Plastics

The chemo-physical nature of plastics causes an affinity to get statically charged. (see material in Your Problem). Very often, the amount of charge in plastics processing is such, that an active discharge/neutralisation is inevitable. In the following processes IONTIS products are already used by clients for neutralisation, but sometimes also for systematic charging (adhesive effect):
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Process Electrostatic Solutions
Cast Film Production

In cast film lines, an electrostatic charging can improve the heat transfer when the melted pulp meets the chill-roll and also reduce the shrinking effect on the film.

In flat film extrusion an electrostatic edge strip charging provides an adhesion of the film edges on the roller and prevents a “neck-in” of film.

For the initial winding of the film an applied static charge to the rollers can generate an adhesion without the need to use tape for fixation.

Blown Film Production

The extrusion process of blown film generates a static charge, which is further amplified by it passing pulleys and rollers: it needs neutralising ionisers before/during winding-up.

Flowpack & Bag Film Production

The occurring charge in the flowpack films production needs to be neutralised via anti-static ionisers, to ensure the bags can be opened later and stacked/placed properly – prior to a reel change however, a deliberate charging of the film tube can ensure better carrying in the subsequent steps.

To avoid repulsion of bags from stacks and ensure precise alignment at automatic bag machines, the light-weight plastic material needs to be statically neutralised.

Occurring charge is disturbing at the inlet and vane, but also in placing and stacking at a stapler/wicketer and thus needs neutralising ionisation.

Deep-drawing

Caused by deformation and cooling, in the thermoforming process electrostatic charge is generated which must be eliminated with anti-static ionisers to prevent stacking problems and dust attraction.

In inline systems, both sides of the film are discharged/neutralised before forming or closing, so the seal will not contain impurities.

Die-Casting

Moulded Parts can become charged during the cooling process and stick to the form, thermoset material can also produce flash/flakes which remains sticked to the form: the form parts are via ionising nozzles neutralised and blown free.

At the outfeed belt and/or conveyor belts charged parts can adhere and lead to blockages and need to be neutralised with ionisers.

InMould Labeling

The label to be applied is charged with a charging ioniser, to place it correctly in the form and ensure precise fixation with no slipping in the forming process.

Lining & Laminating

Moving web can become charged and need a neutralisation with an anti-static bar before the printing or laminating station in order to ensure safety and productivity.

In the coating process, static neutralisation prevents the formation of unwanted structuration on the surface of the varnish.

Lamination e.g. during the melamine coating a systematic application of charge to the surfaces can avoid slippages of the film and layers and also ensure a bubble-free surface even at high speeds.

Flexoprint

Before the printing process, built-up static charge can be eliminated with neutralising ionisers and air for eventually disturbing trim waste and dust.

Film Cutting

During slitting of film, an anti-static bar can neutralise the occurring charge immediately after the blade roller and thus ensures safe and clean subsequent processing. For the initial winding of the film on the other hand, an applied static charge to the rollers can generate an adhesion without the need to use tape for fixation.

In cross-cutting of film, an anti-static bar placed right after the cutter can neutralise occurring charge and prevent problems in subsequent stacking.

Un- and Rewinding

Moving film which becomes charged passing rollers and pulleys needs static neutralisation at the contact/surface and turret winder for a subsequent clean, trouble-free processing and to avoid streaking.

However, deliberate systematic charging of the material directly at the turret winder can allow for precise alignment of the edges even of smooth film, an exact fixation at the winders core and a tape-less initial winding of flat film. Additionally a telescoping of the roll can be prevented.

Pneumatic Transport

Neutralisation via tube ionisation or ring electrode allows for a trouble-free transport of solid parts in tubes with the use of pressurised air (e.g. trim waste and foil remnants at the inlet of cyclones or prior to the mill).

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