Chemical method can be a variety of problems existing in the three-dimensional objects on the painting, including spraying and flow coating. But these technologies have to be low viscosity paints, and in most cases, this is a 100 percent UV curing system, the request can not be easily reached. Under normal circumstances, therefore, need to add a small amount of organic solvent to meet the requirements of low viscosity. However, the actual operation might not ideal, but manufacturers have not paid attention to this issue for those who have the potential end-users is an insurmountable problem chemicals. The reason why manufacturers UV curing coating processes to attract, this is because the finished product after processing demonstrated by the excellent performance, as well as in the production of a series of advantages:
Improved abrasion resistance
With high-gloss surface, can improve the texture of metal or other special modification effect
Paint curing faster speed (a decrease of surface contamination)
Higher production capacity
A smaller space
Of course, can be 100% curable and can be spray or flow coating of UV curable coatings manufacturers struggle is the ultimate goal. Today, there are several liquid coatings to meet these requirements, of course, is a UV powder coating curing system to achieve 100 percent of the way. UV curing can also be mixed heat-curing coating is also an option, especially for those who object to the existence of the shadow of the existing regional or hot-curing oven on the situation to carry out any modification. Among them, the production line in the heat-curing additional UV curing device, can significantly increase the production speed and quality of paint. Although the company does not sell Fusion UV ultraviolet curing coating, but we and many chemical formula linked to the company, so we can recommend a series of requirements can provide you with paint company.
□ UV lamps with different design, shape and size, angle and bending, and the convex edge of the situation of three-dimensional parts curing need all the light projected onto the surface, and should have enough energy. General lighting and reflection from the lamp cover of the Reflector for gathering directional beam projected onto the object, the reflective shield is generally oval-shaped or parabolic. The use of the Oval Reflector, the tube placed in an oval on the first focus, lighting in the second focus on the formation of the narrow focus of the high irradiance beam. However, due to divergence of light, deviated from this point, to quickly lower the irradiance. The use of parabolic lampshade, in a wide range of ultra-violet light beam can be parallel, but low irradiance and can be added to the shadow of three-dimensional objects. Many industrial painting three-dimensional objects in need curing "optical thick" paint, which is a high rate of UV absorption coatings. However, UV-ray energy density across the coating will rapidly reduce the curing severely disadvantaged. In order to ensure full curing, coating the bottom of the need to fully light. And the thick coating contains a large number of pigments and additives, but also not conducive to transparency. Only the use of high UV radiation can only be achieved thorough curing. Painting only when the base plate, you can use the elliptical reflector enclosures, the maximum radiation Regional (that is the focus) to focus on coating. However, for three-dimensional objects curing, but much more difficult to achieve. The use of a compact modular lighting system that can track objects or exposure to outline some specific areas. Powered lights on the microwave cavity to amend an oval face, you can change the focus of light, so the focus farther away from the light side, so that surface wider focus. While this will reduce the radiation-degree peak, but they can make more uniform intensity of light, light from more distant places where they can get enough radiation, while maintaining fat accumulation and the advantages of astigmatism, a decrease of the shadow appears. See Table 1 in the results. Table 1 - Comparison of radiosity peak (unit: watts / square cm), 240 watts for the lighting / cm (600 watts / feet) away from light and objects: Reflector Type
50mm 100mm 150mm standard elliptical Reflector 2.45 0.46 0.14 amended Elliptic Reflector 1.63 0.65 0.21 □ engineering solutions UV curing three-dimensional objects of design engineering solution depends primarily on the following key factors: the object's overall size and Shape: including surface type, the need for curing the corner may be the shadow, as well as production line items to cover a possible overlap between the regional delivery of objects: including object orientation, placement and exposure, for example: a single curing or bulk curing is hanging or gripping Exposure Exposure is the revolving exposure or fixed exposure. Production rate or production: including start-up time and space constraints. Paint exposure requirements: including irradiance, spectral range, exposure time, as well as physical strength required to achieve the required technical conditions infrared exposure. UV radiation energy and irradiance: including the number of lamp, lamp power, lamp position, these factors determine whether or not to accept the coating uniformity of the greatest possible exposure to ensure that the object reached the end-use requirements. To meet technical requirements, the need for the installation of equipment and processing to design a flexible program. Following is a range of UV curing equipment installation design classic example. Installation design
Application of fixed stent may be one-way movement of modular lighting
Polycarbonate headlight lens devices with rotating one-way movement of the modular lamp
Powder Coatings Painting engine robot carrying an object to be solidified, while the lamps fixed object
TV, stereo sound small complex parts UV lamps fixed on the robot
A large number of plastic display box and a framework for robot fixed in the lamp, but also fixed lamps
SMC (Sheet Molding Compound) body panels sealing layer □ the use of robots will be fixed on the robot lamps for curing very favorable. When the production line object shape and size vary, so do not have access to a group of fixed lamps to achieve all-round exposure, the robot can be very good to complete, and most obvious effect, it can easily be exposed to those fixed lamps unable to cover the "dead ends." However, the use of robots, there were some problems need attention. First of all, the lamps must be sufficiently strong, can afford to live robotic arm in the acceleration and deceleration time of the swing, and the lamps must also be in different locations and reliable able to work effectively. In addition, the robot operator needs to confirm there is enough room to let the robot move to cover all regions. Finally, the robot can be programmed procedures must ensure that exposure to all objects, but also the right projection of light energy. For example, when spraying is controlled by the robot, the robot should be able to maintain a strictly curing system synchronization. □ the shadow of the region to deal with even taking into account the curing system during the installation process and objects in the installation process of all the factors, there would still be some regions are not exposed to ultraviolet light, which can not be realized fully curable.
At present, is considering the use of mixed-curing (UV / heat) to solve this problem. Among them, the heat-curing the second-curing, to ensure that the shadow of the region were completely curable. This approach does not detract from the advantages of UV curing, but in most cases it is not difficult to achieve. And 100 percent by thermal curing methods, being developed the hybrid system is much lower baking temperatures, baking time is short.
In addition, the objects in the UV exposure can be the means to carry out the full touch-dry, so as to preserve the UV curing of low-pollution probability advantage. Of course, the hybrid system also retains the 100 percent UV curing method has performance advantages of those, such as scratch-resistant, resistant to cutting and scratch-resistant and so on.
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