15 Magnetic Liquids Traps Keep Orange Juice Metal Free

Export Success to Fruit Juice Industry in Spain

In the past 18 months, Bunting has manufactured and supplied 15 Magnetic Liquid Traps to citrus juice producers in Spain.  The magnetic separators are used to capture and remove fine iron from the juice.

Need for Magnetic Separator Protection

Magnetic-Liquid-Trap-Cartridge-md-gasketsFine iron is commonly found in most food processes.  The origin of the metal contamination is often difficult to pinpoint.  Typical sources include:

  • When the fruit is harvested.  Dirt can often have a magnetic constituent and is carried on the surface of the fruit;
  • During transportation.  Even if the fruit is collected in plastic containers, metal contamination can be introduced from the transport (eg rust, metal dust, dirt).
  • When the fruit is processed.  The process of extracting the juice from the orange or grapefruit involves several stages where the fruit is sliced and compressed.  Wear to the process equipment will produce fine metal contamination.

Extracting the Metal Contamination

Due to the fine nature of the metal contamination, high strength magnets are required.  The Bunting Magnetic Liquid Traps are fitted with Neodymium Rare Earth Tube Magnets, the strongest permanent magnets presently available.

20180424_170346
Fine iron contamination removed from fruit juice

The Magnetic Liquid Filters are designed to ensure maximum contact is made between the juice and the magnetic fields by forcing liquids through a tightly spaced grid of magnets.  Ferrous contamination is magnetically extracted from the liquid flow by the extremely powerful Rare Earth magnet design and held firmly on the surface of the Tube Magnets.

Cleaning of the Tube Magnets is simple.  On a designated frequency, determined by the level of contamination, the lid of the Magnetic Liquid Trap is removed.  The Tube Magnets are attached to the lid and are then manually wiped clean.

Dealing With Acidity

Fruit juices are naturally acidic, ranging between 2.00 and 4.80.  This level of acid has the ability to corrode standard welds.  In the Magnetic Liquid Trap, the Tube Magnets are welded onto the lid.  The welds are all to food grade standards.

20180424_161133
Welds eaten away by the acidic juice causing swelling and failure of the magnets

However, if standard welding materials are used, these will pit and corrode over time.  Eventually, the weld will be eaten away, allowing the ingress of liquid into the Tube Magnet casing.  This catastrophically damages the magnets, causing them to swell and lose their magnetic properties.  As the magnet swells, it can also split the outer casing.

Exporting Success

“We are now regularly supplying Liquid Magnetic Traps into Spain,” explained Dave Hills, Bunting’s Head of Sales.  “Our local representative has done a great job in helping the local citrus juice producers.  He understands the industry and fully understands the challenges.”

For further information on Magnetic Separators used in removing metal contamination from fruit juices or for any food processing application, please visit our website or contact us on:

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

 

24 Drawer Filter Magnets Destined for France

Metal Removed From Plastics

24 Drawer Filter Magnets are under manufacture at our European HQ in Berkhamsted, UK.  The Drawer Filter Magnets are destined for installation in a plastics production operation in France.

Bunting_Drawer_Filter_Magnets-8
Drawer Filter Magnets at an early stage of manufacture

“The Drawer Filter Magnet is one of our most popular magnetic separators,” said Dave Hills, Bunting’s Head of Sales.

The order for the Drawer Filter Magnets was secured by Bunting’s local representative in France, BMS.  BMS specialise in providing technical support to the plastics sector.

Drawer Filter Magnet Specification

All 24 Drawer Filter Magnets have the same specification:

  • Model:  LP-1600-PL: Low Profile Drawer Filter Magnet
  • Magnets:  Three (3) high strength Neodymium Rare Earth Magnets;, three 25mm diameter stainless steel
  • Dimension of the opening:  150mm square
  • Height:  180mm
  • Rows of Magnets:  One
  • Flanges:  Bottom and top included, 6.35mm thick
  • Slide gate:  6.35mm thick
  • Viewing port:  Unit features a 9.5mm thick clear polycarbonate drawer front

Application

During the manufacturing process of any plastic or plastic product, it is possible for metal to be introduced into the process.  This could be from a wide variety of sources including the wear of processing machinery.

Bunting_Drawer_Filter_Magnets-0346

If metal contamination is not removed, it can damage processing equipment and result in increased final product rejects.  The Drawer Filter Magnets are used to attract, hold and thus remove any magnetically susceptible metal contamination.

Another Export Order

“This is another great export order for Bunting,”said Hills.  “Despite all the concerns about BREXIT, we continue to work hard supporting our regionally based distributors.  This is paying dividends as our sales overseas continue to rise.”

For further information about metal separation equipment designed for removing metal during the plastic or plastic product manufacturing process, please visit our website or contact us on:

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

Other Plastics Industry 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

 

59 Pastry Products Potentially Contaminated with Metal

Tesco, Aldi and Nisa Recall Pastry Product Due to Potential Metal Contamination

On the 2nd June 2018, the Food Standards Agency announced that the Addo Food Group was recalling batches of chilled pastry products, including sausage rolls, pasties, pastry pies and slices because of potential contamination with small pieces of metal wire.  This is the latest food safety recall due to metal contamination and the announcement comes seven days before the start of National Food Safety Week.

Addo Food Group manufacture the chilled pastry products as own-branded products for major UK supermarkets Tesco, Aldi and Nisa, as well as those produced under the Walls and Millers brands.  The extent of the recall is substantial, with 59 products being recalled.

How Does Metal Get Into Food?

Unfortunately, food product recalls due to metal contamination are relatively common with 6 Food Safety Scares reported by the UK Food Standards Agency in 2017.

Metal In Food-1127

However, with the correct combination of Magnetic Separators and Metal Detectors, such disastrous and costly product recalls should not happen.

Metal can enter the food production process at a number of stages:

  1. Metal can be present in the foodstuffs being delivered.  To prevent such an introduction of metal into the process, many food processors pass the in-feed material over Magnetic Separators and through Metal Detectors;
  2. Processing equipment wear and failure (e.g. screen break, pump collapse, etc) can cause metal to enter the process stream;
  3. Accidental introduction by people on site;

However, with the right combination of metal separation and detection equipment, such metal can be found and removed before any finished product leaves the production facility.

How To Prevent Metal Contamination

The vast majority of food processing plants have Magnetic Separators and Metal Detectors installed.  Many of these have been in operation for many years which, in some cases, can be decades.

Bunting Magnetics Pull Test Kit
Demonstration of how to use the Bunting Magnetics pull test kit to measure the strength of Tube Magnets and Plate Magnets

During some recent Magnetic Separator Audits at UK food processing plants, we have found Magnetic Separators that have been:

  • Damaged and no longer have any magnetic strength;
  • Moved and are positioned in such a way that it is very unlikely to capture any metal contamination;
  • Cleaned too infrequently, resulting in a substantial build up of captured metal until the magnet face is full and the Magnetic Separator no longer operates;
  • Purchased and installed without any check of the magnetic strength, which subsequently turns out to the very weak;
  • Installed many years previously and now provides limited protection due to the poor magnetic strength;

To prevent metal contamination problems, it is advisable to have an annual audit by an external third party.  This audit then forms part of the quality and safety management system.

It will be interesting to determine the cause of the latest food recall due to metal contamination, but it will take longer to damage the reputation of the manufacturer Addo Food Group and consumer confidence in the affected products.

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

Via the website

 

 

 

6 Metal in Food Safety Scares in 2017

UK Food Standards Agency Reports 6 Metal-in-Food Problems in 2017

Six warnings of UK food being contaminated with metal fragments were reported by the UK Food Standards Agency in 2017.  The food safety warnings ranged from sweets to meat products.

Metal In Food Safety Warnings 2017

Greencore recalled various brands of Chicken and Bacon Caesar Wraps because of concerns that the products contained metal fragments (20 December 2017).  Greencore, as precautionary measure, recalled various brands of Chicken and Bacon Caesar Wraps.  The products, manufactured by Greencore, were sold in Aldi, Co-op Food and Morrisons retail stores.

Athole Tablet Ltd recalled tablet products because of possible contamination by small pieces of metal (31 August 2017).

William Santus & Co recalled Uncle Joe’s Liquorice & Aniseed Extra Strong Mints (35g tins) as there were concerns that the sweets may have contained small pieces of metal (15 May 2017).

Morrisons recalled Trimmed Beans because of the reported presence of small pieces of metal (20 April 2017).

Metal Found In Morrisons Green Beans

Quorn Foods Ltd recalled a batch of its frozen Quorn Meat Free Mince because of the presence of small pieces of metal (2 March 2017).  The affected product was only on sale at Tesco from 27 February 2017 to 1 March 2017.

Lotus Bakeries UK Ltd recalled Lotus Biscoff Crunchy Biscuit Spread because of small metal contamination concerns (2 March 2017).  This product was sold at Tesco, Sainsbury’s, Morrisons, Asda, Waitrose, Ocado and Nisa stores.  In addition, batch number 7005109 with ‘best before’ date 5 February 2018 has also been sold through East End Foods.

How Does Metal Get Into Food?

Metal In Food-1136All of the foods listed have been processed and it is during that process that metal can contaminate the product.  Food entering a process plant will potentially go through stages of washing, size reduction (e.g. cutting, mashing, slicing), mixing, forming, cooking and packaging.  Metal can be introduced from the wear or failure of processing equipment, or through human error.  In fact, it is not uncommon for metal to contaminate food.  However, it is unusual that metal contaminated food reaches the end consumer.

All food companies use a combination of Magnetic Separators and Metal Detectors to separate and detect the metal.  When metal contaminated products are found to reach the consumer, it can be concluded that this safety equipment failed.

Reviewing the performance of the Magnetic Separators and Metal Detectors on a regular basis is important to ensure that any metal contamination problem is identified and dealt with at the factory.  Regular audits will check the integrity of the Magnetic Separators, assessing and recording the magnetic strength and reassessing the location.  Audits for Metal Detectors will check the application, assessing detection sensitivities.

Often such audits find that changes in the process or product (including packaging) mean that the performance of the Magnetic Separators and Metal Detectors is no longer optimised.

Thankfully, metal in food safety alerts remain relatively infrequent in the UK, although each one causes significant financial and reputation damage to the producer and food retailer.

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

 

 

 

Fish Cakes Contaminated with Metal

Youngs Seafood Recalls Metal and Plastic Contaminated Fish Cakes 

In February 2018, Young’s Seafood Ltd recalled its Chip Shop Fish Cakes 6 pack due to the possible presence of pieces of metal and plastic in some packs.  The presence of metal and plastic makes this product unsafe to eat and presents a safety risk. The affected product is sold in some Farmfoods and Heron Foods stores.

Youngs is a leading British producer and distributor of frozen, fresh, and chilled seafood, supplying approximately 40% of all the fish eaten in the United Kingdom every year.  However, this product recall damages their brand and customer confidence.

Where Does Metal Contamination Come From?

Metal contamination is commonly found in food processing plants.  It can be present in the food or ingredients delivered to the processing plant, or introduced during the production process.

Food producers use a combination of Magnetic Separators and Metal Detectors to ensure that the metal contamination is removed before the final packaged food is despatched to supermarkets and sales outlets.

So How Could This Latest Food Scare Happen?

Youngs is not the first or last major food producer to face a product recall due to metal contamination.  Most food producers have installed suitable Magnetic Separators and Metal Detectors.  However, often the contamination issue is a result of old equipment no longer adequate for the application, a failure of equipment, or a change in the process.

Magnetic Separators do not lose magnetic strength over time unless they are damaged or subjected to high temperatures.  However, it is important to annually check the magnetic strength and integrity of the Magnetic Separators.  This can be easily done using a Magnetic Pull Test Kit as part of a Magnetic Separator Audit.

Bunting Magnetics Pull Test Kit

The Magnetic Separator Audit also reviews changes in the production process and may propose the relocation of some equipment to ensure that maximum protection is maintained.

Metal Detectors are often used later in the process, once the product is made and after packaging.  The settings of the Metal Detector need to be regularly checked, especially if there are changes in the production process, product or packaging.  Also, settings on the Metal Detector may be accidentally altered, reducing the sensitivity and resulting in metal contamination being missed.  Again, an annual Metal Detector Audit will review the performance and settings and ensure that there is maximum protection.

Unfortunately, reports on metal contaminated food are not unusual.  Other examples include:

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

42 In Line Magnets Ensure Baby Food Is Metal Free

Magnetic Separators Remove Metal During Baby Food Production

A Baby Food producer based in Germany has purchased a further 14 In Line Magnetic Separators to guarantee a metal-free product.  The latest 14 In Line Magnetic Separators are in additional to 28 already supplied and installed as they equip their food manufacturing plants across Europe.

Bunting Magnetics In Line Magnet-9528In Line Magnetic Separators are designed to easily fit into an existing pneumatic or gravity fed pipeline transporting food stuffs.  Both ends are fabricated to connect with the installed pipework.  The central body of the In Line Magnet has a strong Rare Earth Neodymium Plate Magnet.

A key feature of the In Line Magnetic Separator is that there is no restriction to the product flow.  In this particular project, baby food passes through the body of the In Line Magnet and any ferrous or weakly magnetic materials are attracted by the strong magnetic field and then held against the face or the Plate Magnet.

The Plate Magnet has a tapered step, which intensifies the magnetic force and also provides an area to collect rogue metal contamination.

As the Baby Food has chucks of vegetables and meat, it was important that there was no restriction to the product flow where the food could be damaged or blockages could occur.  The Magnetic Liquid Filter, which uses Rare Earth Neodymium Tube Magnets, would not have been suitable for this application.

Bunting Magnetics In Line Magnet-9552Periodically, the captured metal is cleaned off the face of the Plate Magnet.  Access is designed to be simple and quick, with the Plate Magnet swinging away from the body on hinges.

All 42 In Line Magnetic Separators are designed for use in pneumatic pipelines up to 15 psi.  They are manufactured from Stainless Steel there are a range of standard sizes available.

For more information on the Pneumatic In-Line Magnet or any Magnetic Separator, please contact our team on:

Phone:  +44 (0) 1442 875081

Email:  sales@buntingeurope.com

Via the website

Reviews of typical food processing plant layouts with suggested locations for Magnetic Separators and Metal Detectors include:

The Challenges of Removing Fine Iron from Powders

Magnetic Separators Designed for Processing Powders

Removing metal contamination when the tramp metal and material is granular is far more straightforward than when in a powder form.  To determine the best solution to remove fine iron contamination from powders, it is necessary to have a good understanding of the way the fine materials behave.

Powders are produced and used in a wide variety of industries including food, pharmaceuticals, refractories, and chemicals.  It is estimated that 80% of materials used in industry are in a powdered form.

flour-791840_960_720A ‘powder’ is defined as fine dry particles produced by the grinding, crushing, or disintegration of a solid substance.  The nature of a powder means that the handling and processing tends to be problematic as powders exhibit similar properties to both solids and liquids.

Metal contamination, commonly in an iron form, can be introduced into a material at any stage within a process.  Tramp metal that is undetected and remains in the product before the powder production stage, becomes significantly reduced in size and, subsequently, increasingly difficult to extract.

Magnetically susceptible metal contamination (i.e. iron) is commonly removed using Magnetic Separation Equipment, which traps metal using Ceramic Ferrite or Rare Earth Neodymium Iron Boron (Neodymium) Magnets.  Although there are Magnetic Separators where the magnetic field is produced via an electrical current, the vast majority utilize permanent magnets such as Ceramic Ferrite and Rare Earth Neodymium Iron Boron (Neodymium).  Ceramic Ferrite Magnets produce low strength but deep magnetic fields, while Neodymium Magnets create the strongest permanent magnetic presently commercially available.

Where Does The Metal Originate?

Metal contamination commonly originates in a powder from two sources:

  1. Primary large tramp metal, such as a nail, screw or bolt;Tube Cartridge Magnets Bunting Magnetics-5
  2. Primary or Secondary fine tramp iron. Primary fine iron or magnetic particles are often present in the raw material.  This originates from primary processing, transportation, or even naturally occurs in the original material.  Secondary fine iron originates from a larger tramp metal source that has been reduced in size during the process.  Typically, this could be from a nail, screw or bolt that has been through a size reduction process, or from damaged or worn processing equipment.  Another common source of secondary fine iron contamination is rust, falling into the process from weathered and worn processing equipment such as chains, hoists, and building cladding.

The separation and detection of tramp metal is easier when the metal contamination is in a larger form and can be successfully removed using a wide range of suitable Magnetic Separators and Metal Detectors.  Magnetic Separators using standard strength Ceramic magnets, with deep magnetic fields, are ideal.  A good example is the Plate Magnet, often installed in a chute, in a housing, or as part of an In-Line Magnetic Separator.

Quicktron05A_Sodium Bicarbonate 2

Larger metal contamination is also easier to detect on a Metal Detector.  Metal is detected as it passes through the coil of the Metal Detector and an automatic reject system removes it from the flow.  For detection, the magnetic field generated by the Metal Detector has to see a state change.  Finer sized metal produces a lesser state change and thus increases the difficulty in detection.

In a project in Pakistan, a processor of fine Sodium Bicarbonate is using a Quicktron Metal Detector to remove the larger tramp metal.

Removing larger tramp metal with a Magnetic Separator and Metal Detector prior to the processing stage not only prevents the metal from being reduced in size (e.g. converted into a secondary source of fine iron contamination), but also protects delicate processing equipment such as granulators, shredders, and mills from being damaged by the metal.

Once in a powder form, there are processing parameters to consider when assessing the optimum method to remove fine iron contamination.

How Does a Powder Flow?

When a powder is sprinkled, it remains light and free.  However, when the same powder is vibrated or compressed, it may become very dense and even lose the ability to flow.

Individual grains in a powder cling to each other in clumps, in accordance with the Van der Waals force.  This coagulation often results in the fine iron being trapped in among clean product.  The ability of any Magnetic Separator to attract, hold and separate the fine iron is dependent on the iron being as close to the magnetic field as is physically possible.  If the fine iron contacts the surface of a Magnetic Separator with a high strength magnetic field, it will be held.  However, when the fine iron is held inside a coagulation of powder, then it could be held out of the reach of the maximum magnetic force.  Thus, it will not be separated.

The way a powder flows impacts on the design of the Magnetic Separator.  Powders flowing in a hopper may experience classic flow problems such as ratholing, bridging or flooding, all of which could be exacerbated by the design of Magnetic Separator.

Different Designs of Magnetic Separator

Plate Magnets Bunting Magnetics-9797High strength magnetic fields, as produced by Neodymium, are needed to capture fine iron metal contamination.  There are four main magnet configurations suitable for handling powders.

  1. Tube Magnets (also known as Rod Magnets and Cartridge Magnets), often in a multi-rod Grate configuration;
  2. Flat-faced Magnetic Plates;
  3. Cone-shaped Magnets;
  4. Magnetic Drums with a curved magnetic arc;

Although occasionally a Tube Magnet may be used on its own, it is more commonly part of a larger multi-cartridge Grate system.  The Magnetic Grate is designed to fit inside a hopper, or can be supplied complete with a housing (i.e. as a Drawer Filter Magnet).ff-neo-4

In operation, powder falls freely onto the surface of the Tube Magnet where fine iron strikes the surface and is held by the strong magnetic field.  To ensure that the powder makes contact with the Cartridge surface, deflectors are often deployed above the gaps between the Cartridges.

Powder build-up on the surface of a Magnetic Cartridge will reduce the separation efficiency.  Also, in severe cases, a slight build up on the surface of the Cartridge may quickly cause a blockage of the whole housing.

Such blockages can be prevented by ensuring that there is optimum space between the Magnetic Cartridges.  Also, in some cases, the mounting of an external vibrating motor on the side of the hopper or housing will provide enough disturbance to prevent any material coagulation.  The frequency of the vibration needs careful consideration as it could affect the flow ability of the powder.  Additionally, when vibrators are used, the Magnetic Cartridges need to be manufactured to withstand prolonged periods of vibration.

Bunting Teardrop Tube Magnet

‘Teardrop’ shaped Tube Magnets are specifically designed to stop the build-up of fine powder on the surface.  The sharp edge of the teardrop faces up into the product flow and allows material to flow around the edge and into the magnetic field.  Magnetic particles are captured and held underneath the Tube Magnet.

Flat-faced Magnetic Plates are ideal when it is possible for the material to flow over the surface.  For fine iron removal, the Magnetic Plates would use high strength Neodymium Magnets.  This magnetic field is further enhanced when a Tapered Step is added to the face of the magnet.  Captured iron migrates behind the step and away from the material flow, reducing the risk of re-entering the cleansed product.

As well as being fitted into chutes, Magnetic Plates are incorporated into housings.  The Plate Housing Magnets resist bridging and choking to remove tramp iron and ferrous fines from flow-resistant bulk materials.  The stainless steel housings mount easily to enclosed spouting or directly on processing equipment.

There are optional square, rectangular, and round adapters for easy connection to existing chute work.  A baffle at the top of the housing helps break up clumps and directs product flow over the unit’s two powerful Plate Magnets.

Bunting Magnetics In Line Magnet

Plate Magnets are also used in In-Line Magnets and there are two designs:

  1. Gravity In-Line Magnets (GIM) – The Plate Magnets are positioned in round, sloping spouting where material is under gravity flow.  For effective tramp metal capture, the spouting should be angled no more than 60° from horizontal;
  2. Pneumatic In-Line Magnets (PIM) – These designs are for use in dilute phase pneumatic conveying systems (up to 15psi). They can be installed easily with optional factory-supplied compression couplings and work best in horizontal runs with the plate magnet down to take advantage of material stratification;

Another design of In-Line Magnet is the Center-Flow, although the magnetic field is generated in a Cone configuration instead of a Plate.  The Magnetic Cone is positioned in the center of the housing, allowing the powder to flow in the space left between the housing.  Center-Flow In-Line Magnetic Separators are commonly used in dilute-phase pneumatic conveying lines up to 15psi.

To achieve optimum contact with the product flow, a conical magnet is suspended in the center-line of the housing.  This tapered, exposed-pole cartridge has a stainless steel “nose cone” to direct the flow of materials around the magnet.  The tapered poles of the cone magnet allow ferrous fines to collect out of the direct air stream.  Additionally, the trailing end of the magnet is an active magnetic pole and holds any tramp metal that is swept down the cone.

Both types of In-Line Magnet are designed with clamps and doors to enable easy access for cleaning.

drumIn specific applications, a high strength Neodymium Drum Magnet will enable the best level of separation.  The Drum Magnet is gravity-fed, usually via a Vibratory Feeder.  The Drum Magnet has a stationary high-strength magnetic arc positioned inside a rotating outer shell.  When material flows onto the drum magnet, the magnetic field projected by the stationary magnetic assembly inside the shell captures fine iron and holds it securely to the drum’s stainless steel surface.  With contaminants removed, the good product falls freely to a discharge point.  As the drum rotates, the captured fine iron travels along the drum surface and out of the magnetic field, where it is discharged.

There are various magnetic field configurations possible, but the most suitable for removing iron from powder is one that produces a Radial Magnetic Field.  This ensures that once captured, the fine iron does not leave the Drum surface until it moves out of the magnetic field.

Processing powder on a Drum Magnet presents more difficulties that other designs of Magnetic Separators.  Firstly, it is recommended that the Vibratory Feeder has an air bed to produce a consistent feed of powder.  Standard Vibratory Feeders may deliver powder in clumps, significantly affecting the separation performance.

Secondly, the shell of the Drum Magnet should be rotated at high speeds.  This will result in some of the powder pluming, and this can be minimized by keeping the distance between the end of the Vibratory Feeder Tray and the rotating surface of the Drum Magnet to a minimum.

The high rotation speed of the Drum Magnet significantly reduces the amount of product lost to the magnetics.  This is because there is less material on the surface of the Drum at any one time, reducing the chance of entrapment.

The use of Drum Magnets operating at high rotational speeds has been very successful in removing fine iron from abrasives, refractories, and other applications where the material has a high specific gravity.

Ensuring Powder is Metal-Free

As the demand for finer and purer powders increases, so does the need to remove even the finest iron.  Understanding the properties and behavior of the powder is vitally important when considering the optimum method of fine iron separation.  Often the ultimate solution is a series of Magnetic Separators and Metal Detectors located at strategic points within the process.

For further information on removing fine metal contamination from powders with Magnetic Separators and Metal Detectors please contact us on:

Environmental Issues Highlighted at Interplas 2017

Interplas Exhibition Well Supported by Plastics Industry 

On the morning of day 2 of the Interplas 2017 exhibition (26th – 28th September, NEC, Birmingham, UK), BBC Radio 5 Live featured a news item reporting that UK pub operator, JD Weatherspoon, had decided to stop using plastic straws.  This announcement highlighted the challenges facing the plastics sector.

Bunting Magnetics Europe at Interplas 2017

Interplas 2017 is the UK’s premier show for the plastics sector and proved to be a great success.  As experienced at many UK trade exhibitions, the footfall was not as seen at shows in the USA, Germany or other European countries, but the visitors to the Bunting stand had specific metal contamination issues in their plastics production process that needed a solution.

However, plastics and their environmental impact continue to hit the headlines.  Indeed, there were two large posters on the stand of the British Plastics Federation asking:

“As we supply equipment both to companies manufacturing primary plastic products and recycling plastics, we see the problem from both sides,” said Dave Hills, Bunting’s Head of Sales.Bunting Magnetics Europe at Interplas 2017

“Even when manufacturing primary plastics, it has been common and good practice for companies to recycle and reuse their plastic waste for many years.  Indeed, this often necessitates the need for Magnetic Separators and Metal Detectors, removing any rogue metal introduced during this recycling process.”

“However, the real challenge is collecting, processing and then producing a usable plastic product from recovered secondary plastic materials.  Again, we have installed Metal Separation Systems to remove ferrous and non-ferrous metals (eg at Recapture Plastics), but there remain challenges with the end market for the final recycling-sourced plastic product.”

There appears to be a growing appetite for focusing on the issue of plastics in the environment.  The implementation of charges for plastic bags by firstly the Welsh, and then the UK governments may be the first of many initiatives to reduce the use of plastic products.  The latest announcement by JD Weatherspoon about banning plastic straws is expected to be followed by similar announcements by other major coffee shops and food outlets.

At Interplas 2017, the vast majority of the exhibitors were focused on primary plastic production.  With the ever-increasing global focus on environmental issues, we wonder how different the exhibitor and visitor make-up will be at Interplas 2020.

For further information on Magnetic Separators and Metal Detectors for removing metal during the primary plastic production process or in a recycling operation, please contact us on:

 

Export Success at FIP Solution Plastique Exhibition

Bunting Magnetics Support BMS France at Plastics Show in France

Dave Hills, Bunting Europe’s Head of Sales, was on the stand of local distributor, BMS France for the duration of the major annual international plastics exhibition, FIP Solution Plastique, held in Lyon, France between 13th and 16th June 2017.  Dave gave us this report:

“Last week [13th to 16th June] it was hot and humid in Lyon.  And it was debatable whether the air conditioning in the exhibition centre was actually working.  However, the turnout for the show was fantastic.

FIP Solution Plastique is the number 1 show for the plastics sector in France.  There was a technically and globally diverse group of exhibitors present, all specialising in working in the plastics industry.

We were present to support our local distributor BMS France.  Being on the stand gave me the opportunity to develop relationships with the BMS team, deliver some product training, and also learn about the plastics market in France.  I also had the opportunity to meet the BMS Spain team, based in Barcelona.

It was also good to meet and talk with other equipment suppliers, many of who had equipment on display at the show.  It was interesting to hear their feedback on present market conditions.  We find exports visits such as this invaluable.

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Along with our Metal Detectors and Magnetic Separators, BMS had a wide range of equipment on the stand.  There were 3 operating Boy Injection Moulding Machines on one stand and a Woojin Injection Moulding Machine on a 2nd stand.

There were also 5 Wanner Granulators, and Pixargus had a live demonstration of their unique surface inspection and dimension measurement system.

The extensive range of products and the interactive nature of the BMS France stand made it one of the busiest at the show.

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It was interesting to think that all of the aforementioned equipment relies on the plastic pellets and raw materials being metal-free.  And getting metal out of plastic is our speciality.

BMS France was able to talk to visitors about a complete solution, with demonstrations of the quickTRON 03R Metal Detector and FF Drawer Filter Magnet removing both ferrous and non-ferrous metals.

Being in France also gave me an opportunity to hear people’s thoughts about BREXIT.  Unlike some other European countries that I have visited since the referendum, people in France have a very negative opinion about the UK leaving the EU.  In fact, many people asked whether the decision could be overturned.  This just highlights the importance of a negotiated exit that involves free trade.

However, the atmosphere at the exhibition was very positive.  Indeed, BMS France sold 2 Injection Moulding Machines at the show, which was fantastic.  And both will be protected by Bunting Metal Detectors and Magnetic Separators.

An excellent show and we will be back in 2018.”

For further details on the Bunting range of Magnetic Separators and Metal Detectors used to remove metal from virgin and recycled plastic, please contact our technical sales team on:

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