Festo's pneumatic logic cuts build time

Oystar Aerofill, a manufacturer of aerosol filling and closing equipment, uses Festo's integrated multi-layer duct plate technology for the pneumatic logic and control functions of its machines.

By switching to this modular, fully integrated form of pneumatic valve block, the company estimates that it can reduce the average build time of systems by 30 per cent.

Every machine that Oystar Aerofill produces is bespoke - it is manufactured to customer specification - and if necessary can be supplied as a fully ATEX compliant unit for use in the propellant gas filling area of aerosol production.

The company produces three families of products for use on index lines - two of these are pneumatically driven, the other uses electrical servos - together with a family of fully automated high-speed rotary filling and closing machines for use on continuous motion lines.

Index lines are principally used by manufacturers who need to handle a high mix of different types of aerosols, with production runs limited to relatively small batch sizes.

These types of production lines essentially operate on a stop/start basis; each aerosol can, or small group of cans, is moved via a conveyor to the next successive processing stage, and progression of the line is then halted until that particular process has been completed.

The process stage can range from a single function, such as filling, to more complex multi-function tasks such as valve insertion, crimping and gas filling.

Although index lines tend to have a relatively low throughput - the fastest machine that Oystar Aerofill produces for these types of production lines, for example, is the Flexi Pak, which can handle up to 160 cans per minute - they provide a very flexible manufacturing solution.

Changing over production from one type of aerosol can to another is accomplished easily and quickly, especially if the filling and closing machines use high-performance servos to automatically adjust the grippers to accommodate different sized cans, as is the case with Flexi Pak.

Another advantage of index lines is that they are relatively compact, whereas continuous motion lines tend to take up a lot of space on the production floor.

Continuous motion production lines are used whenever throughput is a key factor and therefore tend to be used by high-volume manufacturers.

The types of aerosol filling and closing machines used on continuous flow production lines tend to be larger than those designed for use on index lines, and each machine on the line is usually dedicated to performing one specific function.

The machines also feature far more sophisticated automation - by definition, they are designed for continuous high-speed operation.

Oystar Aerofill's Rotary Pak family of continuous motion aerosol filling and closing machines are a case in point: these machines can handle throughput rates as high as 500 cans per minute.

Although every Oystar Aerofill machine is designed to suit the customer's specific product filling, valve insertion, crimping or propellant filling requirements, many of their basic functions are broadly similar across each product range.

The working heads are modular units, enabling the machines to be readily modified to accommodate different production needs.

Each working head is backed by a manifold containing the necessary control valves for its pneumatic actuators, together with associated components.

Until recently, Oystar Aerofill produced these manifolds in-house from drilled aluminium blocks and subsequently fitted all the necessary adapter plates, valves and tubing.

This approach demanded considerable skilled labour - tying up production capacity - and led to high process costs and lengthy machine build times.

As a result, Oystar Aerofill approached Festo, to investigate whether standard pre-built manifolds could provide a technically viable and more cost-effective alternative.

According to John Blake, business development consultant, said: 'This application was an obvious contender for our integrated pneumatic duct plate technology.

'It uses a multilayer polymer manifold block, with fully integrated pneumatic logic, to provide a standardised module.

'This approach means that we can guarantee the repeatability of each machine head, which was previously very difficult to achieve because it involved manual alignment.

'So far, we have developed three different modules, which can be combined in a variety of ways on Oystar Aerofill's machines to cover a wide range of applications, and which enable individual features to be included or omitted without the need for a complete redesign.

'Furthermore, this type of integration technology helps to minimise both the physical size of the modules and the number of interfaces that are needed, which simplifies installation and maintenance significantly.' The new manifolds require much less tubing - increasing machine accessibility significantly and thereby simplifying servicing and maintenance - and the few pneumatic connections that do have to be made use simple push-fit connectors.

Although the purchase cost of Festo's solution is slightly higher than Oystar Aerofill's previous in-house approach, the purchasing process is much simpler and the company can now order a complete ATEX-compliant control module under a single part number.

But the largest gain is undoubtedly in build-time reduction - Oyster Aerofill has been able to reduce machine assembly time by an average of 30 per cent, which obviously conveys major cost benefits.

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