20–130 m/min Variable-Speed Film Coating Machine for Cement Packaging Fabric

Coordinating the Complete Line Speed

Cement packaging fabric coating requires more than increasing the speed of one motor. Unwinding, substrate preheating, resin extrusion, lamination, cooling, trimming and rewinding must remain coordinated.

This 20–130 m/min Variable-Speed Film Coating Machine uses frequency control and centralized PLC operation to adjust the line according to the PP woven substrate, coating thickness and roll requirements.

The 130 m/min value is the maximum line speed. It is not a guaranteed production speed for every coating specification.

Synchronization Across the Process

When the line speed changes, extrusion output, die temperature, web tension and cooling-water conditions should also be checked.

Speed Strategy by Production Stage

Startup and trial coating

During startup, the operator checks the web path, EPC guiding, extrusion condition and cooling system before gradually entering continuous production. Trial coating confirms the width, thickness and surface condition.

Continuous operation

After the settings are approved, the speed can be increased to a level suitable for the order. The selected speed should maintain coating and winding conditions rather than simply approach 130 m/min.

Roll or specification change

A change in substrate width, coating thickness or resin requires corresponding adjustments to unwinding tension, extrusion output, die width and rewinding speed.

Application

The machine is used for single- or double-sided PE or PP extrusion coating of woven cement sack fabric. It supports continuous unwinding, coating, cooling, edge trimming and rewinding for cement packaging material manufacturers. The coated fabric can proceed to printing, cutting, valve formation and sewing. Fine cement powder containment, moisture control and closure performance depend on coating continuity, thickness, sack design and finished-product testing.

Technical Specifications

What to Check During Speed Acceptance

Acceptance should not be based only on whether the line reaches 130 m/min. Testing should use the agreed cement sack substrate, coating width and thickness to check:

• Continuous web alignment;
• Coating width and thickness;
• Visible wrinkles on the laminated fabric;
• Coating continuity;
• Edge-trimming position;
• Rewound roll alignment;
• Synchronization after acceleration;
• Temperature and cooling conditions during continuous operation.

FAQ

Is 130 m/min the fixed operating speed?

No. Actual speed depends on substrate width, coating thickness, resin, extrusion output, cooling and rewinding conditions.

Does increasing speed always increase usable output?

Not necessarily. If extrusion, cooling or rewinding cannot remain synchronized, increasing speed may affect the coated roll.

Does the machine produce finished cement sacks?

No. It coats and rewinds the substrate. Printing, cutting, valve construction and sewing require downstream equipment.

Can coating completely prevent cement powder leakage?

This cannot be guaranteed from machine parameters alone. Powder containment also depends on coating continuity, sack openings, seams and finished-product testing.