how to deal with china bricks crack?
Why do bricks crack during the drying process? What are the solutions?
The causes and solutions for wind cracking are:
(1) Strengthen the weathering and humidification of raw materials, and ensure uniform mixing of various raw materials and internal fuels. Promptly remove impurities from the raw materials to ensure uniform drying and shrinkage of the body.
(2) Timely maintenance of raw material preparation equipment to ensure that it meets the technical requirements of the process, in order to ensure the quality of raw material crushing and mixing. To prevent uneven raw material crushing, mixing, extrusion and other processes caused by equipment reasons, which may lead to cracking of the billet.
(3) Timely repair and replace the extruder cutter to prevent cracks caused by excessive wear of the cutter, uneven extrusion speed of raw materials, inconsistent compactness of the billet, and inconsistent drying shrinkage.
(4) Maintain the flatness of the cutting machine, repair or replace the mouth of the extruder to prevent the mud strip from being bent and causing cracking of the billet due to the unevenness of the cutting machine; Prevent cracks caused by uneven water (oil) paths at the four corners of the extruder mouth.
② Strengthen the drying intensity of the drying kiln: to ensure that the billets pushed out from the drying kiln are completely dry. (Can preserve 5-7% residual water in seedlings). When checking the billet that comes out of the drying kiln, it is necessary to check whether the center of the kiln car is completely dry. Often, the surface around is dry, but the temperature in the middle is still high, which is the main reason for the pre heating inverted billet.
③ Change the encoding method and control the encoding density.
The more suitable density for the preform should be: 230-260 blocks/m3. And it should follow the principle of medium sparsity and dense edges. Especially the middle passage should be left larger to ensure proper ventilation and moisture removal.
