Carbide and PTFE composite coating for rolls and cylinders that is easy and light to doctor. TecnoClean prevents dirt, dust, fluff, sticky build-up and wear.
PTFE coating is used in dryers, felt and paper guide rolls, swivel and cooling cylinders, spreader and fly rolls and especially to solve problems with vacuum rolls.
With TecnoClean coating, paper releases easily, meaning that there is less need for draw, there is no dust and the paper quality and profile are excellent. Our coating also makes the useful life of the drying wire longer. The coating on the roll and cylinder keeps them clean and ensures they conduct heat well, resulting in increased drying capacity and efficient energy use. The coating is easy and light to doctor, leading to further energy savings. The coating is extremely durable and lasts for more than 10 years. It also lengthens the operating life of the doctor blade. TecnoClean is the ideal coating for application on site without removing the roll.
Work description and duration
A cylinder that is in bad repair must first be ground smooth. Grinding repairs all problems: it removes dirt, rust and scuff marks, cleans the surface and gives the cylinder the right shape. After this pretreatment, the actual coating is applied by base-coating the steel or other metal with carbide using the HVOF or HVAF method of thermal spraying. This is followed by a PTFE coating, and together these form a durable and dirt resistant composite coating. If necessary, the cylinder can be balanced after this. The lead time for a five-metre-long cylinder, for example, is about 36 hours.
- hardness of the base coating 1200 +/- 50 HV
- thickness 100–150 µm
- operating temperature 20–200 °C