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Balancing by Channel Height

As discussed in the previous section, balancing by land length does not always lead to satisfactory results. The other method is to balance by channel height. An example [Pg.659]

In Fig. 9.6 there is a thin wall connected to larger diameter circular sections. Without balancing, the flow through the circular section will be substantially greater than the slit section. The average velocity in the circular section will be  [Pg.659]

As a result, the ratio of the average velocity in the circular section and the slit section will be  [Pg.659]

The average flow velocity in the thin section is given by Eq. 9.2. With the wall w = 3 mm and the diameter of the circular section D = 9 mm the velocity ratio will be 3.375 when the power law index is 1. When the power law index is 0.4, the velocity ratio will be 6.764. This will clearly cause problems therefore, balancing will be required. The balancing can be done by land length. This will require the following ratio of land length  [Pg.660]

If the circular sections of the profile need to be solid the cylindrical pins can be terminated before the exit of the die so that the polymer melt can fill the entire cylindrical section. [Pg.661]


Another example of balancing by channel height is the profile shown in Fig. 9.10. [Pg.661]


See other pages where Balancing by Channel Height is mentioned: [Pg.659]   


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