Moisture Analysis - Pittsburg State University Plastics...

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Pittsburg State University Plastics Testing (Moisture Analysis Test) Lab Instructor: Jo Oplotnik By: Josh Waugh Plastics Engineering Tech For: Professor Emadipour 11/15/07 1
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Summary The main objective of the Moisture Analysis Lab was to become acquainted with the testing procedure and the machine itself. The moisture analyzer was used to detect moisture in various resin samples. The two materials tested during the lab were Poly Carbonate, Nylon, and ABS. Introduction The moisture analyzer is used to detect the volatile content of a sample of test material. Moisture is driven from the sample by heating it in a small oven chamber using a pre-set temperature. As the sample loses mass, a digital force balance measures its weight and signals a microprocessor which controls the testing process and calculates moisture content. Most plastic resins are hygroscopic materials. They absorb moisture from humid air and give moisture back to dry air. Every type of resin can hold a specific amount of moisture between its molecular chains. Additional amounts of moisture can be condensed on the surface of the pellets (surface moisture). Non-hygroscopic resins, do not adsorb any moisture, but they still can have surface moisture. Using a moisture analyzer can help detect moisture in resins because moisture is known to cause defects in molded plastics and could also lead to a complete halt in production. Procedure Turn the instrument ON by pressing the switch on the back of the analyzer above the power receptacle and the opening screen will appear. 1. Adjust the contrast controls on the analyzer’s front panel as necessary to view the screen display. 2
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2. Before beginning any test, allow the instrument to warm up for 30 minutes. 3. The front panels controls consist of two arrow keys at the left used to adjust the display contrast, five small keys below the display labeled ◄, ►, ▲, ▼, are used to navigate through the menu system, and to respond to prompts on the screen. 4.
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This note was uploaded on 04/09/2008 for the course PET 375 taught by Professor Ibeh during the Spring '08 term at Pittsburg State Uiversity.

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Moisture Analysis - Pittsburg State University Plastics...

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