processing | Infrastructure pipe Right: Close
control of pipe wall thickness is a critical factor in
preventing overweight,
says Rollepaal
for the next 10 or 20 years and then re-test them. That will save a huge amount of money.”
Cut the scrap Helmuth Rijnhart, technical manager at Rollepaal, told delegates the importance of reducing scrap rates and overweight in pipe production. “Overweight is 100% loss – it cannot be recycled,” he
said. He said that an inability to control pipe wall thick-
ness led to pipes that used too much material. While exact control was impossible, he said there was an acceptable limit: less than 3% was an excellent performance, he said, while anything over 10% was a “serious challenge”. “The total value of material used per year is 10-20 times the value of the extrusion line,” he said. For this reason, he said that investing in ways to
prevent overweight could be paid back very quickly. He recommended that this was done in a number of
ways. Firstly, pipe wall thickness can be measured using a combination of rotating and static scanners, to give information in both the length and circumferential directions. At the same time, gravimetric loss-in-weight systems detect variations in material throughput, and continuous control-line loops allow line speed and conditions to be adjusted accordingly. Setting optimum output was also an important
factor, which can be achieved by letting the extrusion line control configure the settings – then determine optimum output based on product specification, line layout and factory conditions. Alarms and recommendations can also help – so
specific parameters might lead to advice like ‘mass temperature too high’ or ‘increase screw filling to 450g/ rev/hour’. ‘Big data’ – in which a large amount of information is
processed in order to glean greater significance from it – can find the root causes of problems. “Its conclusions will help to define recommendations
– which can increase the processing window and improve performance,” he said. lPlastic Pipes in Infrastructure was held in London in April. Conference proceedings are available by contacting conference organiser Nicola Charlesworth (
nc@amiplastics.com) on +44 117 314 8111, or by visiting this link.
https://www.amiplastics.com/events/event?Code=C808#7817
Real flexibility is: Building extruders according to requirement
• with top quality components • in any shape or arrangements • for any polymer • for low and high output • within short delivery • for low budget
info@conextru.eu |
www.conextru.eu
PHOTO: SHUTTERSTOCK
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56
