Product Specification

400–450 kg/h Extrusion Output Film Coating Machine for Mineral Powder Sack Fabric

Evaluating the Line by Resin Output

When PE or PP is applied to mineral powder sack fabric, the extrusion system must continuously supply molten resin at a rate matched with the coating width, thickness and line speed.

This 400–450 kg/h Extrusion Output Film Coating Machine uses two 110 mm extrusion units with a 33:1 screw L/D ratio. It is designed for single- or double-sided coating of PP woven mineral powder sack fabric.

The 400–450 kg/h value describes extrusion output, not the total weight of finished coated rolls produced per hour.

Relationship Between Output and Coating Settings

Resin demand is mainly determined by:

$$\text{<span style="font-size:16px;"><span style="font-family:arial,helvetica,sans-serif;">Resin demand</span></span>}<span\; style="font-size:16px;"><span\; style="font-family:arial,helvetica,sans-serif;">\propto </span></span>\text{<span style="font-size:16px;"><span style="font-family:arial,helvetica,sans-serif;">Coating width</span></span>}<span\; style="font-size:16px;"><span\; style="font-family:arial,helvetica,sans-serif;">\times </span></span>\text{<span style="font-size:16px;"><span style="font-family:arial,helvetica,sans-serif;">Coating thickness</span></span>}<span\; style="font-size:16px;"><span\; style="font-family:arial,helvetica,sans-serif;">\times </span></span>\text{<span style="font-size:16px;"><span style="font-family:arial,helvetica,sans-serif;">Line speed</span></span>}<span\; style="font-size:16px;"><span\; style="font-family:arial,helvetica,sans-serif;">\times </span></span>\text{<span style="font-size:16px;"><span style="font-family:arial,helvetica,sans-serif;">Number of coated sides</span></span>}$$text{Resin demand}propto text{Coating width}times text{Coating thickness}times text{Line speed}times text{Number of coated sides}

The production setup must balance the 400–450 kg/h extrusion output with an 800–2200 mm coating width, 0.008–0.050 mm thickness and 20–130 m/min line speed.

Using Two Extruders for Double-Sided Coating

The line has two 110 mm extruders and two lamination units, allowing resin to be applied to both sides of the woven substrate.

Each extruder includes a 75 kW motor, frequency converter, 60 kW ceramic heater, hydraulic screen changer and automatic temperature control. A 2500 mm adjustable die controls the extrusion width.

For double-sided coating, the following parameters should be defined separately for each side:

• Resin type;
• Coating thickness;
• Extrusion temperature;
• Effective die width;
• Resin consumption;
• Cooling and pressing conditions.

The specification does not clearly state whether 400–450 kg/h is the combined output of both extruders or the output of each unit. This should be defined in the technical agreement.

Application

The machine is used for PE or PP extrusion coating of woven fabric for industrial mineral powder, mineral granules, inorganic fillers and metallurgical raw-material sacks. The coated fabric can proceed to printing, cutting and sewing and may improve surface coverage, airtightness and moisture resistance according to the final structure. Fine-powder containment, electrostatic control, chemical compatibility and dangerous-goods compliance require separate evaluation of coating continuity, liner, seams and finished sack testing.

Technical Specifications

Data to Record During Trial Production

Trial production should record more than screw speed:

1. PP woven substrate width and weight;
2. PE or PP resin grade;
3. Single- or double-sided coating;
4. Target thickness on each side;
5. Actual line speed;
6. Set and actual temperatures;
7. Effective coated width;
8. Edge-trimming amount;
9. Surface condition after cooling;
10. Resin consumption and usable roll output.

These records help establish settings for each mineral sack fabric specification instead of treating 400–450 kg/h as a fixed operating value.

FAQ

Is 400–450 kg/h the finished fabric output?

No. It is the resin extrusion output. Finished roll output also includes the weight of the PP woven substrate.

Can the two sides use different coating thicknesses?

The twin-extruder configuration allows the two sides to be set separately. The final combination should be confirmed through trial production.

Does coating completely prevent mineral powder leakage?

This cannot be guaranteed from coating alone. Powder containment also depends on coating continuity, openings, seams, liner and finished sack construction.

Does the line produce finished mineral sacks?

No. It performs coating and rewinding. Printing, cutting and sewing require downstream equipment.