US1321730A - Felice gilardini - Google Patents

Description

FrGILARDINI.

TANNING LEATHER FOR BELTS.

APPLICATION FILED MAY 21.1918.

Patented Nov. 11, 1919.

FELIGE GILARDINI, OF T'UBIN, ITALY.

TANNING LEATHER FOR BELTS.

Specification of Letters Patent.

Patented Nov. 11, 1919.

Application filed May 21, 1918. Serial No. 235,879.

To all whom it may concern:

Be it known that I, FELICE GILARDINI, a subject of the King of Italy, of 5 via Giannone, Turin, in the Kingdom of Italy, have invented certain new and useful Improvements in Tanning Leather for Belts; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention has for its object certain new and useful improvements in the process for tanning leather for belts forming the object of my patent application filed April 6, 1918, Serial No. 227,051, (when the tanning apparatus forming the object of my patent application filed April 6, 1918, Serial No. 227,050, is not used), by which a great economy is obtained.

According to the process described in my said patent application, it was necessary to use a great number of grates, as each skin had to be pressed between a pair ofgrates during the whole tanning process and the following operations. This was necessary in order to prevent the tan liquor acting on the compressed skin sections, which, if not suitably protected, would become swollen after soaking.

According to this improved process, the grates are dispensed with, as I found how to prevent any action of the tan liquor on the compressed unprepared sections, without using any protecting means.

Said improvements consist in placing the perfectly stretched skins between two dies of a press, preferably a hydraulic press, provided with a plurality of openings (as the grates employed in the process forming the object of my patent application Serial No. 227,050), the form and size of which correspond to the skin sections to be treated. The dies are heated and pressed strongly upon the hide or skin while this latter is stretched until the compressed sections are reduced to a thin and exceedingly compact sheet; the

hide is then removed from the press and placed into the tanning pit free from any protecting means. The tan llquor, as the practice has demonstrated, has no effect on the compressed sections, while it penetrates the not compressed ones. This im ortant result is obtained owing to the fact t at the pressure is elfected under heating, so that the compressed hide sections are thoroughly drled. A still better result may be obtained by spreading on the press dies an adhesive or impermeable substance, which, during the pressingoperation, effected under heating or not, penetrates the superficial layer of the compressed skin, so that this latter will not be affected at all during the tanning operat1on.

An important economical advantage may be obtained in this process, even without any heating operation, by using thin metal plates provided with openings corresponding to the skin sections to be treated. In this case, the skin is first strongly pressed between the press dies in order to compress to the highest degree the hide sections not to be treated; then the dies are removed and a thin metal plate, for instance a copper plate, is applied to each side of the skin, which latter, thus coated, is again pressed between the dies and then brought into the tanning pits.

A further modified form of this belting tanning process consists in constructing the said grates of a particular type of electrically heating them, in order to maintain the compressed sections of the skin at a certain temperature even during the tanningbath. The grates, provided for the purpose of maintaining the heat on the compressed skin sections, will also heat the tanning solution acting on the sections to be treated.

In the annexed drawings is shown, by Way of example, a constructional form of the special grates and metallic protecting plates above described.

Figure l is a cross section of a grate pair of the type used according to the process of my patent application filed 1918.

Fig. 2 is a plan thereof.

Fig. 3 is a section of the hide provided with the protecting copper plates and ready for the tanning bath.

, Figs. 4 and 5 are an external view and a cross section respectively, of an electrically heated grate pair inclosing the hide.

As it appears from Fig. 3 of the drawing, the pair of thin copper plates 1, provided with openings corresponding to the sections? to be tanned, are stroi'igly pressed on the compressedsections 2, by means of the press as above described. If necessary, the plates will be provided with small points I to secure them on the hide.

The electrically heated grates illustrated in Figs. and are in their outer form similar to the ordinary grates described in my patent application filed April 6, 1918, Serial No. 227,050, and illustrated in Figs. 1

- and 2 and are'provided with bolts 4:, which :-'are tightened whilethe hide is stretched, be-

fore carrying it. under the press and then further tightened while the greatest pressure is produced by'means of the press.

Each of said rates is rovided with a 'tube pair 5, projectingjfrom' the tan liquor surface in the pits, through which the wires of the electric current are caused to pass.

From said Figs. 4: and 5 it is evident how the windings producing the heating of the plates through electric resistance are arranged.

Evidently the electric heating could be produced by any other known means. The tan liquor acts on the'sections'3 to be treated through the holes 6 of the grates. Owing ments, and subjecting the hide to a tan ning solution.

' 2. The method of manufacturing leather which comprises compressing and heating the unprepared hide in spots, removing the pressure therefrom, and subjecting the hide to a tanning solution.

3. The method of manufacturing leather which comprises stretching the unprepared hide, pressing and heating the stretched hide in spots, and tanning the hide.

4:. The method of manufacturing leather which comprises stretching the unprepared hide, pressing and heatin the stretched hide in spots, and tanning the unpressed and un heated portions of the hide.

5. The method of manufacturing leather which comprises applying under pressure, an impermeable substance in spots to the unprepared hide, heating the spots, and tanning the untreated portions of the hide.

6. The method of manufacturing leather which comprises applying to parts of the unprepared hide, a coating insoluble in a tanning solution, subjecting the coated parts to pressure, and subjecting the hide to a tanning solution.

7. The method of manufacturing leather which comprises applying to parts of the unprepared hide a coating insoluble in a tanning solution, subjecting the coated parts to heat and pressure, and subjecting the hide to a tanning solution.

8. The method of manufacturing leather which comprises applying an adhesive to the unprepared hide in spots, heating and pressing the adhesive onto the hide, and subjecting the hide to a tanning solution.

In testimony that I claim the foregoing as my invention, I have signed my name.

FELICE GILARDIN I Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C.

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