Are your horizontal packing machines breaking down often? I know the pain of losing money on halted production lines. Let me share how to solve these problems fast.

Automatic doypack packaging machine troubleshooting involves identifying and fixing common issues like sealing failures, film tracking errors, and inaccurate filling. Proper maintenance and quick problem-solving can keep your horizontal packaging lines running smoothly and prevent expensive factory downtime.

I have worked at Acepack in Shanghai for years, managing our B2B digital marketing. As I prepare our promotional materials for Interpack 2026 in Düsseldorf, I talk to our engineers every single day. They teach me exactly how to fix our horizontal form fill seal machines. I will share these simple troubleshooting steps with you today.

What causes sealing failures in doypack machines?

Do your pouches leak after sealing? A bad seal ruins the product and upsets your customers. I have seen this happen, and it is very stressful.

Sealing failures in doypack machines happen because of wrong temperature settings, dirty sealing jaws, or incorrect pressure. You must clean the sealing jaws daily and adjust the heat levels to match the exact thickness of your roll film.

Let us look at temperature issues first. Our horizontal machines use heat to seal the bags. If the heat is too low, the bag will not close tight. If the heat is too high, the plastic film will melt and look terrible. You must check the temperature settings on the touch screen.

Check the Sealing Jaws

The sealing jaws press the film together. Sometimes, plastic melts onto the jaws. This melted plastic creates a dirty surface. A dirty surface means the jaws cannot press evenly. You need to clean the jaws every single day. Use a soft brush. Do not use hard metal tools. Hard tools will scratch the jaws. A scratched jaw will never seal correctly again.

Adjust the Pressure

Pressure is another big factor. The machine must press the film with the right force. If the pressure is weak, the bag will pop open. Our engineers always test the pressure with special tools. You can test it by pulling the sealed bag with your hands. It should not open easily. I remember a time when I was in our Fengxian District factory. A client called me about leaking bags. We checked their settings on a video call. They had the wrong pressure. We guided them to turn a simple knob. The problem stopped immediately.

Understand Your Roll Film

The roll film you use is very important. Some cheap films have bad layers. Bad layers do not melt well. You must buy good quality film. The thickness of the film changes the heat you need. Thick film needs more heat. Thin film needs less heat. You must test a few bags every time you put a new roll of film on the machine.

Here is a simple table to check sealing problems.

Check the Cooling Process

After the hot jaws seal the bag, the bag needs to cool down. Our horizontal packaging machines have cooling jaws. These cooling jaws press the hot seal. They make the seal hard and flat. If the cooling water is not running, the seal will stay hot. A hot seal is weak. The product inside the bag can push the seal open. You must always check the water chiller. Make sure the cold water flows through the cooling jaws.

How do you fix film tracking issues?

Is your plastic film moving off center? This problem causes crooked bags and wastes expensive material. I hate seeing wasted film on the factory floor.

You can fix film tracking issues by aligning the film roll on the unwinding shaft and adjusting the edge guide sensors. Make sure the film tension is even so the plastic web runs straight through the horizontal packaging machine.

Film tracking means how the film moves through the machine. Our machines pull flat roll film horizontally. If the film shifts to the left or right, the bags will look very bad. The print will not match the edges.

Check the Film Roll Position

The first step is easy. Look at the back of the machine. The film roll must sit exactly in the middle of the shaft. If the roll is loose, it will slide side to side. You must lock the roll tightly. We use air shafts. You pump air into the shaft, and it grips the cardboard core of the roll. If the air leaks, the roll gets loose. You must check the air valve on the shaft.

Clean the Guide Sensors

Our horizontal machines have smart sensors. These sensors watch the edge of the film. They tell the motor to adjust if the film moves. Dust in the factory can cover these sensors. A dirty sensor cannot see the film edge. You must wipe the sensors with a clean cloth. When my girlfriend Mia and I were talking about buying a Tesla Model Y, we discussed how important sensors are for driving straight. The sensors on our packaging machines do the exact same job. They keep the film driving straight on the track. If you maintain the sensors, the machine will run perfectly.

Adjust the Tension

Tension is how tight the film is stretched. If the tension is too loose, the film will wander around. If the tension is too tight, the film might break. The touch screen lets you change the tension settings easily. A dancing roller controls this tension. The film moves over this roller. If the roller gets stuck, the tension goes crazy. You must oil the bearings on this roller.

Check the Factory Floor Level

Sometimes the problem is not the machine. The problem is the floor. If your factory floor is not flat, the machine leans to one side. Gravity pulls the heavy roll of film down. This pulling ruins the tracking. You must use a spirit level tool. Place it on the machine frame. Adjust the machine feet until the frame is perfectly flat. This small detail solves many tracking problems very quickly.

Why is the pouch filling inaccurate?

Are your bags too full or too empty? Giving away free product hurts your profits, and empty bags make customers angry. We must stop this loss.

Pouch filling is inaccurate because the filling pump needs calibration or the product density changes during the shift. You fix this by testing the pump weight on a scale and ensuring the product flows evenly into the hopper.

Accurate filling is the most important part of packaging. If you pack 1000ml of liquid, the bag must hold exactly 1000ml. Our machines use different devices to measure the product.

Calibrate the Filling Pump

Over time, pumps can lose their exact timing. You need to calibrate the pump. Calibration means testing and correcting the pump. You put a sealed empty bag under the filler. You catch the product. You weigh the bag on a small scale. If the weight is wrong, you type a new number into the touch screen. You should do this test every morning before starting production.

Monitor Product Changes

Sometimes the machine is fine, but the product changes. If you pack a hot liquid, it might flow fast. When the liquid cools down, it gets thick. Thick liquid flows slowly. This change will make the weights wrong. You must keep the product at a steady temperature. You can use a heated hopper to keep the liquid warm.

Here is a table showing common filling devices we use on our horizontal lines.

Check for Air Bubbles

Air bubbles inside the pump will ruin your weights. The pump will push air instead of product into the bag. You must bleed the air out of the pipes before you start packing. Always check the hoses for leaks. A small leak will pull air into the system. Tighten all clamps and replace old hoses.

Keep the Hopper Full

The hopper is the big metal bowl on top of the machine. It holds the product before filling. If the hopper is almost empty, the pressure drops. Low pressure makes the filling slow and light. If the hopper is very full, the pressure is high. High pressure makes the filling fast and heavy. You must use an automatic feeding system. This system keeps the hopper at the exact same level all day long. A steady level means a steady weight.

How can you prevent frequent machine downtime?

Does your machine stop working multiple times a day? A stopped machine costs your factory thousands of dollars. I want to help you run continuously.

You can prevent frequent machine downtime by creating a strict daily cleaning schedule and replacing worn parts before they break. Training your operators to spot early warning signs will keep your horizontal packaging line running at maximum speed.

Machine downtime is the enemy of any production manager. When I plan our booth for Interpack 2026, I always highlight how reliable our Acepack horizontal machines are. But even the best machines need good care.

Create a Daily Maintenance Plan

You cannot wait for the machine to break. You must prevent the break. Every operator must have a checklist. At the end of the shift, they must wipe the machine clean. They must oil the moving parts. They must check the air pressure tubes. A clean machine runs smoothly. A dirty machine creates friction, and friction breaks metal.

Train Your Operators Well

Many problems happen because the operator does not know what to do. You must train your staff. They need to know how to read the error messages on the screen. If they hear a strange noise, they must know how to stop the machine safely. Good training saves a lot of time. We invite our clients to Shanghai to train their operators. It makes a huge difference.

Here is a simple maintenance checklist for your HFFS machine.

Keep Spare Parts Ready

Some parts wear out quickly. Things like cutting knives, heater wires, and rubber belts will not last forever. You must keep extra parts in your factory. If a belt breaks, you can change it in five minutes. If you do not have the belt, you might wait three days for shipping. That is a terrible delay.

Update the Machine Software

Our horizontal packaging machines have small computers inside. These computers run software. Sometimes we find better ways to control the motors. We write new software. You must ask our service team to update your machine. New software can fix small bugs. It makes the touch screen run faster. It makes the sensors more accurate. Updating software is a very easy way to prevent strange machine stops. It only takes a few minutes, but it gives you a very stable packaging line.

Conclusion

Troubleshooting your automatic doypack machine is simple when you learn the basics. Keep the machine clean, check your settings daily, and your packaging line will run perfectly.