RU2261798C2 - Method of gluing green timber - Google Patents

Abstract

FIELD: wood working industry.

SUBSTANCE: method comprises setting the ends of the timber to be glued in the die filled with synthetic material and pressing. The ends of the timber to be glued is rolled by means of rolls until the timber fibers are produced. The fibers are washed up to remove fine wood particles. The fibers are brought together in the die, and the die is filled with synthetic material composed of 70% of wood fibers and 30% of synthetic material. The mass is pressed under the pressure 100 Mpa during no less than 5 min at a temperature of 75-100°C.

EFFECT: expanded functional capability and reliability.

6 dwg, 1 tbl

Description

FIELD OF THE INVENTION

The present invention relates to the woodworking industry and can be used to create building timber, wooden structures and composite lumber.

State of the art

The author is aware of methods for gluing lumber to a tooth tenon, lap joint, and jointer (see Kovalchuk L.M., Baskakin E.N., Belozerova A.S. “Mechanized gluing of wood onto a tooth tenon”, TsNIITIElesprom, Moscow, 1963, p. 48) (Glebov I.T., Vstomkina Yu.I. “Splicing of lumber along the length” of VNIPIEIlesprom, Moscow, 1982, p. 34).

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

The author also knows the patent of the Russian Federation No. 2179923, class. MKI B 27 M 3/14, “Method for the production of cast sleepers for broad gauge railways”, with which the sleepers are made from wood fibers of various species, metal wire, rubber and viscose by pressing with a pressure of at least 75 MPa at a temperature of 75-100 ° C. But in this way a fundamentally different composite material is obtained, which in its composition and technical characteristics differs from solid wood and practically cannot be used for gluing wood.

The author knows the prototype - USSR patent No. 1790487, class. B27K 5/04, “Method of wood welding”, in which metal powder is injected into the junction of surfaces under pressure, after which the surfaces to be joined are placed in a chamber with carbon dioxide, and they are connected using pulsed pressure using the cold method.

This method of joining the ends of the wood is very costly, since it requires a special chamber with carbon dioxide, operating under high pressure, and a special device for cold welding of semimetallic ends of the materials being welded, which sharply limits the practical application of this method.

SUMMARY OF THE INVENTION

In the proposed method for gluing raw timber, it is proposed, first of all, to roll the ends of the glued timber to rolls to produce wood fibers, which are then washed, freeing them from small wood particles, and to wash the washed wood fibers of the glued timber in a matrix, and fill the matrix with the connected fibers with synthetic material, for example polystyrene, in a proportion of wood fibers 70%, synthetic material, for example polystyrene, 30%, this mass is fed under a press with a pressure of 100 MPa and incubated for at least 5 minutes at a temperature of 75-100 ° C.

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

To prove the conformity of the proposed method to the criterion of significant difference, a comparison was made of the main features with the prototype of the patent No. 1790487. As a result, it was found that the ends for splicing are prepared in different ways. Various and special devices for splicing the ends of timber, the prototype does not indicate the gluing pressure, the gluing temperature, there is no ratio of metal powder and wood, there is no gluing time, carbon dioxide is required to organize production by the prototype method.

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

Comparison of the main features Properties and other indicators The inventive method Prototype
(patent No. 1790487) Preparing wood ends for gluing Fiber rolling Fine injection of fine metal powder Special devices for splicing ends Press Matrix Carbon Dioxide Chamber and Cold Welder Bonding pressure 100 MPa Not indicated Bonding temperature 75-100 ° C Not specified Composition
- wood fibers
- synthetic material, e.g. polystyrene
- metal powder 70% -30% Not indicated Bonding time Not less than 5 minutes Not indicated Limitation Air access Carbon dioxide

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

Analysis of the data in the table shows that the claimed method can be technically implemented, as it has all the initial parameters.

List of drawings

Figure 1 shows the operation of rolling the ends of the bonded material by rollers to the formation of wood fibers.

Figure 2 shows the operation of washing wood fibers using nozzles with water.

Figure 3 shows the operation of connecting the ends of the wood fibers in the matrix.

Figure 4 shows the operation of filling in a matrix of wood fibers with synthetic material, such as polystyrene.

Figure 5 shows the operation of pressing the ends of the joined timber in the matrix.

Figure 6 shows glued timber.

Information confirming the possibility of carrying out the invention

Bonding of raw timber begins with the rolling of the ends of the timber 1 with rollers 2 under pressure P to obtain wood fibers 3. Then the ends of the wood timber 1 are fed under nozzles 4, which wash the wood fibers 3 with water, freeing them from small wood particles into the tank 5, from which they merge into waste. The washed wood fibers 3 of the ends of the glued timber 1 are joined and laid in a matrix 6, then after laying the matrix 6 is filled with synthetic material, for example polystyrene 7, maintaining a proportion of 70% of wood fibers 3 and 30% of synthetic material, for example polystyrene, 7. The prepared mixture in the matrix 6 is fed under a press 8, which presses with a force of 100 MPa at a temperature of 75-100 ° C for at least 5 minutes, after which the glued timber is removed from the matrix and the resulting joint 9 is cooled in air.

Implementation of the proposed method will allow gluing raw timber of both round and flat sections, which will significantly reduce the cost of their preparation (excluding the drying operation of timber), it is possible to glue round timber and timber of different species and moisture, which will significantly increase the range of building timber, wooden structures various shapes and fast splicing of lumber along the length.

Claims (1)

A method of bonding raw timber for building structures, including laying the glued ends into a matrix filled with synthetic material, followed by pressing them, characterized in that the ends of the glued timber are rolled to produce wood fibers, which are then washed, freeing from small wood particles, and connected the fibers of the glued ends of the timber in the matrix, and the matrix with the connected fibers are filled with synthetic material in the proportion of wood fibers 70%, synthetic cesium material is 30%, this mass is fed under a press at a pressure of 100 MPa and incubated for at least 5 minutes at a temperature of 75-100 ° C.

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