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Method for fabrication food wrap paper and cultural paper by using corn stalk to make no chlorin bleached pulp

A corn stalk, completely chlorine-free technology, applied in the field of pulping and papermaking, can solve the problems of not highlighting and stressing alkali strengthening, and achieve the effects of improving environmental protection quality, being beneficial to environmental protection, and being easy to biochemical treatment.

Inactive Publication Date: 2007-01-17
田新 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogen peroxide bleaching does not use the activator thiourea or urea, and the usual oxygen-alkali treatment and hydrogen peroxide bleaching are used for bleaching (line 17, page 1 / 3 of the manual, ②Secondary PO bleaching), but the amount of alkali used For the usual low dosage, without highlighting and emphasizing the role of alkali strengthening in hydrogen peroxide bleaching

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Corn stalks are used as raw materials for cooking. After cutting, dedusting and presoaking, they are put into the digester. The weight percentage of the medicine to the absolute dry corn stalks is:

[0026] Ammonium sulfite 15~20%

[0027] Potassium sulfite 3~7%

[0028] Urea 1.5~3.5%

[0029] Sulfur 0.5~2%

[0030] The technical conditions of steaming ball cooking are: liquid ratio 2.8, heating time 1 hour, temperature rising 160°C, heat preservation 2 hours.

[0031] Pulp bleaching adopts a hydrogen peroxide bleaching process in which oxygen and alkali are simultaneously strengthened and urea is activated. The bleaching process is:

[0032] Medicine is to absolute dry unbleached pulp weight percent:

[0033] Hydrogen peroxide 0.5~2%

[0034] Urea 0.4~1.5%

[0035] Magnesium Sulfate 0.3%

[0036] Sodium silicate 1~3%

[0037] Sodium hydroxide 2~6%

[0038] Pulp consistency 8%

[0039] Oxygen flow under oxygen pressure 0.5MPa

[0040] Treat at 80°C for 1 hour...

example 2

[0042] The depilled corn stalks are used as raw materials for cooking. After cutting, dedusting and presoaking, they are put into the digester. The weight percentage of the medicine to the absolute dry depiped corn stalks is:

[0043] Ammonium sulfite 15~24%

[0044] Potassium sulfite 3~10%

[0045] Urea 1~4%

[0046] Sulfur 0.35~3%

[0047] The technical conditions of steaming ball cooking are: liquid ratio 2.8, heating time 1 hour, heating up to 165°C, holding for 2 hours,

[0048] Pulp bleaching adopts a hydrogen peroxide bleaching process in which oxygen and alkali are simultaneously strengthened and urea is activated. The process conditions are:

[0049] Medicine is to absolute dry unbleached pulp weight percent:

[0050] Hydrogen peroxide 0.8~3%

[0051] Urea 0.5~2%

[0052] Magnesium sulfate 0.3~1%

[0053] Sodium silicate 1~4%

[0054] Sodium hydroxide 2.5~7%

[0055] Pulp consistency 8%

[0056] Oxygen flow under oxygen pressure 0.5MPa

[0057] Treat at 90°C ...

example 3

[0059] The pith-removed corn stalks are used as raw materials, after being cut, dust-removed and presoaked, they are put into a digester.

[0060] Sodium sulfite 12~20%

[0061] Potassium sulfite 2~5%

[0062] Sodium hydroxide 1.5~5%

[0063] Sulfur 0.3~1%

[0064] The technical conditions of steaming ball cooking are: liquid ratio 3, heating time 1 hour, temperature rising 155°C, heat preservation 2 hours.

[0065] Pulp bleaching adopts a hydrogen peroxide bleaching process in which oxygen and alkali are simultaneously strengthened and urea is activated. The process conditions are:

[0066] Medicine is to absolute dry unbleached pulp weight percent:

[0067] Hydrogen peroxide 0.8~2%

[0068] Urea 0.5~1%

[0069] Magnesium sulfate 0.3~1%

[0070] Sodium silicate 1~3%

[0071] Sodium hydroxide 1.5~5%

[0072] Pulp consistency 8%

[0073] Oxygen flow under oxygen pressure 0.5MPa

[0074] Treat at 90°C for 1 hour to obtain fully chlorine-free bleached pulp, paper and c...

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PUM

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Abstract

A process for preparing food packing paper and cultural paper with chlorine free bleached paper pulp includes using corn straw or its pitch free ones as raw material, then cutting, dust removing, presoaking, cooking and bleaching. The cooking reagent uses ammonium sulfite and potassium sulfite or sodium sulfite as main, sulfur or sulfourea as assistant and urea as well as sodium hydroxide as buffer. The bleaching is two sections or multisection bleaching by using urea or sulfourea to protect fibre and activate hydrogen peroxide.

Description

technical field [0001] The invention belongs to the technology of pulping and papermaking, and in particular relates to a process for producing fully chlorine-free bleached pulp by using corn stalks and depitted corn stalks to produce food packaging paper and cardboard or cultural paper and cardboard that are in direct or indirect contact with food and human body technology. Background technique [0002] The paper industry usually uses long-fiber coniferous wood, medium-fiber long-leaved wood, bamboo, reed and short-fiber rice and wheat straw as the basic raw materials for papermaking. Alkaline) cooking and acid cooking process, using alkali or acid as the main cooking agent; neutral sodium sulfite method (Na 2 SO 3 as cooking agent) and alkaline sodium sulfite method (Na 2 SO 3 Add NaOH as cooking agent). Bleaching treatment generally adopts hypochlorite single-stage bleaching H; chlorination C or chlorine dioxide D, alkali treatment E, hypochlorite H, that is, C / D-E-H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/00D21H27/10D21C3/06D21C3/00D21C1/00
Inventor 田新罗少初
Owner 田新
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