In the film industry, cast film is a type of non-stretched and non-oriented flat extrusion film that is produced by rapidly cooling the melt during the casting process. There are two production methods: single-layer casting and multi-layer co-extrusion casting. Compared to blown film, it features fast production speeds, high yields, as well as excellent film transparency, gloss, and thickness uniformity.
Cast films possess outstanding heat sealing properties and remarkable transparency. They are among the most crucial base materials for packaging laminates and are utilized in the production of high-temperature retortable film, vacuum-aluminized film, etc. The market outlook for cast films is quite promising. Moreover, with the development of domestic cast film production equipment, some of its technical indicators have reached a high level. Consequently, the entry threshold for cast film production is becoming lower and lower.
Precisely due to this reason, certain companies, aiming for the highest possible quality grades without fully considering market demands and return on investment, are hastily importing cast film production lines. Such an approach will lead to a substantial waste of resources.
(1) Domestic cast film production lines can be categorized according to the width of the film, such as 2500mm, 3000mm, 3500mm, and 5000mm. Based on the configuration of the extruder, they can be divided into three-layer, five-layer, and seven-layer types.
(2) A domestic cast film production line mainly comprises five parts: the extrusion part, the casting part, the corona treatment part, the winding part, and the electrical control part. Among them, the casting part and the extrusion part can be freely combined based on customers' requirements, aiming to meet the diverse demands of customers (the market) to the greatest extent possible.
(3) Additionally, the design of domestic equipment closely aligns with the international advanced level. For instance:
A. The unique design of the rear unit enables the pressure of the extruder to be freely adjusted.
B. The unique design of the screw flow channel allows it to be compatible with different materials, making it a multi-purpose machine.
C. The flow channel design of the rollers ensures better cooling effects, more stable product quality, and higher output.
D. The linear speed of domestic cast film production lines has reached the range of 160m/min - 250m/min.
(4) Compared with imported equipment, domestic cast film production lines also exhibit the characteristics of high speed, stable performance, environmental protection, and energy conservation. The thickness of the products varies from 0.017mm to 0.08mm (calculated based on the international standard of 0.025mm).
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