Problems With Domestic Production Of Plastic Extruders

Die head: In our country's plastic extruders, both imported and domestic die heads are used more often. Imported ones are not necessarily better than domestic ones. Because the imported die has very high requirements, when designing the circulation, it is specially designed according to the fluidity of the material. The imported mold heads use high-quality materials, and the quality of the products produced is also very good. Using imported mold 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 processing equipment has made great progress in materials, heat treatment, and electroplating. In the past ten years, domestic equipment has basically used domestic dies. In recent years, some products have begun to be equipped with imported dies, but they are still dominated by domestic dies.
Cold roller: Many people think that the slow operation of domestic machines is due to problems with the die head and mechanical design. In fact, the roller is also a key issue. The thickness of domestic casting rollers is 18mm, and the thickness of foreign ones is 8mm. The cast film is suddenly cooled and set. If it is too thick and the shape is set, it will be too slow and it will not open fast. The imported machine will open fast because it is thin. Now Shicheng is also making casting rollers with a thickness of about 9-10mm. We hope that the production line can be accelerated.
Corona: The corona machine did not flatten the film when entering the corona, resulting in uneven corona. The film must be flattened before entering the corona. The best hardness of the corona roller liquid silicone is 70 degrees. Now domestic corona The rollers are all around 65 degrees and not hard enough. Therefore, the liquid rubber roller of Shicheng Company has reached 70 degrees. The main problem of reverse corona is also on the rubber roller, the film is not flattened and the rubber roller is not hard enough.
Online synchronization: Many domestic casting units are synchronized at about 5%. They slowly adjust the speed when starting up to achieve uniform thickness, but this results in a lot of waste. In fact, the main problem is the electrical design and the selection of the reduction gearbox. Now Shicheng Company has improved it. The synchronization is around 0. 1%, and it will drive faster and faster.