Advantages and disadvantages of using polythene bags

Full Answer Since plastics are lightweight and sturdy, they can be conveniently used to transport goods.

Advantages and disadvantages of using polythene bags

The purpose of the process is to separate these fractions from each other as completely as possible, with the least possible expense and under conditions rendering the best possible products.

Fish can be reduced to meal and oil in a number of ways. Common to all methods of practical importance are the following processing steps: This chapter deals in some detail with the most generally practised method of large-scale production.

A more cursory description is given of small-scale processing and plants designed to handle small and irregular landings of fish or to yield products with special properties.

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Although the basic principles of the process may appear few and simple, a variety of elements is required to make a smooth running and profitable factory. There are also different types of equipment that will do the same job but in different ways. The number of options have increased considerably during the last years, particularly in the fields of energy saving, automation and environmental protection.

Advantages and disadvantages of using polythene bags

The prospective manufacturer should therefore devote ample time and attention for consultations with the most competent suppliers of machinery and complete factories, before making his final decisions on layout and equipment.

Here are some factors that need special consideration at the planning stage. The most important prerequisite for a profitable fishmeal project is an ample and regular supply of raw material at an acceptable price.

Length of season, that is how many days per year the plant may be in operation, is of the utmost importance for the profitability of the venture. Furthermore, the longer the season, the greater the weight that should be placed on measures to reduce the variable costs, and the more that should be spent on investments to save labour and energy and to ensure higher yields and quality of the products.

Another important point relates to the size of plant needed for the amounts of raw material in question. Capacities given by the equipment manufacturer, particularly for the cooker and press installation, may serve only as indicators at the preliminary discussions.

The yield is an empirical value entirely dependent upon the nature of the raw material to be processed, its size, freshness and texture. The composition of the raw material expressed in terms of dry matter, protein and fat, will determine what yield of products may be expected.

The fat content is of special importance at the planning stage, because it will decide whether it will pay to install equipment for the recovery of oil, besides telling what yield of oil may be expected.

Furthermore, they eliminate a serious pollution problem that today appears unacceptable, particularly in the vicinity of densely populated areas.

For small factories and irregular operation, omission of evaporators may sometimes be justified, but a final decision on this point should be taken only after careful calculations have been made and the pros and cons thoroughly evaluated.

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Location of the plant relative to habitation and closed harbours is another feature of the utmost importance for trouble-free operation. Public regulations protecting the environment against undesirable pollution of air and water should be carefully studied, as these will affect the selection of equipment and factory premises and determine the amount necessary for investment in unproductive installations for odour abatement and cleaning of waste water emissions.

The main part of the sludge in the press liquor is removed by centrifugation in a decanter and the oil is subsequently removed by centrifuge. The stickwater is concentrated in multi-effect evaporators and the concentrate is thoroughly mixed with the presscake, which is then dehydrated usually by two-stage drying.

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The dried material is milled and stored in bags or in bulk. The oil is stored in tanks. Figure 2 shows the flow diagram of a typical fishmeal and oil plant. As already pointed out, there are alternatives to this layout and also different types of equipment to choose among for some of the unit operations.The disadvantages of plastics: Plastics bags are make of a non-renewable resource, which gives us more reasons to use recyclable shopping bags.

Plastic bags are also flimsy and do not sit as well as either paper or cloth. They are a hazard to wildlife animals, if they are not disposed properly. Jute is a long, soft, shiny vegetable fiber that can be spun into coarse, strong threads.

It is produced primarily from plants in the genus Corchorus, which was once classified with the family Tiliaceae, and more recently with heartoftexashop.com primary source of the fiber is Corchorus olitorius, but it is considered inferior to Corchorus capsularis.

" Jute" is the name of the plant or fiber that. ´╗┐Advantages and Disadvantages of Renewable Fuels Solar Energy: Advantages: Energy is free although there is a building cost.

-Causes no pollution, however, energy may go . THERMAL MANAGEMENT A newborn baby is homeothermic, but his ability to maintain his body temperature can be easily overwhelmed by environmental temperatures. Sources: 1) Ffolliot and Thames 2) Doran et al.

Advantages and disadvantages of using polythene bags

As explained later in this chapter, modern thinking has defined low MC, low temperature and low oxygen pressure as the three most important constituents of the storage conditions which man should provide to maximize seed longevity in . Advantages and Benefits of Using Polythene Packaging. When you choose to use polythene packaging for shipping or for storing away your own items, one of the major advantages of doing so is that polythene packaging is one of the most durable and lightweight options for packaging in existence.

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