Sheet Dimensions

Plywood is also favored for its resistance to splitting and punctures in normal constmction appHcations. Thicknesses range from j (0.63 cm) to s in. (1.9 cm) with the common sheet dimension of 4 X 8 ft (1.2 X 2.4 m). The number of pHes commonly range from three to five, but hardwood plywoods may have more. The outermost pHes are called faces or face pHes. Inner pHes with the grain parallel to the face are called core(s) or center, whereas those with the grain direction perpendicular to the face are called the crossbands. 

Mark the start with a pencil on a PEI Cellulose sheet (dimensions as in Protocol 3.1.2) and apply the samples with a microliter syringe or a pipet. 

Mechanical properties - Samples were cured in a Wickert laboratory press (WLP 1600/5 4/3) at a pressure of 100 bar (10 MPa) for the duration of lcured sheet dimensions were 90 x 90 mm2 and 2 mm thick. The stress-strain properties of the cured samples were measured on a Zwick Z020 tensile tester according to ISO-37 type 2. 

Thus, the changes in drop size which accompany changes in viscosity (Figure 1) appear to be related to changes in the shape and size of the spray sheet. The relationship between the various properties that govern sheet dimensions may be found from a dimensional analysis in a manner similar to that published for fan-jet nozzles (12). 

Practical Application of the Theory. The practical difficulty in using Equations 3 and 4 is in measuring the sheet dimensions I and a for hollow-cone nozzles r and 6 for fan-jet nozzles. Unlike the remaining parameters in Equations 3 and 4, these dimensions and angles cannot be measured in the field. However, they can be measured from flash photographs in the laboratory using a nozzle design similar to that to be used in the field. From the laboratory results, a plot of the appropriate Vi function vs. 1/Re can be drawn, where Re is calculated from ... 

Parallel, linear electrodes of defined length and spacing may he used on a sheet of test material larger than the electrode assembly. The method is not recommended, since a simple expression relating resistivity and resistance is not possible, the proportionality factor being dependent on the distances between electrodes and sheet boundaries. If the procedure is used, the factor for specified electrode and sheet dimensions should be determined empirically from measurements on material whose resistivity is known from measurements using the two methods above. 

In an experiment designed to reveal surface features, a sample of rolled aluminum 2024 sheet (dimensions 100 X 40 X 4 mm) was placed in a 250-mL beaker in such a way that it was immersed in aerated 3% NaCl solution to a level about 30 mm from the top of the specimen. The effect of aeration created a splash zone over the portion of the surface that was not immersed. During the course of exposure, a portion of the immersed region in the center of the upward-facing surface became covered with gas bubbles and suffered a higher level of attack than the rest of the immersed surface. After 24 h, the plate was removed from the solution. Figure 4.2 shows the specimen and the areas where the surface profiles were measured in diagrammatic form. 

Maximum sheet dimension for cutting is 3 m 1 m for fine blanking. 

Brown [1951] and Brindley and MacEwan [1953] adopted the approach of considering the b axes for pairs of minerals [e.g., Al(OH)3 and Mg(OH)2], which have a similar layer structure to the octahedral layers of micas. This led to an expansion coeflScient associated with a given substitution—in this case of 3Mg for 2AP. While their formulas gave general agreement with experimental results, they did not satisfactorily predict cell dimensions of some micas of extreme composition. For each pair of minerals, it so happened that there was some unique structural factor modifying at least one sheet dimension, so that the differences could not be used for a general prediction formula (Radoslovich [1962]). 

---