Spiral Tube Making Machine China Manufacturer

Core Concept: How Spiral Winding Works

Unlike parallel winding, a spiral tube machine feeds multiple narrow strips of paper at a constant, oblique angle (typically 70° to 85°) onto a rotating mandrel. This creates a continuous, helical-wound tube with a characteristic spiral seam.

This method is renowned for producing tubes with exceptional radial strength (crush resistance) and consistency.

The Machine Breakdown: Key Components

A spiral tube machine is a linear production system. Here's how the components work together:

1. Unwind Stand(s): Holds the large master rolls of paper (e.g., kraft, recycled, specialty papers). A machine can have multiple unwind stands to allow for different paper grades or automatic splicing for non-stop production.

2. Slitting Unit: Sharp, precision blades slit the wide paper rolls into multiple narrow strips. The number of strips equals the number of plies (layers) in the final tube wall.

3. Gluing System: Each paper strip passes over a glue applicator roller, receiving a precise and even coat of adhesive (commonly water-based PVA or synthetic resins).

4. Winding Bridge & Mandrel:

   • Mandrel: A long, polished steel shaft that defines the tube's inner diameter. It is the "heart" around which the tube is formed.

   • Winding Bridge: Guides the glued paper strips onto the rotating mandrel at the fixed spiral angle.

5. Forming Belts: A series of specialized belts wrap around the forming tube on the mandrel. They apply consistent pressure, ensuring the paper plies bond tightly and excess glue is squeezed out for a smooth, solid wall.

6. Drying/Curing Section: The continuous tube moves into a heated tunnel where circulating hot air rapidly cures the adhesive, locking the tube into its final, rigid structure.

7. Cutting Unit (Flying Saw): A synchronized saw that moves with the traveling tube, cutting it to pre-set lengths without stopping the production line. This ensures high efficiency.

8. Control System (PLC & HMI): The brain of the machine. A Programmable Logic Controller and Human-Machine Interface (touchscreen) allow the operator to set all parameters (length, speed, glue amount) and monitor the entire process.

Advantages of Spiral Tube Technology

• Superior Crush Resistance: The spiral structure distributes stress evenly, making it ideal for heavy-duty industrial cores.

• Excellent Straightness & Dimensional Stability: The process inherently produces very straight and consistent tubes.

• High Production Efficiency: Capable of continuous, high-speed operation with minimal downtime.

• Wide Range of Sizes: By changing the mandrel, a single machine can produce a vast range of inner diameters.

• Material Flexibility: Can handle various paper grades and even incorporate materials like films or foils into the tube wall.