EP0437997B1 - Process for a facilitated splitting of hides in the state of intestine - Google Patents
Process for a facilitated splitting of hides in the state of intestine Download PDFInfo
- Publication number
- EP0437997B1 EP0437997B1 EP19900403613 EP90403613A EP0437997B1 EP 0437997 B1 EP0437997 B1 EP 0437997B1 EP 19900403613 EP19900403613 EP 19900403613 EP 90403613 A EP90403613 A EP 90403613A EP 0437997 B1 EP0437997 B1 EP 0437997B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- skins
- hides
- silica
- state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C1/00—Chemical treatment prior to tanning
Definitions
- the present invention relates to a process allowing the easy splitting of skins in the state of tripe or stain.
- the slitting of skins is a classic operation which is widely used in the manufacture of crusts.
- the skins are prepared for ripping by a simple spin but the heterogeneity of the skins between the rump and the sides, even when working in a band, makes this work delicate: defect in thickness, tearing of skins, slipping in the machine, and these phenomena are amplified when working with small skins of sheep or goat.
- the method according to the present invention consists in treating the skins intended to be split with an aqueous silica sol containing 30 to 50% by weight of silica in the form of particles with an average diameter of between 7 and 50 nm. Under preferential conditions for implementing the invention, the above process is carried out in a fuller, at room temperature for 30 to 150 minutes, with from 0.5 to 4% by weight relative to the weight of the skins. treated with an aqueous silica sol containing 30 to 50% by weight of silica in the form of particles with an average diameter of between 7 and 50 nm.
- the aqueous silica sol can be an aqueous anionic silica sol stabilized by aluminum ions, containing 30 to 50% by weight of silica in the state of particles with an average diameter of 7 to 50 nm.
- the aqueous anionic silica soils modified with aluminum ions are in particular described by Ralph K. Iler in The Colloid Chemistry of Silica and Silicates, pages 407-409 Georgia University Press, New York, 1955.
- the average diameter of the silica particles in aqueous silica soils usable in the process of the present invention is an important characteristic.
- the silica particles have a diameter greater than 50 nm
- the treated skins acquire modified mechanical properties; they then have a slightly harder feel and they become less able to be split.
- colloidal silica soils having particles with an average diameter of less than 7 nm they are difficult to obtain industrially and they are consequently expensive.
- Document FR-A-2 396 086 describes the use of alkaline aluminosilicates in fine particles (1-25 "m) insoluble in water for washing and cleaning raw hides and skins.
- Sheep skins of New Zealand origin are treated for two hours at ambient temperature, with 2% by weight relative to the weight of the skins of an aqueous silica sol containing 30% by weight of silica. the state of particles with an average diameter of 9 nm, in a brine bath at 10% by weight of sodium chloride, then the conventional tanning operations are continued until the final stage with intermediate rip on stain.
- a skins of cattle are treated for two hours at room temperature in a fuller, with 1.5% by weight relative to the weight of the skins in the state of tripe, of an aqueous silica sol containing 30% of silica. in the form of particles with an average diameter of 9 nm. After treatment, the skins are drained, wrung by machine and finally split to the desired thickness.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Silicon Compounds (AREA)
- Detergent Compositions (AREA)
Description
La présente invention concerne un procédé autorisant la refente aisée des peaux à l'état de tripe ou de stain.The present invention relates to a process allowing the easy splitting of skins in the state of tripe or stain.
En tannerie, la refente des peaux est une opération classique qui est largement utilisée dans la fabrication des croûtes. Habituellement, après un tannage minéral, ou un pré-tannage, les peaux sont préparées à la refente par un simple essorage mais l'hétérogénéité des peaux entre le croupon et les flancs, même lorsqu'on travaille en bande, rend ce travail délicat : défaut d'épaisseur, déchirure des peaux, glissement dans la machine, et ces phénomènes sont amplifiés lorsqu'on travaille avec des petites peaux de mouton ou de chèvre.In tanning, the slitting of skins is a classic operation which is widely used in the manufacture of crusts. Usually, after a mineral tanning, or a pre-tanning, the skins are prepared for ripping by a simple spin but the heterogeneity of the skins between the rump and the sides, even when working in a band, makes this work delicate: defect in thickness, tearing of skins, slipping in the machine, and these phenomena are amplified when working with small skins of sheep or goat.
Or, la Demanderesse a découvert un nouveau procédé autorisant la refente aisée des peaux à l'état de tripe ou de stain.However, the Applicant has discovered a new process authorizing the easy ripping of skins in the state of tripe or stain.
Le procédé selon la présente invention consiste à traiter les peaux destinées à être refendues avec un sol aqueux de silice contenant pondéralement de 30 à 50 % de silice à l'état de particules d'un diamètre moyen compris entre 7 et 50 nm. Dans des conditions préférentielles de mise en oeuvre de l'invention, le procédé ci-dessus est réalisé dans un foulon, à la température ambiante pendant 30 à 150 minutes, avec de 0,5 à 4 % en poids par rapport au poids des peaux traitées d'un sol aqueux de silice contenant pondéralement de 30 à 50 % de silice à l'état de particules d'un diamètre moyen compris entre 7 et 50 nm.The method according to the present invention consists in treating the skins intended to be split with an aqueous silica sol containing 30 to 50% by weight of silica in the form of particles with an average diameter of between 7 and 50 nm. Under preferential conditions for implementing the invention, the above process is carried out in a fuller, at room temperature for 30 to 150 minutes, with from 0.5 to 4% by weight relative to the weight of the skins. treated with an aqueous silica sol containing 30 to 50% by weight of silica in the form of particles with an average diameter of between 7 and 50 nm.
On peut travailler également en présence d'une saumure contenant pondéralement au moins 5 % de chlorure de sodium, avantageusement avec une saumure de 6 à 8° Baumé. On peut enfin mettre en oeuvre le procédé de l'invention dans le bain de pickelage.It is also possible to work in the presence of a brine containing by weight at least 5% of sodium chloride, advantageously with a brine of 6 to 8 ° Baumé. Finally, the method of the invention can be implemented in the picking bath.
Selon une variante du procédé de la présente invention, le sol aqueux de silice peut être un sol aqueux de silice anionique stabilisé par des ions aluminium, contenant pondéralement de 30 à 50 % de silice à l'état de particules d'un diamètre moyen de 7 à 50 nm. Les sols aqueux de silice anioniques modifiés par des ions aluminium sont notamment décrits par Ralph K. Iler dans The Colloid Chemistry of Silica and Silicates, pages 407-409 Cornell University Press, New York, 1955.According to a variant of the process of the present invention, the aqueous silica sol can be an aqueous anionic silica sol stabilized by aluminum ions, containing 30 to 50% by weight of silica in the state of particles with an average diameter of 7 to 50 nm. The aqueous anionic silica soils modified with aluminum ions are in particular described by Ralph K. Iler in The Colloid Chemistry of Silica and Silicates, pages 407-409 Cornell University Press, New York, 1955.
Le diamètre moyen des particules de silice des sols aqueux de silice utilisables dans le procédé de la présente invention est une caractéristique importante. En effet, lorsque les particules de silice ont un diamètre supérieur à 50 nm, les peaux traitées acquièrent des propriétés mécaniques modifiées ; elles présentent alors un toucher légèrement plus dur et elles deviennent moins aptes à être refendues. Quant aux sols de silice colloïdale présentant des particules d'un diamètre moyen inférieur à 7 nm, ils sont difficiles à obtenir industriellement et ils sont en conséquence onéreux.The average diameter of the silica particles in aqueous silica soils usable in the process of the present invention is an important characteristic. In fact, when the silica particles have a diameter greater than 50 nm, the treated skins acquire modified mechanical properties; they then have a slightly harder feel and they become less able to be split. As for colloidal silica soils having particles with an average diameter of less than 7 nm, they are difficult to obtain industrially and they are consequently expensive.
Le document FR-A-2 396 086 décrit l'utilisation d'aluminosilicates alcalins en fines particules (1-25 »m) insoluble dans l'eau pour le lavage et le nettoyage des peaux et pelleteries brutes.Document FR-A-2 396 086 describes the use of alkaline aluminosilicates in fine particles (1-25 "m) insoluble in water for washing and cleaning raw hides and skins.
Les exemples suivants illustrent la présente invention sans toutefois la limiter.The following examples illustrate the present invention without, however, limiting it.
On traite pendant deux heures à la température ambiante, dans un foulon, des peaux de mouton pickelées d'origine de Nouvelle Zélande, avec 2 % en poids par rapport au poids des peaux d'un sol aqueux de silice contenant pondéralement 30 % de silice à l'état de particules d'un diamètre moyen de 9 nm, dans un bain de saumure de 6° Baumé. Puis on égoutte soigneusement les peaux et on scie à l'épaisseur désirée.Treated for two hours at room temperature, in a fuller, pickled sheep skins of New Zealand origin, with 2% by weight relative to the weight of the skins of an aqueous silica sol containing 30% by weight of silica in the form of particles with an average diameter of 9 nm, in a 6 ° Baumé brine bath. Then carefully drain the skins and saw to the desired thickness.
On traite pendant deux heures à la température ambiante, dans un foulon, des peaux de mouton d'origine de Nouvelle Zélande, avec 2 % en poids par rapport au poids des peaux d'un sol aqueux de silice contenant pondéralement 30 % de silice à l'état de particules d'un diamètre moyen de 9 nm, dans un bain de saumure à 10 % en poids de chlorure de sodium, puis les opérations de tannage classiques sont poursuivies jusqu'au stade final avec refente intermédiaire sur stain.Sheep skins of New Zealand origin are treated for two hours at ambient temperature, with 2% by weight relative to the weight of the skins of an aqueous silica sol containing 30% by weight of silica. the state of particles with an average diameter of 9 nm, in a brine bath at 10% by weight of sodium chloride, then the conventional tanning operations are continued until the final stage with intermediate rip on stain.
On traite pendant deux heures à la température ambiante, dans un foulon, des peaux de bovins avec 1,5 % en poids par rapport au poids des peaux à l'état de tripe, d'un sol aqueux de silice contenant 30 % de silice à l'état de particules d'un diamètre moyen de 9 nm. Après traitement, les peaux sont égouttées, essorées à la machine et enfin refendues à l'épaisseur désirée.A skins of cattle are treated for two hours at room temperature in a fuller, with 1.5% by weight relative to the weight of the skins in the state of tripe, of an aqueous silica sol containing 30% of silica. in the form of particles with an average diameter of 9 nm. After treatment, the skins are drained, wrung by machine and finally split to the desired thickness.
Dans les trois exemples précédents, on obtient des peaux à l'état de croûte et de fleur présentant un plein sélectif, une finesse de fleur et dont le sciage des stains a été facile : pas de glissement dans la machine, bonne régularité d'épaisseur, pas de déchirure.In the three previous examples, we obtain skins in the crust and flower state with a selective fullness, a finesse of flower and whose sawing of the stains was easy: no slipping in the machine, good regularity of thickness , no tears.
On obtient ainsi des peaux à l'état de croûte et de fleur présentant un plein sélectif, une finesse de fleur et dont le sciage des stains a été facile : pas de glissement dans la machine, bonne régularité d'épaisseur, pas de déchirure.Skins in the crust and flower state are thus obtained, with a selective fullness, a finesse of flower and the sawing of the stains was easy: no slipping in the machine, good regularity of thickness, no tearing.
Claims (4)
- Process which allows the easy splitting of hides as pelts or crust leather, characterized in that the hides intended to be split are treated with an aqueous silica sol containing 30 to 50% by weight of silica in the form of particles with an average diameter between 7 and 50 nm.
- Process according to claim 1, characterized in that 0.5 to 4% by weight relative to the weight of hides of an aqueous silica sol containing 30 to 50% by weight of silica in the form of particles with an average diameter between 7 and 50 nm is used.
- Process according to claim 1 or 2, characterized in that the silica sol used is stabilized by aluminium ions.
- Process according to any one of claims 1 to 3, characterized in that it is carried out in the presence of a brine containing at least 5% by weight of sodium chloride.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8917255 | 1989-12-27 | ||
| FR8917255A FR2656332B1 (en) | 1989-12-27 | 1989-12-27 | PROCESS AUTHORIZING THE EASY HANDLING OF SKINS IN THE TRIP OR STAIN CONDITION. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0437997A1 EP0437997A1 (en) | 1991-07-24 |
| EP0437997B1 true EP0437997B1 (en) | 1994-07-13 |
Family
ID=9389012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19900403613 Expired - Lifetime EP0437997B1 (en) | 1989-12-27 | 1990-12-14 | Process for a facilitated splitting of hides in the state of intestine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0437997B1 (en) |
| DE (1) | DE69010654T2 (en) |
| ES (1) | ES2057491T3 (en) |
| FR (1) | FR2656332B1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2666097B1 (en) * | 1990-08-21 | 1992-12-11 | Hoechst France | PROCESS FOR SHELLING SKINS. |
| FR2686099B1 (en) * | 1992-01-14 | 1994-11-25 | Hoechst France | APPLICATION OF SILICA SOILS TO OBTAIN A WHITE SKIN STABILIZED PICKLE WHITE OR STABILIZED WHITE. |
| EP0583697A2 (en) * | 1992-08-14 | 1994-02-23 | Hoechst Aktiengesellschaft | Tanning process saving chrome and improved fixing of chrome |
| FR2707666B1 (en) * | 1993-06-30 | 1995-09-15 | Procalp | Method and agent for the protection of collagenic materials, in particular of skins. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2728812A1 (en) * | 1977-06-27 | 1979-01-18 | Henkel Kgaa | USE OF FINE PARTICULAR WATER-INSOLUBLE ALKALINE SILICATES FOR WASHING AND CLEANING RAW SKIN AND FUR SKINS |
-
1989
- 1989-12-27 FR FR8917255A patent/FR2656332B1/en not_active Expired - Lifetime
-
1990
- 1990-12-14 DE DE1990610654 patent/DE69010654T2/en not_active Expired - Fee Related
- 1990-12-14 EP EP19900403613 patent/EP0437997B1/en not_active Expired - Lifetime
- 1990-12-14 ES ES90403613T patent/ES2057491T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE69010654D1 (en) | 1994-08-18 |
| DE69010654T2 (en) | 1995-03-16 |
| FR2656332B1 (en) | 1992-04-30 |
| ES2057491T3 (en) | 1994-10-16 |
| EP0437997A1 (en) | 1991-07-24 |
| FR2656332A1 (en) | 1991-06-28 |
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