Length and density grading

Improved Regeneration Quality with Length and Density Grading... 

LDG, which stands for LENGTH AND DENSITY GRADING, is a new development in the management of spent catalysts. The objective of this new technology developed by Catalyst Recovery, Inc. is to pick out reusable catalyst particles from undesirable catalyst particles. The ability to efficiently segregate individual catalyst particles... 

A polypropylene pipe with an outside diameter of 80 mm is required to withstand a constant pressure of 0.5 MN/m for at least 3 years. If the density of the material is 909 kg/m and the maximum allowable strain is 1.5% estimate a suitable value for the wall thickness of the pipe. If a lower density grade of polypropylene (p = 905 kg/m ) was used under the same design conditions, would there be any weight saving per unit length of pipe ... 

The manufacture of MDF, with a few exceptions, dupHcates the manufacture methods for dry-process hardboard, described at length hereia. One exception to it is that most MDF is made ia the medium-density range, 640—800 kg/m although small amounts are made at lower or higher densities. Second, the vast majority of MDF is made with UF resia adhesives with resia requhemeats ia the 7—11% range, and wax is usually added at the 0.50—0.75% level. A small amount of exterior-grade MDF is made with isocyanate resia. 

Since the density of the target material is usually 7.85 g cnr3 (armor grade steel) one can only influence the penetration depth by the velocity, density and length of the penetrator. Table 7.2 summarizes the penetration depths depending on the penetrator material used (penetrator density). It is apparent why from a strategical... 

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