Browse Prior Art Database

DEVICE FOR REPRODUCIBLE MEASUREMENTS OF ROLL HARDNESS

IP.com Disclosure Number: IPCOM000024460D
Original Publication Date: 1980-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 91K

Publishing Venue

Xerox Disclosure Journal

Abstract

It is known to measure the hardness of rubber compositions by using a Shore A durometer gauge. Typically, a Shore A durometer is slidably mounted on a vertical stand with a horizontal platform attached to the lower end of the vertical stand. The Shore A durometer is generally a meter having a needle point extending downwardly from the bottom of the durometer. In measuring the hardness of a rubber sample, the sample is generally provided in the form of a pad or sheet placed on the horizontal platform. The Shore A durometer is then dropped from a predetermined height from the sample on the vertical stand. The depth of indentation of the needle point into the sample is a measure of the hardness of the sample. The difficulty in using such a device to measure the hardness of a roll covered by a rubber composition is that it is extremely difficult to obtain reproducible measurements. It is difficult to have the needle point of the Shore A durometer land on the same point on the circumference of rolls when the rolls are placed on the horizontal platform.

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XEROX DISCLOSURE JOURNAL

DEVICE FOR REPRODUCIBLE MEASURE- MENTS OF ROLL HARDNESS
Charles A. Rutty

Proposed Classification
U.S. Cl. 73/78 Int. C1. GOln 3/00

FIG. I FIG. 2

It is known to measure the hardness of rubber compositions by using a Shore A durometer gauge. Typically, a Shore A durometer is slidably mounted on a vertical stand with a horizontal platform attached to the lower end of the vertical stand. The Shore A durometer is generally a meter having a needle point extending downwardly from the bottom of the durometer. In measuring the hardness of a rubber sample, the sample is generally provided in the form of a pad or sheet placed on the horizontal platform. The Shore A durometer is then dropped from a predetermined height from the sample on the vertical stand. The depth of indentation of the needle point into the sample is a measure of the hardness of the sample. The difficulty in using such a device to measure the hardness of a roll covered by a rubber composition is that it is extremely difficult to obtain reproducible measurements. It is difficult to have the needle point of the Shore A durometer land on the same point on the circumference of rolls when the rolls are placed on the horizontal platform.

In accordance with the present invention, a conveloader is provided which will permit the reproducible measurement of the hardness of rubber rolls. Referring to Figure 1 in the drawing, a Shore A durometer, generally illustrated at 10, is slidably mounted on a vertical stand 11. A sample bed 12 is mounted on supports 13. V" blocks 14 are slidably mounted on sample bed 12 so that the lV1...