MACHIINERY | DIE DEVELOPMENTS IMAGE: SCHWING


of the lower body, with help from a colleague. Once the upper body has been lowered onto the pins – and the lift chains have become loose – there may still be a gap between the halves. To solve this, take two body


bolts, coat them with anti-seize (on the head, threads and both sides of the washers). Then, insert them into the centre of the die and hand-tighten them. Once the die bodies are together, start from the centre to insert the remaining body bolts. Finally, install the end plates onto the die


Above: Schwing’s Vacuclean system cleans multi-layer blown film die heads at around 450°C


down on a clean protected surface and turn it over. Once the halves are separated, they will start to cool quickly – so polymer should be removed as quickly as possible. Having one person clean each half of the die is recommended. Using compressed air, blow out each individual die body hole. Finally, remove the die lip adjusting bolts and clean, lubricate and reset them with help from the owner’s manual. Also, inspect flow surfaces and front edges of the die to see if anything needs repairing. Reassembly: before placing the upper body over the lower one, apply anti-seize to the dowel pins and place the shim stock on the die lip surface


with cleaned and anti-seized bolts, followed by the end seals and the end seal push plates. The end seals should be replaced with new ones every time the die is taken apart. Full instructions can be found on Nordson’s blog post – which includes a video.


CLICK ON THE LINKS FOR MORE INFORMATION: � https://reifenhauser.com � https://ikv-aachen.de � http://www.wsyu.edu.cn/englishindex.htm � www.schwing-technologies.com � www.nordson.com


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