Diagnostics of extrusion processes by Natti S. Rao

By Natti S. Rao

The frequent use of enormous scale devices for production blown movie, blow-molded articles, flat movie, and extruded pipes necessitates troubleshooting on web site. This booklet presents functional computational instruments which are utilized simply at the store flooring to procure speedy recommendations in those and plenty of different components of polymer extrusion.

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17 show that Screw 5 has the optimal geometry, because complete melting has been attained. This predicted result was confirmed in practice. 17 Determining optimal screw geometry Example 3: Improving the Quality of Melt in an ­Extruder Used for Extrusion Coating and Laminating This example deals with a screw used by a customer in a coating line for processing PET resin. It was found that the quality of the melt created by the screw was poor. As shown in Fig. 18, the simulation confirmed this observation of the customer.

1 (Continued): Pressure Drop vs. 1 (Continued): Pressure Drop vs. 1 Problem Solving by Simulating Shear Rate and Pressure Spiral mandrel dies are used in blown film processes for making films with as small a deviation in the film thickness as possible. As shown in Fig. 3, the polymer melt is divided into several separate feed ports which empty into spirally shaped channels of decreasing cross section cut into the mandrel. Between the die body and the land separating adjacent spirals, there is a gap, or an annulus, into which a part of the spiral flow leaks.

2. 1 Spider cross sections 50 Investigating Die Performance and Die Design follows from Eq. 10, as illustrated in the Examples 2 and 4 in Chapter 1. In general, the die consists of the geometrical sections given in Fig. 1. By using the program VISPIDER, the performance of a spider die can be easily simulated for any polymer without having to conduct any experiments with the die. 1, the pressure drop along the die length for different die gaps is calculated using the equations for the round channel and annulus given in [2] by using the program VISPIDER as shown in the Fig.

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