Method of construction beam production out of modified wood

FIELD: construction.

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

 

The technical field to which the invention relates.

The present invention relates to the woodworking industry and can be used to create construction timber in the form of a beam made of composite structures.

The level of technology

The authors of the famous GOST 24588-81 "Procurement of modified wood", which are obtained by thermodynamic treatment and transverse uniaxial compaction of pre-steamed wood, followed by drying, and are mainly used for various machine parts (bearings, sliders timber frames, linings and so on), and have a density of up to 1100 kg/m3that makes them very inconvenient for use in the manufacture of furniture (get serious), as well as in building structures.

The authors also known of monogram developed by Ukrniitm (see "Study the possibility of obtaining wood pulp by crushing wood for the production of new anisotropic wood materials". The Report Ukrniinti. Topic Trandenkov No. TR 0193039383. Kiev, 1966 - 107 C.).

Monograph is a material made of expanded fiber plexus substandard wood raw material formed by the thinning of the forest.

The breadboard is the first production process monodrama includes the following operations: preparation of raw materials, his razvaltsovannye on long plexus, drying, resinification plexus, pressing and polariscope processing.

Obtained in this way monograph is a very heavy material and is only suitable for certain non-critical building structures and cannot be used in the furniture industry or the finishing work inside the premises during construction.

The authors of the various known methods of making composite materials, for example, A.S. No. 1329972, CL B27N 3/02 "Method of manufacturing a composite material based on phenol-formaldehyde binder and wood filler", in order to improve fluidity, toughness and heat resistance of the material in phenol-formaldehyde binder is injected dicyandiamide in an amount of 1-12 wt.% on the number of phenol-formaldehyde binder.

The analysis showed that such a method of manufacturing a composite material suitable for use in the furniture and construction industries, as it does not work on transverse bending, badly perceives efforts buckling under vertical load and does not perceive the alternating load.

Also known "Method of manufacturing telepresence wood products" in A.S. No. 1346426, CL B27N 3/02, in order to improve the quality of wood products by increasing the fluidity of the viability of the press mass after mixing wood particles with a binder meet the protective treatment pitched particles best choice rubber latex, this phenol-formaldehyde binder take in the amount of 20-25 wt.%, and the best choice latex in the amount of 5-15 wt.% from the number of press mass.

However, such a composite material is not suitable for the manufacture of furniture and building structures as being flexible and elastic, very bad holding shock and does not provide the required surface hardness, and reacts badly to the alternating load, occurring especially in building constructions.

The authors also known application France No. 2618719 the Manufacture of extruded products", which uses wood fiber all breeds and 10% of binder resin, glue or polymersomes substances, extrude the material at a pressure of 80-500 kg/cm2.

However, this material is also not suitable for the production of furniture and building structures. Being flexible and able to absorb shock, he was quite badly perceives thrashing efforts, does not have enough stiffness to shear forces do not deform and not lose its geometric shape, which is very important for furniture, in addition, such material is not environmentally friendly.

The authors also known patent of Russia №2179923, CL 7 B27M 3/14 "Method of manufacturing cast sleepers for Railways broad gauge", inwhich the sleeper to improve performance, reduce its weight and cost are made from wood fibers of different breeds, metal wire, rubber and viscose, and wood fibers obtained from waste wood and lumber, and metal wire, rubber and viscose - from waste tires, when this composition is prepared in the proportion of wood fiber 50-70%, metal wire 30-10%, liquid rubber 5-10%, liquid viscose 5-10% of the moldable mass, the composite mass is fed into a press with a pressure of not less than 75 MPa and stand at least 1 minute at a temperature of 75-100°C with limited access of air.

However, such material is not suitable for the manufacture of building structures, as it has the ability to process and making the required texture.

Authors known methods of bonding of timber on the teeth, tongue, lap, fugu (see Kovalchuk L.M., Bakakin E.N., Belozerova A.S. ' Mechanical bonding of wood on the timing thorn", Nitisastro, Moscow, 1963, p.48) (Glebov J. C., Stammina SCI "Splicing timber length", Was, Moscow, 1982, p.34).

However, such methods of gluing wood is only suitable for flat dry lumber, and impossible ways to glue raw lumber, especially round timber and sawn timber of different species.

AB is oram also known patent RF №2179923, CL MCI VM 3/14, "Method of manufacturing cast sleepers for Railways broad gauge", which made the sleepers of wood fibers of different breeds, metal wire, rubber and viscose by pressing with a pressure of not less than 75 MPa at a temperature of 75-100°C. But this method are fundamentally different composite material, which by its composition and technical characteristics different from solid wood and can not be used for bonding wood.

The authors of the famous patent USSR No. 1790487, CL VC 5/04, "the welding Method of wood", which in the junction of the surfaces under pressure from pump metal powder, after which the joined surface is placed in a chamber with carbon dioxide, and the connection they make with the help of pulse pressure cold.

This method of connection of the ends of the wood was very expensive, as it requires a special camera with carbon dioxide, working under high pressure, and a special device cold welding semimetallic all welded materials that severely limits the practical application of this method.

Authors known prototype - RF patent №2235637, where on the surface of the timber with the help of dispenser put a layer of fine metal powder and served the lumber with Poroskov press, the upper part of which is patterned matrix, and the powder is pushed into the surface of the lumber, and then lumber back to the dispenser, turn over, put on a second layer of fine metal powder and again served in the press, where presses the powder into the surface of the timber with strictly defined pattern, and for the final formation derivatices material it is passed through rollers rolling machine, with derevometallicheskie material prepared in the proportion of wood 98%, small metal filings 2% by weight of the material, and serves to press with a pressure of not less than 7 MPa with a holding time of 30 s, and rolling the resulting material force between the rolls of not more than 20 kN.

However, this method cannot be manufactured beams, precast modified materials, you can only increase the strength of plastic lumber.

The invention

In the method of production of construction timber of the modified wood is assumed that the matrix lumber is treated metal surfaces, the ends of the lumber conveyed into contact current ultra high frequency (UHF), which softens the metal on the surface of the lumber, and folded so the beam in the matrix rises up the cylinder until it stops in about rancitelli, upon contact with which the supply of the microwave is stopped, and the metal surface are compressed and cooled, and upon the return movement of the matrix down finished building the timber of the modified wood is removed at prosopagnosic, which frees a matrix for a new cycle of production of construction timber.

The presence of such distinguishing features from the prototype allows us to conclude that the proposed solution has a significant novelty.

For evidence of conformity of the proposed method the criterion of significant differences compared to the main features of the "Method of manufacturing derivatices materials" (Patent RF №2235637) and "method of production of construction timber of the modified wood".

In the result, it was found that in the prototype layer of lumber only hardened fine-grained metal powder, and such lumber may not be laminated construction timber.

The technical result, which gives a positive effect in comparison with the prototype, is determined by the properties and parameters shown in the table.

Table 1
Comparison of key indicators
Properties and other indicatorsThe inventive methodPrototype - RF patent №2235637
Preparation of lumberThe introduction of fine-grained powder in the faces and the rolling plastiRolling plasti by drawing a pattern
Composition of modified wood, %:
- lumber;
- wood fibers;
metal powder



96,0
-

4,0



-
98,0

2,0
Method of preparation layer for bondingCurrent ultra high frequency-
Method of bonding timberPressing the softened metal powder in the matrix-
Pressure3 MPa7 MPa
The pressing time1030

The presence of the distinctive features of the proposed method from the prototype allows us to conclude that it meets the criterion of "substantial differences".

p> Data analysis the table shows that the inventive method can be implemented, as it has all the original settings.

The drawing shows the General scheme of the method of production of construction timber of the modified wood, over each item shows the status of the modified little metal powder wood.

Information confirming the possibility of implementation of the invention

Method for the production of structural timber from modified wood begins with the filing of the original lumber (1) reverse roller (2) of the dispenser (3) little metal powder (4). Dispenser with metal powder is moved along the plane of the lumber using a reversible conveyor (5), to which it is attached. The operator moves the adjustable slit (6) of the dispenser above the plane of the lumber, and metal powder under air pressure pressed into the fibers of the wood. As soon as the coating metal powder finishes, lumber is automatically transferred to the rolling roller (7), where the lower rollers (8) and the upper rollers (9)connected to the cylinders (10), and finally form the surface of the lumber, depending on requirements, either one layer or two. Then the lumber is passed on about eroticly roller (11), with the rotator (12), and depending on the source material forming the roller (13) collects beams (14) of two or three connected parts, and then assembled beam without stopping is transferred to the matrix (15), which is connected below with hydraulic cylinders (16), and in the upper part has a stopper (17), and in the upper part have special contacts (18), connected by wires (19) with the generator (20) high frequency, and the rod (21) contacts connected to the hydraulic cylinder (22)that through the support (23) can be pulled on the end of the rod contacts and after heating the metal powder in the joints and contact beam with stop immediately disable the generator of the microwave and remove the contacts. Upon further movement of the matrix upside cylinders is pressing structural timber, and it is removed on prosperiety (24) and out of the shop, freeing the matrix for subsequent pressing of construction timber.

Implementation of the proposed method of construction timber of the modified wood will open up new possibilities in the creation of durable derivatices beam with predetermined forms and strength. Such building boards can be used in the most responsible and stressful components of building structures. In addition to contanimation the seams of the boards can be attached to various forms and strength of embedded parts for sealing corners, frames, doors, and similar building structures.

Method for the production of structural timber from modified wood, including forcing little metal powder to the surface of lumber, car plastic rollers to create a uniform coating, the supply of treated lumber in a matrix, wherein the matrix lumber is treated metal surfaces, the ends of the lumber conveyed into contact current ultra high frequency (UHF), which softens the metal on the surface of the lumber, and folded so the beam goes up the cylinders to lock the stopper in contact with which the supply of the microwave is stopped, and the metal surface are compressed and cooled, and upon the return movement of the matrix down ready construction timber from modified wood is removed at prosopagnosic, which frees a matrix for a new cycle of production of construction timber.



 

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2 dwg, 1 tbl

Composite tie // 2256020

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EFFECT: reduced cost of track laying.

1 tbl, 6 dwg

FIELD: railway transport; tie-preparation plants.

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EFFECT: provision of high capacity and efficiency of equipment.

3 cl, 5 dwg

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