CN101407072B - Production method for bulrush beaverboard - Google Patents

Abstract

The invention is a technical invention in the field of wood processing technology, which is a method for producing a fiberboard with the thickness of between 1.6 and 30 millimeters and the density ofbetween 0.5 and 1.0g/cm<3> by using a plant of Gramineae, namely reed and comprises the following steps: performing fiber separation for a reed, applying fiber adhesive and other additives on the reed, drying the reed in a hot air drier until the final moisture content is between 6 and 12 percent, paving the reed into board blanks with uniform thickness and density by a mechanical or airflow vacuum paving machine, and performing hot compression in a slab hot press or a rolling hot press so as to produce reed fiberboards with different densities. The reed fiber produced by the invention is complete and uniform in shape, the physical and mechanical properties of fiberboard products reach relevant national standards, and the free formaldehyde releasing amount reaches the requirements of E1 level standard. The method makes use of the reed which is widely distributed and has low cost and low utilization rate to produce products with high added value.

Description

The production method of bulrush beaverboard

One, technical field

The invention discloses a kind of pulverizer pulverizing that utilizes gramineae plant-reed through special use, make the stalk shape reed of certain size, adopt that boiling is softening, fiber separation, fiber drying, mat formation, dull and stereotyped hot pressing or hot pressing roller pressing mode, produce the preparation method of the bulrush beaverboard of different-thickness and different densities, its major technique is characterized as: utilize adhesive such as Lauxite to produce thickness range and be 1.6mm-30mm, density 0.5g/cm ³-1.0g/cm ³Fiberboard.

Two, background technology

Because various countries are to the protection of the environment and the forest reserves, the shortage of timber resources forces people to utilize various raw materials to research and produce composite wooden material, satisfies the deficiency of the needs and the alleviation timber resources in market.Therefore utilizing various available gramineae plants to produce wood-based plate is emphasis and the research forward position of paying close attention to both at home and abroad.

Reed Phragmites australis (Cav.) Trin.exSteud is the perennial tall and big herbaceous plant of grass family, be distributed widely in all over the world, be the important wetland species that the world blazons, be well differentiated grassy marshland and muskeg constructive species on the form, have adaptation and morphological variation widely, and high ecology and socioeconomic value are arranged.

China's reed aboundresources, widely distributed and concentrated, there are 14 reed main producing regions, reed area 1.3 * 10 in the nationwide now ⁶Hm ²More than, because economic worth of reed and ecological value have caused China scientific worker's attention, at present do paper making raw material, be described as " first forest " by people because Phragmites communis population often becomes the Main Constructive Species of wetland plant group, even account for absolute advantage with its replacing wood.

Reed belongs to perennial plant, and the growth in the coming year of felling back is better, so the output height, can satisfy the demand of factory mass.Stalk shape reed fiber yield height, form after separating is good, can be according to different instructions for uses, adopt dull and stereotyped pressure sintering or pressure roller pressure sintering to produce the bulrush beaverboard of all thickness and density, its properties of product are stable, and the high variability of intensity is little, dimensional stability good.Performance with the bulrush beaverboard of adhesive productions such as Lauxite can match in excellence or beauty with the medium density fibre board (MDF) of timber production.Its product is mainly used in fields such as packing, floor, furniture, building, finishing, and therefore the fiberboard that uses reed to produce different densities has broad application prospects.

Three, summary of the invention

1. Fa Ming purpose

What the objective of the invention is to enlarge reed utilizes scope and value.The ecological environment and the ecological balance of protection lake region and wetland help the protection of China's wildwood resource simultaneously.Utilize the reed product of urea-formaldehyde resin adhesive production high added value.

2. technical scheme

What the present invention relates to is the method for using reed producd fibers plate, its processing step:

(1) feedstock production: pulverizer is made certain-length with reed, and the silt in pneumatic separation removal raw material is made long 10mm-100mm, the stalk shape reed of wide 1mm-5mm;

(2) fiber separation and drying: the reed after will pulverizing is transported to the softening 6min-15min of boiling in 140 ℃-190 ℃ the autoclaving jar, reed after softening is separated into fibrous material, applies waterproofing agent and the 10%-16% Lauxite of 0.5%-1.6% in the reed fiber separation process respectively; The curing agent applied amount is the 0.7%-1.5% of glue solid masses; When producing other functional fiber plate, add corresponding chemical assistant; Reed fiber after the separation is dried to whole moisture content in hot air drying machine be 6%-12%, and dry temperature range is 120 ℃-200 ℃;

(3) mat formation, precompressed and hot pressing: adopt machinery or airflow pavement machine to mat formation, the vacuum of spreading machine is according to the thickness adjustment of plate, makes to mat formation back slab density, thickness evenly and carry out precompressed; Flat-bed press or pressure roller hot press are adopted in hot pressing, and the fiberboard density range that hot pressing is made is 0.5g/cm ³-1.0g/cm ³, thickness is 1.6mm-30mm; Temperature during hot pressing is 150 ℃-250 ℃, and the time is 1min-15min, and the pressure during flat-bed press hot pressing is 2MPa-8MPa, and the pressure during the pressure roller hot press is 2500N/cm-3500N/cm;

(4) post-processed: in order to make the fiberboard after the hot pressing smooth, be convenient to sanding, the sheet material after the hot pressing needed through Balance Treatment 2-3 days.

Advantage of the present invention: adopt the mode of dull and stereotyped hot pressing or pressure roller hot pressing to produce the fiberboard of different densities and thickness, manufacture method is simple, can enlarge the scope of utilizing of reed, improves the reed value, and the bulrush beaverboard cost of making is low, and intensity is big; Product can be in sector applications such as furniture, construction and decoration, floors.

Four, the specific embodiment

Embodiment 1:

Describe the present invention below in conjunction with example, but given example is not limit in invention.

(1) pulverizer is smashed reed, filters out impurity such as silt, tiny raw material, and the stalk shape reed that makes is of a size of long 10mm-80mm, wide 1.4mm-3.3mm;

(2) boiling 10 minutes in 160 ℃ preheating cooker is separated into fiber through defibrator; The addition of paraffin is 1.3%; The addition of adhesive is 14%; The curing agent applied amount is 1.0% of a solid gum quality;

(3) reed fiber drying, baking temperature are 150 ℃, and the whole moisture content of dry back reed fiber is 8%;

(4) adopt the vacuum machine spreading machine to mat formation, mat formation into density, the uniform slab of thickness, slab is through precompressed, preload pressure 2200N/cm;

(5) adopt flat-bed press hot pressing, hot pressing temperature is 200 ℃, and hot pressing time is 6min, hot pressing pressure 3.2MPa;

(6) sheet material after the hot pressing cool off at normal temperatures, cutting edge, measure the performance of bulrush beaverboard.

Performance indications are as follows:

Plate thickness: 10mm 10mm

Density: 0.70g/cm ³0.75g/cm ³

Internal bond strength: 0.55MPa 0.55MPa

MOR: 22.6MPa 23.9MPa

Elastic modelling quantity: 2510MPa 2550MPa

Embodiment 2:

(1) the reed size after the pulverizing: length is 30mm-90mm, wide 1.2mm-3.5mm;

(2) boiling in 160 ℃ cooker of stalk shape reed was softened 9 minutes, was separated into reed fiber then; The waterproofing agent applied amount is 1% of a bone dry fiber quality; The adhesive applied amount is 12% of a bone dry fiber quality; The curing agent applied amount is 1.1% of a solid gum quality;

(3) baking temperature is 170 ℃, and the whole moisture content of dry back reed fiber is 11%;

(4) slab by the hot pressing roll-in to density 0.85-0.95g/cm ³, the high-density fiber plate thickness of making is 3.0mm, and the hot pressing roll surface temperature is 180 ℃, and hot pressing time is 2min, and hot pressing pressure is 2800N/cm, 2950N/cm, 3100N/cm;

(5) fiberboard after the hot pressing after cooling, saw cut, deposit 48 hours, is measured the performance of bulrush beaverboard at normal temperatures.

(6) performance indications are as follows:

Density: 0.95g/cm ³0.90g/cm ³0.85g/cm ³

Internal bond strength: 0.84MPa 0.76MPa 0.66MPa

MOR: 25.9MPa 24.7MPa 23.2MPa

Elastic modelling quantity: 4161MPa 3907MPa 3135MPa

Claims (1)

1. the production method of bulrush beaverboard, the technology that it is characterized in that it is following steps:

(1) feedstock production: pulverizer is made certain-length with reed, and the silt in pneumatic separation removal raw material is made long 10mm-100mm, the stalk shape reed of wide 1mm-5mm;

(2) fiber separation and drying: the reed after will pulverizing is transported to the softening 6min-15min of boiling in 140 ℃-190 ℃ the autoclaving jar, reed after softening is separated into fibrous material, applies waterproofing agent and the 10%-16% Lauxite of 0.5%-1.6% in the reed fiber separation process respectively; The curing agent applied amount is the 0.7%-1.5% of glue solid masses; When producing other functional fiber plate, add corresponding chemical assistant; Reed fiber after the separation is dried to whole moisture content in hot air drying machine be 6%-12%, and dry temperature range is 120 ℃-200 ℃;

(3) mat formation, precompressed and hot pressing: adopt machinery or airflow pavement machine to mat formation, the vacuum of spreading machine is according to the thickness adjustment of plate, makes to mat formation back slab density, thickness evenly and carry out precompressed; Flat-bed press or pressure roller hot press are adopted in hot pressing, and the fiberboard density range that hot pressing is made is 0.5g/cm ³-1.0g/cm ³, thickness is 1.6mm-30mm; Temperature during hot pressing is 150 ℃-250 ℃, and the time is 1min-15min, and the pressure during flat-bed press hot pressing is 2MPa-8MPa, and the pressure during the pressure roller hot press is 2500N/cm-3500N/cm;

(4) post-processed: in order to make the fiberboard after the hot pressing smooth, be convenient to sanding, the sheet material after the hot pressing needed through Balance Treatment 2-3 days.