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"Inductance coil is widely used in the electrical industry." resistance to high frequency and connection to low frequency "is the main feature of inductance coil. High frequency signal will encounter great resistance when passing through the inductance coil, which is difficult to pass. However, the resistance to low frequency signal when passing through it is small. The resistance of the inductance coil to DC is almost zero, which has a significant blocking effect on the communication current."

Generally speaking, the wire winding the inductance coil always has a certain resistance. Generally, this resistance is very small and can be neglected. However, when the current flowing through some circuits is large, the small resistance of the coil can not be neglected, because a large current will consume power on the coil, causing the coil to heat up or even burn out. Therefore, sometimes the electrical power that the coil can accept should be considered.

It can be seen that the plastic coil framework is one of the key parts of electrical protection products.

It is necessary to satisfy the following requirements for the data used for the coil framework:

● capable of withstanding the maximum coil temperature

● excellent insulation function

● convenient for processing and forming

Special modified PBT for coil frame features:

1. High grade flame retardant

For general electronic products, in terms of data selection, special attention is paid to its fire prevention function. Selecting high-level fire prevention data is of great significance to improve product safety level and prevent fire.

Especially for the information about the coil framework, when the coil current winding the framework is too large, it will often cause the coil to heat up or even burn out. The information that the flame retardant level cannot meet the requirements will inevitably have certain potential safety hazards

The special modified PBT for the coil framework can reach the level of 0.38mmv0, ensuring the safety of the coil framework for safe use.

2. High CTI

Comparativetracking index (CTI): the highest voltage value that the data surface can withstand 50 drops of electrolyte (0.1% ammonium chloride aqueous solution) without forming leakage traces. Polymer insulation materials have a special phenomenon of electrical damage, that is, the surface of polymer insulation materials will deteriorate under specific conditions, and can lead to electrical damage.

As for the products used in some electronic components such as coil framework, they have high requirements for CTI value. The specially modified PBT for coil frame not only has excellent flame retardancy, but also has excellent leakage trace index, which can reach 250V, and has excellent safety function.

3. High mechanical function

General electronic products do not pay special attention to the mechanical function in the selection of data, but for some special parts, if the mechanical function is lacking, the parts will be cracked or brittle. Therefore, it is of great significance for customers to prevent the use of defective products and improve the mechanical function of products.

4. High liquidity

For a piece of information, outstanding fluidity means easy processing and molding, lower processing temperature, lower injection pressure and lower power loss. Especially for the "the first mock examination with multiple holes" products such as relays, capacitor shells and coil frames, selecting a material with good liquidity will be more beneficial to injection molding and prevent the parts from being dissatisfied or defective due to lack of liquidity. The specially modified PBT for coil framework has excellent fluidity and processing function.

Article source: PBT engineering plastics http://www.xrtsm.com.cn/