Application of GNOSS Automatic Melt Filter in Film Extrusion Process _ Production _ Variation _ Thickness

Original Title: Application of GNOSS Automatic Melt Filter in Film Extrusion Process Due to the increasing market demand for thin films, the production process of thin films is becoming more and more complex in order to ensure the provision of high-quality thin film products. In addition to the use of special extruders, dies and winding machines, melt filters are also crucial in the configuration of production equipment. A fully automatic melt filter is used to filter out contaminants such as gel particles and minimize the appearance of "black spots" or "fish eyes". In addition, the use of fully automatic continuous melt filters can avoid downtime and reduce waste of raw materials. Product in kind: Gnoss Automatic Rotary Melt Filter With the patented rotary filtration technology, the gneuß fully automatic melt filter is the highest standard of melt filters on the market today, with impeccable product quality, cost-effectiveness, ease of operation and maintenance. The automatic melt filter consists of three main parts-inlet block, outlet block and filter disc. The filter screen is distributed in the annular part of the filter disc. When the melt flows through the filter screen, the pollutant particles are intercepted and the pressure difference is slightly increased. By sensing the pressure change, the control system automatically rotates the filter disc to make it rise by 1-2 degrees. The dirty screen leaves the melt channel while the clean screen is fed into the melt channel with the effective filter area unchanged. As a result of this mode of operation, the filtration system runs continuously without interruption and the pressure remains constant. In the standard case, the maximum variation of the filter differential pressure is only 2 bar. Melt Filter Operation Schematic The following data is from a customer of gneuß. This customer produces PP stretch film. The thickness at the exit was 335 μm, after which the film was stretched to 150 μm. The extrusion line consists of a 90 mm single screw extruder with RSF75 fully automatic melt filter installed downstream of the extruder. The production capacity of the extrusion line is 330 kg/H with 40 μm filter screen. The film is continuously monitored by a thickness measuring device. Expand the full text The graph below shows the percentage of the relative roll width. The left axis shows the absolute film thickness in μm, and the right axis shows the maximum relative deviation from the set value of 335 μm. The base time for the melt filter was set to 180 seconds. Select this time setting so that you can see if the operating cycle of the filtration system has an effect on the membrane thickness. In theory, thin film distillation ,molecular distillation systems, there should be a change every 180 seconds or every 10 measurement intervals. Looking at these values on the graph, you can see that the graph above is marked with I. The film thickness is a maximum absolute deviation of +/-5 μm with an average of +/-3 μm, representing a relative deviation of +/-1.5 or +/-0.9%. Compared to the normal deviation of about +/-0.6% for other factors in the extrusion line, these figures are only minimally improved in the filtration system. Considering that this extrusion line does not have a gear pump installed downstream of the filtration system (which may inhibit pressure variations), these values are very good. To investigate the results, a further test was carried out to measure the change in thickness of the filter element during the production run. The customer changes the screen every 3 months (during which no attention to the melt filtration system is required), and the replacement process takes about 10 minutes. The film thickness during this period is recorded as follows: The filter replacement time (A) can be clearly seen from the figure. During this time, the film thickness increased by at most 5 μm, with a relative deviation of less than 1.6%. Therefore, the amount of film made during this period is fully qualified. Therefore, it can be concluded that the membrane quality can be guaranteed even during the filter replacement. Shanghai Binlian Science and Technology Co., Ltd. is the general agent of German Gnos in China, and is committed to introducing German advanced chemical fiber and plastic production equipment and technology into China. In the context of industrial transformation and upgrading, by adding or replacing key equipment on the production line, such as melt filters, melt pressure sensors, tackifying reactors, etc., product quality and production efficiency can be greatly improved. Why not? Welcome to carry out technical exchanges and program discussions with Binlian Science and Technology. 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