Drop dissipation test

A variety of techniques including rising height and contact angle measurements, the drop dissipation test and tensiometry have been used to quantify increases in hydrophilicity [48, 49, 53, 57, 67]. For example, treatment of PET fabrics with a T.fusca cutinase and T. lanuginosus lipase lead to a wetting time of 120 s and 100 s, respectively, compared with 45 2 min for the untreated material [24]. 

An example of the success of the temporary network model for a practical application is shown in Fig. 3-11. Here, the predictions of Eq. (3-24) are compared to experimental force-deflection data for impact tests in which a heavy flat-bottomed object is dropped onto a flat circular pad of dissipative Sorbothane rubber at various velocities and two different temperatures. Since the material is nearly incompressible under these conditions, the impact... 

The caterpillar micromixer consists of a number of serial oriented unit cells that repeat and complete the same type of mixing process. Eight such cells are serially combined in the standard version that is commercially available. Dependent on the mixing problem, however, more or less units may be appropriate, which, especially for production, needs to be optimized to reduce the pressure drop to the limit really needed and for efficient power dissipation. For this reason, caterpillar devices (600 pm width and depth) with 0, 2, 4, 6, and 8 mixing cells have been manufactured to test mixing efficiency by a standardized protocol (Fig. 6.3) ]27]. 

Changes in the water transport rate of treated PET fabrics have been measured by a vertical wicking test in which the rising height of water in a strip of fabric is determined [3, 33, 77], Measurements of the dissipation of a drop of water on fabric [ 11, 38,62], liquid retention capacity (the ratio of the amount of liquid to the dry fabric quantity), and moisture regain (the amount of water a dry fiber absorbs from the air at a defined relative humidity) [43, 44, 51, 60] also aim to determine changes in the water absorption behavior of treated PET fabrics. Incomplete removal of enzymes adsorbed to the PET surface can, however, easily lead to incorrect results obtained using these methods [11, 23, 102]. 

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