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Single screws
We can supply a complete range of extrusion screws. Based on our large experience we can recommend the proper type of steel and surface treatment to minimize wear. According to customer’s needs we can propose nitriding steel, stainless steel, tool steel and also sintered steels (CPM/PM).
Screws according to OEM’s specifications
We deliver screws according to OEM’s specification.A screw is the heart of the process and determines the the productivity and the quality of the molded parta. For this reason we can deliver screws with a Maxi Melt design that can help you to optimise your production.
Deliver better surface
Our screws can be delivers with all kind of treatmenst to improve surface conditions and to improve plasticizing. A beter surface finish will improve plasticizing and reduce reject rate. All these improvements are just standard for us, so that we can bind the fulfilment of these objectives to the purchase of the screw.
The advantage of our extrusion screws
Up to date machinery and CAD CAM facilities make it possible to manufacture high quality complex products with tight tolerances from different kind of materials to be selected from case to case with a high surface finish suitable to withstand wear and or corrosion conditions
Materials for plasticizing screws
Choosing the right screw material is important to have the right plasticizing performance in order to reduce wear and corrosion problems
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DIN standard
Material
Type steel
Treatment
Hardness
Abrasion resistance
(x good) to (xxxxx excellent)Corrosion resistance
(x good) to (xxxxx excellent) -
1.850941CrAIMo7Nitriding steelNitrided>850 HV1++
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1.851931CrMoV9Nitriding steelNitrided>700 HV1++
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1.855034CrAINi7Nitriding steelNitrided>850 HV1++
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1.4122X35CrMo17Stainless SteelIonitrided950-1100 HV1++++
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1.2379X155CrVMo121Tool steelHardened59 - 63 HRC+++++
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-KPM1PM materialHardened58 - 63 HRC+++++++
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-KPM2PM materialHardened55 - 60 HRC+++++++++
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Din standard1.8509
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Material41CrAIMo7
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Type steelNitriding steel
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TreatmentNitrided
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Hardness>850 HV1
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Abrasion resistance+
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Corrosion resistance+
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Din standard1.8519
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Material31CrMoV9
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Type steelNitriding steel
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TreatmentNitrided
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Hardness>700 HV1
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Abrasion resistance+
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Corrosion resistance+
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Din standard1.8550
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Material34CrAINi7
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Type steelNitriding steel
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TreatmentNitrided
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Hardness>850 HV1
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Abrasion resistance+
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Corrosion resistance+
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Din standard1.4122
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MaterialX35CrMo17
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Type steelStainless Steel
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TreatmentIonitrided
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Hardness950-1100 HV1
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Abrasion resistance+
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Corrosion resistance+++
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Din standard1.2379
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MaterialX155CrVMo121
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Type steelTool steel
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TreatmentHardened
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Hardness59 - 63 HRC
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Abrasion resistance+++
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Corrosion resistance++
Welding materials for the screw flights
For larger screw sizes we often use nitrided materials with the flighttips welded welded with different materials options. This done to create wear/corrosion protecting or improve friction/lubrication
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Type
Base Alloy
Alloy components
Hardness [HRC]
(a) Hardness of matrix, tungsten carbides have a hardness of 89 HRC.Abrasion resistance
(x good) to (xxxxx excellent)Corrosion resistance
(x good) to (xxxxx excellent) -
Stellite 1CobaltC - Cr - W52 - 57++++++
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Stellite 12CobaltC - Cr - W44 - 48+++++
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Colmonoy 56NickelC - Si - Cr - B - Fe52 - 56+++++++
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Colmonoy 83NickelTungsten carbide56 - 60 [a]+++++++++
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CastoTIG 5IronCr - V58 - 62++++++
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TypeStellite 1
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Base AlloyCobalt
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Alloy componentsC - Cr - W
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Hardness [HRC]52 - 57
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Abrasion resistance+++
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Corrosion resistance+++
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TypeStellite 12
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Base AlloyCobalt
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Alloy componentsC - Cr - W
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Hardness [HRC]44 - 48
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Abrasion resistance++
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Corrosion resistance+++
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TypeColmonoy 56
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Base AlloyNickel
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Alloy componentsC - Si - Cr - B - Fe
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Hardness [HRC]52 - 56
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Abrasion resistance+++
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Corrosion resistance++++
Screw coatings
In most cases these coatings are used to reduce friction, and therefore improve the plasticizing, or protect against corrosion
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Coatings
Thickness of layer [MM]
Hardness
Abrasion resistance
(x good) to (xxxxx excellent)Corrosion resistance
(x good) to (xxxxx excellent) -
Chrome plating0,020 – 0,035800 – 1100 HV 0,1+++++++
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Nickel plating0,015 – 0,025500 – 600 HV 0,1+++++++
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PVD, TiN0,0042500 HV 0,5+++++
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PVD, CrN0,0042100 HV 0,5++++++
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PVD, CrN-multi layer0,0082100 HV 0,5++++++++
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CoatingsChrome plating
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Thickness of layer [MM]0,020 – 0,035
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Hardness800 – 1100 HV 0,1
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Abrasion resistance++++
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Corrosion resistance+++
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CoatingsNickel plating
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Thickness of layer [MM]0,015 – 0,025
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Hardness500 – 600 HV 0,1
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Abrasion resistance++
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Corrosion resistance+++++
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CoatingsPVD, TiN
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Thickness of layer [MM]0,004
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Hardness2500 HV 0,5
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Abrasion resistance+++
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Corrosion resistance++
Example screws
Based on all material and treatment options we selected some examples screw configuration versus polymer processing.
Extrusion 3 Zone screw with mixer for processing PP profiles
Extrusion screw 1
Contact us-
Alloy1,8509
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Alloy componentsCr - AI
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Hardness [HRC]950-1100 Hv (65-67 HRC)
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Size [mm]Ø 60
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Abrasion resistance+
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Corrosion resistance+
Extrusion screw with 2 mixers for processing LLDPE with masterbatch. Blowfilmapplication.
Extrusion screw 2
Contact us-
Alloy1,8550
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Alloy componentsCr - AI
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Hardness [HRC]950-1100 Hv (65-67 HRC)
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Size [mm]Ø 75
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Abrasion resistance+
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Corrosion resistance+
Extrusion screw for processing rubber.
Extrusion screw 3
Contact us-
Alloy1,8509
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Alloy componentsCr - AI
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Hardness [HRC]950-1100 Hv (65-67 HRC)
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Size [mm]Ø 60
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Abrasion resistance+
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Corrosion resistance+
Discover more products
Other products for injection and extrusion can be found below by clicking on the pictures more information is shown.
