2 Essential Things You Must Know About Bag Making Machines — Tension Control System & Adjustable Bag Size for T-Shirt Bag Machines

When choosing or operating a plastic bag making machine, many buyers focus only on speed or automation level. However, there are two key technical details that directly affect bag quality, production stability, and flexibility—yet they are often overlooked.
 

1. Why the Tension Control System Is So Important in a Bag Making Machine

The tension control system plays a critical role in maintaining consistent film feeding during the bag-making process.
During production, plastic film is continuously unwound, sealed, and cut. Without stable tension, the film may wrinkle, bag length may become inconsistent, sealing quality may be unstable, and the machine may stop frequently.
A high-quality tension control system ensures smooth film feeding, accurate bag length control, clean sealing lines, and reduced material waste. As machine speed increases, stable tension becomes even more important for high-speed and long-term production.
 

2. Bag Size and T-Shirt Bag Opening Size Are Adjustable

Many users believe that bag size is fixed after purchasing a machine, but modern automatic bag making machines offer flexible size adjustment.
Bag length can be adjusted through the PLC or servo control system, while bag width depends on the film width. For T-shirt bag machines, the handle or opening size is adjusted by changing the punching mold.
Different molds allow different handle shapes and sizes without replacing the whole machine, providing high flexibility for supermarkets, retail stores, and customized orders.
 

Conclusion

When evaluating a bag making machine, do not focus only on speed or automation. Pay close attention to the tension control system and the adjustability of bag size and T-shirt bag opening. These two factors directly impact production efficiency, bag quality, and long-term profitability.