1. The printing film can not be replaced by laser print draft or sulfuric acid paper draft. It must be a positive or negative positive film output by a professional manufacturer. Each time you output, you must output one more blank film with positioning crosshairs. When printing, first fix the blank cross-hair film on the glass plate with transparent tape, and other color films should be based on this, so that the position of the screen can be kept consistent.
2. For fine screen production, high-resolution imported photosensitive glue and high-tension and low-stretching imported screen must be selected.
3. The printing ink should use high-gloss, friction-resistant organic glass ink, especially matte ink when printing on the surface, because this ink is not resistant to friction and the color is not gorgeous.
4. Screen printing color matching is generally carried out based on the experience of the screen printing master. Because the number of screen meshes used in each batch of orders is different, the thickness of the photosensitive film is also different, which often causes the color cast of the printed product, "the ink color in the barrel" No, I will see the true face after scraping on the page" which explains this truth. Therefore, each batch of orders must be printed out with the printed screen for trial printing, and the customer can confirm that the color is consistent with the original before entering the formal printing.
5. Large-format paintings must be printed with a screen printing machine, and small-format paintings can be printed with suction pads. During the printing process, six consistency should be maintained:
①The screen spacing of multi-color screens should be consistent;
②The printing speed should be the same;
③The printing pressure should be the same;
④ Keep the ink consistency consistent;
⑤The hardness of the large and small scrapers is the same when printing by hand;
⑥ Maintain the same temperature and humidity in the printing workshop.
There is often a lot of static electricity and dust on the surface of the Printed Acrylic Stand. If the dust adheres to the screen, it will cause the text and color blocks to be incomplete and waste products. Therefore, printing must be carried out in a clean and dust-free room. The surface dust can be removed in two steps. First, wipe off the surface dust with a damp cotton cloth, and then use an electrostatic dust removal brush or dust removal roller to remove the remaining dust. When printing, check while printing. If any problems are found, clean the screen in time before printing.
It is common for steel plate leveling machine equipment to fail. As long as the cause is found and solved in time, it will not have a big impact. In view of this, we must have an understanding of the causes of common machine failures so that we can deal with them calmly. So today, let's talk about the problems related to the leveling machine.
For a leveler, vibration marks and bubbles are a headache. Among them, there are many reasons for the occurrence of vibration marks, such as inaccurate calibration of the zero position, inappropriate depth of the straightening roller, and tilting of the equipment. The most likely one is the wrong depth of the fine straightening roller. For this reason, the continuous residual stress on the strip steel is used to reduce, so that the plate shape is restored to normal.
If there are bubbles, it may be due to the deoxidation of the leveler, such as the overheating of molten steel, and the bubbles will appear only when it comes into contact with water in the air during the two oxidation processes. Therefore, the steel should be controlled when it is dissolved, so as to prevent the generation of bubbles. So when we choose a leveler, we must look for high-quality products, so as not to affect the subsequent use performance
1. The transmission device is the same as the frequency converter (circulation control) and can be synchronized with the punching machine for balanced feeding. Two-stage leveling. During the coil leveling process, (both ends-tail end), there is no need to adjust the leveling in the middle, which can ensure the same flatness. Due to the different curvatures of the materials, a single straightening roll arrangement cannot meet the requirements of high-precision straightening. The STL series originally adopts large row pitch rough straightening, small row pitch fine straightening, and different layout straightening concepts. Coarse straightening makes the coil produce a single curved arc and then corrects it with fine straightening, so as to meet the customer's requirements for stamping. The leveling wheels and straightening auxiliary wheels of this machine are made of imported SUJ2 and heat treated HRC60. Post-grinding, then hard chromium plating and post-grinding processing to ensure the uniformity of the hard chromium layer and the shape tolerance of each shaft. The coarse and fine leveling adjustment of this machine adopts a floating four-point balance fine-tuning device, with a dial indicator, which can quickly find the leveling point. This machine adopts universal joint transmission and full gear transmission, which is suitable for those with high straightening accuracy requirements. product. The whole machine adopts high-precision bearings, and is equipped with a lubrication system, which has a long service life. The whole machine is very durable and will not cause any harm to the product.
2. The upper and lower auxiliary rollers are fixed, which improves the rigidity of the upper and lower wheels and prevents deformation under force. A steel plate leveling machine with high precision, high speed and long service life suitable for the leveling of thin plate materials. As we all know, it is impossible to produce a good product without the coil material being leveled and stress relieved. Therefore, the performance of the steel plate leveling machine plays a key role in the production. The leveling adjustment of the precision steel plate leveling machine adopts a floating four-point balance fine-tuning device with a dial indicator to quickly find the leveling point. The steel plate leveling machine adopts universal joint transmission and triple gear full transmission, which is suitable for products with high straightening accuracy requirements. Steel plate leveling machine's leveling wheel and straightening auxiliary wheel are all made of imported SUJ2, heat-treated HRC60. Post-grinding, then hard chromium plating and post-grinding processing to ensure the uniformity of the hard chromium layer and the shape tolerance of each shaft.
3. In addition to the straightening roll, the addition of the guide wheel has a rolling effect on the material to further improve the accuracy. The whole machine adopts high-precision bearings and is equipped with a lubrication system to prolong its service life. Each leveling wheel of the steel plate leveling machine is equipped with a leveling auxiliary wheel to ensure that it will not bend and deform during the production process, thereby improving the flatness quality of the product. The upper and lower auxiliary rollers are fixed, which improves the rigidity of the upper and lower wheels and prevents deformation under force. The three-overlap plus transmission mechanism adopts synchronous and independent transmission of each leveling roller to reduce the transmission due to a single gear group.
All indicators of PPR pipes are better than those of radical drainage pipes. PPR pipes are a new type of environmentally friendly pipes, which represent the development direction of drainage pipes in the future. Of course, the difficulty in the development of PPR pipes is not the overall production scale, but the promotion of manufacturing technology and the promotion of application technology. Enterprises should pay attention to the technical content of products and the development of applied technology. It is recommended to take sheltering measures for outdoor laying in places exposed to sunlight. The pipeline summer device can be slightly serpentine laid. In winter, buried drainage pipes do not need to reserve pipe lengths. If the operating space is too small, an electrofusion connection method should be used. When the PPR pipe is installed, the heating temperature should not be too high. When the hot-melt socket is connected, the temperature should be controlled at about 210 degrees, otherwise it will cause too much squeeze out of the fittings and reduce the inner diameter of the water; When the pipe fittings or pipe joints should be clean. At the same time, pay attention to control the angle and direction of the pipe fittings to prevent rework. The pipe fittings adopt compression molding and hot-melt extrusion welding process, and the reinforced polypropylene PPR pipe adopts extrusion molding. After the size meets the requirements, it can be welded with the reinforced polypropylene PPR pipe. Molded flanges and pipe end flanges must be contoured and must comply with this standard. The unevenness of the sealing surface of the raised face flange connection end should be less than 0.3 mm, and the outer diameter, wall thickness and geometric dimensions of the polypropylene pipe and pipe fittings should be enhanced.
The pipe end of the PPR pipe is processed into threads, using nominal threaded pipe fittings, wrapped with PTFE tape, and then screwed on to ensure sealing, and can be sealed and welded according to specific requirements. PPR pipe requires the welding surface of the two pipe ends to be flat, and the pipe fittings are welded by hot melt extrusion. The center is aligned and the axis is the same to ensure that the two welding surfaces are in close contact during welding. Welders must pass the examination before they can work. The wall thickness of the pipe fittings, flanges and pipe end flanges should be the same as the wall thickness series of the pipe. When pipes are welded to pipe fittings, flanges and pipe end flanges. Asbestos rubber gaskets or soft rubber gaskets should be used according to the properties of the media.
When pipes and pipe fittings are connected by flanges. The voltage is required to be around 220 volts, and the interface should be aligned when docking, and when connecting with hot melt. Otherwise, it will cause insufficient butt joint area, insufficient weld strength, and improper crimping; when the heating plate is heated, the pipe interface must be cleaned; the heating time must be controlled appropriately. The large-caliber PPR pipe is extruded and molded with high-quality glass fiber reinforced polypropylene. Adhering to the excellent corrosion resistance of polypropylene, the pipe overcomes the shortcomings of polypropylene's low mechanical strength. It has the characteristics of high mechanical strength, good wear resistance, low interest, long service life, convenient installation, etc., and it has become one of the anti-corrosion pipe materials in petroleum, chlor-alkali, chemical fiber, pesticide, light industry, sewage disposal and other industries.
The distance between polymer molecules increases when the polymer is heated in a viscous flow state. The mobility of the macromolecular chain is enhanced, and the center of gravity of the entire molecule is shifted to produce flow. Under the action of external force, the entire macromolecular chain slides and deforms, causing the long molecular chain molecules to overlap and entangle again. Because this deformation is irreversible, the temperature is reduced and the external force is removed, the long chain macromolecules can still persist in this way. Reorganization state, this is the process principle of ppr pipe welding.
Pillow packaging machines are indispensable in today's life. No matter what product is packaged, pillow packing machines are indispensable. There are many types of pillow packing machines, large selection and strong pertinence. The following is a brief analysis of what needs to be paid attention to in the daily maintenance of the pillow packing machine. After the production is completed, the maintenance of the machine will often be reduced. In the normal production process, the maintenance work of each machine must be done by the maintenance staff. According to the maintenance manual and maintenance procedures of the machine packaging equipment, the maintenance work shall be strictly performed within the specified period to reduce the wear rate of the parts and eliminate the production. The hidden danger of failure, prolong the service life of the machine.
The key to the maintenance of the pillow packing machine is: cleaning, tightening, adjustment, lubrication, and corrosion protection, which are roughly divided into routine maintenance, seasonal maintenance and out-of-service maintenance.
First: Routine maintenance.
The first-level maintenance work is carried out on the basis of routine maintenance. The key work content is lubrication, tightening and inspection of the relevant parts of the automatic packaging machine and its cleaning.
The secondary maintenance work focuses on inspection and adjustment. Specifically check the engine, clutch, transmission, transmission components, steering and braking components.
The focus of the three-level maintenance work is to detect, adjust, eliminate hidden troubles and balance the degree of wear of each component. It is necessary to perform diagnostic testing and state inspection on the parts that affect the performance of the pillow packing machine and the parts with fault signs, and then complete the necessary replacement, adjustment and troubleshooting. 
Second: Seasonal maintenance.
It means that the pillow packing machine should focus on the inspection and repair of the fuel system, hydraulic system, cooling system and starting system before summer and winter.
Third: stop maintenance.
It means that when the pillow packing machine needs to be out of service for a period of time due to seasonal factors (such as winter holiday), etc., cleaning, plastic surgery, matching, and anti-corrosion should be done.