Aluminum Spiral High Speed Door
The Spiral door offers high-speed operation for high-traffic situations and rigid aluminum slat construction that eliminates the need for a second security door. Crisp lines give the Spiral door a stylish look that's great for many types of commercial, automotive retail, government, institutional and industrial applications. The Spiral is ideal for automotive dealerships, government, parking and security. Benefits No metal-to-metal contact reduces wear on the door panel and offers fast, quiet operation.
Aluminum spiral High Speed doors are usually used wherever goods traffic occurs and where the doors have to fulfill special requirements. In the food and beverage industry, or Medical industry for example, special climatic conditions have to prevail; short opening and closing times reduce cooling loss, avoid airflow and enable a smooth operating procedure. They can also be designed in larger dimensions for the mining and aircraft industries.
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Figure 1 UV ink curing schematic
UV inks For traditional inks such as solvent-based inks, water-based inks, and oxidized conjunctiva-type inks, KBA has the advantages of environmental protection, good printing effect, high production efficiency, and low use cost. Especially in recent years, with the rapid development and maturity of UV drying technology, UV inks have been increasingly used in the printing industry, especially on high-grade prints such as cigarette packets, plastic films, and labels.
Ink curing is an extremely important part of the entire printing process and plays a decisive role in the quality of the product. How to determine whether the UV ink is completely cured is a basic skill to grasp the performance of the UV ink. This article will explain the UV ink and its curing method from the following aspects.
The basic composition of UV ink
UV inks are printed digitally in China according to the printing method. They can be divided into UV ink, UV offset ink, UV flexo printing ink, and UV screen printing ink. The ink mainly consists of the following parts.
(1) Prepolymer: It is equivalent to the resin in ordinary ink and determines the printing performance and various test properties of UV ink, such as friction performance and solvent resistance.
(2) Monomer: It mainly adjusts the viscosity of UV ink and improves the flowability of UV ink. It is equivalent to the thinner in common ink. In the UV ink drying process, the monomers provide free radicals to cross-link the prepolymer, and different monomers can affect the UV ink drying speed and the performance of the ink film. Lamination
(3) Photoinitiator: The main role is to absorb ultraviolet energy to form free radicals, excite cross-linking reaction between monomer and prepolymer, and form a stable polymer with network structure. In the UV ink formulation, the ink manufacturer chooses a variety of photoinitiators for use in an ink depending on the different absorption properties of the photoinitiator.
(4) Pigment: It mainly determines the color of UV ink. Varnish does not need to add pigment.
(5) Additives: include leveling agents, surfactants, defoamers and other additives to improve the performance of UV inks.
The basic principle of UV ink curing
UV inks are cured by the action of ultraviolet rays. Under the irradiation of ultraviolet rays, the photopolymerization initiator in the UV ink absorbs a photon of a certain wavelength and then converts it into a free state molecule and becomes a radical HP, and then changes the polymerizable prepolymer and the photosensitive monomer through the transfer of intermolecular energy. For the excited state, charge transfer complexes are generated, and the complexes are continuously crosslinked and polymerized to form a film. The UV ink curing process is a process of photochemical reaction screening, that is, under the action of ultraviolet energy, the prepolymer is cured in a very short time. In addition to the surface curing of the UV ink, the UV light penetrates deeper into the liquid UV ink and stimulates further curing of the deep ink film. In traditional inks, oil-based inks are dried under oxidizing conditions, while solvent-based or water-based inks are mainly dried by water or solvent evaporation, and some inks can penetrate the paper. Therefore, compared with the traditional ink, the UV ink polymerization curing is more thorough, without any evaporation or solvent contaminants, 100% ink film curing. UV ink curing principle shown in Figure 1. Shaanxi Beiren
Failure analysis and exclusion
Figure 1 UV ink curing schematic
The basic method to determine the UV ink curing
Combining the characteristics of UV inks, and referring to the traditional ink drying determination method, Esko, the author summarizes the following methods to determine the UV ink curing conditions.
1. Check the ink adhesion after printing or winding
We know that traditional oxidized conjunctival inks, if not thoroughly dried, will stick to each other after they have accumulated or become entangled. In the same way, prints printed with UV inks will also have this problem if they are not cured. So you can use this method to determine the ink curing effect.
2. Thumb compression method
This method is the most convenient and quickest test method for drupa. The basic process is to use a thumb to press firmly on the surface of the cured print, and then squeeze it back and forth several times, if the press is rough or worn, and An ink blot on the thumb surface indicates insufficient ink curing.
3. Nail test
This method is similar to the thumb pressing detergent package. The basic principle is that the UV ink is cured from the surface and gradually enters the interior. If the ink is not fully cured, scratches may occur after scraping with the nail, and the fully cured UV ink will not be scratched to determine if the ink has cured. Print inspection
4. Tape stripping test
Since UV inks are currently widely used on thin film materials or non-absorbent substrates such as aluminized papers, tape testing methods are used to test the ink's binding performance. Taking into account that if the UV ink does not completely cure the intellectual property, it will result in poor adhesion of the ink and the printed material. After the tape test, the ink will be peeled off from the surface of the print by the tape. The amount of ink flaking is related to the type of tape, the peeling speed, and the state of ink curing.
5. Chemical test methods
Many end-users use printing ink resistance to chemical solvent (alcohol) performance as an important aspect of evaluating the print performance of a product. Fully cured UV inks have good chemical resistance, while uncured UV inks have poor chemical resistance. Because the UV ink, which is not cured sufficiently, will have a rigid surface, in fact, the interior of the ink layer still has no solidified packaging stream, is soft, and therefore has poor chemical solvent resistance. In addition, acetone is also very suitable for testing the degree of curing of UV inks by wiping it with a cloth impregnated with acetone. If the RFID is cured poorly, the coating will be dissolved.
6. Other methods Packaging design
The German Printing Association (FOGRA) recommends several test devices for checking the resistance of UV inks to peeling and sticking resistance. Tests can be carried out according to the German Industrial Standard DIN 16524 and DIN 16525 methods.