With the change of marketing trends and shortage of manpower, the use of Extrusion Die Head has become a new choice in recent years. Considering the product quality and material cost, the Rotary Die Head brings the new business opportunity to the extrusion market. Rotary Die Head is mainly to increase the average of film thickness and ensure the flatness of film when winding. In order to maintain the average of film thickness, Rotary Die Head keeps rotating with the same speed. Besides, the Rotary Die Head distributes the uneven variations uniformly in order to upgrade the evenness of film and to reduce the ratio of thickness tolerance to the minimum. Without the rotation, the film will wrap unevenly and roll irregularly which causes the uneven thickness of film then lead to the gauge bands on the process of Blown Film Winder. Comparing fixed type die heads, the Rotary Die Head is the best option if your products require precision film thickness.