Bone China forming 8

In consolidation process due to the bone China model to continue absorbing water, bone China body moisture content is declining, the bone porcelain body gradually shrinking due to water discharge, when bone porcelain body moisture content decreased to 19% ~ 20% ( The release point) To consolidate the end of the billet body easily taken from the bone China model. Bone China mold release: from the bone China model process of blank. Bone China mold release is a key point. Bone China premature release, bone porcelain body strength is not enough, the bone porcelain demoulding difficulty, and bone China after demoulding body easy to collapse; Bone China mold release too late, slab cracking occurs, in solid grouting forming bone porcelain body for demoulding, light can use compressed air to blow mold and the integration of a body, but cannot too big movement range, otherwise it's easy to have a crack phenomenon. Before operation main points: (1) of the grouting operation, first of all, to the bone China model inside and outside clean, and clamping seriously, do not use the seam big or other unqualified bone porcelain mould (2) the grouting, the grouting speed shoulds not be too fast, so that the air of bone China model along with the injection of mud discharge cannot be rushed up bubbles, lest make the body produces defects (3) note large bone China products, such as edges and shrink large parts, before grouting can be labeled in bone China model in the corresponding place silk, make the parts moisture movement speed to balance as far as possible, in order to prevent the cracking (4) should be the core forming bone China products, beforehand on the core and talcum powder, help release (5) master delicious pulp of the length of time, to ensure that the thickness of bone porcelain body. Pulp before 6 hollow grouting shall be based on vertical shaft axis of appropriate ceramic mold shaking, restore liquidity to mud, uniform discharge all landowners to small mouth bone China products, put a plasma velocity shoulds not be too fast, can't hear & other; Product & throughout; Voice, lest the bone China model to produce negative pressure, the bone porcelain body prematurely from model deformation or damage was caused by repair glue, need adhesive components should be slightly lower than the main bone porcelain body moisture content 2% ~ 3%. Forming the common defects of forming defects of grouting and its reason analysis are as follows. ( 1) Cracking cracking is a common defect of the grouting forming is mainly caused by shrinkage stress produced by uneven surface. Each part of the main reasons are as follows (1) bone China gypsum mould different degree of dry wet or local temperature is too high, water quantity and water absorption rate were different in green is not uneven contraction, causing cracking (2) the bone China shape design is unreasonable, each part of the products have different thickness, thickness of junction is too sudden or presence of plasma deposition, uneven shrinkage, causing cracking (3) working environment or mud when temperature is too low (4) grouting slurry interrupt again after injection, easy to form containing the air layer between the, cracking easily from this side (5) mud quality is bad, put enough time 6 plasticity clay dosage cruelly inadequate or excessive bone porcelain body within the mold storage time is too long, big and partial contraction cracking was not appropriate for the amount of electrolyte, sludge change & other; Crisp & throughout; ( 2) Deformation caused the main reason is as follows (1) each part of the plaster mould different degree of dry wet or local temperature is too high, water quantity and water absorption rate were different in green is differ, uneven shrinkage, uneven deformation (2) the bone porcelain model moisture, mold release (either early or late bone porcelain improper operation when parting, forcibly uneven, cause local deformation (4) use improper electrolyte, mud water too much, too large to cause deformation (5) type bone China design is bad, the cantilever support at the bottom of the part or side easy soft collapse deformation model USES, may surface with soap and water residues, etc. — Bone China gift to be continued. 。 。 。 。 。