Bone porcelain glaze color defects on 10

6, shrinking flower meaning: also called knit flower, bone China products picture crease, flower surface morphology change belongs to bone porcelain flowers surface defects in decals and baking process. The reason: 1) Paste the careless operation; Applique color paper buckling does not exist when bubbles after firing leveling with branches and leaves appear to be out of shape. ( 2) Burn too close, or heating up a nasty, bone China take the water and carbide hard to do, cause shrinkage. To overcome the way: ( 1) Strict and careful operation, the paste paper, buckling leveling found bubbles and wrinkles should be painted a layer of pure alcohol make color paper put into prison. ( 2) Color burn preheat phase, temperature shoulds not be too hurry, so that the moisture and carbide remove clean, with a bottom mark cut bone China products to use ceramic pads dozen yards to burn. ( 3) Ceramic flower face design, making paper flowers, unfavorable and overmuch, multicolor levels to minimize the color paper when printing overprint level. 7, the crack ( The river) Meaning: also called river. Bone porcelain glaze and bone porcelain body presents the crack at the same time. General bone porcelain items from a variety of ceramic products is shallow, flat, belongs to fry glaze, produced in the bone porcelain bake process. The reason: 1) After cooling, rapid bone porcelain color porcelain is heated, red furnace, baking flowers open prematurely makes the cold air entering the furnace: bone China products because of the quenching crack, kiln or jin kiln cooling zone are too short. Bone China products, not out of the kiln in a cold cold crack. ( 2) The fire, rapid temperature rise, thermal shock is one of the principal causes of river-crossing, barbecuing bigger bone porcelain varieties, not put size on color porcelain, which causes large bone China compression or not easy heat dissipation. To overcome the way: ( 1) Burn big furnace temperature is too high, heating up too nasty, big bone porcelain with a joist overlap, and in order to avoid pressure and pan of the dragon. ( 2) Slow cooling, round roof lifted it too early, slow cooling, jin furnace can't dragged a case. 8, lead melting quantity to exceed bid meaning: the human body from the extraction of trace lead in food every day, at the same time from the urine excretion is about 0. 2 - 04 micrograms of lead, so the amount of lead in normal human body in balance, even more than twice as many as usual doses are also occasionally there is no danger. Only when a large number of inhaled lead damage balance formation of lead poisoning. In China and most parts of the world is in 4% acetic acid solution at room temperature 20 ℃ under 18 hours after dipping lead precipitation amount shall not exceed seven percent per milliliter ( Cadmium is 4 parts per million (PPM) or 7 PPM, 。 Traditionally ceramics ( Bone China) Glaze color on coloring material is to use lead silicate, borate containing lead or alkali lead silicate as cosolvent, etc. Lead insoluble in dilute hydrochloric acid and sulfuric acid, soluble in nitric acid, organic acids ( Especially acetic acid) And lye of daily-use ceramics ( Bone China) Don't want to have the lead in the process of using dissolution. Because lead is harmful to human body and lead poison is accumulating time will show. Ceramic ( Bone China) Lead the cause of the dissolution. Pigment is used is leaded to solvent and bone porcelain color paper printing of desiccant is white dryness oil that may contain lead. Earthenware pottery or lead glaze is fusible at low temperature with boron glaze. Low temperature baking flower pigment layer of loose, easy to acetic acid dissolution. Ceramic ( Bone China) Picture in the dissolubility of lead acid with reduced with increasing of the acid solution PH value, also along with the increase of etching time and increases with the increasing of reaction temperature. In cosolvent, alkaline lead silicate dissolubility of lead is higher than the binary lead silicate, containing alkali lead silicate, dissolubility and lead to k lead silicate than lead silicate sodium. Moreover bone porcelain product capacity and the proportion of flower surface area to lead quantity also have relations. Ceramic products such as large capacity area is small. The lead content is low, the opposite is high. So the principal causes of dissolubility of lead cadmium exceeds bid analysis is as follows: & ndash; Tangshan bone China custom wholesale to be continued. 。 。 。 。 。