Orange peel pattern, as the name suggests, accumulates on the ceramic glaze like orange peel. If it is not deliberately done, the sensory effect of this orange peel pattern must be very bad. Today, bone china manufacturers and win-win ceramic manufacturers will explain the causes of orange peel in ceramic water cups and how to avoid them:
Orange peel pattern is also called orange peel glaze. If the glaze surface is full of brown eyes and looks like orange peel, it is called orange peel glaze. The reason for the formation of orange peel glaze is related to improper glazing process, tire material, glaze and firing.
13 reasons for the orange peel pattern of ceramic water cup products
(1) The initial melting temperature of the glaze is low, the viscosity is high at high temperature, and the fluidity is small, which makes it difficult to bridge the pinholes formed when the small bubbles on the glaze surface burst.
(2) The glaze slurry is too thick or too thin, and the moisture is uneven.
(3) When glazing, the green body is too dry, the moisture is uneven, the green body has floating ash, oil stains, the green body is not well corrected, and the surface is uneven.
(4) The porosity of the biscuit blank is too high, and the glaze is too thin.
(5) The glazing time is too long, the green body is in contact with the glaze slurry for a long time, and the water absorbs too much.
(6) The glaze layer is too thick.
(7) The orange brush glaze method leads to uneven glaze surface, which forms the tiny shrinkage glaze on the glaze surface, which has a concave-convex feeling like orange peel.
(8) There are organic matter, carbon, carbonate, sulfate, iron oxide and other impurities in the green body raw materials, the amount of plastic clay in the green body is too high, the gas is emitted during firing, and the air permeability of the green body is poor.
(9) The moisture content of the green body entering the kiln is too high.
(10) Insufficient oxidation during firing.
(11) The melting temperature of the glaze is too high and the firing temperature is low, the melting of the glaze is poor, and the traces of the escaping gas are not filled by the glaze liquid.
(12) The ventilation in the kiln is poor, there is too much water vapor, the reducing atmosphere is too thick, the reduction time is long, free carbon is deposited on the glaze surface, and pinholes remain after firing.
(13) The firing temperature is too high, the temperature rises too fast when the glaze vitrifies, and the glaze surface "boils" to form an orange peel glaze.