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Plastics & Polymer Processing Application
Magnets for Injection Moulding Machines Supplier in Pakistan
High-intensity neodymium hopper magnets and drawer grids engineered to protect injection screws, barrels, and hot-runner moulds across Pakistan.
Industry Challenges & Engineering Requirements
When a piece of metal enters an injection moulding machine hopper, it travels directly into the heated barrel. A stray screw or steel shaving will score the precision-machined screw and barrel lining, clog injection nozzles, and damage expensive multi-cavity injection moulds. Repairing or replacing an injection screw costs hundreds of thousands of rupees and causes days of costly factory downtime.
Recommended Magnetic Solutions & Assemblies
Specialized magnetic equipment configurations engineered for magnets for injection moulding machines:
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Hopper Grate Magnets (Round & Square)
Stainless steel grid assemblies consisting of multiple parallel magnetic tubes (typically 8,000 to 12,000 Gauss) arranged with diverter bars that fit inside the machine hopper cone, capturing metal as plastic pellets cascade through.
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Easy-Clean Drawer Magnet Housings
Enclosed multi-tier drawer assemblies fitted between the drying hopper and the machine throat, featuring slide-out magnetic tubes with external stainless steel wipe-sleeves that instantly release trapped metal.
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High-Temperature Neodymium Hopper Grates
Specialized high-heat neodymium magnetic tubes rated up to 120°C to 150°C, designed to sit beneath desiccant hopper dryers where hot plastic pellets would demagnetize standard magnets.
Crucial Technical & Engineering Considerations
Key variables to evaluate before purchasing or installing magnets in this application:
- • Pellet flow and bridging prevention: Grate tubes must be spaced far enough apart to allow smooth gravity flow of virgin pellets and irregularly shaped regrind flakes without causing material bridging or hopper clogs.
- • Thermal operating conditions: Heated hoppers and hopper dryers routinely reach 80°C to 120°C for engineering resins (such as PET, Nylon, and ABS). Standard N35 magnets will lose magnetic strength at these temperatures; high-temperature NdFeB (SH or UH grades) or ceramic ferrite must be specified.
- • Surface gauss intensity: While large bolts are easily caught by moderate magnetic fields, capturing fine wear dust and microscopic wire strands requires high-gradient magnetic tubes with surface field strengths exceeding 10,000 Gauss.
- • Diverter baffles: Angle-iron deflector bars positioned above the magnetic tubes deflect falling plastic pellets directly across the magnetic tube surfaces, preventing metal from slipping through gaps.
Installation, Mounting & Maintenance Protocols
1
Place the hopper magnet assembly at the lowest point of the feed hopper directly above the feed throat opening.
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Clean the magnetic tubes daily or at every raw material batch change to prevent accumulated metal from dropping into the barrel.
3
For easy-clean sleeve models, slide the internal magnetic cores out of their external stainless steel tubes over a collection tray; all trapped metal drops off cleanly.
Selection & Sizing Matrix for Pakistani Operations
Standard small moulding machines (50 - 150 Ton): 150mm to 200mm round or square hopper grates
Medium to large machines (200 - 650 Ton): 250mm to 350mm multi-tier drawer magnet housings
Heavy blow moulding & extrusion lines: Heavy-duty drawer assemblies with easy-clean wipe sleeves
Magnets for Injection Moulding Machines FAQs
Common questions answered by our engineering and supply team
Can standard room-temperature neodymium magnets be used inside a heated hopper dryer?
No. Standard neodymium magnets suffer permanent thermal loss above 80°C. If your hopper dryer runs at 90°C to 130°C, you must use high-temperature rated neodymium (M, H, or SH grade) or ceramic ferrite grates.
How do hopper magnets handle recycled plastic regrind?
Our hopper grates feature integrated diverter bars that break up clumps and guide plastic flakes directly across high-intensity magnetic tubes, capturing tramp iron, cutter blade chips, and wire fragments.
Do you supply hopper magnets for plastic factories in Lahore, Gujranwala, and Karachi?
Yes, Faisal Magnets supplies plastic processors across Lahore (Kot Lakhpat, Sundar Industrial Estate), Gujranwala, Karachi (Korangi, SITE), and throughout Pakistan.
Compatible Magnet Products for Magnets for Injection Moulding Machines
In stock for swift delivery to factories and workshops across Pakistan
Wholesale & Retail
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Wholesale & Retail
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