US1455655A - Vittobio peradotto - Google Patents

Description

May -15, 1923. 1,455,655

V. PERADOTTO PROCESS OF'AND MEANS FOR TANNING HIDES Filed April 15. 1922 Snow: lfo'c Vittorio Perado'trto Patented May 15, 1923.

VITTOBIO PERADOTTO, 0F GALLENCA, TURIN, ITALY.

PROCESS OF AND MEANS FOR TANNING HIDES.

Application filed April 15, 1922.

7 '0 all whom it may concern:

Be it known that I, Vrrronro PERADOTTO, manufacturer, a citizen of the Kingdom of Italy, residing at Valperga, Gallenca, Turin, Italy, have invented certain new and useful Improvements in Process of and Means for Tanning Hides, of which the following is a full, clear, and exact specification.

This invention relates to an improved process for tanning hides and means to put it into practice, and has for its object to provide an improved basin or vat, allowing the hides and skins to be continuously and completely tanned, reducing the cost of manufacture and improving the results of the tanning process. I

According to the present invention the skins or hides are suspended within the vat so that they hang in the tanning bath therein, the liquid being continuously put in rapid and strong motion thus carrying away the tanning solid matters in suspension in the bath.

One of the characteristic features of the tanning process according to the present invention consists in the fact that heating does not form a constituent element of the process, while by the tanning processes heretofore used the baths have been heated to a suitable temperature, of about 38-40 C. On the contrary, the tanning bath referred to in this invention needs only to be heated during the winter, and it does not have to be heated in winter, even, if there is no danger of the liquid bath freezing.

' I the accompanying drawings there is shown by way of example a structural form of vat having the characteristic features of the present invention, but it will be understood that in actual practice the shape and dimensions may vary without departing from the principle of the present invention.

Figure 1 is a plan view of the vat.

Figure 2 a longitudinal section on the line A-B of Figure 1, and

Figure 3 a transverse section taken on the line C-D of Figure 1.

The perimetric wall 1 of the vat, and the partition 2 which divides the vat longitudinally are both provided at their upper edge with projections or ledges 3 upon which are supported the ends of the bars or trans verse supports arranged transversely between the outer wall and the partition. Upon these transverse bars there are supported,

Serial No. 553,112.

in the longitudinal direction of the vat, sticks upon which the hides to be tanned are arranged in such a manner that they depend on both sides of the sticks or as an alternative the hides may be hooked to the transverse bars by means of hooks fitting into small chains of suitable type; Either sticks or chains with their hooks are completely immersed below the level of the bath. Thus suspended, below the level of the liquid in the vat, the hides hang down and are completely immersed in the liquid itself.

At one of the ends of the vat, or it may be at any suitable point, there is mounted upon a shaft 4 a vane wheel 5 or any other suitable agitator or beater such a screw for instance. The said shaft may be placed in motion by means of the necessary pulleys, through a driving shaft 6. The heater dips to a sufficient extent in the bath producing the tannage, or it may also be completely immersed therein so that its rotation sets up in the bath itself a continual circulation, for instance in the direction indicated by the arrows 7. y

The circulatory movement of the liquid, which takes place in the longitudinal direction of the vat, imparts a continual shaking and oscillating movement of the hides, suspended in the same direction and accelerates the tanning action of the bath.

Differing from the other tanning systerns hitherto employed, the circulatory movement of the tanning liquid in the present system is so rapid that the li uid carries away the fragments and waste its of'bark which are found in the bath and which add their mechanical scraping action to the chemical effects of the tanning bath. In the vat according to the present invention the liquid may attain the speed of metres per minute whilst, in other systems, the speed of circulation is very small.

This type of vat is adapted to be subdividecl into several parts, so as to reduce the capacity thereof. To this end the partition wall may have one or more interruptions or openings 8 extending over the whole height of the said wall. Upon a pillar or prop of these openings as at 9, there may be pivoted the doors 10 which, turning in the direction indicated by the arrow 11 (Figure 1) can be turned round against the opposite pillar 12, thus forming a continuation of the dividing wall 2. If, on

the contrary, they are allowed to remain in the position shown in the drawing they restrict the circulation of the bath in the vat at the portion which is comprised between them and the agitator thus reducing" its capacity, in relation to the point oi the dividing wall in which the opening; under consideration is made. This step is necessitated when it is desired to limit working to one part of the vat only, in orde to empty and dry one or more of the other sections.

In order to facilitate working the said doors may also he replaced by movable partitions of any other nature, by suitably modifying the relative supports in the pillars andin the outer wall of the vat. During the winter this type of vat may be provided with circulatory heating element arranged along the bottom of the walls, for example, so as to raise the temperature of the bath above the natural temperature, although heat does not come into consid eration as a constituent element of the tern at present set forth. it may fin ally he remarked that with tanning carried out according to the present invention the use, of any subsidiary tanning}; tub is avoided as this operation is completely c; ied out in the one vat owing to the speed and continual. movement of the tanning' liquid and of the solid matter held in suspension therein. i

/Vhat'l claim is:

1, The combination with a hide-tanning vat adapted to contain an unheated tanning; liquid'and having a perimetric wall, oi

means for maintaining a rapid and contin uous circulation of the unheated tanning liquid, a central partition extending longitudinally of the vat and terminating short of the ends thereof, and provided with an opening intermediate its length, and means for normally closing said opening, said closing means, when opened, contacting with said perimetric Wall and thereby restricting circulation of the liquid to a portion only oi? the vat.

The combination with a hide-tanning vat adapted to contain an unheated tanning liquid and'having a perimetric an, oi means for maintaining a rapid and continuuous circulation of the unheated tanning liquid, a central partition extending lonitudinally. of the vat and terminating short of the ends thereof, and provided with an opening intermediate its length, and doors hinged to said partition at one end of said opening therein and normally closed to permit circulation of the liquid throughout the entire length of the vat, said doors, when opened, contacting with said perimetric wall and thereby restricting circulation oi the liquid to a portion only of the vat.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

VITTORIO PERADOTTO. Witnesses:

GinLio Siicnnno'rr, Umnnn'ro FBANUSCUNI'.

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