Raw materials selecting

Other Types of Portland Cements. White Portland cementis standard Type I or III Pordand cement with raw materials selected and controUed to have negligible amounts of Hon and manganese oxides, which impart the gray color. The white Pordand cement is used in decorative and architectural appHcations like precast curtain waUs, terra22o surfaces, stucco, tile grout, and decorative concrete. 

The final product has a low ash and/or low iron content achieved by raw material selection or special processiag. 

Processing is key to the reproducible manufacture of ceramics. The tolerance of a finished ceramic to defects determines the raw materials selected, and the control that must be exercised during processing. More expensive advanced ceramics require higher quaUty, more expensive raw materials coupled with more carefully controlled manufacturing processes. 

Although the source of raw materials may not be at the plant site, it is an e.xtremcly important factor in the ultimate location of the plant. Process development work and economic studies will indicate the minimum standards for raw materials selection. When these standards have been determined, all possible sources of acceptable raw materials can be located and a detailed analysis can proceed. 

The term quality control has been widely and loosely employed in the frozen food industry. In the dynamic sense it means the application and control of those techniques of raw material selection, handling, processing, warehousing, and distribution which are known to be required for the production and maintenance of a given level of product quality and condition. 

Are any impurities in the feed tied to the waste streams If so, try source reduction. Is there a scope for better raw material selection This would achieve a source reduction which is number 1 in the p2 list given in Table 6.1. 

Do the products have a toxic component Can this be minimized by proper raw material selection ... 

Raw material selection for shortenings has been influenced by availability and economics. These factors were the main reasons for the development of lard substitutes, introduction of pure vegetable shortenings, major processing improvements, the development of additives to fortify specific performance characteristics, and most of the other changes. Table 1 give U.S. information on fats and oils used... 

Bleaching and color reduction are important in removing contaminants and also in improving the perception of quality in textile sizing applications. For example, the application of bleached tallow or bleached hydrogenated tallow on textile fabrics is preferred over the use of darker fats. When color requirements become important in the use of rendered fats, processors must pay careful attention to raw material selection. An important analysis of the rendered fat is R B color, or refined and bleached color. 

Several challenges have been encountered underway and important issues include raw materials selection, development and production of a suitable alumina support as well as selection and adaptation of conditions and equipment for impregnation, drying, calcination and reduction. Early production batches showed clearly inferior performance compared to laboratory samples. This challenge was resolved in collaboration with the catalyst manufacturer after detailed investigations into the basic mechanisms involved in the scale-up. 

The brewer and his customer make a subjective assessment of beer flavour each time they taste but for a more objective appraisal it is usually desirable to submit the beer, with suitable controls, to a taste panel. Taste panels may be used to (/) select qualified judges, (//) correlate sensory with chemical and physical measurements, (Hi) study processing effects, maintain quality, evaluate raw material selection, establish storage stability, and reduce costs, (fv) evaluate quality, and (v) determine consumer reaction [Ij. The types of test used include (/) difference tests, (ii) rank order, (Hi) scoring tests, (iv) descriptive tests, (v) hedonic scaling, and (v/) acceptance and preference tests [1]. Difference tests are most commonly used in the brewing industry, the results of which are readily analysed by statistics. Several forms of difference test are used. The A-not-A form of test is perhaps the simplest. Assessors are first familiarized with a standard A and then presented, in a random manner, either with A again or with the comparative sample B. In the paired-comparison test two samples are presented simultaneously (AA, AB, BA, or BB) and assessors report either there is a difference or there is no difference . 

Much work has been done in this field and it has been concluded that there are several aspects which are important, such as raw material selection, production techniques and working environment. Current recommendations to minimise the likelihood of blistering are ... 

It should also be mentioned that the most important prerequisite for a good food product, is that the raw materials selected should be of the highest quality available and it is imperative that it has been handled according to good manufacturing practice from the point of harvesting. 

Polyester acrylates produced by direct esterification or transesterification of residual hydroxyls are lower viscosity and thus offer a handling advantage. Due to the strong polyester use in Europe, these products were primarily developed by European suppliers. Properties of these resins can vary significantly depending on the raw material selection. Cure speed is generally slower than epoxy acrylates possibly due to their inability to form carbinyl radicals via hydrogen abstraction. 

Raw Materials Selection. The selection of the appropriate raw (precursor) materi s is the first and critical step in the manufacturing process. It determines to a great degree, the properties and the cost of the final product. The characteristics of these raw materials such as the particle size and ash content of cokes, the degree of carbonization of pitch, the particle structure of lampblack, and the impurities and particle size of natural graphite must be taken into account. 

The application of genosensors in food industry could lead to immense improvements in various food industry processes. These devices can be used in the raw material selection. 

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