Uv curing coating pdf

Ams provides multiple led power and control offerings that depend on the production and process requirements intended for the led uv curing system from our highest level gl control system with full segmentation and rich system diagnosis and feedback, to our programmable lc and basic sc control options with automatic or manual control ability. History has proven it a better alternative to solventbased coatings, offering many benefits including no environmental pollutants, no solvents to evaporate, no long drying tunnels, no wasted floor space and no loss of coating volume. Komori huv curing system printing industries of america. The influence of reactive monomers article pdf available in songklanakarin journal of science and technology 332. Combining ultraviolet uv curing with powder technology opens up new opportunities. Uv coating can be applied via most conventional industrial coating applications as well as by silkscreen. Our uv cure primers allow a print receptive surface uncured and remains uv curable after the ink is applied which can potentially form covalent bonds between the ink if uv active and the primer after a uv curing cycle. Uv curing photochemistry electromagnetic radiation.

Uv curable coating used for decorative appearance,colour, gloss protective barrier. The introduction of uv curable powder coatings in the late 90s expanded the use of powder coating from metal to heat sensitive materials such as medium density fiberboard mdf. Coating is converted from a liquid to a solid in a. The first two sections cover the basics of uv curing with. The polymerization mechanism of uv curing can be classified into 3 main types, only 2 of. Two uvcurable coatings were prepared by blending the urethane acrylate oligomer, a reactive monomer 1,6 hexanediol diacrylate hdda or trimethylol. Safe handling guide uveb materials 2017 page 4 of 21 1. In comparison to other technologies, curing with uv energy may be considered a low temperature process, a high. Currently there are two methods to dry or cure ink on press. Cortland street chicago, il 60614 usa 18006211296 7732480099 fax. Uv curing safety manual protection tips and practices for maintaining safe uv curing operations 1229 w.

The main reason for such a rapid technological growth of uv curing is its unique process characteristic, which allow uvcoating to be applied on virtually any substrates, including plastic, metal. Humiseal uv40 uv curable conformal coating technical data sheet. Article pdf available in pigment and resin technology january 2014. Regardless of lamp diameter, end fitting or power requirement, we can provide an exact match or suitable alternative. Uvcurable coating technology provides benefits in terms of good performance, environmental compatibility and processing efficiency. Uv curing coatings are used to increase production speed and improve scratch and solvent resistance. The polymerized cross linked solid coating will have functional andor decorative properties energy sources that are used to cure coatings include electron beam eb, ultraviolet uv or visible light. Uv cured coatings market global industry analysis, size and. Uv40 dual cure acrylated urethane coating technical data. Monomers and oligomers containing acrylate unsaturation are the most commonly utilized in uvebinitiated free radical polymerization due to their. Curing humiseal uv40250 is a highly cross linked coating. The radiation phase with energyrich uv radiation activates the photoinitiators. As mentioned above, uv curing equipment include medium pressure mercury lamps, pulsed xenon lamps, leds and lasers, but this list is not all inclusive radtech international.

Uv curing photochemistry electromagnetic radiation free. Uv process supply, 1229 w cortland street chicago, il 606144805 usa 7732480099 tollfree in the us. Curing behavior of a uvcurable coating based on urethane acrylate. Uv curing provides many advantages such as instant drying, broad formulating range, reduced energy consumption, coating of heat sensitive substrate, high curing rate and low. It can make it clear of curing level by changing uv irradiation intensity. Whether used on their own or in combination, they can impact the curing speed and the final properties such as chemical resistance and adhesion of the cured coating, ink or adhesive. Uv cured coatings use high energy uv lights as sources, which can form coating films via selfpolymerization 14. Uv curing is the process by which ultraviolet light is used to initiate a photochemical reaction that generates a crosslinked network of polymers. The main reason for such a rapid technological growth of uv curing is its unique process characteristic, which allow uv coating to be applied on virtually any substrates, including plastic, metal. Where traditional drying of solvents or crosslinking of powder coatings can take minutes to hours at high. The uv cured coatings has adopted by many industries such as automotive, telecommunications, glass and plastic decorations and graphic arts. Printers guide uveb chemistry and technology by jo ann arceneaux, allnex usa inc. Introduction to the basics of uveb chemistry and formulations.

Only recently has uv cure coating become available for industrial and oem manufacturing use. Uvcurable technology is one of the fastest growing markets in the paint and coating industry. Realizing the benefits of a uv curable coating system in a continual extrusion process means at least an enormous increase in speed of cure, waste reduction. This paper addresses the advantages of uv powder coating and explains the process for mdf. Uv cure coatings have been around as a coating for paper in magazines and brochures and as a clear coating on printed circuit boards for years. Uv led lamps offer significant advantages over traditional uv lamps for wood finishing, including less space, maintenance and downtime which translates into higher productivity rates, less scrap. Uv eb curing units are significantly more energy efficient and compact than thermal drying curing systems that are used with conventional coatings, inks and adhesives.

This lab report compares photoinitiators choices with traditional mercury lamp curing and uv led curing for clear coats as well as pigmented systems. It is a new and innovative technology for dryingcuring inks and coatings on a sheetfed press. Dymax corporation each potential adhesivecoating application and customer will have a unique set of requirements, and for each application there are chemistries that fit well and those that dont fit as well. Uv troubleshooting guide adhesion backing curing dot sharpness emulsification ghosting hickies inkwater balance laser printing, failures misting picking piling plate blinding plate wear roller stripping rubbingscratchingscuffing scumming set off slurring tintingtoning wet trapping. Where traditional drying of solvents or crosslinking of powder coatings can take minutes to hours at high temperature, uv coatings will cure in seconds or less at room temperature. Volume and density determination of uncured and cured coatings have shown that when all formulation and system parameters are utilized, that a volumetric shrinkage of 12 % is achievable in practice. In order to achieve maximum cross linking density, the product must be exposed to the correct spectral output. Photoinitiators are essential to the radiation curing process. Chemical drying with uv uv curing the drying effect is based on polymerization, i.

Liquid forms of uv curing systems are solventfree, require low energy for curing, and are adaptable to most conventional coating methods. If the uv40 coating has been uv cured only and not allowed to undergo any further moisture curing, humiseal stripper 1072 could be used to remove the uvcured film. Liquid forms of uvcuring systems are solventfree, require low energy for curing, and are adaptable to most conventional coating methods. Uv led curing technology is ideally suited for the wood coatings industry for applications such as edge coating, roller coating and digital printing. Uv led curing solutions are being utilized in the coating industry because they offer lower operating costs, enhanced system capabilities due to being a solidstate device, and environmental benefits of safer workplace environment and no hazardous materials. Uv led systems series modules manufacturer from faridabad. Humiseal uv40250 uv curable conformal coating technical. The energy required for crosslinking is supplied via uv radiation. On the other hand, solventfree coatings, such as 100 % uvcurable coatings are di. Curing behavior of a uvcurable coating based on urethane. In comparison to other technologies, curing with uv energy may be considered a low temperature process, a high speed process, and is a solventless process, as cure occurs via direct polymerization rather than. Appropriated polymer and monomer were used as an acid polymer to grant an alkali. Pdf photoinitiators for uv curing key products selection. Pdf curing behavior of a uvcurable coating based on.

Uv curing lamps mercury vapor and exposure metal halide lamps on the market. The following section highlights the advantages of dymax lcms versus. A wide range of systems are available handheld point, spot wand, flood, and line array systems offering maximum flexibility for any application. In 2011, uvebformulated product usage in north america was 120,000 metric tons. The chapter discusses ultraviolet uv coatings technology. Highgloss, uvcured case study powder coating on mdf a one.

It is meant, however, first to introduce the field to the chemist not currently involved heavily in the uv curing industry. The purpose of our work was to compare the mechanical properties of uv curable high solids and uv curable waterbased coatings formulated for wood flooring after uv led. Wood finishing lamps using light instead of heat, the uv curing process has been in existence over 50years. Curing behavior of a uvcurable coating based on urethane acrylate oligomer. Uv curing has now been established as an alternative curing mechanism to thermal hardening,contrary to the past, where it was only considered for the curing on temperature sensitive substrates, like wood, paper and plastics. The dominant chemistry for uv and eb curing is the free radical polymerization of unsaturated monomers and oligomers. The main purposes of a coating are to ensure the desired appearance color or gloss, necessary protection against corrosion, stone chipping, scratches, abrasion, or chemical attacks like red wine, coffee, or mustard on furniture coatings, or acid rain, tree resins, or bird excrements on automotive coatings. Uv technologies technology by covestro covestro ag. And its fast becoming one of the most popular techniques in the paint and coatings industry. Uvv cures the deepest area on most uv visible formulations. Measurement of curing reaction heat of uv curing adhesives.

Additional advantage of uv curing is the fast cure speed. The challenge with three dimensional objects is in reaching the valley regions prone to underexposure while preventing. The two common arrangements for uvcoating application and curing are flat line and chamber. Also uv eb curing is extremely fast almost instantaneous to a few seconds at most. Our uv cure topcoats have excellent water and chemical resistance and have excellent adhesion to films. Matting solventfree uvcurable coatings coatings evonik. Formulating and processing pigmented uv coatings latest. Top tips for getting the most out of your uv curing process. The uv curing is applied to optimize or stabilize complex device structures in various thin film applications. Sep 01, 2017 the two common arrangements for uv coating application and curing are flat line and chamber. Pdf uv curable urethane acrylate coatings formulation. Warming the 1072 solution can increase its effectiveness.

Formulation optimization is necessary to determine the maximum adhesive quality of coating on substrate. For 100 % solid body systems the thickness of the dry coating corresponds to the thickness of the wet coating. At the surface of the coating the combination of physical drying and uv curing will lead to a high resistance. Radiated and conducted heat can distort films in both the x and y directions during the printing process. Uv curable solution acrylic psa with optical clarity. Comprehensive guide to dymax uv lightcuring technology 1. The uv curable coating has advantages compared to thermal curing such as shortened curing time and nonsolvent.

Introduction uvebcuring is a drying technology for coatings, inks and adhesives. Dispense equipment, light curing equipment loctite. The combination of physical drying and uv curing is a second approach. Phoseon has pioneered the use of led technology for uv curing, offering equipment manufacturers a safer, cooler, more reliable and energyefficient uv curing solution. Uv coating machine fully automatic uv coating machine. Extended dwell times and periodic mechanical agitation could be required. The photoinduced polymerization of such coatings will generate a gradient of double bond conversion.

The third component of the ink is unique to uv curing. Two to three coating layers can be applied in a single day and the coating system is ready for sanding immediately after curing. It uses light of a certain wavelength uv or high speed electrons electron beam to give almost instantaneous dry films. Photoinitiators for uv curing key products selection guide 2003 coating effects. Printers guide uveb chemistry and technology uv curing. Selfcuring acrylate resin for uv consumer product printing and coating applications authors. Comprehensive guide to dymax light curing technology lit008. Uses a 400 w uva light that is held 10 to 30 cm away from the substrate chemistry is a monocure technology rcc cure time is minutes at a thickness of 200 microns patent reports the ability to sand the primer after uv curing and the coating has had time to cool. Conventional coating systems with volatile components, including water and solventbased uvcurable coatings, are easy to matte because of their emissionrelated vertical. Summary the measurement is performed using the dsc7020 high sensitivity differential scanning calorimeter and pdc7 uv irradiation unit for curing reaction heat of uv curing type adhesives. Uv curing is adaptable to printing, coating, decorating, stereolithography, and in the assembly of a variety of products and materials.

Therefore, uv dispersions can be used together with pigments. The uv curable psa has advantages over a chemically crosslinkable adhesive, e. The uv coatings have many advantages over the traditional curing and drying methods such as pvc coatings. Uv eb market share 9294% uv eb market share 68% 47 uv cationic curing cycloaliphatic epoxides basic coating properties c u r uv light polyols crosslinking, flexibility epoxyvinyl ether monomers viscosity reduction additives performance fine tuning ph t i iti t p k e d p r o d photoinitiator package cation generation commonly. Uv curing lamps can be based on two types of quite different technology. This is the longest wave strong uv visible uv uv visible wavelength for use in general uv curing. Uvv is a longrange wavelength that works with the newer visible photo initiators in use today. Appropriate choice is therefore essential to achieve the desired results, and tests should. Uv curing of complex three dimensional objects a critical step in establishing whether an object can be successfully cured using uv energy is to determine the possibility of uniform exposure across all surfaces.

Since uv leds emit no infrared energy, recent studies showed that they provide significant advantages compared to conventional uv curing method for wood coating applications. The mini conveyor uv cure system is the workhorse for small production pieces and cures substrates up to six inches wide. Uv led technology drastically reduces energy consumption and significantly reduces workpiece surface temperature. In 2008, a market analysis for the uv coating technology anticipated a world growth between 8% and % on average over the next five to seven years.

Komori huv is a new approach to efficient press operation. The mini conveyor provides intense ultraviolet energy thats ideal for. The material is tackfree after exposure to uv light. Humiseal uv40250 uv curable conformal coating technical data. Preparation of a fast waterbased uv cured polyurethane. Among experts, uv and eb ink curing have been discussed in the same conversation as the terms sustainable, flexible manufacturing, energy efficiency, increased roi, higher quality products, lower greenhouse gas and voc emissions. Uv curing basics advantages uv curing is also known as radiation curing or energy curing.

Uv curable coating technology provides benefits in terms of good performance, environmental compatibility and processing efficiency. Due to the normally high solids content of uv coatingvarnish the surface of the cured film can be extremely reflective and glossy. It utilizes the ultraviolet uv portion of the electromagnetic spectrum, 200400 nanometers figure 1, to physically dry or cure coatings. Pdf the market for ultraviolet curing technology has been growing at. With flat line, the flat or nearly flat objects move down a conveyor under a spray or roller or through a vacuum chamber, then through an oven if necessary to remove solvents or water and finally under an array of uv lamps to bring about the cure.

Uv curing or photopolymerization technique represents a major advance in the development of the coating, adhesive and ink industries kayamanapohan et al. Because uv eb systems emit only very small amounts of volatile organic. The uv curable solution acrylic psa with optical clarity is a onepart adhesive. Heatsensitive materials, such as mdf wood, were the natural product market for the technology because the melting and curing process is done at lower temperatures and uv curing is instantaneous. Fast return to service is a key factor in many projects. The coating actually polymerizes or increases in molecular weight during the curing process. Humiseal uv40 uv curable conformal coating technical data sheet humiseal uv40 is a single component, high solids, uv curable, acrylated polyurethane conformal coating that possesses excellent chemical resistance, surface hardness, flexibility and moisture resistance. Humiseal has modelled the performance of uv40250 using arc and microwave based uv curing equipment. This has already been accomplished, and quite successfully so, in a number of books and publications 111. As our expanded purchasing power lowers our cost, we can offer you competitive pricing on. Also uvebcuring is extremely fast almost instantaneous to a few seconds at most.

Uv cure coatings are cured using ultraviolet lamps, similar to fluorescent lamps found in many homes and office buildings. Uvebcuring units are significantly more energy efficient and compact than thermal dryingcuring systems that are used with conventional coatings, inks and adhesives. Humiseal uv40 uv curable conformal coating technical data. Mercury arc lamp used successfully for decades, and still the predominant lamp type, it produces a broad spectrum of light led lamp a much newer technology, it produces a narrow spectrum of light the output from uv curing lamps based on leds does not appreciably. Huv is a unique alignment between ink and energy to optimize performance. Employing either radical or cationic curing mechanisms, the crosslinking of these coatings is initiated by means of uv light. In this phase the photoinitiators and the binders link up to macromolecules. Because uveb systems emit only very small amounts of volatile organic. The liquid to solid phase change proceeds within a fraction of a second on intense illumination at ambient temperature. Photoinitiators for high performance uv curing applications.