Dalian blown film unit: a key equipment for improving production efficiency

In the modern packaging industry, blown film units, as a core equipment, are gradually becoming an indispensable and important component of many enterprise production lines. It is widely used in various fields such as food packaging, daily consumer goods, industrial packaging, etc., by heating and melting plastic particles, and then blowing and cooling them through shape molds to form a film.

1、 Basic structure of blown film unit

The blown film unit mainly consists of the following parts:

1. Extruder: Heating and melting plastic particles to extrude molten resin is the heart of the entire machine. The design and materials of the extruder directly affect the efficiency of production and the quality of the film.

2. Mold: After the molten resin comes out of the extruder, it forms a tubular film through the mold, which is usually divided into two types: circular mold and straight mold. Circular molds are one of the core components of blown film machines, widely used in various blown film units due to their superior film-forming quality and uniformity.

3. Blowing device: After the molten resin passes through the mold, air enters through the blowing nozzle to form an airbag, which continuously blows the film outward to achieve the desired thickness and width.

4. Cooling system: The cooling system ensures rapid cooling of the film during the inflation process, preserving its shape stability and physical properties. Cooling methods usually include water cooling and air cooling.

5. Winding device: The cooled film material will be wound up, which may also include cutting, measuring, and other processes to ensure the quality and specifications of the final product.

2、 Working principle of blown film unit

The working process of the blown film unit can be summarized as the following steps:

1. Raw material feeding: Dry plastic pellets are fed into the extruder hopper.

2. Heating and plasticization: Plastic particles undergo a series of heating and plasticization processes under the action of the extruder screw, transforming into a viscous molten state.

3. Extrusion to form a film tube: Molten resin is extruded through a mold to form a thin and uniform film tube.

4. Membrane tube inflation: Inflate the membrane tube to the desired thickness and diameter by blowing air. This process requires strict control of air pressure to ensure the uniformity and strength of the membrane.

5. Cooling and drying: The inflated film is rapidly cooled and solidified through a cooling system.

6. Roll up and cutting: The cooled film material is rolled up onto the shaft and cut if necessary to form the final coil like product.

3、 Application fields of blown film unit

The application range of blown film unit is very wide, mainly used in the following aspects:

1. Food packaging: such as cling film, fast food bags, cooked food packaging, etc. The blown film unit can produce highly transparent, high-strength, and puncture resistant film materials, helping to extend the shelf life of food.

2. Daily consumer goods: such as shopping bags, garbage bags, fresh-keeping bags, etc. Product packaging typically requires good toughness and durability, and blown film units meet this requirement.

3. Industrial packaging: including heavy-duty packaging, pallet film, etc., usually used for packaging bulk commodities, chemicals, etc. The blown film unit can produce film materials with adjustable thickness and diverse specifications to meet different industrial needs.

4. Agricultural film: such as plastic film, greenhouse film, etc. The agricultural field requires film materials to have certain transparency and UV resistance, and blown film units can also be customized according to needs.

4、 Choose the appropriate blown film unit

When choosing a blown film unit, companies need to consider multiple aspects:

1. Production demand: The production scale, output demand, and product type of an enterprise will directly affect the specifications and functions of the required machines.

2. Equipment performance: The power of the extruder, the design of the screw, the material and structure of the mold, and the efficiency of the cooling system are all technical indicators that need to be focused on when selecting equipment.

3. Ease of operation: The humanization of the machine's operating system will directly affect the convenience of daily production and industrial safety.

4. After sales service: A good after-sales service system will provide guarantees for the long-term operation of the enterprise, including equipment fault handling, technical support, etc.

5、 The future development trend of blown film unit

With the continuous advancement of technology, blown film units are also developing towards high efficiency, environmental protection, and intelligence.

1. Efficient and energy-saving: The new blown film unit has introduced energy-saving technology in its design, significantly reducing energy consumption by optimizing the extruder and heating system.

2. Application of environmentally friendly materials: Currently, environmentally friendly packaging materials are becoming a trend, and many blown film units are beginning to develop biodegradable materials to reduce their impact on the environment.

3. Intelligent operation: The application of digital and intelligent technology makes the operation of the blown film unit more convenient, and real-time monitoring and adjustment of the production process are achieved through a human-machine interface.

4. Multifunctionality: Modern blown film units are increasingly developing towards multifunctionality, which can accommodate different types of raw materials. By improving the mold and cooling system, the same equipment can produce film materials of different specifications and thicknesses.

As an important equipment in today's packaging industry, blown film units are constantly driving the development and progress of the industry. From the initial simple equipment to today's efficient and intelligent production lines, blown film units are constantly improving the production efficiency and product quality of the packaging industry. With the continuous innovation of future technologies, we believe that blown film units will usher in new breakthroughs in environmental protection, energy conservation, and intelligence, contributing more to sustainable development.