Equipment and procedures for the rapid measurement of the water vapor
permeability of polymer films and food coatings has been evaluated. The
method uses an electronic sensor to measure the concentration increase in
water vapor diffusing through a film into a chamber of known volume. Air of
known humidity is passed over each side of the film to establish a desired
equilibrium relative humidity differential prior to each test. Experimental results
showed that moisture vapor transmission rates of polymer packaging films and
edible coatings could be determined in a range from 0.25 to 12 hours instead
of the usual 24 hour period required by existing tests. Permeance values for
Teflon, high density polyethylene (HDPE), polyethylene terephtalate (PET) and three coating materials were measured at relative humidity differentials between
0 - 100% and temperatures between 5 and 30°C. Results were found to be
similar to values reported in the literature using standard measurement methods.
This method allows the measurement of film and coating permeance values at
temperature and relative humidity values close to actual food storage conditions. / Graduation date: 1994
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/27233 |
| Date | 18 February 1994 |
| Creators | Tello-Lopez, Edgar Eduardo |
| Contributors | Torres, J. Antonio |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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