Does a Bottom Seal Bag Making Machine Need Six Lines?

A Bottom Seal Bag Making Machine with six parallel lanes changes the output equation by producing six bags per cycle instead of one. At 100×6 pcs/min, the combined throughput reaches 600 bags per minute—36,000 bags per hour during continuous operation. That architecture suits converters supplying grocery chains, retail groups, or e-commerce fulfillment centers where the order volume justifies a multi-lane investment. This article explains how the six-line double-layer design works, what hot sealing and cold cutting contribute to bag quality, and what to verify when you're matching a multi-lane system to your production floor.

How Does Six-Line Configuration Multiply Output?

Parallel Lanes and Combined Throughput

A single-line machine produces one bag per machine cycle. A six-line machine runs six independent lanes in parallel, each producing its own bag on every cycle. The CX-TB-320×6 operates at 100 cycles per minute, so the combined output is 600 bags per minute.

That output level is not achievable by simply running a single-line machine faster. The mechanical limits of sealing and cutting constrain how fast a single lane can cycle. Adding lanes is the practical route to higher throughput without pushing the seal jaws and cutting blades beyond their design limits.

Double-Layer Film Handling

The double-layer configuration means the machine processes two layers of film simultaneously, doubling material throughput without doubling the machine footprint. The film thickness range is 0.01–0.04mm, covering the thin-gauge HDPE and LDPE films used in T-shirt bags and lightweight retail carriers.

The double-layer arrangement also means the machine produces bags from two film rolls at once. That configuration suits converters who buy film in paired rolls or who run two colors or two film grades in the same production run.

What Does Hot Sealing and Cold Cutting Deliver?

Heat-Sealed Bottom for Load-Bearing Strength

The hot sealing station applies controlled heat and pressure to fuse the film layers at the bag bottom. The temperature and pressure are regulated to produce a consistent seal across the full 320mm bag width. For a T-shirt bag, that seal has to hold the weight of the contents without separating at the handle cutout or the bottom seam.

A seal that is too cold will peel under load. A seal that is too hot will thin the film at the seal line and create a weak point. The CX-TB-320×6 controls the sealing parameters so the bond is strong without compromising the film integrity.

Cold Cutting for Clean, Professional Edges

Cold cutting uses a sharp blade at ambient temperature to shear the film after the heat seal is formed. Unlike hot cutting, which melts through the film and can leave a rough, beaded edge, cold cutting produces a clean, straight cut.

That edge quality matters for two reasons. First, a clean edge looks professional on the retail shelf. Second, a beaded edge can fuse adjacent bags in the stack, causing the bags to tear when the operator pulls one from the pile. Cold cutting eliminates that problem and produces a stack that separates cleanly.

Where Do Six-Line T-Shirt Bags Get Used?

The six-line configuration is built for T-shirt bags, shopping bags, and flat bags in the retail, grocery, and e-commerce segments. The 250–600mm produce length covers the standard vest-bag formats used at checkout counters, and the 320mm bag width matches the common carrier sizes.

The 0.01–0.04mm film range covers both HDPE, which produces the crinkly, translucent bags used for produce and lightweight goods, and LDPE, which produces the softer, more opaque bags used for general retail. A converter running both film types can use the same machine with adjusted sealing parameters.

What Should You Check Before Selecting a Six-Line System?

How do I match lane count to my order volume?

Six lines produce 600 bags per minute at full speed. If your order book supports that throughput, the six-line machine delivers the lowest unit cost per bag. If your volume is lower, a four-line or two-line configuration may be the better fit. The CX-TB-320×6 is a high-volume tool, and running it at half capacity defeats the economic case for the multi-lane architecture.

What film thickness and type work on this machine?

The standard range is 0.01–0.04mm for HDPE and LDPE. Thicker films would require a different sealing profile and may exceed the machine's heat capacity. Confirm your film grade against the range before ordering, and test the sealing quality on a sample roll.

What maintenance does the six-lane sealing and cutting station need?

Inspect the sealing bars on all six lanes for even temperature distribution. A lane that runs cool will produce a weak seal that fails at the handle. Check the cold-cutting blades for sharpness—a dull blade tears the film instead of shearing it, and the edge quality drops. Clean the film path and the photoelectric sensors to maintain registration across all six lanes.

Straight Answers on Six-Line Bag Production

What does 100×6 pcs/min actually mean?

The machine completes 100 cycles per minute, and each cycle produces six bags—one from each lane. The combined output is 600 bags per minute. During continuous operation, that translates to 36,000 bags per hour.

Can the machine run printed film?

The CX-TB-320×6 is designed for T-shirt bag production from HDPE and LDPE film. Printed film requires registration control, and the machine's standard configuration includes the photocell tracking needed to align the seal and cut with the printed design. Confirm the print repeat length against the 250–600mm produce range before specifying a printed job.

What is the difference between hot sealing and cold cutting?

Hot sealing melts the film layers together to form the bottom bond. Cold cutting shears the sealed film with a sharp blade at ambient temperature. The combination gives the bag a strong seal and a clean edge. Hot cutting would melt the edge, which can leave a rough bead and cause bags to stick together in the stack.

What power and space does the machine require?

The CX-TB-320×6 uses 10kW total power and occupies 7.5×1.8m of floor space, with a weight of 2.5T. Confirm the facility's electrical capacity and the available floor area before installation. The CE certification covers the machine for European market installation.

Let’s Match a Six-Line System to Your Bag Production

Share Your Film Type, Bag Size, and Output Target

A Bottom Seal Bag Making Machine with six lines should match your film grade, bag dimensions, and daily output—not the other way around. The CX-TB-320×6 Fully Automatic Double Layer Six Lines Hot Sealing Cold Cutting T-Shirt Bag Making Machine from Chaoxin runs at 100×6 pcs/min across 320mm bag widths and 250–600mm lengths, handles 0.01–0.04mm HDPE and LDPE film, and carries CE certification with a 3-year parts warranty. If you're specifying a high-volume T-shirt bag line for retail or grocery supply, send us your film type, bag size, and output target — we'll help you confirm the right lane configuration before you order.