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Complete printing without any contact

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Increase your productivity with Videojet inkjet printers

 

Contactless marking

Inkjet printers rely on various technologies. Depending on these, they are use for marking small or large characters. The deflect continuous inkjet technique is mainly used in industry for small characters. There are three variants of the so-call “drop-on-demand” printing method: piezoelectric pulses, solenoid valve technology and ink bubble. According to these variants, small and / or large characters may be print.

Continuous inkjet technique

In the case of the deflected continuous inkjet technique, the print characters are produce by individual ink drops. The movement of the product on the production line is exploit in order to imprint the numbers or letters one after the other on the surface of the product. This is a non-contact process with the product. Today, this marking technique is mainly use to imprint expiration dates, such as those on yogurt pots, bottles, and cans.

Fragmentation into separate droplets

The inkjet leaves the print head through a nozzle whose diameter varies depending on the size of the drops, and therefore the desire print. A fix frequency ultrasound signal is sent to a piezoelectric crystal located at the rear of the nozzle, and breaks this inkjet into a multitude of drops. Depending on the voltage applied to this crystal, the inkjet, initially in the form of an undivide flow, is transform into individual ink drops.

Recycling unuse ink

When the drops come out of the charge tunnel, they pass under a deflector. Positively charge, this plate attracts negatively charged ink drops and deflects them from their original path. The degree of deviation depends on the negative charge level of the ink drops: the higher the charge, the greater the deviation. The uncharge drops continue their rectilinear path towards the return block and are reintegrate into the ink module in order to be reuse.

From drop to text

Fonts are made up of a matrix of vertical segments corresponding to ink drops. For example, five vertical segments, each with a height of up to seven ink drops, form a character in a font base on a 5 x 7 matrix. The charge level of an ink drop determines its position in the segment. vertical. By moving the printing surfaces, the printer ensures the horizontal alignment of the segments, at a rate also control automatically.

Drop on demand

With the drop-on-demand technique, unlike the inkjet technique, only the drops necessary for printing are produce. With the continuous deflected ink bubble technique, water-based ink is use. The water is heat until bubbles form. The ink is then carried through the nozzles in the form of tiny bubbles. With piezoelectric technology, an electrical voltage is applied to the piezoelectric crystals. This tension induces an expansion of the crystals, which ejects the printing ink out of the nozzle. The volume of drops is regulate by means of electrical pulses.

Solenoid valve printers are only use in industrial applications. The solenoid valves, built into the nozzles, open only when the ink drops are eject from the nozzle.

  • No clogging of the nozzles thanks to a continuous flow of ink – Quick-drying marking – High speeds – Suitable for small characters marking – High resolutions 

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