Product Details Supplier Info More products

Fraser Anti-Static Techniques has detailed its static generators for in-mould labelling (IML) applications.

Traditionally, the application of adhesive labels has been the method of decorating products and providing them with information and prices.

Over the last few years, considerable progress has been made to integrate decoration into the injection-moulding process via IML.

By literally moulding the design into the plastic in a single step, all the label adhesion and orientation issues are eliminated.

The finish is seamless and can provide all-over coverage.

The process is reliant on the film of the label being of a similar material to the substrate being moulded, thus enabling a molecular bond to take place during the moulding process.

Other characteristics of the label are equally important due to the static electricity used to pin the label to the mould.

The surface of the label that contacts the mould cavity must be a good insulator to accept and maintain the static charge.

Ideally it should have a volume resistivity of 1012 ohm/mm or greater.

The higher the resistance value, the better the label will accept and maintain the charge without bleeding the charge to ground when it contacts the earthed metal mould cavity.

If the charge is not maintained when in contact with the mould, adhesion is lost and the label will slip from its intended position.

For automated systems there are two ways of charging the label.

In option one, the label is held on a grounded conductive pad – this pad is passed through an electric field acquiring a static charge.

In this charged state, the label is stuck to the inside of the moulding tool.

The label may be charged by either a single point generator, such as the Fraser model 7090, or by a linear bar generator, such as the Fraser model 7080, together with an earth which produces the electric field.

The charging power supply can be turned on manually and left on, or it can be turned on and off remotely by the PLC controlling the robot.

In option two, the label is charged when it is inside the tool.

The label is held to a robotic arm by suction – when the label is in the correct position within the tool a short static charge is applied and the suction is turned off.

This system utilises a number of single generator charge points depending upon the size of the label and results in a more powerful adhesion compared to option one although it does require more engineering.

The system is powered by the Fraser 7324 Generator.

This is a 0-30kV supply, using 24VDC with remote on/off and system-okay monitoring.

An optional analogue control provides fast settings for repeat jobs.

Fraser Anti-Static Techniques

Fraser Anti-Static are specialists in industrial static electricity
problems. Manufacturing and supplying a wide range of static control and
static elimination equipment including static eliminator bars, ionised air
blowers, ionising guns and nozzles, passive static dischargers, static
meters and static generators.

Fraser produces static control equipment for leading machinery manufacturers
and is a major supplier to manufacturing and processing companies
worldwide – either directly or through a network of distributors. Fraser
Anti-Static’s customers are throughout the plastics, packaging, print,
pharmaceutical, food and related industries.

With Fraser Anti-Static’s equipment, problem areas such as electro-static
attraction/repulsion of the product, dust contamination, esd, shocks to
operators can effectively be eliminated.

View full profile