Plastic extruder domestic problems

Die head: In our country's plastic extruders, both imported and domestic die heads are used more frequently. It is not necessarily that imported ones are better than domestic ones. Because the requirements for imported die heads are very high, they are specially designed according to the fluidity of the material when they are designed and circulated. Imported die heads use high-quality materials and the quality of the products produced is also very good. Using imported die heads does not mean that high-quality films can be produced. High-quality products require the cooperation of the entire line. Now with the improvement of various industries, domestic die head processing equipment has made great progress in materials, heat treatment, and electroplating. In the past ten years, domestic equipment has basically used domestic die heads. In recent years, some products have begun to configure imported die heads, but domestic die heads are still the main ones.
Cold roller: Many people think that the domestic machine cannot start fast because there are problems with the die head and mechanical design. In fact, the roller is also a key problem. The thickness of domestic cast rollers is 18mm, and the thickness of foreign ones is 8mm. The cast film is cold-set suddenly. If it is too thick, it will be too slow to set and it will not start fast. The imported machine is thin, so it starts fast. Now Shicheng is also making cast rollers with a thickness of about 9-10mm. I hope the production line can be accelerated.
Corona: The corona machine does not flatten the film when entering the corona, resulting in uneven corona. The film must be flattened before entering the corona. The hardness of the corona roller liquid silicone is best at 70 degrees. At present, the domestic corona roller is around 65 degrees, which is not hard enough. Therefore, Shicheng Company's liquid rubber roller has reached 70 degrees. The main problem of the reverse corona is also on the rubber roller. The film is not flattened and the hardness of the rubber roller is not enough.
Online synchronization: Many domestic cast film units are synchronized at around 5%. When starting up, the speed is slowly adjusted, and the thickness is uniform, but there is a lot of waste. In fact, the main problem is the electrical design and the selection of the reducer. Now Shicheng Company has improved it, and the synchronization is around 0.1%, and it will also start faster and faster.