Bag-Making Machines: Types, Specs

Bag-Making Machines: Types, Operating Principles and Key Specifications

1 Oct 2026

Bag-making machines turn a roll of film into finished bags. They go by many names, but the principle is the same: the roll passes through the machine and comes out as a finished product. We review the types of machines, how they work and the specifications to check when choosing.

Types of bags and machines

T-shirt bags (vest bags);

packaging bags;

die-cut handle bags;

trash bags on a roll — with and without drawstrings.

How it works

All bag-making machines work the same way: the film roll passes through the machine, where seams — bottom or side — are sealed, knives cut off the blank and the finished product is formed. Some bags come out in stacks, others on rolls. Perforation knives, units for applying labels or tapes (for example, for the ties on a garbage bag) and other elements are also used.

Key specifications

minimum and maximum bag width;

minimum and maximum bag length;

output format — in stacks or on rolls;

film materials the machine can process.

Output and lanes

The main specification of a bag-making machine is the number of lanes, that is, how many rolls can be loaded into the machine at the same time. Some machines for packaging bags process from 2 to 8 rolls simultaneously. The more lanes, the higher the output.

When assessing output, take into account the number of sealing knife strokes: for a two-lane machine this figure is multiplied by 2, for a four-lane machine by 4, and so on.