Glossary PP
This glossary contains an overview of the most used terms in the polypropylenes business.
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| C |
| Cast film |
Film obtained by extruding a melt through a flat die onto a chill-roll or into a waterbath.
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| Chemical resistance |
The ability of a plastic to withstand exposure to acids, oils, fats and other chemicals; a chemical property.
Chemical resistance is assessed by determining, for example, material loss and degree of swelling of a plastic in a chemical environment.
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| Coefficient of friction (COF) |
A measure of the resistance met by a (plastic) object gliding over a surface.
The COF is important for the slip properties of the film, mainly during confectioning on high speed packaging lines e.g. when the freshly produced empty plastic sacks have to be stacked.
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| Compound |
A mix of different materials, homogenised in a kneader, calender or extruder in the molten phase, where the resulting material has some new properties, compared to the basic materials.
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| Contamination |
Accidental penetration of foreign materials in a plastic, resulting in toxic or otherwise undesirable properties. Example: plastic granulate remaining in a bulk carrier after unloading and getting mixed with new material.
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| Copolymer |
Two monomers polymerised together to form a polymer
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| Creep |
Gradual deformation of a material under constant stress.
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| Crystallinity |
Regular arrangement of molecules.
All liquids and glasses are amorphous, high molecular weight polymers and rubbers also lack a definite crystal structure and a well defined melting point: they are considered to be high-viscosity liquids. Macromolecules never can be made completely crystalline, but only partially: small crystalline areas exist in an amorphous structure. Slow cooling of the melt promotes crystallinity. Crystallinity also refers to the volume percentage of the crystalline phase.
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