The polyethylene rotary head blown film group is a key equipment in the field of plastic film production, dedicated to processing polyethylene materials of specific densities and achieving film forming through process control. This device is widely used in packaging, agriculture, industry and other fields, and its technical characteristics and production efficiency directly affect the quality of the film.
Core structure and working principle
The equipment consists of an extruder, a rotating die, a cooling system, a traction device, and a winding mechanism. After drying, plastic particles enter the screw barrel and melt and plasticize under external heating and internal friction. After filtering impurities through a three-way filter, the molten material is extruded from the rotating die to form a tubular membrane bubble. Compressed air is injected through the center of the mold head to inflate the film bubble to the target size. After being cooled by the air ring, shaped by the herringbone plate, and flattened by the traction roller, it is coiled into a cylinder by the coiling device. The rotating die design can achieve 360 degree uniform inflation, coupled with an automatic constant temperature control system to ensure that the film thickness uniformity is controlled within ± 2%, which meets the current industry standard requirements.
Technical parameters and performance advantages
Typical equipment parameters display: screw diameter of 65mm, aspect ratio of 1:28-30, speed range of 10-110rpm, main motor power of 22kW, rated extrusion capacity of 70kg/h, capable of producing film thickness of 0.006-0.10mm, and bending diameter of 750mm × 2. Compared to traditional equipment, the rotating head structure improves the stability of the membrane bubbles, with a production speed of 30-200 meters per minute. The temperature control system has an accuracy of ± 2 ° C, ensuring stable melt flow and good optical performance of the product. In terms of energy-saving design, variable frequency speed regulating motors are more energy-efficient than traditional equipment and in line with the trend of green production.
Application scenarios and industry value
In the field of liquid packaging, double-layer co extruded composite film can extend the shelf life; In the agricultural field, barrier films are used for greenhouse covering, which have the characteristics of moisture resistance, oxygen isolation, and oil resistance; In industrial packaging, film is used for dust-proof electronic components and scratch resistant mechanical parts. The three-layer co extrusion unit can produce composite films with a folding width of 1500mm and a thickness of 0.08mm, meeting the packaging needs of fresh milk, beverages, and other products. The rotating die head combined with the corona treatment device can increase the surface tension of the film and enhance its printing adaptability.
Industry standards and development trends
The current industry standards require higher equipment performance: the uniformity of film thickness needs to be within ± 2%, the production speed range is clearly defined as 30-200 meters/minute, and the temperature control fluctuation is strictly controlled within ± 2 ° C. In terms of the market, the demand for biodegradable material blown film machines is increasing, and energy-saving technology and waste reduction have become research and development directions. With the advancement of international cooperation, the demand for packaging and agricultural films from emerging economies has driven the growth of equipment exports. Consumer upgrading drives the development of customized film products, prompting enterprises to improve equipment accuracy and automation levels.
The polyethylene rotary head blown film group has achieved efficient, uniform, and energy-saving film production through structural innovation and process optimization. The technological evolution and improvement of industry standards will continue to promote the development of the plastic packaging industry towards green and refined directions, meeting diversified market demands.
