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3. Implementation
3.1 Injection
PP injection conditions depend essentially on the dimensions of the object to be manufactured. Injection pressure ranges from 80 to 200 MPa; injection temperature can vary from 210 to 280 ˚C; the mold is generally at room temperature. Shrinkage of molded parts is between 1 and 3%.
Today's injection molding machines, with their very short cycle times and the development of suitable grades, enable the injection of thin-walled objects such as butter or margarine packaging, or yoghurt pots. Injection molding thus competes with thermoforming.
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Implementation
Control and designation
Statistical and economic data
1.Production trends
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France
In thirty years, French polypropylene production has risen from zero to 1.4 Mt/year (figure ).
References
Also in our database
Norms and Standards
French and European standards http://www.afnor.fr
- Plastics – Determination of water absorption. Classification number T 51-166 - NF EN ISO 62 - 05-99
- Plastics – Test methods for determining the effects of immersion in liquid chemicals. Classification number T 51-029 - NF EN ISO 175 - 09-00
- Plastics – Determination of bending properties. Classification number T 51-001 - NF EN ISO 178 - 05-03 ...
Websites
List of polypropylene suppliers http://www.ides.com/generics/PP/PP_suppliers.htm
Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
Borealis http://www.borealisgroup.com
DOW Plastics http://plastics.dow.com
Exxon Mobil http://www.exxonmobilchemical.com
...
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