Introducing a UV-LED drying device for printing that achieves high illuminance and high dosage.

Highest performance of an air-cooling device of its type in the industry

On October 1, Ushio Inc. (Ushio hereafter; head office: Tokyo; President and CEO: Kenji Hamajima) will introduce the "UniJet iIII", a new air-cooling UV-LED drying device for printing as part of its new "UniJet Series" of high-performance drying devices that achieve the highest level of illuminance as well as dosage among any similar devices in the industry.

As the printing industry transitions from printing with oil-based inks to UV printing, conventional light sources for ink hardening are being replaced with LEDs, both to satisfy restrictions on VOCs*1 and environmental restrictions pertaining to reduction of CO2 emissions and elimination of mercury, and replacement is rapidly proceeding in the the ink jet printers used in the digital printing industry.

However, the air-cooling UV-LEDs that have been adopted in ink jet printers are lacking in illuminance and dosage*2 compared to UV lamps, and because of additional attenuation of illuminance that occurs due to issues involving distance from printed media, they have failed to exhibit hardening performance equal to or greater than UV lamps.

Ushio Inc., which has leveraged its accumulated store of optical design technologies, such as lenses and its high-density mounting technology for LEDs, to develop a UV-LED drying device that achieves a 40% increase in dosage compared to the company's previous products, while simultaneously the industry's top energy delivery of 17 W/cm2 is achieved at practical working distance used (5mm), and reducing attenuation even at 15 mm to less than 20%.
As a result, in addition to achieving high illuminance and light integral equivalent to conventional UV lamps, highly uniform irradiation can be applied to print media, making it possible to achieve high productivity and irradiation performance even in situations involving media that are offset, deflected, or of three dimensional form.

Ushio will continue leveraging its expertise in light to contribute to the environment and energy conservation in the printing industry.

This product will be exhibited at JAPAN PACK 2017 (Booth No. 2 G - 10) to be held at Tokyo Big Sight from October 3-6.
*1 VOCs (volatile organic compounds) contained in paints, printing inks, and the like are regarded as one of the agents that cause photochemical smogs by photochemical reaction in the atmosphere, and together with industrial sectors such as the printing industry, we are implementing VOC emission restrictions in accordance with the May 2004 revisions to the air pollution control law.

*2 The amount of light required to cure UV curing ink. Indicates UV intensity × curing time or the amount of light required during the curing time.

■Main Features
(1) Achieves illuminance of 17 W/cm2, the industry's highest level
Delivering 17 W/cm2 at a practical irradiation distance of 5 mm, our unique design realizes the industry’s highest level of illuminance.

(2) Achieves a dosage level greatly exceeding that of previous air-cooling modules. 
Ultra high-density LED mounting and a unique cooling design maximizes performance, resulting in a 40% greater light integral than Ushio’s previous products.
Attainment of a high light integral, the most important element of performance in UV curing, contributes to increased printing productivity and quality

(3) Ushio's proprietary optical design technology provides high performance at practical irradiation distances
Designed to keep illumination attenuation under 20% for irradiated surfaces within the range of 5 to 15 mm that accords with actual conditions, the device achieves highly stable UV irradiation.
Ushio's proprietary optical system assures efficient and highly uniform irradiation of the work surface from each UV-LED. Constant irradiation performance is assured even in cases where the media is offset, deflected, or of an embossed or other 3D nature.

Model i075Ⅲ i150Ⅲ i225Ⅲ i300Ⅲ i375Ⅲ i450Ⅲ i525Ⅲ
Window size (mm) 75*40 150*40 225*40 300*40 375*40 450*40 525*40
Width (mm) 77 152 227 302 377 452 527
Length (mm) 136
Height (mm) 270
Weight (kg) 1.6 3.2 4.8 6.5 8.1 9.7 11.3
Wavelength (nm) 395
Peak illuminance (W/cm2) 17.4(@5㎜)

■Product Image