banneredit
1,703
edits
PP (5): Difference between revisions
new images
(new logo) |
(new images) |
||
| Line 8: | Line 8: | ||
[[PP (5)]] can function as both a [[plastic]] and fibre type of thermoplastic. This allows for a vastly increased range of uses. It can be used as a fibre, such as in the manufacture of promotional tote bags and ‘bag for life’ shopping carriers. It is soft, malleable and has a relatively low melting point, making it very easy to be used in the injection moulding process, where it is supplied in pellets. It flows well too, due to its low melt viscosity<ref name="ADR" />. [[PP (5)]] can even withstand twisting motions of up to 360° without snapping and is very hard to snap as a result. High chemical and fatigue resistance adds to its durability and versality as a packaging material and thus it makes a good option for hinges and bottle tops attached to the main bottle by a thin layer of plastic<ref name="ADR" />. | [[PP (5)]] can function as both a [[plastic]] and fibre type of thermoplastic. This allows for a vastly increased range of uses. It can be used as a fibre, such as in the manufacture of promotional tote bags and ‘bag for life’ shopping carriers. It is soft, malleable and has a relatively low melting point, making it very easy to be used in the injection moulding process, where it is supplied in pellets. It flows well too, due to its low melt viscosity<ref name="ADR" />. [[PP (5)]] can even withstand twisting motions of up to 360° without snapping and is very hard to snap as a result. High chemical and fatigue resistance adds to its durability and versality as a packaging material and thus it makes a good option for hinges and bottle tops attached to the main bottle by a thin layer of plastic<ref name="ADR" />. | ||
Its one main disadvantage is that [[PP (5)]] is not conducive to being easily recycled. When it burns, it produces a chemical change that cannot be reversed<ref name="ADR" />.Re-heating polypropylene that has already been melted and formed results in it burining rather than being liquifies for a second time, thus other [[recycling]] or re-conditioning methods must be considered, at | Its one main disadvantage is that [[PP (5)]] is not conducive to being easily recycled. When it burns, it produces a chemical change that cannot be reversed<ref name="ADR" />.Re-heating polypropylene that has already been melted and formed results in it burining rather than being liquifies for a second time, thus other [[recycling]] or re-conditioning methods must be considered, at a significantly higher cost<ref name="ADR" />. | ||
It's low melting point also means that polypropylene is highly flammable and limited in its ability to withstand higher temperatures; it is also susceptible to UV degradation and oxidation. Finally, while polypropylene’s glossy finish makes it aesthetically pleasing and easy to handle, this exact same property also makes it harder to bond to other surfaces and materials, such as paints and glues. Alternative bonding methods, such as welding must be introduced when using polypropylene to make a joint or hinge<ref name="ADR" />. | It's low melting point also means that polypropylene is highly flammable and limited in its ability to withstand higher temperatures; it is also susceptible to UV degradation and oxidation. Finally, while polypropylene’s glossy finish makes it aesthetically pleasing and easy to handle, this exact same property also makes it harder to bond to other surfaces and materials, such as paints and glues. Alternative bonding methods, such as welding must be introduced when using polypropylene to make a joint or hinge<ref name="ADR" />. | ||
<br clear="all" /> | |||
<gallery widths=300px heights=200px perrow=3 caption="PVC Examples"> | |||
File:Plastic-cap.jpg|Plastic Bottle Caps (all rights reserved) | |||
File:Polypropylene Rope.jpg|Polypropylene Rope (all rights reserved) | |||
File:Polypropylene fabrics.jpg|Polypropylene Fabrics (all rights reserved) | |||
</gallery > | |||
====Properties==== | ====Properties==== | ||