Paper Tubes

详情

Paper tubes are engineered for structural integrity, with specifications that vary based on whether they are used for shipping, industrial winding, or retail packaging.
1. Key Dimensional Specifications
Dimensions are the most critical factors for compatibility with machinery and end-use protection.

* Inner Diameter (ID): Standard industrial sizes start at 0.*5" (*9mm) and go up to *4" (**0mm). The most common IDs for tape and film cores are 3" (*6mm) and 6" (**2mm).
* Wall Thickness: Ranges from 0.**0" (0.*5mm) for lightweight packaging to 0.**0" (*2.7mm) or more for heavy-duty industrial cores.
* Length: Tubes can be precision-cut as short as 0.*5" or manufactured in lengths exceeding *0 feet (9 meters).
* Tolerances: High-precision cores often maintain a tolerance of +/- 0.**0" on the ID and +/- 0.**5" on the length.

2. Material and Strength Specs

* Fiber Source: Primarily manufactured from Recycled Kraft Paperboard.
* Adhesives: Water-based PVA (Polyvinyl Acetate) or Sodium Silicate glues are used to bond layers.
* Crush Resistance (Side-to-Side): Measured in pounds per linear inch (PLI). High-strength tubes are designed to withstand several hundred pounds of pressure without deforming.
* Beam Strength: The resistance to bending under the weight of a wound material (like steel or heavy fabric).

3. Construction Methods

* Spiral Wound: Paper plies are wound at an angle around a stationary mandrel. This is the most efficient for long, continuous production.
* Convolute: Paper is wound straight (parallel) onto a rotating mandrel. This creates a perfectly smooth outer surface, ideal for labeling and very high crush resistance.

4. Packaging and Finishing Details
Packaging specifications ensure the tube is functional for its specific application:

* Internal Liners:
* Glassine/Parchment: For grease resistance.
   * Foil/Poly: For moisture and vapor barriers (common in food or chemical packaging).
   * Release Liners: Silicone-coated for easy removal of adhesive materials.
* External Wraps:
* Custom Printing: Offset or digital printing for branding.
   * Color-Coded Plies: Using dyed paper for easy inventory identification.
   * Embossed/Textured: For premium retail aesthetics.
* End Closures:
* Plastic/Metal Plugs: Friction-fit caps for shipping.
   * Crimped/Curled Ends: The tube wall itself is folded over to seal the tube.
   * Telescoping: A two-piece design where a slightly larger "cap" tube slides over a "body" tube.