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Identify the following polymer processing techniques as either: (i) Continuous (able to operate for very long periods of time as long as enough polymer is supplied), (ii) Batch or semi-continuous (able to make one material at a time, or possibly operate in a cyclic

Identify the following polymer processing techniques as either: (i) Continuous (able to operate for very long periods of time as long as enough polymer is supplied), (ii) Batch or semi-continuous (able to make one material at a time, or possibly operate in a cyclic

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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### Polymer Processing Techniques **17.5. Identify the following polymer processing techniques as either:** (i) **Continuous**: Able to operate for very long periods of time as long as enough polymer is supplied. (ii) **Batch or Semi-continuous**: Able to make one material at a time, or possibly operate in a cyclic fashion for a long time with small breaks between processing. - **Thermal Extrusion** - **Casting to Form a Thermoset Polymer** - **Blow Molding** - **Melt Spinning of Fibers** - **Thermoforming** - **Injection Molding** - **Blow Extrusion** - **Calendering** - **Compounding** - **Rotational Molding** ### Problem-Solving in PET Bottle Production **17.6. Scenario:** You work at a plant that makes poly(ethylene terephthalate), PET, bottles using blow molding. The production line is having issues with a high number of rejected bottles, which must be ground up and recycled. Problems with the bottles include holes in the threaded part at the top (where the screw-cap goes), or this part is often too thin and lacks rigidity for the screw cap to fit snugly. **A. Problem Explanation:** The likely causes for the defective bottles could include: - **Inconsistent Material Distribution:** Uneven parison thickness or unequal heating during the blow molding process leading to weak points. - **Improper Cooling Time:** Inadequate cooling of the molded bottle, impacting structural integrity. - **Incorrect Mold Design:** Issues with the mold design not allowing for proper material flow and forming. **B. Suggested Process Changes:** 1. **Improve Parison Uniformity:** - Ensure the parison is of consistent thickness before blowing. This can be achieved by adjusting the extruder settings or using a more precise parison cutting technique. 2. **Optimize Cooling Process:** - Modify cooling time and techniques to ensure even cooling. This could involve changing the cooling time or using molds with better heat dissipation properties.
Transcribed Image Text:### Polymer Processing Techniques **17.5. Identify the following polymer processing techniques as either:** (i) **Continuous**: Able to operate for very long periods of time as long as enough polymer is supplied. (ii) **Batch or Semi-continuous**: Able to make one material at a time, or possibly operate in a cyclic fashion for a long time with small breaks between processing. - **Thermal Extrusion** - **Casting to Form a Thermoset Polymer** - **Blow Molding** - **Melt Spinning of Fibers** - **Thermoforming** - **Injection Molding** - **Blow Extrusion** - **Calendering** - **Compounding** - **Rotational Molding** ### Problem-Solving in PET Bottle Production **17.6. Scenario:** You work at a plant that makes poly(ethylene terephthalate), PET, bottles using blow molding. The production line is having issues with a high number of rejected bottles, which must be ground up and recycled. Problems with the bottles include holes in the threaded part at the top (where the screw-cap goes), or this part is often too thin and lacks rigidity for the screw cap to fit snugly. **A. Problem Explanation:** The likely causes for the defective bottles could include: - **Inconsistent Material Distribution:** Uneven parison thickness or unequal heating during the blow molding process leading to weak points. - **Improper Cooling Time:** Inadequate cooling of the molded bottle, impacting structural integrity. - **Incorrect Mold Design:** Issues with the mold design not allowing for proper material flow and forming. **B. Suggested Process Changes:** 1. **Improve Parison Uniformity:** - Ensure the parison is of consistent thickness before blowing. This can be achieved by adjusting the extruder settings or using a more precise parison cutting technique. 2. **Optimize Cooling Process:** - Modify cooling time and techniques to ensure even cooling. This could involve changing the cooling time or using molds with better heat dissipation properties.
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