Method for manufacturing of material boards and material board
FIELD: technological processes.
SUBSTANCE: method for manufacturing of boards from chip or fibre material, in particular chip boards, LDF, MDF, HDF and OSB boards, includes the following stages: (S2) - production of dried chip or fibre material, (S3a, S3b) - plasma treatment of dried chip or fibre material, (S4a, S4b) - application of glue onto plasma-processed chip or fibre material and (S5) - pressing chip or fibre material, on which glue is applied into boards. Technological gas used at stage (S3a, S3b) of plasma treatment contains fluorine as additional component. Board contains not more than 50 kg of hard glue per cubic metre.
EFFECT: invention improves quality of boards.
13 cl, 1 dwg
The invention relates to a method of fabrication of the strand or fiber material, in particular particle boards, plates LDF (low density fiberboard - fibrous plates of low density), MDF (medium density fiberboard - fibrous plates medium density), plates HDF (high density fiberboard - fibrous plates of high density) and OSB boards (oriented strandboard bonded slabs of oriented planar chip, oriented strand Board).
In the known generic method of manufacturing particle boards formed, for example, when processing wood chips are first dried and then sorted by size, for example into two classes, namely large shavings of the inner layer and small chips of the outer layer, and either stored separately or sent directly for further processing. Usually then the chips glue is applied, and it is scattered on the conveyor belt so that the chips of the outer layer is located outside, and shaving the inner layer is in the middle of the non-compacted particle bed, which finally pressed in a continuous process in the plate through the belt press.
Also in the manufacture of fiber boards, such as MDF or HDF boards, do the same, and, however, there is no division into chips of the outer layer and the chips of the inner layer, although fibers are usually formed and the mixture specified share of a given type of fiber.
Usually to achieve the desired mechanical strength properties, such as particle boards, their cubic meter of volume it takes about 90 kg of liquid adhesive, after curing corresponds to approximately 60 kg of solid glue. Such quantities of glue are an important cost factor in the manufacture of the plates.
The objective of the invention is to provide a method of fabrication of the strand or fiber material which would provide a more cost-effective production compared to traditional methods.
This problem is solved by a method of the above kind, which includes the following steps: obtaining the dried strand or fiber material, a plasma processing dried strand or fiber material, applying adhesive to the treated plasma particle or fibrous material and the extrusion strand or fiber material to which applied the glue to the plate.
The crucial difference between the proposed and known methods is, therefore, that the dried strand or fiber material before applying the glue on it is subjected to plasma processing as an additional stage. In this plasma processing between two electrodes to which is applied the high voltage ionizes technologists is a mini gas. The dried chips or fibers processed by the plasma process gas, or forcing them to pour through the plasma, or skipping through the plasma free-poured, for example on the conveyor. In any case, the ions depending on their kinetic energy penetrate into the surface of the chips or fibers, namely to a depth of, for example, up to 10 μm. It causes physical and chemical changes on the surface of chips or fibers are not yet explained. However, it is a scientifically proven fact that this treatment causes improved adhesion surface, so as preferably covered with an adhesive layer better stick to the thus treated surface of the chips or fibers.
It is well known that surface properties can be influenced by plasma treatment. However, it is not expected that this will affect the adhesion of the adhesive with the processed plasma surface chips or fibers, and in addition also to improve it. In addition, it was not meant that arise unexpectedly improved adhesion will remain on for the length of time is important for the service life of the plates and are made from these products. Finally also not expected that the improvement of adhesion will occur and will remain in such an extent that savings are used in the manufacture of glue boards will justify the investment and exploitation installation costs for plasma processing. The merit of the inventors is that they are not considered with all these doubts.
It turned out that due to the first seem unnecessary, additional and costly step of plasma processing for further processing of strand or fiber material in an unexpected way arises the advantage that subsequent application of adhesive to the treated plasma shavings or fibers can be substantially less adhesive than traditional methods, and made the suggested way slabs, despite the smaller amount of glue used, however, meet the mechanical requirements in accordance with the applicable individual plates industrial norms. As the economy of adhesive used per cubic meter of the material of the plates, much higher than that allocated to the production of this cubic meter of the material of the plates of the investment costs, the plate more cost-effective in the manufacture of the proposed method.
In particular, it was found that in a cubic meter of material plates require no more than 75 kg, mostly not more than 67 kg, liquid adhesive, after curing corresponds to not more than 50 kg, mostly not more than 45 kg, solid glue. Compared with the traditional methods is equivalent to a saving of glue over 15%, mainly more than 25%. is one preferred embodiment of the invention is achieved savings glue even about 30%, which corresponds to the use of 65 kg of liquid glue or approximately 42 kg of solid glue. Due to such large savings glue can significantly reduce the cost of manufacturing plates of the proposed method.
Step plasma treatment of the dried strand or fiber material can be implemented, for example, due to the fact that periodically the specified number of strand or fiber material is exposed in the low-pressure chamber to the influence of low-pressure plasma. Due to this strand or fiber material is processed by the plasma is uniform, i.e. all surfaces of all individual chips or fibers, so then the surface properties are uniform throughout the particle or fibrous material. Alternatively, it can also continuously moved past the nozzle device under atmospheric pressure plasma.
In both of the alternative methods used in plasma processing process gas may contain as the main component, the oxygen and/or nitrogen and/or argon. When using a low-pressure plasma for plasma treatment as the process gas can be used, for example, air, allowing you to eliminate time-consuming vacuum chamber low pressure before entering techno is oricheskogo gas, as the pressure in the chamber after the input has to be reduced to only necessary for the plasma process values (on the order of 0.5-5 mbar).
In one embodiment of the invention used in a plasma processing process gas may contain as an additional component of the fluorine. It was found that preferably by adding to the process gas fluoride can affect the swelling properties of the chips or fibers under the influence of moisture, i.e. you can reduce the swelling shavings or fibers under the influence of moisture. This leads to a significantly higher resistance made so plates to moisture. Typically in the manufacture of chipboard to reduce unwanted swelling is added to the paraffin wax. Due to the plasma treatment containing fluorine process gas can be completely or at least partially abandon the use of paraffin wax. This provides further reduce costs.
The duration of plasma treatment strand or fiber material is predominantly from 1 to 10 minutes. Because of this, when the maximum flow rate of strand or fiber material can be achieved fairly good surface properties shavings or fibers.
In one embodiment of the invention p is edlozano, that strand or fiber material before plasma treatment is divided into several groups, differing in the size of the individual chips or fibers. In addition, different groups can be processed by the plasma, and then they can be applied glue separately, before they are again United to the pressing plate. Due to this, for example in the manufacture of chipboard, you can ensure that a small chip of the outer layer, and large shavings of the inner layer during plasma processing can be used, respectively, the optimal operating parameters, allowing you to achieve maximum economy of glue.
Mainly between stages plasma processing strand or fiber material and the adhesive may take no more than 30 minutes, particularly preferably not more than 1 minute to ensure that improved by plasma treatment of the surface properties of strand or fiber material will not deteriorate due to long time storage.
Used according to the invention strand or fiber material can include wood chips and/or wood fibers, and/or hemp fibers, and/or straw fibers, so that can be produced not only different types of slabs of wood material, such as shaving the lita plate LDF, MDF, HDF and OSB, and panels that contain hemp fiber and/or straw fibers.
Adhesive can be used, for example, urea-formaldehyde resin or urea-melamine-formaldehyde resin or phenol-formaldehyde resin, preferably with a solids content of 40 to 80%.
In one embodiment of the invention can be provided that during the plasma processing process gas can be introduced in addition to the fluorine well as other substances, for example, to produce slabs with fire protection properties, and/or antibacterial properties, and/or with a reduced tendency to the formation of mold.
The invention relates also to a slab of particle Board or fiber material, in particular the chipboard, plate LDF, MDF Board, HDF and OSB containing per cubic meter not more than 50 kg, mostly not more than 45 kg, solid glue. When this strand or fiber material can include wood chips and/or wood fibers, and/or hemp fibers, and/or straw fibers. Next, the adhesive may contain urea-formaldehyde or urea-melamine-formaldehyde or phenol-formaldehyde resin, preferably with a solids content of 40 to 80%.
Below the preferred implementation of the ISO is retene is illustrated by the example with the accompanying drawing, which depicts a block diagram illustrating the proposed method of manufacture of chip boards.
Shown in the drawing, the preferred embodiment of the invention, first at step S1 to traditional shaving machine serves logs, wood chips, wood waste, etc.
At step S2 supplied timber is processed using a shaving machine in chips, which is dried in conventional drying unit, such as a drum dryer to a residual moisture content of about 2%, and then subjected to screening, resulting in small chips, which later will be used as the chip outer layer particle Board, is separated from the larger chips used later as a chip inner layer chipboard.
At both stages of the proposed method does not differ from traditional methods of fabrication of the strand or fiber material, and for the proposed method is also completely irrelevant, how exactly will happen getting dried strand or fiber material. It is also possible to turn to shaving and drying did not occur immediately on the spot, and dried strand or fiber material shipped from a warehouse.
At step S3a chips of the outer layer is loaded in the camera low pressure is Oia, then air is pumped to the working pressure of 0.5 to 5 mbar. As soon as it reached the working pressure in the chamber is ignited plasma, and in this case remaining in the chamber of the low pressure air is used as the process gas. However, you can also use other process gases, such as argon, and/or enter in the used process gas, one or more additives, such as fluoride. Plasma processing, during which the chips of the outer layer is exposed to plasma, lasts from 1 to 10 minutes.
At step S3b chips of the inner layer is treated with plasma is similar to step S3a. Individual plasma processing chip of the outer and inner layers has the advantage that, on the one hand, the process parameters such as working pressure, duration of treatment and the composition and/or concentration of the process gas can be individually paired with this type of chip, and on the other hand, various additives can be incorporated in this process gas in suitable composition and concentration for each individual type of chip.
Following the steps S3a, S3b on the steps S4a, S4b chips are the outer and inner layers separately applied adhesive. As the bonding means is applied, as in the traditional ways of making struzhechnaja, urea-formaldehyde, urea-melamine-formaldehyde or phenol-formaldehyde resin.
Because plasma processing chips has been improved wetting of their surfaces, you can use about 30% less adhesive than traditional methods for the production of particle boards, and mechanical strength properties of the finished chipboard due will not be harmed. While traditional methods require about 90 kg of liquid adhesive per cubic meter boards to make them required in accordance with industry standards mechanical strength properties, the proposed method allows to manage the ideal way about 63 kg of liquid adhesive per cubic meter boards. This is a significant cost savings already justifies, thus, additional costs, and the additional working step plasma treatment of the plates in the proposed method of their manufacture.
In addition, by suitable additives in the process gas during plasma processing can preferably also be affected by other properties of the chips. The addition of fluorine has, for example, the preferred influence on the swelling properties of the chips, so that it is possible to withdraw completely or partially from the usual still supplements paraffin emulsion is AI in the manufacture of chipboard to reduce swelling of the finished plate, and thus, to achieve further cost reduction.
After applying glue to the step S5 shavings outer and inner layers crumbles together on the conveyor belt so that the surface of the formed layer composed of a non-compacted chips of the outer layer, which is applied the glue and shaving the inner layer are located inside this layer. Finally, the chips are pressed and heated, for example in traditional tape media, to obtain chipboard.
In the proposed method is completely irrelevant, as separately will be conventional and known in themselves phases locations shavings and pressing. Thus there any way to connect the layers and pressing chips, which caused the glue is usually used in the manufacture of slabs of strand or fiber material.
1. The method of fabrication of the strand or fiber material, in particular particle boards, plates LDF, MDF, HDF boards and OSB plates, comprising the following steps:
(S2): getting dried strand or fiber material;
(S3a, S3b): plasma processing dried strand or fiber material;
(S4a, S4b): applying the adhesive to the treated plasma particle or fibrous material;
(S5): pressing strand or fiber material, catarinense glue, in plates,
characterized in that in stage (S3a, S3b) plasma treatment process gas contains as an additional component of fluoride.
2. The method according to claim 1, characterized in that in stage (S4a, S4b) applying adhesive on each cubic meter boards use no more than 75 kg, mostly not more than 67 kg, liquid glue or not more than 50 kg, mostly not more than 45 kg, solid glue.
3. The method according to claim 1, characterized in that used in step (S3a, S3b) plasma treatment process gas contains as the main component, the oxygen and/or nitrogen and/or argon.
4. The method according to claim 1, characterized in that the specified number of strand or fiber material periodically treated with plasma of low pressure.
5. The method according to claim 4, characterized in that the duration of stage (S3a, S3b) plasma treatment strand or fiber material is from 1 to 10 minutes
6. The method according to any one of claims 1 to 5, characterized in that the strand or fiber material before plasma treatment (S3a, S3b) are divided into several groups, differing in the size of the individual chips or fibers, with different groups treated with plasma (S3a, S3b), and then put glue on them individually, before they again unite for pressing (S5) in the oven.
7. The method according to claim 1, characterized in that between stage (S3a, S3b) PLA is constant processing strand or fiber material and step (S4a, S4b) applying the adhesive on it is not more than 30 minutes, mostly not more than 1 minutes
8. The method according to claim 1, characterized in that the strand or fiber material includes wood chips and/or wood fibers, and/or hemp fibers, and/or straw fibers.
9. The method according to claim 1, characterized in that in stage (S4a, S4b) apply adhesive using urea-formaldehyde or urea-melamine-formaldehyde or phenol-formaldehyde resin, preferably with a solids content of 40 to 80%.
10. Slab of particle Board or fiber material, in particular bonded plate, LDF, MDF Board, HDF and OSB, for example, manufactured by the method according to any one of claims 1 to 9, characterized in that it contains per cubic meter not more than 50 kg of solid glue.
11. The stove of claim 10, characterized in that it contains per cubic meter not more than 45 kg of solid glue.
12. The stove of claim 10, wherein the strand or fiber material includes wood chips and/or wood fibers, and/or hemp fibers, and/or straw fibers.
13. Stove according to any one of p-12, characterized in that the adhesive (S4a, S4b) contains urea-formaldehyde or urea-melamine-formaldehyde or phenol-formaldehyde resin, preferably with a solids content of 40 to 80%.
FIELD: process engineering.
SUBSTANCE: invention relates to production of construction and heat insulation materials. Proposed complex comprises crusher, hopper, mixer, reed powder hopper, reed powder feed conveyor for production sandwich panels with vacuum-powder insulation or materials made from cheff or reed powder heated to 190-200°C to separate resin-based adhesive, rolls, molds and acclimatizator heated to over 200°C and oscillating at preset rate, and arranged under said conveyor. Note here that hopper is furnished with mixer and hot water circulation jacket and jacket with branch pipe to feed heat carrier and to dry cheff to 90-95°C. Mixer is communicated with vertical heated mill furnished with hot water circulation jacket.
EFFECT: production of new heat insulation material.
2 cl, 6 dwg
SUBSTANCE: invention is related to epoxide-wood composition for production of pressed boards used to cover foam polystyrene plates from external and internal sides on glue in order to protect them against external impact and to increase their service life. Composition includes the following components, with their following ratio, wt %: 37.2-43.5 of epoxide-diane resin ED-20, 3.7-4.3 of amine hardener of polyethylene polyamine, 43-52.1 of pine woodchip filler, 6.3-11.9 of polymer filler. Polymer filler used in composition is foam polystyrene chips - wastes of heat insulation production.
EFFECT: invention makes it possible to increase physical and mechanical characteristics of composition, to recycle wastes of wood processing and heat insulation materials.
2 tbl, 3 dwg
FIELD: technological processes.
SUBSTANCE: invention is intended for woodworking and construction industry, and also environmental protection, and may be used in production of different construction materials, furniture panels, etc. Particles of organic filler, in particular wastes of woodworking industry, are ground to size of 1-0.25 mm, fractioned and dried to moisture extent of 3% and below. Then particles of this component and thermoplastic binder are charged with opposite electric charges by means of their supply to surface of rotor that rotates with circumferential speed of 80-120 m/s. As thermoplastic binder you can use domestic waste, such as polyethylene bags, containers. Charged particles of filler and binder are mixed. Mass prepared in mixer is sent through overbridge equipped with bipolar ioniser. Length and diametre of overbridge are such that they provide time of 10-12 sec for mass staying, which is sufficient to achieve residual charge of static electricity by voltage value of 20-500 V/cm. Invention makes it possible to produce cheap items by simple method with density of 0.99-1.00 g/cm3 and flexural length of at least 42 MPa, to recycle wastes, improve ecology and reduce toxicity of items.
EFFECT: production of cheap items by simple method with density of 0,99-1,00 g/cm3 and flexural strength of at least 42 MPa, recycling of wastes, improved ecology and reduced toxicity of products.
1 dwg, 1 tbl
FIELD: wood industry.
SUBSTANCE: invention pertains to production of chipboards. The board includes bottom and top surface layers with fine particles, and an intermediate layer with more coarse particles is placed between these surface layers. The intermediate layer has various density in the areas, where the board is supposed to be attached to an other object. The chipboard production method includes even distribution of fines followed by generation of the first particle matrix to form a bottom surface layer, distribution of more coarse particles followed by generation of the second particle matrix above the fine particle matrix using a distribution device so that at least in one zone the coarse particles are applied in a more thick layer than at least in one surrounding area, even distribution of the fine particles followed by generation of the third coarse particle matrix to form a top surface layer and compression of the first, second and third matrices, whereby the intermediate layer thickness remains virtually unchanged, so the intermediate layer has various density.
EFFECT: produced chipboards feature increased soundproof and heat-insulating properties, and light weight, that facilitates efficient shipment of the processed boards.
9 cl, 13 dwg
SUBSTANCE: method of construction beam production out of modified wood involves wood modification by squeezing fine metal powder into lumber cavity, with further formation of lumber face by rolling even surface before feeding it into reverse mold, where lumber is put by metal faces together. Then ultra high frequency (UHF) current is applied to beam ends to mollify metal powder, and modified materials are connected in reverse mold by pressing, at the moment of which UHF current is switched off, and obtained seam is cooled, finished beam is extracted from reverse mold freeing it for next beam pressing.
EFFECT: obtainment of construction beams of specified shape and strength properties.
1 dwg, 1 tbl
SUBSTANCE: converted timber or chip plate is made of eucalyptus breeds and connected by means of binding substance containing isocyanatic or phenol polymeric compound. Eucalypti of the following species were selected: Bluegum (E. Globulus), Karri (E. Diversicolor), Sydney Bluegum (E. Saligna), Marri (E. Calophylla) or Jarrah (E. Marginata).
EFFECT: high surface strength, wet resistance and low swelling ratios.
10 cl, 1 dwg
FIELD: technological processes.
SUBSTANCE: method includes grinding of woodworking wastes or plant materials, mixing with binder and subsequent pressing. Binder is liquid sodium glass that contains dry substance of glass 30-70; water 70-130 wt parts; at that cold pressing is executed, and binder is taken in amount of 20-50 wt parts per 100 wt parts of wastes. Binder may additionally contain hardener - salts of mineral acids in amount of 3-5 wt parts, in this case liquid sodium glass is preliminarily homogenised with hardener.
EFFECT: invention makes it possible to prepare ecologically clean, thermally resistant and moisture resistant items.
8 cl, 3 tbl
SUBSTANCE: rush stems are flattened in rolls, laid mutually perpendicular and milled into shreddings with particle size of 5-15 mm or into powder with particle size of 100-300 mm, saturated with water solution of bakelite resin in amounts of 1-2% or with water solution of wax emulsion, or mixed with heated up to liquid state bitumen or with particles of wire in amounts of 0,5-2%. Then the raw material is heated up to release of proper bonding agents, pressed either in pressing molds or through shaped hole of pressing mold with required products forming and is hold in acclimatisator until cooling.
EFFECT: invention allows for reducing energy consumption and obtaining strong, durable and ecologically clean construction materials, products and structures.
2 cl, 4 ex
SUBSTANCE: reed laminose material is made of dace or southern reed, contains odd, maximum 15, quantity of the layers executed from cut lengthways on thin strips of a reed stalks and laid in an is mutual-perpendicular direction. Strips are impregnated by carbamide, urea-formaldehyde or phenol-formaldehyde gluing compositions with hot solidification and are pressed in compression moulds at temperature 100-140°C and pressure 0.8-1.5 MPa. Equipment for manufacture of a reed-layered material has the conveyor consisting from plates for feed of a reed slab, the slab piercing gear, the directive conveyor connected to hydraulic system and executed with possibility of its movement by the rail together with a cutting frame by means of the longitudinal feed gear. Equipment also contains the horizontal dividing device for reed layer partitioning off from a total mass, directive bulwarks for the reed layer feed on a slab, glue feed system for reed impregnation by glue, the elevating device, the device for lowering of a reed layer on size of the removed layer, with possibility of feed of the received laying in system of hydraulic pressing for formation of a reed-layered material.
EFFECT: invention will allow receiving a material with high technological properties.
2 cl, 5 dwg
FIELD: wood=working industry, in particular, production of presswork from particles of vegetable origin.
SUBSTANCE: in the method for production of composite boards without addition of a binder, from a hydrolyzed lignocelluloses material, before hot pressing, the fibrous mat is formed with the use of a film of polyethylene, up to 0.2 mm thick, laid as a component of the external layers of the pressed composition. Pressing is performed at a temperature of 120 to 140 C and a unit pressure of 50 kg/sq.cm at a duration of pressing of 1 min/1 mm of the board thickness.
EFFECT: enhanced moisture resistance of composite material.
FIELD: wood-working industry; production of pressed building items.
SUBSTANCE: the group of inventions is pertinent to the field of production of pressed building items made out of plant roughage and may be used in wood-working construction industries and other branches of economy. The panel made by pressing out of a carpet without synthetic binding materials consists of a mixture of a birchen bark ground up to a faction of 40-5000 microns and a filler predominantly out of cellulose filaments at the following ratios in respect to the total dry solid matter (in mass %): a birchen bark - 60-95, cellulose filaments - 5-40. In an alternative version of the panel, which is made the same way as the above, the outer surfaces of the carpet are strengthened with lingo-cellulose-polymeric compound including an excelsior and the KF-EC resin with a hardener or an excelsior and triturated secondary polymer taken in amount of 10-12 mass % to the weight of the excelsior. At that the share of the lingo-cellulose-polymeric compound makes 20-40 % to the total dry weight of the carpet. The method allows to use a ground birchen bark without synthetic binding agents for shaping a carpet and its consequent pressing. At that for a carpet formation they use the birchen bark ground up to a faction of 40-5000 microns, and a filler mainly made out of cellulose filaments taken in the following ratio in respect to the total dry weight(in mass %): a birchen bark-60-95, cellulose filaments - 5-40. Before formation of the carpet the filler is moistened up to 18-20 % of absolute humidity and is mixed with ground birchen bark. The carpet is formed with a thickness equal to 200-300 % of the thickness of a finished panel. The group of the inventions ensures simplification of the production process, reduction of its cost, expansion of the range of the List of items.
EFFECT: group of the inventions ensures simplification of the production process, reduction of its cost, expansion of the range of the List of items.
8 cl, 1 tbl
FIELD: production of plate materials of the splint-slab type, applicable in the wood-working and building industries.
SUBSTANCE: the method consists in processing of husk particles by a binder containing urea-formaldehyde resin, ammonium chloride, Aerosil butadienstyrene methacrylic latex, forming of the mat, cold prepressing and hot pressing. The binder instead of ammonium chloride contains ammonium fluosilicate at the following relation of the components, mass percentage: urea-formaldehyde resin - 82.8 to 93.4, ammonium fluosilicate - 0.6 to 1.2; butadienstyrene methacrylic latex - 4.0 to 12.0, Aerosil - 2.0 to 4.0.
EFFECT: enhanced physico-mechanical characteristics of the plates.
FIELD: production of building materials, applicable in the wood-working, furniture and building industries.
SUBSTANCE: the method consists in mixing together of wood particles with urea-formaldehyde resin, butadienstyrene methacrylic latex, ammonium chloride and Aerosil, forming of the mat, cold prepressing and hot pressing. The binder instead of ammonium chloride contains ammonium fluosilicate at the following relation of the components, mass percentage: urea-formaldehyde resin - 82.8 to 93.4, ammonium fluosilicate - 0.6 to 1.2, butadienstyrene methacrylic latex - 4.0 to 12.0, Aerosil - 2.0 to 4.0.
EFFECT: enhanced physico-mechanical and ecological characteristics.
FIELD: wood-working industry, in particular, methods for decreasing the content and emission of formaldehyde intended for fiber boards.
SUBSTANCE: the process of production of fiber boards is conducted with employment of aminated adhesive resins with an addition of substances binding the formaldehyde by compacting in running presses or continuous-action presses and by cooling. After compacting, but before cooling the fiber board is subjected to a short-time curing at 80 to 100C during 6 to 16 hours, depending an the expected level of decrease and emission of formaldehyde and used parameters of the process of production.
EFFECT: reduced content and emission of formaldehyde in the fiber board.
5 cl, 3 dwg, 3 ex
FIELD: wood-working industry, applicable in furniture, building, packaging and machine-building branches of industry.
SUBSTANCE: the method consists in the fact that filings and sawdust composed of: coniferous needles - 80%< filings - 10%, sawdust - 5% and wood fibers - 5% are added to the ground pulp of coniferous needles. The obtained mass is fed to the forming unit, which forms the sheets, which are fed to a press, where they are compacted at a pressure of not more than 10 Mpa at a temperature of not higher than 250C during not longer than 30 S. The obtained coniferous-needle material is cooled down, packed and delivered to the consumers.
EFFECT: produced material with breaking load, high density, low water absorption.
1 dwg, 1 tbl
FIELD: manufacture of substantially flat articles, for instance particle boards and other articles of industrial wood residue or vegetable raw materials by hot pressing thereof.
SUBSTANCE: method for particle board production involves performing hot molding at temperature of 120-200°C and under pressure of 2.5 - 30.0 MPa for panel forming. Industrial waste, molasses, concentrated corn steep or mixture thereof are used as binding material, wherein lime and starch-containing materials are added to mixture including industrial wood residue or vegetable raw materials and the binding material before hot molding operation beginning.
EFFECT: increased ecological safety and increased strength of the panels.
4 cl, 1 tbl, 1 ex
FIELD: production of plate material.
SUBSTANCE: proposed composition is made on base of dispersed raw material with modifying additive; plate material is made by molding the said composition at temperature of 160-190°C and pressure of 65-95 kg/cm2; molding time of 1 min per 1 mm of plate thickness. Used as modifying agent are acid by-products of oxidation of cyclohexane of caprolactam process at mass ratio to wood wastes of 50-70:30-50, respectively.
EFFECT: facilitated procedure of production of composition.
FIELD: wood-working industry.
SUBSTANCE: fiber or chip is dried, then it is mixed with glue at a temperature of below 100C, and a plate is formed at a temperature above 140C, wood is decomposed into solid and liquid components that are used as the glue. The installation for manufacture of the plate has a drying device, device for application of glue onto the fiber or chip, device for compaction, transport facilities for transferring the fiber or chip from the drying device to the device for application of glue, mixer having means for cooling the body. The contents of glue in a plate obtained with the use of the installation makes up 45 to 55 kg per cubic meter of plate.
EFFECT: produced plate with a lower contents of glue as compared with plates produced by the known methods.
31 cl, 2 dwg
FIELD: compositions used for manufacture of plates from wood laminate.
SUBSTANCE: composition for manufacture of plates contains rice shell or rice shell and sawdust mixture used as filler, liquid sodium glass having modulus of 2.4-3.6, and silicon dioxide. Artificial silicon dioxides or siliceous dust-like wastes of various industries may be used as silicon dioxides, with SiO2 content making at least 80%. Composition components are used in predetermined ratio.
EFFECT: improved strength and water tightness, and increased efficiency in utilization of various wastes.
FIELD: wood-working industry, and namely the method of manufacture of the structural unit, in particular, slab of wood fiber, wood chip and/or sawdust, and pressing of fiber, chip, and/or sawdust with applied glue for formation of the structural unit, in particular, slab.
SUBSTANCE: at first the wood fiber, chip and/or sawdust are decomposed by steaming into liquid components and hard components. The liquid components are separated and cooled inside the closed hermetic system up to their discharge from the system. During this process the ecological load caused by odor is sharply reduced. The invention also includes a device for realization of the method and a structural unit manufactured on it.
EFFECT: produced an ecologically pure method for manufacture of slabs and a device for its realization.
46 cl, 3 dwg