| Titre : |
The rapid fellmongering of New Zealand skins |
| Type de document : |
texte imprimé |
| Auteurs : |
Mary Dempsey, Auteur ; J. Haarer, Auteur ; I. R. Hughes, Auteur ; G. W. Vivian, Auteur |
| Année de publication : |
1978 |
| Article en page(s) : |
p. 108-113 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Cuirs et peaux
DéchaulageOpération consistant à débarrasser les peaux de la chaux et des substances alcalines qui leur ont été appliquées au pelanage.
Délainage
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
In experiments on rapid processing of pelts with paints made of sodium sulphide and caustic soda thickened with lime, good pull was achieved after 2 h with a paint at 2000 mgEq NaOH/1 containing not less than 6° Bé sodium sulphide (4 % Na2S). The temperature in pile was controlled by the temperature of the pelt at painting. Raising the temperature in pile (18° was compared to 22°c) favoured wool loosening but unduly loosened the "scud" (epidermal residue left over the pelt) especially if the paint contained a high amount of caustic soda. After a 2 h wool pull and liming at cool temperatures (16° was compared with 26°c falling to 23° overnight) the pelt was more mottled than the normal current production. Liming at 32°c and pH 12.5 reduced mottle to a level satisfactory for nappa leathei and gave fuller feeling leather, but one of three cooperating tanners found some dull grain in leather from 2 h pull and warm liming. Liming at 32°c may be dangerously warm for works conditions: temperature not higher than 28 ° is recommended. The relation between the blood vessels in the skin and plumping on the one hand and, on the other, increased temperature and opening up of the fibre structure explains the development of mottle and its avoidance by warm liming. |
| Note de contenu : |
- Preliminary tests
- Experiment I
- Experiment II
- Results : Works reports - Laboratory report
- Experiment III
- Table 1 : The effect of alkalinity
- Table 2 : Pulling (Experiment I)
- Table 3 : The lime liquors (Experiment I)
- Table 4 : Analyses of paint (experiment II) (mgEq NaOH/I)
- Table 5 : Assessment of sample plets (experiment II)
- Fig. 1 : Blood vessels and mottle. The collagen fibres are closely woven round the blood vessel and less compactly interwoven elsewhere. The diagram roughly indicates the flow of the fibres in the weave pattern of the pelt
- Fig. 2 : Milk lamb pelt of normal production. The section has not quite gone along the blood vessel and the hatching in the diagram indicates its consequently vaguely pictured path through the pelt in the photomicrograph. Some wool roots (WR) and fat globules (F) are also indicated
- Fig. 3 : Milk lamb of Quikpul production. The section went through some length of the blond vessel shown in the micrograph. Its direction through the pelt is indicated by arrows. The fibre structure is considerably opened up. The wall of the vessel appears relaxed |
| En ligne : |
https://drive.google.com/file/d/1rcZvhmfBGTtkE-SxBu4n76rmlQ-z33U1/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40492 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 62, N° 5 (09-10/1978) . - p. 108-113
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The rapid fellmongering of New Zealand skins in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 62, N° 5 (09-10/1978)
