Procedure and apparatus for determining the vulcanization coefficient of elastomers

US5417117A · kind A · utility

Assignee

• Parker-Pradifa GmbH · DE

Inventors

• Peter Krumeich · Stuttgart, DE
• Gerhard Streit · Heilbronn, DE
• Hans-Bernd Fuchs · Marl, DE
• Christian Strauss · Dachau, DE

Key dates

• Filing date: Mar 23, 1992
• Grant date: May 23, 1995
• Expiry date: Mar 23, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/445
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The object of the invention is a procedure for vulcanization which includes a determination of the vulcanization coefficient of an elastomeric workpiece, and an apparatus for the application of the procedure. Prior art is the measurement of the rapture strength or the penetration depth of a needle and the calculation of the vulcanization coefficient from the measured value. The disadvantage is its restriction to the application for time-consuming measurements of samples taken at not too short intervals. Series testing is excluded. The task consists in defining a procedure which leaves the workpiece undestroyed and where the measuring time is so short that it can be applied in series; and in the development of the appropriate apparatus. The solution is a procedure where the workpiece to be tested is compressed and suddenly relieved, whereupon the recovery distance is followed and an asymptotic value determined from it, from which, after obtaining the result of the determination of the known vulcanization coefficient of at least two comparison specimens, the vulcanization coefficient of the workpiece can be determined graphically or by way of calculation; as well as an apparatus with…