Glossary PP
This glossary contains an overview of the most used terms in the polypropylenes business.
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| B |
| Barrier properties |
Ability of a material to resist the passing of small molecules or light. Barrier properties are important for food packaging, where e.g. oxygen transmission can cause food spoilage.
A plastic film is usually required to provide a barrier against one or more of the following elements: liquids, light, gases (mainly oxygen, nitrogen, CO2) odour/flavour, moisture. When the barrier is high, permeability and/or transmission off the substance will be low.
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| BCF |
Bulked Continuous Filaments
Endlessly spun yarns consisting of many filaments. The yarns are drawn and by a treatment after spinning, the yarns receive more volume, bulkiness. These yarns are mainly applied as carpet pile
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| Bio-degradable |
The phenomenon of a (plastic) material being completely broken down by micro-organisms.
Bio-degradability: the susceptibility of a substance to decomposition by micro-organisms; specifically, the rate at which compounds may be chemically broken down by bacteria and/or natural environmental factors.
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| Blend |
A mechanical mixture of different materials, in the solid phase.
Blends and compounds are used to combine the best properties of both components. Contradictory to a compound, a blend is a mix of pellets (granules); by contrast, a compound is a mix of molecules in every pellet.
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| Blocking |
Adhesion between two surfaces, due to surface conditions (softness, roughness)
Blocking is an important property in the confectioning of films, e.g. when flattened blown film, wound on reels, has to be opened, especially on high speed packaging lines.
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| Blown film |
Film obtained by extruding a melt through a tubular die under internal air pressure, by which the melt is blown into a bubble.
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| Brittle & tough |
A material is brittle if a small deformation causes it to break. A material is tough or ductile if it has a high elongation to break; toughness is the opposite of brittleness.
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