Benefits of the hottest high-pressure cleaning and

Editor's note: through this article, we can find that the industrial high-pressure cleaner can improve the quality of printed matter and prolong the service life of high-pressure wire by making templates (screen printing plates) and recycling silk

every silk printing factory I visited uses different kinds of high-pressure cleaners in the process of producing and recycling silk. These machines can be equipped with a variety of configurations according to needs, and as more and more manufacturers move their production bases to areas with lower costs, the price of these machines has also decreased significantly in recent years. Everyone can go to the local supermarket to buy such equipment, but can it really play a certain role? More importantly, what do you hope the industrial high-pressure cleaner can do for you

high pressure cleaner has different functions in different stages. Now, I'd like to introduce some principles for the successful selection and use of high-pressure cleaners and the correct handling of silk

some seemingly simple measures can actually help you save a lot of plate making time and silk cleaner. But before choosing the process of silk plate making, you should know exactly what is high-pressure cleaning

the linewaterpressure in the United States is usually 75psi. Gathering this water in a nozzle can increase its pressure, but its new increment in 2018 mainly comes from the 10000 ton phase I project of Qinghai lithium resources company, which is no higher than 200psi, so it can't be said to be high-pressure water

line water pressure is usually used to clean the image area on the exposure plate. Many screen printing plate manufacturers believe that the use of low-pressure water can protect the delicate image details on the printing plate from damage. But this is an illusion. If the silk can be properly dried, imaged and rehydrated, it will not be damaged by high-pressure water in the final cleaning process. We'll talk about this later

the price of general hardware and pressure washers sold in gardener stores are relatively cheap, ranging from $100 to $300, and their operating pressure is between psi. Of course, this is better than no pressure at all, but in practical work, their pressure is still lacking, and their scope of use should be limited. In addition, these devices are designed for temporary use, and their rated workload is relatively low. If they are only used to clean images, they can meet the requirements, but it is difficult to use them to prepare and recycle objects

you need a cleaner with a pressure above 1000PSI to handle live parts. I think the most suitable pressure range is psi. Such a high pressure requires an engine of 5 to 10 horses to drive. These industrial cleaners are designed for continuous operation of more than 4 hours. Their cost is between 400 and 4000 dollars. The specific price mainly depends on the working pressure, working cycle (how long the unit can operate without shutdown before it has to rest), and the specification of the motor used

eye preparation

we should start with tightening the eyes on the silk plate. During the first round of preparation, imaging and recovery, the original target is very unstable, and its tension often changes. In addition, different engine oils and silicones used in the weaving process may also remain on the eye. The correct way is to remove these pollutants before treating and coating the silk printing plate with emulsifier. The way you deal with the screen printing plate directly affects the service life of the target and the tension of the silk

for those screen printing plates that use stretch and glue racks, the stability of the eye tension will be directly affected by the high-pressure cleaner. The eye tension can only drop when gluing. When people first studied eye tension in the 1980s, researchers believed that the decline of eye tension after tension was caused by a phenomenon called "cold flow". This is a process in which polymer molecules are arranged along the direction of the tension vector. In the process of arrangement, they slide past each other, thus reducing the overall tension. This phenomenon is the biggest difficulty people face in the process of using the retainable rack. Only by constantly adjusting the eye tension can people maintain a stable target value

the development of high-density low modulus polyester polymer can significantly improve the problem of tension drop, but it can not completely solve this problem. A study conducted by the University of Wales in the 1990s showed that the mesh tension could not be averagely transferred to the silk production capacity of 10million square meters last year. In fact, researchers found steering friction at the intersection of lines, which imaged the transfer of pressure to the wire. Only with the help of time or additional mechanical force can the eye tension remain stable and consistent

when you use a high-pressure cleaner to clean the screen printing plate for the first time, its tension may drop by 10 to 15N/cm. Water pressure higher than 2400psi will open the nodes of the line and lubricate the line, causing the line to slide and the tension to drop. You can find the same problem in the first 150 prints of the new template printing. The continuous non-contact fatigue cycle will also cause the same problem of node looseness, resulting in a significant reduction in tension

after high-pressure cleaning and anti-wear treatment, you should adjust the final wire tension. Our company has greatly improved the production performance of the original project through this method. You can reduce the tension drop in the printing process by more than 80% through high-pressure washing, adjusting the eye pressure to the target value, and lubrication. If you use a static rack, you can't calibrate it, and you can only watch the tension drop

production of templates

our company has recently changed the way of wire cleaning, significantly improving the quality of high-density templates and reducing moire fringes on halftone patterns. Like many silk printing plants, we also live under high pressure, because we must be extra careful when cleaning exposed images - we have very strict requirements for the preparation of silk, the environment of the silk printing workshop and the exposure system used

now, let's soak the exposed silk in water for two minutes or more to make the unexposed area undergo better rehydration reaction. We also use spray to clean the silk and further remove the unexposed resin on the template. When cleaning the printing surface, we use 500PSI pressure

the changes we made to the template making process have greatly improved the sharpness of image edges, template connections and images. The line water pressure does not have enough force to enter the edge area of fine target nodes or circular points. We are now working hard to solve these problems and improve the quality of printed matter

the reduction of moire fringes is the most obvious progress. Proper cleaning can help us get the ideal halftone point, and can easily remove the unexposed emulsifier. Bio based chemical fibers need to break through the manufacturing coating of key equipment

recycling

high pressure cleaning plays an important role in the process of silk recycling and ghost removal. Some printing houses think that the pressure of 3000psi is too high in the process of silk recycling, which will damage the silk. They point out that oil cleaner and template remover will soften or destroy the emulsion layer. Their idea is correct, but these products are the basis of the whole production process, not just a part of the workflow

in the recycling process, high-pressure water can be used to remove the ink and emulsifier on the target node. This can make the eyes more emotional. The greater the original printing tension, the better the printing effect

another problem I often hear is that high pressure can tear eyes. Silk may break during recycling, but high-pressure cleaning is not the main reason for its fracture. With the decrease of mesh tension, the possibility of wire breakage will increase. Low tension silk is more elastic, like that on a trampoline. When you use high-pressure water to wash the low tension wire, the eye will quickly rebound under the pressure of water. This will cause the target to vibrate and cause the wire to break. On the other hand, the elasticity of high tension wire (25n/cm or even greater) is relatively small, so high-pressure washing can effectively remove ghosting on this kind of template

in order to reduce the chance of breakage of silk in the recycling process, it is best to clean it from the bottom of the silk at least 12 inches away from the mesh. The cleaning roller can only be removed when the top of the washer is 1 to 2 inches away from the wire surface. Finally, keep cleaning the silk until all the patterns are removed

the combination of high eye tension and high water pressure can prolong the service life of the wire, improve the quality of the image and reduce the appearance of moire fringes. In this way, you can also get more benefits from stable printing pressure and fewer ghosting failures

source: must win