How to Operate & Maintain a VFFS Machine

In today’s competitive packaging landscape, manual or semi-automated pouch filling leads to inconsistent seal quality, material waste, and production bottlenecks—especially when handling snacks & nuts, coffee & powder products, sauces/pastes/liquids, or hardware/seeds/granular goods. The solution lies in fully automated vertical form-fill-seal (VFFS) systems like the DGD-W30TD series, which eliminate human error, reduce labor costs, and deliver high-speed, leak-proof packaging at 10–60 pouches per minute. These machines are engineered for precision and hygiene, using intelligent protection logic such as “No bag, no fill; no bag, no seal” to prevent costly material loss. For overseas factory owners managing diverse product lines—from powdered supplements to viscous sauces—mastering the operation and maintenance of a VFFS machine is essential to ensure uptime, compliance, and consistent output quality.

What You Need

To successfully operate and maintain a VFFS machine, you must have the correct equipment setup and operational readiness. Begin with a fully assembled DGD-W30TD-W series machine equipped with the appropriate filler module based on your material type: use the DGD-W30TD-W-YSK280 for pure liquids, DGD-W30TD-W-G300 for pastes, or DGD-W30TD-W-K500 for regular granules. Ensure an external air compressor delivers stable 0.6–0.8 MPa pressure, as fluctuating air supply can disrupt film threading and sealing consistency. All contact surfaces must be made of food-grade SUS304 stainless steel—standard across the entire DGD-W30TD series—to meet hygiene requirements for snacks & nuts and coffee & powder products. Additionally, verify that the pouch film width falls within the machine’s supported range (50–200 mm), and confirm that the selected model’s production speed (10–60 pouches/minute) aligns with your daily volume needs. Always pair the VFFS system with a compatible metering device: for powders, use the DGD-W30TD-W-F500 auger filler; for granules, integrate with a TD-14-0.5L or TD-10-0.5L multi-head combination weigher (multi-head weigher) to ensure accurate dosing without particle breakage.

Step-by-Step Operation Guide

Begin by powering on the machine and initializing the PLC touch interface, selecting your language and confirming the current production mode. Next, load the pre-cut pouch film roll onto the film carriage, ensuring the film feed path is clear and aligned with the forming tube. Use the manual film threading guide—visible via the HMI screen—to slowly pull the film through the heating zone and into the sealing jaws. Once the film is threaded, initiate the automatic film threading sequence: the machine will automatically detect the film edge and lock it into position. This process takes approximately 2–3 minutes and is critical for preventing misalignment during high-speed operation.

After successful threading, calibrate the dosing system. For liquid/paste applications using the DGD-W30TD-W-G300 model, set the pump stroke volume via the HMI to achieve ±0.1g accuracy per pouch. For granules, use the three-head electronic linear weigher (DGD-W30TD-W-K500) and adjust each weigher’s target weight using the calibration menu—ensure all three are balanced within ±0.5g to avoid overfilling. During this step, run a test cycle with empty bags to verify that the film forms correctly and the sealing jaws close uniformly.

Once calibrated, start the production cycle. The machine will automatically pick up the pouch, open it via suction cups, fill it according to preset parameters, and seal it using mesh-pattern thermal seals. The sealed pouch drops directly onto the outfeed conveyor at a rate of up to 60 pouches per minute. Monitor the first 10–15 finished units closely: check for seal integrity, proper fill level, and absence of leaks. If any defect appears, pause the line and recheck the film tension, sealing temperature, or dosing calibration. The intelligent detection system will alert you if a bag is missing or improperly formed—this prevents wasted material and ensures every pouch meets quality standards.

Common Mistakes & Fixes

One of the most frequent issues is improper film threading, leading to misaligned seals or broken films. To avoid this, always follow the step-by-step guide on the HMI screen and never rush the threading process. If the film tears during startup, verify that the film roll is properly secured and that the tension rollers are adjusted correctly—excessive tension causes brittleness, while too little leads to slippage. Another common failure is seal leakage due to incorrect sealing temperature or pressure. Refer to the machine’s default settings: the sealing temperature should be maintained between 160°C and 200°C depending on film thickness. Adjust in increments of 5°C until the seal holds under a 10N pull test.

Dosing inaccuracies often stem from clogged nozzles or unstable flow. For paste filling (DGD-W30TD-W-G300), ensure the pneumatic plunger pump’s blowoff function is active—this prevents stringing after each fill. If drips occur, clean the nozzle with a brush and flush with clean water. For powders (DGD-W30TD-W-F500), dust buildup around the auger nozzle can cause uneven filling. Clean the nozzle and hopper daily using compressed air and wipe with a lint-free cloth. If the machine repeatedly fails to detect a bag, inspect the photoelectric sensor near the forming tube—it may be dirty or misaligned. Wipe the sensor lens with alcohol and recalibrate the detection threshold in the HMI.

A recurring issue in granule processing is particle breakage during filling. This occurs when the material drops from too high a height. To resolve, ensure the combination weigher (e.g., TD-14-0.5L) is mounted at the optimal height above the filling chute, and that the discharge gates open smoothly. Using a low-drop design reduces impact force and preserves the shape of fragile items like dried fruit or small hardware parts.

Scaling Up Production

To scale up beyond 60 pouches per minute, consider upgrading to a higher-capacity model within the DGD-W30TD series, such as the DGD-W30TD-W-J500 for mixed sauces or pairing multiple units in parallel. However, note that the maximum speed remains capped at 60 pouches/minute per machine—no model exceeds this unless custom-engineered. For larger volumes, integrate a continuous feeding system: connect the VFFS machine to a bulk storage silo with a gravity-fed hopper or a screw conveyor to maintain steady material flow. For granules, use the TD-14-0.5L or TD-10-0.5L multi-head combination weigher (multi-head weigher) to handle high-throughput weighing, reducing downtime from manual batch checks.

Implement a centralized control system using a master PLC to synchronize multiple machines, including the stand-up pouch packing machine and automatic zipper-making unit. This allows for real-time monitoring of fill weight, seal quality, and machine status via remote access. Also, plan for preventive maintenance cycles: schedule lubrication every 100 hours of operation and replace sealing molds every 5,000 hours. By scaling with modular integration and data-driven oversight, you can increase throughput without sacrificing precision or safety.

FAQ

Q: Can I switch between liquid and powder packaging on the same machine? A: Yes, but only if the machine is configured with interchangeable filling modules. The DGD-W30TD-W-YSK280 (liquid) and DGD-W30TD-W-F500 (powder) models require different filling heads and cleaning procedures. Always perform a full sanitation cycle before switching materials—flush the liquid pump with clean water or purge the powder hopper with compressed air to prevent cross-contamination.

Q: What is the recommended cleaning frequency for the sealing jaws? A: Clean the sealing jaws after every 8 hours of continuous operation or whenever residue is visible. Use a soft brush and non-abrasive cloth to remove film debris and prevent carbon buildup. Never use metal tools—this damages the heat-resistant coating. A clean jaw ensures consistent seal strength and extends the life of the sealing mold.

Q: Why does my machine stop during production even though there’s no material jam? A: Check the photoelectric sensor detecting the film edge. If the sensor is blocked by dust or misaligned, the machine may halt due to "no film detected" error. Recalibrate the sensor sensitivity via the HMI and clean the lens with isopropyl alcohol. Also verify that the air pressure remains within 0.6–0.8 MPa—low pressure can affect suction cup performance and trigger false stops.

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