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The importance of backup rings to O rings

Backup rings are ultimately used to help stop o ring migration, and they achieve this in both static and dynamic fluid power applications as the pressure cycles occur, preventing the extrusion of an o ring in the gap.  Ultimately a backup ring is a rigid ring that...

Gasket manufacturing process explained

Specialist Sealing Products have been providing high-quality gaskets to customers throughout the UK for many years. We pride ourselves in the range of gaskets we have available, suitable for a variety of applications across a range of industries.  Rubber gaskets are...

Designing seals for the food industry

There’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...

Storing your gaskets!

A strange headline for a gasket article, we know.  However, it’s an important area and one, which in this sector is often overlooked.  When we think about most products or items in and around our homes and business, we will recognise that most come with manufacturing...

Flange Gasket materials – What you need to know

Getting the most out of flange gasket materials and ensuring the performance of the gasket is not affected when you come to use it, means several things must be taken into consideration.  For example, factors such as their design, how they’re manufactured, installed,...

Spiral Wound Gaskets and Sheet Gaskets

Gaskets come in a range of different shapes and sizes.  All are offering similar functionality; gaskets are produced using a range of different materials to suit a range and a variety of environmental factors, industrial uses, and product requirements.  When it comes...

Benefits of Kammprofile Gaskets

Used to prevent leakage, gaskets are constructed to fit between a range of different sizes and types of surfaces in order to provide the perfect seal.  Typically used in pipes and heat exchangers, gaskets are widely used as industrial sealants.  Kammprofile gaskets,...

Purpose of a Kammprofile Gasket

The ultimate purpose of a gasket is to stop leaks while being able to deal with varying levels of compression.  When it comes to Kammprofile gaskets, these are ideal for standard pipeline and heat exchanger applications.  As due to their grooved metalcore, with a...

Are your gaskets completely compliant?

In industries where gaskets are not just important but essential, there are numerous challenges to be faced and considerations to take on board.  This is especially true when it comes to making sure this “essential” element is also compliant.  With the implementation...

Everything you need to know about Manway Gaskets

When it comes to manway gaskets, we want to keep things simple, introducing them as the small sealing ring found in hatches/openings that are constructed for large tanks. Openings which give people access to the inside of the aforementioned tanks and vessels. The...

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. 

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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