300–4000 mm Length FIBC Liner Cutting Machine with Cold Cutting for Jumbo Bag Liners

Liner Length Should Be Calculated from the Assembly Structure

An FIBC liner is installed inside an outer woven bag. Its cutting length may include more than the finished jumbo bag height, depending on the bottom structure, top closure, sealing allowance, and liner-installation method.

The ZNCMJ-2200 FIBC Liner Cutting Machine provides a 300–4000 mm cutting-length range for different jumbo bag liner sizes. Buyers should provide the developed liner dimensions rather than only the finished outer-bag height.

300–4000 mm Range for Multiple Liner Sizes

The same production line may process short liners, standard FIBC inner liners, or longer industrial bulk bag liners. After the target length is changed, the machine performs cold section cutting within the 300–4000 mm range.

The first-piece dimensions, sealing allowance, and film stretching should be checked after every length change. The specified cutting accuracy is ±2 mm, but film tension and elongation during feeding may still affect the measured result.

Cold Cutting and Heat Sealing Are Separate Operations

Cold cutting separates the liner film at the set position without thermally treating the cut edge. Straight heat sealing forms the closed end of the liner. The two functions perform different tasks within the machine process.

Cold cutting does not replace heat sealing and does not prove that the liner is moisture-resistant or leakproof. Finished-liner performance also depends on the film material, sealing structure, heat-sealing parameters, and testing.

Changeover Steps for Different Liner Lengths

1. Review the Developed Liner Drawing

Confirm whether the total length already includes the top structure, bottom structure, and sealing allowance.

2. Check the Film-Roll Specification

Verify that the material width does not exceed 2200 mm and that the roll diameter does not exceed 1100 mm. Record the film material, thickness, and roll construction.

3. Set the Cutting Length

Enter the target length within the 300–4000 mm range and measure the first cold-cut piece.

4. Inspect the Material Condition

Check cut straightness, film stretching, curling, or sticking, together with the lateral position after automatic web guiding.

5. Approve Batch Production

Begin batch processing only after the first-piece length and sealing allowance meet the drawing. Perform periodic inspection during production.

Liner-Length Quality Checks

Key Technical Specifications

Application

This FIBC Liner Cutting Machine is mainly used for 300–4000 mm length cutting of liner film for FIBCs, jumbo bags, and bulk bags. It cuts rolled PE or other compatible liner film into specified lengths for subsequent straight sealing, shaped sealing, liner insertion, and outer-bag sewing. Compatibility with a specific film material and thickness should be confirmed through sample testing.

Capacity Must Be Linked to Cutting Length

The PDF’s 6–8 pieces/min rating applies to L=1000 mm. A 300 mm short liner and a 4000 mm long liner require different feeding distances, sealing cycles, and material-handling times, so one output figure should not be applied to every length.

FAQ

1. Can a 4000 mm liner be produced at 6–8 pieces/min?

This cannot be concluded from the PDF. The 6–8 pieces/min rating applies to L=1000 mm, so a 4000 mm liner requires separate cycle confirmation.

2. Is sealing still required after cold cutting?

Yes, if the liner design requires a closed end. Cold cutting only separates the material and does not replace straight or shaped heat sealing.

3. Does ±2 mm apply to every film material?

±2 mm is the specified cutting accuracy. Film elongation, tension, and surface condition may affect the actual result, so first-piece and batch inspection are required.

.