As the core equipment for plastic film production, the selection of blown film machine needs to be based on multiple dimensions such as production demand, material characteristics, and industry standards. Based on industry data and standards, this article outlines the key elements for selecting blown film machines, providing users with scientific decision-making basis.
1、 Clear production demand is the primary prerequisite
The selection of a blown film machine should first clarify the type, specifications, and production requirements of the film material. It can be divided into three categories according to the use: agricultural, packaging and industrial use: agricultural film blowers have major dimensions and anti-aging performance, for example, greenhouse films need to meet 3-15m width; The blown film machine for packaging emphasizes thickness uniformity (industry standard requirement within ± 2%) and printing adaptability, such as achieving a precision of 0.01-0.1mm for food preservation film; Industrial blown film machines focus on special properties such as corrosion resistance and barrier properties. In terms of production speed, the conventional range is 30-200 meters per minute, and equipment models need to be matched according to production capacity planning.
2、 The characteristics of raw materials determine the adaptability of the process
Different plastic raw materials have differentiated requirements for equipment parameters. Taking polyethylene (PE) as an example, HDPE has a melting point of 210-230 ℃ and requires high temperature control accuracy (within ± 2 ℃), making it suitable for high-strength packaging films; LDPE melting point 160-180 ℃, suitable for flexible products such as cling film; Due to its linear structural characteristics, LLDPE needs to adjust the screw speed and inflation ratio to optimize its tensile strength. The processing of recycled materials requires attention to impurity filtration systems, such as double-layer co extrusion technology, which can improve the utilization rate of old materials, reduce problems such as uneven coloring and brittle fracture.
3、 Energy consumption and environmental performance need to be carefully considered
With the advancement of the "dual carbon" target, energy-saving technologies have become the key choice. Mainstream equipment uses frequency converters to regulate motor power, saving 20-30% energy compared to traditional fixed frequency motors; The heating system reduces thermal energy loss through intelligent temperature control, and for example, a packaging enterprise has reduced carbon dioxide emissions by over 50 tons annually after its application. In terms of environmental protection, the processing capability of biodegradable materials has become a new trend. For example, PLA biodegradable films require dedicated temperature control modules and die designs to ensure stable melt flow.
4、 Automation and maintenance costs impact full cycle benefits
The degree of automation directly affects production efficiency and labor costs. Advanced models are equipped with functions such as automatic screen changing, inflatable shaft winding, and online thickness monitoring, which can reduce manual intervention and improve product consistency. In terms of maintenance costs, attention should be paid to the lifespan of key components: the screw barrel needs to be replaced every 5000 hours, the gearbox lubricating oil needs to be updated every 3000 hours, and vulnerable parts such as foam stabilizers and air rings need to be calibrated regularly. A case study of a certain enterprise shows that automation equipment reduces labor costs by 30% and annual maintenance costs by 15% compared to traditional models.
5、 Industry standards and data validation ensure reliability
The selection criteria should refer to the current industry standards. The 2025 Industry Standard for Blowing Film Machines specifies that the uniformity of film thickness should be within ± 2%, the fluctuation of production speed should not exceed ± 5%, and the safety and environmental protection indicators should meet the requirements of GB 16288-2021. The data source should prioritize authoritative reports released by the National Bureau of Statistics and industry associations, such as the "2022-2031 China Plastic Blowing Film Machine Industry Market Panorama Research Report", which shows that the scrap rate of equipment that meets new standards has decreased by 4 percentage points compared to old models, and energy consumption has decreased by 18%.
The selection of blown film machine should be based on production reality, combined with raw material characteristics, energy consumption standards, automation requirements, and industry standards. Through data verification and case comparison, a balance between performance and cost can be achieved. With technological iteration, innovative directions such as biodegradable material adaptation and intelligent monitoring will continue to drive equipment upgrades, providing more scientific and environmentally friendly solutions for film production.
