Wood-based panel and the method of its production (alternatives)

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

 

Group of inventions relates to the manufacture of extruded construction products from vegetable raw materials and can be used in woodworking, construction and other industries.

Known here as an analogue, the method of manufacture of slabs of bark (U.S. Pat. RF 1757886, B 27 N 3/02 from 19.03.91 year). In the method-analogue bark of deciduous or coniferous trees. The bark is crushed, sieved to remove particles of bark above and below the desired size. The prepared crust, impregnated with 5-20% solution of polystyrene or methyl methacrylate in ethyl acetate is added to the polymer content of the stove 10-25%. After impregnation, the solvent (ethyl acetate) to remove the recovery. Plate form by a method of compression molding at a temperature of melting of the polymer (polystyrene - +180±5°for polymethylmethacrylate - +170±5° (C) and specific pressure of 10±0.5 MPa. The dwell time under pressure is 0.3-0.5 min per 1 mm thickness of the finished plate. The molded plate is cooled under pressure to a temperature of about 110°C, after which the plate is removed from the preform.

The disadvantage of this method is similar is that to create the required strength of the products obtained using synthetic polymers in a volatile solvent, removal of which requires a separate stage distillation toxic what about the solvent, requiring equipment in explosion-proof execution. In addition, the proposed polymers scarce and expensive and worsen the ecological situation in the shops and in General the company.

Known wood stove and a method of manufacturing these plates are driven as a prototype, in particular, using the bark without the use of synthetic binders (see RF patent N 2173256, 27 N 3/08, 2001).

For the preparation of press-composition of the carpet take vegetable raw materials - bark - and punish him hydrolysis at a temperature of 170-180°C for 2 h, after which the mass is dried to a moisture content of 8% and pressed at a temperature of 20°and a pressure of 15 MPa, and then pressed at 160°C and 15 MPa. The duration of pressing of 1 min per 1 mm thickness of the finished plate. After hot pressing the plastic is subjected to cooling in the press without removing the pressure. The prototype is largely improves the ecology of production materials.

A disadvantage of the known solutions is that its implementation requires a stage of hydrolysis and stage cooling ready plastic in the press without removing the pressure, which complicates the technology in General and increases the cost of production. In addition, the assortment of plates is limited to high density products.

And similar, and the prototype does not include the use of birch bark, so as soon as b is Rezovo bark has a complex morphological structure, including bast, bark and cork, for grinding in which technology Board production require special grinding system, which is described in sources not specified. In addition, in the known methods lack the necessary technological methods to eliminate the harmful effects of tar, part of the birch bark.

The group of inventions solves the problem of disposing of the bark of birch wood, which is the tonnage of waste primary production, and improves the environment in the company and in the region, as well as creating valuable consumer goods, namely building boards with a wide range of properties of the waste of the primary production of birch bark.

The technical result of the group of inventions is to eliminate the above drawbacks. This result is achieved in that the wood stove made by pressing from the carpet without synthetic binder consists of a mixture of crushed to a fraction of 40-5000 μm birch bark and a filler mainly of cellulose fibers with the following proportions of the total dry matter, wt.%:

birch bark - 60-95,

fiber cellulose - 5-40.

The outer surface of the carpet to enhance made from ligno-cellulosic polymer composition consisting of wood chips and resin KF-EU with hardener or on evennou shavings and powdered secondary polymer, for example polyvinylchloride, polyethylene, Dacron and the like, taken in an amount of 10-12 wt.% the weight of the chips, and the share of the ligno-cellulosic polymer composition comprises 20-40% of the total dry weight of the carpet. As ligno-cellulosic component used crushed particles of vegetable origin, such as wood chips, waste paper, stems annual plants: the goose-pie, cane, straw, chaff, etc. and husks, tubina and other

This result is achieved in another embodiment by the fact that wood stove made by pressing from the carpet without synthetic binder with reinforced outer surfaces, consists of a mixture of crushed to a fraction of 40-5000 μm birch bark and filler from the cellulose fibers with the following proportions of the total dry matter, wt.%:

birch bark - 60-95,

fiber cellulose - 5-40,

thus the outer surface of the carpet strengthened ligno-cellulosic polymer composition consisting of wood chips and resin KF-EU with hardener or wood shavings and powdered secondary polymer, taken in an amount of 10-12 wt.% the weight of the chips, and the share of the ligno-cellulosic polymer composition comprises 20-40% of the total dry weight of the carpet. The powder of the secondary polymer selected from polyvinyl chloride, polyethylene or polyester, etc.

This result is achieved also for the and the in the method of manufacturing wood-based panels, including the use of shredded bark without synthetic binder for the formation of the carpet and its subsequent pressing to form a carpet use birch bark, crushed to a fraction of 40-5000 μm, and a filler mainly of cellulose fibers with the following proportions of the total dry matter, wt.%:

birch bark - 60-95,

fiber cellulose - 5-40,

moreover, before forming the carpet filler humidify up to 18-20% absolute humidity and mixed with shredded bark, the carpet is formed with a thickness equal to 200-300% of the thickness of the finished plate and the outer surface of the carpet before pressing reinforce.

The outer surface of the carpet reinforce ligno-cellulosic polymer composition consisting of wood chips and resin KF-EU with hardener or wood shavings and powdered secondary polymer, such as polyvinyl chloride, polyethylene, Dacron and the like, taken in an amount of 10-12 wt.% the weight of the chips, and the share of the ligno-cellulosic polymer composition comprises 20-40% of the total dry weight of the carpet.

As ligno-cellulosic component used crushed particles of vegetable origin, such as wood chips, waste paper, stems annual plants: the goose-pie, cane, straw, chaff, etc. and husks, tubino and other

The same result is achieved in another embodiment, a method of manufacturing wood-based panels, in which the outer surfaces of the Mat formed according to claim 6, increase the ligno-cellulosic polymer composition consisting of wood chips and resin KF-EU with hardener or wood shavings and powdered secondary polymer, taken in an amount of 10-12 wt.% the weight of the chips, and the share of the ligno-cellulosic polymer composition comprises 20-40% of the total dry weight of the carpet.

As ligno-cellulosic component used crushed particles of vegetable origin, such as wood chips, waste paper, stems annual plants: the goose-pie, cane, straw, chaff, etc. and husks, tubino and other

Examples of implementation methods

Example 1. Take a birch bark, dried it until the equilibrium moisture content and milled in the first corrupt with mandatory fractionation, in which the cork and lubove part of birch bark turn to dust and are eliminated. For grinding the remaining bark is used as a rule, jet mills are able to grind birch bark to a particle size of 40-5000 μm. Raw materials containing cellulose (paper or waste money, waste pulp & paper, and others), grind the dry way to fibers (Pochinki), moistened to a moisture content of 18-20% and mix thoroughly prepared with the bark, in the ratio of, respectively, 20:80 wt.% on the dry substance. Then form the carpet, the weight of which corresponds to the specified density, and thickness of the carpet is 200% of the desired thickness of the finished plate. Thus the outer surface of the reinforce 20 wt.% of the total dry weight of the carpet ligno-cellulosic polymer composition which is a mixture of fine wood chips, preferably made shaving machines and 10 wt.% the weight of the resin chips series KF-EU with hardener. Thus formed, the Mat is pressed at a temperature of 160-180°C. the pressing Time is 0.5-0.8 min 1 mm thickness.

Example 2. The method is carried out as in example 1. When I take the ratio of birch bark to the cellulose fibers 60:40 wt.%, the thickness of the Mat 200%. The outer surface of the carpet reinforce the same way as in example 1, only take 40 wt.% of the total dry weight of the carpet ligno-cellulosic polymer composition and which use polyester and wood chips. Polyester is used in the amount of 12 wt.% from the absolute weight of the chips.

Example 3. The method is carried out as in example 1. When I take the ratio of birch bark to the cellulose fibers 50:50 wt.%, the thickness of the Mat 300%. The outer surface of the carpet reinforce the same way as in example 1, only take 30 wt.% of the total dry weight of the carpet ligno-cellulosic-polimernoi composition, which use the polyvinyl chloride and wood chips. Polyvinyl chloride is used in the amount of 11 wt.% from the absolute weight of the chips.

Example 4. The method is carried out as in example 2, only the carpet is formed with a thickness of 300% of the thickness of the finished plate.

In addition, were carried out as in example 1, but with a ratio of birch bark and fibres of cellulose 95:5 wt.%, performed without amplification, with the thickness of the Mat 300% of the thickness of the finished product - example 5 example 6 with the ratio of bark and fibers 70:30 wt.% and thickness of the carpet 200% of the thickness of the finished product without reinforcement surface.

Samples of the plates was subjected to physical and mechanical tests. When the test was determined bulk density, tensile strength in bending, ultimate tensile stress perpendicular to the seam, water for 24 hours and swelling for 24 hours.

The results of the test plates obtained are presented in the table. The table shows that the density of the plates varies from 350 to 800 kg/m3. In the known method prototype Board densities vary slightly.

When used to enhance the surface of the chip with a powder polymers sharply reduced water absorption and swelling of the plates. The same effect is obtained when the proportion of bark in the plate. When strengthening the surface of the chips with resin type KF-EU curing agent d is to increase the tensile and bending strength perpendicular to the gap layer. A wide range of received according to a group of inventions slabs of birch bark can significantly extend the scope of such products.

Indicators of physical and mathematical properties of slabs of birch bark
ExampleName sampleThickness, mmDensity, kg/m3Limit durable. in bending, MPaLimit durable. at break, MPaWater absorption 24 h, %Swelling 24 h, %
1.Spending the furniture with enhanced surface-Tue16800301,74010
2.17600251,25015
3.Construction spending14650180,43510
4.16500140,36015
5.Tits insulation20400-0,1102
6.30 350-0,2153

1. Wood stove made by pressing from the carpet without synthetic binder consisting of a mixture of crushed to a fraction of 40-5000 μm birch bark and a filler mainly of cellulose fibers with the following proportions of the total dry matter, wt.%:

birch bark 60-95,

cellulose fibers 5-40

2. Stove according to claim 1, in which the outer surfaces of the Mat reinforced, the reinforcement is made from ligno-cellulosic polymer composition consisting of wood chips and resin KF-EU with hardener or a mixture of wood chips and powdered secondary polymer, such as polyvinyl chloride, polyethylene, Dacron and the like, taken in an amount of 10-12 wt.% the weight of the chips, and the share of the ligno-cellulosic polymer composition comprises 20-40% of the total dry weight of the carpet.

3. Stove according to claim 1 or 2, in which as ligno-cellulosic component used crushed particles of vegetable origin, such as wood chips, waste paper, stems annual plants: the goose-pie, cane, straw, chaff, etc. and husks, tubina and other

4. Wood stove made by pressing from the carpet without synthetic binder with reinforced outer surfaces, consisting of a mixture of crushed to a fraction of 40-5000 µm be esoway crust and filling mainly of cellulose fibers with the following proportions of the total dry mass, wt.%:

birch bark 60-95

cellulose fibers 5-40,

in which the outer surface of the carpet strengthened ligno-cellulosic polymer composition consisting of wood chips and resin KF-EU with hardener or wood shavings and powdered secondary polymer, taken in an amount of 10-12 wt.% the weight of the chips, and the share of the ligno-cellulosic polymer composition comprises 20-40% of the total dry weight of the carpet.

5. Stove according to claim 3, in which the powder of the secondary polymer selected from polyvinyl chloride, polyethylene or polyester, etc.

6. A method of manufacturing wood-based panels, including the use of shredded bark without synthetic binder for the formation of the carpet and its subsequent pressing for the formation of the carpet using birch bark, crushed to a fraction of 40-5000 μm, and a filler mainly of cellulose fibers with the following proportions of the total dry matter, wt.%:

birch bark 60-95,

cellulose fibers 5-40,

moreover, before forming the carpet filler humidify up to 18-20% absolute humidity and mixed with shredded bark, the carpet is formed with a thickness equal to 200-300% of the thickness of the finished plate.

7. The method according to claim 6, in which the outer surface of the carpet reinforce ligno-cellulosic polymer composition consisting of wood chips with the resin KF-EU with hardener or wood shavings and powdered secondary polymer, for example, polyvinyl chloride, polyethylene, Dacron and the like, taken in an amount of 10-12 wt.% the weight of the chips, and the share of the ligno-cellulosic polymer composition comprises 20-40% of the total dry weight of the carpet.

8. The method according to PP or 7, in which as ligno-cellulosic component used crushed particles of vegetable origin, such as wood chips, waste paper, stems annual plants: the goose-pie, reed, straw, fire, etc. and husks, tubino and other



 

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FIELD: packing equipment.

SUBSTANCE: method involves grinding paper to obtain paper flakes; distributing paper flakes to produce paper flake coating and spraying liquid adhesive on coating surface; performing the first compaction operation to compact flakes and the second compaction operation to compact coating; forming paper sheet with a number of reinforcing depressions during the second compaction operation.

EFFECT: provision of paper sheet rigidity comparative with that of corrugated cardboard along with reduced material consumption, cost and increased simplicity of sheet production.

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