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Toner Cake Resistance Test

IP.com Disclosure Number: IPCOM000051315D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Eklund, CD: AUTHOR [+2]

Abstract

The propensity of xerographic toner to cake is measured by baking a confined mass of toner which is supported on a screen, and then measuring the amount of pneumatic pressure necessary to force the baked toner to pass through the screen.

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Toner Cake Resistance Test

The propensity of xerographic toner to cake is measured by baking a confined mass of toner which is supported on a screen, and then measuring the amount of pneumatic pressure necessary to force the baked toner to pass through the screen.

A toner manufacturer is always concerned with the tendency of a manufactured batch of toner to compact or cake when subjected to conditions such as found in a copier, or conditions found during storage and shipment.

A copper tube 10, 11 is provided with a 600 Mu opening brass screen 12 which is soldered across the tube's inner diameter, approximately 3/4 inch from its bottom end. This bottom end is then covered by a TEFLON* cap. Tube portions 10 and 11 are both of 1/2 inch outer diameter. Portion 10 is 2 inches long, whereas portion 11 is 3/4 inch long.

Toner to be tested is aerated by shaking the toner in a closed container (not shown) for about 10 seconds. The toner is then fed into the upper end of tube portion 10 at the rate of about 1.25 grams per minute. The filled tube is now placed in an oven at 50.5+/-.3 degrees C for 18 hours to simulate operating conditions which might tend to induce caking. The tube is then removed from the oven and allowed to cool to ambient temperature.

Tube 10, 11 is now attached to the steel air tank 13, as shown in Fig 2. Tank 13 is connected to a source of air pressure 14. The use of reservoir tank 13 allows a slow, uniform increase in air pressure to occur, as indicat...