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Locking bushes from ETP have replaced mechanical clamping elements in a critical application on PET blow-moulding machines.

Connecting the lever arms that open and close the moulds, the ETP-Express bushes allow slip on the shaft if a bottle or preform is stuck.

This avoids damage to the machine and reduces downtime.

Resetting is a quick and simple process compared with the old solution of a mechanical clamping bush that had seven screws to be torque tightened in sequence.

The ETP-Express, available in the UK from Techdrives, is a self-contained bush that connects shafts to hubs without keyways.

A single radial fixing-screw pressurises an internal chamber and expands the walls, gripping the hub and shaft.

Accurate positioning both radially and axially is easy as the screw is tightened.

Once the screw reaches a travel stop, the bush is set and friction evenly transmits full torque over the surfaces.

Up to 1000 mountings are possible.

PET (polyethylene terephtalate) is widely used in beverage containers as it is light, unbreakable, stable and taste free.

It is also completely recyclable.

Blow moulding machines start with a preform that is pre-heated to achieve elasticity.

The preforms are transported by conveyors and feed wheels into the blow moulds.

Depending on the machine type, there can be from four to 36 of these blow moulds on a rotating assembly.

Aluminium is the most commonly used material to reduce inertia and achieve higher speeds – up to 72000 bottles per hour are possible.

The individual blow moulds are opened and closed by a lever arm and these arms are fixed to the actuator using the ETP-Express bush.

Under normal operation, the bush acts as a backlash-free connection.

Should there be a jam from a misfeed, the bush slips at a predetermined torque without damaging the actuator shaft.

Once the machine operators have cleared the jam, it is only a matter of seconds to reposition the mould by loosening the single screw of the ETP-Express.

Downtime is minimal compared with the previous mechanical locking bush.

The low and even surface pressures of the ETP-Express avoid shaft damage and aid a consistent slip torque.

The ETP-Express is a shaft-to-hub connection.

Standard models are available from stock for shafts of 15 to 100mm.

In this blow-moulding application, the ETP Express creates a re-usable connection that is backlash free and easy to set accurately.

With 40 years' experience, Lenze Ltd are specialists in drive and automation equipment for the UK market. Today Lenze employ 60 people and operate with management systems approved to ISO 9001:2008.

Experience and expertise

The engineering comes first. With almost 50 per cent of our staff being qualified engineers, the right-sized technical solution to your problem is our goal. Our vision of right sizing means to work with you in order to achieve the optimum solution in terms of cost and performance.

The complete drive system  

Our products fit together to make the complete drive and automation system. Lenze products include automation, controllers, servos, inverters and geared motors. Our Techdrives division adds essential drive components such as couplings, actuators and locking bushes to complete your design.  

Worldwide, we are there to help you

Lenze companies are in 29 countries and have sales offices in a further 24. Full product information is available on our website and the international helpline makes it easy to contact us.

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