US1974889A - Preparation of hides or skins for tanning - Google Patents

Preparation of hides or skins for tanning Download PDF

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Publication number
US1974889A
US1974889A US592187A US59218732A US1974889A US 1974889 A US1974889 A US 1974889A US 592187 A US592187 A US 592187A US 59218732 A US59218732 A US 59218732A US 1974889 A US1974889 A US 1974889A
Authority
US
United States
Prior art keywords
skins
tanning
hides
per cent
preparation
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
Application number
US592187A
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English (en)
Inventor
Biedermann Robert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Firm J R Geigy S A
Firm J R Geigy S A
Original Assignee
Firm J R Geigy S A
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Firm J R Geigy S A filed Critical Firm J R Geigy S A
Application granted granted Critical
Publication of US1974889A publication Critical patent/US1974889A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C14C1/06—Facilitating unhairing, e.g. by painting, by liming
    • C14C1/065—Enzymatic unhairing
    • 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 usual process of preparing hides or skins for tanning consists either in first liming the softened hide or skin, then de-hairing it and finally bating it, or in conducting the removal of 5 hair with the aidof enzymes comprising as essential constituent tryptic ferments; in both cases a strong alkaline pre-treatment is necessary.
  • the ore-treatment has great disadvantages; by partial degradation of the protein substances of the hide, there is a more or less considerable loss of weight. This, however, cannot be avoided, since tryptic ierments alone cannot loosen the hair. This last fact is understandable from the new investigations of Waldschmidt- Leitz and his co-workers, as well as of Grassmann and his coworkers (see Collegium 1931, Ref. page 157), for the tryptic ferments are greatly hindered in their action by the degradation products of the keratins concerned in the structure of hair.
  • an alkaline pretreatment of the hide or skin is avoided by use of the catheptic ferments (see Waldschmidt-Leitz, Zeitschrift fiir physio strige Chemie 188, page 1? (1929/)) for the preparatory process, it having been found that these ferments are directly activated by the degradation products of the keratin so that the loosening of the hair and the hating may be conducted in a single operation.
  • Other activators may also be added, such as substances having a reducing action, for example sulphur compounds of an inorganic or organic nature, such as sodium hydrosulphide, thiosulphuric acid, thioglycolic acid etc.
  • a further advantage of the invention resides in the fact that the maximum effect of the catheptic ferments lies at a pH-value between 7 and 5, whereby the treatment becomes one which improves the skin and is practically unaccompanied by loss.
  • a process for preparing with the use of ferments hides or skins for tanning consisting in treating the softened hide or skin with an aque ous extract of an animal organ containing cathepsin with addition of an activating substance having a reducing effect.
  • a process for preparing with the use of ferments hides or skins for tanning consisting in treating the softened hide or skin with an aqueous extract of an animal organ containing cathepsin with addition of a sulphur compound having a reducing eifect.

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)
  • Cosmetics (AREA)
US592187A 1931-02-21 1932-02-10 Preparation of hides or skins for tanning Expired - Lifetime US1974889A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB148549A DE579634C (de) 1931-02-21 1931-02-21 Verfahren zur Herstellung gerbfertiger Bloessen aus tierischen Haeuten und Fellen

Publications (1)

Publication Number Publication Date
US1974889A true US1974889A (en) 1934-09-25

Family

ID=89508730

Family Applications (1)

Application Number Title Priority Date Filing Date
US592187A Expired - Lifetime US1974889A (en) 1931-02-21 1932-02-10 Preparation of hides or skins for tanning

Country Status (6)

Country Link
US (1) US1974889A (cs)
BE (1) BE386467A (cs)
DE (1) DE579634C (cs)
ES (1) ES125660A1 (cs)
FR (1) FR731445A (cs)
GB (1) GB398524A (cs)

Also Published As

Publication number Publication date
GB398524A (en) 1933-09-15
BE386467A (cs) 1932-03-31
FR731445A (fr) 1932-09-02
ES125660A1 (es) 1932-03-01
DE579634C (de) 1933-06-29

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