Practically Measuring Magnetic Separator Strength

Technically Assessing Magnetic Separator Power

A Magnetic Separator is designed to attract, capture and hold magnetic particles.  The magnetic strength needed to successfully achieve that design objective is commonly stated in a magnetic separator supplier’s quotation or specified in the tender.  This ‘Magnetic Strength’ is usually referenced in terms of ‘gauss’, a unit of measurement.  However, the ‘gauss’ value can be very difficult to accurately measure.

20180424_173613
Fine iron contamination captured on Tube Magnets

There is a more practical method of assessing the magnetic strength.  This removes any ambiguity whilst providing simple, repeatable, and comparable data to assess most Magnetic Separators.

Measuring Magnetic Strength

The magnetic strength of a Magnetic Separator is often referenced in terms of ‘gauss’.  Gauss (symbolized G) is the centimetre-gram-second (cgs) unit of magnetic flux density. A flux density of 1 G represents one maxwell per centimetre squared (1 Mx ­ cm -2 ).  It is named after the German scientist Carl Friedrich Gauss.

Gauss can be measured using a Gaussmeter.  However, it is important to note that the Gauss rating on its own does not fully indicate the strength of a magnet.  Additionally, gaussmeters can give a range of readings dependent upon the orientation of the probe and several other variable parameters.

Proposals for Tube Magnets often include details of length, diameter and the gauss reading.  With the gauss reading being so difficult to test and prove, purchasers and users are unable to check that the Tube Magnets supplied actually meet the specification of the quote and the order.

However, in terms of Magnetic Separation the objective for the user is simple; the magnetic force must enable the attraction and capture of any magnetically susceptible metal.  That ability can be measured as a function of the effort needed to remove a specific steel item from the surface.

The Method

Measuring the effort needed to remove a steel item from the face or surface of a Magnetic Separator is achieved using a spring balance and is commonly called a ‘Pull Test’.  The magnetic test piece (e.g. a 6mm ball bearing welded onto a non-magnetic attachment ring) is clipped onto the end of the spring balance.

Bunting Magnetics Pull Test Kit
A Pull Test Kit ‘Spring Balance’

The magnetic test piece is placed on the surface of the Magnetic Separator and force applied at the other end of the spring balance until it is detached.  The force required to remove the magnetic test piece (measured in kgs) is recorded on the measurement scale of the spring balance.

Measurements are taken in the centre of the Tube Magnet and on the end poles.  They are repeated three times and the average recorded as the force required to remove the magnetic test piece at each point.

The following video explains the Pull Test technique.

This simple but effective method does not record or provide any indication of the gauss, but accurately provides data that can be used to compare the condition of a Magnetic Separator over time and compare the performance with other similar designs.

Pull Test Experiments

Magnetic Separator designs vary considerably depending on the application.  The Pull Test technique is suitable for measuring the magnetic strength of smaller Magnetic Separators such as Tube or Cartridge Magnets and Plate Magnets.

Tube or Cartridge Magnets are often used stand alone or as part of a Magnetic Separator configuration (e.g. Drawer Filter or Liquid Trap).

Bunting Magnetics Pull Test Kit
Magnetic Test Piece

A small steel ball is used as the magnetic test piece when measuring the magnetic strength of a Tube or Cartridge Magnet (the photograph shows a 6mm diameter ball)

The metal test piece is attached to the end of the Spring Balance and then placed into the magnetic field, being attracted to the magnetic pole.

Bunting Magnetics Pull Test Kit
Magnetically Attracted Metal Test Piece

In a series of experiments, we used the Pull Test technique to assess the magnetic strength of Tube Magnets with Ceramic (Ferrite), Standard Neodymium Rare Earth, and High Strength Neodymium Rare Earth Magnets.

The tests were undertaken using three different sizes of steel ball in the magnetic test piece (6mm, 12mm and 25mm) and introduced non-magnetic spacer to assess the magnetic strength at specific distances away from the surface (3mm and 6mm).  All the recorded measurements are in kilograms (kg)

Ceramic (Ferrite)

Gap 6mm Ball 12mm Ball 25mm Ball
None 1.25 1.75 2.5
3mm NR NR 1.2
6mm NR NR NR

Graph - Ceramic Tube Magnet

Note:  all measurements are recorded in kilogrammes.

Standard Neodymium Rare Earth

Gap 6mm Ball 12mm Ball 25mm Ball
None 2 4.25 9
3mm 1.2 1.6 2.45
6mm NR 1.25 1.5

Graph - Std Neo Tube Magnet

Note:  all measurements are recorded in kilogrammes.

High Strength Neodymium Rare Earth

Gap 6mm Ball 12mm Ball 25mm Ball
None 3.75 9 14.5
3mm 1.5 2.5 4.6
6mm 1.1 1.5 2.25

Graph - High Strength Neo Tube Magnet

Note:  all measurements are recorded in kilogrammes.

In all cases, the drop off in magnetic strength as you move away from the surface of the Tube Magnet is significant and this highlights the need for metal contamination to come into contact with the surface.  Arrangements where the Tube Magnets are configured as a Grate (i.e. are lined up and equally spaced) commonly have a deflector above the gap between the Tubes that directs material in the area of maximum magnetic strength.

Comparison

The tests highlight the difference in magnetic strength on the surface, with high strength Rare Earth magnets producing nearly 3 times as much pull as Ceramic magnets.

Findings During Magnetic Separator Audits

Magnetic Separator Audits often highlight issues that had previously gone undetected.  The first check focuses on the physical integrity of the Magnetic Separator, inspecting welds, and assessing wear and damage.  Once these have been completed, the measurements are taken.

The most common findings when undertaking magnetic separator audits are:

Weld Failure

20180424_161133
Consequence of weld failure on a Liquid Magnetic Filter

Magnetic Liquid Filters, fitted into pipelines, have Tube Magnets that are welded to a lid and project down into the product flow.  Metal is attracted and captured on the surface of the Tube Magnet.

In cases where the welds have failed (e.g. poor manufacture, eaten away by acidic or alkaline liquids), liquid will seep into the tube and onto the magnets.  The magnets then swell and lose magnetic strength, ultimately splitting the outer stainless-steel casing.

Tube Magnet Wear

When material falls directly onto the surface of a Tube Magnet, over time the surface can be worn.  Wear usually occurs on the poles where magnetic particles have been captured.  Once the outer stainless-steel casing has been breached, the Tube Magnet should be replaced.

Weak Tube Magnets

Magnetic separation audits highlight the variance in magnetic strength of Tube Magnets.  Often, the Tube Magnets have been installed for some time and details of the original specification have been lost.  When testing the magnetic strength, some Tube Magnets are found to have very poor strength and provide little if no metal separation protection.  This is of great concern when the Tube Magnet is positioned to protect a particular item of processing plant where metal contamination damage could result in production downtime and costly repairs.

Conclusion

The Pull Test Experiments highlights the importance of physically checking the real magnetic strength of a Tube Magnet and not only replying on the stated gauss.  Including details of the force needed to detach a 6mm steel ball from the surface of the Tube Magnet in the request for quotation and the order, protects the user and ensures that the supplied equipment is as exactly as stated.

This ‘Pull Test’ measurement technique also enables a regular comparative test that will immediately highlight any drop in magnetic strength.  This can be used in annual audits or inspections as part of a plant’s quality management system.  A change in ‘pull’ strength may be the result of physical (e.g. failed weld, broken magnets from being dropped) or excessive heat.  The reduced magnetic force may result in the magnetic separator no longer being fit for purpose.

For further information on measuring the strength of a Magnetic Separator, please visit our website or contact us on:

Phone: +44 (0) 1442 875081
Email: press@buntingeurope.com
Via the website

Photographs taken and videos produced by Paul Fears Photography

A Rejuvenated RWM Exhibition

Busy Stand for Bunting Magnetics at RWM

At this year’s rejuvenated RWM Exhibition (NEC, Birmingham, 12th – 13th September), the Bunting Magnetics and Master Magnets stand proved to be a great success.  Being positioned in a prime stand in front of the entrance, and with working metal separators on the stand, visitors were drawn to see the latest developments in magnetic separation technology.

RWM 2018 Exhibition
Stainless Steel Magnetic Separator in action

In January 2018, Prysm Group announced that they had taken on the flagging RWM exhibition.  Attendance of the RWM exhibition in 2017 had been poor and many exhibitors had lost faith with the event.

At an event in the Google headquarters in London, RWM exhibition manager Nick Woore announced their intention to inject new life into the show.  The plans sounded positive, although there was still a great deal of doubt from many exhibitors.  In fact, in 2018 the number of exhibitors were lower than in 2017, but visitors numbers were higher.

“It was great to see people queuing outside the entrance on the first morning of the exhibition,” said Dave Hills, Bunting’s Head of Sales.  “As soon as the doors opened, our stand was full of visitors.”

Bunting had two operating production-sized metal separators on the stand:

Dave Hills also gave two presentations on ‘Stainless Steel Separation in Modern Day Recycling’.

RWM 2018 Exhibition

“Being able to show visitors the separation capabilities of the equipment was vitally important,” explained Hills.  “This made it easier to relate to their metal separation requirements.  Following the exhibition we will be conducting tests at our Master Magnets Redditch laboratory, where we can confirm the separation capabilities.  It is going to be a busy few months.”

Hills also explained the importance of a successful RWM.  “Recycling and good waste management is no longer an option but a necessity and it is essential that there is a UK based trade event.  We are looking forward to hearing how the organisers plan to further develop RWM for 2019.”

More photographs from the RWM exhibition can be seen on our Flickr photograph album.

For further information metal separation equipment designed for removing metal from plastic waste and in other recycling applications, please visit our website or contact us on:

Phone: +44 (0) 1442 875081
Email: press@buntingeurope.com
Via the website

Photographs taken by Paul Fears Photography

Other Plastic Waste & Recycling Articles

RWM 2018 Exhibition

 

3 Facts About Plastic Packaging Waste

Latest 2016 Waste Recycling DEFRA Data

The UK’s largest recycling exhibition, RWM, takes place on the 12th and 13th September 2018 (NEC, Birmingham, UK).  Leading up to the show, we wanted to review three key facts relating to the latest DEFRA data (from 2016) on plastic packaging waste (published in February 2018).

Waste Drinks Containers-9048

The Amount of Plastic Packaging Waste

UK households generated 1,015,000 tonnes of plastic packaging waste in 2016.  This is actually 12% lower than in 2012, although the amount has been relatively stagnant since 2103.  In 2016, 20% of all packaging waste was plastic (by weight), although this percentage would be far higher if measured by volume due to the low bulk density of the material.

A Rising Recycling Rate

45% of plastic packaging was recycled or recovered in 2016 compared with 25% in 2012.  The 2016 figure is higher than the EU target of 22.5%.  Since the beginning of 2018, the UK Government has set a new recycling and recoverable target of 57% by 2020.  This means that new strategies are needed to raise the rate by 12% in just four years.

Plastic Packaging Recycling Rates

However, there remains a question about what to do with the plastic once it has been recovered.  The UK still exports a large proportion of its waste, but this is still classed as being ‘recovered’ and is included in the 45%.  Since China closed their doors to waste, plastic waste has being shipped to countries around the world, including Malaysia, Thailand and Vietnam.  This is not a sustainable solution, but it not reported in the statistics.  An increasing amount of plastic waste is expected to remain in the UK and it is unclear how it will be managed.

Plastics Recycling Plants

It is widely accepted that there are not enough plastic recycling plants in the UK.  In the past, it has been difficult to economically operate a plant with high costs associated with equipment investment and site difficulties due to the flammable nature of plastic waste.

Bunting Magnetics Drawer Magnets at Ecovyn
FF Drawer Filter Magnets (supplied by Bunting Magnetics Europe Ltd) removing metal from plastic waste to enable recycling

One successful plant is located near Wrexham in North Wales where EcoVyn process 1,000 tonnes per month of good quality plastic waste.  EcoVyn installed several Drawer Filter Magnets to remove ferrous metal contamination from the granulated plastic.

The Future

There has been a huge change in the public perception of plastic waste since the showing of the BBC series Blue Planet II in 2017.  This has forced politicians to start taking action and it will be interesting to see the level of political and governmental engagement at the RWM exhibition.

For further information on metal separation equipment designed for removing metal from plastic waste and in other recycling applications, please visit our website or contact us on:

Phone: +44 (0) 1442 875081
Email: press@buntingeurope.com
Via the website

Other Plastic Waste & Recycling Articles

Metal Contaminated Sugar Alert

Latest Metal Contamination Food Safety Alert

On the 28th July 2018, the UK Food Standards Agency released a food alert announcing ‘Tereos UK recalls Granulated Sugar due to the presence of small metal pieces‘.  This is the third report of metal being found in food reaching the consumer in 2018 after six metal contamination alerts in 2017.

Metal In Sugar

Metal enters the food manufacturing process via many different avenues.  Metal can be present in ingredients being delivered to a food processing plant and unless removed at source can enter the process and cause significant damage.  Equipment failure and wear can also lead to metal contamination and is usually removed with the right combination of magnetic separators and metal detectors.

The source of the metal contamination in the granulated sugar is presently unknown and an investigation is most likely underway.  The sugar is sold in the UK by the retailers Iceland, Poundland, and Sainsbury’s and has been recalled.  The metal contamination will be costly in terms of direct financial cost and reputation.

Getting Metal Out of Sugar

Removing metal contamination from granulated sugar is commonly achieved using Drawer Filter Magnets and Plate Magnets.  Plate Magnets are installed in chutes where the sugar flows over the surface.  Due to the small size of the sugar granules Neodymium Rare Earth Plate Magnets are preferable, producing the highest magnetic attractive force to remove small ferrous and magnetically-susceptible work-hardened stainless steel.

SC FF drawer - no tr#14B20B

Due to the potential sticky nature of the sugar, sleeved Drawer Filter Magnets are often preferred, in an easy-clean design.  The Rare Earth Tube Magnet sits tightly inside a fixed stainless steel outer tube.  Cleaning forms part of a daily maintenance schedule, with the Tube Magnets being withdrawn from the sleeves to drag and deposit metal contamination in a discharge chute.

Magnetic Separation Audits

Bunting engineers conduct regular Magnetic Separation Audits at many food manufacturing plants.  An audit involves the visual and physical inspection of every magnetic separator in a plant to check on the location, suitability integrity (ie checking welds and for wear), and magnetic strength (which can deteriorate with excessive heat, weld damage, or if dropped).  In April three Magnetic Audits were conducted and highlighted a number of issues that have since been addressed.

For more information on preventing Metal Contamination Food Safety Scares, or to arrange a free onsite survey and audit of a particular plant or process, please contact the Bunting team on:

Phone:  +44 (0) 1442 875081

Email:  sales@buntingeurope.com

Via the website

Other Food Safety Articles

 

RWM Becomes Metal Separation Test Centre

Interactive Stand 5Q11 at RWM

Visitor interaction is the theme of the Bunting stand at this year’s RWM (12-13 September, 2018, NEC, Birmingham, UK).  With their stand (5Q11) in prime-position opposite the entrance to the show, Bunting will invite visitors to take a lump of non-ferrous metal or stainless steel, place it on the belt of the metal separator, and witness separation.

Bunting Magnetics Europe at RWM16
The separation of stainless steel on a magnetic separator

“We wanted to do something different this year,” explained Dave Hills, Bunting’s Head of Sales.  “Visitor interaction is so important and we want people to handle the metal and then see what happens when they place it on the belt of the metal separation system.”

Operating on the stand at RWM will be a production-sized Eddy Current Separator and Stainless Steel Magnetic Separator, and demonstration-sized model of the popular Permanent Overband Magnet.

On the Stainless Steel Magnetic Separator, visitors will be able to separate several different materials.  These include large lumps of fragmented stainless steel, from secondary metal recycling plants, and printed circuit boards (PCBs) from electronic recycling operations.

The Stainless Steel Magnetic Separator uses a patented high strength magnetic roll that generates enough attractive power to separate even the weakest magnetic materials.  When passing through a shredder, the edges of stainless steel become weakly magnetic and this enables the effective separation.  Also, PCBs have small components that are weakly magnetic and these are attracted by the strong magnetic field and separated from non-magnetic materials.

Dave Hills will be speaking about the Stainless Steel Magnetic Separator in the Alternative Fuels Theatre on Wednesday 12th (12:30-13:00) and Thursday 13th (11:45-12:15).

Eddy Current Separators are a common feature at the RWM exhibition.  The Master Magnets design focuses on maximising non-ferrous metal separation whilst maintaining product purity levels.  The ability to produce the optimum separation of non-ferrous metals is dictated by the design of the high speed rotating magnetic rotor and visitors will be able to place non-ferrous metals on the separator and witness the dramatic and violent separation.

Bunting Master Magnets at RWM17
Non ferrous metals being separated on the Eddy Current Separator

As the Permanent Overband Magnet is one of the most commonly used magnetic separators in the recycling and waste industry, it was important to have a model on show.  Hundreds of Permanent Overband Magnets are built at the Redditch manufacturing facility each year and they can be seen on many pre-sorted refuse operations recovering steel cans and mobile plant such as crushers and screens.

“Participating in a demonstration is different to simply watching,” explained Hills.  “Visitors to the stand can choose the item they want to separate and then see what happens on the metal separator.”

For further information metal separation equipment designed for removing metal from plastic waste and in other recycling applications, please visit our website or contact us on:

Phone: +44 (0) 1442 875081
Email: press@buntingeurope.com
Via the website

Photographs taken by Paul Fears Photography

Other Plastic Waste & Recycling Articles

Defining Plastics Recyclability

Global Definition of Recyclable Plastic Packaging and Products Released

The global outcry of hostility against plastic products has been gathering momentum since the end of 2017 and, subsequently, politicians and governments have pledged to introduce measures to reduce plastic waste.   However, many of these new policies have been deemed to be popularist and lacking in substance.

plastic-bottles

Many governments, including the European Union, have set recycling targets that have been questioned by the recycling and plastics industries.  The EU has made a pledge to have all plastic packaging recyclable or reusable by 2030, a far more aggressive strategy that the UK Government’s plan for plastic waste reduction.

However, until recently, there has not been a definition to govern the use of the term “recyclable” and so how could any of those targets be quantified?  Due to the public outrage about how plastic waste is damaging our planet, politicians have wanted to be seen to take urgent action, but maybe a more considered approach is needed.  Should the first step be to engage with:

  • Plastic product designers and producers;
  • Companies who will ultimately recycle the products;
  • Businesses that will use the recycled plastic products in the manufacture of new products.

One issue that has often plagued the waste sector is the defining the terminology.  Even the classification of “Waste” differs from country to country.

However, two leading global international plastics recycling organisations have worked together to define the term “recyclable” in terms of plastic products and packaging.  In July 2018, Brussels-based Plastic Recyclers Europe (PRE) and the Association of Plastic Recyclers in Washington, USA have concluded that there are four conditions that define a plastic product as being “recyclable”.  These are:

  1. The product must be made with a plastic that is collected for recycling, has market value and/or is supported by a legislatively mandated program;
  2. The product must be sorted and aggregated into defined streams for recycling processes;
  3. The product can be processed and reclaimed/recycled with commercial recycling processes;
  4. The recycled plastic becomes a raw material that is used in the production of new products;

Technology already exists to help with the sorting of plastic waste into defined streams.  Additionally, there is processing equipment available to remove contamination such as metal (Magnetic Separators, Eddy Current Separators, Metal Detectors) and other contaminants (Optical, X-Ray, Infra-Red).

A recent case history report highlighted how EcoVyn, a PVC compounder in the UK, already processes 1000 tonnes of plastic waste each month of which 80% is post-consumer.

Bunting Magnetics Drawer Magnets at Ecovyn

Such clarity of the definition of whether a plastic product is really “recyclable” can only be beneficial, assisting product designers, users and recyclers.  However, it remains unclear whether the EU, UK and other governments will use this new definition when setting their recycling and plastic waste targets.

For further information on metal separation equipment designed for removing metal from plastic waste and in other recycling applications, please visit our website or contact us on:

Phone: +44 (0) 1442 875081
Email: press@buntingeurope.com
Via the website

Other Plastic Waste & Recycling Articles

EcoVyn Reduce Waste by 94% with Bunting Drawer Magnets

Magnetic Separators Remove Contamination from Plastic Waste

EcoVyn Ltd has installed two Bunting Drawer Filter Magnets to remove ferrous metal contamination from plastic waste.  Since the installation of the magnetic separators, EcoVyn has reduced their waste by 94%.

Bunting Magnetics Drawer Magnets at Ecovyn
Bunting Drawer Filter in situ at EcoVyn

EcoVyn Ltd is at the forefront of PVC compounding and brings pioneering new technology to the market place.  They offer one of the most advanced and innovative production processes in the UK producing reprocessed, blended and virgin compounds for a variety of applications.

EcoVyn first met Bunting at the Interplas international plastics exhibition in September 2017.  The company use a high proportion of plastic waste, of which 80% is post-consumer.  Presently, EcoVyn processes 1000 tonnes per month of good quality reclaimed plastic waste, which they plan to increase to 16,000 tonnes per annum.  The cleansed plastic waste is blended into virgin material, resulting in a 90% output of grade A product.  Waste generated during the manufacturing process is also recycled leaving less than 1% being discarded.

Bunting Magnetics Drawer Magnets at Ecovyn
Granulated plastic waste

However, plastic waste is often highly contaminated with metal.  Metal Detectors were already installed to remove the metal contamination, but the reject rate was very high with over 60 tonnes of waste being generated, of which a high proportion was good quality plastic.

At Interplas, EcoVyn explained the problem to the Bunting team who agreed to conduct a site review.  During the review it was concluded that easily removable magnetically-susceptible metal could be removed, leaving the metal detectors to detect and separate non-ferrous metals.  This would then significantly reduce the number of metal detector rejections and, therefore, the amount of waste generated.

After a review of the process, Drawer Filter Magnets were recommended to be installed between the screw conveyor transporting the 8-10mm sized infeed material and the metal detector.  The metal-cleansed material would then pass onto a pulveriser before continuing through the process.

The Bunting Drawer Filter Magnet is used widely in the plastics industry and enables the simple and effective removal of ferrous metal from free-flowing materials.  The Drawer Filters installed at EcoVyn have two rows of high strength Rare Earth Neodymium Magnets.  The top row has two Tube Magnets with three in the second row aligned to sit below the gap in the top row.  This ensures that all the product strikes at least one of the Tube Magnets, where ferrous metal is attracted by the strong magnetic field and captured.

Bunting Magnetics Drawer Magnets at Ecovyn
Ferrous metal captured on the surface of the Tube Magnets

After the installation of Drawer Filter Magnets, the amount of waste was reduced from 60 tonnes to 4 tonnes.

Since installing the Drawer Filter Magnets, EcoVyn has established that a 20 minutes cleaning frequency is required, highlighting the high level of metal contamination commonly found in plastic waste.  The ferrous metal found captured on the Tube Magnets ranges from small fine ferrous dust to nails, washers, steel sheet shards and electrical capacitors.

Bunting Magnetics Drawer Magnets at Ecovyn
Ferrous metals captured by the Bunting Drawer Grate Magnet including nails, a capacitor, washer, wire and steel sheet shard

Following the installation of the Bunting Drawer Filter Magnets, controlled laboratory tests have been conducted at Bunting’s Master Magnets facility in Birmingham which indicated that 99.9% of all ferrous metals had been removed.

The final plastic product produced by EcoVyn is then used to manufacture products such as pipe, internal windows, beading, picture frames, and shoe soles.

For further information on separating metal from plastics during the production of the virgin product or during the recycling process, please contact the Bunting team on:

Hillhead Attracts Bunting Europe

Bunting Europe Exhibit at Hillhead for the First Time

Magnetic Separators and Metal Detectors for the quarrying, mining and recycling industry will be on show on stand C9 at this year’s Hillhead exhibition (Hillhead Quarry, Buxton, 26-28 June 2018).

Bunting Master Magnets at RWM17

The joint Bunting Europe and Master Magnets stand will feature Permanent Overband Magnets (self and manual clean designs) and two different types of Metal Detector (the TN77 and QTA).

“Hillhead has always been a really important exhibition for Master Magnets,” said Dave Hills, Bunting’s Head of Sales.  “The Master Magnets Overband Magnets and Metal Detection Ltd range of detectors are widely regarded as industry standards for both quarrying and recycling.”

Held in a limestone quarry in the heart of the Derbyshire countryside, Hillhead is the largest exhibition of its kind anywhere in the world. Continually adapting, it provides a spectacular and unique setting for exhibitors and visitors alike to do business amongst live working demonstrations and static displays.

aggregate-industries-tn77-e1528271468785.jpg

Many quarries use the combination of a Permanent Overband Magnet and Metal Detector to protect processing equipment such as screens, crushers and conveyor belts.  The Overband Magnet removes any magnetic tramp metal leaving the Metal Detector to identify non-magnetic metal parts such as manganese steel digger teeth.

“The recycling of construction waste continues to grow in importance and features strongly at Hillhead,” said Dave.  “With equipment such as the Mastertrax Mobile Eddy Current Separator, we have practical solutions for removing ferrous and non-ferrous metals.”

May through to July is a very busy exhibition period for Bunting Europe and Master Magnets.  Hillhead is just over one month after the very successful IFAT waste and recycling show in Germany and is followed by the Waste ’18 exhibition (Warwickshire Exhibition Centre, 5 July) and CARS (NAEC Stoneleigh, 11-12 July).

“Exhibiting at these events is so important,” explained Dave.  “We meet both existing and potentially new clients and can also show them what our equipment can do.”

For further information on the Magnetic Separation and Metal Detection equipment on display at Hillhead, please contact Dave Hills on:

Phone: +44 (0) 1442 875081
Email: dhills@buntingeurope.com
Via the website

Master Magnets Mobile Eddy Current Separator (1200)

Metal Separation Demos Ignite Interest at IFAT 2018

Visitors to IFAT 2018 Enthralled by Working Magnetic Separators

An Eddy Current Separator was violently expelling non-ferrous metals from plastic waste on one side of the stand, whilst large chunks of fragmented stainless steel were being separated by the SSSC on the other.  ‘Seeing Is Believing’ was very much the basis of the Bunting and Master Magnets stand at IFAT 2018 (14th – 18th May 2018).

“We wanted to showcase our metal separation technology,” explained Dave Hills, Bunting’s Head of Sales, “and that meant having production-sized equipment operating on the stand.  The positive reaction of visitors highlighted the importance of being able to show metal being separated.”

IFAT is the first major waste and recycling exhibition of 2018 in Europe, featuring 3,305 exhibitors and over 141,000 visitors.  Key topics discussed during the week-long show included the filtering of microplastics; more effective recycling of plastics; and the digital transformation of the entire industry.

“Effective metal separation is vital for the successful recycling and reuse of many secondary materials,” said Dave.  “As a specialist in Magnetic Separation, we believed that the IFAT show provided the perfect platform to show recycling companies what is possible.  The show proved to be exceptionally successful and we are now in discussion with companies all over the world.”

Following the IFAT exhibition, many companies who visited the stand are sending samples to the Master Magnets laboratory in the UK for controlled tests to confirm the separation capability of both the Eddy Current Separator and Stainless Steel Magnetic Separator.

“There was a lot of interest in the Stainless Steel Magnetic Separator.  Stainless steel is a problematic material and, due to it’s hardness, can cause real problems in granulators and shredders.  Visitors were often surprised to see large fragmented stainless steel being attracted and separated.  It has generated a huge amount of interest and there is a lot of work to do.”

For further information on the Magnetic Separation equipment on display at IFAT, please contact Dave Hills on:

Phone: +44 (0) 1442 875081
Email: dhills@buntingeurope.com
Via the website

3 Magnet Audits Conducted For Food Safety

Testing Magnetic Separators in Food Processing Plants

In one week, we have conducted Magnetic Separation Audits at three separate UK food processing plants.  The audits form part of the quality management system of each company and are used for both internal and external food quality and safety assessments.

A Magnetic Separation Audit involves the physical testing and inspection of all Magnetic Separators.

Physically Testing the Magnetic Strength

The first part of the inspection assesses the magnetic strength.  This involves using a Pull Test Kit which includes a spring balance and various sizes and shapes of magnetically susceptible steel test pieces.  A Gauss Meter is not used as the readings can be inaccurate and variable.  The physical test involves placing the steel test piece on the surface of the magnet (on a magnetic pole) and measuring the amount of force (in kgs) that is needed to remove the item from the surface of the magnet.  This is then repeated and an average reading recorded.

Visually Assessing the Magnet

The second set of tests involve the visual inspection of the Magnetic Separators and we are checking for:

  • The amount of metal contamination captured by the Magnet;
  • Signs of damage or wear;
  • Weld integrity;
  • Fixings and any related safety issues (e.g. missing restraining nuts);
  • Cleaning regimes and ease of cleaning;

Findings

In the three recent audits there were a number of findings including:

  • Magnetic Separators were in locations where it was extremely difficult to clean and may be considered a safety risk;
  • Welds on a Magnetic Separator had been eaten away by the acidic product resulting in liquid penetrating the Tube Magnet.  This caused the magnets to expand within the stainless steel casing and also destroyed the magnetic field;
  • Damaged Tube Magnets
    Tube Magnets where the welds have failed and liquid has seeped inside the stainless steel casing causing the magnets to expand and lose all magnetic strength
  • The magnetic strength of some Magnetic Separators (especially those that had been installed for some time) was very poor and the level of separation would be minimal;
  • In some locations, Magnetic Separators had been removed from the process but were still registered in the system;
  • The positioning of some Magnetic Separators could be changed to improve the metal separation performance;

Action

Following the Magnetic Separation Audit, a full report, with all the test results, is written and submitted with recommendations.  This then forms part of the food processing company’s internal quality audit system and is refereed to when there are inspections from external third parties and customers.  Commonly the audit is repeated on a annual basis using the same test parameters.

Similar audits are also undertaken in other industries including Plastics Production and Recycling.  An annual health check ensures that the Magnetic Separators are performing to their maximum potential and achieving the separation goals for which they were originally installed.

For more information on the issue of Metal Contamination and Metal Separation, or to arrange a free onsite survey and audit of a particular plant or process, please contact the Bunting team on:

Phone:  +44 (0) 1442 875081

Email:  sales@buntingeurope.com

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