The Vacuum Gas Flushing Packaging Machine belongs to the food preservation and industrial packaging fields. This equipment integrates thermoforming, vacuuming, inflation, sealing, and slitting functions, and can be considered a complete packaging production line.
If you are a packaging machinery manufacturer, a deep understanding of the structure and operating principles of this equipment will be helpful. As a packaging machinery parts supplier, Hansheng Automation offers complete and reliable parts solutions and a vast knowledge base of packaging machinery. Let me introduce you to this equipment.
What are the core components of Vacuum Gas Flushing Packaging Machine?
Film Traction and Forming System
The core of this system is the film clamping chain and thermoforming die. The high-strength film clamping chain ensures precise step-by-step transport of the film roll (base film). After heating, the base film is stretched under high pressure by the forming die into the pre-defined cup or box-shaped cavity. The maximum stretching depth is a key parameter that determines the packaging volume.
The Vacuuming and Gas Filling System
This is the core of the equipment. It consists of a vacuum pump, a gas filling device (such as a nitrogen port), a high-precision gas flow meter, and a vacuum chamber. The vacuum pump creates a high vacuum (e.g., 10 Pa) within the sealed vacuum chamber to completely exclude oxygen. The system is then filled with a mixed inert gas, such as nitrogen, to a pressure slightly above atmospheric pressure, creating a "high-pressure" environment.
The Heat Sealing System
Located within the vacuum chamber, after gas exchange, a heating plate, under precise temperature and pressure control, instantly fuses the upper film to the pre-formed base film, creating a highly airtight seal.
The Slitting and Control System
The sealed continuous package enters the slitting area, where longitudinal and cross-cutting blades cut the package to the desired size. The entire process is directed by a PLC electrical control system, and the timing, temperature, pressure and vacuum degree of each link are precisely controlled.
Vacuum Gas Flushing Packaging Machine Example and Equipment Parameters
Taking the typical DLZ420 model as an example, the parameters of this model are obtained from professional books and information on the Internet, as shown in the table below.
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Parameter Category |
Details |
Technical Implications & Customer Value |
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Model |
DLZ420 |
Available in A, B, and C size variants, typically corresponding to different numbers of vacuum chambers (e.g., single or double chamber), catering to various production capacity needs. |
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Film Compatibility |
Upper Film Width: 493mm |
Defines the required specifications for packaging roll film. The lower film is wider to meet the technical requirements of thermoforming stretching. |
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Core Performance |
Vacuum Degree: ≤10Pa |
Key to superior preservation. An extremely high vacuum level thoroughly removes oxygen, significantly extending product shelf life. |
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Utilities Requirements |
Maximum Drawing Depth: 70mm |
Determines the maximum depth of the formable packaging tray, suitable for solid products with a certain height or volume. |
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Production Efficiency: 4 - 6 cycles/minute |
Refers to the work cycles per minute of the vacuum chamber. Actual output depends on the number of mold cavities, indicating the production pace. |
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Accuracy: ±0.05mm |
Reflects the quality of mold machining and sealing. High precision ensures consistent and reliable packaging seals, reducing the leak rate. |
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Cooling Water Pressure: ≥0.01MPa |
Used for system cooling (e.g., vacuum pump, sealing components). Required pressure is low and can be met by standard tap water supply. |
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Compressed Air Pressure: ≤0.5MPa |
Used to drive pneumatic components (e.g., cylinders, vacuum chamber lid opening/closing), essential for the automated operation of the machine. |
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Total Power: 16.5kW |
The total power consumption when the machine operates at full load, primarily for heating, vacuum creation, and the drive system. Impacts the customer's operating costs. |
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Physical Dimensions |
Type A: 6200mm×950mm×1800mm |
Different size models offer flexibility for customers to choose based on their production floor layout and space constraints. |
What is the operating procedure of this device?
Film Loading and Drawing
The base film and top film rolls are loaded onto the unwinding reel separately, and the base film is pulled forward in a step-by-step manner by a film clamping chain.
Thermoforming
The base film is heated to a plastic state at a specific station. The mold then presses down to stretch it into the designed packaging box.
Automatic Feeding
The formed film box moves to the feeding area, where the product is placed manually or automatically.
Vacuuming and Inflating
The film box, covered with the top film, enters the vacuum chamber. The chamber lid closes, and high-speed vacuuming and high-precision inflation of protective gas are performed.
Heat Sealing and Cooling
The top and bottom films are heat-pressed together under vacuum, then cooled to set the shape and ensure a secure seal.
Slitting and Output
The continuous product sheet is pulled to the slitting mechanism, where it is cut longitudinally and transversely to the desired size and ultimately output as individual finished products.
Application Fields of Vacuum Gas Flushing Packaging Machine
Food Industry
Prepared Foods and Meat Products: Effectively inhibits oil oxidation and aerobic bacterial growth, extending shelf life.
Snacks (potato chips, nuts, puffed foods): Injected with high-pressure nitrogen provides a cushioning effect, preventing breakage and preserving freshness.
Frozen and Fresh Products (seafood, fresh meat, frozen goods): Prevents freezer burn and oxidative discoloration.
Dairy and Soy Products: Prevents mold and yeast contamination.
Non-Food Industry
Medical Devices: Allows for direct sterilization after packaging, maintaining a long-term sterile barrier.
Electronic Components: Moisture- and oxidation-resistant, ensuring safe storage and transportation of precision components.
FAQ
Q: Are vacuum packaging and air-filled packaging contradictory? Why should they be combined?
A: No. The purpose of first applying a vacuum is to remove as much oxygen as possible (the primary cause of food spoilage). The subsequent introduction of an inert gas (such as nitrogen) achieves two goals: first, it prevents the growth of anaerobic bacteria and food collapse; second, it provides a cushioning effect and resists crushing, making it ideal for fragile products.
Q: Is a higher vacuum level in the equipment always better?
A: Generally speaking, yes. A higher vacuum level (such as 10 Pa) means less residual oxygen and better preservation.
Q: As a packaging machinery manufacturer, which vulnerable parts or critical components of the equipment should be of greatest concern?
A: High-efficiency and continuous operation of the equipment places a heavy strain on component durability. Special attention should be paid to the cleaning and calibration of the heating strips and insulation in the heat sealing system, the oil and seals in the vacuum pump, the film clamping chain and transmission components in the traction system, the bearings and guides in all moving parts, and the optical sensors.
Q: Why does this type of equipment require compressed air and cooling water?
A: Compressed air drives actuators such as cylinders and pneumatic valves, controlling movements like mold raising and lowering and chamber cover opening and closing. Cooling water circulates and cools heat-generating components like vacuum pumps and heat-sealing blades, ensuring long-term, stable operation of the equipment.
Q: What factors limit the thermoforming depth (e.g., 70mm)?
A: The maximum forming depth is primarily limited by the tensile properties of the base film material (e.g., the stretch ratio of PP) and the design of the forming die. Excessive stretching can result in uneven film thickness distribution and even tearing. Therefore, achieving perfect deep drawing requires the coordinated efforts of high-quality stretch film rolls and well-designed heating and forming dies.