The core piece of every inkjet plotter are the print heads, and the real know how which determines the quality of the print lays within the packing density. This packing density is defined by the number of jets per head, the control of the firing impulse and frequency, the consistency of the drop flow and drop geometry, and the precision of setting the dots exactly at the predefined place on the substrate. This is the Dot Size Control Technology designed into the Durst Quadro.

Durst developed the Quadro Array Technology which meets and combines all technical requirements. 512 jet outlets per array equate to the highest ever used packing density. Durst also developed the firing impulse electronics which affect every slot and controls dot size and form, the precision of the dot positioning, the ink with constantly flowing temperature control, and a degassing station (lung) within the ink line system to meet the requirements of the dot size regulation. The Quadro Array Technology achieves excellent quality with 400 dpi which can be modulated through the operation software to 600 dpi.

The highly precise fabrication of the carrier plate and the micro meter exact assembly of the slots result in equally spaced jet distances of 127 microns with an excellent straightness of the fluid coming out of the jets.
The compact and modular construction of the Durst Quadro print head makes the simple integration of several print heads in the Rho with different alignment arrangements possible. This influences the resolution as well as the ink dot placement and allows flexibility in the design of print head architecture.
The 512 jets are controlled by eight independent actuators, of which each controls 64 independent jet channels. The single jets are controlled through a serial parallel converter and are arranged in 4 rows. Addressing of the jets can occur individually or in a simultaneous fashion.

The Durst Quadro reaches top quality of the print through outstanding constant drop volume at high consistency of the drop speed and drop form. Next to the above described electronic, the Durst designed intelligent ink supply to the jet outlets is also part of achieving a top quality print.

The ink is led through an ink inlet to the intermediate tank with an ink filter and an electronic standard monitoring system. It then proceeds to the "lung" where it is degassed by an osmotic filter. It is heated in the ink lines within the print plates with high consistency, and kept in motion and led to the piezo print system. The lung and ink leading system in the Quadro head allow for an operation of the piezo head of up to 20 KHz at high dependability and drop geometry consistency.
The printing system can take up to 24 Quadro arrays for CMYK, White and Varnish. The jet head alignment is designed in a way that the white print occurs simultaneously in one process step with the CMYK.

Next to the CMYK ink supply Durst is the first company in the world that also supplies the color "White". A separate ink supply system with anti sedimentation system makes a white print in combination with CMYK possible.

Large rubber transport rolls and stretching rolls guarantee the smooth transport of the media over the vacuum printing plate. The transport also offers easy loading with a minimum media waste when media is changed (max. 40 cm/16 in.).
The printed media is rolled up automatically and controlled by a tension control device on a take up roll. A specially designed and optional availabe Media Loading Cart allows the loading of heavy rolls by a single person.

Viscosity, surface tension, UV light absorption and UV lamp wave length are balanced with each other in a way that the optimal curing and adhesion on most variations of material is guaranteed.

Durst offers 2 system inks:
1. 3M UV Premium Ink for 3M Scotchprint® Applications
2. Rho Roll ink - the most flexible UV ink on the market for flexible material such as blue back paper, foils, canvas and vinyls with reduced odour for indoor used media;
3. Rho cationic ink – odourless and most environmentally-friendly offers the highest density (up to 2,4 d) and is usable for uncoated PVC, PP, PE and a wide gamut of other roll materials.

For more than 2 years Durst has delivered white pigmented ink, proven in more than 100 installed devices. Durst’s design makes the white pigmented ink used as background, spot color, filler, or as front surface covering color on inverse transparent prints.

All job preparation actions are done on an external prep/RIP-station, which allows ripping, nesting, batch processing, color correction and a variety of other controls.
The machine also offers a backlit mode, which automatically applies double the amount of ink in one pass for applications requiring this desired density.

The basic version with 8 Quadro Heads can be upgrade to a 16 Head model, and a standard CMYK-version additionally equipped with 2 Spot colors.