CA1089041A - Method of manufacturing a capacitor roll, and a capacitor comprising a roll thus manufactured - Google Patents
Method of manufacturing a capacitor roll, and a capacitor comprising a roll thus manufacturedInfo
- Publication number
- CA1089041A CA1089041A CA270,917A CA270917A CA1089041A CA 1089041 A CA1089041 A CA 1089041A CA 270917 A CA270917 A CA 270917A CA 1089041 A CA1089041 A CA 1089041A
- Authority
- CA
- Canada
- Prior art keywords
- capacitor
- vacuum container
- foil
- roll
- dielectric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000011888 foil Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 229920002994 synthetic fiber Polymers 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims 4
- 239000003989 dielectric material Substances 0.000 claims 2
- 239000000463 material Substances 0.000 claims 1
- 230000015556 catabolic process Effects 0.000 abstract description 6
- 238000005470 impregnation Methods 0.000 abstract description 5
- 229920000728 polyester Polymers 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- QHGVXILFMXYDRS-UHFFFAOYSA-N pyraclofos Chemical compound C1=C(OP(=O)(OCC)SCCC)C=NN1C1=CC=C(Cl)C=C1 QHGVXILFMXYDRS-UHFFFAOYSA-N 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
- H01G13/04—Drying; Impregnating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/20—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06
- H01G4/22—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06 impregnated
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
ABSTRACT:
For the manufacture of capacitor rolls for wound capacitors, the impregnation is performed by subjecting the dielectric foils on their stock rolls to an impregnating treatment in vacuum. The capacitors manufactured from the capacitor rolls thus obtained have a comparatively high breakdown voltage. The manu-facture of the complete capacitor is no longer inter-rupted for an impregnation treatment.
For the manufacture of capacitor rolls for wound capacitors, the impregnation is performed by subjecting the dielectric foils on their stock rolls to an impregnating treatment in vacuum. The capacitors manufactured from the capacitor rolls thus obtained have a comparatively high breakdown voltage. The manu-facture of the complete capacitor is no longer inter-rupted for an impregnation treatment.
Description
The invention relates to a method of manufactur-ing a capac;tor roll in which metallized dielectric foils of synthetic material or metal foils together with dielectric foils of synthetic material which are present on stock rolls are wound without a moisture-absorbing intermediate layer, in order to form a capacitor roll, the dielectric foils being provided with an imprenating agent.
The following methods of impregnating foil capacitors are known:
a) the capacitor rolls are impregnated ;n a vacuum contain-er after winding. This method is comparatively time-consuming, whilst, moreover, the manufacturing process of the capacitors is interrupted;
b) it is known to provide the impregnating agent on both sides oF the dielectric foils during w;nding. This can be effected either by spraying or in a bath containing an impregnating agent and wherethrough the foil is transported. A method of impregnating of this kind involves the risk of air being trapped between the dielectric foil and the impregnating central layer, which may cause reiects due to ionization. Moreover, it is not simple to provide a comparatively thin layer of i~pregnating agent according to this method:
.
The following methods of impregnating foil capacitors are known:
a) the capacitor rolls are impregnated ;n a vacuum contain-er after winding. This method is comparatively time-consuming, whilst, moreover, the manufacturing process of the capacitors is interrupted;
b) it is known to provide the impregnating agent on both sides oF the dielectric foils during w;nding. This can be effected either by spraying or in a bath containing an impregnating agent and wherethrough the foil is transported. A method of impregnating of this kind involves the risk of air being trapped between the dielectric foil and the impregnating central layer, which may cause reiects due to ionization. Moreover, it is not simple to provide a comparatively thin layer of i~pregnating agent according to this method:
.
- 2 -.
i,. .
~La~8 9~ L PHD 76-029 c) it is known to impregnate a moisture-absorbing paper strip which is processed, together with the dielectric foils, to form a capacitor roll. The additional paper layer, however, causes increased dimensions of the capacitor roll.
The invention has fnr its object to perform die/~c7L~jc the impregnation of the ~We~e~trt foils during the manufacture of capacitor rolls in a simple manner without an additional moisture absorbing intermediate layer and without the manufacturing process of the complete capacitors to be manufactured from the rolls thus obtained being adversely affected.
To this end, the invention is characterized in that the dielectric foils are impregnated in vacuum on their stock rolls.
The impregnation of the foils still present on stock rolls is effected prior to the start of the actual production of the capacitor roll. Asa result of this vacuum impregnation treatment, a very thin layer of imprenating agent without air inclusions is obtained between the turns of the foil rolls. Con-secutively, capacitor rolls are manufactured in the usual manner from the foil rolls thus impregnated.
The invention will be described in detail hereinafter with reference to a preferred embodiment.
:
~ .
1(~89~)4 ~ PHD . 7 6--O 2 9 .
The polyester foil rolls required for the manufacture of polyester foil wound capacitors (two 8-/u polyester foils and two 5-/u aluminium foils) are sub-jected in the delivery condition, i.e. on the stock rolls, to a heat tr~atment in an empty vacuum container for 10 to 20 minutes at a temperature of between 50C and 60C.
Meanwhile, the silicon oil to be used as the impregnat-ing agent is degassed in a stock container in a vacuum of 0.5 Torr. ConsecutiveIy, the foil rolls are evacuated for 30 minutes to 0.01 Torr in the vacuum container. Sub-sequently, the vacuum holder is filled with the previ-ously degassed silicon oil. The stock rolls are removed ~;
from the impregnating bath after at least 15 minutes, preferably 20 to 30 minutes.
The dielectric foils thus manufactured have been used to form, in conjunction with metal foils, capa-citor~rolls in the usual manner, and have been compared with~capacitor rolls without impregnated polyester foils.
The breakdown strength of the capacitor rolls comprising the polyester foil impregnated in accordance with the invention amounted to 2430 V, whilst the breakdown strength of the capacitor rolls comprising the non-impregnated polyester foils amounted to 1725 V. The breakdown strength~of corresponding capacitor rolls having a non-impregnated 12-~u polyester foiI amounts ~to 2400 V. This aemonstrates that the 8-/u foils impreg-; ~ nated by the method in accordance with the invention havs ~ ' 4 ~:
~, ~ . ' ~ . , - , PHD.-76~029.
19-1-1977.
the same breakdown strength as non-impregnated 12-/u foils.
~ Also the number.o~ weak spots (the number of electrical breakdowns through the foils when a test vol-tage of 1800 V is applied) of the dielectric foil is substantially redueed by the impregnating treatment in accordance with the inv0ntion. .
For example, silicon oil or wax can be used as the impregnating agent. The dielec-tric foils can be made of poIypropylene, polyester, polycarbonate or poly-styrol. The dielectric foils may be metallized. Use can alternatively be made of separate metal foils. Due to the thinner i~termediate impregnating layer, the capa~
eitors manufaetured in accordance with the invention : : have n higher capacitance relative to the capacitors impregnated i~ aceordance with the kn!~wn methods, and al~o show a substantial capacitance increase relative to non-impregnated capacitors because, for example, silicon oil has a dieleetrie eonstant o~ 2.5.l:~
Il .
- Ij : ' 7 : ' . 1 ~: ` . ' ~ ' ` ' . ; ' .
: ~: ' ' ' ,
i,. .
~La~8 9~ L PHD 76-029 c) it is known to impregnate a moisture-absorbing paper strip which is processed, together with the dielectric foils, to form a capacitor roll. The additional paper layer, however, causes increased dimensions of the capacitor roll.
The invention has fnr its object to perform die/~c7L~jc the impregnation of the ~We~e~trt foils during the manufacture of capacitor rolls in a simple manner without an additional moisture absorbing intermediate layer and without the manufacturing process of the complete capacitors to be manufactured from the rolls thus obtained being adversely affected.
To this end, the invention is characterized in that the dielectric foils are impregnated in vacuum on their stock rolls.
The impregnation of the foils still present on stock rolls is effected prior to the start of the actual production of the capacitor roll. Asa result of this vacuum impregnation treatment, a very thin layer of imprenating agent without air inclusions is obtained between the turns of the foil rolls. Con-secutively, capacitor rolls are manufactured in the usual manner from the foil rolls thus impregnated.
The invention will be described in detail hereinafter with reference to a preferred embodiment.
:
~ .
1(~89~)4 ~ PHD . 7 6--O 2 9 .
The polyester foil rolls required for the manufacture of polyester foil wound capacitors (two 8-/u polyester foils and two 5-/u aluminium foils) are sub-jected in the delivery condition, i.e. on the stock rolls, to a heat tr~atment in an empty vacuum container for 10 to 20 minutes at a temperature of between 50C and 60C.
Meanwhile, the silicon oil to be used as the impregnat-ing agent is degassed in a stock container in a vacuum of 0.5 Torr. ConsecutiveIy, the foil rolls are evacuated for 30 minutes to 0.01 Torr in the vacuum container. Sub-sequently, the vacuum holder is filled with the previ-ously degassed silicon oil. The stock rolls are removed ~;
from the impregnating bath after at least 15 minutes, preferably 20 to 30 minutes.
The dielectric foils thus manufactured have been used to form, in conjunction with metal foils, capa-citor~rolls in the usual manner, and have been compared with~capacitor rolls without impregnated polyester foils.
The breakdown strength of the capacitor rolls comprising the polyester foil impregnated in accordance with the invention amounted to 2430 V, whilst the breakdown strength of the capacitor rolls comprising the non-impregnated polyester foils amounted to 1725 V. The breakdown strength~of corresponding capacitor rolls having a non-impregnated 12-~u polyester foiI amounts ~to 2400 V. This aemonstrates that the 8-/u foils impreg-; ~ nated by the method in accordance with the invention havs ~ ' 4 ~:
~, ~ . ' ~ . , - , PHD.-76~029.
19-1-1977.
the same breakdown strength as non-impregnated 12-/u foils.
~ Also the number.o~ weak spots (the number of electrical breakdowns through the foils when a test vol-tage of 1800 V is applied) of the dielectric foil is substantially redueed by the impregnating treatment in accordance with the inv0ntion. .
For example, silicon oil or wax can be used as the impregnating agent. The dielec-tric foils can be made of poIypropylene, polyester, polycarbonate or poly-styrol. The dielectric foils may be metallized. Use can alternatively be made of separate metal foils. Due to the thinner i~termediate impregnating layer, the capa~
eitors manufaetured in accordance with the invention : : have n higher capacitance relative to the capacitors impregnated i~ aceordance with the kn!~wn methods, and al~o show a substantial capacitance increase relative to non-impregnated capacitors because, for example, silicon oil has a dieleetrie eonstant o~ 2.5.l:~
Il .
- Ij : ' 7 : ' . 1 ~: ` . ' ~ ' ` ' . ; ' .
: ~: ' ' ' ,
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of manufacturing a capacitor roll com-prising the steps of:
- heating a stock roll of metallized dielectric foil of synthetic material (without a moisture-absorb-ing intermediate layer) in a vacuum container;
- reducing the pressure in said vacuum container;
- filling said vacuum container with a degassed impregnating agent;
- exposing said metallized dielectric foil in said vacuum container to said impregnating agent; and - subsequently utilizing said metallized dielectric foil to form a capacitor roll.
- heating a stock roll of metallized dielectric foil of synthetic material (without a moisture-absorb-ing intermediate layer) in a vacuum container;
- reducing the pressure in said vacuum container;
- filling said vacuum container with a degassed impregnating agent;
- exposing said metallized dielectric foil in said vacuum container to said impregnating agent; and - subsequently utilizing said metallized dielectric foil to form a capacitor roll.
2. A method of manufacturing an impregnated die-lectric foil for a capacitor roll comprising the steps of:
- heating a stock roll of synthetic dielectric foil material without a moisture absorbing intermediate layer, in a vacuum container;
reducing the pressure in said vacuum container;
- filling said vacuum container with a degassed impregnating agent;
- exposing said synthetic dielectric material in said vacuum container to said impregnating agent; and - subsequently utilizing said dielectric material wound with a metal foil to form a capacitor roll.
- heating a stock roll of synthetic dielectric foil material without a moisture absorbing intermediate layer, in a vacuum container;
reducing the pressure in said vacuum container;
- filling said vacuum container with a degassed impregnating agent;
- exposing said synthetic dielectric material in said vacuum container to said impregnating agent; and - subsequently utilizing said dielectric material wound with a metal foil to form a capacitor roll.
3. A method as defined in claim 1 or 2, where said heating step takes place at a temperature of between 50° and 60°C, said pressure is reduced to approx-imately 0.01 Torr, and said dielectric foil is exposed to said impregnating agent for at least 15 minutes.
4. A method as claimed in claim 1 or 2, wherein said heating step takes place at a temperature of between 50° and 60°C, said pressure is reduced to approximately 0.01 Torr, and said dielectric foil is exposed to said impregnating agent for a period of time in the range of 20 to 30 minutes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762605663 DE2605663C2 (en) | 1976-02-13 | 1976-02-13 | Process for manufacturing electrical wound capacitors |
| DEP.2605663.3 | 1976-02-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1089041A true CA1089041A (en) | 1980-11-04 |
Family
ID=5969743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA270,917A Expired CA1089041A (en) | 1976-02-13 | 1977-02-02 | Method of manufacturing a capacitor roll, and a capacitor comprising a roll thus manufactured |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5298964A (en) |
| BE (1) | BE851373A (en) |
| CA (1) | CA1089041A (en) |
| DE (1) | DE2605663C2 (en) |
| FR (1) | FR2341189A1 (en) |
| IT (1) | IT1072690B (en) |
| NL (1) | NL7701286A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3312076A1 (en) * | 1983-04-02 | 1984-10-04 | O.D.A.M. - Office de Distribution d'Appareils Médicaux, Wissembourg | HIGH ENERGY DENSITY CAPACITOR AND METHOD FOR PRODUCING THE SAME |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE443322C (en) * | 1925-04-03 | 1927-04-25 | Aeg | Process for the manufacture of capacitors |
| DE601588C (en) * | 1929-03-03 | 1934-08-21 | Siemens Schuckertwerke Akt Ges | Process for the production of wound capacitors, the material of which is soaked with an insulating agent before winding |
| FR1304785A (en) * | 1961-10-30 | 1962-09-28 | Licentia Gmbh | Process for manufacturing capacitor bushings |
| US3737961A (en) * | 1971-12-08 | 1973-06-12 | Mc Graw Edison Co | Method of making an impregnated plastic dielectric capacitor |
| DE2403125A1 (en) * | 1974-01-23 | 1975-07-31 | Philips Patentverwaltung | Capacitor with electrode foils and heat-shrinking dielectric foils - is produced by heat treatment and impregnation of wound roll |
-
1976
- 1976-02-13 DE DE19762605663 patent/DE2605663C2/en not_active Expired
-
1977
- 1977-02-02 CA CA270,917A patent/CA1089041A/en not_active Expired
- 1977-02-08 NL NL7701286A patent/NL7701286A/en not_active Application Discontinuation
- 1977-02-10 JP JP1316677A patent/JPS5298964A/en active Granted
- 1977-02-10 IT IT6730477A patent/IT1072690B/en active
- 1977-02-11 BE BE174897A patent/BE851373A/en unknown
- 1977-02-11 FR FR7703844A patent/FR2341189A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE2605663A1 (en) | 1977-08-18 |
| FR2341189A1 (en) | 1977-09-09 |
| FR2341189B1 (en) | 1983-04-29 |
| IT1072690B (en) | 1985-04-10 |
| JPS6142407B2 (en) | 1986-09-20 |
| BE851373A (en) | 1977-08-11 |
| JPS5298964A (en) | 1977-08-19 |
| DE2605663C2 (en) | 1985-06-27 |
| NL7701286A (en) | 1977-08-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |