FR2870476A1 - Green wooden blocks or logs treating method, involves immersing totally logs in hot oil tank that is homogenously heated, by thermostatic heating units placed in isolated manner from logs, up to total impregnation of log - Google Patents

Abstract

The method involves immersing totally logs in a hot oil tank (1). The oil tank is homogenously heated, by thermostatic heating units (3) placed in an isolated manner from the logs, up to the total impregnation of the log which is acquired when the oil no longer manifests swirl or bubble. The tank has a prong (2) exerting vertical pressure on the log. The oil is filtered by a filtering system (4). An independent claim is also included for a device for treating green wooden blocks or logs.

Description

2870476 -1-

  The present invention relates to a method and its device, for the treatment of logs or logs in green wood, immediately after felling and debarking, allowing the immediate implementation (sawing, flow, joinery, ..) without waiting for drying. It gives the wood properties of resistance to chemical and biological attack while improving its physical properties. It facilitates its work by the elimination of mineral matter included in the sap. There is currently no close or similar upstream treatment technique, the reactions generated by this process have never been used or even considered and can not be compared to any of the current methods of drying or impregnation: tunnel oven, autoclave, under pressure, under vacuum ... The best results by the latest techniques currently used get at best a residual of hydrometry in the wood of 25%, unsatisfactory, without penetration at heart, which induces that the wood continues to work according to the climatic environment in which he is exposed.

  All the current techniques come after a drying time penalizing in duration and volume of storage. They often require polluting chemical treatments against biological attacks and preservation of physical characteristics of mechanical strength.

  The present invention relates to a process using the property of expelling water with oil brought to the desired temperature to cause its vaporization and replacement by this oil.

  The contact hot oil / cold water, physically causes, without need of implementation of mechanical forces, the expulsion of water transformed into vapor form, resulting in mineral salts and silicas; it gives way to oil penetrating the heart through the canals and the fibers.

  The implementation is started after debarking beforehand to save the process time by treating only the noble part and leaving the secondary material.

  The implementation device is characterized by a tank (1) in which the log is immersed entirely in the oil, maintained in this situation by claws (2) or any other holding system allowing a stable downward thrust According to another characteristic, the oil bath is heated and thermostatically controlled by heating elements (3). The heating elements are placed so as to be isolated from the wood and to ensure a homogeneous heating.

  The log is submerged when the temperature of the oil has reached its treatment temperature. The degree of heating and the duration of the bath are calibrated and determined according to the essence of the wood: a resinous, woody wood, containing more water, supports a high heating; conversely, the higher the density of gasoline, the shorter the heating time.

  The time required for the total impregnation is also variable according to the desired final quality.

  The total impregnation is acquired when the oil no longer shows any swirl or bubble.

  According to another characteristic, a filtration system (4) ensures the optimum quality of the oil by eliminating the waste extracted from the wood. It allows an optimal efficiency of the treatment and the non-degradation of the color of the wood. This filtration system can participate in the homogenization of the heating by the circulation of oil it causes.

  The oil used is a vegetable oil, such as linseed oil, which can treat all species of wood, coniferous, hardwood or tropical. It allows a drying of the best aspect for a furniture use for example and is not polluting.

  An oil of mineral origin can produce similar effects provided that a certain fluidity, a heating stability and a neutral coloration are respected.

  The process is simple to implement, directly on the slaughter premises. It calls only a small transportable facility. For example: stainless steel tanks with oil heating elements and log holding claws, all on a truck or located in the geographical area of logging.

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Claims (6)

  1) A method of treating logs or logs of green wood upstream immediately after slaughter and debarking, characterized in that the balls are immersed completely in a hot oil bath.   2) A method of treatment according to claim 1 characterized by a homogeneous heating 5 until total impregnation which is acquired when the oil no longer shows a swirl or bubble.   3) Process of treatment according to claims 1 and 2 characterized in that the oil is vegetable such as linseed oil.   4) Treatment device according to any one of the preceding claims characterized by a tank (1) of immersion comprising a system (2) for holding the log, exerting a vertical pressure and preventing its ascent or rotation.   5) Treatment device according to any one of the preceding claims characterized by a thermostatically controlled heating (3) placed in isolation from the wood.   6) Treatment device according to any one of the preceding claims characterized in that the oil is filtered (4) for the removal of waste wood extracts. This filtration system can participate in the homogenization of the heater by the oil flow it produces.