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| Glossary |
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| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
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Industrial Scrap:
Any plastic resin or products, such as factory regrind and plant scrap, recycled outside of the primary manufacturing facility. Also referred to as post-industrial or pre-consumer plastics. (1995 post-consumer plastic Plastics Recycling/Recovery Rate Survey, Glossary of Terms, R.W. Beck & Associates).
Injection Molding:
A process that involves transmitting melted resin into a mold's cavity; the molten resin then cools and solidifies, and the finished piece is ejected from the mold. (Modern Plastics Encyclopedia 1995).
Impact Strength
Impact Strength characterizes material behaviour under high speed loading. Pendulum and falling weight type testers are applied here. Specimen can be either plaques, notched or unnotched bars or parts of finished products. There are several impact methods like Charpy impact test, instrumented puncture test and tensile impact test. Generally impact test shows the energy which is needed to break or puncture specimen under specified conditions. In some tests it is possible to accurately record force - deformation transient curves and calculate specific parameters describing material behaviour under impact loading.
Injection molding
A repetitive process in which plastic is melted and injected into a mold cavity where the article is cooled down. After cooling, the mould opens and the article is ejected. ). The melt is prepared in a screw setup similar to an extruder; the screw acts in melting and homogenizing the polymer while slowly retracted to build up the melt reservoir necessary for the injection step. Then, the screw is used as a plunger in a forward movement to inject the melt through the runner , a manifold in case of a multiple mould and the gate into the mold. In the injection molding process, filling of the mold and solidification takes place partially at the ssame time, resulting in a very complex morphology in case of semicrystalline polymers.
Ionic polymerization
A chain polymerization in which the kinetic-chain carriers are ions. Usually, the growing chain ends are ions |
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