In the modern electrical and electronic industry, insulation materials play a key role. Phenolic paper sheet is widely used due to its excellent comprehensive performance and economic practicality. This article will deeply analyze its characteristics, industry application and future development trends, and provide technical and market information for relevant practitioners.
Phenolic paper sheet is a laminated composite material made of insulating impregnated paper impregnated with phenolic resin, baked and hot pressed. phenolic paper sheet has many names in the industry, such as bakelite, phenolic laminate sheet, etc. With the improvement of environmental protection requirements, halogen-free flame-retardant phenolic paper sheet came into being. It adopts a new flame retardant system, which not only maintains flame retardant properties but also complies with environmental regulations. In the market, the performance and price of phenolic paper sheet are between ordinary plastics and high-end composite materials, and it plays an important role in many industrial fields. It is particularly suitable for scenarios where electrical performance, mechanical strength and cost-effectiveness need to be taken into account.
As an insulating material, phenolic paper sheet has good electrical properties and can effectively prevent breakdown under high voltage environment. When used in transformer oil, its insulation performance is not affected, and its arc resistance can be improved, which is suitable for oil-immersed electrical equipment. Its dielectric constant and dielectric loss factor are low, which can meet the needs of most medium and low frequency electrical equipment, and its electrical performance is stable in a humid environment.
Phenolic paper sheet has excellent mechanical properties and high strength. It can not only be used as an insulating material, but also undertake certain structural support functions. Its surface is smooth and hard, with good wear resistance, which is suitable for PCB drilling pads. At the same time, it has good creep resistance and stable dimensions under long-term load.
In high temperature environment, paper phenolic sheet has good stability. When encountering fire, its surface will carbonize to form an insulation layer to prevent the spread of flames. Phenolic paper sheet has excellent flame retardant properties, no droplets when burning, low smoke release and almost no toxic gas, and high safety.
Phenolic paper sheet has good resistance to a variety of chemicals, especially transformer oil, lubricating oil and most solvents. It can also resist corrosion by weak acids and weak bases, and is suitable for a variety of industrial environments. In a humid environment, it can maintain dimensional stability and has good weather resistance, and can be used for outdoor electrical equipment.
Phenolic paper sheet is widely used in the industrial field due to its unique combination of properties, covering electrical equipment, electronics industry, industrial machinery and other fields. Understanding these application examples will help engineers choose phenolic laminate paper sheet reasonably when designing new products.
Phenolic paper sheet is an important insulation material in power transmission and distribution systems. Large oil-immersed transformers use phenolic paper sheet to make insulating spacers and end supports between windings. These parts need to withstand long-term immersion in high-voltage electric fields and transformer oil at the same time. The oil resistance and high dielectric strength of phenolic paper sheet meet the use requirements. In high-voltage circuit breakers and switchgear, baffles, partitions and arc extinguishing chamber components made of phenolic paper sheet can prevent the formation of carbonization paths when the equipment is short-circuited with excellent arc resistance, ensuring the safe operation of the power system.
In the manufacture of motors and generators, phenolic paper sheet is used to produce slot wedges, end support rings and interphase insulators. These insulating parts must have good insulation properties and withstand the centrifugal force generated by electromagnetic vibration and high-speed rotation. In variable frequency motors, since the high frequency component of pulse voltage is prone to cause corona discharge, phenolic paper sheet has better corona resistance than ordinary plastics.
In the electronics industry, phenolic paper sheet is mainly used in PCB manufacturing and electronic testing equipment. The multi-layer PCB drilling process requires a support material with moderate hardness, good thermal conductivity and no damage to the drill bit. Phenolic paper sheet can reduce drilling burrs and extend the service life of the drill bit. In addition, in the production of electronic testing equipment such as ICT (in-circuit test) fixtures and functional test fixtures, the stable electrical performance and mechanical processing performance of phenolic paper sheet provide guarantees for mass production testing of electronic products.
Phenolic paper sheet is widely used in industrial machinery and equipment due to its excellent mechanical properties and strong wear resistance. Paper phenolic sheet is used to make gears, bearing cages and guide rails of textile machinery. Compared with metal parts, it has the advantages of light weight, low noise and self-lubrication. Phenolic paper sheet is also often used for wear-resistant linings and mold splints of packaging machinery. Its high hardness and low friction coefficient can extend the service life of the equipment.
In the field of mold manufacturing, phenolic paper sheet is used as mold pads, stripper plates and positioning plates in injection molding and stamping processes. These parts need to have high dimensional stability and compressive strength to withstand repeated mechanical stress. Using phenolic paper sheet to make trial molds or small batch production molds can reduce costs and shorten production cycles. In addition, the insulation material is also commonly used for the pads of table grinders. Its flat surface and moderate hardness are suitable for precision grinding operations.
In the field of rail transportation, phenolic paper sheet is used for insulating support plates, terminal blocks and partitions in the distribution boxes of high-speed rail and subway vehicles. In addition to meeting electrical insulation requirements, these components must also withstand vibration, humidity and temperature changes during vehicle operation. The environmental resistance of phenolic paper sheet makes it suitable for such harsh working conditions.
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