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Threaded Flange

Threaded flanges are probably the most recognisable of all flanges due to their screw thread design that is used to connect it to the pipe. Threaded flanges, also known as screwed flanges (for obvious reasons), require a male and female thread to create a connection...

Slip On Flange

A slip-on flange can also be known as a hubbed flange, which, as the name suggests, has a hub with a very low profile. Why is this important? Because this type of ring type joint gasket has an internal diameter larger than the connecting pipe, allowing you to slide it...

Weld Neck Flange

Also known as tapered hub flanges or high hub flanges, weld neck flanges are a specific type of gasket with a protruding ridge and long neck used to connect pipework and provide you with a high-quality seal. Weld neck flanges, in particular, are a popular choice when...

Nitrile vs Viton® – What is the Difference?

As you start to make a decision about what type of O-rings to purchase for your business, you might wonder what material is the most suitable for your unique needs. Every business operation has different requirements for their O-rings, such as the temperature,...

Aflas vs Viton

When it comes to choosing O ring suppliers in the UK, you’ll find that there are a wide range of materials on offer for you to choose from. Many people find that the options can seem quite overwhelming, with some materials having similar properties but offering...

EPDM Gasket

Both the automotive and construction industries have started to use EPDM gaskets more frequently in recent times. This rubber material is UV light resistant and has many fantastic properties that make this part highly effective for a wide range of processes. Keep...

Metal Gaskets

When comparing gaskets for use within your business processes, you’ll find that these can be made from a variety of materials. Metal gaskets are a very popular option, offering many advantages over other materials. When looking at sealing product options, make sure...

AFLAS o ring

O rings come in many different dimensions, thicknesses, and materials. And it is the various different materials that o rings can be manufactured from that make each o ring unique and suitable for specific applications. In fact, there are hundreds of different types...

O Ring Vulcanization Process

With years of o ring knowledge and experience in o ring vulcanization, we're one of the leading experts in providing the right sealing solution for you. To view our full range, visit our O-ring product page, with a wide selection and something to match every...

What is a Window Seal?

A window seal is something that nearly all of us will have seen in our homes or workplaces and is designed to help make your building more comfortable. Within our range of Sealing Specialist Products, we offer a selection of window seals designed for various...

See our latest catalogue for all the services we offer.

Designing seals for the food industry

food industry sealingsThere’s a number of factors to take into consideration when designing seals for the food industry. That’s because seals used within this sector need to work exceptionally hard in all food processing environments where hygiene and health and safety are of the utmost importance. 

When designing, or indeed looking at the design of a seal for food applications, you must take into consideration: 

Operating conditions 

For example, what application is the seal intended for? Does it experience any movement? What is the makeup of the piece of equipment being sealed, etc.? 

You also need to consider the temperatures, speed, and pressure that the application will be operated at. As well as the maximum and minimum pressure levels, temperature, and speed. 

Knowing how the application will be operated will ensure that the correct seal is chosen and used. 

The fit of the seal 

Knowing how the application is to be assembled allows you to understand exactly where the seal will fit and its role within the appliance. Addressing any fitment issues from the start can save you time, money, and a lot of headaches in the long run. 

Where the seal will be housed 

Knowing where the seal will be housed is vital. 

For example, aluminium housing will require a different choice of material compared to that of stainless housing. 

Seals manufactured using PTFE materials need to be passivated when used with stainless steel, preventing stainless surfaces from pitting. 

Cleaning methods 

Within the food industry, cleaning is critical. A sterile environment is a must, and as such harsh and stringent cleaning methods will be used. Because of this, some seal materials may be eliminated, leading to replacements being required or seal gaskets in need of vital repair. 

Testing seals against cleaning solvents and methods need to be conducted in order to test the seal’s overall performance and robustness. 

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Movement 

Movement plays a big factor in seal design. For example, long or short strokes or even strokes and frequent strokes can lead to the seal becoming starved of lubrication, which will result in excessive wear and tear on the seal. This is known as a linear movement (back and forward). 

Alternatively, the mixed movement will require the seal to handle challenges linked to temperature fluctuations, extreme heat, as well as being able to function during the transition from one motion to another. 

If a rotating motion is in play, then the seal required needs to be able to create low friction, due to the issue of a build-up of heat in these applications. From a design perspective, heat dissipation away from the seal contact area should always be incorporated in order to reduce the heat gradient. 

Static movement is found in many food applications, and this requires no voids to be present in order to avoid bacteria from growing and spreading. For these types of applications, specialist seals need to be designed to bulge, reducing the need for welding joints. 

Stationary stability needs to be considered as it is known that many foodstuffs can solidify if they remain stationary for a period of time. For example, solids like sugar can have a negative effect on many seal materials, and seal designs must bear this in mind. 

Seals must be compliant 

Food hygiene and quality are of high importance, and seals should be FDA approved and compliant at all times. If providing applications outside of the UK, you also need to consider the European Commission food regulations and Good Working Practices. 

Ultimately seals that are designed for the food industry should demonstrate a broad chemical compatibility profile, be resistant to high temperatures and abrasions, and have the ability to withstand aggressive cleaning methods. 

To ensure the seals that you are using are designed to be FDA compliant, safe, and effective, speak to Specialist Sealing Products today. 

The sealing experts in Leeds. 

Read the next article: Gasket manufacturing explained 

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