The fuser film sleeve is a vulnerable part of the fuser. Basically, it may be accidentally damaged or worn after printing tens of thousands of sheets. The surface of the Fuser film sleeve does not stick to powder, and can conduct electricity and heat conduction. Let’s take a look at the performance of Fuser film sleeve.

Thermal conductivity:
A Fuser film sleeve with poor thermal conductivity will not only cause the toner to not be firmly fixed on the media, but also turn the partially softened toner onto the Fuser film sleeve or the lower roller, or even agglomerate, damaging the heating components.
There are several ways to characterize the fixing fastness. One way is the method in the Ministry of Machinery Industry Standards, which uses abrasion tester to test, but this method is more difficult for users without conditions. ; Another method is relatively simple, that is, wipe with paper towels or absorbent cotton, but this method is very relevant to the tester and lacks comparability.
The fixability of the Fuser film sleeve is very important for the matching relationship with the lower roller, toner, and media. Qualified lower rolls should have appropriate softness and hardness, fast resilience and other properties. The toner should also have a suitable softening point and permeability. Therefore, when customers have problems with fixing when using Fuser film sleeve, including sticking powder, they should communicate with customers more to see if there is a problem with the matching.
Isolation performance:
The Fuser film sleeve with good isolation will transfer the toner to the printing medium without distortion. At the same time, there will be no residual toner on the Fuser film sleeve, and keep the Fuser film sleeve working well for a long time without ghosting.
The quality of the isolation performance has a great relationship with the coating materials used on the Fuser film sleeve and the production process.
Flexibility:
A good Fuser film sleeve should have proper stiffness. Generally speaking, the stiffness of the Fuser film sleeve on the high-speed machine is higher than that of the Fuser film sleeve on the low-speed machine. The Fuser film sleeve on the hp4000 series models is hard. Use one end of the Fuser film sleeve to tap the concrete floor or wooden table. The Fuser film sleeve on the high-speed machine will make a metal-like sound, while the Fuser on the low-speed machine will sound like a metal. The sound of the film sleeve is much dull. Fuser film sleeves with insufficient stiffness tend to make a "cracking" noise when rotating on the machine, while Fuser film sleeves with good stiffness make a very small "sand" noise. Fuser film sleeves that are too low are prone to wrinkles during use, and uneven printing occurs when black images are printed. However, if the Fuser film sleeve is too high, it is easy to cause difficulty in heat conduction and decrease the fixing firmness.
Tear resistance:
Tear resistance is another important mechanical performance index of Fuser film sleeve. Fuser film sleeves with insufficient tear resistance are prone to tearing when the machine is not working properly, such as paper jams or foreign objects entering the fixing assembly. .
Apparent performance:
The apparent performance plays a very important role in the use of Fuser film sleeve. Common apparent defects include:
(1) Severe uneven thickness. If it is uneven thickness along the circumferential direction, it will cause insufficient fixation in areas that are too thick, and areas that are too thin will be easily damaged; if it is uneven thickness along the direction of the generatrix, it will cause Fuser film sleeve flies to the thick side of the film body, causing damage to the Fuser film sleeve;
(2) The smoothness of the surface coating is not enough. If there are a lot of orange peel lines, the adhesion between the Fuser film sleeve and the lower roller is not good, which will cause the fixation firmness to decline, and the quality of fine graphics and text printing will decline.
(3) Apparent adhesion particles, pits, pinholes, missing coatings, serious creases, this kind of defects are slightly larger in size, so the corresponding position of the printed product will cause transfer failure or Defects of weak fixation.
Abrasion resistance:
When other conditions are met, the wear resistance is the most important factor that determines the life of the Fuser film sleeve. The abrasion resistance test includes actual printing and simulated printing.
In the actual printing situation, the life of the same model Fuser film sleeve will be affected by many factors, such as toner, temperature fluctuations, printing environment (dust, humidity), paper and so on. At the same time, the fluctuation of process parameters has a great influence on the wear resistance of Fuser film sleeve. Therefore, Fuser film sleeves from the same manufacturer will appear, and different customers will have different reactions.
The consistency of simulated printing will be much better, but the correlation between simulated printing and actual printing is indeed a big problem. For example, whether there is the influence of toner, new paper and old paper, the influence of temperature control and so on.