How can a fragment of plastic, a piece of glass or metal be detected before it becomes a foreign body in a food product?
The current reality…
The French trade magazine Process Alimentaire has conducted a survey which revealed that; “product recalls due to foreign bodies have represented 5% of recall notices since June 2020 […]”.
(Source: Process Alimentaire – July-August 2021 – n°1393 – p57 – “Foreign bodies – How to detect the invisible”)
From Mafdel’s food industry customers, there is a crucial question; “how can we be certain that the blue TPU will not be found in our food products?”
To which, our response is:
“There is no miracle solution but Mafdel’s monolithic belts are the least likely of all belting products to shed contaminating material. Zero risk however, does not exist!”
Whilst our response is true, there has been undeniable technical progress made in area of metal detectability in plastics. This valuable feature is now available in several new Mafdel belting types. An inert and food-compliant (EU 10/2011 hygiene standards) component can now be blended with the same premium quality TPU material that is used in our standard TPU products to provide an enhanced level of food safety.
The result is a belt that, were it to shed material from mechanical impact, those pieces stand a far higher chance of being detected using a standard metal detector. The risk of plastics contamination is significantly reduced.
3 belts are now in our metal detectable range:
– Blue Del/Flex V-belt,
– ATC-63 blue belt
– Round belt, blue Del/Flex.
Their main and common characteristics are:
– Monolithic, waterproof and rot-proof.
– Resistant to water, detergents, animal and vegetable oils and fats.
– Temperatures resistant from -20°C to +70°C
– Quiet operation
– Metal detectable.
All technical specifications are available on the appropriate product sheet Mafdel-Belts-Metal-Detectable-EN
A bit of background…
Mafdel positively driven monolithic belts have been with us for a number of years and they have been a major game changer when taking belt hygiene on to higher levels. Experience and confidence in the market has grown and most major conveyor belt manufacturers have a product in their range that is monolithic or, at least, fulfils the role of a hygienic monolithic belt. Industry has also embraced the monolithic belt and many meat and poultry factories will now have a number of these incredibly hygienic and environmentally friendly belts in place.
The word monolithic describes an ‘unchanging structure’ or ‘single material’ so, any belt that has more than one component for example, a belt containing cords, is not actually monolithic but a reinforced or dispersed cord type and this doesn’t really achieve the goal of removing fabric contamination from food manufacture.
When comparing the two types, it’s important to understand the differences and consequential advantages of working with truly monolithic belts. It’s also important to know that truly monolithic and dispersed cord belts work in significantly different ways. Understanding this fundamental difference is important to get the best from a Mafdel belt. Working with a truly monolithic belt means that the joining method is simpler, quicker, is totally free from fabric and provides an opportunity to create open, more hygienic and less expensive conveyors.
How do they work?
Unlike corded types, truly monolithic (no fabric or cords) should NEVER be tensioned. So, how does a zero-tension monolithic belt actually work without reinforcing cords?
All belts elongate to a greater or lesser degree, either with applied pretension or through elongation in operation due to the applied load. In the case of a Mafdel positively driven monolithic belt, it is designed to elongate up to 2.5% to achieve its full load capacity during operation and then relax back to its original state when the load is removed. This principle requires a feature where the tooth pitch of the belt is 2.5% less of that of the sprocket. This means that the sprocket allows the belt pitch to change according to load and is a key design feature and will work like this for many years.
To illustrate this, if you take a close look at the photo of a Del/Drive 25 above, you’ll notice that the tooth at the bottom of the sprocket is in contact with the drive bar on the belt but, as you go clockwise, the gap between the drive bar and the tooth becomes progressively bigger. This is because the pitch of the belt is smaller than the pitch of the sprocket. If you apply the aforementioned 2.5% tension, all teeth will engage and the belt is then at full power. Reduce the load, the belt pitch reduces and tooth contact reduces again. The load creates the tension between it and the drive sprocket.
The key principle is that the zero tension allows the belt to ‘creep’ on the sprocket during elongation, allowing the movement of the teeth in the sprocket. For a truly monolithic belt, this is essential.
So, what happens if I tension a positively driven monolithic belt?
Well, two things happen. firstly, the applied pre-tension takes the place of available load capacity so, when you tension, the belt is already heading nearer to its maximum load capability. When you then add the load to be conveyed the belt is overloaded with the belt tooth pitch being extended longer than the sprocket pitch. This results in the belt jumping the sprockets.
The other issue is that the belt will no longer drive against the faces of the drive bars and has now become a friction drive where the belt is now driven by the top of the sprocket tooth and the back of the belt. This hinders the movement of the sprocket against the back of the belt. If the back of the belt cannot move against the top of the sprocket, there is a high risk that the teeth may run over the top of the teeth and again, you have a jumping belt. If you remove the pre-tension and provide some catenary sag, the jumping disappears, and the belt runs as it was designed to do.
Mafdel truly monolithic belts offer many advantages over their fabric reinforced counterparts.
If you want to discuss this further, contact an expert at Mafdel.
Several families of conveyor belts are available on the market.
We would like to introduce you to the Positivebelt.
This single-material belt offers perfect guidance with its double row of moulded-in teeth.
This design makes it easy to clean and ensures optimum hygiene.
This single-material conveyor belt complies with the most stringent European and international standards. In particular for the food industry.
It can benefit from an anti-microbial treatment in the mass, which prevents the proliferation of bacteria, reduces the development of odours and thus guarantees an optimal level of hygiene.
This belt is used in :
– the meat and poultry industry,
– the fish and seafood industry,
– canning industry,
– in industrial bakeries and pastry shops.
Would you like to know if it is suitable for your production or packaging site?
Please contact one of our experts.
Closure for the festive season
Mafdel company will be closed on 24-25/12, and 31/12 – 01/01. The activity will be reduced throughout week 53.
We wish you a Merry Christmas and happy new year. Take care of yourself and your family during this difficult time.
Covid-19: MAFDEL is committed to ensuring the continuity of your processes
As the world is facing the Covid-19 pandemic, our priority is to ensure the health and safety of all. We are aware that our products are a critical element for many production processes and our three production sites remain operational. The fabrication of standard and custom products is also operational but lead times may be extended.
The freight system, however, is subject to influences beyond our control. Under these conditions, we encourage you to anticipate your needs as best as you can.
Our sales teams can be reached through normal channels but the situation may be reviewed subject to future influences.
We wish you good health and that any disruption to your business activities may be short-lived and you recover quickly and successfully.
Mafdel member of EHEDG
MAFDEL is now member of the EHEDG (European Hygienic Engineering & Design Group).
The principal goal of EHEDG is the promotion of safe food by improving hygienic engineering and design in all aspects of food manufacture.
We are proud to manufacture our range of positive belts, the ultimate hygienic solution for food industry.
Meet Mafdel at Anutec exhibition – International FoodTec India.
From 13th to 15th of September 2019, Mafdel is at Anutec exhibition in partnership with Belting Enterprises.
Bombay Exhibition Centre, Mumbai, Maharashtra 400063.
Meet Mafdel at Hannover Messe exhibition – Hall 25 Stand A34.
From 1st to 5th of April 2019, Mafdel is at Hannover Messe exhibition to show your our new range of thermoweldable belts and conveyor belts.
Hall 25 – Stand A34
Hannover Messe – Hermesallee – 30521 Hannover
Construction of a 3600m² production facility.
A new 3600m² production facility was built to increase increasing production demands and optimize the development of new products.
MAFDEL joins the movement La French Fab.
Being proud to manufacture its belts and conveyor belts in France, MAFDEL is now part of the La French Fab movement that internationally promotes industrial know-how and products made in France.
Presentation of our conveyor belts at International Foodtec India (Bombay – India)
Our range of conveyor belts was presented at the International Foodtec India exhibition in Mumbai from 27th to 29th September 2018.
New documentation on retaining clips.
The retaining clips lock the sprockets, wheels and discs to prevent lateral movement on a 40x40mm square shaft.
See our documentation and contact us for more information.
Presentation of DEL/DRIVE and POSITIVEBELT positive drive belts at the NIBA convention.
DEL/DRIVE and POSITIVEBELT Positive Drive Tapes were presented at the United States Conveyor Belt Manufacturers and Distributors (NIBA) Annual Convention from September 12 to 15, 2018.
Discover Mafdel’s products at Hannover Messe exhibition – Hall 22 Stand B31
From 23rd to 27th of April, Mafdel is at Hannover Messe to show you our range of thermoweldable belts and conveyor belts.
Hall 22 Stand B31
> Hannover Messe – Hermesallee – 30521 Hannover
Meet Mafdel at Hannover Messe exhibition – Hall 25 Stand G19
Meet Mafdel at Hannover Messe exhibition, from 24th to 28th of April and discover our range of thermoweldable belts and conveyor belts.
Hall 25 Stand G19
>> Hannover Messe – Hermesallee – 30521 Hannover
Meet Mafdel at Pro2Pac exhibition London – Stand N652
Until 22nd of march, meet Mafdel at Pro2Pac exhibition with our partner GB Belting, and discover our range of extruded belts, monomaterial belts and positively driven conveyor belts.
>> Pro2Pac and Waste-Works – ExCeL London
1 Western Gateway, Royal Victoria Dock, London Docklands, E16 1XL
DEL/DRIVE 50-25 – The new positively driven dual drive conveyor belt
The new positively driven DEL/DRIVE 50-25 conveyor belt has a pitch of 50mm on one side, and 25mm on the other.
It can be run in two configurations:
– DEL/DRIVE 50 conveyor belt equipped with cleats pitch of 25mm
– DEL/DRIVE 25 conveyor belt equipped with cleats pitch of 50mm
DEL/DRIVE 25 – The positively driven 25mm pitch conveyor belt with a maximum width of 1200 mm
The positively driven DEL/DRIVE 25 conveyor belt is now available in a wider 1200mm width.
Compliant with the strictest hygiene standards, it is capable of negotiating small pulley diameters, creating small transfer distances and compact drives.
The NEW range of Mafdel joining tools
We are pleased to introduce the new range of welding tools for use with Mafdel extruded round and V belts (MC50 and MC150) and also conveyor belts up to 200mm wide (MC100 and MC200).
The new generation of Mafdel welding tools benefit from features that optimize and further improve the joining process such as:
– Rapid heat up (2 minutes)
– Electronic regulation
– Temperature indication
– Ergonomically shaped
– High performance PTFE blade
– Thermally insulated
– Integrated stand
>> Consult the documentation for MC50 welding iron for thermoweldable extruded belts.
>> Consult the documentation for MC100 – MC200 welding irons for thermoweldable conveyor belts.
>> Consult the documentation for MC150 welding iron for overlap joining of extruded belts.
New thermoweldable, bi-material v-belt, reinforced with aramid cords.
The Polybelt+ belt complies with the most stringent food standards and offers optimum specifications for roller tangential drive and load transfer.
Highly resistant to abrasion and cuts, the Polybelt+ belt offers great roller flexibility and a very high load capacity.
Available in a cogged format in polyurethane 85 or 95 ShA. It is also very easy to weld using Mafdel overlap welding tools.
POSITIVEBELT positive drive belt reinforced for live roller applications
The POSITIVEBELT positive drive belt is reinforced with aramid cords and offers optimum characteristics for driving rollers.
It offers a high load capacity and good grip while eliminating the risk of slippage.
POSITIVEBELT positive drive belt in polyester elastomer
The POSITIVEBELT conveyor belt made from polyester elastomer offers excellent resistance to elongation.
It can be used on wide spacing and support medium to heavy loads.
In some cases, its low friction coefficient allows for product accumulation.
The POSITIVEBELT belt made from polyester elastomer also offers excellent resistance to temperature variation.