Cots is an important part of the printing press, which has an important impact on the quality of printing products. Cots have different roles in different types of printing presses. How to choose high quality and printing cots is of great significance to improve the production efficiency of the printing plant, meet various production requirements and ensure the printing quality.At present, the printing plant used in the cots, the more common are natural rubber cots, synthetic rubber cots, etc.High polymer polymer material cots with excellent performance have been gradually accepted by enterprises with high quality printing press, and will be more widely used, polyurethane cots is one of them.
Performance characteristics of polyurethane cots:
Polyurethane cots are suitable for all kinds of printing
1. The appearance of the color is bright, the surface of the colloid is fine and smooth, and the colloid material and the core shaft are firmly bonded.Cots size is strictly controlled, size in different temperature and humidity conditions, there will be no great change.It can adapt to the high temperature and humidity environment of the printing workshop in the south and the cold and dry climate conditions in the north.
2. The hardness index of polyurethane cots is broad, from HSA15 to HSD80, which can meet the requirements of different types of printing presses for the hardness of cots.
3. The colloid for polyurethane cots has sufficient surface viscosity, which can ensure that the cots have good ink transfer and ink transfer performance in the printing process, and its good ink-affinity performance can ensure high quality printing.
4. Polyurethane cots have good chemical properties and are suitable for various types of inks and printing methods.For all kinds of ink, embellish solution, cleaning agent in the solvent composition has a special resistance.Polyurethane cots are also suitable for UV ink cots and glazing oil cots, especially for boiling water, diesel oil, gasoline, lubricating oil, kerosene, alcohol and brine solutions have good solvent resistance.But not resistant, and strong acid strong base.
5. The physical properties of polyurethane cots, long-term use of cots will not harden, aging, and tear resistance, good resilience, good wear resistance, so the service life is long, easy to save, long-term storage does not affect the use effect;Can withstand high pressure, high speed, high temperature, high humidity production environment.The results show that the tensile strength and wear resistance of polyurethane cots are 3 times and 5 times of those of natural rubber cots.Compression does not deform, good resilience;The service life of polyurethane cots is more than 1 times that of general cots.
6. Polyurethane cots have excellent hydrophilicity, so they can be used as water and alcohol moistening sy