Doypack Packaging Machine

What is a Doypack Packaging Machine?

A Doypack Packaging Machine is a bagging machine that automatically fills stand-up pouches with granules, liquids, powders, etc., and then heat-seals them. It is suitable for a wide range of packaging volumes, typically from 10 ml to 3000 ml, or a weight capacity from 10 g to 2.5 kg.

During operation, the robotic arm removes an empty bag, then prints the production date at a designated location on the bag. Next, air clamps and suction cups work together to open the bag opening; then, the filling nozzle inserts into the bag to fill it with material. The heat-sealing mechanism applies pressure and temperature to seal the bag, and finally, it cools and sets before outputting the finished product.

What are the benefits of a stand-up pouch packaging machine?

To address the technical challenge of material adhesion causing leakage during sealing, the stand-up pouch packaging machine is equipped with a falling tapping mechanism below the filling station. After the material falls in, physical vibration causes any residue at the bag opening to settle. Additionally, a cleaning gripper is added before sealing. To address the drawbacks of hours-long downtime for bag size changes, the equipment abandons traditional screw adjustments and adopts a motor-driven bearing structure. Technicians only need to input the width and length of the new bag on the touchscreen, and the entire robotic arm can synchronously move to the designated position within 5 minutes. These designs reduce packaging leakage rates, improve changeover speed for multi-specification co-production lines, and reduce the frequency of manual intervention on the production line.

Classification of Stand-up Pouch Packaging Machines

Based on the source of the bags, stand-up pouch packaging machines are mechanically divided into two different types: Premade Pouch Machines and Roll-Based Self-Made Pouch Machines.

Premade Pouch Machines: This type of machine has a set of rotary or linear mechanical grippers at the front end. Manufacturers need to directly purchase pre-made empty bags and stack them in the storage tank. The machine does not make the bags; it only handles grabbing the existing bags for subsequent opening and filling.

Roll-Based Self-Made Pouch Machines: This type of machine is equipped with a roll unwinding shaft and a forming plow at the front end. It directly consumes rolls of composite plastic film. The film is physically folded through a forming plow, the bottom edge is heat-sealed longitudinally, and it is cut laterally, forming stand-up pouches on-site inside the machine. These pouches are then directly fed into the filling and sealing stations.

Model Parameter Table

Mechanical Structure of the Packaging Machine

The stand-up pouch packaging machine consists of an electrical control and transmission mechanism. The stainless steel frame houses a variable frequency motor and a cam divider to drive the main turntable to rotate intermittently. The front-end bag storage bin and vacuum suction cups are responsible for conveying the bags; the central filling area is equipped with an anti-drip nozzle with a pneumatic shut-off valve to prevent liquid stringing; the sealing area consists of a cylinder-driven brass heat-sealing strip and a circulating water-cooling strip. The control unit includes a programmable logic controller and an interactive touchscreen. The pneumatic components of the entire machine are distributed through a manifold solenoid valve.

Application Demonstration of Stand-up Pouch Packaging Machine

Due to its adaptability to stand-up pouches, stand-up pouch packaging machines are installed on production lines in various industries. In the snack and pet food industries, it's used to package granular solids such as pistachios, beef jerky, cat food, and freeze-dried pet snacks. In the seasoning and detergent industries, it's used to fill fluids or viscous pastes such as ketchup, salad dressing, laundry detergent refills, and hand sanitizer. For agricultural products and powders, it's used to package small packages of easily dusty or highly airtight materials such as coffee powder, flour, and grains.

Customized Line Integration Process

In actual production, this equipment is often integrated as part of a packaging system, connected to upstream and downstream conveying and weighing machinery to form a continuous power process.

Z-type Material Elevator → Multi-head Combined Scale → Doypack Packaging Machine → Finished Product Conveyor → Weight Detector → Metal Detector

The material is first poured into a ground storage hopper, then vertically and horizontally conveyed to a high altitude by the Z-type material elevator and falls into the multi-head combined scale. The computer calculates and releases the material in compliant grams downwards. Material enters the Doypack packaging machine below through the feed pipe, where it completes bag gripping, opening, filling, and heat sealing. Finished bags fall onto the finished product conveyor and are transported to the quality inspection station: first, a weight detector rejects bags with non-compliant weights; then, a metal detector detects ferrous or non-ferrous metal impurities, triggering an alarm and pushing the defective products into a collection bin.

How much does a Doypack Packaging Machine cost?

The price of a stand-up pouch packaging machine ranges from $1540 to $16200, varying significantly depending on the technology configuration and production requirements. Firstly, the packaging output speed differs between machines operating at 30 frames per minute and those operating at 80 frames per minute, requiring different numbers of motors and cylinder specifications. Secondly, the choice of feed mechanism—liquids require piston pumps, while granules require multi-head combination scales—directly impacts the total cost. Finally, the materials and component brands—choosing between 304 and 316 stainless steel, and using domestic or imported PLC brands—all affect the cost.

Frequently Asked Questions

Q: Can the same machine pack both zippered stand-up pouches and regular non-zippered stand-up pouches?

A: Yes. The pre-packaging machine can handle zippered pouches by adding a "zipper-opening air clamp" at the bag opening station. When packing regular bags, simply disable the air clamp function on the touchscreen.

Q: What are the differences in packaging material costs between roll-to-bag machines and pre-packaging machines?

A: Roll-to-bag machines use pre-printed film rolls, resulting in lower film material costs per bag compared to pre-printed bags. However, the initial purchase cost of roll-to-bag machines is significantly higher than that of pre-packaging machines.

Q: How to prevent liquid material from splashing out during sealing?

A: During the filling stage, the machine employs a two-stage filling technology. First, 80% of the capacity is quickly injected, then the remaining 20% ​​is injected slowly. Simultaneously, the filling nozzle rises mechanically with the liquid level, preventing liquid from splashing onto the bag opening.

Doypack Packaging Machine enables streamlined operations from material handling to finished product inspection. When evaluating equipment, companies should consider the material properties of their products, the actual physical dimensions of the packaging bags, and daily output targets. By adjusting the unloading and weighing units and the structure of the mechanical channels, they can customize automated equipment that suits their workshop layout and production line speed.