Manufacturers and suppliers to the infrastructure sector are taking matters into their own hands by investing in back-up power to mitigate extrusion production losses caused by load shedding and general power failures. DPI Plastics, a leading manufacturer of PVC and HDPE water reticulation and drainage pipe and fitting systems, is installing power generators and back-up UPS battery systems at both its Roodekop, Johannesburg and Bellville, Cape Town manufacturing facilities. Renier Snyman, technical manager at DPI Plastics, stresses the serious repercussions of any unplanned load shedding or power outages at its main Roodekop plant, in particular: “When the power goes down, the extruder stops, leaving a certain quantity of PVC inside the machine.” In the case of the 630 mm bore pipe extruder at Roodekop, this equates to a staggering 750 kg of material. This PVC material has limited heat stability, which means it starts to degrade as it cools down. “When this happens, you cannot simply heat up the extruder and start the process again once the power comes back on. Basically you have got to strip the machinery first and break the PVC out of the tooling. Once the tooling and machinery are clean, it then has to be reassembled and heated up to the correct temperature before you are able to restart the line,” Snyman explains.
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