CN102896683A - Directed wood shaving board and preparation method thereof - Google Patents

Directed wood shaving board and preparation method thereof Download PDF

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Publication number
CN102896683A
CN102896683A CN2012104389039A CN201210438903A CN102896683A CN 102896683 A CN102896683 A CN 102896683A CN 2012104389039 A CN2012104389039 A CN 2012104389039A CN 201210438903 A CN201210438903 A CN 201210438903A CN 102896683 A CN102896683 A CN 102896683A
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CN
China
Prior art keywords
wood
wood shavings
oriented
chipboard
shavings
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CN2012104389039A
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Chinese (zh)
Inventor
王道江
刘小兵
邵学粉
张禄森
刘年祥
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江苏快乐木业集团有限公司
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Priority to CN2012104389039A priority Critical patent/CN102896683A/en
Publication of CN102896683A publication Critical patent/CN102896683A/en

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Abstract

The invention provides a preparation method of a directed wood shaving board. The preparation method comprises the following steps of: mixing wood shavings and an adhesion agent to obtain glue-blended wood shavings; paving the glue-blended wood shavings to obtain board blanks; and performing prepressing and laminated hot-pressing in sequence on the board blanks to obtain the directed wood shaving board. By laminating the board blanks together and then performing the hot-pressing, an adjustable range of pressure of the hot-pressing is enlarged, and high pressure can be supplied, so that the directed wood shaving board with high density can be obtained, and the mechanical strength of the directed wood shaving board is improved. According to experimental results, the rift grain static bending intensity of the directed wood shaving board is more than or equal to 50MPa, and the cross grain static bending intensity is more than or equal to 30MPa; the rift grain elasticity modulus is more than or equal to 5, 000MPa, and the cross grain elasticity modulus is more than or equal to 3, 000MPa; the internal bonding strength is more than or equal to 0.45MPa; and the directed wood shaving board can bear dynamic load which is more than or equal to 2.0T.

Description

A kind of oriented wood chipboard and preparation method thereof
Technical field
The present invention relates to building material technical field, relate in particular to a kind of oriented wood chipboard and preparation method thereof.
Background technology
Oriented wood chipboard (OSB) is a kind of product that is mainly used in substituting glued board in building industry, and it is with long narrow flat large wood shavings, the mutual vertical and orienting spreading of watch core layer after the glue mixing, and hot repressing forms after precompressed.When wood shavings are mated formation moulding, the glue mixing particieboard is arranged by its machine direction stringer, thus the particieboard that is pressed into.The shape need length-width ratio of this particieboard is larger, and the Thickness Ratio ordinary particle board is slightly thick.Its performance is similar to glued board, often replaces glued board to do structural wood and uses.
Prior art discloses multiple oriented wood chipboard, be that the Chinese patent of CN101332614A discloses a kind of burnishing surface wood oriented structure chipboard and its Manufacturing approach and use such as publication number, this particieboard is binded by surface layer, sandwich layer and bottom and forms, core structure formula wood oriented structure chipboard, surface layer and bottom are wooden fines layers.It is at the production line block of getting the raw materials ready of OSB, Wooden slice, grinding and fibre separation equipment have been increased, some wooden fineves are produced in manufacturing, enter applying glue by screening after the drying, then mat formation production line block and the back segment at OSB respectively increases by a joint spreading machine, OSB not the surface layer before the moulding and bottom increase one deck fines, then process through hot pressing and plain plate, make smooth smooth particieboard.The oriented wood chipboard of this patent disclosure has smooth smooth surface, but its mechanical strength is lower.
In order to improve the mechanical strength of oriented wood chipboard, publication number is that the Chinese patent of CN102198684A discloses a kind of oriented wood chipboard, this particieboard is that glued board is processed the three-decker that remaining rotary cut venner leftover pieces are bonded together by adhesive, comprise up and down two top layers and middle sandwich layer: the top layer wood shavings length of described particieboard is 40 ~ 170mm, top layer wood shavings width is 5 ~ 40mm, sandwich layer wood shavings length is 3 ~ 39mm, sandwich layer wood shavings width is 3 ~ 4mm, this invention is take the rotary cut venner leftover bits and pieces as raw material, the slab that obtains is carried out hot pressing by the mode of continuous rolling hot pressing, obtain the oriented shaving veneer.The method has been saved a large amount of timber, has reduced production cost, and has improved to a certain extent MOR and the elastic modelling quantity of the oriented wood chipboard that obtains.Yet adopt such hot pressing mode when intensified pressure, can produce the roller driving hard problem, so that the raising of pressure is limited, the oriented wood chipboard that obtains is when being used for the container boxboard, and its density, MOR and elastic modelling quantity can not satisfy the requirement for the container boxboard.Summary of the invention
The object of the present invention is to provide a kind of oriented wood chipboard and preparation method thereof, the oriented wood chipboard that method provided by the invention obtains has higher mechanical strength, is beneficial to its application.
The invention provides a kind of preparation method of oriented wood chipboard, may further comprise the steps:
Wood shavings are mixed with adhesive, obtain the glue mixing wood shavings;
Described glue mixing wood shavings are mated formation, obtain slab;
Described slab is carried out precompressed and laminating hot pressing successively, obtain oriented wood chipboard.
Preferably, the pressure of described laminating hot pressing is 2.6MPa ~ 3.7MPa.
Preferably, the temperature of described laminating hot pressing is 120 ℃ ~ 160 ℃.
Preferably, the time of described laminating hot pressing is 1500s ~ 1800s.
Preferably, in the described pavement process wood shavings are staggered along the directed lamination of its grain direction.
Preferably, the mass ratio of described wood shavings and adhesive is 100:(10 ~ 25).
Preferably, the mass ratio of described wood shavings and adhesive is 100:(15 ~ 20).
Preferably, the length of described wood shavings is 100mm ~ 130mm, and width is 10mm ~ 30mm, and thickness is 0.4mm ~ 0.6mm.
Preferably, described wood shavings comprise softwood wood shavings and hard material wood shavings, and described softwood is that air-dry density is less than 0.5g/cm 3Timber, described hard material is that air-dry density is more than or equal to 0.5g/cm 3Timber.
The invention provides a kind of oriented wood chipboard, prepared by the described method of technique scheme.
The invention provides a kind of oriented wood chipboard and preparation method thereof, method provided by the invention may further comprise the steps: wood shavings are mixed with adhesive, obtain the glue mixing wood shavings; Described glue mixing wood shavings are mated formation, obtain slab; Described slab is carried out precompressed and laminating hot pressing successively, obtain oriented wood chipboard.The present invention adopts plate blank layer is stacked the mode of carrying out again hot pressing, so that the adjustable extent of the pressure of hot pressing increases, has overcome the difficult problem of the excessive roller driving difficulty of pressure in the continuous rolling hot pressing mode.Method provided by the invention can provide larger pressure in the process of hot pressing, thereby obtains the oriented wood chipboard of higher density, and the mechanical strength of the oriented wood chipboard that obtains is improved.Experimental result shows, the rift grain MOR of the oriented wood chipboard that method provided by the invention obtains more than or equal to 50MPa, band MOR more than or equal to 30MPa; Its modulus of elasticity parellel to grain more than or equal to 5000MPa, tangential elastic module more than or equal to 3000MPa; Its internal bond strength is more than or equal to 0.45MPa; Can bear the dynamic load more than or equal to 2.0T.
Description of drawings
Fig. 1 is the structural representation of the oriented wood chipboard that obtains of the embodiment of the invention;
Fig. 2 is the schematic diagram of wood shavings arrangement mode in the oriented wood chipboard central layer that obtains of the embodiment of the invention.
The specific embodiment
The invention provides a kind of preparation method of oriented wood chipboard, may further comprise the steps:
Wood shavings are mixed with adhesive, obtain the glue mixing wood shavings;
Described glue mixing wood shavings are mated formation, obtain slab;
Described slab is carried out precompressed and laminating hot pressing successively, obtain oriented wood chipboard.
The present invention at first mixes wood shavings and adhesive, obtains the glue mixing wood shavings.The present invention does not have special restriction to the source of described wood shavings, material, size etc., adopts wood shavings well known to those skilled in the art to get final product;
The present invention studies show that, if the long quality of can impact mating formation of the length of wood shavings, so that wood shavings are mated formation is inhomogeneous, the intensity of the oriented wood chipboard that impact obtains; If the too short endoplasm pulling force that can affect the oriented wood chipboard that obtains of the length of wood shavings, the intensity of reduction product; The width of wood shavings is wide or cross narrow meeting and cause applying glue inhomogeneous, causes easily glue-line to be peeled off, so that bonding strength descends; The blocked up meeting of the thickness of wood shavings causes that interiors of products has the space, leakiness, the defectives such as density is low affect the intensity of product, therefore, in the present invention, preferred employing length is 100mm ~ 130mm, and width is 10mm ~ 30mm, and thickness is the wood shavings of 0.4mm ~ 0.6mm, the length of described wood shavings is 110mm ~ 125mm more preferably, most preferably is 115mm ~ 120mm; Width is 15mm ~ 22mm more preferably, most preferably is 18mm ~ 20mm; Thickness is 0.45mm ~ 0.55mm more preferably, most preferably is 0.48mm ~ 0.52mm.The oriented wood chipboard that adopts the wood shavings of above-mentioned size to obtain has higher density and bonding strength, thereby has further improved the mechanical property of oriented wood chipboard;
In the present invention, in order further to improve sheet material plasticity and the mechanical loading of oriented wood chipboard, preferred employing comprises the wood shavings of softwood and hard material, and in the present invention, described softwood refers to that its air-dry density is less than 0.5g/cm 3Timber, such as fast growing woods such as pine, poplars, in the present invention, described softwood be preferably the fast growing woods such as pine, poplar one or more, hard material refers to its air-dry density 〉=0.5g/cm 3Timber, such as beech, You Jiali, Marasse, clone or Eucalyptus etc., in the present invention, described hard material is preferably one or more in beech, You Jiali, Marasse, clone or the Eucalyptus; The quality optimization of described softwood wood shavings and hard material wood shavings is (10 ~ 25): (75 ~ 90), more preferably (15 ~ 20): (80 ~ 85);
The present invention does not have special restriction to the number of plies and the set-up mode thereof of wood shavings in the described central layer, adopt the number of plies and the set-up mode of wood shavings in the oriented wood chipboard well known to those skilled in the art to get final product, the present invention preferably arranges multilayer along its grain direction, staggered wood shavings in central layer.Adopt the described wood shavings of technique scheme of the present invention to make central layer, described wood shavings distribute uniformly, and have guaranteed that in the process of applying glue applying glue is even, can not cause peeling off of glue-line, have improved its bonding strength; Then the central layer that obtains and panel and base plate assembling are obtained oriented wood chipboard, the wood shavings of above-mentioned size are so that oriented wood chipboard provided by the invention has higher density, and have higher intensity, and can bear load-carrying greater than 7.26T used as the boxboard of container, be beneficial to its application.
In order further to improve tension effect and the bonding strength of oriented wood chipboard, in the present invention, described wood shavings preferably are staggered according to the mutual directed lamination of its grain direction, as shown in Figure 2, the arrangement mode of wood shavings in the oriented wood chipboard central layer that Fig. 2 provides for the embodiment of the invention, wherein 21 is wood shavings, as can be seen from Figure 2, in the present invention, described wood shavings are staggered along its grain direction lamination, have improved the compression strength of the oriented wood chipboard that obtains.
The present invention does not have special restriction to the preparation method of described wood shavings, adopts the technical scheme of wood shavings preparation well known to those skilled in the art to get final product.It is CARMANAH 34/114BLOCK DISC FLAKER(FORMERLY CAE that the present invention preferably adopts model) shaving machine of SOB/SERIAL NO.150-83 produces the wood shavings of above-mentioned size, in the process of producing above-mentioned wood shavings, the length of described charging juggle is preferably 800mm, and diameter is preferably 100mm ~ 600mm.
Behind the wood shavings that obtain, the present invention preferably carries out drying with described wood shavings, and the present invention does not have special restriction to the method for described drying, adopts the dry technology scheme of wood shavings well known to those skilled in the art to get final product.
After finishing the drying to wood shavings, the wood shavings of the drying that the present invention will obtain mix with adhesive, obtain the glue mixing wood shavings.The present invention does not have special restriction to the mass ratio of described wood shavings and adhesive, adopts the mass ratio of wood shavings well known to those skilled in the art and adhesive to get final product.The present invention studies show that, in the manufacturing process of oriented wood chipboard, causes bubbling if resin added is crossed conference, it is not firm that resin added is crossed small intensity, even can produce glue-line and peel off, and be easy to moisture absorption, thickness swelling rate is larger, so that product is out of shape easily, mechanical performance index is defective.Therefore, in the present invention, the mass ratio of described wood shavings and adhesive is preferably 100:(10 ~ 25), 100:(15 ~ 20 more preferably).The present invention preferably at first atomizes adhesive for adhesive is fully contacted with wood shavings, and adhesive and the wood shavings of the atomizing that then will obtain fully stir.The present invention does not have special restriction to described Choosing of adhesive, adopts adhesive well known to those skilled in the art to get final product, such as commercially available phenolic resins (PF) adhesive or urea-formaldehyde resin adhesive (UF) etc.; For wood shavings can better be contacted with adhesive, the present invention preferably mixes described adhesive with water, the Process of Applying Glue that the glue that obtains is used for wood shavings, the present invention does not have special restriction to the mass ratio of described adhesive and water, adopt that the mass ratio of adhesive and water gets final product in the glue well known to those skilled in the art, in the present invention, the mass ratio of described adhesive and water is preferably (39~48): (48~55), more preferably (42~45): (61~52); The present invention has good combination property for the oriented wood chipboard that makes preparation, preferably in adhesive, add curing agent, waterproofing agent, fire retardant, anticorrisive agent etc., then the mixture that obtains is mixed with wood shavings, obtain the glue mixing wood shavings, the present invention does not have special restriction to kind and the consumption of described curing agent, waterproofing agent, fire retardant, anticorrisive agent, adopts curing agent well known to those skilled in the art, waterproofing agent, fire retardant, anticorrisive agent to get final product.The present invention adopts the consumption of the binding agent of above-mentioned mass ratio, makes the oriented wood chipboard that obtains can not reduce its intensity because of imbibition under the prerequisite with stronger bonding strength.
After obtaining the glue mixing wood shavings, the present invention mats formation described glue mixing wood shavings, obtains slab.The present invention does not have special restriction to described method of mating formation, and adopts technical scheme of mating formation well known to those skilled in the art to get final product, and such as the method that can adopt mechanical orientation to mat formation, the method that also can adopt static to mat formation is mated formation described glue mixing wood shavings.In the present invention, in order to improve tension effect and the bonding strength of oriented wood chipboard, carrying out describedly when mating formation, preferably described wood shavings are being staggered along the directed lamination of its grain direction.
The present invention does not have special restriction to the material of mat formation used panel and base plate, size, number of plies etc. when mating formation, adopt panel and base plate in the oriented wood chipboard well known to those skilled in the art to get final product.In the present invention, described panel preferably includes 1 layer ~ 7 layers veneer, more preferably 3 layers ~ 5 layers; The top plate of described panel is preferably clone's veneer; The present invention does not have special restriction to the material of described veneer, size etc., adopt the veneer of panel in the preparation oriented wood chipboard well known to those skilled in the art to get final product, in the present invention, the thickness of described veneer is preferably 0.8mm ~ 2.0mm, 1.0mm ~ 1.8mm more preferably, the material of described veneer can also can be horse traction silk, pine, birch, eucalyptus for cloning wood, one or more in glue wood and the fast growing wood.Clone a little less than the wooden gloss, without special flavour, the resin smell is often arranged, texture usually straight, structure omits thick; Slightly evenly; Natural defect seldom; Heavy to omiting in the timber weight, bronzing; The horse traction silk is that a kind of wood grain is attractive in appearance, has the timber of certain degree of hardness;
In the present invention, described base plate preferably includes 1 layer ~ 7 layers veneer, more preferably 3 layers ~ 5 layers; The top plate of described panel is preferably clone's veneer; The present invention does not have special restriction to the material of described veneer, size etc., adopt the veneer of panel in the preparation oriented wood chipboard well known to those skilled in the art to get final product, in the present invention, the thickness of described veneer is preferably 0.8mm ~ 2.0mm, 1.0mm ~ 1.8mm more preferably, the material of described veneer can also can be horse traction silk, pine, birch, eucalyptus for cloning wood, one or more in glue wood and the fast growing wood.Clone a little less than the wooden gloss, without special flavour, the resin smell is often arranged, texture usually straight, structure omits slightly, and slightly evenly, natural defect seldom weighs bronzing to omiting in the timber weight; The horse traction silk is that a kind of wood grain is attractive in appearance, has the timber of certain degree of hardness, and when the base plate that adopts above-mentioned material and/or panel, the oriented wood chipboard of preparation has higher intensity, is beneficial to its application.In the present invention, the material of described panel and described base plate can be identical, also can be different; The number of plies of the veneer that described panel and described base plate comprise can be the same or different.
After obtaining slab, the present invention carries out after the precompressed again laminating hot pressing with described slab, obtains oriented wood chipboard.The present invention does not have special restriction to the method for described precompressed, adopts the technical scheme of precompressed well known to those skilled in the art to get final product.In the present invention, in order to obtain larger hot pressing pressure to improve the density of oriented wood chipboard, thereby improve its mechanical property, the mode of laminating hot pressing of the present invention is carried out hot pressing to described slab, stacked placement after the slab precompressed that is about to obtain, then exert pressure in its vertical direction, the method of this laminating hot pressing has overcome in the continuous rolling hot pressing because the excessive difficult problem that causes the roller driving difficulty of pressure, and this hot pressing mode has larger pressure adjustable range, improve the density of oriented wood chipboard, thereby improved its mechanical strength.In the present invention, the pressure of described laminating hot pressing is preferably 2.6MPa ~ 3.7MPa, more preferably 2.8MPa ~ 3.5MPa; The temperature of described laminating hot pressing is preferably 120 ℃ ~ 160 ℃, more preferably 125 ℃ ~ 150 ℃; The time of described laminating hot pressing is preferably 1500s ~ 1800s, more preferably 1600s ~ 1750s;
After finishing the hot pressing to slab, in order to obtain for commercially available commodity, the present invention will obtain preferably that product cools off, cutting edge, polishing, check, minute etc. processing.The present invention does not have special restriction to described cooling, cutting edge, polishing, the method for checking, grade, and the technical scheme of adopt cooling well known to those skilled in the art, cutting edge, polishing, checking, grade gets final product.Can in the device of sealing, adopt force ventilated method such as cooling processing, also available gravity-flow ventilation cooling, the cooling device of employing can be star cooler; Requirement according to the commodity size is carried out cutting edge to the product that obtains, and can adopt to unite in length and breadth Sawing machine product is carried out cutting edge; Polishing can reduce the thickness deviation of plate, eliminates surface defects, makes the plate face bright and clean, and is easy to use and carry out incrustation, can adopt broadband type abrasive finishing machine abrasive to polish processing; Grinded sheet material can obtain the commercial goods through grading, checking.
The invention provides a kind of oriented wood chipboard, prepared by the described method of technique scheme, the structure of described oriented wood chipboard is referring to Fig. 1, the structural representation of the oriented wood chipboard that Fig. 1 provides for the embodiment of the invention, wherein 1 is panel, 2 is central layer, 2a is the wood shavings end face, 2b is the wood shavings end face, and 2c is the wood shavings side, and 3 is base plate.
The invention provides a kind of oriented wood chipboard and preparation method thereof, method provided by the invention may further comprise the steps: wood shavings are mixed with adhesive, obtain the glue mixing wood shavings; Described glue mixing wood shavings are mated formation, obtain slab; Described slab is carried out precompressed and laminating hot pressing successively, obtain oriented wood chipboard.The present invention adopts plate blank layer is stacked the mode of carrying out again hot pressing, so that the adjustable extent of the pressure of hot pressing increases, has overcome the difficult problem of the excessive roller driving difficulty of pressure in the continuous rolling hot pressing mode.Method provided by the invention can provide larger pressure in the process of hot pressing, thereby obtains the oriented wood chipboard of higher density, and the mechanical strength of the oriented wood chipboard that obtains is improved.Experimental result shows, the rift grain MOR of the oriented wood chipboard that method provided by the invention obtains more than or equal to 50MPa, band MOR more than or equal to 30MPa; Its modulus of elasticity parellel to grain more than or equal to 5000MPa, tangential elastic module more than or equal to 3000MPa; Its internal bond strength is more than or equal to 0.45MPa; Can bear the dynamic load more than or equal to 2.0T.
In order to further specify the present invention, below in conjunction with embodiment oriented wood chipboard provided by the invention and preparation method thereof is described in detail, but they can not be interpreted as restriction to protection domain of the present invention.
The adhesive of using among the following embodiment of being is available from branch company of this group.
Embodiment 1
It is that 120mm, width are that 20mm and thickness are the wood shavings of 0.5mm that length is provided, according to the mass ratio of wood shavings and adhesive be 100:18 adhesive is sprayed and atomizing on the surface of wood shavings, finish the glue-applying technique to wood shavings; Adopt spreading machine along wood shavings grain direction mutual orientation stacked arrangement the wood shavings that mix with adhesive that obtain, wood shavings are mated formation, obtain slab; The slab that obtains is carried out after the precompressed stacked together, exert pressure in its vertical direction and to carry out laminating hot pressing, the pressure of hot pressing is 2.9MPa~3.3MPa, and temperature is 135 ℃~145 ℃, and the time is 1650s~1700s, obtains oriented wood chipboard.
The present invention carries out performance test with the oriented wood chipboard that obtains, density is measured according to the method for 4.2 records among the GB GB/T17657-1999, moisture content is measured according to the method for 4.3 records among the GB GB/T 17657-1999 " Test methods of evaluating the properties of woodbased panels and surface decorated woodbased panels ", thickness swelling rate is measured according to the method for 4.5 records among the GB/T 17657-1999 " Test methods of evaluating the properties of woodbased panels and surface decorated woodbased panels ", internal bond strength is measured according to the method for the record of 4.8 among the GB GB/T 17657-1999, MOR and elastic modelling quantity are measured according to the method for 4.9 records among the GB GB/T 17657-1999, the result is as shown in table 1, the performance test results of the oriented wood chipboard that table 1 obtains for the embodiment of the invention 1 ~ 5.
The present invention carries out deep processing with the oriented wood chipboard that obtains, and is processed into the oriented wood chipboard boxboard, uses it for the bottom of container.The present invention has carried out performance test with the boxboard that obtains, and the result is as shown in table 2, the performance test results of the boxboard that table 2 obtains for the embodiment of the invention 1 ~ 5.
Embodiment 2
It is that 110mm, width are that 15mm and thickness are the wood shavings of 0.45mm that length is provided, and being 100:15 according to the mass ratio of wood shavings and adhesive is sprayed at the surface of wood shavings with adhesive, finishes the glue-applying technique to wood shavings; Adopt spreading machine along wood shavings grain direction mutual orientation stacked arrangement the wood shavings that mix with adhesive that obtain, wood shavings are mated formation, obtain slab; The slab that obtains is carried out after the precompressed stacked together, exert pressure in its vertical direction and to carry out stacked hot repressing, the pressure of hot pressing is 2.7MPa~3.1MPa, and temperature is 130 ℃~140 ℃, and the time is 1600s~1650s, obtains oriented wood chipboard.
The present invention carries out performance test with the oriented wood chipboard that obtains, density is measured according to the method for 4.2 records among the GB GB/T17657-1999, moisture content is measured according to the method for 4.3 records among the GB GB/T 17657-1999 " Test methods of evaluating the properties of woodbased panels and surface decorated woodbased panels ", thickness swelling rate is measured according to the method for 4.5 records among the GB/T 17657-1999 " Test methods of evaluating the properties of woodbased panels and surface decorated woodbased panels ", internal bond strength is measured according to the method for the record of 4.8 among the GB GB/T 17657-1999, MOR and elastic modelling quantity are measured according to the method for 4.9 records among the GB GB/T 17657-1999, the result is as shown in table 1, the performance test results of the oriented wood chipboard that table 1 obtains for the embodiment of the invention 1 ~ 5.
The present invention carries out deep processing with the oriented wood chipboard that obtains, and is processed into the oriented wood chipboard boxboard, uses it for the bottom of container.The present invention has carried out performance test with the boxboard that obtains, and the result is as shown in table 2, the performance test results of the boxboard that table 2 obtains for the embodiment of the invention 1 ~ 5.
Embodiment 3
It is that 125mm, width are that 25mm and thickness are the wood shavings of 0.55mm that length is provided, and being 100:20 according to the mass ratio of wood shavings and adhesive is sprayed at the surface of wood shavings with adhesive, finishes the glue-applying technique to wood shavings; Adopt spreading machine along wood shavings grain direction mutual orientation stacked arrangement the wood shavings that mix with adhesive that obtain, wood shavings are mated formation, obtain slab; The slab that obtains is carried out after the precompressed stacked together, exert pressure in its vertical direction and to carry out laminating hot pressing, the pressure of hot pressing is 3.1MPa~3.5MPa, and temperature is 135 ℃~145 ℃, and the time is 1700s~1750s, obtains oriented wood chipboard.
The present invention carries out performance test with the oriented wood chipboard that obtains, density is measured according to the method for 4.2 records among the GB GB/T17657-1999, moisture content is measured according to the method for 4.3 records among the GB GB/T 17657-1999 " Test methods of evaluating the properties of woodbased panels and surface decorated woodbased panels ", thickness swelling rate is measured according to the method for 4.5 records among the GB/T 17657-1999 " Test methods of evaluating the properties of woodbased panels and surface decorated woodbased panels ", internal bond strength is measured according to the method for the record of 4.8 among the GB GB/T 17657-1999, MOR and elastic modelling quantity are measured according to the method for 4.9 records among the GB GB/T 17657-1999, the result is as shown in table 1, the performance test results of the oriented wood chipboard that table 1 obtains for the embodiment of the invention 1 ~ 5.
The present invention carries out deep processing with the oriented wood chipboard that obtains, and is processed into the oriented wood chipboard boxboard, uses it for the bottom of container.The present invention has carried out performance test with the boxboard that obtains, and the result is as shown in table 2, the performance test results of the boxboard that table 2 obtains for the embodiment of the invention 1 ~ 5.
Embodiment 4
It is that 100mm, width are that 10mm and thickness are the wood shavings of 0.4mm that length is provided, and being 100:22 according to the mass ratio of wood shavings and adhesive is sprayed at the surface of wood shavings with adhesive, finishes the glue-applying technique to wood shavings; Adopt spreading machine along wood shavings grain direction mutual orientation stacked arrangement the wood shavings that mix with adhesive that obtain, wood shavings are mated formation, obtain slab; The slab that obtains is carried out after the precompressed stacked together, exert pressure in its vertical direction and to carry out laminating hot pressing, the pressure of hot pressing is 2.6MPa~3.0MPa, and temperature is 125 ℃~135 ℃, and the time is 1500s~1600s, obtains oriented wood chipboard.
The present invention carries out performance test with the oriented wood chipboard that obtains, density is measured according to the method for 4.2 records among the GB GB/T17657-1999, moisture content is measured according to the method for 4.3 records among the GB GB/T 17657-1999 " Test methods of evaluating the properties of woodbased panels and surface decorated woodbased panels ", thickness swelling rate is measured according to the method for 4.5 records among the GB/T 17657-1999 " Test methods of evaluating the properties of woodbased panels and surface decorated woodbased panels ", internal bond strength is measured according to the method for the record of 4.8 among the GB GB/T 17657-1999, MOR and elastic modelling quantity are measured according to the method for 4.9 records among the GB GB/T 17657-1999, the result is as shown in table 1, the performance test results of the oriented wood chipboard that table 1 obtains for the embodiment of the invention 1 ~ 5.
The present invention carries out deep processing with the oriented wood chipboard that obtains, and is processed into the oriented wood chipboard boxboard, uses it for the bottom of container.The present invention has carried out performance test with the boxboard that obtains, and the result is as shown in table 2, the performance test results of the boxboard that table 2 obtains for the embodiment of the invention 1 ~ 5.
Embodiment 5
It is that 130mm, width are that 30mm and thickness are the wood shavings of 0.6mm that length is provided, and being 100:14 according to the mass ratio of wood shavings and adhesive is sprayed at the surface of wood shavings with adhesive, finishes the glue-applying technique to wood shavings; Adopt spreading machine along wood shavings grain direction mutual orientation stacked arrangement the wood shavings that mix with adhesive that obtain, wood shavings are mated formation, obtain slab; The slab that obtains is carried out after the precompressed stacked together, exert pressure in its vertical direction and to carry out laminating hot pressing, the pressure of hot pressing is 3.3MPa~3.7MPa, and temperature is 145 ℃~160 ℃, and the time is 1750s~1800s, obtains oriented wood chipboard.
The present invention carries out performance test with the oriented wood chipboard that obtains, density is measured according to the method for 4.2 records among the GB GB/T17657-1999, moisture content is measured according to the method for 4.3 records among the GB GB/T 17657-1999 " Test methods of evaluating the properties of woodbased panels and surface decorated woodbased panels ", thickness swelling rate is measured according to the method for 4.5 records among the GB/T 17657-1999 " Test methods of evaluating the properties of woodbased panels and surface decorated woodbased panels ", internal bond strength is measured according to the method for the record of 4.8 among the GB GB/T 17657-1999, MOR and elastic modelling quantity are measured according to the method for 4.9 records among the GB GB/T 17657-1999, the result is as shown in table 1, the performance test results of the oriented wood chipboard that table 1 obtains for the embodiment of the invention 1 ~ 5.
The present invention carries out deep processing with the oriented wood chipboard that obtains, and is processed into the oriented wood chipboard boxboard, uses it for the bottom of container.The present invention has carried out performance test with the boxboard that obtains, and the result is as shown in table 2, the performance test results of the boxboard that table 2 obtains for the embodiment of the invention 1 ~ 5.
The performance test results of the oriented wood chipboard that table 1 embodiment of the invention 1 ~ 5 obtains.
As can be seen from Table 1, oriented wood chipboard provided by the invention has higher MOR and elastic modelling quantity, can bear the load-carrying above 2.0T, is beneficial to its application.
The performance test results of the boxboard that table 2 embodiment of the invention 1 ~ 5 obtains
As can be seen from Table 2, when oriented wood chipboard provided by the invention is used as the container boxboard, can bear the load-carrying above 7.26T, have higher using value.
As seen from the above embodiment, the invention provides a kind of oriented wood chipboard and preparation method thereof, method provided by the invention may further comprise the steps: wood shavings are mixed with adhesive, obtain the glue mixing wood shavings; Described glue mixing wood shavings are mated formation, obtain slab; Described slab is carried out precompressed and laminating hot pressing successively, obtain oriented wood chipboard.The present invention adopts plate blank layer is stacked the mode of carrying out again hot pressing, so that the adjustable extent of the pressure of hot pressing increases, has overcome the difficult problem of the excessive roller driving difficulty of pressure in the continuous rolling hot pressing mode.Method provided by the invention can provide larger pressure in the process of hot pressing, thereby obtains the oriented wood chipboard of higher density, and the mechanical strength of the oriented wood chipboard that obtains is improved.Experimental result shows, the rift grain MOR of the oriented wood chipboard that method provided by the invention obtains more than or equal to 50MPa, band MOR more than or equal to 30MPa; Its modulus of elasticity parellel to grain more than or equal to 5000MPa, tangential elastic module more than or equal to 3000MPa; Its internal bond strength is more than or equal to 0.45MPa; Can bear the dynamic load more than or equal to 2.0T.
The above only is preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (10)

1. the preparation method of an oriented wood chipboard may further comprise the steps:
Wood shavings are mixed with adhesive, obtain the glue mixing wood shavings;
Described glue mixing wood shavings are mated formation, obtain slab;
Described slab is carried out precompressed and laminating hot pressing successively, obtain oriented wood chipboard.
2. preparation method according to claim 1 is characterized in that, the pressure of described laminating hot pressing is 2.6MPa ~ 3.7MPa.
3. preparation method according to claim 1 is characterized in that, the temperature of described laminating hot pressing is 120 ℃ ~ 160 ℃.
4. preparation method according to claim 1 is characterized in that, the time of described laminating hot pressing is 1500s ~ 1800s.
5. preparation method according to claim 1 is characterized in that, in the described pavement process wood shavings is staggered along the directed lamination of its grain direction.
6. preparation method according to claim 1 is characterized in that, the mass ratio of described wood shavings and adhesive is 100:(10 ~ 25).
7. preparation method according to claim 6 is characterized in that, the mass ratio of described wood shavings and adhesive is 100:(15 ~ 20).
8. preparation method according to claim 1 is characterized in that, the length of described wood shavings is 100mm ~ 130mm, and width is 10mm ~ 30mm, and thickness is 0.4mm ~ 0.6mm.
9. preparation method according to claim 1 is characterized in that, described wood shavings comprise softwood wood shavings and hard material wood shavings, and described softwood is that air-dry density is less than 0.5g/cm 3Timber, described hard material is that air-dry density is more than or equal to 0.5g/cm 3Timber.
10. an oriented wood chipboard is prepared by the described method of claim 1 ~ 9 any one.
CN2012104389039A 2012-11-06 2012-11-06 Directed wood shaving board and preparation method thereof CN102896683A (en)

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