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Calendaring preparation method for environment-friendly paper from paper mill sludge

A technology of papermaking sludge and environmentally friendly paper, which is applied to flat products, applications, household appliances, etc., and can solve the problems of reducing sheet density and increasing porosity

Active Publication Date: 2015-08-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then the sheet enters the stretching machine and is heated to 110-130°C. At this temperature, the water evaporates and micropores are formed in the sheet. These micropores will expand during the stretching process of the sheet, resulting in larger pores. Large pores, so that the porosity in the sheet increases, further reducing the density of the sheet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Firstly, the papermaking sludge filter cake with a water content of 69% was dried at 100°C, and then crushed into 1500 mesh powder; 20kg of high density polyethylene with a hot melt flow index MFI of 0.2, 80kg of 1500mesh papermaking sludge powder, Add 1.0kg of glycerol, 1.0kg of polyethylene glycol with an average molecular weight of 20,000, 0.5kg of stearic acid, and 0.2kg of antioxidant 1010 into the internal mixer, and stop the internal mixing until the temperature reaches 190°C ;The material after mixing is sent into the extruder, the extrusion temperature is controlled at 200°C, the extruded melt is sent into the calender through the T-shaped die, and rolled into sheets at a temperature of 150°C. The thickness of the sheet is 210μm, and the width is 800mm; the sheet from the calender is sent to -5°C cold water to cool to 5°C, and then the surface of the sheet is dried by a blower; then the sheet is sent to a multi-roll stretching machine In the stretching machine,...

Embodiment 2

[0020] Firstly, the papermaking sludge filter cake with a water content of 69% was dried at 120°C, and then crushed into 800-mesh powder; 25kg of high-density polyethylene with a hot melt flow index MFI of 0.1, 75kg of 800-mesh papermaking sludge powder, Add 0.5kg of glycerol, 0.5kg of polyethylene glycol with an average molecular weight of 3000, 1.0kg of stearic acid, and 0.05kg of antioxidant 1010 into the internal mixer, and stop the internal mixing until the temperature reaches 180°C ;The material after mixing is sent into the extruder, the extrusion temperature is controlled at 200°C, the extruded melt is sent into the calender through the T-die, and rolled into a sheet at a temperature of 160°C. The thickness of the sheet is 240μm, and the width is 800mm; the sheet from the calender is sent to -5°C cold water to cool to 4°C, and then the surface of the sheet is dried by a blower; then the sheet is sent to a multi-roll stretching machine In the stretching machine, the she...

Embodiment 3

[0022] Firstly, the papermaking sludge filter cake with a water content of 69% was dried at 110°C, and then crushed into 2500-mesh powder; 35kg of high-density polyethylene with a hot melt flow index MFI of 0.02, 65kg of 2500-mesh papermaking sludge powder, Add 0.2kg of glycerol, 0.3kg of polyethylene glycol with an average molecular weight of 6000, 0.3kg of stearic acid, and 0.3kg of antioxidant 1010 into the internal mixer, and stop the internal mixing until the temperature reaches 170°C ; The material after mixing is sent into the extruder, the extrusion temperature is controlled at 200°C, the extruded melt is sent into the calender through the T-shaped die, and rolled into sheets at a temperature of 140°C. The thickness of the sheet is 218μm, and the width is 800mm; the sheet from the calender is sent to -5°C cold water to cool to 0°C, and then the surface of the sheet is dried by a blower; then the sheet is sent to a multi-roll stretching machine In the stretching machine...

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Abstract

A calendaring preparation method for environment-friendly paper from paper mill sludge is characterized by comprising the following steps: drying paper mill sludge filter cakes at the temperature of 100-120 DEG C, then, crushing the paper mill sludge filter cakes into powder of 400 meshes or above; adding high density polyethylene, paper mill sludge powder, glycerine, polyethylene glycol, stearic acid and an antioxidant in parts by weight into an internal mixer, and internally mixing until the temperature reaches 170-190 DEG C; then, feeding the materials subjected to internal mixing into an extruder, feeding extruded melt into a calendar through a T-shaped die head, and calendaring the extruded melt into sheets at the temperature of 140-160 DEG C; feeding the sheets from the calendar into cold water to be cooled to be 5 DEG C or below, and blow-drying the surfaces of the sheets by a blower; feeding sheets with blow-dried surfaces into a multi-roller stretching machine, pre-heating the sheets to be 110-130 DEG C, and then stretching the sheets through 2-5 groups of rollers, so as to obtain the required environment-friendly paper.

Description

technical field [0001] The invention relates to a calendering preparation method of papermaking sludge environment-friendly paper. Background technique [0002] Papermaking is one of the four great inventions of our country and has made outstanding contributions to the progress of human civilization. The pulp and paper industry is also one of the pillars of our national economy. With the development of science and technology and the continuous improvement of production equipment, the quality and output of various papers have been greatly improved. According to the statistics of the national pulp and papermaking enterprises by the China Paper Association, there were more than 3,700 paper and paperboard enterprises in 2010, and the production volume of paper and paperboard was 92.7 million tons. At present, my country's paper production has surpassed that of the United States to become the world's number one. However, with the rapid development of the paper industry, the pap...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L71/02C08K13/08C08K11/00C08K5/053C08K5/09C08K5/134B29D7/01
CPCB29D7/01B29K2105/041B29K2995/0077C08K2201/005C08L23/06C08L2207/062C08L71/02C08K13/08C08K11/005C08K5/053C08K5/09C08K5/1345
Inventor 王彦华陈建定夏浙安章圣苗
Owner EAST CHINA UNIV OF SCI & TECH
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