Venous cannula is also a deep venous puncture catheter. The method is to select the appropriate puncture site and insert the needle under the skin, and insert the needle with negative pressure until the dark red blood is absorbed, indicating that the needle has entered the vein, and the guide wire is inserted. Withdraw the puncture needle to leave the guide wire in the blood vessel, and then insert the venous catheter that needs to be indwelled along the guide wire, then exit the guide wire, inject diluted heparin saline and fix the catheter, the deep venous catheterization is completed. The veins for puncture and catheterization are usually selected clinically, including the subclavian vein, internal jugular vein, and femoral vein. After the puncture catheter is indwelled, attention must be paid to the care of the puncture site to avoid infection with thrombus or catheter falling off. venous cannulation,best veins for cannulation,venous cannulation set,venous cannulation technique Yong Yue Medical Technology(Kunshan) Co.,Ltd , https://www.yypcrtube.com
The ink scraper pressure refers to the pressure applied by the ink scraper to the plate roller. The main functions of the ink scraper pressure are two: the first is to scrape the ink outside the mesh pit in the non-image area; the second is to resist the impact of the ink. To prevent ink from flowing out of the knife edge. What is the specific role?
The blade pressure is too small, which makes it easy to produce a fog or a knife line in the non-image area. When the printing speed increases, the plate roller speed increases, the ink line speed brought by the plate roller increases, and the impact force of the ink on the blade increases. This makes it easy to lift the ink scraper, which seriously affects the quality of the printed product. If the blade pressure is too high, the transfer rate of the ink will be lowered, and the plate roller and the blade will be worn a lot.
The size of the ink scraper pressure is determined by its action, namely: P = P1 + P2
P is the pressure P1 required for the doctor blade. The pressure P2 required to scrape the ink outside the pit in the non-texture area is the pressure required to resist the impact of the ink, and the pressure P2 and the blade required to resist the impact of the ink. The pressure angle is related to the linear velocity V of the ink. Namely: P2âˆCOSαV2
Therefore, the larger the pressure angle of the scraper, the smaller the P2 is, the smaller the pressure P required for the ink scraper is. The smaller the printing speed is, the smaller the linear velocity V of the ink is. The smaller the P2 is, the more the pressure P required for the ink scraper is. Smaller, the smaller the blade pressure angle is, the larger the P2 is, the larger the pressure P required for the ink blade; the higher the printing speed, the larger the line speed V of the ink, and the larger the P2, the pressure P required by the ink blade It is also bigger.
In the actual work, according to the above method to adjust the ink scraper, the quality of the corresponding print can be guaranteed. After using the printing machine for a period of time, due to various reasons such as wear and tear, the accuracy of related important parts may be degraded, and the same print quality problem may occur. This requires further analysis and judgment. Therefore, the influence of the ink scraper on the printing quality is eliminated in time, the scrap rate is reduced, the yield is improved, and the production efficiency is improved. I hope you will notice these effects.
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