Glossary PP
This glossary contains an overview of the most used terms in the polypropylenes business.
Searching our database can be done by using the text search. All relevant matches for your query will be returned.
Alternatively you can browse the terms starting with a specific letter you choose.
| Enter Name |
Alphabetical Search |
|
|
| I |
| Impact strength |
The amount of energy per unit thickness required to break a film by hitting.
Impact strength is usually promoted by a low density, a low MFI and higher comonomers. It might be more accurately defined as the ability of a material to accept a sudden blow or shock without fracture or other substantial damage, as measured by standard impact-testing equipment (FEM). It is temperature-dependent. Impact strength might be regarded as toughness at high test speeds (see: brittle and tough).
|
| Injection Moulding |
A repetitive process in which plastic is melted and injected into a mould 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 homogenising 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 mould. In the injection moulding process, filling of the mould and solidification takes place partially at the same time, resulting in a very complex morphology in case of semicrystalline polymers.
|
| IR barrier |
The property of reducing heat losses by preventing IR-transmission.
|
| ISO |
Adhesive = a general term for all non-metallic materials that can join solids by surface bonding and internal strength (adhesion and cohesion)
|
