Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Treatment of untanned skins or hides
Patent
1997-02-24
1999-02-09
Diamond, Alan
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Treatment of untanned skins or hides
8 9416, 8 9417, 8 9418, 8 9419R, 8 942, 8 9427, 8148, 8150, 81505, 69 19, 69 191, 69 192, 69 193, C14B 126, C14C 1500
Patent
active
058687980
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/AU95/00524 filed Aug. 23, 1995.
This invention relates to the treatment of skins and hides including green and dehydrated skins and hides which, for convenience, will be called "hides" throughout this specification.
The presently used process for treating animal hides so as to produce leather involves batch operations in which hides are immersed successively in different liquids for long periods. This is a time consuming process and large volumes of contaminated spent liquids result, with disposal presenting a substantial problem.
In the presently used process of tanning a hide there are a number of operations which may be carried out from dehairing to tanning and dyeing as identified in the right hand side of FIG. 1. One of the main function is to remove unwanted substances such as soluble proteins since these can degrade over time and reduce the quality or value of the leather. It has been considered essential that mechanical action in the presence of the particular fluid was necessary to help work these proteins out of the hide structure once denatured by the chemicals. To provide this mechanical action, it is considered to be necessary that the material needs to be subject to soaking and agitation in the conventional manner using rotary drums or paddles.
It is an object of the present invention to provide a process and apparatus for the treatment of hides which can enable effective and efficient processing operations involving exposure of the hide to treatment fluids.
It is a preferred object to provide a process and apparatus in which sequential hide treatment operations can be carried out on a continuous basis.
It is a further preferred object to provide a hide treatment process and apparatus enabling elimination of at least some batch processing stages involving soaking and agitation of hides and additionally the resulting generation of large volumes of liquid requiring subsequent treatment and disposal.
According to a first aspect of the invention there is provided a process for treating an animal hide comprising the following sequential steps: enhance penetration of treatment fluids into the structure of the hide; that the hide is held in the frame for further processing, the step of mounting the hide in the frame comprising mounting edge attachments at points around the perimeter of the hide and coupling the edge attachments by ties to the mounting frame; as to treat the hide with that fluid, the first treatment fluid being selected from depilitant, liming, deliming, bating, pickling and tanning fluids; and treating it for reuse or disposal; the frame so as to treat the hide with that second treatment fluid without the hide having been removed from the frame after application of the first treatment fluid, the second treatment fluid being selected from liming, deliming, bating, pickling, tanning and dyeing fluids; hide and treating it for reuse or disposal; and second and any subsequent treatment fluids so as to release the tension applied to the hide.
In this first aspect of the invention, by retaining the hide stretched in a frame to an extent sufficient to open the hide structure, several different treatment fluids can be sequentially applied so that substantially continuous processing of each hide is possible.
In one preferred embodiment, the hide is treated by multiple treatment fluids applied sequentially to the hide while stretched and mounted in the mounting frame prior to and including treatment by a tanning fluid whereby the increase in surface area of the hide effected by stretching the hide to open the hide structure becomes fixed yielding a tanned hide of greater surface area than the hide prior to stretching and mounting in the mounting frame.
According to a second aspect of the invention there is provided a process for treating an animal hide comprising the following sequential steps: treatment station; and station at a pressure differential across the thickness of the hide so that the treatment fluid penetrates into and, under the action of the pres
REFERENCES:
patent: 4202190 (1980-05-01), Viljanmaa
patent: 4333731 (1982-06-01), Schindlmayr et al.
patent: 4438570 (1984-03-01), Dokoupil
patent: 4487041 (1984-12-01), duBourg
patent: 5291759 (1994-03-01), Dokoupil
Anderson Colin Charles
Obst Yuri Ronald
Waters Brian
Diamond Alan
Flanagan John K.
Flanagan John R.
Tanning Technologies Pty Ltd
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