CN103203790A - Method for producing fiberboard by utilizing cementing property of straw fibers - Google Patents
Method for producing fiberboard by utilizing cementing property of straw fibers Download PDFInfo
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- CN103203790A CN103203790A CN2013100344565A CN201310034456A CN103203790A CN 103203790 A CN103203790 A CN 103203790A CN 2013100344565 A CN2013100344565 A CN 2013100344565A CN 201310034456 A CN201310034456 A CN 201310034456A CN 103203790 A CN103203790 A CN 103203790A
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Abstract
The invention relates to a method for producing a fiberboard by utilizing the cementing property of straw fibers. The method comprises the steps of fiber preparation: cutting straws into sections and screening crushed straws and sediment, machining fibers through a grinder, and screening fibers larger than 20 meshes and smaller than 6 meshes; drying: drying the fibers by hot air at a temperature from 100 DEG C to 150 DEG C until the moisture content of the fibers is between 10% and 15%; glue mixing: adding, by mass, 2%-5% of polyvinyl modified starch glue and 0.5%-1.0% of paraffin to the fibers; paving: using a mechanical airflow paver to pave and spray 10% of an organic acid liquid to enable the PH of the fibers to be 6.0-6.5, the moisture content to be 18%-25% and the thicknesses to be three times of that of a finished product; and hot pressing: covering steel meshes on two sides of the fiberboard, placing the fiberboard on a steel base plate, and arranging the steel base plate in a multi-layer press for pressing at the temperature of 200 DEG C and under the pressure of 2.5-3.0Mpa for 0.5-1.0min/mm.
Description
Technical field: what the present invention relates to is a kind of production method of utilizing the cementing properties manufacturing fiberboard of rice-straw fibre, belongs to medium-density plate material technical field.
Background technology: the straw wood-based plate, usefulness urinates aldehyde glue or the phenol glue resin added is excessive and the quality difficulty is up to standard, with isocyanate glue cost height, makes the straw wood-based plate be difficult to form competitiveness, therefore hinders the development of straw wood-based plate.
Summary of the invention: rice-straw fibre has lumber fibre character, belongs to reproducible natural wooden fiber, and light weight, pliable and tough is the preferred feedstock of making fiberboard.The objective of the invention is to overcome the defective of above-mentioned existence, utilize in the rice-straw fibre and can generate the cementing properties material--contained total amounts such as-hemicellulose, lignin, low intermediate carbohydrate, starch, pectin are maximum, under water, heat, pressure and temporal joint effect, degraded contacts, reacts with fusion, increased activity, stream exhibition, form new cementing properties material, the rice-straw fibre gluing.The present invention adopts semidry method, strengthen the moisture content of fiber, give full play to its bonding capacity when guaranteeing hot pressing, the rice straw fibreboard made from a spot of tasteless, harmless inexpensive environmental protection glue, cost is low, quality good, and the Main physical mechanical performance index has reached the requirement of wooden medium density fibre board (MDF).Technical solution of the present invention: its processing step is divided into:
(1), rice-straw fibre preparation: 1. the straw with moisture content about 30% is cut into the long straw section of 40mm---50mm, screens out broken grass, silt etc.; 2. adopt the beater grinder processing fiber of dress sieve plate; 3. through the rotary screen fiber separation, send gasification furnace production combustion gas less than 20 powder materials, return pulverizer greater than 6 purpose material,＞20 orders＜6 order material are the acceptable fiber feeding storehouse.Saw foam feeding storehouse behind 20 order oscillating riddle blanking aniseed, impurity.
(2), drying: use pneumatic drier, hot blast temperature is 100C °---150C °, the dried fibres moisture content is that 10%---15% send the sandwich layer feed bin, and saw foam moisture content is that 8%---10% is qualified, moist.
(3), glue mixing: 1. use polyvinyl alcohol modification starch aqueous adhesive, resin added is the 2%---5% of fiber quality, and 20% paraffin wax emulsions is waterproofing agent, and the applying wax amount is the 0.5%---1.0% of fiber quality.2. fiber, glue, stone breast are mixed glue, wax, fiber evenly through measuring even input ring type glue mixer in proportion, and the saw foam is not glue mixing of separating powder.
(4), mat formation: adopt mechanical air-flow associating spreading machine, glue mixing fibrous transdermal band measures feed bin and breaks up middle two spreading heads of even input shop core layer materials, and the saw foam is input two ends spreading head shop demoulding layered material after metering, equal distribution cabins.Spraying 10% aqueous solutions of organic acids adjusting pH value to core layer material simultaneously is 6.0---6.5, spray back fiber moisture 18%---25%, mating formation thick is finished product thickness---6 times, wherein saw foam thickness 2.5---3.0mm, the 50mm of both sides portion, widely thicken 10%, the thickness of precompressed aftershaping be finished product thickness 2---3 doubly.The amount of mating formation and forming belt speed proportioning parameter input control system are guaranteed uniformity, the accuracy of pavement thickness.Not cutting edge of the molded breadth of mating formation 1300mm only need transversally get final product for 2540mm is long.
(5), hot pressing: adopt multi-daylight press, platen temperature 200C °, template upper and lower surface cover steel wire and are placed on the thick billet of 2.0mm the hot press of packing into.Hot pressing time is 0.8min/mm---1.0min/mm (finished product is thick), first section 2.5Mpa of pressure, pressurize 0.3min/mm---0.5min/mm; Second section 2.8Mpa---3.0Mpa of pressure, pressurize 0.5min/mm.The release ejecting plate, prevents the bubbling layering at slow interim step-down exhaust.
(6), post-processed: the room temperature buck, subdue internal stress, prevent distortion, be cut into 2440mm * 1220mm standard breadth by cutting edge machine in length and breadth, stacks 48 hours homogenizing moisture content, softening surperficial hard formation, two-sided sanding are thick calmly.
The specific embodiment
Embodiment 1:
(1), rice-straw fibre preparation: 1. weighing moisture content 30% following straw 1500kg, be cut into 40mm and grow, screen out broken grass, silt etc.2. drop into dress sieve plate beater grinder processing fiber.3. composite fibre send gasification furnace to produce combustion gas through 20 orders and the sorting of two sections screen roller screening machines of 6 orders less than 20 powder materials, returns pulverizer greater than 6 order aniseed, and＞20 orders＜6 purposes are acceptable fiber, and the overwhelming majority is the fibre bundle fiber.
(2), fiber drying: adopt pneumatic drier, hot blast temperature 130C ° dried fibres, the moisture content 10.4% of dried fibres, the heavy 1231Kg of fiber, recovery rate 82%, dried fiber recovery rate 74%.Separating powder saw foam moisture content about 10%, qualified moist.
(3), glue mixing: weighing moisture content 10.4% fiber 110Kg, polyvinyl alcohol modification starch adhesive 3Kg, content 20% paraffin wax emulsions waterproofing agent 2.53Kg, in the input ratio, at first that glue and paraffin wax emulsions metering back mixing and stirring is standby, fiber drops into the ring type glue mixer after speed governing discharging spiral and the metering of electronic belt weighing balance interlocking, press the input amount of per minute fiber, the confession epoxy glue liquid measure of speed governing metering glue pump revolution, determine the revolution of applying glue pump per minute by proportioning, each autoregressive parameter is all imported the Electronic Control program, glue, fiber are mixed evenly.Fiber moisture 15% after the glue mixing, the not glue mixing of saw foam.
(4), mat formation: adopt mechanical air-flow associating spreading machine to mat formation, glue mixing fibrous transdermal band metering feed bin is broken up uniform, and two spreading head shop core layer materials are sawed foam drops into two ends after measuring equal distribution cabins top layer shop Tou Pu top layer material (separating powder) in the middle of entering.Spraying 10% aqueous formic acid adjusting core material pH value to core material simultaneously is 6.3.Spray back fiber moisture 19%, pavement thickness are 4---6 times of making sheet thickness, wherein saw foam thickness 2.5---3mm, both sides 50mm is wide to thicken 10%, thickness after the precompressed is finished product thickness 2---3 times, by the amount of mating formation and forming belt speed proportioning parameter input control system, guarantee uniformity, the accuracy of mating formation.
(5), hot pressing: after steel wire is covered in the template above and below, be placed on the 2mm steel plate, the multi-daylight press of packing into, platen temperature are 200C °, and hot pressing time is 0.8min/mm, and pressure is 2.5Mpa, dwell time 0.3min/mm for first section; Second section is 2.8Mpa, pressurize 0.5min/mm.Release ejecting plate, slow interim step-down, exhaust ejecting plate.
(6), post-processed: the room temperature buck is lowered the temperature, is subdued internal stress, prevents distortion.Edge saw is cut into breadth 2440mm * 1220mm standard specification plate in length and breadth.Stacked 48 hours, it is fixed thick to carry out the two sides sanding behind homogenizing moisture, the softening top layer.
Embodiment 2:
(1), rice-straw fibre preparation: 1. weighing moisture content 30% following straw 1500Kg, be cut into 40mm and grow, screen out broken grass, silt etc.2. drop into dress sieve plate beater grinder processing fiber.3. composite fibre send gasification furnace to produce combustion gas through 20 orders and the sorting of two sections screen roller screening machines of 6 orders less than 20 powder materials, returns pulverizer greater than 6 order aniseed, and＞20 orders＜6 purposes are acceptable fiber, and the overwhelming majority is the fibre bundle fiber.The saw foam through 20 order oscillating riddles, screen out the aniseed foreign material.
(2), fiber drying: adopt pneumatic drier, hot blast temperature 130C ° dried fibres, the moisture content 10.7% of dried fibres.Separating powder saw foam moisture content about 10%, qualified moist.
(3), glue mixing: weighing moisture content 10.7% fiber 110Kg, polyvinyl alcohol modification starch adhesive 4Kg, content 20% paraffin wax emulsions waterproofing agent 5Kg, in the input ratio, with glue and waterproofing agent metering mixing and stirring, fiber drops into the ring type glue mixer after speed governing discharging spiral and the metering of electronic belt weighing balance interlocking, press per minute fiber input amount, glue pump revolution output quantity, determine speed governing glue pump revolutions per minute according to proportioning, with each parameter input control system, guarantee glue and fiber are mixed evenly.Fiber moisture 18.2% after the glue mixing.The saw foam is not glue mixing of separating powder.
(4), mat formation: adopt mechanical air-flow associating spreading machine, glue mixing fibrous transdermal band metering feed bin is broken up uniform, drops into middle two spreading heads, shop core layer material, and the saw foam is spread the top layer material through the metering of belt metering feed bin, uniform input two ends spreading head.Simultaneously spray 10% aqueous formic acid to core layer material, to regulate the core material pH value be 6.3, spray back fiber moisture 22%.Pavement thickness be finished product thickness 4---6 doubly, upper and lower top layer saw foam thickness 2.5---3mm wherein, the 50mm of both sides portion is wide, thicken 10%, the thickness after the precompressed be finished product thickness 2---3 doubly.The amount of mating formation and forming belt speed proportioning parameter input control system are guaranteed uniformity, the accuracy of mating formation.
(5), hot pressing: after steel wire is covered on the upper and lower surface of template, be placed on the 2mm steel plate, the multi-daylight press of packing into, platen temperature are 200C °, and hot pressing time is 1.0min/mm.Pressure: first section is 2.5Mpa, time 0.4min/mm; Second section is 3.0Mpa, time 0.6min/mm.Plate is unloaded in slow interim step-down, exhaust.
(6), post-processed: the room temperature buck is lowered the temperature, is subdued internal stress, prevents distortion.Edge saw is cut into breadth 2440mm * 1220mm standard specification plate in length and breadth, stacks that to carry out the two sides sanding behind 48 hours homogenizing moisture, the softening top layer fixed thick.
The present invention utilizes the cementing properties of rice-straw fibre, only needs a spot of tasteless harmless environmental protection glue, makes fiberboard.But mechanization large-scale production, cost only are 1/3rd of traditional medium density fibre board (MDF).After testing, physical and mechanical properties such as the density of plate, MOR, elastic modelling quantity, internal bond strength, nail-holding ability all reach GB/11718---2009[MDF-GPREG] standard-required.Density 750---800kg/m
3, MOR 24---26Mpa, elastic modelling quantity 2500---2700Mpa, internal bond strength 0.56---06Mpa, nail-holding ability 1100---1200N.
Claims (1)
1. utilize the production method of the cementing properties manufacturing fiberboard of rice-straw fibre, its technical characterictic is that its processing step is divided into:
(1), rice-straw fibre preparation: 1. the straw with moisture content about 30% is cut into the long straw section of 40mm---50mm, screens out broken grass, silt etc.; 2. adopt the beater grinder processing fiber of dress sieve plate; 3. through the rotary screen fiber separation, send gasification furnace production combustion gas less than 20 powder materials, return pulverizer greater than 6 purpose material,＞20 orders＜6 order material are the acceptable fiber feeding storehouse, saw foam feeding storehouse behind 20 order oscillating riddle blanking aniseed, impurity.
(2), drying: use pneumatic drier, hot blast temperature is 100C °---150C °, the dried fibres moisture content is that 10%---15% send the sandwich layer feed bin, and saw foam moisture content is that 8%---10% is qualified, moist.
(3), glue mixing: 1. use polyvinyl alcohol modification starch aqueous adhesive, resin added is the 2%---5% of fiber quality, 20% paraffin wax emulsions is waterproofing agent, the applying wax amount is the 0.5%---1.0% of fiber quality, 2. fiber, glue, stone breast are mixed glue, wax, fiber evenly through measuring even input ring type glue mixer in proportion, and the saw foam is not glue mixing of separating powder.
(4), mat formation: adopt mechanical air-flow associating spreading machine, two spreading heads were spread core layer materials in the middle of glue mixing fibrous transdermal band metering feed bin was broken up even input, the saw foam is through metering, all drop into spreading head shop demoulding layered material in two ends after the distribution cabins, spraying 10% aqueous solutions of organic acids adjusting pH value to core layer material simultaneously is 6.0---6.5, spray back fiber moisture 18%---25%, mat formation the thick finished product thickness 4---6 of being doubly, wherein saw foam thickness 2.5---3.0mm, the 50mm of both sides portion, widely thicken 10%, the thickness of precompressed aftershaping is 2---3 times of finished product thickness, the amount of mating formation and forming belt speed proportioning parameter input control system, guarantee the uniformity of pavement thickness, accuracy, not cutting edge of the molded breadth of mating formation 1300mm only need transversally get final product for 2540mm is long.
(5), hot pressing: adopt multi-daylight press, platen temperature 200C °, template upper and lower surface cover steel wire and are placed on the thick billet of 2.0mm, the hot press of packing into, hot pressing time is 0.8min/mm---1.0min/mm (finished product is thick), first section 2.5Mpa of pressure, pressurize 0.3min/mm---0.5min/mm; Second section 2.8Mpa---3.0Mpa of pressure, pressurize 0.5min/mm, prevent the bubbling layering at release ejecting plate, slow interim step-down exhaust.
(6), post-processed: the room temperature buck, subdue internal stress, prevent distortion, be cut into 2440mm * 1220mm standard breadth by cutting edge machine in length and breadth, stacks 48 hours homogenizing moisture content, softening surperficial hard formation, two-sided sanding are thick calmly.
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| CN2013100344565A CN103203790A (en) | 2013-01-30 | 2013-01-30 | Method for producing fiberboard by utilizing cementing property of straw fibers |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105082317A (en) * | 2014-05-04 | 2015-11-25 | 李先强 | Method for making composite board by means of straw |
| CN105401483A (en) * | 2015-11-12 | 2016-03-16 | 何志明 | High-abrasion resistance paperboard and production technology thereof |
| CN105856379A (en) * | 2016-04-14 | 2016-08-17 | 华南理工大学 | Environment-friendly high-strength lignocellulose plate and preparing method thereof |
| CN106239690A (en) * | 2016-07-20 | 2016-12-21 | 山东农业大学 | A kind of poplar and the hot-air dry method of corn straw brick |
| CN111203947A (en) * | 2020-01-15 | 2020-05-29 | 安捷包装（苏州）股份有限公司 | Method for preparing long fiber composite board by adopting straw base material |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105082317A (en) * | 2014-05-04 | 2015-11-25 | 李先强 | Method for making composite board by means of straw |
| CN105401483A (en) * | 2015-11-12 | 2016-03-16 | 何志明 | High-abrasion resistance paperboard and production technology thereof |
| CN105856379A (en) * | 2016-04-14 | 2016-08-17 | 华南理工大学 | Environment-friendly high-strength lignocellulose plate and preparing method thereof |
| CN106239690A (en) * | 2016-07-20 | 2016-12-21 | 山东农业大学 | A kind of poplar and the hot-air dry method of corn straw brick |
| CN111203947A (en) * | 2020-01-15 | 2020-05-29 | 安捷包装（苏州）股份有限公司 | Method for preparing long fiber composite board by adopting straw base material |
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Application publication date: 20130717 |