What Is a Molded Core Plug?
Heavy industrial materials such as paper, plastic film, aluminum foil, textiles, cable, and steel strip are commonly wound into large rolls for storage and transportation. As roll weight increases, the paper tube at the center is subjected to tremendous radial pressure.
Without proper reinforcement, the tube can deform or collapse, resulting in damaged products, unstable stacking, interrupted production, and expensive logistics losses.
Molded core plugs are high-density compressed wood inserts that are pressed into both ends of paper tubes. They significantly improve load-bearing capacity, protect roll integrity, and ensure safe handling throughout manufacturing, warehousing, and global transportation.
Exceptional Strength
Supports heavy rolls without cracking, deformation, or tube collapse.
Export Friendly
Manufactured from compressed wood fibers. No ISPM-15 fumigation required.
Sustainable Material
Produced from recycled wood waste, reducing environmental impact.
Custom Dimensions
Available in various diameters and thicknesses for different paper tubes.
Complete Molded Core Plug Manufacturing Solution
We don't simply manufacture machines—we provide a complete production ecosystem, from biomass preparation to finished molded core plugs ready for global industrial applications.
Molded Wood Core Plug
High-density compressed wood core plugs designed for paper mills, film rolls, aluminum foil, textile rolls and cable reels.
Complete Production Line
Integrates crushing, drying, glue mixing, hydraulic molding and automated handling into one efficient manufacturing system.
Wide Industrial Applications
Suitable for paper, plastic film, aluminum foil, cable, textile, steel strip and many other roll products.
Molded Core Plug Specifications
Precision-engineered molded core plugs designed for industrial cable reel manufacturing. Dimensions shown below are typical production specifications and may vary slightly according to manufacturing tolerances.
| Size (Nominal) | Outer Diameter (Actual) | Inner Diameter (Actual) | Thickness | Weight (Range) |
|---|---|---|---|---|
| 100mm | 102.87 - 104.04mm | 28.07 - 28.83mm | 38.1mm (±3.175mm) | 0.18 - 0.22 KG |
| 150mm | 153.67 - 154.83mm | 51.31 - 51.81mm | 31.75mm (±3.175mm) | 0.39 - 0.54 KG |
| 200mm | 204.67 - 205.83mm | 51.31 - 51.81mm | 31.75mm (±3.175mm) | 0.64 - 0.73 KG |
| 250mm | 255.67 - 256.83mm | 76.71 - 77.21mm | 31.75mm (±3.175mm) | 1.09 - 1.18 KG |
| 300mm | 306.67 - 307.83mm | 53.09 - 76.45mm | 31.75mm (±3.175mm) | 1.54 - 1.81 KG |
ZK-1600 Molded Core Plug Machine
The ZK-1600 Compression Molding Machine is specifically designed for the efficient production of high-density wood core plugs. With its powerful molding pressure, the machine produces plugs with a density of 850–950 kg/m³, ensuring excellent strength and superior water resistance.
Key Specifications
- Raw Material: Wood chips
- Adhesive Type: MDI or UF resin
- Glue Ratio: 4.5%
- Maximum Diameter: 1200 mm
- Production Capacity: 1 plug / 4 min
The ZK-1600 is an ideal choice for manufacturers seeking stable quality, high durability, and reliable production efficiency.
Contact UsTurn Low-Cost Biomass into High-Value Molded Core Plugs
Our fully automated molded core plug production line enables manufacturers to convert recycled wood waste and agricultural biomass into premium industrial core plugs with high strength, excellent dimensional stability, and export-ready quality.
Flexible Raw Materials
Process sawdust, wood chips, bamboo, straw, bagasse, coconut coir, palm fiber and many other biomass materials.
Optimized Production
- Moisture below 8%
- 150°C hot pressing
- 20–30 min molding cycle
High Production Capacity
- 4" Plug — 156 pcs/batch
- 6" Plug — 42 pcs/batch
- 12" Plug — 12 pcs/batch
Complete Turnkey Line
- Wood Crusher
- Dryer
- Glue Mixer
- Hydraulic Press
Why Invest in a Molded Core Plug Production Line?
Global demand for sustainable industrial packaging continues to increase as paper, film, textile, and cable manufacturers seek stronger, eco-friendly alternatives. Producing molded core plugs in-house reduces packaging costs while creating a valuable new revenue stream.
✔ Free Project Consultation ✔ Custom Machine Layout ✔ Quotation within 24 Hours
Frequently Asked Questions (FAQ)
Q: What is a molded core plug machine used for?
A: It is specialized equipment that uses a hot-pressing molding process to compress wood fibers or biomass waste into high-density cylindrical inserts (core plugs) to protect heavy material rolls during transit.
Q: What raw materials can be used in this machine?
A: The machine processes wood waste like sawdust, wood shavings, and wood chips. It also handles non-wood fibers like bamboo, palm fiber, sugarcane bagasse, wheat straw, and coconut coir.
Q: What are the standard sizes of paper tube core plugs?
A: The standard sizes are 4-inch, 6-inch, and 12-inch. However, with our flexible mold systems, core plugs can be custom-made to virtually any outside diameter above 2 inches.
Q: Do molded wood core plugs require ISPM-15 fumigation?
A: No. Because they are made from engineered compressed wood under high heat and pressure, they are naturally pest-free and completely exempt from international fumigation regulations.
Q: What are the technical requirements for production?
A: The wood sawdust moisture must be below 8% before mixing with glue. The heating temperature must be at least 150°C, and the hot pressing time should be around 20 to 30 minutes per batch.
Q: How many pieces of core plugs can it produce per batch?
A: In a single molding cycle, our heavy-duty press machine can produce either 156 pieces of 4-inch plugs, 42 pieces of 6-inch plugs, or 12 pieces of 12-inch plugs.
