Relaxation shrinkage

Relaxation methods, 24 614 high pressure, 23 424 129 Relaxation shrinkage tests, 26 390-391 Relaxed filtration oil muds, 9 5 Relaxor ferroelectrics, 22 105-106 properties of, 22 105t Release agents, 22 598-609... 

To determine relaxation shrinkage the samples are soaked for at least... 

As an alternative the test may be carried out in the laboratory scalemilling machine described in B.S. 1955 1953 (Fig. 11.11). The excess liquor is removed from the specimen, after determination of relaxation shrinkage, by passing the fabric through the rubber-covered rollers of a hand wringer, or in a hydroextractor, until the liquor retained is 55 to 60 per cent of the dry weight of the sample. The load is then wetted with 40 g of freshly prepared 5 per cent solution of sodium oleate. The sample is subsequently milled under the specified conditions and afterwards rinsed and measured under water in a tray. 

A significant improvement in shrink resistance was observed after the subsequent plasma treatment (Table 3.7). Clearly, the shrinkage increases as the processing is changed from relaxation shrinkage to felting shrinkage. 

S4 is the fabric shrinkage offset (%), in the equilibrium state after drying in room conditions. S4 is estimated by the measurement after 24 h drying in room conditions (= relaxation shrinkage). 

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