Method for manufacturing formaldehyde-free plant fiber packaging material

A plant fiber and manufacturing method technology, applied in fiber raw material processing, fiber board, raw material separation and other directions, can solve the problems of waste of resources and low utilization value, and achieve the effect of improving internal bonding strength

Inactive Publication Date: 2011-12-07
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment of enzymatic lignin is only burned as fuel, and the utilization value is very low, resulting in a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using fast-growing poplar as raw material, it is processed into wood chips with a length of 20mm, a width of 10mm, and a thickness of 3mm, and the moisture content is controlled at 80%. The enzymatic lignin is crushed into 60-mesh granules, and the moisture content is controlled at 10%. The enzymatic lignin whose absolute dry weight accounts for 30% of the weight of the absolute dry poplar wood chips and the poplar wood chips are placed in a mixer and uniformly mixed. Put the mixed material into a steam explosion processor, pass through steam for pretreatment, the steam pressure is 1.3MPa, and the treatment time is 10min. Then suddenly open the valve to discharge, so that the poplar wood chips are dissociated into fiber bundles. The blasted fiber bundles are placed in a normal temperature mill for fine grinding treatment, and the treatment time is 3 minutes. The finely ground fibers are dried to a water content of 10%, then paved and shaped, and pre-pressed to obtain ...

Embodiment 2

[0019] Cotton stalks are used as raw materials, and processed into units with a length of 30mm, a width of 5mm, and a thickness of 2mm, and the moisture content is controlled at 80%. The enzymatic lignin is pulverized into 70-mesh particles, and the moisture content is controlled at 12%. The enzymatic lignin whose absolute dry weight accounts for 40% of the absolute dry cotton stalk unit weight is placed in a mixer and uniformly mixed with the cotton stalk unit. Put the mixed material into a steam explosion processor, pass through steam for pretreatment, the steam pressure is 1.1MPa, and the treatment time is 7min. Then suddenly open the valve to discharge, so that the cotton stalks are dissociated into fiber bundles. The blasted fiber bundles are placed in a room temperature mill for fine grinding treatment, and the treatment time is 2 minutes. The finely ground fibers are dried to a water content of 15%, then paved and formed, and pre-pressed to obtain a slab. Place the s...

Embodiment 3

[0021] Using straw as raw material, it is processed into a unit with a length of 50mm, a width of 5mm and a thickness of 1mm, and the moisture content is controlled at 80%. The enzymatic lignin is crushed into 80-mesh granules, and the moisture content is controlled at 15%. Put the enzymatic lignin whose dry weight accounts for 50% of the weight of dry poplar wood chips and the rice straw unit in a mixer and mix evenly. Put the mixed material into a steam explosion processor, pass through steam for pretreatment, the steam pressure is 0.8MPa, and the treatment time is 3min. Then suddenly open the valve to discharge, so that the straw is dissociated into fiber bundles. The blasted fiber bundles are placed in a room temperature mill for fine grinding treatment, and the treatment time is 1 min. The finely ground fibers are dried to a water content of 20%, and then paved and formed, and pre-pressed to obtain a slab. Place the slab in a hot press, and make it with a density of 1....

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Abstract

The invention relates to a method for manufacturing formaldehyde-free plant fiber packaging materials, and belongs to the technical field of wood composite material manufacturing. The technique is to firstly process the plant fiber raw material into a unit of a certain size, and evenly mix it with the enzymatic lignin whose dry weight accounts for 30-50% of the dry plant fiber unit weight. Then put the mixture into the steam explosion processor, explode and dissociate into fiber bundles under the condition of steam pressure of 0.8~1.3MPa and treatment time of 3~10min, and then separate them after fine grinding in a regular temperature mill for 1~3min Fibers are dried to a moisture content of 10-20%, and then paved and shaped. Under the conditions of temperature 190-210°C, pressure 4.0-5.0MPa, time 30-50s / mm, it is hot-pressed into a plate with a density of 0.9-1.2g / cm3 and a thickness of 2-4mm. This material does not contain free formaldehyde and any chemicals, and can be widely used in the food packaging industry.

Description

technical field [0001] The invention relates to a method for manufacturing food packaging materials without free formaldehyde by using enzymatically hydrolyzed lignin as raw materials of plant fibers and cellulose fuel ethanol processing residues. The invention belongs to the technical field of wood composite material manufacturing. Background technique [0002] At present, there are many kinds of food packaging materials on the market, including paper, bamboo, wood, metal, enamel, ceramics, plastic, rubber, natural fiber, chemical fiber, glass and other products. Among them, products made of natural plant fibers (including wood, bamboo and crop straw, etc.) have attracted much attention because of their renewability of resources and degradability of products. The ultra-thin plant fiber composite material made of plant fiber as raw material and synthetic resin glue as adhesive has been widely used in food packaging, such as tea, moon cake, pastry and other packaging boxes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21J1/00D21B1/04D21C1/02D21C5/00D21D1/20
Inventor 周晓燕张伟东吕城龙勇强周定国罗海力梅长彤潘明珠徐勇唐苾君刘学源洪枢李胜楠李俊
Owner NANJING FORESTRY UNIV
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