Package thickness

Permeability of the package material. If the package thickness is 53 p.m, calculate the maximum package area that will maintain the RH of the product at or below 70% during 100 days of shelf life. 

The maximum recommended temperature for the package depends on the package thickness and volume. Table 43.2 lists the recommended reflow temperatures for Sn/Pb processing, whereas Table 43.3 lists the recommendations for Pb-free processing. 

The effect of package thickness on the flow velocity profile can be seen in Figs 6.9 and 6.10. 

In Fig. 6.9, the tube diameters were kept constant the package thickness was both increased and decreased 20% from the standard package thickness. The sohd lines represent the velocity profile when the package thickness is 0.0304 m, while the dashed lines represent the velocity profiles when the package thickness is 0.0456 m. The results show that there is no clear difference in the flow velocity... 

Flow velocity profiles for different package thicknesses where the inflow rate and tube size are kept constant. 

Figure 6.11 is the simulation result of the velocity field profile for different tube diameters, while the package thickness is kept constant. 

In Fig. 6.11, the package thickness and inflow velocity were kept constant, and different tube diameters were used. The solid line is the same as that in Fig. 6.1, while the dashed line represents the velocity profiles under the same parameters as those used in Fig. 6.1, but with a 20% larger tube diameter. The result shows that a higher velocity field in both the mbe and porous package is obtained when the tube diameter is increased. The increase of the velocity field, however, is not directly caused by the increase of the mbe size, but by a higher flow rate, to keep... 

CDEP against time for different package thicknesses and a Nernst type adsorption isotherm. 

Thus, according to the simulation results, both package thickness and porosity are important variables, which strongly affect the dyeing process. The effect of package thickness and porosity on dyeing for the other two types of adsorption isotherm is similar. 

Slight variations in package thickness (for example, 20%) do not significantly affect flow characteristics in free liquor (tube) and porous yam package, but will change the pressure gradient within the system. 

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