Changes in the Infrared Absorbance and Color of Aged Cellulose Film

1992 ◽  
Vol 267 ◽  
Author(s):  
Frances Whitaker Mayhew ◽  
Ira Block
Keyword(s):  
Reaction Rate ◽  
Color Change ◽  
Visible Region ◽  
Accelerated Aging ◽  
Deionized Water ◽  
Uv Absorbance ◽  
Convection Oven ◽  
Air Convection ◽  
Cellophane Film ◽  
Forced Air

ABSTRACTThe accelerated aging of unplasticized Cellophane film specimens was conducted at tempe:atures ranging from 80 to 150 °C in a dry, forced-air convection oven for various periods of time. Colorimetric evaluation showed increasing discoloration which could be partially reversed by rinsing in deionized water. The infrared spectra of samples aged within this temperature range show the same changes, dependent upon aging time. This indicates that the species formed in the films at temperatures above and below the boiling point of water are the same, and that the moisture content of the films may affect the reaction rate, but not the mechanisms. The observed data in the visible region fit the standard pseudofirst-order kinetics model and are in excellent agreement with those determined for both the color change of cotton and the UV absorbance of Cellophane under similar conditions.

Evaluation of electric belt grill, forced-air convection oven, and electric broiler cookery methods for beef tenderness research

Meat Science ◽  
2001 ◽  
Vol 58 (3) ◽  
pp. 239-246 ◽  
Author(s):  
T.E Lawrence ◽  
D.A King ◽  
E Obuz ◽  
E.J Yancey ◽  
M.E Dikeman
Keyword(s):  
Beef Tenderness ◽  
Convection Oven ◽  
Air Convection ◽  
Forced Air

scholarly journals Modeling of cooking strip loin and outside round steaks in a forced-air convection oven

2003 ◽  
pp. 5-8
Author(s):  
E. Obuz ◽  
Larry E. Erickson ◽  
Melvin C. Hunt ◽  
T.J. Herald ◽  
Michael E. Dikeman
Keyword(s):  
Convection Oven ◽  
Air Convection ◽  
Forced Air ◽  
Strip Loin

Assessment of Color Stability of Treated Leathers with Silicone Oil and Polyethylene Glycol

2014 ◽  
Vol 1 (1) ◽  
pp. 24-34
Author(s):  
Alireza K. ◽  
Hossein Ahmadi ◽  
Mohsen Mohammadi
Keyword(s):  
Ascorbic Acid ◽  
Polyethylene Glycol ◽  
Treatment Process ◽  
Color Change ◽  
Silicone Oil ◽  
Accelerated Aging ◽  
Color Stability ◽  
Antioxidant Additive ◽  
Before And After ◽  
Aesthetic Values

Lubricants and leather dressings are the most common treatments of dry and water logged historical leathers. Color change has a great importance during the time and treatment process, due to visual and aesthetic values of historic leather relics. Polyethylene glycol (PEG) and silicone oil (SiO) are frequently used leather dressings in the conservation procedures. Therefore, color stability of treated leathers with PEG and SiO were investigated before and after heat accelerated aging. Moreover, application of ascorbic acid was evaluated as an antioxidant additive for PEG (PEG+AA).Color change after treatment and aging were studied by colorimetry technique in the CIE *L*a*b system. Results indicated to severe color alteration in PEG treated and aged leathers with or without ascorbic acid. Whereas, SiO treated samples showed better stability and minimum color shift after aging. Silicone oil was characterized as the best dressing for historical leathers with compared to PEG and PEG+AA, due to its high stability and aesthetical properties.

Natural and forced air convection operation in a direct solar dryer assisted by photovoltaic module for drying of green onion

Solar Energy ◽  
2021 ◽  
Vol 220 ◽  
pp. 24-34
Author(s):  
Letícia Ferraresi Hidalgo ◽  
Mariana Nascimento Candido ◽  
Karina Nishioka ◽  
José Teixeira Freire ◽  
Gustavo Nakamura Alves Vieira
Keyword(s):  
Photovoltaic Module ◽  
Air Convection ◽  
Solar Dryer ◽  
Forced Air
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