FI93709C - Device for removing a paint layer from a wooden facade - Google Patents

Description

93709

DEVICE FOR REMOVING PAINT LAYERS FROM WOOD SURFACES

The invention relates to a device for removing one or more paint layers from a wooden facade, when the paint layers comprise an oil paint base layer. The device includes a bracket for one or more infrared radiation sources, means for guided horizontal movement of the bracket along the facade, and means 10 for guided vertical movement of the bracket along the facade.

When restoring the wooden surfaces of old buildings, it is most often necessary to remove the numerous layers of oil and / or plastic-based paint that have cracked and become malignant. Normally, all paint coats must be completely removed from the wood surface to detect possible rot damage.

There are several methods for removing old paint, but all of these methods have problems. The paint can be applied, for example, by scraping the peels or with the help of sandpaper, in which case both methods require a lot of expensive labor or the methods generate dust and annoying noise that is harmful to the environment. In the past, a blow-25 lamp was used to burn off the paint or rather to soften the paint so that it could be more easily peeled from wood. This method is no longer used due to the risk of fire caused by open flames. Currently, a hot air gun is used instead of a blow lamp 30. However, with this tool, it is very difficult to achieve real power because the conduction of heat from the device to the surface depends greatly on the prevailing weather conditions with their wind and air temperatures. Thus, it is difficult to achieve an even distribution of heating at the correct temperature. If the surface is overheated, undesired drying will occur on the surface of the wood. If the surface is heated too little, the paint is difficult to remove 2 93709 and requires more scraper use. The work is heavy on the arms and shoulders, as the hot air gun must be held constantly in one hand and the scraper in the other hand.

AU-A-545 584 describes a hand-held paint removal device by which a user can aim an infrared beam at the surface of an object. This known device, like a hot air gun, loads the arms and shoulders.

10 Today, the most popular methods used in the art to remove paint from a wood facade use either alkaline solutions or strong hydrocarbon-based solutions. Washing with an alkaline solution causes many problems, as the alkaline solution is severely irritating to the skin. Typically, a high pressure jet is used to apply the alkaline solution to the target, perform several washing steps, and introduce neutralizing agents to the target. In this method, several liters of liquid-20 per square meter of surface to be treated must be sprayed, which has an effect on the environment, e.g. on the plants surrounding the building. To neutralize the cleaned wooden surfaces, acetic acid is needed, which has a detrimental effect on, for example, the nails on the facade. Another disadvantage of this method 25 is that the surface of the wood dries, i.e. own natural preservatives contained in wood e.g.

the resin leaves and cracks appear in the wood. This can lead to very negative consequences in the long run when restoring old historic buildings.

The use of hydrocarbon-based solutions carries a risk of occupational disease, as these substances are usually very toxic. These substances are also very expensive, making the process expensive compared to washing with an alkaline solution.

It is therefore an object of the present invention to solve the problems associated with the removal of paint on wood surfaces in an efficient, environmentally friendly and economical manner.

This object is achieved by a device according to the invention as defined in claim 1.

In the device according to the invention, the means for moving vertically comprise at least one vertical guide rod extending through the locking members in the support, for moving the support along the rod and for locking at an optional height; the length of the handlebar must be adjustable by means of the rod pieces to be attached; the radiation source comprises one or more infrared tubes whose longitudinal direction is parallel to the direction of the causes of the wood surface; the bracket is rotatable at least about 90 ° to the oh-15 stand; and the infrared tubes are mounted on the support so that their mutual distance is adjustable.

Mechanical work applied to the surface can be performed by scraping. It has been found that removing paint from the surface of a wood immediately after it has softened is surprisingly easy with this method.

According to a preferred embodiment of the present invention, the members for horizontal movement comprise a tubular profile rail with a groove in the lower part and at least one carriage moving inside the tubular profile rail, which is connected vertically to the support. This rail can be easily attached to the bottom of the eaves.

If the support is additionally provided with distance-adjusting means, they make it possible to adjust the distance between the support and the façade in order to control the radiation intensity.

The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 shows a perspective view of a façade on which a device according to the invention is ready for use, Figure 4 shows a perspective view showing the arrangement of infrared tubes in a support.

FIG.

Below the eaves, at a suitable distance from the façade 10, a tubular profile rail 14 is grooved in its lower part 10. A carriage 16 with wheels 15 runs inside the tubular rail. The carriage is further provided with a connecting member 17 which pierces the groove in a downward direction and on which is mounted a vertical hinge piece 18, which in turn forms a connector 15 for the vertical rod 19.

The length of the rod 19 can be adjusted, since it consists of several pieces 19a which can be screwed on or detached from the end of the rod, which is referred to as 19b. The rod 19 pierces a tubular locking body 20 which can be locked relative to the rod by a handle 21. The locking body 20 is mounted by means of a bearing 22 rotatable in the middle of a rectangular support 23 in which four infrared heating tube lamps 24 are placed (see Figure 2). The locking cap 25 can be locked with respect to the support 23 by means of a spring-loaded pin 25 in one of two angular positions spaced about 90 ° apart. This allows the support 23 to be rotated from a position in which the infrared tube lamps are oriented in a vertical direction to a vertical position to a position in which the tube lamps are in a horizontal direction.

The infrared heating tube lamps are connected via a common cable 26 and a plug to a socket to obtain a two- or three-phase current.

35 A separate circuit breaker 27 is provided in the support for each tube so that the tubes can be switched on and off to adjust the radiation intensity individually.

Each of the four corners of the bracket 23 is provided with distance adjusting members 28 in the form of pointed needles with the tip facing the facade 5 and the spherical handle being located at the opposite end. The piercing pins of the bracket 23 can each be moved axially and locked relative to the carriage using a screw 29.

As shown in Figure 2, the tube lamps 24 are mounted between two rails 30 inside the support in its rear wall 31. This allows the tube lamps 24 to be moved in the transverse direction so that their mutual spacing can be varied. Thanks to such an arrangement, the radiation intensity can be varied with respect to the surface delimited by the side walls 32 of the support, e.g. so that most of the radiation can be concentrated in the area between the two cover plates 10a.

The support 23 provided with infrared heating tube lamps 24 can be advantageously moved both horizontally and vertically along the entire facade 10 to systematically treat the facade area delimited by the side walls of the support one at a time until the entire facade surface is peeled from the paint.

; : The bracket 23, which is open towards the wall, is placed in a suitable position on the wall by means of pointed pins 28. In this case, the support 23 can be adjusted to a certain extent in the transverse direction 30 due to the hinge piece 18. The infrared heating tube lamps 24 are then irradiated until: the paint heats up thoroughly and softens. Due to the irradiation heating, certain components of the oil paint become liquid as the other paint ingredients 35 gasify, resulting in bubbling of the paint. In this case, the paint can be removed very easily with a scraper-iron. Many old wooden buildings have several layers of 6 93709 oil-based paint, and even if a plastic-based paint layer had been painted on top of these layers, paint removal is still as effortless as the base layers on the wood surface come off as shown in Figure 5 above.

The heating of one facade area described above takes from half a minute to one minute. The support is then transferred to the next untreated area to perform the heat treatment. During the heating of the next 10 facade areas, the softened paint is removed from the already heated area. In this way, the paint must be removed quickly and efficiently. It has been shown that the irradiation treatment of the wood façade has a deep effect on the wood, which is advantageous because the time 15 is well enough to remove the paint before the paint hardens as it cools. At the same time, the moisture contained in the facade is removed.

This treatment still has a surprising technical effect, namely the resin on the wooden board, which has oozed from the outer surface of the wooden façade over the years and is thus more fluid inside the board, tends to be evenly distributed inside the board during heating, i. it travels to the outer part. This renews into the natural defense of the wood's outer surface against moisture and mold. It is also shown that,,. that the façade requires only a very short drying time before coating with new paint if it has occasionally been soaked in the rain.

The invention is not intended to be limited to the application example 30 described, but various alternatives are possible within the scope of the following claims. E.g.

. the conveyor carriage may be designed in different ways and the movement along the front may be arranged in different ways.

Claims (3)

An apparatus for removing one or more paint layers from a wood facade (10), said paint layers comprising a base layer of oil paint and comprising a carrier (23) for one or several sources (24) for infrared radiation, means (14-16) for controlled movement of the carrier in horizontal direction along the facade (10), and means (19-21) for controlled movement of the carrier in vertical direction along the facade (10), characterized in that the means for vertical movement comprise at least one vertical guide bar (19). extending through reading means (20, 21) at the carrier, which allows movement of the carrier along the bar and reading at any height, that the length of the guide bar (19) is variable by means of screwable closing segments (19a), that the beam source consists of two or more IR tubes (24), the longitudinal direction of which is parallel to the fiber direction of the wood surface (10), that the carrier (23) is rotatable at least about 90 ° in relation to the guide rod (19), and that the IR-r the lugs (24) are movably mounted in the carrier (23) so that their spacing is variable. 2. Device according to claim 1, characterized in that the means for horizontal movement comprise a tube profile rail (14) slotted at its bottom and at least one carriage (16) movable in the tube profile rail vertically connected to the carrier (23). 3. Device according to claim 2, characterized in that the support (23) is provided with adjustable spacers (28), which allow adjustment of the distance between the support and the facade (10). II