NRC500 Big Diameter Paper Core Manufacturing Plant Cost

What is a Big Diameter Spiral Paper Tube Machine?

It's an industrial machine that manufactures large-diameter paper tubes and cores by spirally winding multiple layers of paper (or board) onto a mandrel, using a continuous ribbon of material bonded with adhesive.

Key Characteristics for "Big Diameter":

• Typical Range: Tubes from about 150 mm (6 inches) up to 1,200 mm (48 inches) or even more in diameter.

• Wall Thickness: Can produce very thick walls by adding many layers of paper.

• Applications: Not for small yarn cores, but for heavy-duty industrial uses.

How It Works: The Spiral Winding Process

The fundamental principle is the same regardless of size, but scaled up with heavier components.

1. Unwinding: Multiple large rolls of paper (kraft paper, linerboard, specialty papers) are mounted on an unwinding stand. The paper is fed into the machine simultaneously.

2. Gluing: The paper webs pass through a precision gluing system, which applies a controlled amount of adhesive (typically PVA or hot melt) to one side.

3. Spiral Winding & Belt Press: This is the heart of the machine.

   • The glued paper ribbons are fed onto a large, stationary mandrel (the central shaft that defines the tube's inner diameter).

   • A rotating spiral winding cage or "fly-off" mechanism, equipped with pressure belts, wraps the paper around the mandrel at a specific angle (usually around 80-85 degrees).

   • The pressure belts ensure tight, consistent winding and squeeze out excess glue for a strong bond.

4. Cutting: As the tube is formed, it moves forward along the mandrel. A cutting system (often a rotary saw or a traveling saw) cuts the continuous tube to the required pre-programmed length.

5. Ejection & Handling: The finished tubes are ejected from the end of the mandrel. For large diameters, this often involves automated conveyors, rollers, or even robotic arms to handle the heavy product.

Key Machine Components for Large Diameters

The "big diameter" aspect demands robust engineering:

• Heavy-Duty Mandrel: A massive, rigid, and perfectly cylindrical shaft. It must resist deflection under the high winding pressures. Often hollow to reduce weight.

• High-Torque Drive System: Powerful motors and gearboxes are needed to rotate the heavy winding cage and overcome the inertia of large paper rolls.

• Robust Winding Cage & Belts: The cage structure is heavily built. The pressure belts are wide and strong to apply uniform pressure across the large surface area.

• Multi-Roll Unwind Stand: Designed to hold several large, heavy paper rolls (often 1-ton or more) with precise tension control for each web.

• High-Capacity Glue System: Large adhesive tanks and pumps to ensure a continuous supply for the high consumption of a big tube.

• Precision Heavy-Duty Saw: A powerful saw with a sturdy travel mechanism to make clean, square cuts through thick walls.

• PLC Control System: A sophisticated computer controls all parameters: speed, cut length, glue amount, tension, etc.

Applications of Large Spiral Tubes

These tubes are valued for their exceptional strength-to-weight ratio and durability.

• Concrete Column Forms: The #1 application. Single-use tubes for casting structural concrete pillars.

• Industrial Cores: For winding wide materials like carpet, vinyl flooring, fiberglass, textiles, and plastic film.

• Shipping and Storage: Heavy-duty packaging and storage containers for rolled materials, posters, and industrial parts.

• Specialty Construction: Used as structural elements in lightweight construction or as forms for circular walls.

• Pultrusion & Filament Winding Cores: In the composites industry.