanical pulp from cornstalks that offers environmentally friendly and less chemical-based pulp with improved mechanical properties. The method involves a pretreatment process of cutting cornstalks to a size of 1 cm×1 cm to 5 cm×5 cm, a chemical treatment process of adding a mixture of caustic soda and sodium sulfite to the pretreated cornstalks and applying heat and pressure, a first refining process of defibrating the chemical-treated cornstalks with a refiner, and a second refining process of adding hydrogen peroxide and sodium silicate to the cornstalks for bleaching. The heat treatment process may further improve pulp extraction efficiency and reduce the amount of chemicals used. The method can provide a sustainable and cost-effective way to produce high-quality pulp for various applications."

Problems solved by technology

A new pulp material should be developed because fostering pulp industry results in destruction of forest resources.
However, with a plant distribution inappropriate for pulping and with a dearth of forest resources, Korea has to find a new strategy.
But, cornstalks are not used in pulping and paper-making industries, as yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] 1 kg of carefully selected cornstalks were crushed into chips of a size of 3 cm×3 cm using a crusher. The resultant chips were put in a screw presser. 10 g of caustic soda (0.1 wt % based on the weight of the cornstalk chips) was added and refining was performed at 35° C. and normal pressure to obtain semichemical mechanical pulp.

[0024] Physical properties of the semichemical mechanical pulp were measured. It had a Freeness (CSF) of 85-130 ml, a tensile strength of 1.5-3.0 kgf, a breaking length of 2.0-3.0 km and a tear strength of 17-20 g. Thus, it was confirmed to be adequate for manufacturing printing paper or other paper.

example 2

[0025] Semichemical mechanical pulp was manufactured in the same manner of Example 1, except that 140 g of caustic soda was used and a pressure of 7 kg / cm2 was applied.

[0026] Physical properties of the semichemical mechanical pulp were measured. It had a CSF of 85-120 ml, a tensile strength of 1.0-3.0 kgf, a breaking length of 2.0-3.0 km and a tear strength of 17-20 g. Thus, it was confirmed to be adequate for manufacturing printing paper or other paper.

example 3

[0027] 1 kg of carefully selected cornstalks were crushed into chips of a size of 3 cm×3 cm using a crusher. The resultant chips were put in a screw press. 60 g of sodium sulfite (0.6 wt % based on the weight of the cornstalk chips) was added and refining was performed at 35° C. and normal pressure to obtain semichemical mechanical pulp.

[0028] Physical properties of the semichemical mechanical pulp were measured. It had a CSF of 85-130 ml, a tensile strength of 1.5-3.0 kgf, a breaking length of 2.0-3.0 km and a tear strength of 17-20 g. Thus, it was confirmed to be adequate for manufacturing printing paper or other paper.

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Abstract

Provided is a manufacturing method of semichemical mechanical pulp from cornstalks capable of offering environment-friendly pulp by reducing use of chemicals, offering a method for manufacturing new Korean pulp from cornstalks and enabling manufacture of characteristic paper. The method comprises the processes of crushing cornstalks into chips, applying heat and pressure to the crushed chips with such alkaline solution as caustic soda, refining them and bleaching them by adding such oxidizer as hydrogen peroxide.

Description

TECHNICAL FIELD [0001] The present invention relates to a manufacturing method of semichemical mechanical pulp from cornstalks. More particularly, it relates to a manufacturing method of semichemical mechanical pulp capable of manufacturing environment-friendly pulp from cornstalks and manufacturing characteristic paper. BACKGROUND ART [0002] With the rise of national income, Korea has become the world's seventh largest paper (including publications, newspapers, publishing cardboards, kraft paper, bulk paper, etc.) consumer and at the same time world's ninth largest paper producer. However, most of pulp, which is used to produce paper, is imported from abroad. [0003] In an effort to meet the need for pulp materials, countries with poor forest resources like China, the Middle East and India are developing herbaceous agricultural wastes or bamboos into pulp materials. Even the sugarcane dregs discarded after sugar making are developed into pulp materials. [0004] A new pulp material sh...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H11/12
CPCD21B1/16D21C3/02D21C5/00D21C9/163A47F3/001F21S9/02F21W2131/405
Inventor RYU, HAI-IL
Owner RYU HAI IL