{"id":229,"date":"2015-12-02T14:56:52","date_gmt":"2015-12-02T14:56:52","guid":{"rendered":"http:\/\/www.plastikcity.co.uk\/blog\/?p=229"},"modified":"2026-03-04T09:19:53","modified_gmt":"2026-03-04T09:19:53","slug":"replacing-a-worn-plasticising-screw-shouldnt-you-be-upgrading","status":"publish","type":"post","link":"https:\/\/www.plastikcity.co.uk\/blog\/replacing-a-worn-plasticising-screw-shouldnt-you-be-upgrading\/","title":{"rendered":"Replacing a worn plasticising screw? Shouldn\u2019t you be upgrading for better productivity!"},"content":{"rendered":"

When you buy a plastic processing machine, the plasticising screw is often supplied with a General Purpose (G.P.) design and nitrided wear resistance. In many cases the OEM won\u2019t have been told you only process particular material grades, and a GP screw provides the biggest processing window across the spectrum of materials.<\/strong><\/p>\n

This design however, will always be a compromise….<\/strong><\/p>\n

Both in terms of wear resistance and process capabilities. As an example, if you\u2019re processing a glass filled material, the serviceable life of a nitrided screw will be greatly reduced.\u00a0 Nitriding produces an extremely hard surface, but only penetrates a few \u2018thou\u2019 into the surface of the steel.\u00a0 Once you wear through this layer, the steel below is relatively soft.<\/p>\n

So when the time comes to replace your original OEM screw, what should you do?<\/p>\n

First \u2018port of call\u2019 will probably be the OEM.\u00a0 They may even have another G.P. screw on the shelf.\u00a0 If however you now process a particular grade or group of materials, you should be considering some other options:<\/p>\n