| Titre : |
Water vapor permeability of leather and leatherlike sheet materials : a new approach |
| Type de document : |
texte imprimé |
| Auteurs : |
Ludwig Seligsberger, Auteur |
| Année de publication : |
1975 |
| Article en page(s) : |
p. 98-113 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cuir
Cuir synthétique
Cuirs et peaux -- Analyse
Essais (technologie)
Perméabilité
Vapeur d'eau
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Water vapor permeability can be determined by establishing a gradi-ent from zero to near 50 percent relative humidity using a desiccant like calcium chloride, or a gradient from almost 50 percent to 100 per¬cent relative humidity using water. New variants of water vapor trans¬mission methods were investigated. Common to these is the use of a turntable to control the airflow near the assembly with the specimen. The desiccant method was improved by making the hygroscopie surface next to the specimen renewable. In the method using water, a hydrophobic microporous barrier was placed between water and specimen, and the passage of water vapor through this barrier simulating the skin was accelerated by raising the water temperature through an external electric heating system. Experiments were conducted on several types of leather and on sheet materials used as leather substitutes. Water vapor transmission was measured in dynamic tests using the turntable and in static tests in which the assembly with the specimen was stationary. In additional static and dynamic tests the rate of evaporation of water in the presence or absence of the barrier material and the water pickup of the desiccant itself were determined. The results are summed up in five tables. It is concluded that the rates of water vapor transmission found at 21°C. by the new variant of the desiccant method and by the method using water next to a microporous barrier are not substantially different. Raising the water temperature to 39°C., on the other hand, raised transmission rates for three types of leather 3.3 to 8.6 times and for expanded or perforated vinyl 35 to 65 times. These unexpected differences point out the importance of simulating actual wear conditions in the assessment of water vapor permeability as a comfort factor. |
| Note de contenu : |
- APPARATUS : For the desiccant method - For the method using water at 21°C - For the method using water at 390°c - Properties of FHLP filters - Equipment for additional tests
- METHODS OF TEST AND REPORTING RESULTS : Deiccant method - Dynamic method using water at 21°C - Dynamic method using water at 39°C - "Blank" determinations
- RESULTS : Desiccant method - Method using water at 21°C and 39°C
- DISCUSSION : Desiccant method - Method using water
- Table 1 : Water vapor permeability with calcium chloride as desiccant in absence or presence of leather and other sheet materials
- Table 2 : Evaporation and transmission of water vapor in absence and presence of a hydrophobic microporous barrier
- Table 3 : Water vapor permeability of leather and other sheet materials in presence of a hydrophobic microporous barrier
- Table 4 : Comparative values for water vapor permeability on turntable and in test chamber
- Table 5 : Ratios obtained by measuring evaporation, absorption, and water vapor transmission by different methods |
| En ligne : |
https://drive.google.com/file/d/1DzSHvfxCdVUe6aUUqjmCmgz80erh4M8E/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38781 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 98-113
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Water vapor permeability of leather and leatherlike sheet materials : a new approach in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
