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Manufacturing method of high density fiberboard for whitened type E1 grade floor substrate

A technology of high-density fiberboard and manufacturing method, which is applied in the direction of applications, household components, flat products, etc., can solve the problems of physical and mechanical properties, durability and water resistance, resin water solubility, and curing time prolongation, etc., to achieve good visual effects , small drying load, clear color effect

Inactive Publication Date: 2012-04-11
DARE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to relevant literature reports, the formaldehyde emission of wood-based panels has a parabolic or linear relationship with the F / U molar ratio of the urea-formaldehyde resin used. When the resin F / U molar ratio is 1.2-1.4, the formaldehyde emission and performance of wood-based panels can be considered. As the F / U molar ratio further decreases, the water solubility of the resin decreases, the storage period shortens, the curing time prolongs, and the physical and mechanical properties, durability and water resistance of the product all decrease. The pure urea-formaldehyde resin F / U mole It is the limit to reduce the ratio to 1.05. At this time, the formaldehyde emission of HDF is 12-15mg / 100g, but the molar ratio should be below 0.98 when producing E1 grade HDF, so the urea-formaldehyde resin must be modified

Method used

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  • Manufacturing method of high density fiberboard for whitened type E1 grade floor substrate
  • Manufacturing method of high density fiberboard for whitened type E1 grade floor substrate
  • Manufacturing method of high density fiberboard for whitened type E1 grade floor substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The manufacturing process of high-density fiberboard for whitening type E1 floor base material, the manufacturing steps are:

[0028] 1. Chipping and screening of wood (ashing): the fresh poplar trees that have been placed for 8 days are chipped into wood chips of uniform size. After the chips are uniform, they are placed in the outdoor storage yard to ferment for 10 days. , bark and other debris, and then through two high-power fans, the wind blows the wood chips to the waterfall, and removes dust, leaves, plastic paper and silt and other sundries and garbage;

[0029] 2. Pre-cooking and cooking: pre-cook the chipped and screened wood chips with saturated steam and hot water for 3.5 minutes, the pre-cooking temperature is 80°C, and extrude a large amount of wood extracts after being extruded by a cork screw Squeeze the water out of dark yellow color, then cook for 3 minutes, the cooking temperature is 180°C, and the cooking pressure is 7.8bar;

[0030] 3. Fiber separa...

Embodiment 2-6

[0047] The steps of Embodiment 2-6 are the same as that of Embodiment 1, except that the addition ratio of each composition is shown in the following list:

[0048] Table 1 is the parameters of the precooking and cooking steps in Examples 2 to 6.

[0049]

[0050] Table 2 is the parameter of each component percentage in the preparation step of curing agent in embodiment 2 to embodiment 6.

[0051]

[0052] The timber situation list that table 3 embodiment 2-6 adopts:

[0053] Example 2

Embodiment 7

[0055] Take the product obtained in Example 1, and adopt the national standard coating 4-cup detection process: first adjust the horizontal position of the coating 4 cup, press the lower outlet with the left index finger, and then inject urea-formaldehyde glue with a temperature of 25°C into the cup, Scrape off the urea-formaldehyde glue that is higher than the mouth of the cup with a glass rod. While releasing the left index finger, press the stopwatch on the right hand for timing. When the urea-formaldehyde glue flows from the 4 cups, press the stopwatch at the same time to record the stopwatch The reading is repeated twice, and the average value is taken, and this value is the viscosity of the urea-formaldehyde glue.

[0056] figure 1 is the thermocompression curve, figure 2 A screenshot of the experimental results of the cross-sectional density distribution. according to figure 1 , figure 2 The display mutual combination comparative analysis shows:

[0057] attached...

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Abstract

The invention relates to a manufacturing method of a high density fiberboard for a whitened type E1 grade floor substrate, which comprises the steps of wood chipping and screening, pre-stewing and stewing, defibrator process for causing fiber separation, concoction of E1 grade urea formaldehyde resin glue, curing agent preparation, the application of urea-formaldehyde glue, curing agents and paraffins, drying, paving, hot pressing, cooling and tempering, and sanding and saw cutting, and is characterized in that woods are selected from major diameter cottonwoods with diameters larger than 8cm, are evenly chipped and are then placed in an outdoor storage yard to be fermented for 5 to 15 days; in the concoction process of the E1 grade urea formaldehyde resin glue, urea is added at 5 times; and the curing agents are formed by preparing phosphoric acid accounting for 3 to 5 percent of the total content, urotropin accounting for 1 to 3 percent of the total content, triethanolamine accounting for 1 to 3 percent of the total content, and ammonium sulfate accounting for 19 to 21 percent of the total content. The obtained whitened type E1 grade floor substrate has the advantages of little surface impurity, fine and smooth fiber, white color, good visual effect, reasonable density distribution and moderate intensity, and is frequently used for producing top grade indoor laminate flooring and composite floors.

Description

technical field [0001] The invention relates to the technical field of wood-based panel production, in particular to a method for manufacturing a high-density fiberboard for whitening E-grade 1 floor substrates with delicate surface fibers, light color and low formaldehyde emission. Background technique [0002] The density of medium density fiberboard (MDF) is generally 0.45-0.88g / cm3, and the MDF used for laminate flooring substrates in the range of 0.85-0.95g / cm3 is usually called high-density fiberboard, and the base material is composed of laminate flooring. The main body, in actual use, plays an important role in tenon-and-groove connection, stable shape, and load bearing. The performance of the base material directly affects the weight of the final product. Therefore, the quality requirements for the HDF of the laminate flooring base material, in addition to In addition to its density, moisture content, surface bonding strength, internal bonding strength, static bendi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/08
Inventor 闻文丁功庆朱伟平
Owner DARE TECH
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