US1765032A

US1765032A - Method of seasoning condensers

Info

Publication number: US1765032A
Application number: US181615A
Authority: US
Inventors: Leon H Richmond
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-04-06
Filing date: 1927-04-06
Publication date: 1930-06-17
Anticipated expiration: 1947-06-17

Description

No Drawing.

Patented June 17, 1930 PATENT OFFICE LEON H. RICHMOEND, OF FORT H. G.-WRIGHT,NEW YORK METHOD OF SEASON ING CONDENSEBS This invention relates to electric Condensers I particularly those of the type used in radio communication, and has specific relation to the material employed as the dielectric.

The primary object of my invention is to provide a method of treating a condenser in such a manner as to effect a permanent increase in its capacity and to minimize the coefiicientofchange in capacity with a change in temperature.

It has been discovered that condensers eniploying fibrous dielectrics, such as paper, after ageing for some time, have a capacity greater than when first manufactured. This is particularly true in the rolled type of paper condenser. Moreover, the change of capacity is found to be greater when two or more layers of paper are used for insulation than when only one layer is employed. This change of capacity takes place even when the condenser is not exposed to air.

It is therefore proposed to incorporate in the process of manufacture of the condenser a method which will prevent this change of capacity with age. Generally, this method is applicable to rolled condensers of circular cross section, that is, they have not been subected to any forming process after being rolled in the usual manner, and consists in causing the condenser topass through cycles of temperature changes. I

Specifically the process consists in exposing the condenser to temperatures as follows:

1. Temperatures ranging from 25 to 45 Fahrenheit for three days.

2. Ordinary temperatures for not less than two days.

3. Temperatures rangin from O to 5 Fahrenheit. b

4. Ordinary temperatures for not less than two days.

6. Ordinary temperatures for not less than two days.

7. Temperatures ranging from 25 to Fahrenheit for three days.

8. Ordinary temperatures for not less than two days.

9. Temperatures ranging from 112 to' Application filed. April 6, 1927. Serial No. 181,615.

115 for forty-eight hours.

10. Room temperatures for'not less than a week before calibrating.

The variations in temperatures over comparatively long periods make minute changes in the shape of the condenser and the relative position of the conducting layers, thus giving it a permanent set. The final raising to a high temperature, namely, 112 to 115 Fah renheit, softens the dielectric, and by expansion due to heat, causes internal pressure and squeezes all the irregularities out of the di electric, thus making it a smooth homogeneous sheet.

' The condenser may or 'may not be placed in a covering or container during this season ing process. No pressure other than atmospheric pressure and no special equipment is necessary exceptthe means for varying the temperature and maintaining it within certain limits. Temperatures as high as the melting point of the dielectric (paraflin, wax, or the like) are not employed in this process.

The results actually obtained by the practical application of this seasoning process are a permanent increase and a minimum coefficient of change in capacity of the condenser with a change in temperature; a more constant and unchanging power factor; and no permanent change in capacity or power factor due to a change in temperature within limits of seasonal. changes, ranging approximately from 5 Fahrenheit to 110 Fahrenheit.

Having thus described my invention what I claim is 1. The method of seasoning or treating a condenser after being. rolled in the usual manner, which method consists in exposing said condenser to a cycle of temperature changes said cycle of temperature changes being sufiicient to permanently set the electrical capacity of the condenser but insufficient to melt the elements thereof.

2. The method of seasoning or treating a condenser after being rolled in the usual manner, which method consists in exposing said condenser to a cycle of temperature changes, said cycle consisting of alternate periods of ordinary temperatures and periods of variant temperatures substantially diiferit-b5...

ing from said ordinary temperatures but insuflicient to melt the condenser elementssaid periods of temperature variations bein arranged to cause a permanent fixing o the I 1 electrical capacity of the condenser.

3. The method of seasoning or treating a condenser after being rolled in the usual manner, which method consists in exposing said condenser to a cycle of'temperature changes, said cycle consisting of alternate periods of ordinary temperatures and periods of temperatures substantially difiering from said ordinary temperatures, the last period of said diflering temperatures being a temperature considerably in excess in degree to the other temperatures but less than the melting temperature of the condenser elements.

4. The method of effecting an increased and constant capacity in a condenser, which method consists in exposing said condenser to a series of temperature changes which a1- ternately vary from ordinary temperatures to temperatures difi'ering sufliciently from said ordinary temperatures to set the elements of the condenser but insuflicient to cause fusion of the elements.

5. The method of seasoning or treating a condenser after having been rolled in the usual manner, which method consists in subjecting' said condenser to a cycle of temperature changes, including in sequence temperatures ranging from 25 to 45 Fahrenheit; ordinary temperatures; temperatures ranging from 0 to 5 Fahrenheit; ordinary temperatures; temperatures ranging from to- Fahrenheit; ordinary temperatures; temperatures ranging from 25 to 45 Fahrenheit; ordinary temperatures; temperatures ranging from 112 to Fahrenheit; room temperatures.

6. The method of seasoning dr treating a I condenser after having been rolled in the usual manner, which vmethod consists in sub-. ect1ng said condenser to a cycle of temperature changes, including in sequence temperatures ranging from 25 to 45 Fahrenheit for Y three days; ordinary temperatures for not less than two days; temperatures ranging from 0 to 5 Fahrenheit for forty-eight hours; ordinary temperatures for not less than'two days; temperatures ranging from .90 to 100 Fahrenheit for forty-eight hours;

. ordinary temperatures for not less than two days; temperaturesranging'fro m 25 to 45 Fahrenheit for three days; ordinary temperatures for not less than twodays; temper'a tures ranging from 112 tog115 Fahrenheit for forty-eight hours and room temperatures for not less than a week before calibrating.

In testimony whereof I afiix my si ature.

LEON H. RICHMOND.