CN105150338A - Manufacturing method for formaldehyde-free medium and high density fiber panel - Google Patents

Abstract

The invention discloses a manufacturing method for a formaldehyde-free medium and high density fiber panel, and relates to the technical field of artificial panel manufacturing. The manufacturing method includes the following operation steps: chipping, screening, stewing softening, hot grinding, water-proofing agent applying, glue applying, drying, winnowing, paving, hot pressing, cooling, sawing the panel into a stock panel, and identifying and packaging according to requirements. In the manufacturing process, release agent mixed liquid, isocyanate glue and a paraffin emulsion water-proofing agent are applied, the formaldehyde emission is 0.3 mg/100 g and is lower than formaldehyde amount which is 0.5 mg/100 g and exists in the wood. Compared with the prior art, the problem that when an existing medium and high density fiber panel is used in an indoor drying state, formaldehyde emission exists is solved.

Description

Without the manufacture method of aldehyde medium and high density fibre panel

Technical field

The present invention relates to artificial board manufacturing technology field, especially a kind of for the manufacture method without aldehyde medium and high density fibre panel.

Background technology

Medium and high density fibre panel at present mostly with wood-fibred and urea-formaldehyde resin adhesive for main material production, wherein formaldehyde is mainly derived from urea-formaldehyde resin adhesive, there is Form aldehyde release problem.The manufacture method of existing a kind of ultra-low formaldehyde emission medium-to-high density fiberboard, to comprise timber by peeling, chip, screen, wash, boiling, defibrator process, applying glue, execute waterproofing agent, fiber drying, mat formation, hot pressing, cooling, sanding, sawing make medium and high density fibre panel; Wherein in applying glue operation, add the cyanurotriamide modified urea resin glue of low formaldehyde content as gluing glue, addition is 14% ~ 18% of dry fiber.In use there are the following problems for this ultra-low formaldehyde emission medium-to-high density fiberboard: 1, because this ultra-low formaldehyde emission medium-to-high density fiberboard uses under indoor seasoning state, the adhesive used because of it remains containing aldehyde glue, formaldehyde in fiberboard still can outwards discharge, and burst size of methanal is greater than 2mg/100g; Do not reach without aldehyde state, to environment, especially to the mankind lived in wherein, still have certain injury, in addition, use, such as kitchen under high humility state, can the very fast moisture absorption moisture absorption splash swollen, service life be short; 2, timber will through peeling, and lumber consumption is high; 3, wood chip through washing, will produce massive laundering waste water.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of manufacture method without aldehyde medium and high density fibre panel, to solve the problem that there is Form aldehyde release when existing medium and high density fibre panel uses under indoor seasoning state.

The technical scheme that technical solution problem of the present invention adopts is: a kind of manufacture method without aldehyde medium and high density fibre panel, comprises following operating procedure:

(1) chip: wood raw material is undertaken chipping and the impurity removed in wood material and metal hard object by wood chipping equipment;

(2) screen: from the wood chip cut, filter out length is 20 millimeters ~ 60 millimeters, and wide is 10 millimeters ~ 30 millimeters, thick is the wood chip of 2 millimeters ~ 6 millimeters, and the impurity removed wherein and metal hard object;

(3) boiling is softened: the wood chip of step (2) gained is put into the boiling of boiling cylinder, and boiling temperature is 165 DEG C ~ 180 DEG C, and cooking pressure is 7.5 bar ~ 8.5 bar, and the time is 2 minutes ~ 5 minutes;

(4) defibrator process: mill room defibrator process put into by the wood chip that the boiling of step (3) gained has been softened, and mill chamber pressure is 8.5 bar ~ 9.5 bar, and temperature is 165 DEG C ~ 180 DEG C, and wood chip is separated into fiber by mill room;

(5) execute waterproofing agent: by Paraffin emulsion waterproof agent by delivery pump after nozzle atomization, add wet fiber conveyance conduit, with wet fiber Homogeneous phase mixing; The applied amount of Paraffin emulsion waterproof agent is 3kg/m3 ~ 6kg/m3;

(6) applying glue: remover is mixed liquid and isocyanate glue by delivery pump after nozzle atomization, add wet fiber conveyance conduit, with the wet fiber Homogeneous phase mixing of step (5) gained; Isocyanate glue applied amount is 4% ~ 8% of dry fiber; Remover mix that liquid applied amount is dry fiber 0.5% ~ 0.8%, remover mix liquid by water with remover by (0.5 ~ 1): 1 mixes gained;

(7) dry: the wet fiber of step (6) gained to be entered drying duct and carries out drying, dry inlet temperature 120 DEG C ~ 150 DEG C, dry outlet temperature 50 DEG C ~ 70 DEG C;

(8) fiber of fiber storage silo is by selection by winnowing pipeline before mating formation, and impurity and thick fiber is screened, and selection by winnowing negative pressure is that-7 handkerchiefs are to-15 handkerchiefs;

(9) mating formation: fiber sizing is shaping through mating formation, by adjusting weight of mating formation, obtaining the slab of various density, fiber moisture 6% ~ 10% of mating formation;

(10) precompressed: by the slab of step (9) gained through preformer precompressed, obtain slab, preload pressure is 4MPa ~ 10MPa, and thickness compression ratio is 2.5 ~ 4, and described thickness compression ratio is the ratio of thickness after thickness and slab precompressed before slab precompressed;

(11) hot pressing: the slab hot pressing of step (10) gained is obtained qualified sheet material, panel density is 730kg/m ³~ 780kg/m ³, sheet material moisture content is 4% ~ 7%, hot pressing factor 12.0mm/s ~ 16.0mm/s; Wherein hot pressing temperature is: the first stage 200 DEG C ~ 230 DEG C; Second stage 210 DEG C ~ 240 DEG C; Phase III 220 DEG C ~ 245 DEG C; Fourth stage 220 DEG C ~ 240 DEG C; Five-stage 200 DEG C ~ 230 DEG C; 6th stage 190 DEG C ~ 220 DEG C; Hot pressing pressure is: high pressure section 1.5Mpa ~ 3.0Mpa, heat transfer segment 0.1Mpa ~ 1.0Mpa, fixed thick section of 0.5Mpa ~ 1.5Mpa;

(12) cooled by the sheet material completing hot pressing in step (11), cool time is 24 hours ~ 168 hours;

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

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

Owing to have employed technique scheme, the present invention compared with prior art has following beneficial effect: 1, owing to being non-aldehyde series plastics as the isocyanate glue in adhesive, not containing formaldehyde, therefore, product burst size of methanal is 0.3mg/100g, be less than 0.5mg/100g, this amount is the amount that timber own metabolism thing exists, 2, by the medium and high density fibre panel that the present invention produces, surface peak density reaches 950 ~ 1000kg/m ³, surface bonding intensity reaches 1Mpa, when exposing in wet condition, can intercept or extend suction and the infiltration of hydrone to greatest extent, improves the moisture protection of plate, 3, because isocyanates mixes with moisture, can react and generate multiple harmless polymer and carbon dioxide, can with the oh group generation chemical reaction of the moisture in timber and timber, temperature starts solidification when being 60 DEG C ~ 1000 DEG C, in subsequent storage process, or after boiling test, isocyanate glue can react further with the oh group of the moisture in timber and timber, and promote that sheet material internal intensity promotes, not only enhance machinery cementing, and add water-fast chemical bonding, product humidity resistance and Typical physical mechanical performance index in storage subsequently and use procedure can obtain stable or improve (see table two), in addition, 70 DEG C of moist static bending strength>=10.78,70 DEG C of thickness imbibition rate≤10, tensile strain rate is less than 0.5%, 100 DEG C of internal bond strength>=0.15, reaches the moistureproof level of Nippon Standard, can use under high humidity environment, such as manufacture high-end furniture, kitchen furniture, handicraft, decorations etc., 4, timber is without peeling, and timber resources can be fully used, 5, wood chip does not wash the generation that can reduce washing waste water with water, saving water resource.

Detailed description of the invention

Below in conjunction with enforcement, the invention will be further described:

Embodiment 1:

Thickness is the manufacture method of 18mm without aldehyde medium and high density fibre panel, comprises following operating procedure:

(1) chip: the wood raw material of not peeling is chipped by wood chipping equipment;

(2) screen: from the wood chip cut, filter out length is 20 millimeters, and wide is 10 millimeters, thick is the wood chip of 2 millimeters, and removes wherein impurity and metal hard object;

(3) boiling is softened: the wood chip of step (2) gained is put into the boiling of boiling cylinder, and boiling temperature is 165 DEG C, and cooking pressure is 7.5 bar, and the time is 2 minutes;

(4) defibrator process: mill room defibrator process put into by the wood chip that the boiling of step (3) gained has been softened, and mill chamber pressure is 8.5 bar, and temperature is 165 DEG C, and wood chip is separated into fiber by mill room;

(5) execute waterproofing agent: by Paraffin emulsion waterproof agent by delivery pump after nozzle atomization, add wet fiber conveyance conduit, with wet fiber Homogeneous phase mixing; The applied amount of Paraffin emulsion waterproof agent is 3kg/m ³;

(6) applying glue: remover is mixed liquid and isocyanate glue by delivery pump after nozzle atomization, add wet fiber conveyance conduit, with the wet fiber Homogeneous phase mixing of step (5) gained; Isocyanate glue applied amount is 4% of dry fiber; Remover mix that liquid applied amount is dry fiber 0.5%, remover mix liquid by water with remover by 0.5:1 mixing gained; Isocyanate glue glue applied amount is 4% of dry fiber;

(7) dry: the wet fiber of step (6) gained to be entered drying duct and carries out drying, dry inlet temperature 120 DEG C, dry outlet temperature 50 DEG C;

(8) fiber of fiber storage silo is by selection by winnowing pipeline before mating formation, and impurity and thick fiber is screened, and selection by winnowing negative pressure is that-7 handkerchiefs are to-15 handkerchiefs;

(9) mating formation: fiber sizing is shaping through mating formation, by adjusting weight of mating formation, obtaining the slab of various density, fiber moisture 6% of mating formation;

(10) precompressed: by the slab of step (9) gained through preformer precompressed, obtain being vented abundant, closely knit, thickness evenly and there is the slab of certain just intensity, preload pressure is 4MPa, and thickness compression ratio is 2.5, and thickness compression ratio is the ratio of thickness after thickness and slab precompressed before slab precompressed;

(11) hot pressing: the slab of step (10) gained is obtained qualified sheet material through hot pressing, panel density is 730kg/m ³, sheet material moisture content is 4%, and the hot pressing factor is 12.0mm/s; Wherein hot pressing temperature is: the first stage 200 DEG C; Second stage 210 DEG C; Phase III 220 DEG C; Fourth stage 220 DEG C; Five-stage 200 DEG C; 6th stage 190 DEG C; Hot pressing pressure is: high pressure section 1.5Mpa, heat transfer segment 0.1Mpa, fixed thick section of 0.5Mpa;

(12) cooled by the sheet material completing hot pressing in step (11), cool time is 24 hours ~ 168 hours;

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

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

Embodiment 2:

Thickness is the manufacture method of 18mm without aldehyde middle-high density fiber banksia rose plate, comprises following operating procedure:

(1) chip: the full weedtree of belt leather is chipped by wood chipping equipment;

(2) screen: from the wood chip cut, filter out length is 60 millimeters, and wide is 30 millimeters, thick is the wood chip of 6 millimeters, and removes wherein impurity and metal hard object;

(3) boiling is softened: the wood chip of step (2) gained is put into the boiling of boiling cylinder, and boiling temperature is 180 DEG C, and cooking pressure is 8.5 bar, and the time is 5 minutes;

(4) defibrator process: mill room defibrator process put into by the wood chip that the boiling of step (3) gained has been softened, and mill chamber pressure is 9.5 bar, and temperature is 180 DEG C, and wood chip is separated into fiber by mill room;

(5) execute waterproofing agent: by Paraffin emulsion waterproof agent by delivery pump after nozzle atomization, add wet fiber conveyance conduit, with wet fiber Homogeneous phase mixing; The applied amount of Paraffin emulsion waterproof agent is 6kg/m ³;

(6) applying glue: remover is mixed liquid and isocyanate glue by delivery pump after nozzle atomization, add wet fiber conveyance conduit, with the wet fiber Homogeneous phase mixing of step (5) gained; Isocyanate glue applied amount is 8% of dry fiber; Remover mix that liquid applied amount is dry fiber 0.8%, remover mix liquid by water with remover by 1:1 mixing gained;

(7) dry: the wet fiber of step (6) gained to be entered drying duct and carries out drying, dry inlet temperature 150 DEG C, dry outlet temperature 70 DEG C;

(8) fiber of fiber storage silo is by selection by winnowing pipeline before mating formation, and impurity and thick fiber is screened, and selection by winnowing negative pressure is that-7 handkerchiefs are to-15 handkerchiefs;

(9) mating formation: fiber sizing is shaping through mating formation, by adjusting weight of mating formation, obtaining the slab of various density, fiber moisture 10% of mating formation;

(10) precompressed: by the slab of step (9) gained through preformer precompressed, obtain being vented abundant, closely knit, thickness evenly and there is the slab of certain just intensity, preload pressure is 10MPa, and thickness compression ratio is the ratio of thickness after thickness and slab precompressed before slab precompressed;

(11) hot pressing: the hair plates hot pressing of step (10) gained is obtained qualified sheet material, panel density is 780kg/m ³, sheet material moisture content is 7%, and the hot pressing factor is 16.0mm/s; Wherein hot pressing temperature is: the first stage 230 DEG C; Second stage 240 DEG C; Phase III 245 DEG C; Fourth stage 240 DEG C; Five-stage 230 DEG C; 6th stage 220 DEG C; Hot pressing pressure is high pressure section 3.0Mpa, heat transfer segment 1.0Mpa, fixed thick section of 1.5Mpa;

(12) cooled by the sheet material completing hot pressing in step (11), cool time is 24 hours ~ 168 hours;

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

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

Embodiment 3:

Thickness is the manufacture method of 18mm without aldehyde middle-high density fiber rosin plate, comprises following operating procedure:

(1) chip: the pine of peeling is chipped by wood chipping equipment;

(2) screen: from the wood chip cut, filter out length is 40 millimeters, and wide is 30 millimeters, thick is the wood chip of 6 millimeters, and removes wherein impurity and metal hard object;

(3) boiling is softened: the wood chip of step (2) gained is put into the boiling of boiling cylinder, and boiling temperature is 180 DEG C, and cooking pressure is 8.5 bar, and the time is 5 minutes;

(4) defibrator process: mill room defibrator process put into by the wood chip that the boiling of step (3) gained has been softened, and mill chamber pressure is 9.5 bar, and temperature is 180 DEG C, and wood chip is separated into fiber by mill room;

(5) execute waterproofing agent: by Paraffin emulsion waterproof agent by delivery pump after nozzle atomization, add wet fiber conveyance conduit, with wet fiber Homogeneous phase mixing; The applied amount of Paraffin emulsion waterproof agent is 6kg/m ³;

(6) applying glue: remover is mixed liquid and isocyanate glue by delivery pump after nozzle atomization, add wet fiber conveyance conduit, with the wet fiber Homogeneous phase mixing of step (5) gained; Isocyanate glue applied amount is 8% of dry fiber; Remover mix that liquid applied amount is dry fiber 0.8%, remover mix liquid by water with remover by 1:1 mixing gained;

(7) dry: the wet fiber of step (6) gained to be entered drying duct and carries out drying, dry inlet temperature 150 DEG C, dry outlet temperature 70 DEG C;

(8) fiber of fiber storage silo is by selection by winnowing pipeline before mating formation, and impurity and thick fiber is screened, and selection by winnowing negative pressure is that-7 handkerchiefs are to-15 handkerchiefs;

(9) mating formation: fiber sizing is shaping through mating formation, by adjusting weight of mating formation, obtaining the slab of various density, fiber moisture 10% of mating formation;

(10) precompressed: by the slab of step (9) gained through preformer precompressed, obtain being vented abundant, closely knit, thickness evenly and there is the slab of certain just intensity, preload pressure is 10MPa, and thickness compression ratio is the ratio of thickness after thickness and slab precompressed before slab precompressed;

(11) hot pressing: the hair plates hot pressing of step (10) gained is obtained qualified sheet material, panel density is 780kg/m ³, sheet material moisture content is 7%, and the hot pressing factor is 16.0mm/s; Wherein hot pressing temperature is: the first stage 230 DEG C; Second stage 240 DEG C; Phase III 245 DEG C; Fourth stage 240 DEG C; Five-stage 230 DEG C; 6th stage 220 DEG C; Hot pressing pressure is high pressure section 3.0Mpa, heat transfer segment 1.0Mpa, fixed thick section of 1.5Mpa;

(12) cooled by the sheet material completing hot pressing in step (11), cool time is 24 hours ~ 168 hours;

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

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

As shown in Table 1, table two is the conventional and humidity resistance testing result tracking (initial survey, follow-up inspection contrast in two, three months) without aldehyde plate of 18 millimeters to its performance of the sheet material that said method manufacture obtains.

Claims (1)

1., without a manufacture method for aldehyde medium and high density fibre panel, it is characterized in that comprising following operating procedure:

(1) chip: wood raw material is undertaken chipping and the impurity removed in wood material and metal hard object by wood chipping equipment;

(2) screen: from the wood chip cut, filter out length is 20 millimeters ~ 60 millimeters, and wide is 10 millimeters ~ 30 millimeters, thick is the wood chip of 2 millimeters ~ 6 millimeters, and the impurity removed wherein and metal hard object;

(3) boiling is softened: the wood chip of step (2) gained is put into the boiling of boiling cylinder, and boiling temperature is 165 DEG C ~ 180 DEG C, and cooking pressure is 7.5 bar ~ 8.5 bar, and the time is 2 minutes ~ 5 minutes;

(4) defibrator process: mill room defibrator process put into by the wood chip that the boiling of step (3) gained has been softened, and mill chamber pressure is 8.5 bar ~ 9.5 bar, and temperature is 165 DEG C ~ 180 DEG C, and wood chip is separated into fiber by mill room;

(5) execute waterproofing agent: by Paraffin emulsion waterproof agent by delivery pump after nozzle atomization, add wet fiber conveyance conduit, with wet fiber Homogeneous phase mixing; The applied amount of Paraffin emulsion waterproof agent is 3kg/m3 ~ 6kg/m3;

(6) applying glue: remover is mixed liquid and isocyanate glue by delivery pump after nozzle atomization, add wet fiber conveyance conduit, with the wet fiber Homogeneous phase mixing of step (5) gained; Isocyanate glue applied amount is 4% ~ 8% of dry fiber; Remover mix that liquid applied amount is dry fiber 0.5% ~ 0.8%, remover mix liquid by water with remover by (0.5 ~ 1): 1 mixes gained;

(7) dry: the wet fiber of step (6) gained to be entered drying duct and carries out drying, dry inlet temperature 120 DEG C ~ 150 DEG C, dry outlet temperature 50 DEG C ~ 70 DEG C;

(8) fiber of fiber storage silo is by selection by winnowing pipeline before mating formation, and impurity and thick fiber is screened, and selection by winnowing negative pressure is that-7 handkerchiefs are to-15 handkerchiefs;

(9) mating formation: fiber sizing is shaping through mating formation, by adjusting weight of mating formation, obtaining the slab of various density, fiber moisture 6% ~ 10% of mating formation;

(10) precompressed: by the slab of step (9) gained through preformer precompressed, obtain slab, preload pressure is 4MPa ~ 10MPa, and thickness compression ratio is 2.5 ~ 4, and described thickness compression ratio is the ratio of thickness after thickness and slab precompressed before slab precompressed;

(11) hot pressing: the slab hot pressing of step (10) gained is obtained qualified sheet material, panel density is 730kg/m ³~ 780kg/m ³, sheet material moisture content is 4% ~ 7%, hot pressing factor 12.0mm/s ~ 16.0mm/s; Wherein hot pressing temperature is: the first stage 200 DEG C ~ 230 DEG C; Second stage 210 DEG C ~ 240 DEG C; Phase III 220 DEG C ~ 245 DEG C; Fourth stage 220 DEG C ~ 240 DEG C; Five-stage 200 DEG C ~ 230 DEG C; 6th stage 190 DEG C ~ 220 DEG C; Hot pressing pressure is: high pressure section 1.5Mpa ~ 3.0Mpa, heat transfer segment 0.1Mpa ~ 1.0Mpa, fixed thick section of 0.5Mpa ~ 1.5Mpa;

(12) cooled by the sheet material completing hot pressing in step (11), cool time is 24 hours ~ 168 hours;

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

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