CN104647558A - Manufacturing method of environment friendly flame retardant medium density fiber board - Google Patents

Abstract

The invention discloses a manufacturing method of an environment friendly flame retardant medium density fiber board. The manufacturing method relates to the technology field of chemical engineering, and comprises the following manufacturing steps of debarking and chipping wood, and sieving to obtain qualified wood chips; boiling at high temperature and high pressure, and separating fiber to obtain qualified fiber; applying adhesive, dye and curing agent; drying, winnowing, and applying powder flame retardant for spreading forming; finally, pressing to obtain rough boards through a pressing machine, cooling, sanding and saw cutting to obtain qualified production boards. The manufacturing method of the environment friendly flame retardant medium density fiber board provided by the invention can solve the problems that the usage amount of the flame retardant is large and the production cost is high during the flame retardant medium density fiber board manufacturing process.

Description

A kind of manufacture method of environmental-protection flame-retardant medium density fibre board (MDF)

Technical field

The present invention relates to chemical technology field, especially a kind of manufacture method of environmental-protection flame-retardant medium density fibre board (MDF).

Background technology

The manufacture method of existing a kind of medium and high density fibre panel be woodchip is carried out boiling softening after, logical

Cross screw unloading control system fixing quantity and enter the defibrator process of defibrator high speed, the flame-retardant mixture be made up of urea, oligophosphate, boratory mixed solution, under the condition higher than defibrator pressure, sprayed in the mill room of defibrator by measuring pump, eject mill room after wood-fibred is mixed with flame-retardant mixture and enter applying glue pipeline, in applying glue pipeline, spray into melamine modified urea-formaldehyde resin adhesive and emulsion paraffin water repellent and fibers mixture, fiber drying, mat formation, make medium and high density fibre panel after hot pressing.

Prior art all needs drying system by moisture drying when producing, significantly increase the pressure of drying system, the dry energy of fibreboard production line comes from the heat of Energy plant combustion fuel generation, and be subject to the production capacity restriction of Energy plant dry flue gas, therefore, use aqueous fire retardant by a large amount of fuel cost of increase and restrict production line production capacity.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of manufacture method of environmental-protection flame-retardant medium density fibre board (MDF), and its concrete scheme is as follows:

A manufacture method for environmental-protection flame-retardant medium density fibre board (MDF), comprises the steps: (1) wood raw material peeling: first wood raw material is put into peeling machine and carry out peeling, after peeling, the content of bark of wood raw material is≤3%; (2) chip: chipped by the wood raw material after the peeling of step (1) gained by wood chipping equipment, obtaining long is 30-35 millimeter, and wide is 20-25 millimeter, and thick is the wood chip of 4 millimeters; (3) wash: the wood chip cut is processed by washing, the impurity on wood chip is cleaned; (4) boiling is softened: the wood chip of wash clean is put into the boiling of boiling cylinder, boiling temperature: 165-175 DEG C, cooking pressure: 8 bar, the time: 2 minutes; (5) defibrator process: mill room defibrator process put into by wood chip boiling softened, mill chamber pressure 8. 0-9. 0 bar, temperature 165-180 DEG C, wood chip is separated into fiber by mill room; (6) applying glue, waterproof material, dyestuff: sizing agent applied amount is the 15-18% of dry fiber; Waterproofing agent applied amount is the 0.9-1.1% of dry fiber quality; Dying agent applied amount is orchil: 1.0-1.2 kg/m ³, black dyes: 6-7kg/m ³; (7) dry: the wet fiber of step (6) gained to be entered drying duct and carries out drying, dry inlet temperature 135-140 DEG C, dry outlet temperature 55-65 DEG C; (8) selection by winnowing negative pressure :-1-7 handkerchief; (9) fire retardant is applied: utilize feed auger that fire retardant is added the conveyance conduit after fibre storehouse, in the duct with suspension fiber Homogeneous phase mixing, fire retardant addition is B level flame-retardant board: 100-120kg/ m3; C level flame-retardant board: 50-60 kg/ m ³; (10) to mat formation hot pressing: sheet material after shaping, the hot pressing of mating formation, density 760-880kg/m3, sheet material moisture content: 4-7%, the hot pressing factor: 7.0-8.0mm/s;

(11) sheet material cooling 156-166 hour; (12) sanding cutting edge: through abrasive finishing machine abrasive finishing and sawing becomes stock board after sheet material cooling; (13) pack: the stock board after sawing is identified on request, packs.

Owing to adopting technique scheme, the present invention has following beneficial effect:

1, solid flame retardant because of different flame-retardancy requirements applied amount be 50-120kg/ m ³, applied amount is few, store convenient transportation and expense low;

2, solid flame retardant does not need to increase drying capacity, does not increase added burden to production line production capacity.

Detailed description of the invention

By embodiment, the present invention is described in further detail below:

embodiment 1:

(1), raw material peeling: wood raw material is mainly the fast-growing eucalyptus of the wild oak in Guangxi, artificial growth, these wood raw materials is put into peeling machine and carries out peeling, and after peeling, content of bark is≤3%;

(2), to chip screening: by wood chipping equipment, the wood raw material after the peeling of step (1) gained is chipped, obtaining length is 32 millimeters, wide is 22 millimeters, thick is the wood chip of 4 millimeters, filter out simultaneously and be longer than 50 millimeters, the wood chip being shorter than 6 millimeters out, to ensure wood chip form stable;

(3), washing: because containing the impurity such as a large amount of silt, chad in wood chip, by washing process, avoid impurity damage mill;

(4), boiling is softened: the wood chip of wash clean is put into the boiling of boiling cylinder, boiling temperature: 170 DEG C, cooking pressure: 8 bar, digestion time: 2 minutes;

(5), defibrator process: mill room defibrator process put into by wood chip boiling softened, mill chamber pressure 8-9 bar, temperature 165-180 DEG C, and wood chip is separated into fiber by mill room;

(6), the E1 rank adhesive that solids content is 54% is applied: 200kg/m ³, waterproofing agent: 7kg/m3, orchil: 1kg/m ³;

(7), dry: one-level is dry, dry inlet temperature 136 DEG C, dry outlet temperature 60 DEG C;

(8), selection by winnowing negative pressure: 7 handkerchiefs;

(9), fire retardant is applied: utilize feed auger that fire retardant is added the conveyance conduit after fibre storehouse, in the duct with suspension fiber Homogeneous phase mixing, fire retardant addition is: C level flame-retardant board 50 kg/ m3;

(10), hot pressing of mating formation: sheet material after shaping, the hot pressing of mating formation, density 760 kg/m3, sheet material moisture content: 6%, the hot pressing factor: 7mm/s;

(11), sheet material cools 160 hours;

(12), sanding cutting edge: through abrasive finishing machine abrasive finishing and sawing becomes stock board after sheet material cooling;

(13), pack, the stock board after sawing is identified on request, packs, to obtain final product.

Claims (1)

1. a manufacture method for environmental-protection flame-retardant medium density fibre board (MDF), is characterized in that comprising the steps: (1) wood raw material peeling: first wood raw material is put into peeling machine and carry out peeling, after peeling, the content of bark of wood raw material is≤3%; (2) chip: chipped by the wood raw material after the peeling of step (1) gained by wood chipping equipment, obtaining long is 30-35 millimeter, and wide is 20-25 millimeter, and thick is the wood chip of 4 millimeters; (3) wash: the wood chip cut is processed by washing, the impurity on wood chip is cleaned; (4) boiling is softened: the wood chip of wash clean is put into the boiling of boiling cylinder, boiling temperature: 165-175 DEG C, cooking pressure: 8 bar, the time: 2 minutes; (5) defibrator process: mill room defibrator process put into by wood chip boiling softened, mill chamber pressure 8. 0-9. 0 bar, temperature 165-180 DEG C, wood chip is separated into fiber by mill room; (6) applying glue, waterproof material, dyestuff: sizing agent applied amount is the 15-18% of dry fiber; Waterproofing agent applied amount is the 0.9-1.1% of dry fiber quality; Dying agent applied amount is orchil: 1.0-1.2 kg/m ³, black dyes: 6-7kg/m ³; (7) dry: the wet fiber of step (6) gained to be entered drying duct and carries out drying, dry inlet temperature 135-140 DEG C, dry outlet temperature 55-65 DEG C; (8) selection by winnowing negative pressure :-1-7 handkerchief; (9) fire retardant is applied: utilize feed auger that fire retardant is added the conveyance conduit after fibre storehouse, in the duct with suspension fiber Homogeneous phase mixing, fire retardant addition is B level flame-retardant board: 100-120kg/ m3; C level flame-retardant board: 50-60 kg/ m ³; (10) to mat formation hot pressing: sheet material after shaping, the hot pressing of mating formation, density 760-880kg/m3, sheet material moisture content: 4-7%, the hot pressing factor: 7.0-8.0mm/s;

(11) sheet material cooling 156-166 hour; (12) sanding cutting edge: through abrasive finishing machine abrasive finishing and sawing becomes stock board after sheet material cooling; (13) pack: the stock board after sawing is identified on request, packs.