"Experienced dry-press operators have long known that when they slow down their presses, to the proper speed they are able to exert more pressure on a wetter mix with out pressure cracks becoming apparent. When a clay mix is compressed in a dry-press there is a gradation of the pressure exerted, from the rams to the center, causing in some cases a soft centered brick. "Shelly brick", are undersirable sic because they do not have uniform physical properties through out. This weakens their structure, due to unequal stresses developed in drying and fireing sic. The defective structure of dry-pressed brick has been attributed to many other causes, such as uneven moisture distribution, improper grain size gradation, grain size segregation, occluded air, plasticity of the mix, degree of pressure, and rate of compression. All of these factors have their effect on pressure transmission in one way or another, consequently we attribute the imperfect structure of some dry-pressed ware to inadequate and non-uniform pressure transmission to all parts of the ware. A review of the literature discloses no imformation sic or data pertaining to the effect of variation of time of applied pressure on dry-pressed ware. It is, therefore proposed to make a study of the effect of variation of time of applied pressure on pressure transmission in dry-pressing"--Introduction, pages 1-2.
Dodd, Charles Mitchener
Materials Science and Engineering
B.S. in Ceramic Engineering
Missouri School of Mines and Metallurgy
ii, 18 pages
© 1931 Robert Edward Lee, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Pressure -- Testing
Refractory materials -- Analysis
T 0000 14
Print OCLC #
Electronic OCLC #
Link to Catalog Recordhttp://laurel.lso.missouri.edu/record=b2497718~S5
Lee, Robert Edward, "Pressure transmission in clays affected by time of pressure application" (1931). Bachelors Theses. 53.