PETpla.net Insider 05 / 2021

BOTTLE MAKING 23 PETplanet Insider Vol. 22 No. 05/21 www.petpla.net Figure 7.17 Air step 6. Before the exhaust valve can open, the high-pres- sure valve must close first. Figure 7.18 Air step 7. Now the exhaust valve opens and all air escapes. When troubleshooting the air pres- sure circuit, it is best to check the pressure diagram of the cavity that produces defective bottles. All modern rotary machines have these. A “sticky” preblow valve is often the cause of bottle problems and these screens show this very well. Please order your copy at the PETplanet Insider book shop: petpla.net/pe t- planet/book3 Stretch Blow Molding Third Edition by Ottmar Brandau € 130,00 374 pages © Copyright Elsevier 2017, 2012 INDUSTRY- LEADING SOLUTIONS FOR SUSTAINABLE APPLICATIONS Mold-Masters’ industry-leading Co-injection Multi-Layer BarrierTechnology offers proven processing capabilities for your sustainable applications. This includes the use of high content post-consumer recycled materials (up to 50% of total part weight) and a wide range of Bio-Resins. For more information, contact [email protected] Preserving Freshness • Maintaining Flavour • Extending Shelf Life