PML
Magnetic Chute
Magnetic Chute
Starting from Rs.41,610
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Product Details
At a Glance
A magnetic chute (also known as a channel magnet or spout magnet) fits directly into a duct or discharge line to trap ferrous contamination from sticky, non-free-flowing material that won't pass cleanly through a grill. PML's magnetic chutes are rated up to 11,000 Gauss for continuous operation up to 350°C, with hinged doors for manual cleaning.
Sticky, non-free-flowing material doesn't pass cleanly through a grill or a filter — it needs a design built for flow, not a fixed rod bed. The PML Magnetic Chute — also known as a channel magnet or spout magnet — fits directly into a duct or discharge line, trapping iron particles from dry, granular or powdered material as it moves through, in either a door-mounted plate configuration or a central bullet magnet design.
Two Configurations
- Door Type
Magnets are mounted on hinged doors on the sides of the chute — swing the door open for manual cleaning of arrested iron particles.
- Bullet Type
A conical magnet sits fixed at the centre of the chute, with guided strips directing material onto the bullet's face for maximum contact with the flow.
Chutes are typically placed vertically on discharge ducts, though horizontal installation between material flow lines is possible where the application calls for it (this may require added suction).
Standard Range
| Model | A (mm) | B (mm) | C (mm) |
| CB001 | 120 | 350 | 220 |
| CB002 | 150 | 350 | 250 |
| CB003 | 200 | 478 | 300 |
| CB004 | 250 | 478 | 350 |
Key Advantages
- Built for Sticky Material
Where grills would clog, the chute's open flow path keeps sticky or non-free-flowing material moving.
- Down to 10 Microns
High-intensity rare-earth versions capture ferrous particles as fine as 10 microns.
- Simple Manual Cleaning
Hinged access lets you clear captured iron without dismantling the chute.
- High-Temperature Option
Bullet rod-type chutes with Samarium Cobalt (SmCo) magnets run up to 350°C.
Where It's Used
Plastics, food, spices, chemicals, and dyes and powder pigments — wherever the material flowing through the duct is sticky or otherwise unsuited to a rod-bed grill.
What We Need for a Custom Chute Quote
- Size of the duct and the flange the chute needs to fit
- Type of material and particle size
- Size and concentration of expected contamination
- Flow rate
Frequently Asked Questions
Door type or bullet type — which is right for me?
Door type suits lower-flow lines where side-mounted plates give enough contact; bullet type centres the magnet directly in the flow for higher-throughput or heavier contamination lines.
Can it be installed horizontally?
Yes, though vertical installation on the discharge duct is standard. Horizontal runs may need added suction — tell us your layout and we'll advise.
What's the finest particle it captures?
High-intensity rare-earth versions trap ferrous particles down to 10 microns.
What temperature can the chute handle?
Standard units run at normal process temperatures; bullet rod-type chutes with Samarium Cobalt (SmCo) magnets are rated up to 350°C for hot lines.
What Gauss rating does it reach?
Up to 11,000 Gauss in bullet rod configuration, with a 9,000 Gauss / 350°C high-temperature option.
Why Buy From PML
- 65+ years of magnetic separation engineering — trusted by Hindustan Unilever, Cipla, Tata Tea and Pidilite Industries, among others.
- Made and tested in-house — every chute is manufactured and checked to its stated Gauss rating.
- Up to 11,000 Gauss in bullet rod configuration, with a 9,000 Gauss / 350°C option for hot lines.
- Magnetic calibration and audit services available to verify field strength over time.
Need a custom size or configuration? Enquire now and our engineering team will size the right chute for your duct.
Why Magnetic Strength Drops in Ferrous Separators (and When to Replace)
Separation efficiency falls as magnetic strength decreases. Below are the most common causes of reduced field strength in NdFeB (neodymium) magnetic separation equipment, along with the warning signs that indicate a magnet or separator needs replacing.
Causes of Reduced Magnetic Strength
- Thermal demagnetization: Standard Neodymium-Iron-Boron (NdFeB) grades lose magnetic strength when exposed to temperatures above their rating — often starting at 80°C / 176°F for standard grades. Exceeding these limits causes a permanent loss of magnetic flux.
- Corrosion and core oxidation: NdFeB is highly iron-rich and oxidizes quickly. If moisture, washdown liquids, or corrosive chemicals breach the outer stainless steel cladding, the magnet swells, crumbles, and loses field strength.
- Mechanical damage and internal cracking: NdFeB is brittle. Dropping magnetic tubes during cleaning, or subjecting them to heavy equipment vibration, causes internal micro-fractures that break the continuous magnetic circuit.
- Strong opposing magnetic fields: A sufficiently strong opposing field can overcome a material's coercivity and flip or randomize its magnetic domain polarity. High alternating current (AC) electric fields, in particular, create powerful local alternating magnetic fields that rapidly scramble domain alignment.
- Material buildup ("air gap" effect): Accumulated fine iron on the surface acts as a barrier, pushing the active magnetic field further away from incoming material. Because magnetic force decays exponentially with distance, even a few millimetres of buildup severely reduces capture rates.
- Increased process velocity or burden depth: Running material too fast, or in overly thick layers, prevents fine ferrous particles from spending enough time in the peak magnetic field zone to be pulled out of the flow.
Signs an NdFeB Magnet or Separator Needs Replacing
- Drop in gauss rating: Annual or semi-annual gauss testing shows a permanent drop of 10–15% or more from the baseline specification.
- Bulging or "pillow" swelling: The protective stainless steel tube cladding looks warped, swollen, or cracked — a sign of internal oxidation where rust has expanded inside the shell.
- Dead spots along the field: Measuring with a gauss meter reveals localised spots with zero or drastically lower magnetic pull across the grid or tube surface.
- Downstream metal contamination: Ferrous fines or tramp iron start showing up in final product testing or downstream machinery detectors despite the separator being clean.
- Structural casing punctures: Scratches, gouges, or pinhole leaks in the stainless steel jacket expose the internal magnetic circuit to moisture and process fluids.
Regular gauss testing (at least annually) is the most reliable way to catch strength loss before it affects downstream product purity — PML's own range of Gaussmeters and magnetic field meters covers this. If you're seeing any of the signs above, talk to our team about testing or replacing your separator.
