100% sea plastics
In total, 300,000 to 400,000 of the spacers are required for one tunnel alone. For these quantities it pays off ecologically to use recycled materials. Oldroyd uses 100% sea plastics, consisting of roughly half PP and half PE. The remnants of broken fishing nets and plastic ropes are collected on the coast of Norway by specialist companies and crushed, washed, and regranulated. The subtle fish scent does not need to be removed for the tunnel construction.
The APCplus machine feature is very helpful for the changing material compositions and resulting viscosity fluctuations. It ensures a very constant shot weight by adapting the switchover point and the pressure level from shot to shot.
Safe "ghost shifts" at the weekend
Efficient automation is required in order to be able to produce plastic products competitively in Europe. All Oldroyd machines are therefore equipped with oversized LRX robots from KraussMaffei. With their very long vertical axle, these large quantities of manufactured products can be stacked up – starting with a ground-level pallet up to a height of two meters. In the case of the tunnel spacers, this volume covers the production of one (unmanned) weekend exactly.
2-component project with TPE
A new CX with two-component equipment will soon go into operation at Oldroyd because John Cheetham has once again made a development that will change tunnel construction: a 2-component platen, called RoadStar, which is secured on the steel rods that connect the concrete wall and the rock layer. Up to now these platens were made of metal and corroded accordingly, which is why maintenance is required and a replacement after roughly 50 years. Whereas the RoadStars were estimated to have a service life of 120 years in special aging tests. This alone saves a lot of resources. The RoadStar was already tested by Oldroyd customers and was also widely accepted because the integrated TPE layer has a sealing effect, while the other side (made of PE) is impact-resistant. Success on the market and the correspondingly high numbers of units will mean more 2-component machines will make their way north from Munich.
For more information, visit kraussmaffei.com.