| Titre : |
Comparative instrumental evaluation of water-resistant upper leathers |
| Type de document : |
texte imprimé |
| Auteurs : |
Ludwig Seligsberger, Auteur ; Richard F. Lacerte, Auteur |
| Année de publication : |
1975 |
| Article en page(s) : |
p. 66-75 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cuirs et peaux -- Analyse
Evaluation
Mesure -- Instruments
Résistance à l'humidité:Résistance à l'eau
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
The Dow Corning Tester w•as introduced as an alternative for measuring water resistance in leather hecause the number of flexes to produce a leak was found to he approximately one quarter of the number required on the Maeser Tester. An investigation was conducted to determine how three possible ways of mounting specimens in the Dow Corning 'l'ester would affect water penetration. The results show that w•ater penetration is achieved faster with the Dow Corning Tester than with the Maeser Tester only when the specimens are mounted with their walls parallel tu each other during maximum extension. The gaskets prescrihed for use with the Dow Corning Tester are not essential and need not be used. When a four-by-four inch specimen is mounted to form a pouch with a middle fold before the machine is turned on, the specimens are compressed, slowing down the rate of water penetration to the extent that no saving in time is realized, compared to the Maeser Tester. In fact, with some of the leathers tested in this manner flexing had tu he terminated after 100,000 cycles because no leakage occurred, as is frequently ohserved on the Maeser Tester. The precision of the methods in which end points were reached with unahraded samples was hetter than expected, with the coefficients of variation ranging from 29 to 67 percent, compared with 100 percent termed "not unusual" in the description of the standard method issued by the American Society of Testing and Materials.
Final tabulation shows that for the water-resistant upper leathers examined the mean ratio of the number of flexes till leakage in the Maeser Tester to the number of flexes till leakage in the Dow Corning l'ester was in the vicinity of 2.5, which is somewhat lower than previously reported. |
| Note de contenu : |
- Equipment
- Procedure
- Table 1 : Water resistance of flesh out upper leather
- Table 2 : Water resistance of abraded flesh out upper leather
- Table 3 : Water resistance of flesh out upper leather
- Table 4 : Water resistance of grain out upper leather
- Table 5 : Ratio of results on maeser and dow corning tester
|
| En ligne : |
https://drive.google.com/file/d/17kLLzNdF9Pdhyl6ES0QrYuI0lErjfoYT/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38780 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 66-75
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Comparative instrumental evaluation of water-resistant upper leathers in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
