Film Blowing Machine
What is Flim Blowing Machine
A Film Blowing Machine is essential equipment in plastic film manufacturing. The process involves melting plastic granules via an extruder screw, forcing the melt through a circular die, and inflating it into a thin tube (bubble) with compressed air. This bubble is cooled by air rings, flattened by collapsing frames, and finally rewind into finished rolls.
These machines are highly adaptable, processing virgin, recycled, or filled materials. They produce a wide range of products, including shopping bags, industrial liners, and agricultural mulch films. Multi-layer co-extrusion technology further enhances film properties-combining strength, barrier protection, and cost-efficiency-making it indispensable for modern flexible packaging industries.
Advantages of Film Blowing Machine
Widely used
Suitable for food-grade packaging bags, T-shirt bags, and various other applications, including the medical field
Better film quality
The inner and outer layers can be made from PE with different blends or grades (such as LDPE + HDPE); after lamination, the film's tensile strength, puncture resistance, tear resistance, and toughness are significantly superior to those of a single-layer film of the same thickness.
Easy to operate
Easy to operate, compact structure, centralized control and high degree of automation.
High production output
The film blowing machine, combined with efficient air ring cooling and automatic rewinding, the production line has fast speed and high output per unit time, effectively improving production capacity.
Why Choose US
Our Factory
Established in 1999, name wenzhou jinghua machinery co., Ltd.Exported machine to Pakistan in 2007, exported machines to Bangladesh in 2008, exported machine to Egypt in 2009. and many other 50 countries in these years.
long warranty
The Warranty Period for the contract equipment shall be 12 months from the next day after the end of testing the machine.
24H Online Service
We offer 24-hour online service, ensuring support is always available whenever you need us.
Global Shipping
We sincerely welcome friends from all over the world to cooperate with us on the basis of long-term mutual benefits.
Types Of Film Blowing Machine
Single Layer Film Blowing Machine
Designed for polyolefins (LDPE, HDPE, LLDPE), these machines feature standard barrier screws and typically operate in an upward-blowing configuration with air ring cooling. They run at higher processing temperatures (150–230°C). The resulting film is non-toxic, flexible, and heat-sealable, making it ideal for shopping bags, food packaging, and agricultural films.
ABA Film Blowing Machine
ABA film blowing machine adopts ABA co-extrusion technology to give the film more diversified performance and application characteristics.Through the design of the ABA structure, recycled materials can be used in the center layer.The three-layer structure of the ABA blown film machine can achieve the same thickness and strength of film with less raw material, effectively saving raw material costs.
ABC Film Blowing Machine
ABC 3 layer Blown Film Machine provides higher quality and more functional film solutions for the packaging industry with its efficient and stable production capacity, excellent film quality and intelligent operation. It is an indispensable and important production equipment for the modern packaging industry.
PP Film Blowing Machine
PP film blowing machine is a specialized equipment used for producing polypropylene (PP) film. It is produced by extruding molten polypropylene plastic downwards and blowing it into a film tube through a circular die, followed by processes such as water cooling, traction, drying, and winding, ultimately resulting in a polypropylene film.
PVC Film Blowing Machine
The Film Blowing Machine is suitable for blowing film of various specifications by tube film process of PVC plastic resin. The film has the advantages of good transparency, good gloss and high shrinkage. It is a new popular packaging material nowadays. It is widely used in food, beverage, tea, glass products, handicrafts, sanitary ware and cosmetics. Outerwear of products, electronic products, etc.
Self-zip Film Blowing Machine
Based on the Film Blowing Machine, Self-zip Film Blowing Machine is designed creatively. With an embossing button automatic sealing zip at the very opening, a bag can be produced automatically and freely. The main processor adopts frequency conversion speed governing, photoelectric control, air filling automatically, with a high content of science and technology and power applicability.
Mini Type Film Blowing Machine
The Mini type film blowing machines offer several advantages over other types of film blowing machines, especially for businesses that require a low-volume production of plastic films. Mini type film blowing extruders are designed to be smaller and more compact than other film blowing machines, which makes them easy to install and use in smaller spaces. They can be easily moved around and stored, which is especially useful for businesses with limited space.
Mold of Film Blowing Machine
The Film Blowing Machines are mainly composed of plastic extruder, air ring, traction device, cooling device, heating expansion device, rewinding device, heating system and electronic control device.
How to Use Film Blowing Machine
Proper operation begins with a thorough pre-check: inspect power, lubrication, and raw material purity. Heat the barrel and die to the specific resin temperature (e.g., 160–230°C for PE) and allow a soaking time of 20–60 minutes to ensure thermal uniformity before starting the screw.
Start squeezing at low speed. Once the plastic particles flow evenly out of the mold, pull the tube upwards, inflate it with air to form bubbles, and guide it through the folding frame and pressure roller. Adjust the inflation ratio to achieve the target distance and width.
Continuously monitor the film thickness and motor during the production process. When stopping the machine, first stop the extruder, and then stop the auxiliary equipment. Do not use metal tools to clean the mold and always wear heat-resistant gloves. Before cutting off water and power, let the screws cool to below 100 ° C to prevent them from getting stuck. Following these steps can ensure safety and product quality.
FAQ
Q: What does a film blowing machine do?
A: Film blowing machines are used to make plastic films. After the plastic is extruded through the die head, it is stretched by a traction machine and cooled to obtain a tubular film. Generally, manufacturers of plastic bags, agricultural films, fresh-keeping bags, etc. will purchase film blowing machines
Q: How does a film blowing machine work?
A: In the film blowing machine process, pressurized air is forced through a nozzle into a heated plastic preform, which expands to fit the contours of a mold. Through this process, a thin plastic wall is formed in the shape of a mold, leaving a hollow cavity.
Q: What materials are used in blown film?
A:In the process of Blown Film Extrusion, the common resins that are used are Polyethylenes (LDPE, HDPE and LLDPE). Though, various other materials can also be used in this process, as a blend with resins or even as single layers in the multi-layer film structure. Some of these materials are PP, PP, and EVOH.
Q: What is the temperature of blown film extrusion?
A: Blown films also require lower melting temperatures than cast extrusion. Measured at the die opening, the temperature of cast film is about 220°C, where as the temperature of blown film is about 135°C.
Q: What is the take up ratio for blown film?
A: Blow-Up Ratio (B.U.R.) is the ratio of the final blown film diameter to the die lip diameter, affecting film thickness and strength. For LDPE/LLDPE, B.U.R. is typically 2 to 3, while for HDPE, it ranges from 6 to 8. Optimizing the B.U.R. is crucial for improving the overall quality of blown film production.
Q: What is a film blowing machine?
A: As the name implies, a film blowing machine is a machine for blowing film. It is a plastic production machine. There are many types of film blowing machines, including PE, PC, PVC, etc. Different types of films can be blown into different types by adding different types of particles.
Q: How does a blowing machine work?
A: n the blow molding process, pressurized air is forced through a nozzle into a heated plastic preform, which expands to fit the contours of a mold. Through this process, a thin plastic wall is formed in the shape of a mold, leaving a hollow cavity.
Q: What is an example of blown film extrusion?
A: Here are some examples of films that can be produced using blown film extrusion lines: LDPE (low-density polyethylene) films: These films are soft, flexible, and have good clarity. They are commonly used for general-purpose packaging applications, such as bags and wraps.
Q: What is a film blowing machine?
A: A film blowing machine involves one process used to make plastic film. Extruded tubular processing is most often used with polyethylene films but can be used with other polymers.
Q: How to operate a film blowing machine?
A: Step 1: Install the die head. Start by installing the die head on the extruder. ... Step 2: Adjust the air ring. ... Step 3: Calibrate the temperature and speed controls. ... Step 4: Test the blown film machine.
Q: What are the parts of a film blowing machine?
A: The main components of the film blowing machine include motor, inverter, reducer, screw, screen changing device, mold, air ring, bubble stabilizing frame, herringbone plate, upper traction, upper rotation, winding, guide roller, corona device, etc
Q: What is the frost line of blown film?
A: In plastic film manufacturing by extrusion, the frost line is the point beyond the die where the temperature of the molten plastic falls below the softening point, the diameter of the extruded plastic bubble stabilizes due to the solidification of the polymer.
Q: What are the three basic methods of extrusion?
A: There are three main methods of extrusion: direct, indirect, and hydrostatic. In direct extrusion, also known as forward extrusion, the metal billet is placed in a container and pushed by a ram through the die.
Q: Which machine is used for blowing?
A: Extrusion blow molding machines are commonly used to produce plastic bottles and containers. They are versatile machines that can produce a wide range of bottle sizes and shapes
Q: What are the different types of blowing machines?
A: In general, there are three main types of blow molding: extrusion blow molding, injection blow molding, and injection stretch blow molding.
Q: What is the air ring for blown film?
A: What is the air ring for blown film?
Q: What are the problems with blown film?
A: Contamination is one of the most common—and costly—problems in blown film extrusion. Whether you're producing single-layer or multi-layer film, contamination can lead to defects like gels, streaks, black specs, and off-gassing, which often result in wasted film, rejected rolls, and unplanned downtime.
Q: Contamination is one of the most common—and costly—problems in blown film extrusion. Whether you're producing single-layer or multi-layer film, contamination can lead to defects like gels, streaks, black specs, and off-gassing, which often result in wasted film, rejected rolls, and unplanned downtime.
A: Drawdown Ratio (DDR) in Blown Film Extrusion Definition: DDR = Take-up speed ÷ Die exit speed It measures how much the molten film is stretched in the machine direction.