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A CAREER IN PLASTICS TECHNOLOGY

A plastics technologist works with the manufacturing of raw materials, the conversion to and quality control of final plastic products.

NATURE OF THE WORK

The plastics industry is very closely linked to the chemical industry, as its raw materials are chemicals mainly derived from oil, coal or natural gas. A plastics technologist can be employed in different areas of the plastics industry and the nature of the work will differ considerably. The common areas are:

Plastic raw materials industry
The production of raw materials is the starting point of the whole manufacturing process. A technologist is involved in the supply, production, research and development of raw materials.

Converting industry
The finished product is made by a wide variety of processes from the raw material supplied. The main conversion processes are:

  • Injection moulding: This method is probably the most frequently used method of moulding plastics. Raw material is fed into a heated barrel, pushed forward by a rotating screw, softened by heat and injected into a mould. The part cools in the shape of the mould, is ejected and the cycle repeated. Products are consumer items such as containers, pens, bottle caps as well as hubcaps, bumpers and swimming pool cleaners.

  • Blow moulding: This process is used for the manufacture of hollow articles such as bottles and containers. A tube is extruded vertically downwards and, while it is still hot and pliable, a two-part mould closes around it, closing off the bottom end of the tube. The plastic tube is inflated with air till full contact with the cold mould is established.


  • Film blowing: A molten plastic tube is extruded through a circular gap. The thin molten plastic tube is formed to size and thickness by a big air bubble that is maintained inside the tube. The thin film can be made into plastic bags.


  • Extrusion: The plastic raw material is fed into a heated barrel and pushed through different dies by a helical screw to form long continuous products such as pipes, gutters, hoses, sheets, monofilaments and window frame profiles. The hot products are cooled by air or water and coiled or cut into lengths that can be transported.

There are many more conversion processes such as reaction-injection moulding, casting, calendering, foam casting, rotational moulding, filament winding, etc.

Important facets of the manufacturing process are process development, quality control and production management. The work can also include design of new articles, design of the moulds and the machinery to make the products.

Quality Control

This is where a plastics technologist plays an important role. This job entails the evaluation of polymeric compounds and products, the compilation of specifications and liaison between the raw materials manufacturer, the converter and the end user.

A plastics technologist may also be involved in market research, product development, technical supervision, production, sales, administration and advertising, as in any other industry.

A technologist can work either in the laboratory or on the shop floor, and qualifications together with suitable experience can lead to promotion, to higher levels of responsibility and to management.

REQUIREMENTS

Personal
A plastics technologist must have an interest in and an aptitude for technical and scientific work. He/she must have an attentive, inquisitive and patient nature, as some experiments have to be repeated numerous times. Management skills are important for promotion purposes.

Educational
A Matric Certificate with mathematics is the minimum entry requirement for the diploma course. Matric exemption with mathematics and science is required for a BSc degree.

TRAINING

The University of Stellenbosch offers a one year full time BSc (Hons) degree in Polymer Science. For admission requirements and course content, please have a look at http://www.sun.ac.za/polymer.

The University of Stellenbosch offers a one year full time BSc (Honours) degree in Polymer Science. For admission requirements and course content, kindly visit http://www.sun.ac.za/polymer.

The National Diploma in Plastics Technology is a three-year sandwich course, or three semesters full time together with three semesters on-the-job training. The Cape and Port Elizabeth Technikons offer this course. Subjects include physics, organic chemistry, plastics technology and statistics. The Pretoria Technikon offers a Higher National Diploma as well.

Plastics|SA (previously known as the Plastics Federation of SA) offers training on raw materials, the various plastics processes, etc. For more information on training courses, contact Renee or Belinda at (011) 314 4021 or Belinda.neethling@plasticsSA.co.za

PROSPECTS

The plastics industry is a fast-developing and dynamic industry. There are approximately 35 000 employees working in about 1 700 companies in South Africa. New applications for plastics are continuously being found. This requires the developing of processes and materials and provides an ongoing challenge to a plastics technologist.

Further information
Enquiries can be addressed to:

  • Institute of Polymer Technology
    Pretoria Technikon, Private Bag X680, Pretoria, 0001.
    Tel (012) 841 4972, Fax (012) 841 4924.


  • Institute of Polymer Science
    University of Stellenbosch, 7600,
    Tel (021) 808 3172, Fax (012) 808 4967.


  • Plastics| SA
    Private Bag X68, Halfway House, 1685.
    Tel (011) 314 4021.

GENERAL INFORMATION ON THE PLASTICS INDUSTRY

  • Approximately 700 000 tonnes of locally produced polymers are made from monomers derived from coal gassification.


  • The local industry is highly dependent on imports of polymers (grades and types not locally made).


  • Whilst plastics play a part in virtually every sector of the economy, i.e., all the usual plastics markets, packaging dominates the local plastics industry, accounting for 50 per cent of the market.


  • The plastics industry has many environmental initiatives in place to encourage the recovery, re-use and recycling of plastics. For more information visit www.plasticsinfo.co.za