Four-Side Sealed Bag, Back-Sealed Bag, Pillow Bag, Powder Vertical Packaging Machine

Four-Side Sealed Bag, Back-Sealed Bag, Pillow Bag, Powder Vertical Packaging Machine

I. What is a Vertical Milk Powder Packaging Machine?

A vertical milk powder packaging machine, as the name suggests, is a machine that keeps the material bags upright during the forming, filling, and sealing processes. It uses rolls of packaging film and automatically completes a series of actions on the machine, including bag making, metering and filling, sealing, and cutting, ultimately outputting finished packaged bags.

It is typically used for packaging powdery and granular materials, with milk powder being one of its most typical and primary applications.

II. Main Workflow

1. The workflow of a vertical milk powder packaging machine can be summarized in the following steps:

2. Film Traction and Feeding: Rolls of composite packaging film (such as aluminum-plastic composite film, kraft paper composite film, etc.) are mounted on the machine and gradually pulled downwards by a traction mechanism.

3. Bag Forming: The pulled-out film passes through a forming device and is folded into a preset shape (such as back-seal bags, three-side seal bags, four-side seal bags, etc.). Back-seal bags are the most common type used in milk powder packaging.

4. Longitudinal Sealing: The longitudinal seams of the film are vertically sealed by a heat-sealing mechanism, forming a continuous cylindrical shape.

5. Horizontal Sealing and Cutting:

A pair of horizontal sealing jaws grip the film cylinder, completing the top seal of the current bag from above and the bottom seal of the next bag from below.

The filling timing is the instant the horizontal sealing jaws grip the bag cylinder, but before the top is fully sealed.

After sealing, a cutter cuts and separates the two bags in the middle of the horizontal seal.

6. Metering and Filling: This is the core step in milk powder packaging. After the bag is formed, the machine uses a metering device to fill the bag with a precise amount of milk powder. Common metering methods include:

7. Screw Metering: The most commonly used. The feeding amount is controlled by controlling the number of rotations of the screw driven by a servo motor. It has high precision and is suitable for powdery materials.

8. Volumetric Cup Metering: The filling amount is controlled by adjusting the size of the volumetric cup. It is relatively fast.

9. Venting: Milk powder contains a significant amount of air. Before sealing, the machine typically has a vibration or compression device to expel the air from the bag, preventing inflation and extending shelf life.

10. Output: The sealed and cut finished packaging bags are conveyed out via a conveyor belt for subsequent boxing and cartoning operations.

III. Core Features and Advantages

High Efficiency: High degree of automation, speed can reach dozens or even hundreds of bags per minute (depending on packaging specifications and configuration).

High Precision: Employs servo motors and precision weighing systems (such as augers with weighing feedback), achieving very high filling accuracy, effectively controlling costs and meeting regulatory requirements.

Space Saving: Vertical design with a small footprint and compact structure.

Diverse Packaging Forms: By changing different forming devices, various sizes and shapes of packaging bags can be produced (such as regular bags, stand-up zipper bags, and spout bags).

Excellent Sealing: Excellent heat-sealing performance effectively blocks oxygen and water vapor, ensuring the quality and shelf life of the milk powder.

Reduced contamination: From film roll to finished product output, the material operates within a closed system, significantly reducing human contact with the material and meeting food hygiene standards.

IV. Conclusion

Vertical milk powder packaging machines are an indispensable key piece of equipment in the back end of modern milk powder production lines. They integrate multiple processes such as bag making, filling, and sealing, achieving efficient, hygienic, and precise automated packaging, greatly ensuring the quality of milk powder products and production efficiency.

Machine Specification:

(We can provide you with exclusive packaging machine customization services according to your needs! Of course,If you need, we can also provide you with customized bag service)