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porcelain ceramic mug cup with colorful design, stoneware design mug cup

Ceramic Mug    From:Xinxiang Ceramic Mug Manufacturers     2016-3-10
porcelain ceramic mug cup with colorful design, stoneware design mug cup
Glaze layer curl, agglomeration, from body phenomenon commonly referred to shrink glaze. Cause shrinkage glaze for two main reasons: One is the contraction glaze dust and glazes itself. Some of the glaze, particularly those containing tin oxide glaze, if too thick a glaze is applied, or applied on a dirty surface, it will shrink since become larger agglomerates. The remedy is to use a wet sponge to wipe dust billet surface. Establish dust asked to avoid dust off the blanks. If you need to be properly thickened glazing may inserted a small amount (3%) of bentonite in the glaze. Underglaze painted enamel prone to shrinkage defects, because underglaze painted underglaze color material similar to that retained the dust. For this case, mixed with a small amount of glaze on glaze powder, or a small amount of gum arabic.

The second main reason is the glaze ingredients in a plastic too much, even during the dry glaze layer shrink too severe, resulting in micro-cracks, make glaze cracking. In the firing process, the formation of the glaze is easy to stack, lumps, and the cover body can not be uniformly melted. This defect often appear on prime burnt blank. Therefore, this type of glaze is generally not suitable for use on unglazed green body. To accommodate the use of blanks in the biscuit firing, some, such as may be appropriately added to the calcined kaolin clay or a non-plastic material, and calcite in the glaze. Non-plastic material is equal to the amount added minus a certain amount of plastic raw materials. In addition, rubbing gently with your fingers dry glazed, glazed becomes smooth, but also help eliminate some of the glaze cracks. When the glaze has not yet reached the drying requirements, easy to produce excessive heat stack glaze defects.
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