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A manufacturing process and fiberboard technology, which is applied in the field of ultra-light fiberboard manufacturing technology, to achieve the effects of broadening the source of raw materials, alleviating the contradiction between supply and demand, and improving comprehensive utilization and added value
Active Publication Date: 2012-12-05
DAYA WOOD IND JIANGXI +1
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Problems solved by technology
Since the 1990s, the industrial production of medium density fiberboard (MDF) has made great progress, and the development of new technology and new technology has also promoted the development and application of new MDF products; especially in recent years, high-density fiberboard for flooring has been developed successively. board and MDF boards with functions such as fla
Method used
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Embodiment 1
[0025] 1. Preparation of melamine-modified urea-formaldehyde resin adhesive
[0026] The preparation process is as follows:
[0027] (1), add formaldehyde accounting for 55% of the mass ratio of the melamine-modified urea-formaldehyde resin adhesive in the reaction kettle, and adjust the pH to 8.8-9.2 with a 40% mass percentage concentration of sodium hydroxide solution;
[0028] (2) Put in the first batch of melamine and the first batch of urea, gradually raise the temperature to 88-90°C, and react for 20 minutes.
[0029] (3) Control the molar ratio of formaldehyde to urea at 1.9-2.2, react at 85-90°C for 80 minutes, adjust the pH to 5.0-6.0 with formic acid with a mass percentage concentration of 20%, and react until the viscosity is 18-19s;
[0030] (4), add the second batch of urea and the second batch of melamine, the molar ratio of formaldehyde to the sum of urea and melamine is 1.30-1.45, and react at 78-88°C for 25-35min;
[0031] (5) Add the third batch of urea so ...
Embodiment 2
[0036] 1. Preparation of melamine-modified urea-formaldehyde resin adhesive
[0037] The preparation process is as follows:
[0038] (1), add formaldehyde in the reaction kettle, add 40% sodium hydroxide solution in mass percentage concentration to adjust the pH to 8.8-9.2;
[0039] (2) Put in the first batch of melamine and the first batch of urea, gradually raise the temperature to 88-90°C, and react for 20 minutes.
[0040] (3), the molar ratio is controlled at 1.9-2.2, react at 85-90°C, add formic acid to adjust the pH to 5.0-6.0, and react until the viscosity is 18-19s;
[0041] (4), add the second batch of urea and the second batch of melamine, the molar ratio of formaldehyde to the sum of urea and melamine is 1.30-1.45, react at 78-88°C for 25-35min;
[0042] (5) Add the third batch of urea so that the molar ratio of formaldehyde to the sum of urea and melamine is 0.8-0.95, keep warm at 70-80°C for 20-30min, gradually cool down to 40°C, add sodium hydroxide solution t...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract
The invention discloses a manufacturing process for an ultra light fiber board. The method comprises the following steps of: peeling wood, cutting to obtain sheets, screening, washing, boiling, separating fibers, mixing and applying adhesive, drying and sorting, paving and forming, prepressing, performing hot-pressing, turning the board and cooling, sanding, inspecting and classifying, and packaging and putting in storage, wherein in the boiling step, the boiling material level is 1.6 to 3m, and the boiling temperature is 165 to 175 DEG C; in the step of separating the fibers, the wood sheets enter a mill through a ribbon spiral conveyor, molten waxes are fed into the mill simultaneously, the application amount is 5.0 to 7.0kg/m<3>, and the gap of an abrasive wheel is 0 to 4mm; and in the step of mixing and applying the adhesive, melamine modified urea resin adhesive is applied, the adhesive application amount is 195 to 210kg/m<3>, the adding amount of a curing agent is 1 to 2.5 percent based on the mass of absolute drying adhesive, and the curing agent is a mixture of ammonium chloride and a (commercially available) HA101 cross-linking agent in a mass ratio of 3:1. Moreover, a method for preparing the melamine modified urea resin adhesive used by manufacturing the ultra light fiber board is correspondingly provided for matching the manufacturing process.
Description
technical field [0001] The invention belongs to the field of man-made fiberboard manufacturing, and in particular relates to a manufacturing process of an ultra-light fiberboard. Background technique [0002] my country's medium density fiberboard (MDF) industry began to develop in the early 1980s, because of its moderate density (0.7~0.8 g / cm 3 ), superior performance, widely used in audio equipment, indoor and outdoor decoration, etc., occupies an important position in the wood-based panel industry. Since the invention of MDF, it has been widely used in the fields of furniture, interior decoration, construction, packaging, musical instruments, vehicles and shipbuilding due to its dense and uniform texture and excellent machining performance. With the development of MDF production equipment and production technology With the continuous development, its scope of use is becoming wider and wider. Replacing stainless steel or plastic with density fiberboard for double-sided d...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information
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