Preparation method of double-side metallized polypropylene capacitor film

A technology of polypropylene capacitors and double-sided metals, which is applied to fixed capacitor parts, laminated capacitors, fixed capacitor dielectrics, etc., can solve problems such as low yield, high scrap rate, and poor ability to withstand large currents. The effect of high yield and low cost

Active Publication Date: 2012-07-04
NINGBO GREAT SOUTHEAST WAN XIANG SCI & TECH
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AI Technical Summary

Problems solved by technology

[0004] At present, the metallized polypropylene capacitor film capacitors of the prior art generally use a single-sided metallized polypropylene capacitor film, that is, a polypropylene capacitor film in a single-sided corona treatment, but it has a major disadvantage of being durable The ability to withstand large currents is poor, because the single-layer metallized film layer is much thinner than the metal foil, and the ability to carry large currents is weak; to improve the shortcoming of metallized polypropylene capacitor film capacitors, there are two ways to improve : The first is to reduce the film width and increase the winding diameter, but the volume of the capacitor will increase accordingly, which is not conducive to the packaging of the circuit, and at the same time affects the developm

Method used

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Examples

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Example Embodiment

[0022] Example 1

[0023] A method for preparing a double-sided metallizable polypropylene capacitor film, which comprises the following steps:

[0024] 1) Raw materials: polypropylene raw materials with isotacticity ≥98.5% and ash content less than or equal to 20ppm, polypropylene particles produced by BOREALLS POLYMERS in Belgium;

[0025] 2) Extruding the cast sheet from the extruder: put the polypropylene raw material processed in step 1) into the extruder and extrude it into a sheet melt, and the temperature of the extruder is 230~265℃;

[0026] 3) Chilling roll and air shower cooling: the sheet melt prepared in step 2) is cooled and shaped by chilling roll and air shower to obtain thick sheet, the temperature of chilling roll is 90 ℃, and the thickness of thick sheet is the finished product. 9 times the thickness;

[0027] 4) Longitudinal stretching: the thick sheet obtained in step 3) is subjected to longitudinal preheating, stretching and shaping in sequence, the pre...

Example Embodiment

[0035] Example 2

[0036] A method for preparing a double-sided metallizable polypropylene capacitor film, which comprises the following steps:

[0037] 1) Raw materials: polypropylene raw materials with isotacticity ≥98.5% and ash content less than or equal to 20ppm, polypropylene particles produced by BOREALLS POLYMERS in Belgium;

[0038] 2) Extruding the cast sheet from the extruder: put the polypropylene raw material processed in step 1) into the extruder and extrude it into a sheet melt, and the temperature of the extruder is 230~265℃;

[0039] 3) Chilling roll and air shower cooling: the sheet melt prepared in step 2) is cooled and shaped by chilling roll and air shower to obtain thick sheet, the temperature of chilling roll is 100 ℃, and the thickness of thick sheet is the finished product 10 times the thickness;

[0040] 4) Longitudinal stretching: the thick sheet obtained in step 3) is subjected to longitudinal preheating, stretching and shaping in sequence, the pr...

Example Embodiment

[0047] Example 3

[0048] A method for preparing a double-sided metallizable polypropylene capacitor film, which comprises the following steps:

[0049] 1) Raw materials: polypropylene raw materials with isotacticity ≥98.5% and ash content less than or equal to 20ppm, polypropylene particles produced by BOREALLS POLYMERS in Belgium;

[0050] 2) Extruding the cast sheet from the extruder: put the polypropylene raw material processed in step 1) into the extruder and extrude it into a sheet melt, and the temperature of the extruder is 230~265℃;

[0051] 3) Chilling roll and air shower cooling: the sheet melt prepared in step 2) is cooled and shaped by chilling roll and air shower to obtain thick sheet, the temperature of chilling roll is 108 ℃, and the thickness of thick sheet is the finished product 11 times the thickness;

[0052] 4) Longitudinal stretching: the thick sheet obtained in step 3) is subjected to longitudinal preheating, stretching and shaping in sequence, the pr...

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Abstract

A preparation method of a double-sided metallized polypropylene capacitor film includes steps: firstly, preparing raw materials; secondly, using an extruder to extrude cast sheets; thirdly, using chilling rollers and air showering for cooling; fourthly, longitudinally stretching; fifthly, transversely stretching; sixthly, performing thickness measurement, edge cutting and corona treatment; seventhly, winding; eighthly, aging for the first time; ninthly, slitting; and tenthly, aging for the second time. The polypropylene capacitor film is subjected to double-side corona treatment during coronatreatment, the polypropylene capacitor film subjected to double-side corona treatment is further subjected to double-side metallized coating in the subsequent evaporation procedure, and since two sides of the polypropylene capacitor film are coated with metallized coatings, the thickening of the metallized coatings is not needed while the packaging size is not increased and the high-current bearing capacity of a prepared capacitor is not increased. In addition, the thickness of the double-sided corona polypropylene capacitor film with double-side metallized coatings is equal to that of an original polypropylene capacitor film with a single-side metallized coating, so that the problems of nonuniform thickness and proneness to disjointing are avoided, yield is high, and prepared capacitors are low in cost.

Description

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Claims

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Application Information

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Owner NINGBO GREAT SOUTHEAST WAN XIANG SCI & TECH
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