WO1997008346A1 - Process for the treatment of hides - Google Patents
Process for the treatment of hides Download PDFInfo
- Publication number
- WO1997008346A1 WO1997008346A1 PCT/EP1996/003656 EP9603656W WO9708346A1 WO 1997008346 A1 WO1997008346 A1 WO 1997008346A1 EP 9603656 W EP9603656 W EP 9603656W WO 9708346 A1 WO9708346 A1 WO 9708346A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hides
- weight
- treatment
- mixture
- composition
- Prior art date
Links
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
- C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
- C14C9/02—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring
Definitions
- the present invention relates to the treatment of hides for the production of shoes, handbags, belts and the like.
- the invention relates to a process for the treatment of hides comprising their vegetable tanning, and more precisely for the so-called stuffing stage; the invention also relates to compositions of fatty substances that can be used for the said stuffing stage.
- salts generally sodium chloride
- acids such as formic, hydrochloric or sulphuric acid
- tanning proper effected by treating the hides in drums with concentrated extracts of various vegetable materials rich in tannins, for example the bark of oak, chestnut, holm oak, birch, wood of quebracho, cherry plums, fruit of the algoravilla, etc., also using, if necessary, synthetic tannins such as tanning auxiliaries;
- the problem at the root of the present invention is that of making available a process for the treatment of hides comprising vegetable tanning thereof, which process makes it possible to obtain a hide that has characteristics of softness to the touch superior to those obtained hitherto with known processes.
- the aforementioned mixture of fatty substances preferably contains, as percentages by weight relative to the total weight of the mixture, 55-65% of tallow, 12-17% of marine animal oil and 22-27% of oxidized marine animal oil.
- the aforementioned compression is preferably carried out at a pressure of 380-420 atmospheres, using a plate press.
- drum used in the treatment described above it is preferable for the drum used in the treatment described above to be rotated at a speed of 16-18 rev/min.
- Drum treatment of the hides with the mixture of fatty substances generally takes from 1.5 to 4 hours.
- the aforementioned mixture of fatty substances prefferably contain from 0.3 to 1.0% of a fungicide.
- the hide obtained by the process according to the invention can then be sent to the usual stages of smoothing and drying and to optional stages of finishing, polishing, stamping, etc., before being used for the manufacture of leather goods, shoe uppers, etc.
- the hide produced using the process of the invention is characterized, relative to all hides produced hitherto using known processes of the art, in that it has a very special "handle" that is immediately recognizable by any person skilled in the art. That is, the hide is extremely and pleasantly soft to the touch, though without displaying excessive yielding, and on the contrary exhibiting excellent properties of resistance to mechanical deformation.
- the special handle of the hide obtained with the process according to the invention is due both to the particular way in which the hide is prepared during the stuffing stage and to the specific composition of fatty substances used for that stage.
- the stage of compression to which the hide is subjected has the purpose of adjusting its moisture content to an ideal value for penetration of the fatty substances during the subsequent stage of stuffing.
- An excessively high moisture content would not permit sufficient and uniform penetration of the fatty substances, producing a hide with a handle that is too "greasy” and therefore too yielding.
- composition of the mixture of fatty substances used for the stuffing stage is critical for achieving an optimum result in terms of handle of the final hide.
- An excessive deviation from the ranges stated for the various components can result in hides that are too dry or conversely too soft and characterized by a greasy handle.
- EXAMPLE 1 750 "shoulders" (i.e. those portions of hide corresponding to the neck) of hides of adult cow each weighing approx. 5.5-5.8 kg were subjected to the usual stages of the conventional process of vegetable tanning described above.
- the hides were then again divided into three lots of 250 hides each and each lot was placed in a drum with a diameter of 3 metres and a volume of approx. 11 m* .
- composition shown above was prepared by adding the tallow, made fluid by heating at 60°C, to the mixture of the other components and allowing the whole to cool to room temperature.
- the hides were, kept in contact with the aforementioned mixture for about 3.5 hours in the drum, rotating at a speed of 16 rev/min, until the temperature of the hides reached a value of 34°C.
- the final product obtained from the drying stage had a fatty substance content equal to 21% by weight.
- EXAMPLE 2 750 hides treated as in the preceding Example and each with an average weight of about 3.75 kg, a thickness of 2.3 mm and a pH of around 3.5 were put on top of one another to form three stacks of 250 hides each; each stack was placed on a plate press and compressed at a pressure of 420 atmospheres for 4 hours.
- the hides were then again divided into three lots of 250 hides each and each lot was placed in a drum with a diameter of 3 metres and a volume of approx. 11 3 .
- the hides were kept in contact with the aforementioned mixture for about 4 hours in the drum rotating at a speed of 18 rev/min, until the temperature of the hides reached a value of 35°C.
- the final product obtained from the drying stage had a fatty substance content equal to 19% by weight.
- the hides were then again divided into three lots of 250 hides each and each lot was placed in a drum with a diameter of 3 metres and a volume of approx. 11 m 3 .
- the hides were kept in contact with the aforementioned mixture for about 3 hours in the drum rotating at a speed of 18 rev/min, until the temperature of the hides reached a value of 34°C.
- the final product obtained from the drying stage had a fatty substance content equal to 22% by weight.
- the hides prepared according to the above examples all possessed handle characterized by extreme softness yet accompanied by characteristics of excellent elasticity and resistance to mechanical deformation.
- composition of fatty substances used in the process according to the invention offers the advantage that it i ⁇ absolutely stable and can be stored perfectly at room temperature for long periods of time. It is not therefore necessary for the composition to be prepared at the very moment of application of the process according to the invention, on the contrary it can be prepared in great quantities, to meet the needs of production for several weeks.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT96929284T ATE203059T1 (en) | 1995-08-30 | 1996-08-20 | METHOD FOR TREATING ANIMAL SKINS |
AU68749/96A AU6874996A (en) | 1995-08-30 | 1996-08-20 | Process for the treatment of hides |
DE69613844T DE69613844D1 (en) | 1995-08-30 | 1996-08-20 | METHOD FOR TREATING ANIMAL SKINS |
EP96929284A EP0847453B1 (en) | 1995-08-30 | 1996-08-20 | Process for the treatment of hides |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI951830A IT1260161B (en) | 1995-08-30 | 1995-08-30 | PROCESS FOR THE PROCESSING OF LEATHER |
ITMI95A001830 | 1995-08-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997008346A1 true WO1997008346A1 (en) | 1997-03-06 |
Family
ID=11372201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1996/003656 WO1997008346A1 (en) | 1995-08-30 | 1996-08-20 | Process for the treatment of hides |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0847453B1 (en) |
AT (1) | ATE203059T1 (en) |
AU (1) | AU6874996A (en) |
DE (1) | DE69613844D1 (en) |
IT (1) | IT1260161B (en) |
WO (1) | WO1997008346A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1241270A1 (en) * | 2001-03-13 | 2002-09-18 | GE.MA.TA. S.p.A. | Dying, greasing and fixation/finishing procedure of leather |
EP1402561A1 (en) * | 2001-05-25 | 2004-03-31 | Analytica Of Branford, Inc. | Atmospheric and vacuum pressure maldi ion source |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB773825A (en) * | 1954-02-18 | 1957-05-01 | Nopco Chem Co | Fat-liquoring compositions |
US4285688A (en) * | 1979-03-28 | 1981-08-25 | Leather Life, Inc. | Saddle oil |
SU1493679A1 (en) * | 1987-01-12 | 1989-07-15 | Опытное конструкторско-технологическое бюро по интенсификации тепломассообменных процессов Института технической теплофизики АН УССР | Method of producing soft leather |
-
1995
- 1995-08-30 IT ITMI951830A patent/IT1260161B/en active IP Right Grant
-
1996
- 1996-08-20 AT AT96929284T patent/ATE203059T1/en not_active IP Right Cessation
- 1996-08-20 AU AU68749/96A patent/AU6874996A/en not_active Abandoned
- 1996-08-20 DE DE69613844T patent/DE69613844D1/en not_active Expired - Lifetime
- 1996-08-20 EP EP96929284A patent/EP0847453B1/en not_active Expired - Lifetime
- 1996-08-20 WO PCT/EP1996/003656 patent/WO1997008346A1/en active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB773825A (en) * | 1954-02-18 | 1957-05-01 | Nopco Chem Co | Fat-liquoring compositions |
US4285688A (en) * | 1979-03-28 | 1981-08-25 | Leather Life, Inc. | Saddle oil |
SU1493679A1 (en) * | 1987-01-12 | 1989-07-15 | Опытное конструкторско-технологическое бюро по интенсификации тепломассообменных процессов Института технической теплофизики АН УССР | Method of producing soft leather |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Week 9017, Derwent World Patents Index; AN 90130979, XP002017561 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1241270A1 (en) * | 2001-03-13 | 2002-09-18 | GE.MA.TA. S.p.A. | Dying, greasing and fixation/finishing procedure of leather |
EP1402561A1 (en) * | 2001-05-25 | 2004-03-31 | Analytica Of Branford, Inc. | Atmospheric and vacuum pressure maldi ion source |
EP1402561A4 (en) * | 2001-05-25 | 2007-06-06 | Analytica Of Branford Inc | Atmospheric and vacuum pressure maldi ion source |
Also Published As
Publication number | Publication date |
---|---|
DE69613844D1 (en) | 2001-08-16 |
EP0847453A1 (en) | 1998-06-17 |
ITMI951830A0 (en) | 1995-08-30 |
ATE203059T1 (en) | 2001-07-15 |
IT1260161B (en) | 1996-04-02 |
EP0847453B1 (en) | 2001-07-11 |
AU6874996A (en) | 1997-03-19 |
ITMI951830A1 (en) | 1997-03-02 |
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