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[article]
Titre : |
The autosplit and the most favorable process stage for splitting hides |
Type de document : |
texte imprimé |
Auteurs : |
Ranier Dorstewicz, Auteur |
Année de publication : |
2006 |
Article en page(s) : |
p. 287-298 |
Note générale : |
Bibliogr. |
Langues : |
Américain (ame) |
Index. décimale : |
675 Technologie du cuir et de la fourrure |
Résumé : |
The task for the author was to develop a new lime splitting system with thickness control for lime splitting comparable to that achieved for splitting after chrome tanning. Additionally, collaboration with Professor Heidemann at the Technical University in Darmstadt was very beneficial; the "Darmstädter Feed-Through System" was developed in the 1970's and 1980's. Our new approach begins when fresh bovine hides are sprayed from the hair side with a 10 % sodium sulphide solution and after approximately 10 minutes the loosened hair mechanically removed. Afterwards, the native underside of the hide is fleshed and split. Because of the painting on the hair side with highly concentrated sodium sulphide, the hide will not swell; the thickness of the grain split is almost identical with the thickness of that split after chrome tanning. As an essential innovation, a plastic belt leads the hide on the flesh side into the machine. A water-film between the underside of the hide and the surface of the belt reduces friction. The pelt is grasped only by the grain side, at first, from a transport roller with a large diameter and is supplied to a gauge roller. Two pneumatic tubes support the hide. This supporting force can be modulated by varying both the position and by the effective pressure of pneumatic bolsters below the plastic belt. Because the transport roller is 13 % greater in diameter toward the outer edges than in the middle, the hide is transported in the edge area at higher speed into the splitting zone. This is an important condition, to counter the tendency to drag the flanks without intervention of the working staff. This opens up the possibility of feeding the lime splitter automatically from a conveyor - therefore the name AUTOSPLIT. Because of the larger diameter of the feeding roller and the wide intensive contact with the grain, the hide is seized immediately. Drift of the hide, caused by the cutting band-knife even when splitting extremely slippery pelts, is eliminated. An automatic cleaning by nozzles spraying high-pressure water combined with reversing of both the transport roller and the gauge roller after every splitting prevents built up of hide fibers, making opening of the machine for cleaning largely unnecessary. This simultaneously increases productivity and quality of splitting. In summary, the AUTOSPLIT accomplishes these objectives: 1) splitting very slippery pelts without being pulled sidewise by the splitting knife; 2) a good splitting and equalizing of thin hides; 3) elimination of the section roller system which eliminates problems with thin flesh splits and accumulation of hide fibres and 4) easy feeding of the limed hides and spreading out the hides without physical strain on the operating team. |
En ligne : |
https://drive.google.com/file/d/1pTyUYzcH7fcmjD5E1OmjEto9k7nwXe_Z/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3993 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 8 (08/2006) . - p. 287-298
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