DE479905C - Process for the production of insulating bodies for electrical purposes from wood - Google Patents

Description

Process for the production of insulating bodies for electrical purposes made of wood The use of wood as an insulating material for electrical purposes is known. Since the insulating ability of wood suffers from moisture, e.g. B. when using outdoors, this is how you soak the wood and thereby prevent moisture from penetrating sought to protect. Even in high-voltage equipment, wood is used as an insulating material has been used, e.g. B. as a winding carrier in oil transformers. This is permissible because in this case the wood is completely immersed in dry oil and all moisture is kept away from this oil.

In and of themselves, the components that make up the wood are excellent Isolators. It is made use of by the cellulose derived from wood to which in the technology b # .- ;; annten hard paper is processed, from the insulating body, such as high-voltage bushings and stubs.

The invention relates to a method for producing insulating bodies made of wood and consists in that the insulating body to its insulating ability against To make absorption of moisture insensitive, by a method known to me treated is that the wood, without dissolving its structure, those dielectric Properties that cellulose has. The invention is based on the knowledge that the reduction of the insulation ability of the wood when penetrating, from moisture The reason for this is that the salts contained in the dry wood are dissolved and that makes the wood a good conductor. In the production of cellulose the connection between the individual cells of the wood is not only loosened, but also mainly all salts and acids are removed, which on the addition of Moisture would make good conductors.

To make the wood insensitive to moisture, you can use a method known per se, the z. B. is that in the wood The salts and acids contained therein are first dissolved and washed out with water. The first leaching can be done in ordinary water. The rest of the acids and Salt is then leached out by distilled water, optionally under Boiling, because swelling when boiling makes the digestion process easier will. For leaching, it can also be boiled in sulphide liquor, soda solution or the like Question come.

After the wood is completely leached and washed thoroughly with water is washed out, it is dried. After drying, it can be impregnated will.

Paraffin, shellac, synthetic resin, linseed oil or the like can be used as impregnating compounds. be used. The impregnating masses fill those freed from salts Cells, and the wood then represents a high-quality insulating material. That too Penetration of moisture into the wood would reduce the insulating capacity to a far lesser extent Dimensions affect than unwashed wood because it removes salts and acids are.

Such a method has the advantage that it enables, for example Processing sections of tree trunks into insulators that are subject to high electrical loads.

Claims (1)

PATENT CLAIM: Process for the production of insulating bodies for electrical Purposes made of wood, characterized; that their insulating capacity is thereby improved is that before soaking, all electrolytes form under the influence of moisture Salts are removed by known methods and that after drying in known Way, the cell pores are filled with non-conductive impregnating materials and sealed.