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Advanced Drying System | UV Varnish Roller Coater | Slimcure (Space Saving UV Curing System) | UV Curing

 
Product Introduction

This Latest Generation of UV, and UV - IR, or UV - Hot Air - IR Combination Curing Equipments from Hansa is evolved, designed and developed indigenously to suit Indian conditions. Innovative Engineering and State-of-the-Art Manufacturing Techniques make our products the first choice amongst leading organizations and clients. These curing systems have been widely accepted as practical, efficient and speedy solutions for drying and curing of light sensitive coatings on all families of substrates, whether rigid or flexible.

Advantages of UV Curing

Listed below are a few key advantages of UV Curing as against other conventional drying solutions:

• Faster Drying of Conventional Inks - Rapid curing can be achieved at ambient temperatures thereby shortening production time, in other words achieving a higher productivity.

• Solvent Free Ink & Varnish - UV curable materials do not contain solvents; therefore, they do not release residues or noxious gases into the environment. Thus, UV curing process is environment-friendly.

• Energy Saving - UV curing consumes only 20% of the energy needed for conventional drying process.

• Space Saving - UV curing systems are usually smaller in size than their conventional counterparts.

• Spot Varnishing - Spot varnishing capability of UV curing systems lends to the cured output a high gloss finish. The result of this is not only brighter images, but also a scratch resistant end product.

• Agility & Adaptability - UV curing systems can cope with UV curable inks, lacquers, adhesives or epoxy coatings; hence, are very agile and adaptable.

• Modular & Customizable -  The dryer range is truly modular, with each individual module being capable of working independent of the others. Besides, the exact configuration & specifications can be as per the clients’ individual requirements. Hence, users of UV curing systems can rest assured that they can acquire a system that meets their needs just right, thereby justifying every single penny that you have invested in buying it.  

Operational Procedure

The coating of UV varnish or UV ink can be through an offset press (through dampening duct for varnish) or a varnish coater, or through Hansa's five roller graphic coater. If the paper quality is poor and there is porosity in the paper the first operation involved in UV curing process is coating of water-based varnish and drying with hot air and IR radiation due to which porosity of the paper is filled up and a uniform surface is achieved. Next comes the UV varnishing and drying. Since the boards are already coated with water-based varnish, a reduction in coating thickness of UV varnish is feasible. The coating thickness of UV varnish can be reduced to different extents, depending upon the quality of paper used. Straightaway coating of UV varnish can also be done, thereby saving considerable processing time.

 
TYPE OF EQUIPMENTS

Hansa's Product Range includes,

• UV Curing Equipment

• UV - Hot Air Curing Equipment

• UV - IR Curing Equipment

• UV - Hot Air - IR Curing Equipment

• UV / IR Modules

• Roller Coater (UV Graphic Coat)

How the UV, Hot Air, and IR modules work in tandem to achieve the desired result?

INFRARED [IR]

 Infrared (IR) is a part of the electromagnetic spectrum with a wave length of 1.1 to 1.6 microns and lies just beyond red colour of visible light. Infrared radiation is invisible. However, it has properties similar to light i.e., it travels at the speed of light; it can be directed or focused and it can travel even in vacuum. When IR radiation is absorbed by an object, heat is generated internally in the object as IR radiation causes atoms of the object to vibrate, raising their temperature (temperature of any substance is a measure of the severity of vibrations of its atoms). The best known  drying procedure to-date is infrared radiation drying with short-wave spectrum. Conventional inks are used in conjunction with IR drying. By heating up the ink (or coating) a reduction in viscosity is achieved considerably improving the ink absorption, especially on absorbent substrates.

HOT AIR

The application of heat (IR radiation) drives the water to the surface and evaporates part of it. Thermo - air slit nozzles direct a high volume of air against the direction of travel of the web or sheet at high speed and brings it right up against the surface of the material being printed. This results in damp air being exchanged for dry, warm air, promoting drying of the dispersion coatings.

ULTRAVIOLET [UV]

A condition for using this drying system is usage of UV-reactive inks and coatings. It is not the acceleration of a chemical process (oxidation), as with IR drying, which is involved here, but polymerization triggered by UV radiation. The chains of molecules present in the inks and coatings are stimulated suddenly to polymerize (cross-link) by photo initiators which react to UV radiation.
 

The UV lamps used in the equipment is from a world famous manufacturer in Germany. The reflectors too, are imported from Germany. These reflectors have a unique feature in that the secondary reflectors send UV energy away from the lamps, reducing heat build-up near the lamps, thereby, extending its life. Further, the secondary reflectors can be easily replaced.

This latest generation UV / IR / HOT-AIR combination is used first for coating of water based varnish and drying with hot air and IR. This application will fill the porosity of the paper and a uniform surface finish is achieved. The second operation is the UV varnish drying.

Since the boards are already coated with water based varnish, the coating thickness of UV varnish can be reduced. Straightaway coating of UV varnish is also feasible, thereby saving considerable time and process.

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Advanced Drying System | UV Varnish Roller Coater | Slimcure (Space Saving UV Curing System) | UV Curing