US1774626A - Method of treating leather - Google Patents

Method of treating leather Download PDF

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Publication number
US1774626A
US1774626A US211003A US21100327A US1774626A US 1774626 A US1774626 A US 1774626A US 211003 A US211003 A US 211003A US 21100327 A US21100327 A US 21100327A US 1774626 A US1774626 A US 1774626A
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US
United States
Prior art keywords
skins
skin
salt
treating
tanned
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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US211003A
Inventor
Allen Dorothea
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GEORGE EDWIN MAURER
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GEORGE EDWIN MAURER
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Publication date
Application filed by GEORGE EDWIN MAURER filed Critical GEORGE EDWIN MAURER
Priority to US211003A priority Critical patent/US1774626A/en
Application granted granted Critical
Publication of US1774626A publication Critical patent/US1774626A/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
    • C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes

Definitions

  • the present invention relates to a method of treating leather and to the product produced thereby.
  • the process consists in what might be called a tlensifying process. as examination of the product indicates an apparent lessening of the intercellular spaces and a thickening of the cell walls with a very great increase in tensile strength. and involves a treatment preferably intermediate the tanning and finishing steps.
  • the preferred method comprises placing the still wet skin from the tanning process. in a solution of a deliquescent salt that has no chemical affinity for the tanned skin. leaving the skin in said solution sufiiciently long for the salt After a sufficient time has elapsed usually from one to one and one half hours. the skin is by any suitable method. such as rolling then taken from the solution. the excess water removed. and allowed to drv.
  • the preferred method involves the soaking of the skin in the solution of the treating salt. This step may also be carried out by sprinkling a solution of the salt upon the skin or the dry salt sprinkled thereon and folded or rolled up in the wet skin.
  • the preferred treatment is with a 10 to 30% solution of calcium chloride but magnesium chloride may be substituted with good results.
  • ferric chloride may also be used to produce the desired densitying.
  • bark tanned or chrome tanned skins may be treated in the process and these may be either with or Without the naturally attached hair on them as the treatmentdoes not in any way atfect the hair except to thicken the fur by the reduction in area of the skin.
  • the treatment may be applied to any kind of tanned skins. itis most beneficial for such skins as sheepskins or any that ordinarily are soft, spongy and of little strength.
  • cowhides such as the belly and sides may be lessened in areaand increased in thickness and ,in tensile strength by said process and thus made suitable for applications where heretofore only selected portions have been considered fit.
  • I claim 1 The process of treating tanned skins of animals which comprises in'ipregnating said skins with a salt inert to the tanned hide substance and capable of absorbing water, drying the impregnated skin and halt-- ing the shrinkage thereby produced at the desired point by Washing out the salt, and subsequently finishing the product.

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  • 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)

Description

Patented Sept. 2, 1930 UNITED STATES PATENT OFFICE WILLIAM H. ALLEN. OF DETROIT. MICHIGAN; DOROTHEA ALLEN. EXECUTRIX OF SAID WILLIAM H. ALLEN, DECEASED. ASSIGNOR TO GEORGE EDWIN MAURER, OF PHILA- DELPHIA, PENNSYLVANIA METHOD OF TREATING LEATHER No Drawing.
The present invention relates to a method of treating leather and to the product produced thereby.
Heretofore in the production of leather from the skins of certain animals. the products are limited in their application. and. therefore their value. by reason of the fact that they are soft and spongy and of little strengthand resistance to wear and distortion.
Among the objects of the present invention is to overcome such objections and to prodiu-e a leather t'rom these same kinds of .skins which has much greater body, is
to dialyse into the membranes.
tough and strong and is capable of being used satisfactorily for purposes for which it was not before adapted.
The process consists in what might be called a tlensifying process. as examination of the product indicates an apparent lessening of the intercellular spaces and a thickening of the cell walls with a very great increase in tensile strength. and involves a treatment preferably intermediate the tanning and finishing steps.
In carrying out the process. the preferred method comprises placing the still wet skin from the tanning process. in a solution of a deliquescent salt that has no chemical affinity for the tanned skin. leaving the skin in said solution sufiiciently long for the salt After a sufficient time has elapsed usually from one to one and one half hours. the skin is by any suitable method. such as rolling then taken from the solution. the excess water removed. and allowed to drv.
Application filed August 5. 1927.
In the drying. the skin shrinks uniformlv.
Serial No. 211,003.
finished. While the preferred method involves the soaking of the skin in the solution of the treating salt. this step may also be carried out by sprinkling a solution of the salt upon the skin or the dry salt sprinkled thereon and folded or rolled up in the wet skin.
The preferred treatment is with a 10 to 30% solution of calcium chloride but magnesium chloride may be substituted with good results.
In those cases where the color produced will not be objectionable ferric chloride may also be used to produce the desired densitying.
The action seems to be due to an abstraction of the last traces of uncombined water from the hide substance.
Further. either bark tanned or chrome tanned skins may be treated in the process and these may be either with or Without the naturally attached hair on them as the treatmentdoes not in any way atfect the hair except to thicken the fur by the reduction in area of the skin. Also while, the treatment may be applied to any kind of tanned skins. itis most beneficial for such skins as sheepskins or any that ordinarily are soft, spongy and of little strength.
The softer parts of cowhides such as the belly and sides may be lessened in areaand increased in thickness and ,in tensile strength by said process and thus made suitable for applications where heretofore only selected portions have been considered fit.
Now having described the invention and the preferred forms of embodiment thereof, it is to be understood that the said invention is to be limited not to the specific details herein set forth but only by the scope of the claims which follow.
I claim 1. The process of treating tanned skins of animals which comprises in'ipregnating said skins with a salt inert to the tanned hide substance and capable of absorbing water, drying the impregnated skin and halt-- ing the shrinkage thereby produced at the desired point by Washing out the salt, and subsequently finishing the product.
2. The process of treating tanned skins of animals which comprises impregnating said skins with calcium chloride, drying the impregnated skin and halting the shrinkage thereby produced at the desired point by washing out the salt, and subsequently finishing the product.
3. The process of treating tanned skins of animals which comprises soaking the wet skins from the tanning process in a solution of calcium chloride until thoroughly impregnated, drying said skins and thereby causing shrinkage, stopping said shrinkage at the desired point by washing out the calcium chloride, and subsequently finishing the so treated leather.
' WILLIAM H. ALLEN.
US211003A 1927-08-05 1927-08-05 Method of treating leather Expired - Lifetime US1774626A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US211003A US1774626A (en) 1927-08-05 1927-08-05 Method of treating leather

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5500020A (en) * 1993-10-15 1996-03-19 Bandino; Giacomo Process for titanium-based mixed tannings

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5500020A (en) * 1993-10-15 1996-03-19 Bandino; Giacomo Process for titanium-based mixed tannings

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