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Method for manufacturing medium density fiberboard with enzyme-activated fiber

A technology of fiberboard and medium density, which is applied in the direction of manufacturing tools, flat products, and pretreatment of molding materials. It can solve the problems of large water consumption, insufficient internal bonding strength, and low activation efficiency, so as to reduce water consumption and facilitate industrial production. , the effect of reducing processing time

Inactive Publication Date: 2012-05-09
RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Someone proposes to adopt phenol oxidase to process fiber to produce fiberboard (referring to US 5505772, Zhu Jiaqi, 2004, (4) " Forestry Science "), its technique is to add the wood fiber of substrate concentration 5% in the enzyme liquid of setting enzymatic activity, Introduce oxygen and treat at 26°C for 2 hours, take it out and drain it, cold press the preform and squeeze water, then hot press to prepare the density over 1.0g / cm 3 High-density fiberboard, this kind of fiberboard does not use adhesives, and there is no free formaldehyde release pollution, but the activation efficiency is low. In order to achieve the predetermined enzyme activation effect, the fiber needs to be soaked in the enzyme solution for 2 hours or longer. Water consumption Big
In addition, the fiberboards produced by the above process are all high-density fiberboards. If the density is lower than 0.83g / cm 3 , the internal bonding strength is less than 0.1MPa

Method used

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  • Method for manufacturing medium density fiberboard with enzyme-activated fiber
  • Method for manufacturing medium density fiberboard with enzyme-activated fiber

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Experimental program
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Effect test

Embodiment 1

[0015] (1) Enzyme solution preparation: Laccase (Laccase EC 1.10.3.2) with an amount of 30U / (g dry fiber) was added to acetic acid / sodium acetate buffer solution with a pH of 5.0 and mixed evenly, and the quality of the buffer was controlled so that all the enzyme solution was added The moisture content of poplar fiber is 55%, and the target density of fiberboard is 0.80g / cm 3 , The plate thickness is 3mm. The enzyme used is laccase Novo Nordisk A / S, Novozym51003 (EC 1.10.3.2), and the substrate used when measuring laccase activity is the ethanol solution of syringaldazine (syringaldazine), and the specific activity of the laccase enzyme solution used in the test is 3U / ml, an enzyme activity unit (U) refers to the amount of enzyme required to catalyze the conversion of 1 μmol of syringaldazine into a product per minute under certain reaction conditions;

[0016] (2) Enzyme-activated fiber: the poplar is dried to a moisture content of 10% after slicing, washing, heat grinding,...

Embodiment 2

[0020] (1) Enzyme solution preparation: Laccase (Novozym 51003) with an amount of 30U / (g dry fiber) was added to acetic acid / sodium acetate buffer solution with a pH of 4.5 and mixed evenly. The moisture content of the fiber is 50%, and the target density of the fiberboard is 0.85g / cm 3 , the plate thickness is 3mm, and the specific activity of the laccase enzyme solution used in the test is 3U / ml;

[0021] (2) Enzyme-activated fiber: the poplar is dried to a moisture content of 10% after slicing, washing, heat grinding, and fiber separation to obtain poplar fiber; the prepared enzyme solution is sprayed on the poplar fiber by a glue mixer, and then the fiber is Transfer to ventilation and drying equipment for activation treatment at 55°C and dry the fiber for 60 minutes, so that the moisture content of the fiber is 13-16%;

[0022] (3) Hot pressing: manual paving, using a hot pressing process with a temperature of 200°C, a time of 90 s / mm, and a hot pressing pressure of 2.5 ...

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Abstract

The present invention discloses a method for manufacturing medium density fiberboard with enzyme-activated fiber. The invention is characterized in that the phenoloxidase is added into the acetate / sodium acetate buffering solution for mixing to uniform and preparing the enzyme liquid. The using amount of buffering solution is controlled so that the water ratio of fiber is 50%-60% when the enzyme liquid is totally added into the fiber. The enzyme liquid is totally sprayed into the fiber. Then the fiber is taken into a drying device for activating. The air is introduced in the activating process. When the water ratio of fiber is 10-18%, artificial pavement is executed for obtaining the medium density fiberboard with the density of 0.75-0.84g / cm<3>. The method of the invention has the advantages of simple process, adoption of a mode that the enzyme liquid is directly and uniformly sprayed on the fiber surface, greatly reduced water consumption, simultaneously executing of activating and drying of fiber, increased enzyme activation temperature, shortened processing time, no step of cold pressing water squeezing and facility for industrial production. As no synthetic resin adhesive is added, the obtained product does not have the pollution of free formaldehyde.

Description

technical field [0001] The invention relates to a method for manufacturing medium-density fiberboards from enzyme-activated fibers, which uses enzyme-activated wood fibers to manufacture glue-free medium-density fiberboards, and belongs to the field of wood science and technology. Background technique [0002] At present, adhesives are basically used in wood-based panel products such as MDF and particle boards prepared in the wood industry. The adhesives are mainly composed of formaldehyde-based synthetic resins. The wood composite materials prepared by such adhesives have the advantages of high strength and good durability. However, due to the use of formaldehyde-based resin adhesives such as urea-formaldehyde resins, phenolic resins, and melamine resins, especially urea-formaldehyde resins, the wood-based panel products prepared by gluing them release free formaldehyde, which pollutes the indoor environment. [0003] In the natural growth process of wood, phenol oxidase ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/04B27N1/00B27N3/08B27N3/18C12P1/00
Inventor 李家宁段新芳曹远林郭康权周冠武
Owner RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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