In the beginning stages of working on the potter’s wheel, many students encounter frustrations with cracking ware. Every potter is occasionally humbled by the sight of their favorite pot displaying a crack. In fact, the one constant when working with clay is that, at some point, something will crack. Fractures can occur at any time during the forming, drying and firing stages, or, in some instances, even many years later.
By definition, extrusion is “the act or process of shaping by forcing through a die.” When pelletizing or specialty-forming a product, one must give consideration to the advantages of extrusion. The various methods of extrusion include ram, pellet mill, and screw type, and “force” is applied by piston, rolls, or screw (auger), respectively.
A separator is a screening device designed to segregate smaller particles from larger particles, separate solids from liquids, or remove foreign matter. Sizing is the segregation of a variety of solid particles into separate groups containing comparable sizes.
When creating a stoneware clay body formula, one of the most important characteristics is plasticity. The unique attributes displayed by clay/water structures contribute to the plastic qualities of moist clay.
With a move toward leaner, more efficient manufacturing processes, the basics of glaze formulation and application should not be overlooked.
March 1, 2005
Over the past decade, and especially within the last several years, many manufacturers of tile, dinnerware and sanitaryware have begun embracing leaner, more efficient production processes in an effort to remain competitive. As part of these initiatives, some companies have installed new glazing equipment, modified existing kilns or installed new kilns to optimize energy efficiency, developed new glaze and body formulations, investigated and/or implemented new glaze application processes, developed specially treated glaze materials, or combined different application processes (such as dry/wet) to produce new effects. While these are all important steps, the basics of glaze formulation and application should not be overlooked.
While specific technical problems are often the most visible sign of an impediment in the production cycle of forming, glazing and firing functional pottery, such problems sometimes indicate a lack of planning in other less visible, yet highly crucial areas of the business. If these problems are not detected and corrected early, they can sink the entire company.
Forced-hot-air drying can extend the lifetime of plaster molds while saving ceramic manufacturers time and money.
March 1, 2002
Those in the ceramic industry often complain about the too-short life of plaster molds, along with their uneven absorption rates and long drying times at ambient temperatures. However, extensive testing* has shown that there’s a fairly simple, long-term and economical solution to these problems: forced-hot-air drying of molds. Properly designed forced-hot-air dryers save time, extend the life of molds and reduce the cost of each mold and finished piece.
Learn why the aerospace and defense industries are increasingly turning to silicon nitride, plus additional details about Ceramics Expo 2019, advice for ceramic manufacturers working with and in China, and more!