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Method for manufacturing weed wood and straw compounding medium density fiberboard with laminated structure

A layered structure and manufacturing method technology, applied in the field of miscellaneous wood/straw composite medium density fiberboard manufacturing technology, can solve the problems of high hygroscopicity and low bonding strength, etc., to reduce hygroscopicity, improve bonding strength, and save wood resources Effect

Inactive Publication Date: 2010-03-03
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the modification of straw or the improvement of technology, the physical and mechanical properties of straw particleboard and straw fiberboard have been improved. However, the high moisture absorption and low bonding strength of straw particleboard and fiberboard have always been the bottleneck hindering the promotion and use of such materials. one

Method used

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  • Method for manufacturing weed wood and straw compounding medium density fiberboard with laminated structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1, the miscellaneous wood is made into chips of 25-35mm by a chipper, and sent to a screw feeder for steam preheating. The temperature is 120 ° C and the retention time is 5 minutes. After preheating, it is passed into the internal steam of the thermal mill The pressure is 0.8MPa for fiber separation, apply 10% urea-formaldehyde resin glue, 1.0% paraffin emulsion, and dry; the straw is made into 20-40mm fragments through the pulverizer, and sent to the screw feeder for steam preheating, the temperature is 90 ° C, The retention time is 5 minutes. After preheating, it is passed into a thermal grinder with an internal steam pressure of 0.6 MPa for fiber separation. Apply 0.8% isocyanate glue and 12% urea-formaldehyde resin glue and dry. The dried wood fiber and grass fiber are laminated, pre-pressed, and hot-pressed in the order of surface layer-core layer-surface layer in the thickness direction of the slab with grass fiber: wood fiber: grass fiber = 20:60:20 and ...

Embodiment 2

[0012] Embodiment 2, in the separation, sizing and waterproofing agent, drying process of straw fiber and miscellaneous wood fiber, similar to embodiment 1, the difference is that the wood fiber and grass fiber that have been dried are arranged according to the surface layer in the thickness direction of the slab. -The sequence of core layer-surface layer is wood fiber:grass fiber:wood fiber=20:60:20 for lamination, pre-pressing, hot pressing and post-treatment to produce boards. The performance of the product is shown in Table 2.

[0013] Table 2 is measured by the performance of the sheet material prepared by example 2

[0014] test performance

Embodiment 3

[0015] Example 3, miscellaneous wood is made into chips of 25-35 mm by a wood chipper, sent to a screw feeder for steam preheating, the temperature is 150 ° C, and the retention time is 3 minutes. After preheating, it is passed into the internal heat mill Steam pressure 1.0MPa for fiber separation, apply 11% urea-formaldehyde resin glue, 0.8% paraffin emulsion, and dry; the straw is made into 20-40mm fragments through a pulverizer, and sent to a screw feeder for steam preheating at a temperature of 120°C , The retention time is 3min, and the internal steam pressure of 0.8MPa is passed into the thermal refiner for fiber separation, 1.0% of isocyanate glue and 11% of urea-formaldehyde resin glue are applied, and dried. The dried wood fiber and grass fiber are laminated, pre-pressed, and hot-pressed in the order of surface-core-surface in the thickness direction of the slab with grass fiber: wood fiber: grass fiber = 25:50:25 and post-processing to produce panels. The performanc...

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Abstract

The invention relates to a method for manufacturing a weed wood and straw compounding medium density fiberboard with a laminated structure. The method adopts straw and weed wood as raw materials, andincludes the following steps: the straw and the weed wood are respectively processed by defibration, and urea formaldehyde resin adhesive and waterproof agent are added, and in the process of formation, straw fibres and wood fibres are proportionally assembled and laminated in the direction of thickness and then are processed by thermocompression to form boards. The method has the advantages thatproved by performance tests, the flexural modulus, the strength and the internal bonding strength of the medium density fiberboard, compared with a pure straw medium density fiberboard, are respectively and obviously increased under the same condition, and the expansion rate of water-absorbing thickness and the water absorption rate are lowered; and the relative performances of the compound material can be increased by changing the mode of lamination. The method efficiently and comprehensively utilizes the agricultural straws and saves wood resources, thereby protecting the ecological environment. The product can be applied to the occasions of furniture manufacturing and production, base materials for interior decoration, and the like.

Description

technical field [0001] The invention belongs to the technical field of wood-based panels and composite materials, and relates to a manufacturing process of a layered wood / straw composite medium density fiberboard. Background technique [0002] With the construction of a resource-saving and environment-friendly society in our country, the utilization of crop straw resources has been paid more and more attention, and the development prospects of the crop straw industry will become wider and wider. The straw-based panel industry is considered to be one of the main ways to consume a large amount of crop straw. Among the many straw-based panel products, straw particleboard and straw fiberboard are the two main types of products developed. Through the modification of straw or the improvement of technology, the physical and mechanical properties of straw particleboard and straw fiberboard have been improved. However, the high moisture absorption and low bonding strength of straw pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/04B27N1/00B27N1/02B27N3/10
Inventor 潘明珠周晓燕周定国施登军汤丽娟郑菲李华冠吕城龙
Owner NANJING FORESTRY UNIV
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