Thursday, 26 September 2013

Project Report On Design of a Manually Operated Paper-Recycling Machine

               Paper is one of the most important products ever invented by man. Widespread use of a written language would not have been possible without some cheap and practical material to write on. The invention of paper means that more people would be educated because more books would be printed and distributed. Industry would grow because all the plans, blueprints. records and formulae it uses would be written down and saved, together with the printing press, paper provided an extremely important way to communicate knowledge.

The primary source of raw material for production of paper is vegetable fibers, obtained mainly from plants. To ensure that the forest is not depleted of these woods, there is need to provide alternative source of raw materials, this therefore leads to the invention of the process of recycling.
Recycling, which is the extraction and recovery of valuable materials from scrap or other discarded materials, is employed to supplement the production of paper. The designing and fabricating of a used paper recycling plant is therefore a welcome development as it will ensure that the source of raw material for paper production is multiplied and also waste paper that could have constituted into wastes are recycled for various productive purposes.

Designing a manually operated paper recycling plant ensures that a cheap and non-complex method of production of paper product is guaranteed. This is the objective of this paper.

Methodology and design calculation
   Description of the Recycling Plant
   The designed of a waste paper recycling plant included the determination of the volume of the refiner, hydropulper and head box and also the selection of a convenient material for the construction of the individual units. The bulk of the parts of the plant were fabricated using mild steel, this is because it is the easiest to be joined among all other metals. It is a very versatile metal, necessitating its use by many industries for fabrication of process unit equipment. Apart from its versatility, it is also very cheap and readily available compared to other metals. Some basic properties of mild steel that enhance these qualities include (Howard E. B., Timothy L. G., 1985, Metal Handbook):
• Tensile strength: 430KN/mm;
• Yield stress: 230KN/mm;
• Percentage longatum: 20%;
• Tensile modulus: 210KN/mm3
• Hardness: 130APLS.

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