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1. Challenges and special features
The manufacture of large hollow bodies produced by extrusion blow-moulding comes up against three main difficulties:
achieve the desired thickness distribution: while a uniform distribution generally reduces weight, speeds up cooling and reduces the risk of deformation, certain parts of the part (weld areas, neck, base, mounting bracket, etc.) may require specific values that must be guaranteed;
obtain the geometry corresponding to the theoretical definition: the parts produced are integrated into their environment with tight dimensional tolerances that must be guaranteed throughout the product's life;
guarantee the properties (mechanical, watertightness, permeability, etc.) stipulated in the specifications: concern for people's safety and the quality of our living environment...
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Challenges and special features
Extrusion blow-molding
Bibliography
Software tools
FLUENT ANSYS http://www.ansys.com
BlowView https://extranet.imi.nrs.ca/english/Blowview
Events
International Trade Fair for Plastics and Rubber -- K Trade Fair, Düsseldorf, Germany http://www.k-online.de
Standards and norms
- Determining the melt flow rate of thermoplastics, by mass (MFR) and by volume (MVR) – Part 1: Normal method. - ISO 1133 - 2011
- Methods for determining the density of non-cellular plastics – Part 1: Immersion method, liquid pycnometer method and titration method. - ISO 1183 - 2004
- Determining tensile properties – Part 1: General principles. Part 2: Test conditions for plastics for molding and extrusion....
Regulations
EURO5/6
Regulation (EC) N° 715/2007 of the European Parliament and of the Council of 20 June 2007 on type approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information. Official Journal of the European Union, L171/1 (29.6.2007)
Commission regulation (EC) N° 692/2008...
Patents
Method for controlling wall thickness in extruded tubular synthetic-resin blank. US 4279857
Process for manufacturing a fuel tank equipped with an internal accessory. EP 2155469
Process and equipment for manufacturing a fuel tank provided with internal accessories. WO2007088200
Directory
Basell Polyolefine GmbH (high-density polyethylene)
BEKUM Maschinenfabriken GmbH (extrusion blow-molding machines)
BIELOMATIK (welding machines)
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