Advantages of sleeve technology The sleeve technology has many advantages, which can be summarized as the following points. 1. The sleeve is light in weight and easy to load and unload. The sleeve can be easily replaced manually, which greatly reduces the labor intensity of the operator and can meet the needs of printing manufacturers for fast, flexible and personalized production. 2. By using sleeves with different thicknesses, the required printing circumference can be changed. That is to say, with only one specification of the air support roller, the main can meet the needs of different printing circumferences in a large range, with a high The flexibility, such as sleeves with wall thicknesses of 10mm and 70mm, respectively, differs by nearly 400mm in printing circumference. 3. The sleeve covers a small area and is easy to store. It is manufactured using special processes and materials, with high precision and long service life. The rapid development of flexographic printing technology has led to the advancement of many new processes and technologies. Sleeve technology is one of them. This technology has been favored by users since its birth, and its application has become more and more widely. Judging from the situation, the sleeve technology will continue to maintain a good development trend. At home, you may be familiar with the two companies Rotec and LASERLIFE. They are the world's famous manufacturers and manufacturers of flexographic printing sleeve products. The printing factory provides a large number of high-quality sleeve products and perfect technical services, and has a high reputation in the industry. Why is sleeve technology so popular? What is the charm of its space? 4. The use of the sleeve system can reduce production and transportation costs, and the cost is low. It is precisely because of the outstanding advantages of sleeve technology, it has been favored by the majority of flexographic printing plants since its introduction, and has greatly promoted the rapid development of flexographic printing technology. Classification and use of sleeve According to the different uses of the sleeve, it can be divided into plate sleeve, seamless plate sleeve, joint sleeve and anilox sleeve. 1. Mounting sleeve The plate mounting sleeve is specially used for mounting photosensitive resin printing plate. This type of sleeve is easy to mount and dismount, easy to store and low in cost. According to the different surface materials, the plate mounting sleeves can be divided into hard surface sleeves and soft elastic surface sleeves. (1) Hard surface sleeve Hard surface sleeve, such as Rotec's Blue-Light sleeve, the surface layer of this sleeve is a precisely processed hard polymer, very hard, with high hardness, impact resistance and cutting resistance, etc., you need to use foam Mounting tape mounts the printing plate on the sleeve. The hard surface sleeve is mainly used for thick plate (1.7mm ~ 7mm) printing. Suitable substrate materials include kraft paper, cardboard, paper bags and soft boxes, etc. It is not suitable for printing high-quality and fine products. (2) Soft elastic surface sleeve The surface material of the soft elastic surface sleeve is an elastic, compressible polyurethane foam, which has good compression performance and a variety of hardness to choose from. You can choose the appropriate hardness set according to the specific type of the plate material and the printing material cylinder. The soft elastic surface sleeve is specially designed and produced for CTP technology and high-quality thin-plate flexo printing. It is necessary to use high-viscosity thin (0.1mm thick) plate-mounting tape to paste the plate. The soft elastic surface layer not only has good toughness and high processing accuracy, but also has high compressibility and can absorb vibration. Therefore, the combination application of the soft elastic sleeve and the thin plate can print fine high-gloss dots, and the dots The increase rate is small, suitable for the printing of high-quality, fine products, such as bar codes, thin lines, mesh pattern, etc., and the printing quality and printing effect are very good. The advantages of the soft elastic surface sleeve are mainly manifested in the following aspects. ①Standardize flexographic printing, no longer have to worry about what kind of tape or pad combination to use to paste the printing plate. ② It can meet the requirements of screen printing and field printing at the same time, that is, it can print high-gloss small dots and solid color blocks on the same printing plate at the same time. ③ Can effectively control the increase of dots, so that the printing quality is significantly improved. ④ It can reduce the abrasion of the printing plate and prolong the service life of the printing plate. ⑤It has high resilience and shock absorption performance, even in the high-speed printing process, it can quickly restore the original shape to avoid vibration. 2. Seamless plate sleeve The seamless printing plate sleeve is also called a sleeve type printing plate. It is a seamless printing plate directly carved on the sleeve, which is somewhat similar to a gravure cylinder. With the development of computer-to-plate technology and laser engraving technology, the application of seamless plate sleeves is becoming more and more common. At present, many domestic flexographic printing manufacturers are using seamless plate sleeves. The seamless plate sleeve can complete the printing of continuous patterns or products of the same background color, such as wrapping paper, tipping paper for cigarette filters, wallpaper, etc. In addition, if such a seamless plate sleeve is not imaged, it can be used for coating, full plate glazing, and solid area printing. The seamless printing plate sleeve is mainly composed of an inner layer, an intermediate layer and a surface layer. The inner material of the sleeve is mainly made of special multi-layer glass fiber (GFK), which has the advantages of light weight, low rotational inertia and high bending strength. It can also ensure smooth rotation under high-speed printing. The middle layer of the sleeve is composed of special polyurethane rubber, which has high elasticity and compressibility. The compressibility of the middle layer has a great influence on the structure and performance of the sleeve. It can not only increase the wall thickness of the sleeve , Can also absorb the tensile deformation produced by the sleeve. In the printing process, it is precisely because of the compressibility of the middle layer that the smooth running of the sleeve is ensured, thereby obtaining good printing quality. The surface layer of the sleeve is mainly composed of hard polymers covered with rubber or synthetic materials. 3. Joint (Adaptor) sleeve As an intermediate between the air support roller and the plate sleeve, the main function of the joint sleeve is to increase the diameter of the cylinder or air support roller. The joint sleeve also has a compressible layer, which has an inflation hole like an air support roller. The printing machine is connected to two air pumps, one of which inflates the air support roller, and the other air pump inflates the joint sleeve. When replacing the sleeve, it is not necessary to remove the joint sleeve from the air support roller. 4. Anilox roller sleeve The anilox sleeve was produced about seven or eight years ago, a little later than the plate sleeve, and it has only been widely known in the past two years. It is precisely because of seeing the advantages of the plate sleeve that it is light and fast, for the same original intention and purpose, the anilox roll manufacturer has also begun to try to develop the anilox roll sleeve. Most of the inner layer of the anilox roller sleeve is made of compressible material. The compressibility of the inner layer can be used to install and fix the anilox roller sleeve on the bearing of the printing machine. This compressible inner layer is through air To control. The intermediate layer of the anilox roller sleeve is made of composite material, such as glass fiber or carbon fiber. The surface layer of the anilox roller sleeve is covered with a shell sheath made of metal aluminum or metal nickel, the purpose is to absorb the centrifugal force, protect the ceramic layer and prevent cracks. Processing accuracy of sleeve In the processing of the sleeve, the most important and critical link should be accurate post-processing, to ensure that the various indicators are controlled within the specified error range. In particular, the anilox roller sleeve must be in constant contact with the doctor blade. It must ensure coaxial operation. For the anilox roller, even if it is only slightly uneven or pitted, it will also cause the service life of the doctor blade and the sleeve Adverse effects. In general, the higher the number of screen lines of the anilox roller, the thinner the mesh wall is, the more sensitive it is to the force of the mechanism, and the more obvious the accuracy effect is. In addition, the cylindricity, concentricity and circumference error are also very important for the sleeve, so it is necessary to process the sleeve as accurately as possible. It is worth noting that since there may be some deformation after the sleeve is removed, when measuring the error of the sleeve, the sleeve should be installed on the air support roller. It is best to let it stand for 5 minutes to ensure that all The compressed air is discharged, and the measurement is performed after the sleeve and the air support roller are gradually adapted and stabilized, so that truly accurate sleeve error measurement data can be obtained. 1. Diameter size and error The sleeve must have a precise diameter, which is the most basic requirement. In general, the diameter tolerance of the sleeve is ± 0.001 inches. In addition, in order for the sleeve to be tightly held with the air support roller of the printing machine when expanding and contracting, the inner diameter of the sleeve must be slightly smaller than the outer diameter size of the air support roller of the printing machine. The error is generally controlled within 0.0015 inches, that is to say, the inner diameter of the sleeve is 0.0015 inches smaller than the outer diameter of the air support roller of the printing machine, so as to ensure that the sleeve is firmly and tightly sleeved on the air support roller of the printing machine . 2. Concentricity Concentricity is a very important spatial tolerance index that all anilox rolls have. It represents the deviation between the sleeve and the absolute central axis when the sleeve is rotating. This is a dynamic balance indicator on one side of the sleeve. If the runout error cannot be eliminated, the sleeve will have inconsistencies in the circumferential direction. Once it exceeds the allowable tolerance range, it is likely that streaks or ink sticks will be produced on the printed product during the printing process on the machine. The concentricity error of the sleeve is generally controlled within 0.001 inches. 3. Cylindricity Cylindricity is also very important for sleeves. Cylindricity tolerance of anilox roller sleeves is generally controlled within 0.0005 inches. It must be pointed out that the above data must be measured at both ends and in the middle of the sleeve. Sleeve installation and removal The sleeve is generally installed on the gas support roller. The gas support roller is a matching device for sleeve application, and its appearance is similar to the plate roller. There is an air inlet hole at one end of the air support roller. From this air inlet hole, compressed air can be filled into the air cavity of the air support roller. In addition, some small exhaust holes are distributed on the surface of the air support roller. The exhaust holes and the intake holes are continuous, and the compressed air charged through the intake holes can be evenly released from these small exhaust holes. In other words, when compressed air is filled from the air inlet of the air support roller, the compressed air will be evenly discharged from the air outlet of the air support roller, forming an air cushion layer on the surface of the air support roller, so that the sleeve The inner diameter of the expansion expands and floats on the air cushion layer, so that the sleeve can arbitrarily slide back and forth on the air support roller, so that the sleeve can be installed, unloaded or replaced, even on a wide-format flexo printing machine The sleeve can be replaced very conveniently. After installing the sleeve, turn off the air pump or cut off the compressed air, the air between the air support roller and the sleeve is released, the sleeve will shrink and cover the surface of the air support roller, and finally with the air support roller Tightly and seamlessly integrated into one. Precautions for use 1. The surface of the sleeve must be kept clean and free of dust, solvent or dry ink sticks. These impurities may gradually penetrate into the inside of the sleeve, causing corrosion or damage to the compressible layer in the middle, causing its resilience and The compressibility is reduced, and it will eventually have an adverse effect on print quality. 2. Be sure to choose the appropriate method to clean the sleeve to avoid damage to the sleeve material. For example, the anilox roller sleeve can not be cleaned by ultrasonic or chemical cleaning, nor by sodium hydroxide solution, otherwise the elastic compressible material of the sleeve will be deformed, and the original shape cannot be restored and maintained . In addition, because the surface layer of the anilox roller sleeve uses metallic aluminum as the coating layer, some cleaning fluid may cause damage to the aluminum. Therefore, these problems must be considered when selecting the cleaning method and cleaning solvent. 3. The material of the compression layer of the sleeve must be protected, and it must not be allowed to contact or be stained with organic solvents, cutting fluids, grinding fluids, polishing fluids, etc. to prevent its deformation and ensure that the state of the sleeve is always maintained. 4. When installing the sleeve or removing the sleeve from the air support roller, sometimes the operator may twist or rotate the sleeve slightly. Be careful not to move too much or too fast, otherwise it will deflect the sleeve, or even Damage to the sleeve. 5. In order to prevent the sleeve from being deformed or damaged, it is best to store the sleeve on a special bracket, and do not leave the sleeve casually! In particular, the anilox roller sleeve should pay attention to this point, otherwise it is easy to cause chipping of the ceramic at both ends. A small piece of chipping will form a small crack. When the sleeve is installed on the bearing of the printing machine, the small crack It will get bigger and bigger, and eventually the net sleeve will be scrapped. Conclusion All in all, the production and development of sleeve technology has provided great advantages and conveniences to the majority of flexographic printers, and has adapted and promoted the development of modern flexographic printing technologies. At present, many flexographic printing companies have adopted sleeve technology. It can be said that the application of sleeve technology has become the development trend of flexographic printing. I believe that sleeve technology will achieve greater development in the near future. Let us Wait and see. Baby High Chair,Baby Safety Chair,High Chair For Baby,Baby Table Chair Zhejiang Lamon Technology Inc. , https://www.chairesbaby.com