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TAPPI UM 573
Water vapor permeability of sheet materials at -18°C (0°F)
Organization:
TAPPI - TAPPI
Year: 2010
Abstract: Scope and significance
This method is for the determination of water vapor permeability of paper, paperboard, and flexible packaging materials under storage conditions at -18°C (0°F). It is generally suitable for sheet materials up to 125 μm (5 mils) thick. The method has been developed because of increased emphasis on frozen-food production, and because no existing procedure gives results which correlate with those at -18°C. [TAPPI T 448 "Water Vapor Transmission Rate of Sheet Materials at Standard Temperature and Humidity" is suitable at temperatures of 23°C (73°F) and 50% relative humidity, and TAPPI T 464 " Gravimetric Determination of Water Vapor Transmission Rate of Sheet Materials at High Temperature and Humidity" applies at 38°C (100°F) and 90% RH.]
In general, packaging materials used for storage at -18°C should be capable of protection against an appreciable loss of moisture for periods up to 1 or 2 years. The final selection of materials for such storage is probably best done by actual package storage tests for the full length of time required. This method is a simplified and rapid method which has been shown to give results indicative of behavior during long-term storage. Many of the packaging materials are based on cellulose, including paper, paperboard, cellophane, and glassine. The time required for these materials to reach moisture equilibrium when exposed at -18°C may be several weeks or months. The assumption is made in this procedure that equilibrium is reached, for practical purposes, in the 7-day initial conditioning period.
This method is for the determination of water vapor permeability of paper, paperboard, and flexible packaging materials under storage conditions at -18°C (0°F). It is generally suitable for sheet materials up to 125 μm (5 mils) thick. The method has been developed because of increased emphasis on frozen-food production, and because no existing procedure gives results which correlate with those at -18°C. [TAPPI T 448 "Water Vapor Transmission Rate of Sheet Materials at Standard Temperature and Humidity" is suitable at temperatures of 23°C (73°F) and 50% relative humidity, and TAPPI T 464 " Gravimetric Determination of Water Vapor Transmission Rate of Sheet Materials at High Temperature and Humidity" applies at 38°C (100°F) and 90% RH.]
In general, packaging materials used for storage at -18°C should be capable of protection against an appreciable loss of moisture for periods up to 1 or 2 years. The final selection of materials for such storage is probably best done by actual package storage tests for the full length of time required. This method is a simplified and rapid method which has been shown to give results indicative of behavior during long-term storage. Many of the packaging materials are based on cellulose, including paper, paperboard, cellophane, and glassine. The time required for these materials to reach moisture equilibrium when exposed at -18°C may be several weeks or months. The assumption is made in this procedure that equilibrium is reached, for practical purposes, in the 7-day initial conditioning period.
Subject: Flexible packaging
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| contributor author | TAPPI - TAPPI | |
| date accessioned | 2017-09-04T15:31:45Z | |
| date available | 2017-09-04T15:31:45Z | |
| date copyright | 2010.01.01 | |
| date issued | 2010 | |
| identifier other | OEOUYDAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std;jsery=auth=177/handle/yse/33285 | |
| description abstract | Scope and significance This method is for the determination of water vapor permeability of paper, paperboard, and flexible packaging materials under storage conditions at -18°C (0°F). It is generally suitable for sheet materials up to 125 μm (5 mils) thick. The method has been developed because of increased emphasis on frozen-food production, and because no existing procedure gives results which correlate with those at -18°C. [TAPPI T 448 "Water Vapor Transmission Rate of Sheet Materials at Standard Temperature and Humidity" is suitable at temperatures of 23°C (73°F) and 50% relative humidity, and TAPPI T 464 " Gravimetric Determination of Water Vapor Transmission Rate of Sheet Materials at High Temperature and Humidity" applies at 38°C (100°F) and 90% RH.] In general, packaging materials used for storage at -18°C should be capable of protection against an appreciable loss of moisture for periods up to 1 or 2 years. The final selection of materials for such storage is probably best done by actual package storage tests for the full length of time required. This method is a simplified and rapid method which has been shown to give results indicative of behavior during long-term storage. Many of the packaging materials are based on cellulose, including paper, paperboard, cellophane, and glassine. The time required for these materials to reach moisture equilibrium when exposed at -18°C may be several weeks or months. The assumption is made in this procedure that equilibrium is reached, for practical purposes, in the 7-day initial conditioning period. | |
| language | English | |
| title | TAPPI UM 573 | num |
| title | Water vapor permeability of sheet materials at -18°C (0°F) | en |
| type | standard | |
| page | 5 | |
| status | Active | |
| tree | TAPPI - TAPPI:;2010 | |
| contenttype | fulltext | |
| subject keywords | Flexible packaging | |
| subject keywords | Paper | |
| subject keywords | Paperboard | |
| subject keywords | Sheets | |
| subject keywords | Water vapor permeability |