Recycling of plastic scrap

Τίτλος

Recycling of plastic scrap

Θέμα

Recycling

Waste metals

Metals

Δημιουργός

Xanthos, Savvas

Πηγή

Higher Technical Institute

Το πλήρες κείμενο είναι διαθέσιμο από το Υπουργείο Ενέργειας, Εμπορίου Βιομηχανίας και Τουρισμού.

Εκδότης

Library of Cyprus University of Technology

Ημερομηνία

1992

Δικαιώματα

Απαγορεύεται η δημοσίευση ή αναπαραγωγή, ηλεκτρονική ή άλλη χωρίς τη γραπτή συγκατάθεση του δημιουργού και κάτοχου των πνευματικών δικαιωμάτων.

Μορφή

pdf

Γλώσσα

eng

Τύπος

text

Αναγνωριστικό

MED0162

Σύνοψη

The present day hysteria over control and improvement in the environment can blind us to the fact that through out history man has always practiced a certain amount of recycling of scrap metal and other waste materials.
Certainly ever since he first discovered metals, originally those which occurred naturally and some what later those which occurred by reduction in the primitive fires, he practiced recycling of waste, partially reduced ores,
or spare metal which he produced at the time of making a finished weapon, or articles such as jewellery, nails, ploughshares or horseshoes etc. There are two reasons for this. First that metals have always been relatively valuable in comparison with many of the other materials which
man uses, and the second, and probably more important reason, is that it is relatively easy operation to collect scrap, particularly at the source of manufacture, and recycle it by simple melting operation. Possibly the
earliest reference to recycling is the biblical admonition to beat swords into ploughshares and spears into pruning hooks. (Isaiah Chapter 2, verse 4).
Two main reasons exist for this early awareness of recycling metals.
a) Metals, by their rarity to early man, not yet master to large scale extraction, have always been relatively valuable compared with other materials,
b) Engineering practice has in the past, used solid metal which, especially as in-process scrap, may easily be collected and reclaimed by simple melting. Modern practice has reversed this trend, possibly because of the
increasing value of metals; consumer goods now avoid the use of large pieces of integral metal for the above reason.