Wholesale Spiral Tube Making Machine China

What is a Spiral Paper Tube Roll Core?

It's the cylindrical cardboard tube at the center of a roll of material. Its job is to provide a stable structure for winding, unwinding, shipping, and storing the rolled product. These cores are almost exclusively made using spiral winding technology because of its superior strength and consistency.

Why Spiral Winding is Ideal for Roll Cores:

1. Exceptional Radial Crush Strength: Prevents the core from collapsing under the tremendous tension of tightly wound materials (e.g., stretched plastic film or heavy textiles).

2. Consistent Straightness: Ensures the roll runs true and without vibration on high-speed machinery (e.g., in printing presses or converting equipment).

3. Excellent Torque Strength: Resists twisting forces during the winding and unwinding process.

4. Smooth Surface: Provides an even, seamless surface for the first layer of material to be wound onto.

How the Machine Makes Cores for Rolls

The process is identical to the general spiral tube process but is fine-tuned for core production:

1. Material Unwinding: Large rolls of high-strength kraft paper are loaded onto the unwind stand.

2. Precision Slitting: The kraft paper is slit into multiple narrow strips. The number of strips determines the wall thickness of the core (e.g., 4-ply, 6-ply).

3. Adhesive Application: Each strip is coated with a precise amount of strong adhesive.

4. Spiral Winding: The strips are wound at a steep angle (around 80-85 degrees) onto a rotating mandrel. The diameter of this mandrel defines the core's inner diameter (I.D.), which is a critical dimension for fitting onto a machine's shaft.

5. Pressing & Forming: Forming belts apply high pressure to create a solid, seamless wall structure.

6. Heat Curing: The tube passes through a drying oven to solidify the adhesive.

7. Precision Cutting: A flying saw cuts the continuous tube into specific lengths. This length becomes the core's face length, which determines the width of the roll (e.g., a 1-meter wide roll of carpet would need a 1-meter long core).

Key Machine Specifications for Core Making:

When buying a machine for this purpose, you focus on:

• Core Inner Diameter (I.D.) Range: The most critical spec. Must match the requirements of your customers' machinery (e.g., 3-inch cores for stretch film, 6-inch cores for carpet).

• Wall Thickness (Ply Count): Defines the core's durability. Heavier rolls require thicker walls (more plies).

• Maximum Core Face Length: The longest core you can produce, which dictates the widest roll you can serve.

• Production Speed: Directly impacts your daily output (measured in meters/minute).

• Paper Grade Compatibility: The machine must be able to handle the high-grammage kraft paper needed for strong cores.

End-Use Applications for Cores Made on This Machine

The cores produced are used across virtually every industry that deals with rolled goods:

• Packaging Industry: Cores for stretch wrap, shrink film, foil, and laminates.

• Textile Industry: Cores for yarn, thread, fabric, and carpet.

• Paper & Printing: Cores for newsprint, magazine paper, and industrial rolls of paper.

• Converting Industry: Cores for labels, tapes, and non-woven materials.

• Consumer Goods: The core inside rolls of plastic wrap, aluminum foil, wax paper, and paper towels in a consumer's home.