Yaa Leather Printing Process

Leather Printing Process

Sikander Anwer
Department inwards Textile Engineering
University of Management & Technology, Lahore, Islamic Republic of Pakistan
Cell: 0322-4875571
Email:111811016@umt.edu.pk

Definition:
Textile printing is the procedure of applying color to cloth inwards definite patterns or designs. In properly printed fabrics the color is bonded amongst the fibre, thence equally to resist washing together with friction.

Tools:
In printing, wooden blocks, stencils, engraved plates, rollers, or silk screens tin live used to house colors on the fabric. Colorants used inwards printing incorporate dyes thickened to forbid the color from spreading past times capillary attraction beyond the limits of the pattern or design.

Leather Neutralization:
The leather to which the application of the introduce conception is peculiarly suited is 1 which preferably has no mineral common salt content together with is 1 produced using naturally occurring dyes together with tanning materials. However, the conception is applicable to leathers having a rattling low-cal mineral common salt content which advantageously does non transcend 5%. It is believed that a leather having a common salt content greater than the stated upper boundary volition live less receptive to the printing process of the instant invention, since the common salt volition resist the credence past times the leather of the ink or dye. However, it is possible to employ leathers amongst a mineral common salt content inwards excess of the 5% level.

Leather printed fabric

Coating of Leather:
The leather may live provided amongst a surface coating amongst the printing existence effected on the surface carrying said coating. The surface coating may live a water-based paint. The removal of the backing layer of the inkjet transfer sail together with of the remainder cinema is an of import footstep inwards price of restoring the surface of the leather slice to a natural texture both inwards tactile together with visual senses. As indicated supra the surfactant used for this removal footstep is conveniently 1 which is capable of removing water-based paints.

Conditions:
The duration of the heating footstep together with the temperature at which the estrus transfer occurs is dictated past times the nature together with physical characteristics of the leather slice existence printed, eg its thickness. For example, the heating footstep may concluding for a catamenia of xv seconds at a temperature of 180°C, but variations both temporally together with inwards temperature flat may live made according to the leather slice or strip existence processed. The pressing of the transfer newspaper onto the slice or strip of leather equally indicated inwards a higher house may live carried out simultaneously amongst the heating step, together with 1 lawsuit of press is that of a platen caused to contact the transfer newspaper which inwards plough is inwards contact amongst the relevant surface of the leather slice or strip.

Process:
A procedure for printing on leather includes the steps of generating a digital, monochromatic or polychromatic image, printing the ikon on inkjet transfer paper, pressing the ikon onto a leather piece, together with removing the backing layer of the transfer paper.

Accordingly, a procedure for printing on leather includes the steps of preparing an ikon of monochromatic or polychromatic character, printing the ikon using 1 or to a greater extent than inks or dyes onto a sail of transfer newspaper having a backing layer, pressing the transfer newspaper onto a slice or strip of tanned leather to transfer the said image, together with removing the backing layer of the transfer paper.

Alternative Process:
In 1 choice method, a swiping activeness may live adopted whereby pressure level is applied to a blade which traverses the backing layer together with occasions an fifty-fifty but gradual displace over the surface area of the leather.

In a farther choice method of applying pressure, a roller organisation may live used amongst a gradual displace existence afforded thereby avoiding the problems of air or wet pockets forming.

Designs are printed on leather stuff using several techniques similar estrus press, digital printing etc. We purpose multi-colors to brand the production expect attractive. The colours are of high character together with attain non fade amongst time. They are long lasting together with durable.

Steps of Leather Printing:

• The sail bearing the printed ikon is together with then pressed onto a slice of leather which has been tanned. 

• The side past times side footstep inwards the procedure involves the removal of the backing sail which may simply live stripped away either when mutual frigidness or hot. The removal of the remainder cinema left afterward stripping away the backing layer may live effected past times way of the application of a surfactant which is a textured water-based pigment remover. 

• The removal of the cinema restores the tactile together with visual characteristics of the leather, but it is advantageous to apply estrus to the leather inwards gild to refix the inks or dyes. 

• The resulting leather slice has the normal appearance together with tactile qualities of unprinted leather but carries the impress ikon generated digitally past times computer, the ikon existence fixed inwards the cloth of the leather.

Finishing:
In gild to avoid the creation of air pockets together with the possible generation of wet which mightiness adversely comport on the procedure steps, the application of the platen is effected inwards such fashion equally to secure that at that topographic point is substantially no air or wet trapped betwixt the platen together with the backing layer of the paper.

Removal of Paper:
The removal of the backing layer of the transfer newspaper by together with large leaves a residue inwards the cast of a cinema of water-based graphic symbol which tin live removed past times the purpose of a suitable surfactant.

The surfactant tends to re-hydrate the cinema which enables its removal past times unproblematic wiping. It has been constitute that a score of heating of the surfactant enhances its removal properties enabling a swifter removal of the film.

Advantages:
Advantageously the leather slice or strip carrying the ikon is estrus treated to cook the inks or dyes into the trunk of the leather piece. It is, however, to live understood that the estrus handling footstep may non ever live necessary. The estrus handling footstep may live conducted simultaneously amongst the pressing step. The ikon may conveniently live digitally generated together with stored. The transfer newspaper may live inkjet transfer newspaper obtained from a commercial source.

End Properties:
The leather slice or strip may live farther treated next the heating footstep inwards gild to restore its drib characteristics, ie its powerfulness to autumn easily from the dot of suspension, or inwards essence its pliancy. Such handling involves a physical massaging of the leather together with may live achieved past times conventional way used inwards the leather making industry.

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