FI64909C - FOERFARANDE VID FRAMSTAELLNING AV LAMINERADE TRAEKONSTRUKTIONER FOERETRAEDESVIS STOLPAR GENOM LIMNING AV IMPREGNERADE DELAR - Google Patents

Description

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JiBjD LBJ (11) utläggningsskrift 64 90 9 C (45) p * :: 1934 (51) Kv.ik.VcU3 B 27 K 5/00 // E 02 D 5/26 ENGLISH I - Fl N LAN D (21) P * tenttlh «k« mi * - »^ ttmölcnlnt 800035 (22) H * k« mlspitvi - AntMcnlngadif Oi .01.80 (23) AlkupUvi— Glkighttidag 0 ^ 4.01.80 (41) Tullut slikuu - Bllvlt ofTuntllf 05.07.8l

Patent and Registration Office ....

‘(44) Date of first issue. - 32.20.83

Patent * och registrstyrelsen Subject matter and publication (32) (33) (31) Pjryduttjr ttuolktut — Bujird prlorltut (71) Hager Aktiebolag, Kryssarvägen 17, S-183 52 Täby, Swedish-Swedish (SE) (72) ) Bror Olof Häger, Djursholm, Sweden-Sweden (SE) (7 * 0 Berggren Oy Ab (5 ^ 4) Method for the production of laminated wood structures, preferably columns, by gluing impregnated parts - Förfarande vid framställning av laminerade träkonstruktioner, företrädesvis stolpar, This invention relates to a method of manufacturing laminated wood structures, preferably columns, in which impregnated parts are glued.

Recently, it has become increasingly difficult to obtain wooden poles longer than 12 meters. They are used primarily for power management purposes. In addition to the length requirements, the poles must have good resistance to the stresses of power lines, which are affected by wind and moisture caused by snow and ice. The poles must therefore have a specified minimum diameter and ground zones, a few meters above and above it. A certain scale is also required in order for the columns to be able to resist attacks by tree-damaging organisms for as long as possible and for good protection zones to be established in the event of impregnation. These different requirements have made it increasingly difficult to obtain poles.

In order to solve the problem, efforts have been made to make laminated columns from glued timber pieces. The 2 64909 column thus obtained is then impregnated. However, there have been difficulties, several experiments have not led to success. However, good results have been obtained if the laminated columns are made of Douglas spruce wood and a suitable impregnation method is used. The strength of Douglas spruce is good. It's hard to saturate. Unsaturated, it has a relatively good resistance to tree-damaging organisms. During manufacture, the pieces of wood are formed and glued into a column in the traditional way. Prior to impregnation, the wood material on the column surfaces has been incised to a depth of 25 mm. Impregnation has taken place with creosote according to Riiping's method.

With this treatment, the columns obtain a saturated protected outer wood zone corresponding to the depth of the incision. This zone has also formed a barrier against the unprotected wooden parts of the column. This has been enough when it has been as resistant a tree as the Douglas spruce.

However, the situation is completely different for the species of wood used as poles in the Nordic countries. Pine wood has a heart - like the whole wood of Douglas spruce - that cannot be impregnated without incision. The surface wood of pine is easily impregnated. Untreated heartwood material has a high resistance to tree-damaging organisms, especially if, as in ordinary columns, a saturated surface wood zone surrounds the heartwood. Untreated surface wood is quite easily exposed to rot.

A treatment similar to that of the Douglas spruce will not give a complete result here. Upon impregnation, the heartwood forms barriers to the penetration of the anti-rot agent into the surface wood located in the inner parts of the column. The protection zone is not sufficient to protect this unsaturated and delicate surface wood. Decay can affect it through cracks.

Spruce - now rarely used as a pillar - has certain obvious disadvantages. Not a single part of it is easy to impregnate without an incision. Decay easily affects both the heart and the surface wood, and neither gets full protection only in the protection zones.

3 64909

Various wood treatment methods are also known from previous patents. For example, Finnish patent application FI-79 4052 discloses a method for gluing an impregnated coating onto an unsaturated column, and Finnish patent FI-10 277 discloses a method for treating thin wooden sheets with open cells with impregnating liquid before or after joining them. Finnish patent FI-60 154 is directed to the treatment of preformed, non-impregnable wooden objects by coating the objects with a thin, impregnable wood, which is then impregnated with a plastic material. Finnish patent application 563/66 discloses a method for coating a sheet material with a porous, fire-retardant agent. According to the Danish patent DK-92 481, the individual parts of the window are treated with linseed oil products. In order to make the thick linseed oil better divided into different parts, these are divided into smaller units. German patent DE-PS 975 608 discloses a method in which a bandage containing an impregnating agent is wrapped around a tree to protect it. British Patent GB-1,310,781 relates to a machine for slicing logs to facilitate impregnation. Such or a similar machine is used to perform a sub-step in the method according to the invention.

However, none of these known methods or devices solves the problem of how to make resistant columns by gluing impregnated parts.

In order to solve these problems, the following method has been developed for pine wood and similar wood species, the main features of which are set out in the appended claim 1. It is primarily directed to columns, but is also applicable to other outdoor wood assortments spruce and similar wood species, but in this case it must be assumed that the same good result will not be achieved as for pine wood. The procedure first comprises that the pieces of wood from which the posts are made are pressure impregnated before gluing, i.e. before they are joined together into a laminated post. In this case, a water-soluble _____ to τ to 64909 salt impregnating agent is preferably used. When timber impregnated with an oil-soluble substance can be glued, impregnation can also take place with an oil substance. However, this is not recommended.

Once the pieces of wood have dried after impregnation, they are combined into a laminated column, which is then impregnated sliced. This incision can, if desired, be limited to the most rot-prone parts of the column, such as the ground zone or the root portion. This latter impregnation can take place with an oil substance with certain advantages if the water-repellent effect of the oil is to be exploited. The first impregnation impregnates the entire surface wood of the laminated column, thus also the surface wood which, after gluing the column together, will be located in the inner parts of the column. The second impregnation impregnates the heartwood located either on or near the surface of the column. Thus, penetration corresponding to the depth of the incision is achieved, at those points where the incision may not have been made because the effects of rot may be judged to remain weak, the power is limited to the additional surface protection and water-repellent surface.

Thus, there is no unprotected surface wood that could be affected by rot through cracks. Also, rot cannot strongly affect the normally unsaturated heartwood from the surface because all the heartwood on the surface is impregnated through the incision. Thus, only the inner heartwood remains the only unsaturated parts of the column. This heart-tree has a high resistance, moreover, the outer impregnated protection zone provides protection.

The incision can be made before or after gluing the pieces of wood together into a laminated column. In this case, the following variation comes into question. The protection provided by the method can be achieved simply by incising, before impregnation and gluing, the pieces of wood from which the column is made on the surfaces which are in the finished column outwards. In this case, too, the incision may, if it is considered justified, be limited to the parts of the column most exposed to rot. In this way, the pieces of wood are impregnated and dried, after which they are joined together into a finished laminated column. This 64909 then receives basically the same condition of protection as when using the double impregnation treatment described above. The entire surface wood becomes impregnated, moreover, an outer protected zone is obtained in which the heartwood is also impregnated.

If desired, the wood treated by the described method can, of course, be given surface protection by conventional painting, spraying or dipping, etc. This is generally not very desirable. However, it may be of interest when the inhibition of rot has occurred exclusively with a water-repellent impregnating agent (salt). In such a case, it may be appropriate to give the wood material surface protection, for example by known treatments using a paint or water-repellent oil product.

Claims (3)

6 64909 1. Fertilizers for the manufacture of laminates in the form of laminates, for example, for the manufacture of laminates, for example, for the construction of laminated products utsatta delar, varpä den impregneras. A method of manufacturing laminated wood structures, preferably columns, by gluing impregnated parts, characterized in that the individual pieces of wood in the structure are impregnated with an anti-rot agent and dried if necessary, then glued together and the glued product cut completely or in the most susceptible parts, then impregnated. 2. Fertilizers for the construction of laminated construction equipment, for example, for the construction of laminated construction equipment och limmas ihop til den färdiga produkten. 2. Method for the production of laminated wood structures, preferably columns, by gluing impregnated parts, characterized in that the individual pieces of wood in the structure are incised on all or the most exposed surfaces to rot, which will be on the outside of the product, then impregnated and dried if necessary and glued together into finished products . Method according to Claim 1 or 2, characterized in that the treated product is surface-treated in a known manner by painting, spraying or immersing it in a paint or a water-repellent oil product. 3. A patent according to claims 1 or 2, which comprises the product of the genome memory, is used to make a product or a wool product. li