Display the bone China defect 4

3, take off a piece of bone porcelain surface spalling meaning: bone China products internal crack formation of interlining, some layer gap between big in fettling pressurized elastic feeling from time to tome, some are large peeling and bone porcelain surface arc shaped convex. The reason: 1) Article bone porcelain clay contains air spallation, mechanical kneading and manual kneading failed to eliminate when drilling, cutting too many blocks in practice, rubbing between bone porcelain clay pieces of air discharge. ( 2) Bone China products shape is not reasonable or use multiple clamping block is undeserved, local sunken into the deep, mud cake into the mold into the air cannot escape, local strengthening bone porcelain body surface, it is difficult to squeeze out the air, the convex part of the add blank 'frequent not closely combined with the original block, to press the uneven or insufficient, bone porcelain blank particles in gap between without extrusion billet with seal compression, instead of air drilling and the bone porcelain body inside. ( 3) The design of the stiffener when pressure due to uneven distribution is not reasonable and paste to make the middle layer contains empty ( 4) Bone China billet in the process of forming mixed with organic impurities or oily be soiled, can appear when high temperature firing local large peeling even burst overcome way: article out of mud in the air, at once cut article mud. And make the block weight slightly higher than the printed bone porcelain body weight, try to keep mud period of the original structure of directional arrangement. After cutting clods mastery, avoid the clods directly into mud cake put the bone porcelain mould billet for China and India. ( See print this chapter billet & other; Bone China variant & throughout; “ Bone porcelain crack & throughout; To overcome the way) 4, seam meaning: bone China model commissure show uplift columnar or flat cylindrical in shape and some are not uniform continuous ups and downs. The reason: 1) Printed side in excess of the prescribed thickness mud, mud pressure curve surface is higher than die while also exceeded printed bone porcelain body pressure, thus the edge of the particles is too tight, organization structure density than the bone porcelain body. ( 2) Joint, the applied stress, resulting in joint mud and slurry by latent after strong extrusion stress is larger, uneven contraction during high temperature firing. Or form not dense, thread sizes and depth when wet, and add the material more or less bone porcelain clay, uneven pressure of compact bone porcelain clay materials. Commissure without standing add the position of the adhesive paste, or mud added quantity is too big, did not make the joint of mud, and arc Angle too outstanding not, man-made seam infarction. Overcome: paring joint mud, check whether the joint is compact, and the loose mud of voids, porosity, adhesion to add bone porcelain clay compaction, loose surface and the gap is too big, are partly stripped adhesive mud. To stick to repeat when scraping knife smooth connection prevent the chatter vibration knife road interrupt and too much when you receive sword hanging over joint mud mud should be revised several times scraping prevent damage to the bone China feed quantity is too big body. In case of coarser particles and impurities, should pick them one by one and add bone China mud pressure make the material. To deal with excessive commissure bone porcelain body curve, make it soft. — Bone China hotel tableware to be continued. 。 。 。 。 。