Tires size designations used

Three basic tire size designations are used ... 

Tire mold design initially begins with determination of the inflated dimensions of the required tire size. By use of inflated tire and growth characteristics of the tire, preliminary plyline and mold dimensions are computed (Figure 14.6). Once the mold boundary dimensions, location of the plyline, and tread width and depth are known, the contours of the tread, shoulder, sidewall, and bead components can be established. These dimensions and contours are developed using computer-aided engineering techniques (Figure 14.7). 

Tire mold design initially begins with determination of the inflated dimensions of the required tire size. By use of inflated tire and growth characteris-... 

Thermal expansion during heating of the rollers may be considerable. Therefore, segmented designs that allow for expansion by incorporating a suitably sized gap between the segments at room temperature are nearly always used for hot applications, even if, from a wear point of view, a steel is selected that could be formed into roll tires. 

Carbon black finds its way into many products inks, paints, paper, fertilizer, plastics, and explosives to name a few. By far the major use, however, is in automotive tires which consume 65% of the total production. The present day tire contains roughly 1 pound of carbon black for each 2 pounds of rubber and provides both the bounce and wear characteristics desired by the user. The properties carbon black imparts to rubber compounds are so critical that there are currently more than 20 classified grades of oil blacks. Most distinctions between grades are mainly a function of particle size and structure, although surface chemistry is sometimes a factor for specialty uses. The more important grade designations are illustrated in Table I. Each of those listed are also subdivided according to their structure levels. 

Depot wheelchairs are intended for institutional use where several people may use the same wheelchair. Generally, these wheelchairs are inappropriate for active people who use wheelchairs for personal mobility. Depot wheelchairs are designed to be inexpensive, accommodate large variations in body size, to be low maintenance, and often to be attendant propelled. They are heavy and their performance is limited. A typical depot wheelchair will have swing away footrests, removable armrests, a single cross-brace frame and solid tires. 

The majority of baffles are flat and as a result are very inefficient from a strength standpoint. Deflection is the governing case for flat plates loaded on one side. Tire preference is to have unstiffened baffles, and they should always be the first choice. This will be acceptable for small baffles. However, lor larger baffles, as the baffle thickness becomes excessive, stiffeners offer a more economical design. Therefore stiffeners are frequently used to stiffen the baffle to prevent the thickness of the baffle from becoming e.xces-sive. The number, size, and spacing of stiffeners are dependent on the baffle thickness. selected. There is a continual trade-off between baffle thickness and stiffener parameters. 

However, a correctly specifically manufactured and configured stoker is an excellent combustor of cellulose waste such as (1) wood—shredded trees to sawdust (2) garbage—refuse-derived fuel (3) bagasse—sugarcane residne (4) industrial residue—paper, plastics, and wood (5) furfural residue (6) peanut shells and (7) shredded tires. Most of these fuels can be bnrned without auxiliary fuel with proper attention to fnel moisture, design heat release, combustion air system design, and preheated air temperature. Cogeneration and the emphasis on renewable fuels have driven increased use of these fuels. Size distribution of the fuel is important from the standpoint of efficiency, availability, and low emissions. 

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