Phenolic paper tube: characteristics and applications

Introduction of phenolic paper tubes 

Phenolic paper tube is a kind of tubular laminated product made by impregnating phenolic resin with insulated coil paper and then baking and curing.

Phenolic paper tubes are engineered composite materials constructed from multiple layers of paper, typically kraft paper, which is renowned for its high tensile strength and durability. The kraft paper serves as the foundational base material, while phenolic resin acts as a powerful binding agent. The phenolic resin, a synthetic polymer known for its remarkable resistance to heat, chemicals, and wear, penetrates the paper fibers, creating a cohesive and unified structure. This impregnation process not only enhances the mechanical strength of the paper but also imparts additional properties such as electrical insulation and resistance to environmental stressors. The result is a lightweight yet incredibly strong tubular structure that can withstand significant mechanical loads and harsh operating conditions, making it a versatile material for various industrial applications.

Phenolic paper tubes main characteristics

High strength: Phenolic paper tube is impregnated and cured by phenolic resin. It has high mechanical strength and can withstand certain pressure and load.
Corrosion resistance: Phenolic resin has excellent corrosion resistance, so that phenolic paper tubes can maintain stable performance in a variety of harsh environments.
Good dielectric properties: Phenolic paper tubes have good dielectric properties in the dry state, so they are widely used in insulating structural parts of electrical equipment.
Heat resistance: Phenolic paper tubes can maintain stable performance within a certain temperature range, usually up to

130 ° C. The specific temperature range may vary depending on product specifications and manufacturing processes.

Main uses of phenolic paper tubes

The main uses of phenolic paper tubes are very wide, especially in the electrical and electronic fields, and its application as an insulating material is particularly prominent.
Electrical insulation:
·Because of its good insulation performance and heat resistance, phenolic paper tubes are often used as insulating structural parts in motors and electrical equipment.
·In transformers, phenolic paper tubes can be used for insulation between coils to ensure that current flows in the correct path and prevent short circuits.

Mechanical support and protection:

Phenolic paper tubes have a certain mechanical strength and can be used to support and protect electrical components such as wires and cables to prevent external damage.
·In some cases, the phenolic paper tube can also be used as a filler material to fill the gaps inside the equipment and improve the stability of the overall structure.

Thermal Management:

Because phenolic paper tubes have good heat resistance, they can maintain stable performance in high temperature environments. So they are often used in electrical components that need to withstand high temperatures.
·In some cases where heat dissipation is required, the phenolic paper tube can also be used as part of the heat dissipation channel to help the heat from the inside of the device.

In addition to the uses described above, phenolic paper tubes can also be used to make various electrical equipment brackets, partitions and other components to meet the application needs of different fields.

Manufacturing process

The manufacturing process of phenolic paper tube mainly includes resin synthesis, paper impregnation, heating, baking and curing. Among them, resin synthesis is the key step to prepare phenolic resin, paper impregnation is the phenolic resin uniformly coated on the paper. Heating, rolling, baking, curing is to roll the impregnated paper into a tube and cure it to form a phenolic paper tube with certain strength and properties.

Limitations and Considerations

While phenolic paper tubes offer numerous benefits, it’s important to consider their limitations. They may not be suitable for applications requiring extreme flexibility or transparency. In some cases, the cost of phenolic paper tubes might be higher than alternative materials, although this is often offset by their superior performance and longevity. It’s crucial to evaluate the specific requirements of each application to determine if phenolic paper tubes are the most suitable option.

Ztelec Group is a professional manufacturer of high-quality electrical insulation materials with more than sixty-five years of manufacturing experience. If you need more product information and quotes, please contact us.