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Neutralizing device, neutralizing method and production method of electric-insulating sheet

An electrical insulation and sheet technology, applied in corona discharge devices, electrical components, static electricity, etc., can solve the problems of uneven positive and negative charging, uneven adhesion of ink or coating agent, and inability to eliminate static spots.

Inactive Publication Date: 2008-01-23
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The second problem is that due to the use of AC voltage, unevenness in positive and negative charging occurs in the sheet S along the moving direction of the sheet S, corresponding to the polarity of the forcedly irradiated ions.
In the prior art, problems such as the occurrence of electrostatic spots after coating processes such as vacuum deposition or sputtering, fretting failure of slices caused by poor sliding, or uneven adhesion of ink or coating agent cannot be eliminated.

Method used

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  • Neutralizing device, neutralizing method and production method of electric-insulating sheet
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  • Neutralizing device, neutralizing method and production method of electric-insulating sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0391] In the static elimination device 5 shown in FIG. 5 , a biaxially stretched polyethylene terephthalate film S (Lumira-38S28 manufactured by Toray Co., Ltd.; Film A-1) As an electrically insulating sheet S, the film S was moved at the speed u [unit: m / min] shown in Table 1. For the raw film A-1, as shown in FIG. 10 , periodic charging was performed at a period of 1.1 to 1.2 mm along the moving direction of the film S within a range of 10 mm in the width direction of the film S as shown in FIG. 10 .

[0392] Arrow TD in FIG. 10 indicates the width direction of the film S, and arrow MD indicates the moving direction of the film S. As shown in FIG. The distribution of the equilibrium potential on the back surface of the first surface of the periodically charged part (the AA' portion in FIG. 10 ) is shown in FIG. 11 , which is along the moving direction of the thin film S, centered at 0 V, and has an amplitude of 270 V (charges on each surface Density amplitude of 190μC / m 2...

Embodiment 2

[0420] In the static elimination device 5 shown in FIG. 5 , a biaxially stretched polyethylene terephthalate film S (Lumira-75T10 manufactured by Toray Co., Ltd., manufactured by Toray Co., Ltd. Film B and raw film C) were used as the electrical insulating sheet S, and the film S was moved at 300 m / min.

[0421] The raw film B is a film that is charged so that positive and negative charges are alternately arranged at a period of 5 mm along the moving direction of the film S on the first surface of the film S, and the absolute values ​​of the positive and negative peaks of the equilibrium potential on the back surface Up to 560V (480 to 560V), i.e., the amplitude of the charge density is up to 396μC / m 2 (340 to 396μC / m 2 ), at the same position in the in-plane direction, the polarity of the first surface and the polarity of the second surface of the thin film S are opposite polarities, and the equilibrium potential of the first surface and the equilibrium potential of the seco...

Embodiment 3

[0429] Apply a positive voltage to the first ion generating electrode (apply negative voltage to the second ion generating electrode) from the most upstream (first) to the sixth static elimination unit in the moving direction of the film S, and the potential difference between the ion generating electrodes is positive, and the potential difference between the ion generating electrodes is positive. The seventh and eighth static elimination units were the same as in Example 2 except that a negative voltage was applied to the first ion generating electrodes (a positive voltage was applied to the second ion generating electrodes), and the potential difference between the ion generating electrodes was negative. Table 2 shows the results of static elimination evaluation of the raw film B and the raw film C.

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Abstract

A neutralizing device for an electric-insulating sheet comprising at least two neutralizing units provided on the moving route of an electric-insulating sheet at intervals in the moving direction of the sheet, each neutralizing unit having a first electrode unit disposed on the first surface side of the sheet and a second electrode unit disposed on the second surface side of the sheet, the first electrode unit having a first ion generating electrode, the second electrode unit having a second ion generating electrode disposed facing the first ion generating electrode, wherein, in each neutralizing unit, the first ion generating electrode and the second ion generating electrode are so related as to be given a dc inter-ion-generating-electrode potential difference, and, when a total number of the neutralizing units is n (n: integer of at least two), the inter-ion-generating-electrode potential difference in at least n / 4 (fractional portion rounded up) neutralizing units out of n neutralizing units and the inter-ion-generating-electrode potential difference in the other neutralizing units are in mutually-reverse-polarity potential difference relation.

Description

technical field [0001] The invention relates to a static elimination device, a static removal method and a manufacturing method of an electrical insulating sheet. Background technique [0002] Electrification in electrically insulating sheets such as plastic films hinders processing of the sheet in the process of processing the sheet. As a result, the quality of the processed product may not be as expected. For example, when printing or coating agent coating is performed on a sheet having local strong charging or discharge marks caused by electrostatic discharge, the resulting processed product has uneven adhesion of ink or coating agent. In the manufacturing process of metal cover films for capacitors and packaging, after coating processes such as vacuum deposition or sputtering, electrostatic spots may appear in processed products. The strong electrification in the portion where the static spot is present causes the film to adhere to other parts due to the electrostatic ...

Claims

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Application Information

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IPC IPC(8): H05F3/04H01T19/04H01T23/00
Inventor 平井康之森冈聪子田中治美
Owner TORAY IND INC
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