DE648786C - Process for glazing and surface coloring of bricks - Google Patents

Description

Process for glazing and superficial coloring of bricks Zum Glazing bricks during the firing process has so far mostly been salt, which was introduced through the pouring openings of the ring furnace. The usage of Salt makes this process relatively expensive. It has also been suggested a surface gloss on bricks due to the "imperfect combustion of." possibly steaming based on wet wood in a ring oven for this purpose to produce specially bricked-up chamber after cooking. The indispensable installation However, this steam chamber makes the system more expensive, slows it down * and thus makes it more expensive Firing process and also makes the bricks more expensive required for steaming.

According to the invention, for glazing and also for the surface coloring of bricks, especially bricks, the imperfect burning of wet wood in the Ringafen is used; the. wet wood but inn or in comminuted condition before Beg introduced during the Garbrennens through the outlet holes into the furnace chamber. Compared to glazing by adding salt, the method according to the invention results in a very considerable reduction in price because of the use of the almost free wood. which is only used in relatively small quantities, as it is not used as a combustion material. Compared to steaming in a particularly emaciated chamber, the process according to the invention does not require any change or addition to the ring furnace, which saves special installation costs, but also simplifies the process itself and does not slow down the firing process. This results in a further considerable reduction in the price, which is increased by the fact that, since the treatment with the wet wood does not take place after the bake, there is no need to reheat the bricks.

The glazing is also easily colored at the same time connected to the surface of the brick, even if it is of a different color Fabric consists, gives it a special hue. In this way, creates .auf light-colored or mixed-colored bricks an opaque dark-colored glaze, without the use of special coloring agents. But if you want a special color achieve, it is only necessary to add suitable metal salts to the crushed wood (Iron sulphate, copper sulphate, etc.) to be mixed in in an aqueous solution, which then also can also serve to moisten the wood.

For example, sawdust, for example from spruce wood.

If the temperature drops too low when the wet wood is to be feared, is also due to the pouring holes at the same time additional dry fuel introduced, which, like peat, for the burning process and also does not have a detrimental effect on glazing and coloring. The trains can be open or closed during the action of the wood. That This process can be used both for bricks with smooth and rough surfaces use, even if the calming is achieved by pressing grains of salt into the Tonstrang, which are later removed again, is achieved. Is the surface be-` sands, the grains of sand remain from. the color achieved by the wood treatment free so that they appear as white dots within the dark glaze.

Not only bricks, but also other bricks, for example Roof tiles can be glazed according to the specified procedure and superficially to dye.

Claims (2)

PATENT CLAIMS: i. Process for glazing and surface coloring of bricks, especially bricks, in the ring kiln due to imperfect combustion of wet wood, characterized in that the wet wood is in a crushed state Before the start of or during the cooking process through the pouring holes into the oven chamber is introduced. "' 2. The method according to claim i, characterized in that at the same time with the supply of wood through the pouring holes additional dry fuel, preferably peat is added. G. The application of the method according to claims i and 2 for bricks with a sanded surface. ¢. Applying the procedure according to Claims i and 2 for bricks with a roughening, which in a known manner by pressing of salt grains in the clay strand and later removal of these grains is achieved.