Polyester film electrostatic adsorption system

Abstract

The invention discloses a polyester film electrostatic adsorption system which is characterized in that a lead-in shaft of a high-voltage lead-in device is mounted in a wheel seat, a winding wheel is mounted on the wheel seat through a rolling bearing, and the wheel seat is mounted on a base I embedded in an insulating frame body I; one end of the lead-in shaft extends into a mercury containing cavity I between the wheel seat and the base I, the other end of the lead-in shaft extends out of the wheel seat and is embedded into a center hole of a wheel cover installed on the winding wheel, and a high-voltage power panel connected with the base I through an internal circuit I is arranged on the insulation frame body I. A grounding shaft of the grounding device is installed in a shaft hole of a shaft seat, the shaft seat is installed on a base II embedded in an insulating frame body II, one end of the grounding shaft is embedded in a center hole of a shaft end cover installed at the shaft end of a rotating shaft, and the other end of the grounding shaft extends into a mercury containing cavity II formed between the shaft seat and the base II. A grounding wire plate connected with the base II through an internal circuit II is arranged on the insulating frame body II; reliable introduction of a high-voltage power supply and reliable grounding of the electrostatic adsorption system are realized.

Description

technical field [0001] The invention relates to production equipment for biaxially stretched stretched polyester films, in particular to an electrostatic adsorption system for polyester films. Background technique [0002] BOPET film (biaxially oriented polyester film) production line consists of raw material, extrusion, casting, longitudinal drawing, transverse drawing, traction, winding, slitting and other systems. When casting, the high-temperature melt is cast from the die head to the surface of the smooth, low-temperature, high-speed rotating cold drum. If there is no external force, on the one hand, the quenched die is not easy to attach to the surface of the cold drum. On the other hand, It is easy to infiltrate air between the die and the cold drum and reduce the heat transfer effect, thus seriously affecting the quality of the die, such as high crystallinity, uneven crystallization, large necking, and even water ripples and other defects. Therefore, the cast sheet ...

AI Technical Summary

Problems solved by technology

[0004] If the film is not attached well to the cold drum, defects such as static lines, lines or sporadic pinning points will be formed on the finished film. This is not allowed in many applications. If the electrostatic adsorption parameters are not adjusted properly, it will also cause high voltage. Faults such as discharge and broken electrode wire affect production efficiency

[0005] There are many factors that affect the effect of electrostatic adsorption, among which the stability of the high-voltage power supply is the main factor. Usually, the factor that causes the instability of the high-voltage power supply is not the unstable voltage of the power supply itself, but the unreliability of the high-voltage introduction device and the grounding device. Electrostatic adsorption Because the electrode wire and the cold drum are both rotating, the traditional electrostatic adsorption system high voltage introduction and grounding are conducted through the metal bearing to form the main electrostatic circuit. Since the ball surface of the bearing is covered by a thin layer of grease, and This layer of grease has a high resistivity, which makes it difficult to achieve reliable introduction and grounding of high-voltage introduction and grounding. When the resistance of the high-voltage electrostatic circuit is too large, the electrostatic adsorption effect is not good

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