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FR
La plaque de duralumin 1P-A6 (ЬЭбО mm X 1400 mm), fixée sur un statif, est réchauffée par des radiateurs montés stablement sur des isolateurs sur un panneau d’amiante. Les éléments de chauffage sont repartis en deux circuits, dont l’un réchauffe la partie centrale de la table et l’autre, les rebords. Chaque circuit est commandé séparément par un système de réglage transistor muni d’éléments capteurs de résistance en cuivre contactant la partie intérieure de la plaque. Le réglage de la température se fait automatiquement de 30° à 160° С et l’écart de temperature distribuée à la surface de la table n’excéde pas + 2°C. Le chauffage de la surface de la table à 60° С demande 20 minutes et le refroidissement s’obtient à l’aide d’un ventilateur placé au-dessous du niveau de la table. Trois orifices d’extraction se trouvant dans le plateau de la table sont reliés par conducteurs passant par une valve à vide à une pompe rotative 'MP5'. La valve à vide prémunie d’un manomètre gradué de 0-1 kG/cm2, permet de maintenir la pression à un niveau donné. Les tessaux garnis de caoutchouc et maintenus par des charnières aux rebords de la table servent à la fixation d’une membrane à la surface de la table, durant l’évacuation de l’air à l’aide de la pompe.
EN
The presented series of articles describes a genesis, construction, development and use of a low-pressure table for doubling the paintings and also its other applications in the conservation of works of art. Because the conservation of paintings involves such factors as pressure, raised temperature, moisture and canvass stretching, they have to be approached with far-going caution. A common use of heated tables, usually referred to in Poland as vacuum tables, is associated with too severe work conditions. Therefore, studies have been carried out for years to find new solutions. They have resulted in designing a low-pressure doubling table. Its construction is very simple and it allows to carry out various types of conservation work in which the above listed factors are used in a well-controlled way. This allows also to avoid doubling, restricting thus conservation activity to a permanent strengthening of the object and its protection through impregnation. The unit can also be employed in the conservation of textiles and graphics. So far, it has been modified and improved many times. W. Mitka describes a portable unit for the conservation of paintings, which may also be used in the conservation of mural paintings A. Mitka discusses a low- pressure attachment to be used with an ordinary vacuum table and the use of a perforated plate in this type of units.
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