SU1227759A1 - Fibreboard manufacturing process - Google Patents

Description

The invention relates to the woodworking industry, in particular, to a method for controlling the dispensing of a hardening additive (phenol-formaldehyde resin) in a continuous sizing machine in the manufacture of fiberboard (Fibreboard), and can be used in the manufacture of fibreboard.

 The purpose of the invention is to increase the efficiency of the process due to the reduction of resin consumption while maintaining the physical and mechanical properties of the plates.

The method is carried out as follows. .

The continuous sizing box enters the wood fiber mass (FEM) from the massive pool, which in turn, FIB comes from the refinator, the circulating mass basin of the circulating water basin and from the uninterrupted sizing box during the overflow. The content of phenol in DVM is measured using the FSV-65B instrument before feeding it into the continuous sizing box, which is in this case (C 0.5 mg / l).

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C is the concentration of phenol in the initial phenol-formaldehyde resin, mg / l;

The flow rate of the air flow meter supplied to the in; infrared continuous sizing is determined from the pumping capacity Q ,,, 2000 l / min.

SFL-3014 phenol-formaldehyde resin is fed to the sizing box of continuous sizing in the ratio. 1.2% of the absolute dry weight of the fiber, 35 is determined by the amount of phenol, which was deposited according to the technology for T-400 plates with a content of 70% of foliage in the wood raw material.

At a DVM concentration of 1.5%, the absolutely dry mass of the fiber was At constant known DVM consumption and medium acidity (pH) according to the balance indicated in (1),

go.on fiber.

Q, o, 5-2000 + 432-1,5-950 7 mg / mi

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The strength of the plate is 400 kg / cm.

em 1.5% of Q, which is equal to 1.5-2000 l / min / 100 "30 l / min.

Thus, the flow of resin Q, equal to 30 l / min-1.2% 0.36 l / min.

l ets 400 kg / cm.

In the work process, the concentration of phenol in the mass in front of the shchi

v

This flow rate is maintained and measured by 5 lump of continuous sizing (C) and

the concentrations of phenol in the water removed with the water at low tide vary during the shift and are: C 1 mg / l; C 2.5 mg / l. Depending on

using a flow meter. The content of free phenol is 0.1% of Q at a resin density of 2 g / cm.

The amount of phenol supplied to the crate continuous sizing

F

Ss. Q

0.1% -0.36 l / min X 1.2 g / cm.10 cm / l 0.432 g / min 432 mg / min

The glued DVM comes from a lamination on the ebb.

The water from the casting machine is determined by determining the concentration of phenol using FSV-65B (Cg 1.4 mg / l), while measuring the flow rate of this water by flow meter (Q 950 l / min).

The consumption of phenol deposited in the carpet is determined by the formula

 8lQC. + CQc., - s; Qg- (.1)

Where

Qg - consumption of phenol deposited in the carpet, mg / min;

С „- phenol concentration in

DVM arriving at the sizing stage, mg / l;

QM is the flow rate of DVM entering the sizing stage, l / min;

 - consumption of phenol-formaldehyde-. hydraulic resin, l / min;

Cg, is the concentration of phenol in

water removed at the stage of carpet ebb, mg / l;

Q is the flow rate of water removed at the stage of carpet pouring, l / min;

C is the concentration of phenol in the initial phenol-formaldehyde resin, mg / l;

determine the amount of phenol, settled at constant known consumption of WDS and acidity of the medium (pH) according to the balance indicated in dependence (1),

determined to oli

go.on fiber.

Q, o, 5-2000 + 432-1,5-950 7 mg / min

40

The strength of the plate is 400 kg / cm.

In the work process, the concentration of phenol in the mass in front of the sp

lump of continuous sizing (C „) and

lump of continuous sizing (C „) and

the concentrations of phenol in the water removed with the water at low tide vary during the shift and are: C 1 mg / l; C 2.5 mg / l. From dependence (1), the consumption of phenol in the resin is determined under the condition that the amount of phenol deposited on the fiber, Qg 7 mg / min, ensures the required quality of the plates, which

is - qcfl 0,382 mg / min

Since free phenol accounts for 0.1% of the resin consumption from Q,

determine the consumption of resin required in the changed situation from

Co «Qc, 0.1 Q,: 1,2r / CM -1oW / n 0.382 mg / min

From here Qc .0.31 l / min.

Therefore, in the resin supply section, the resin consumption is set equal to the value obtained, which corresponds to a decrease in resin consumption by 0.05 l / min.

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12277594

The actions described above for determining the minimum required consumption of phenol-formaldehyde resin are repeated after 1 hour during a shift, thereby obtaining a reduction in resin consumption by 1%.

Thus, the invention makes it possible to reduce the consumption of expensive scarce resin, provided that the required quality of the plates is achieved and to reduce the pollution of wastewater with harmful chemicals, which is very important for solving environmental problems in the production of fiberboard.

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Claims (1)

METHOD FOR PRODUCING WOOD-FIBERBOARDS, including the preparation of wood-fiber pulp, gluing it using phenol-formaldehyde resin, casting a carpet with simultaneous removal of water, water supply to the pulp preparation stage, pressing, measuring the flow of pulp entering the sizing stage, and dosing the consumption of phenol-formaldehyde resin, taking into account the measured consumption of wood fiber, characterized in that, in order to increase the efficiency of the process by reducing consumption, see When preserving the physicomechanical parameters of the plates, they additionally measure the flow rate of water removed at the stage of carpet casting, the concentration of phenol in the wood pulp entering the sizing stage, the concentration of phenol in water removed at the stage of casting the carpet, and then determine the flow rate phenol deposited in the carpet according to the formula CE f Wed * 3? Q = C _m Q + C. Q -CO, where Q is the flow rate of phenol deposited bol in the carpet, mg / min; f C _m is the concentration of phenol in the wood pulp entering the sizing stage, mg / l; _ Q _M - consumption of wood-fiber - <g of the mass entering the sizing stage, l / min; Q _CM - consumption of phenol-formaldehyde resin, l / min; C. - the concentration of phenol in the water removed at the low tide stage of the carpet, mg / l; Q & is the flow rate of water removed at the stage of carpet casting, _ψ l / min; С „is the phenol concentration in the initial phenol-formaldehyde resin, mg / l, and the phenol-formaldehyde consumption of the hydro-resin is dosed taking into account the measured consumption of wood pulp and adjusted for the consumption of phenol deposited in the carpet. SU ..... 1227759