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Processing technique of medium density fiber plate suitable for routing board

A manufacturing process, fiberboard technology, applied in the field of medium density fiberboard manufacturing process, can solve the problems of unreasonable density distribution, high formaldehyde emission, low board strength, etc., to reduce pre-curing time, stable mechanical properties, and reduce formaldehyde emission Effect

Active Publication Date: 2010-06-02
DARE WOOD BASED PANEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, MDF was often not suitable for engraving and milling due to reasons such as unreasonable density distribution, low or high strength of the board, and high formaldehyde emission.

Method used

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  • Processing technique of medium density fiber plate suitable for routing board
  • Processing technique of medium density fiber plate suitable for routing board
  • Processing technique of medium density fiber plate suitable for routing board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A medium-density fiberboard manufacturing process suitable for milling board processing. The processing steps are: wood chipping and screening: chipping tree species with similar specific gravity into wood chips of uniform size; pre-cooking and cooking: chipping The wood chips were precooked with saturated steam for 3 minutes, the precooking temperature was 90 ° C, and then steamed for 3 minutes, the cooking temperature was 165 ° C; fiber separation: the cooked wood chips were defibrated by a thermal mill, and the obtained wood fibers were ≥36 mesh accounts for 10% of the total fiber weight, and ≤200 mesh accounts for 5% of the total fiber weight; preparation of E1 grade urea-formaldehyde glue: After heating the formaldehyde in the container to 30°C, add NaOH with a mass concentration of 30% to adjust the pH value 8.5; add the first batch of urea, the addition amount is 35% of the mass of formaldehyde, stir until the temperature is balanced, adjust the pH value to 8.3~8....

Embodiment 2

[0016] A medium-density fiberboard manufacturing process suitable for milling board processing. The processing steps are: wood chipping and screening: chipping tree species with similar specific gravity into wood chips of uniform size; pre-cooking and cooking: chipping The wood chips were precooked with saturated steam for 5 minutes, the precooking temperature was 100°C, and then cooked for 5 minutes, the cooking temperature was 175°C; fiber separation: the cooked wood chips were defiberized by a heat mill, and the obtained wood fibers were ≥36 mesh accounts for 20% of the total fiber weight, and ≤200 mesh accounts for 10% of the total fiber weight; preparation of E1 grade urea-formaldehyde glue: After heating the formaldehyde in the container to 35°C, add NaOH with a mass concentration of 30% to adjust the pH value 8.8; add the first batch of urea, the addition amount is 35% of the mass of formaldehyde, stir until the temperature is balanced, adjust the pH value to 8.5; heat u...

Embodiment 3

[0018] A medium-density fiberboard manufacturing process suitable for milling board processing. The processing steps are: wood chipping and screening: chipping tree species with similar specific gravity into wood chips of uniform size; pre-cooking and cooking: chipping The wood chips were precooked with saturated steam for 4 minutes, the precooking temperature was 95 ° C, and then steamed for 4 minutes, the cooking temperature was 170 ° C; fiber separation: the cooked wood chips were defiberized by a thermal mill, and the obtained wood fibers were ≥36 mesh accounts for 15% of the total fiber weight, and ≤200 mesh accounts for 8% of the total fiber weight; preparation of E1 grade urea-formaldehyde glue: After heating the formaldehyde in the container to 33°C, add NaOH with a mass concentration of 30% to adjust the pH value 8.7; add the first batch of urea, the addition amount is 35% of the formaldehyde mass, stir until the temperature is balanced, adjust the pH value to 8.4; hea...

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Abstract

The invention provides a processing technology for a routing plate, comprising the processing steps as follows: chipping and selecting of wood, pre-steaming and steaming, fiber separation, preparing the E1-class urea-formaldehyde, preparing the curing agent, adding the urea-formaldehyde, curing agent and paraffin, drying the fiber of the added the urea-formaldehyde, curing agent and paraffin, uniformly paving the dried wood fiber and smoothly pre-pressing the wood fiber under the pressure of 3.0-5.0MPa, heat pressing under the temperature of 180-185 DEG C, cooling, quenching and tempering, sanding and sawing, classifying and packaging. The plate prepared by the process has reasonably distributed density, moderate strength and low release quantity of formaldehyde.

Description

1. Technical field [0001] The invention belongs to the field of wood-based panel processing, and in particular relates to a medium-density fiberboard manufacturing process suitable for milling panel processing. 2. Background technology [0002] Existing technology: In recent years, my country's wood-based panels have achieved great development, and in 2006 it has exceeded 70 million m 3 , the market competition is very severe; with the increasing awareness of the environment, health and life, people pay more and more attention to functional green wood-based panel products. In order to adapt to this development trend, further tap the potential of the enterprise, and create greater profits, our company has developed a functional E1 grade MDF suitable for engraving and milling, and put it into mass production. In the past, MDF was often not suitable for engraving and milling because of unreasonable density distribution, low or high strength of the board, and high formaldehyde ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N1/02B27N3/04D21B1/14C09J161/24
Inventor 金岭朱丽军闻文高宏伟
Owner DARE WOOD BASED PANEL GRP