Oven-rise recorders

Seibel, W. 1968. Experiences with the maturograph oven-rise recorder. Bakers Digest 42(1 ) 44. Serna-Saldivar, S.O. 2003. Manufactura y Control de Calidad de Productos Basados en Cereales. AGT editor, S.A. Mexico, D.F. Mexico. 

The isothermal version of this test can also be used to detect induction time effects. In this test the sample is held for long periods under conditions of minimal heat loss. This can be achieved by placing the tube in a Dewar flask, which is then placed in an oven held at a steady temperature. Sample temperature and pressure inside the tube are recorded continuously. A rise in either temperature or pressure indicates onset of decomposition. Usually it is found that ... 

An analytical TREF system was first described by Wild and Ryle [8], Their system (Fig. 8) used components taken from a Waters model 200 size exclusion chromatograph. The solvent reservoir, degasser and pump from the Waters unit was used as was the refractive index detector system. In place of the SEC oven a temperature programmed oil bath provided the temperature gradients. A 0.2 g polymer sample was loaded in a hot trichlorobenzene solution into a small column packed with 40-60 mesh Chromosorb P. Crystallization was achieved by slow-cooling the polymer solution (0.2 g in 5 ml) in the packed column at a rate of 1.5 K/hour down to room temperature. The temperature rising elution was carried out at a flow rate of 6 ml/min and a rate of temperature rise of 8 K/hour. The refractive index response and the separation temperature were recorded continuously on a two-pen recorder. A calibration curve of methyl content vs. elution... 

As with other pressure-sensitive adhesive tests, the temperature is an important variable and tests are typically carried out at room temperature. A variation on this method is the SAFT test (shear-adhesion-failure temperature) in which the test apparatus is placed in an oven where the temperature is set to rise at 4.5°C/min. The temperature at which the tape fails is recorded as the SAFT value. 

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