Paper tubes and cores are used across hundreds of industries — textiles, film, paper, adhesive tape, packaging, and more. Despite being strong enough to carry heavy yarn packages or film rolls, paper tubes have one critical vulnerability: their edges. During handling and transport, the open ends of paper tubes are easily crushed, deformed or contaminated. Plastic end caps and plugs solve this problem simply, cost-effectively, and reliably.
Anupam Plastics & Allied Industries manufactures a comprehensive range of plastic end caps and plugs for paper tubes from Sangli, Maharashtra, India. This guide covers everything you need to know — from the nine standard sizes to polymer selection for specific load requirements.
What Are Plastic End Caps and Plugs?
A plastic end cap is a circular disc with a peripheral flange that fits over the outside of a paper tube or core end, protecting the edge from mechanical damage. A plastic plug fits into the inside of the tube bore, preventing collapse of the inner diameter during stacking or transportation.
End caps protect the outside edge of the tube. Plugs protect the inner bore. In heavy-duty applications, both are used simultaneously for maximum protection.
Key functions of plastic end caps and plugs:
- Prevent paper tube edge crushing during stacking and transport
- Maintain the internal diameter of the tube bore, ensuring the tube can still be loaded onto mandrels and winding spindles
- Protect against moisture ingress at the tube ends
- Enable safe stacking of paper tubes without edge-to-edge contact damage
- Provide a professional, finished appearance for retail and export packaging
Available Sizes
Anupam Plastics manufactures plastic end caps and plugs in the following nine standard sizes to cover the most commonly used paper tube and core dimensions in the textile and packaging industries:
| Size (mm) | Common Application |
|---|---|
| 54 mm | Small textile bobbins, narrow fabric cores |
| 55 mm | Standard spinning tube ends |
| 76 mm | Most common textile yarn tubes (3 inch cores) |
| 80 mm | Slightly larger 3-inch variants, adhesive tape cores |
| 99 mm | 4-inch cores, heavy fabric rolls |
| 105 mm | Industrial textile cores, winding tubes |
| 135 mm | Wide fabric rolls, paper industry cores |
| 151 mm | Heavy winding applications, industrial rolls |
| 165 mm | Large-diameter industrial cores |
Custom sizes are also available for OEM and large-volume orders. Contact Anupam Plastics with your tube bore dimension and required load capacity for a custom quote.
Polymer Grades
The right polymer grade depends on the weight the end cap needs to support and the environmental conditions in which it will be used:
- Standard polypropylene (PP): The most economical grade. Suitable for light to medium-weight yarn packages and standard shipping conditions.
- High-impact polypropylene (HIPP): Recommended for heavy packages (2 kg and above per tube) or applications involving rough handling in logistics.
- High-density polyethylene (HDPE): Offers superior moisture resistance for humid storage or maritime shipping. Preferred for export orders.
Anupam Plastics can advise on the optimal polymer grade for your specific application during the enquiry process.
Benefits and Applications
The benefits of using plastic end caps extend well beyond simple edge protection:
Key Benefits
- Cost reduction: End cap losses are far less expensive than replacing crushed paper tubes or rewinding damaged yarn packages.
- Export compliance: Many importing countries and buyers require paper tubes to be end-capped for ISPM-15 compliant packaging.
- Stacking efficiency: Protected tubes can be stacked higher in warehouses and containers, maximising storage density.
- Machine compatibility: Maintained bore dimensions ensure tubes load correctly onto mandrels and spindles without adjustment.
- Branding: Coloured end caps in brand-specific colours provide visual quality signalling in retail and premium yarn products.
Selection Tips
- Measure the outer diameter of your paper tube (for caps) or inner bore (for plugs) precisely — a 1 mm mismatch can cause the cap to fall off or deform the tube.
- Specify the maximum load the end cap must support during stacking (typically expressed in kg per stack level).
- For maritime or humid-climate export, specify HDPE over standard PP.
- If colour-coding your yarn packages by count or lot, choose a cap colour from Anupam Plastics' standard shades range.
Anupam Plastics Range
Anupam Plastics & Allied Industries has been supplying plastic end caps and plugs for paper tubes since 1984. Products are available in all nine standard sizes and multiple polymer grades. The company exports to textile and packaging customers in Indonesia, Bangladesh, Vietnam, Thailand, Sri Lanka and more than 50 countries worldwide.
Visit the product page or send an enquiry for pricing, availability and custom size quotes.
Frequently Asked Questions
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