products details
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KB 45° Kneading Blocks For Twin Screw Extruders KB 45/5/30 R/L 45/5/40 R/L
| Brand Name: | OEM |
| Model Number: | KB010 |
| MOQ: | Negotiable |
| Price: | Negotiable |
| Payment Terms: | T/T,Negotiable |
| Supply Ability: | 8000pcs/month |
45/5/40 R/L kneading blocks
,KB 45/5/30 R/L kneading blocks
,45/5/40 R/L twin screw elements
KB 45° Kneading Blocks for Twin Screw Extruders | KB 45/5/30 R/L & 45/5/40 R/L
The KB 45° Kneading Block (45/5/30 R/L & 45/5/40 R/L) drives the melting and mixing process in co-rotating twin screw extruders. The 45° stagger angle strikes a perfect balance between strong shear and steady material push.
We offer two standard lengths (30 mm and 40 mm) with two flow options:
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Forward Elements (R): Push material forward and melt solid resin smoothly.
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Reverse Elements (L): Block material flow to build high pressure. This holds material in the mixing zone longer for complete melting.
We machine every block on CNC 5-axis equipment using top-grade tool steel. You get high accuracy, long wear life, and strong corrosion resistance.
| Parameter | Specification |
|---|---|
| Models | KB 45/5/30 R, KB 45/5/30 L, KB 45/5/40 R, KB 45/5/40 L |
| Stagger Angle | 45° (Balanced shear and conveyance) |
| Discs | 5 Discs |
| Length | 30 mm / 40 mm |
| Screw Diameters | Φ35 mm, Φ40 mm, Φ43 mm, Φ50 mm, Φ58 mm, and custom sizes |
| Base Materials | High-speed steel M2, Powder steel CPM 10V / WR5, Corrosion steel WR13 |
| Hardness | HRC 60 - 65 |
| Spline Standards | DIN 5480 / Hexagonal / Keyway |
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Balanced Performance: The 45° angle balances pushing power and mixing shear.
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High-Frequency Cutting: The 5-disc setup cuts material 5 times in a short length. It breaks down powder clusters fast.
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Strong Pressure Seal: The reverse blocks (L) build high pressure to prevent unmelted resin from passing through.
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Top Wear Materials: We use CPM 10V powder steel to boost wear life by 3 to 5 times in glass-fiber compounding.
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Exact Machine Match: We build elements to strict tolerances. They match standard industry shafts directly.
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Engineering Plastics: PA6, PA66, PET, PBT, and PC glass-fiber compounding.
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Masterbatch Lines: Color, carbon black, and additive masterbatch mixing.
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High-Fill Polymers: PP/PE with up to 70% calcium carbonate or talc filler.
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Flame Retardants: Mild melting for heat-sensitive HFFR materials.
| Model | Stagger | Discs | Length | Flow Direction | Primary Function |
|---|---|---|---|---|---|
| KB 45/5/30 R | 45° | 5 | 30 mm | Forward (R) | Fits tight spaces. Delivers gentle melting and initial mixing. |
| KB 45/5/40 R | 45° | 5 | 40 mm | Forward (R) | The main melting element. Delivers continuous shear for full plasticization. |
| KB 45/5/30 L | 45° | 5 | 30 mm | Reverse (L) | Short barrier. Builds medium back-pressure at the end of a mixing zone. |
| KB 45/5/40 L | 45° | 5 | 40 mm | Reverse (L) | Heavy barrier. Builds strong pressure seal to stop unmelted solids. |
A: Pair them in sequence: [ KB 45/5/40 R ] + [ KB 45/5/30 L or KB 45/5/40 L ]. The forward block pushes material ahead. The reverse block pushes back. This forces material into the disc gaps and creates high pressure for total melting.
A: Base your choice on your screw length:
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40 mm Blocks: Provide longer continuous shear. They serve as the standard choice for main melting zones on mid-to-large production lines.
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30 mm Blocks: Give you layout flexibility. Use them in tight mixing zones or right after side feeders.
A: Choose CPM 10V or WR5 powder steel. Glass fibers wear down standard steel quickly. CPM 10V lasts 3 times longer than standard M2 steel and reduces your downtime.
Need Reliable Screw Elements for Your Line?Get factory-direct kneading blocks that fit your machines perfectly.
We supply standard KB 45/5/30 R/L and KB 45/5/40 R/L elements. We also make custom splines and special wear alloys.
📩 Request a Quote: Send us your shaft diameter and processing material. Our engineering team will send you CAD drawings and a price quote within 24 hours!
