Blown film dies and equipment | machinery
Blowing in the wind
The huge bubble of a blown film line is by far the most obvious element of the production process, but often it is the tool ‘hidden’ beneath the bubble that determines many of the qualities of the final film. Brampton Engineering says that its SCD 4.0 is the
only co-extrusion die that enables producers to process each polymer in a multilayer barrier film structure at its ideal temperature. Four different options allow temperature differences
between adjacent layers ranging from 15° to 90°C, minimising degradation. As a direct result, SCD 4.0 leads to better quality film, faster job changeovers, less purge scrap and die cleaning, says the company. SCD 4.0 is available for both AeroFrost blown film and AquaFrost water-quenched film lines. Allied to this, the company says that its single-inlet
Vector air ring streamlines flow and reduces pressure losses and temperature rises – resulting in more efficient use of chilled air, to achive higher output on a blown film line.
Rather than split the flow of air from the chiller using a manifold to distribute it around the entry, Vector has a composite volute that is precisely contoured to achieve uniform airflow velocity around the film bubble – without excess energy, pressure losses, or an untidy mess of hoses.
www.filmandsheet.com
Advances in dies and associated equipment – such as cooling rings – are helping to maximise production and quality of blown film. Lou Reade reports
Infrared imaging proves that the film cools as quickly – and with better uniformity – at much lower blower speeds. The air ring lip needs to control how the chilled air flow affects the film bubble, to allow process technicians to secure stable ‘bubble lock’ with a wide range of films. The Vector dual lip provides automated control of lip positions without affecting flow rate, making it easier to set up and optimise, with a wider operating window, says Brampton. All operating parameters including lip positions are
set with Italycs or a stand-alone control system, making the ideal setup for each product repeatable. Gary Hughes, CEO of Brampton Engineering, said: “I
am confident that Vector and SCD 4.0 will revolutionise the blown film industry.”
June 2017 | FILM & SHEET EXTRUSION 29 Main image:
Davis-Standard has expanded its blown film
die rebuild and cleaning
services in the UK
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