13.09.2014
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Warranties do not cover products damaged through misuse or improper installation, operation, or modifications. This warranty does not cover product damaged during shipping - other terms and conditions may apply. AZ sales tax is collected on purchases within AZ unless buyer provides a valid AZ Sales Tax Exemption Certificate pre-payment. UV LED is a new light source that radiates ultraviolet rays and replaces conventional UV lamps for curing, exposure and sterilization. LG Innotek has succeeded in the world’s first mass production of 6-inch wafer for increasing performance and maximizing optical power of UV LED.
Printing processes have drastically evolved over the years, originating in the form of labor-intensive manual printing presses and advancing to modern day offset, flexography, digital and 3D printers.
Until recent years, UV LEDs have been faced with a number of technical and economic barriers that have prevented wide commercial adoption. While the adoption of LEDs into consumer devices and applications such as televisions, electronics, displays and lighting has been prolific, this uptake has been predominantly in the longer wavelength spectrum of visible light or infrared. As with most new technologies, acquisition costs tend to be greatest in the early stages of product availability and decline as mass market adoption occurs. Despite much of LED development and adoption being focused on visible light, the growing market, increasing commercial use of LED and investment into the technology itself have helped to drastically improve the cost landscape for UV LEDs as well.
While the upfront capital investment in a UV LED curing system for printers may be higher than that for a conventional lamp-based solution, the gap in expenditure has narrowed significantly in the past few years, making the payback period much shorter.
Arguably one of the areas under the most scrutiny for UV LED technology is the efficiency and maximum radiant power that is produced. Irradiance is inversely proportional to the junction temperature of the LED die, thus maintaining a cooler die not only extends life and improves reliability, it also increases efficiency and output. The components of LED arrays, thermal management and optics all work together, as optimizing one piece often impacts the others.
The challenges of packaging UV LEDs into arrays have been overcome, as there are a number of solutions available today for various applications. Depending on the application and the inks that are used, often 395nm wavelength solutions can adequately cure formulations at a more economical system cost than 365nm alternatives. Table 1 is an overview of the typical output to input power efficiency of LEDs at various wavelengths. UV LED curing systems typically are composed of an LED head, power supply and interconnect cables.
Cooling of discrete UV LEDs does not present a particularly difficult engineering challenge. Water cooling is an extremely efficient method of extracting heat, particularly in applications where high power densities are required over large curing areas. UV LED systems can use optics to provide benefits for specific applications, such as those requiring longer working distances and a narrower, more focused illumination area. A wide range of applications can take advantage of the many benefits that UV LEDs bring, from spot curing to small and large area curing requirements for a range of industries. For instance, in UV label printing, wide-format digital, flexography or 3D printing, air- or water-cooled LED configurations can be used without costs being prohibitive.
However, in high speed printing processes that require large scale curing systems with extremely high optical output, the economics of attaining a cost competitive solution using LEDs is an area that is still being optimized. The gaps that previously existed between traditional lamp solutions and UV LED-based curing systems certainly have been narrowed. Pamela Lee is senior product manager of OmniCure® UV curing solutions at Excelitas Technologies Corporation.
SLA (Stereolitography) 3D printers rely on liquid resin that is being solidified with the help of UV light (Laser, LED or DLP light source), however when the finished print is ready to be removed from the build plate it still needs some more work. We have experimented with different sources of UV light to see if we can easily cure 3D printed parts on our new XYZprinting Nobel 1.0 SLA 3D printer. 2KW 265mm UV Lamp for Wood Curing, View UV lamp, xupurui Product Details from Zhuozhou Xupurui Lighting Source Manufacture Co., Ltd.
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Its high-performance UV LED packages, applied vertical chip technologies, LG Innotek secured the leadership in the UV LED market. While a number of different printing technologies are available, printing with UV inks is a fast growing sector, and UV LEDs are becoming the light source for curing UV inks in many printing applications. High cost and limited availability of LEDs, low output and efficiency, and thermal management challenges, combined with ink compatibility were factors that prohibited market adoption.
Until recently, UV LEDs have experienced a more modest adoption because of a number of commercial and technological challenges. While the LED components themselves contribute most of the total system cost for UV-LED installations, the implementation and efficiency of designs also dictates how well the produced radiant energy is delivered to the working surface.
Efficiency and yields have been on the rise while costs have come down – by more than a factor of 10 in the past decade. With growing demand and further advancements in process and technology, the overall cost of UV LEDs will continue to be on the decline. Figure 2 illustrates the lifetime of LEDs at different junction temperatures and the relative output. The effective use of optics, for example, will allow light to be projected more efficiently, thus reducing thermal load, increasing irradiance at longer working distances, reducing the number of LEDs required and, as a consequence, lowering cost. Both small and larger area UV LED curing systems are available with different wavelength offering, including but not limited to, 365nm, 385nm and 395nm. However, as more processes begin to adopt UV LED curing, the commercial drive has pushed formulators to tailor products with photoinitiators, resins and additives packages that function efficiently with LED emission wavelengths and thus are more effectively cured without any compromise on the quality of cure.
Piecing these components together to create a viable solution is a challenge, with the bulk of engineering development being focused on the UV head design. However, creating a solution using LED arrays that can meet commercial needs is a demanding and technically complex task. Low junction temperatures can be more easily obtained with this technique and, consequently, higher efficiency, longer lifetime and great reliability are the end result.
Since air is inherently less effective at extracting heat than water, special design considerations must be made to enhance airflow, as well as to pack the LEDs and optimize the curing solution by employing the use of optics. Through the use of optics, the energy from LEDs can be delivered better to the substrate or ink.
The irradiance levels of an LED solution utilizing optics are maintained at longer working distances when compared to a solution that does not employ optics.
Optics also can be designed for flexibility, allowing systems to be joined to create larger illumination areas while maintaining the same uniformity between the units. However, depending on the print application, the practicality of implementing UV LED solutions may vary. In digital UV inkjet printing, the flexibility and customization that can be afforded with the technology has driven growth in this segment. The technological advances that have been realized in the past few years have enabled cost reductions, higher output and efficiency and better thermal performance and system design. Whether it is performance, cost or availability of formulations that are compatible with UV LEDs, the technology has unquestionably made considerable advances to allow UV LED curing solutions to become commercially viable.
She holds an MBA and Bachelor of Science degree in electrical engineering from the University of Toronto, has authored several publications and has presented at a number of industry-related speaking engagements. The first step is to clean it up with the help of stong alcohol that will remove any liquid residues from the resin, then you might need to remove some support material if you needed it. We’ve started with a 3W UV LED lamp from a flashlight, but that was simply not powerful enough an even after an hour the test parts were still not cured well enough.
If the item comes direct from a manufacturer, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag. Find out more about your rights as a buyer - opens in a new window or tab and exceptions - opens in a new window or tab. With 50, 000 hours of use, this piano lacquer finish professional light offers powerful 48W bulbs and also switches to 24W usage for UV gels. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable.
Authorization for PayPal acceptance when the item is being shipped to outside of the US is at our discretion. The UV-A (315~400nm) range is applied to diverse applications, including industrial applications such as UV curing, exposure, printing ink hardening, counterfeit detection, photo catalyst and specialty illumination for aquarium, agriculture etc., whereas the UV-B (280~315nm) range is used for medical purposes and the UV-C (200~280nm) range is applied to products for air or water purification, and sterilization.
With advancements in UV LED technology, utilization of UV LEDs for curing in printing processes has become increasingly prominent in the market. Some of these barriers included high cost, low output power and efficiency, as well as thermal management challenges.
For instance, the better the implementation of optics and cooling, the fewer LEDs will be required.


This all has contributed to wider adoption, increased volumes and increased support for UV LED compatible inks and materials available for the marketplace.
High power systems are created by grouping arrays of LED die together, increasing both the packing density and, in principle, the radiated power.
A good implementation of UV LED systems requires expertise in each area and an understanding that each piece is interwoven to work as a system. As mentioned previously, high power systems are created by densely populating LED die in arrays.
Performance, space and system size constraints, noise, environmental conditions and ease of integration are factors that dictate the design of a solution. Another advantage of water cooling is the compact UV LED head size, permitting integration into applications where space around the curing area is limited. The benefits air cooled systems bring are the ease of integration, being light weight and reducing costs, with no need for external chillers, tubing or coolant. Different methodologies ranging from reflection to focusing light with lensing can be employed to enhance the output and minimize loss of energy.
By providing high output and custom optics to deliver high irradiance at flexible working distances, UV LED curing systems enable users to increase productivity by maximizing the use of UV energy. Taking into consideration the type of print process, required throughputs and print area, the use of UV LED curing systems may be a viable option, and one that can help overcome many challenges. The ability to have tighter controls on the process results in high quality prints and fast turnaround times. It is anticipated that as the technology continues to mature, more and more processes will adopt UV LED curing solutions. You would notice however that the 3D printed part has a bit of rubbery feel and is not yet like a strong plastic, so it needs to be cured with additional UV light to become strong. Then we have moved to UV lamps for checking for counterfeit money, these are usually available with a 4-8W UV lamps and are pretty easy to find, but unfortunately they were still not powerful enough. There are several technological advances that have enabled the use of UV LEDs for ink curing, as well as specific advantages UV LEDs bring to printing processes. Significant progress has been made to address these shortfalls and, as such, has helped advance the acceptance and viability of UV LEDs as a curing solution.
However, in practice, there are limitations to the packaging as a higher packing density results in a greater power per area (an increased irradiance), but with that must also come the handling of an increased heat density and power consumption.
Thermal management has become a crucial technological component in UV LED advancements and will be further discussed in this article. The complexity in the packaging of arrays alone is one aspect, but these arrays must also be housed, driven, cooled and optimized. As outlined above, the performance, reliability and lifetime of LEDs, particularly those in high density and high output arrays, are dependent on how effectively the heat is dissipated.
While in its infancy, air cooled solutions could be utilized only for low output UV applications. Depending on the application, optics can be customized to meet the performance requirements, including working distance and curing area. One of the most common and easy ways to do it is to bring out the 3D printed part outside so the sun can shine on it and cure it in a few minutes, however this is not the best way to do it and the sun is not always available when you need it to provide enough UV light.
So the next step was a string of UV LED lights where we got about 8W of power per meter and this meant that we needed quite a long strip to get more power out of them and we have moved to looking for alternatives. The compact, light-weight body makes the dryer ideal for all salon environments, designed to fit in professional nail tables and counters. According to market research from Yole Developpement, "the UV LED business is expected to grow from $45M in 2012 to nearly $270M by 2017," with majority of this being accounted for by UV curing. The performance of the die is better at longer wavelengths, thus cost per watt output is lower while delivering more energy. The roles that thermal management and optics play in a system design are profound, as they help dictate the efficiency, form factor and implementation. High peak irradiance and delivering sufficient energy density are necessities in UV curing.
The need for chillers and water pipes requires extra infrastructure that some applications or print environments cannot afford. However, in recent years, considerable advancements have been made, such that higher power air cooling implementations can be achieved without negatively impacting lifetime and reliability.
In many cases we are able to solve problems without requiring the return of the unit for repair.
Thermal management is often overlooked but plays a crucial component in the successful execution of a design to achieve the required performance parameters.
Having a window or flood that illuminates onto a wide area for such a process would mean the majority of energy is wasted. It uses four 9W CCFL UV lamps and apparently provides enough UV light in order to cure most 3D printer parts in just a few minutes. There are currently two implementations of thermal management – water and air cooling. It has worked really well with the clear resin prints from the Nobel 1.0 SLA 3D printer and there is enough space to fit inside relatively large objects. When we handle returns, defective items will be replaced with the same or similar product depending on stock availability. LED irradiance can be very high at the emitting window but decreases with distance because, without optics, the light is diffused and unfocused.
If you need more space you should be able to pretty easily modify the standard plastic box and make a larger size box with some aluminum foil. To mitigate the effects of an increased working distance, employing optics to focus the UV light helps to optimize the output and results in a more efficient solution.



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