CN1128046C - Process for preparing middle-density rice straw board - Google Patents
Process for preparing middle-density rice straw board Download PDFInfo
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- CN1128046C CN1128046C CN 01137361 CN01137361A CN1128046C CN 1128046 C CN1128046 C CN 1128046C CN 01137361 CN01137361 CN 01137361 CN 01137361 A CN01137361 A CN 01137361A CN 1128046 C CN1128046 C CN 1128046C
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- straw
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Abstract
The present invention relates to a production method for producing and processing a medium-density strawboard, which comprises the following technical steps: (1), material preparation: straw is cut into stalk units of 30 to 50mm; scrap leaves, mud, etc. are sieved and removed; the straw which is crushed by a crusher and is mechanically sieved is divided into coarse materials and fine materials; (2), drying: the drying temperature is from 100 to 150DEG C, and the water ratio reaches 3% to 10%. (3), separation: the materials are separated by a rotary sieve, the fine materials are transported to a material storehouse of a surface layer, and the coarse materials are transported to a material storehouse of a core layer; (4), glue blending: glue is blended in a circular type glue blending machine, and isocyanate is used as an adhesive; (5), paving: an airflow type paving machine is used, and the thickness of a paved board blank is 8 to 15 times of the thickness of a medium-density strawboard of a finished product; (6), heat press: the hot pressing temperature is from 140 to 170 DEG C, the hot pressing time is from 0.5 to 0.8 min/mm, and the hot pressing pressure is from 2.5 to 3.0Mpa; (7), post-treatment: the board blank carries out the steps of cooling, edge trimming, stacking and sanding. The present invention has the advantage that the rationality of the shape of the straw scraps is ensured by the device modification of the wooden shaving board and three times of sieving. The medium-density strawboard is prepared under the condition of high utilization rate of raw materials, and the main physical mechanical property indexes of the medium-density strawboard reach the requirements of a wooden medium-density fiberboard.
Description
Technical field
What the present invention relates to is a kind of production method of production and processing median density straw board, belongs to medium-density plate material technical field.
Background technology
At present, the main production technology of compressed straw slab is the production technology of copying wooden flake board, and the product of producing only reaches the requirement of particieboard product.If with density rice straw fibreboard in the straw raw material production, then the yield of fiber is lower, and cost is improved, be difficult to and the competition of wooden medium density fibre board (MDF).
Summary of the invention
The objective of the invention is to the defective at above-mentioned existence, the production method of new median density straw board produces median density straw board, and its Main physical mechanical performance index has reached the requirement of wooden medium density fibre board (MDF).Technical solution of the present invention: the preparation of its processing step branch (1) crushed aggregates of straw: the stalk unit that 1. straw is cut into 30-50mm, impurity such as the broken leaf in the screening removal raw material, silt particle, 2. the stalk unit after the screening is through crusher in crushing, 3. the crushed aggregates of straw after the fragmentation screens through mechanical type again, 8 orders, 20 orders, 100 mesh sieves are told thick, fines second gear, wherein 8 orders＜coarse fodder＜20 orders, 2. 4. 20 orders＜fines＜100 orders will turn back to greater than 8 purpose crushed aggregates of straw; (2) drying: thick, thin crushed aggregates of straw is adopted rotator type drying machine drying, and baking temperature is 100-150 ℃, makes the moisture content of crushed aggregates of straw reach 3%-10%; (3) sorting: dried crushed aggregates of straw carries out sorting with roto-siofter again, makes fines send into the top layer feed bin, and coarse fodder then enters the sandwich layer feed bin; (4) glue mixing: glue mixing in ring type glue mixer (prior art) is an adhesive with isocyanates, and the resin added top layer is 5-6%, sandwich layer is 4-5%, will add waterproofing agent during applying glue, and waterproofing agent accounts for the 0.5-1% of crushed aggregates of straw weight, applying glue is even, and the crushed aggregates of straw moisture content of mixing glue is 8-16%; (5) mat formation: use the air-flowing type spreading machine, control the uniformity of slab density well, the slab thickness after mating formation be finished product median density straw board thickness 8-15 doubly; (6) hot pressing: press adopts the hot press of single or multiple lift form, need take to prevent the measure of haftplatte before the hot pressing, as using releasing agent, processing release paper or demoulding backing plate, hot pressing temperature is 140-170 ℃, hot pressing time is 0.5-0.8min/mm, and hot pressing pressure is 2.5-3.0Mpa; (7) post-processed: the sheet material after the hot pressing cools off at normal temperatures, and cutting edge becomes the plate face specification of standard then, and book size is 1220mm * 2440mm, and stacking carries out sanding after 48 hours.Advantage of the present invention: by scrap build to wooden flake board, by three screenings, guaranteed the reasonability of crushed aggregates of straw form, under the raw material availability condition with higher, produce median density straw board, its Main physical mechanical performance index has reached the requirement of wooden medium density fibre board (MDF).
Embodiment 1
The preparation of crushed aggregates of straw, claim straw raw material 500kg, 1. straw is cut into the stalk unit of 30mm, impurity such as the broken leaf in the screening removal raw material, silt particle, 2. the stalk unit after the screening is through crusher in crushing, 3. the crushed aggregates of straw after the fragmentation screens through mechanical type again, 8 orders, 20 orders, 100 mesh sieves are told thick, fines second gear, wherein 8 orders＜coarse fodder＜20 orders, 2. 4. 20 orders＜fines＜100 orders will turn back to greater than 8 purpose crushed aggregates of straw; Get thick, thin each 100kg of crushed aggregates of straw and adopt the rotator type drying machine, baking temperature is got 100 ℃, makes crushed aggregates of straw moisture content 4%, in order to guarantee product fine and smooth surface is arranged, must make has a certain amount of fines in the raw material, top layer fines and its glue consumption of sandwich layer coarse fodder are inequality.So, to dried raw material show, sandwich layer separately is necessary.Adopt roto-siofter to carry out sorting, make fines send into the top layer feed bin, coarse fodder then enters the sandwich layer feed bin.Adopting homemade isocyanates is adhesive, and the resin added top layer is 6kg, and sandwich layer is 4.5kg, adds the waterproofing agent of 0.5kg during applying glue.Applying glue is finished in the ring type glue mixer.Even in order to ensure applying glue, the consumption proportioning that should guarantee adhesive and crushed aggregates of straw is a constant constant, making the raw material moisture content of mixing glue is 8%, the crushed aggregates of straw of mixing glue is with existing air-flowing type spreading machine, because crushed aggregates of straw density is lower, must control the uniformity of slab density well.Slab thickness after mating formation is 10cm, through precompressed, can reduce the thickness of slab, but improve the quality of slab, has also avoided the breakage in the transportation.Hot press adopts form of single sheet, uses releasing agent before hot pressing, for preventing haftplatte.160 ℃ of hot pressing temperatures, hot pressing time are 0.5min/mm, and hot pressing pressure is 2.5MPa.The sheet material of finishing after the hot pressing is placed on cooling under the normal temperature, and cooling purpose is that the temperature of sheet material is reduced, and eliminates the plate internal stress, prevents the plank distortion.Cooling back cutting edge, book size is 1220mm * 2440mm, the plate face specification of standard, stacking carried out sanding in 48 hours.
Embodiment 2
The preparation of crushed aggregates of straw, claim straw raw material 500kg, 1. straw is cut into the stalk unit of 50mm, impurity such as the broken leaf in the screening removal raw material, silt particle, 2. the stalk unit after the screening is through crusher in crushing, 3. the crushed aggregates of straw after the fragmentation screens through mechanical type again, 8 orders, 20 orders, 100 mesh sieves are told thick, fines second gear, wherein 8 orders＜coarse fodder＜20 orders, 2. 4. 20 orders＜fines＜100 orders will turn back to greater than 8 purpose crushed aggregates of straw; Get thick, thin each 100kg of crushed aggregates of straw and adopt the rotator type drying machine, baking temperature is got 100 ℃, makes crushed aggregates of straw moisture content 10%, in order to guarantee product fine and smooth surface is arranged, must make has a certain amount of fines in the raw material, top layer fines and its glue consumption of sandwich layer coarse fodder are inequality.So, to dried crushed aggregates of straw show, sandwich layer separately is necessary.Adopt roto-siofter to carry out sorting, make fines send into the top layer feed bin, coarse fodder then enters the sandwich layer feed bin.Adopting homemade isocyanates is adhesive, and the resin added top layer is 5kg, and sandwich layer is 5kg, adds the waterproofing agent of 1kg during applying glue.Applying glue is finished in the ring type glue mixer.Even in order to ensure applying glue, the consumption proportioning that should guarantee adhesive and crushed aggregates of straw is a constant constant, the raw material moisture content of mixing glue is 16%, and the raw material of mixing glue is with existing air-flowing type spreading machine, because crushed aggregates of straw density is lower, must control the uniformity of slab density well, slab thickness after mating formation is 13cm, through precompressed, can reduce the thickness of slab, but it has improved the quality of slab, has also avoided the breakage in the transportation.Adopt the hot press of double-deck form, before hot pressing, use demoulding backing plate, prevent haftplatte.170 ℃ of hot pressing temperatures, hot pressing time are 0.8min/mm, and hot pressing pressure is 3MPa.The sheet material of finishing after the hot pressing is placed on cooling under the normal temperature, and cooling purpose is that the temperature of sheet material is reduced, and eliminates the plate internal stress, prevents the plank distortion.Cooling back cutting edge, book size is 1220mm * 2440mm, the plate face specification of standard, stacking carried out sanding in 50 hours.The present invention produces median density straw board, detect through State Administration of Forestry's Nanjing wood-based plate quality monitoring testing station, density variation, moisture content, internal bond strength, MOR, elastic modelling quantity in its plate, hold the requirement that screw power all reaches indoor template in the GB/T11718-1999 standard, burst size of methanal reaches the requirement of A level in the GB/T11718-1999 standard, and the specific performance index is as follows:
Density 800-880kg/cm
3
Density variation in the plate+3.4 ,-2.2
Moisture content 4.1%
Internal bond strength 0.57MPa
MOR 28.5MPa
Elastic modelling quantity 2999MPa
Hold screw power (N) plate face 1570 edges of boards 1260
Burst size of methanal 1.7mg/100g
Claims (1)
1, the production method of median density straw board, it is characterized in that the preparation of its processing step branch (1) crushed aggregates of straw: the stalk unit that 1. straw is cut into 30-50mm, impurity such as the broken leaf in the screening removal raw material, silt particle, 2. the stalk unit after the screening is through crusher in crushing, 3. the crushed aggregates of straw after the fragmentation screens through mechanical type again, 8 orders, 20 orders, 100 mesh sieves, tell thick, fines second gear, 8 orders＜coarse fodder＜20 orders wherein, 2. 4. 20 orders＜fines＜100 orders will turn back to greater than 8 purpose crushed aggregates of straw; (2) drying: thick, thin crushed aggregates of straw is adopted rotator type drying machine drying, and baking temperature is 100-150 ℃, makes the moisture content of crushed aggregates of straw reach 3%-10%; (3) sorting: dried crushed aggregates of straw carries out sorting with roto-siofter again, makes fines send into the top layer feed bin, and coarse fodder then enters the sandwich layer feed bin; (4) glue mixing: glue mixing in the ring type glue mixer is an adhesive with isocyanates, and the resin added top layer is 5-6%, sandwich layer is 4-5%, will add waterproofing agent during applying glue, and waterproofing agent accounts for the 0.5-1% of crushed aggregates of straw weight, applying glue is even, and the crushed aggregates of straw moisture content of mixing glue is 8-16%; (5) mat formation: use the air-flowing type spreading machine, control the uniformity of slab density well, the slab thickness after mating formation be finished product median density straw board thickness 8-15 doubly; (6) hot pressing: press adopts the hot press of single or multiple lift form, need take to prevent the measure of haftplatte before the hot pressing, as using releasing agent, processing release paper or demoulding backing plate, hot pressing temperature is 140-170 ℃, hot pressing time is 0.5-0.8min/mm, and hot pressing pressure is 2.5-3.0Mpa; (7) post-processed: the sheet material after the hot pressing cools off at normal temperatures, and cutting edge becomes the plate face specification of standard then, and book size is 1220mm * 2440mm, and stacking carries out sanding after 48 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01137361 CN1128046C (en) | 2001-12-11 | 2001-12-11 | Process for preparing middle-density rice straw board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01137361 CN1128046C (en) | 2001-12-11 | 2001-12-11 | Process for preparing middle-density rice straw board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1356202A CN1356202A (en) | 2002-07-03 |
| CN1128046C true CN1128046C (en) | 2003-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01137361 Expired - Fee Related CN1128046C (en) | 2001-12-11 | 2001-12-11 | Process for preparing middle-density rice straw board |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100345668C (en) * | 2004-12-14 | 2007-10-31 | 郎妙金 | Bamboo-wood composite section bar production method |
| CN100364736C (en) * | 2005-06-20 | 2008-01-30 | 南京林业大学 | Industralized production and manufacture method for rice straw hollow flakeboard |
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| CN107984592A (en) * | 2017-11-27 | 2018-05-04 | 万华生态板业(信阳)有限公司 | The manufacture method and stalk-shaving board of stalk-shaving board |
| CN107932673B (en) * | 2017-11-27 | 2020-01-07 | 万华生态板业(信阳)有限公司 | Manufacturing method of straw shaving board and straw shaving board |
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-
2001
- 2001-12-11 CN CN 01137361 patent/CN1128046C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100345668C (en) * | 2004-12-14 | 2007-10-31 | 郎妙金 | Bamboo-wood composite section bar production method |
| CN100364736C (en) * | 2005-06-20 | 2008-01-30 | 南京林业大学 | Industralized production and manufacture method for rice straw hollow flakeboard |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1356202A (en) | 2002-07-03 |
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Granted publication date: 20031119 Termination date: 20101211 |