a) The design of extrusion systems for multi-layer co-extruded film blow molding equipment should take into account the characteristics of the raw materials.
For the design of multi-layer co-extruded film blowing equipment extrusion systems (screws, heads), the raw materials' density, melt index, viscosity, flowability, processing temperature, thermal sensitivity and other characteristics should be taken into consideration first. Blended composite properties.
B) Configuration of extruders and heads for multi-layer co-extruded film blowing equipment.
Multi-layer co-extruded film blowing equipment head can be equipped with an extruder for each layer of the flow path, or it can be used for flow channels of certain head layer sharing an extruder. For example, a five-layer co-extrusion system can be configured 5 Or 4, 3 extruders. The former can realize the extrusion of a different raw material for each layer of the flow channel. The formulation of the raw materials can be flexibly changed, which is beneficial to the combination of thin film functionalities. Meanwhile, the interlayer thickness of the thin film can be conveniently adjusted, and expensive raw materials can be saved. However, there are many extruders. The cost of equipment is high; although the latter can be equipped with fewer extruders and lower equipment costs, it can only be used for the production of thin film products with little structural changes. Despite the low cost of equipment, it is difficult to save the use of expensive raw materials. There are few ways.
C) Main types and applications of screws.
Screws are mainly in the form of barriers, separations, pins, corrugations, etc. Crystallized and non-crystalline plastics, heat-sensitive and non-thermosensitive plastics, screw structure are all different. The length and diameter ratio of the screw, depth of screw groove, compression ratio, length of each functional segment, positioning of the solid-liquid phase groove, etc., are directly related to the plasticization, performance, output and energy consumption of the film. In fact, raw materials with different characteristics should be processed with different structural screws in order to obtain the best processing results. Processing of polyolefins can use barriers, separations, pin screws, PP processing can be used to separate the screw, PA and EVOH processing can be wave-shaped screw. However, many factories need to change the processing materials frequently. Frequent replacement of screws for the processing of different materials is a very troublesome task. Only “compatible†screws can be designed to accommodate the processing of several different plastics (for example, LLPDE, LDPE, HDPE, EVA-processed screw and screw that can be used to process PE, PA, EVOH, and PP at the same time. Although the "compatible" screw can't get the best processing effect of some raw materials, it can also meet certain processing requirements.
For the design of multi-layer co-extruded film blowing equipment extrusion systems (screws, heads), the raw materials' density, melt index, viscosity, flowability, processing temperature, thermal sensitivity and other characteristics should be taken into consideration first. Blended composite properties.
B) Configuration of extruders and heads for multi-layer co-extruded film blowing equipment.
Multi-layer co-extruded film blowing equipment head can be equipped with an extruder for each layer of the flow path, or it can be used for flow channels of certain head layer sharing an extruder. For example, a five-layer co-extrusion system can be configured 5 Or 4, 3 extruders. The former can realize the extrusion of a different raw material for each layer of the flow channel. The formulation of the raw materials can be flexibly changed, which is beneficial to the combination of thin film functionalities. Meanwhile, the interlayer thickness of the thin film can be conveniently adjusted, and expensive raw materials can be saved. However, there are many extruders. The cost of equipment is high; although the latter can be equipped with fewer extruders and lower equipment costs, it can only be used for the production of thin film products with little structural changes. Despite the low cost of equipment, it is difficult to save the use of expensive raw materials. There are few ways.
C) Main types and applications of screws.
Screws are mainly in the form of barriers, separations, pins, corrugations, etc. Crystallized and non-crystalline plastics, heat-sensitive and non-thermosensitive plastics, screw structure are all different. The length and diameter ratio of the screw, depth of screw groove, compression ratio, length of each functional segment, positioning of the solid-liquid phase groove, etc., are directly related to the plasticization, performance, output and energy consumption of the film. In fact, raw materials with different characteristics should be processed with different structural screws in order to obtain the best processing results. Processing of polyolefins can use barriers, separations, pin screws, PP processing can be used to separate the screw, PA and EVOH processing can be wave-shaped screw. However, many factories need to change the processing materials frequently. Frequent replacement of screws for the processing of different materials is a very troublesome task. Only “compatible†screws can be designed to accommodate the processing of several different plastics (for example, LLPDE, LDPE, HDPE, EVA-processed screw and screw that can be used to process PE, PA, EVOH, and PP at the same time. Although the "compatible" screw can't get the best processing effect of some raw materials, it can also meet certain processing requirements.
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