Adjusting slit coating die can improve productivity
Release time:2022-12-26
It can fine-tune the uniformity of horizontal coating thickness distribution. The slit coating die can be used to eliminate the visible coating strip caused by the thick coating by adjusting the coating die lip, and correct or eliminate the phenomenon that the middle thickness is thin and both sides are thin during the coating process of high viscosity coating glue. Break the upper limit of the viscosity of the coating glue, and reduce the cost of raw materials by keeping the coating accuracy within a small tolerance range.
The reason for this adjustability is that the adjustable die lip adjustment system of the die head is composed of several independent adjustment blocks arranged along the width direction of the die head. The coating die head is equipped with a thickness adjustment system, and these die lip adjustment units need to be manually adjusted. As an option, the die can also be combined with the automatic thickness adjustment system to achieve closed-loop control. The system uses a thermal expansion adjustment block to respond to the feedback from the downstream coating volume scanner. When the area beyond the target thickness is detected during the coating process, the power of the plug-in heating rod at the corresponding point on the die lip will increase, which will cause the corresponding adjusting block to expand, thus tightening the die lip gap in this area. On the contrary, areas with low thickness can be corrected by reducing power.
Considering the specific use environment and cost factors, we should reasonably select the extrusion die materials according to the needs, and can consider different material combinations.
Cemented carbide is a powder metallurgy product mainly composed of hard phase and bonding phase. The hard phase of the slit coating die head is very hard, mainly composed of various carbides. The main carbides are tungsten carbide (WC), titanium carbide, tantalum carbide and niobium carbide. Cobalt is used as the bonding phase. Japan's TF15 is a tungsten steel hard alloy. The grain size of this material is small, less than 1 μ m. It takes into account hardness and toughness, easy to form sharp edge, high strength of blade tip, and its basic performance parameters. Comparing the precision of the superhard alloy edge with that of the stainless steel edge, the die heads of these two different edge materials are used for coating, and the coating thickness uniformity is also different. The cutting edge is made of cemented carbide with excellent wear resistance, which can achieve long service life and high quality.
The reason for this adjustability is that the adjustable die lip adjustment system of the die head is composed of several independent adjustment blocks arranged along the width direction of the die head. The coating die head is equipped with a thickness adjustment system, and these die lip adjustment units need to be manually adjusted. As an option, the die can also be combined with the automatic thickness adjustment system to achieve closed-loop control. The system uses a thermal expansion adjustment block to respond to the feedback from the downstream coating volume scanner. When the area beyond the target thickness is detected during the coating process, the power of the plug-in heating rod at the corresponding point on the die lip will increase, which will cause the corresponding adjusting block to expand, thus tightening the die lip gap in this area. On the contrary, areas with low thickness can be corrected by reducing power.
Considering the specific use environment and cost factors, we should reasonably select the extrusion die materials according to the needs, and can consider different material combinations.
Cemented carbide is a powder metallurgy product mainly composed of hard phase and bonding phase. The hard phase of the slit coating die head is very hard, mainly composed of various carbides. The main carbides are tungsten carbide (WC), titanium carbide, tantalum carbide and niobium carbide. Cobalt is used as the bonding phase. Japan's TF15 is a tungsten steel hard alloy. The grain size of this material is small, less than 1 μ m. It takes into account hardness and toughness, easy to form sharp edge, high strength of blade tip, and its basic performance parameters. Comparing the precision of the superhard alloy edge with that of the stainless steel edge, the die heads of these two different edge materials are used for coating, and the coating thickness uniformity is also different. The cutting edge is made of cemented carbide with excellent wear resistance, which can achieve long service life and high quality.
