By-product beneficiation / Karl Flowers in INTERNATIONAL LEATHER MAKER (ILM), N° 44 (11-12/2020)  

[article]  inINTERNATIONAL LEATHER MAKER (ILM) > N° 44 (11-12/2020) . - p. 34-37 Titre : By-product beneficiation Type de document : texte imprimé Auteurs : Karl Flowers, Auteur Année de publication : 2020 Article en page(s) : p. 34-37 Langues : Anglais (eng) Catégories : Chaux Cuirs et peaux -- Déchets -- Recyclage Cuirs et peaux -- Industrie -- Aspect de l'environnement Récupération (Déchets, etc.) Refendage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the waste hierarchy, avoidance and minimisation sit at the apex and shoulc form the oasis of waste management. Closely following avoidance and minimisation, the recovery and re-use parts of waste management are also pivotal. Note de contenu : - Mass balance - Markets and being more than a tanner - Efficiency models - Fig. 1 : The manufacturing process showing inputs and outputs (including by-products) - Fig. 2 : Lime splitting - Fig. 3 : Buffing dust creation - Fig. 4 : Trimming cuts of material to produce a regular shaped leather - Table 1 : Solid waste per tonne of wet-salted material and -500 kg chemicals input - Table 2 : Chemical efficiency per tonne of wet-salted material En ligne : https://drive.google.com/file/d/1psAfkzv1MXpbxIP_7dI4zogRNiINCy-a/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34804 [article]

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Lime splitting - A case study / C. Mance in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 1 (01-02/2000)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 84, N° 1 (01-02/2000) . - p. 6-19 Titre : Lime splitting - A case study Type de document : texte imprimé Auteurs : C. Mance, Auteur Année de publication : 2000 Article en page(s) : p. 6-19 Note générale : Bibliogr. Langues : Français (fre) Catégories : Chaux Fleur du cuir Refendage Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In November 1995 a leading European producer of wet-blue leather commenced a research and development program involving a thorough examination of the in-house leather splitting operation. With an annual production capacity of more than 500,000 hides mostly grain split wet-blue for automotive and furniture upholstery —this wet-blue tanner was committed to the achievement of optimum splitting results that facilitated the production of quality wet-blue. This technical paper includes detailed drawings illustrating specific lime splitting problems experienced by the producer of grain-split wet-blue. a) inconsistent gauge readings after splitting b) breakage of bandknives c) gauge roller and ring roller “wrap arounds” Special emphasis is given to solving lime splitting problems attributable to 1) splitting machine set-up and 2) feed roller selection. Note de contenu : - "REMOVING THE MYSTERY" - WHY SPLIT IN LIME ? : - Key Objectives of Lime Splitting - The swollen limed pelt - The pressure zone - PRELIMINARY OBSERVATIONS OF WET-BLUE PLANT (BEAMHOUSE) En ligne : https://drive.google.com/file/d/1iHv8poQBJqK-0vj2ElHx4LVGJuS1VZgD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41617 [article]

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A new concept of pretanning without chrome / Marcel Siegler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIV (Année 1979)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXIV (Année 1979) . - p. 288-300 Titre : A new concept of pretanning without chrome Type de document : texte imprimé Auteurs : Marcel Siegler, Auteur Année de publication : 1979 Article en page(s) : p. 288-300 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chaux Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés physiques Fleur du cuir Prétannage sans chrome Refendage Stratigraphie Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The manufacture of grain and split leather is simplified by pretanning cattle hides, either after bating or during pickling, with a chromium-free tanning agent until the shrinkage temperature reaches between 170° and 185°F. The pretanned hide is then split to provide a grain and a split intermediate, then these components are shaved and tanned. The entire hide treatment sequence can be effected in two stages : first, beaming, lime fleshing (if necessary), bating, and pretanning before or during pickling ; second, wringing, splitting, sorting, and shaving. The tanning is done after shaving in the the second stage and is followed by coloring and fatliquoring. The resulting chrome-tanned leather has very good physical properties, good fullness, and produces a higher area yield. The pretanned splits can be sorted and shaved for different types of leather, such as vegetable tan, chrome-vegetable tan, etc., and thus be increased in their value. The shavings contain no chromium and very littls salt. Hence they have many moreuses, or they can be disposed of by dumping without significant environmental impact. Much less chrome is needed to tan the leather because the tanning chemicals are used only on the shaved weight. Also, there is less spent chrome to be recycled and reused. The spent liquor can be used either as the float for a new batch of grains or for tanning the splits. Note de contenu : - Table 1 : Shrinkage temperatures at various stages of pretanning process - Table 2 : Take-up of the pretanning product with time of tanning - Table 3 : Chrome distribution by stratigraphic test regular tanning process - Split in blue versus seton special process (SSP) - Table 4 : Comparison of the physical properties of crust leathers derived from hides processed by lime splitting,blue splitting, and the SSP pretanning process - SSP pretanning procedure on regular delimed stock - SSP pretanning procedure on completely delimed stock - Tanning procedure for the grains - Physical properties of SSP leathers En ligne : https://drive.google.com/file/d/1ww_q_dWcvIGk6Usu7pBqWdiTGV_Undii/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37222 [article]

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Section rollers for lime splitting in WORLD LEATHER, Vol. 14, N° 2 (04/2001)  

[article]  inWORLD LEATHER > Vol. 14, N° 2 (04/2001) . - p. 89-94 Titre : Section rollers for lime splitting Type de document : texte imprimé Année de publication : 2001 Article en page(s) : p. 89-94 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Appareils et matériels Cylindre à bagues Refendage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In comparaison to other leather processing equipment, the lime spilling machine requires the greatest amount of operator skill and experience. However, technological advancements in CAD software, machine tools, and manufacturing processes have precipitated improvements in section roller design and construction. V. Mance Manufacturing (VMM) has developed a new continuous "self cleasing" ring roller assembly that facilitates transport of wet and greasy pelts through the splitting machine "pressure zone". The Pro-Split ring roller assembly mnimises lime splitting problems attributable to section roller design, construction and maintenance. This article explains the advent of the ring roller assembly in leather splitting equipment and describes in detail the evolution of section roller design and construction. Note de contenu : - Basic principles of lime splitting - Ring roller assembly selection for lime splitting - Accumulation of solid lime within ring roller assembly - Self-cleasing ring roller assemblies - A final word on technology adoption En ligne : https://drive.google.com/file/d/1X2Yyq5Rrb6H-822bo1qy3jM9dhvpDK6d/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32161 [article]

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The behaviour of pieces in machine operations as a function of temperature and moisture content / Richard Daniels in WORLD LEATHER, Vol. 18, N° 8 (12/2005 - 01/2006)  

[article]  inWORLD LEATHER > Vol. 18, N° 8 (12/2005 - 01/2006) . - p. 36-37 Titre : The behaviour of pieces in machine operations as a function of temperature and moisture content Type de document : texte imprimé Auteurs : Richard Daniels, Auteur ; Walter Landmann, Auteur Année de publication : 2005 Article en page(s) : p. 36-37 Langues : Anglais (eng) Catégories : Cuirs et peaux -- Effets de l'humidité Cuirs et peaux -- Effets de la température Dérayage Echarnage Essorage Mise au vent Opérations mécaniques Refendage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the early mechanical operations much of the focus is on cutting, and for optimum effect the skins must be held flat against the cutting blade or knife. This requires a stretching action for good presentation, which is mainly provided within fleshing and shaving operations by spiral cutting blades on the rotating cylinder. In the splitting operations this is achieved by the helically-grooved gauge roller, and, in part, by the movement of the knife blade, as well as in presentation to the samm/setting operation by the setting cylinder. Over and above the objective of the operation, stretch is involved at the point of contact between the hide and blade. This action can be considerable, and the physical properties of the skin at that time—especially the ease and degree of extendibility, compression and recovery—strongly affect the outcome of the operation. Adjustments are made, both to machine settings and presentation, to achieve the best balance of results. But success is a balance between the way force is applied by the machine and received by the skin. It is an equal partnership, but however sophisticated the machine or perfect the application, variations still occur. The following diagrams provide an insight into the behaviour of mechanically-stressed pieces dependent upon skin condition. Over and above inherent skin variations, as hides and skins progress within manufacture the permutations that generate change increase enormously. Note de contenu : - Panel E10/1 : Presentation of hides and skins to operation versus effect : raw to tanned samm/set condition - Panel E10/2 : Presentation of hides and skins to operation versus effect : splitting ahd shaving En ligne : https://drive.google.com/file/d/1V_MmIOJ6_GLHbKQvRevicU4XfplK8UYc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32504 [article]

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Unveiling a slitter spooler rewinder for industry trials / Graeme Jones in JEC COMPOSITES MAGAZINE, N° 145 (04-05/2022)  

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