PRINTING Prepared By : Mazadul Hasan sheshir ID: 2010000400008 13th Batch (session 2009-2013) Department : Wet Processing Technology Email: mazadulhasan@yahoo.com Blog : www. Textilelab.blogspot.com (visit) Southeast University Department Of Textile Engineering I/A 251,252 Tejgaon Dhaka Bangladesh Prepared By : ©right PRINTING The printing is described as localized dyeng, dyes or pigment are applied locally or discontinuously to produce the various designs. Printing is the production of all active designs with well defined boundaries made by the artistic arrangement of a motif is one or more colors. Printing is a process for reproducing text and image, typically with ink on paper using a printing press. It is often carried out as a large- scale industrial process, and is an essential part of publishing and transaction printing. Screen printing is a printing technique that uses a woven mesh to support an ink-blocking stencil. The attached stencil forms open areas of mesh that transfer ink as a sharp-edged image onto a substrate. A roller or squeegee is moved across the screen stencil, forcing or pumping ink past the threads of the woven mesh in the open areas. Screen printing is also a stencil method of print making in which a design is imposed on a screen of silk or other fine mesh, with blank areas coated with an impermeable substance, and ink is forced through the mesh onto the printing surface. It is also known as silk screening or serigraphy. printing 1. used to add color to localized areas only 2. allows for greater design flexibility and relatively inexpensive patterned fabric 3. wet prints use a thick, liquid paste 4. dry prints use a powder 5. foam prints use a colorant dispersed in foam PRINTING printing methods digital printing— • ink-jet printing heat-transfer printing • design transferred to fabric from specially printed paper by heat & pressure electrostatic printing • prepared screen covered with powdered dye; passes through electric field & pulled onto material foil printing • adhesive applied to fabric, foil heated on heat transfer press & bonds to adhesive pattern stencil printing • separate pattern cut for each color, color is applied in thick paste or sprayed on with air gun There are three methods of pattern dyeing and printing: Direct printing Resist printing Discharge printing What type of printing method you know? Direct Printing: In direct printing a design is etched into a copper roller. A dye that has been thickened into a paste with starch, gelatin, or synthetic polymers is applied to the etched area while the un-etched surface is kept clean. The color design is transferred to the cloth under pressure. Direct printing may also involve forcing the paste onto the fabric through a screen, a technique similar to stencil printing except that the screen controls how much paste is applied to the cloth. Resist Printing: In resist printing a reverse-printing method, a dye repelling substance is selectively applied to the cloth, which is then placed in a dye bath. This method is used for example, to produce white polka dots on a color background. Discharge Printing: In discharge printing, the whole fabric is dyed. A pattern is then printed on the fabric with a chemical that oxidizes or reduces the dye, creating a white pattern on a colored background. What type of printing method you know? Allover print. Screen print. Reactive print. Print with plastisol dye-stuffs. Pigment print Flock print Foil print Lurex print Embossed print Heat transfer print Hi-density print Dip-dye print. All others of printings are Factors Affecting Cost of Printing 1. Size of printing 2. Number of color of printing 3. Any grading of size of printing from size to size 4. Any restriction/selection of use of dyes and chemicals 5. Lab test requirement 6. Wash sustainability 7. Tolerance in placement of print art-work 8. Tolerance in color shade variation 9. Place of printing 10. Type of printing Preparation of the fabric to be printed. Preparation of the print paste. Making an impression of the print paste on the fabric. Drying of the printed fabric. Steaming of the printed fabric. After treatments (soaping etc) Steps of printing:- [...].. .Printing process :- Sychrop print\ hand print ↓ Dryer (temp 170 – 172) ↓ Quality inspection ↓ Sewing Steps of printing section :- Design ↓ Expose ↓ Color ↓ Develop sample Process of after Production Primary Printing Inspection :- Approval ↓ Strike of Approval ↓ Hand over (Measurement Chart) ↓ Pre-production meting ↓ Quality Report ↓ Total Production Summary Roller / Rotary Printing This... into the surface of copper rollers; by varying the depth of the engraving on the roller the shade depth can be altered Sharpness of line and fine detail can be achieved this way A typical printing machine has a large padded drum or cylinder, which is surrounded by a series of copper rollers, each with its own dye trough and doctor blade that scrapes away excess dye Schematic diagram of PRINTING The tubular... (Silk) Screen Printing Rotary Screen Printing Block Printing Heat Transfer Printing Dye Sublimation Printing Resist Printing Exposing m/c Curing m/c Heat transfer m/c Design: - printing design means colors separate to the design Printing size , grading system , measurement then design pass to the expose section Expose :-Design pass to the screen heat transfer to the expose machine , screen is the... screen and a printing blanket (a continuous rubber belt) It picks up colour from the engraved area of each roller in sequence The printed cloth is dried immediately and conveyed to an oven that sets the dye Knitted fabric is mostly printed in this method as it does not pull or stretch the fabric Print Techniques Roller Printing Flat (Silk) Screen Printing Rotary Screen Printing Block Printing. .. engraved roller, and the fabric is guided between it and a central cylinder The pressure of the roller and central cylinder forces the print paste into the fabric Because of the high quality it can achieve, roller printing is the most appealing method of printing designer and fashion apparel fabrics Long runs of the same fabric design are produced on a roller print cylinder machine operating at speeds... passage of air and release of excess print paste Fabric is stretched over a printing table and fastened with small pins Printing starts from left to right, first the colour is evened out in the tray and then the block is dipped in Then the block is applied to the fabric with careful registration and pressure is applied Dye Sublimination Printing Dye sublimation allows photo lab quality picture printing. .. Hand Print :- Automatic Print Hand Print 1 Accuracy 1 No Accuracy 2 Limited Production 2 No Limited Production 3 Production is high 3 Production is Low 4 Depends on m/c capacity 4 It is manually print 5 Capacity is 9 colors 5 Variety colors print Rotary Screen Printing Process Block Printing Block printing is a traditional process dating back to India in the 12th century Wooden blocks made of seasoned... Machine adopts many rows of powerful homogeneous distribution UV light source, economic and save energy The Imported sealed rubber blanket Filtered Air Regulator Heat &+ Keep Dust clean Steps in design to screen:Screen mode (5 0-6 0 min dryer temp 70 c) ↓ Exposing m\c ↓ Cold water (5 min) ↓ After them spray gun develop ↓ Dryer (3 0-4 0 min) ↓ Re-wash ↓ Dryer (20 min) ↓ Re-expose (20 min) ↓ Hard &... gentle gradation of colour and does not distort or fade over time Heat Transfer Printing This is essentially transferring an image to fabric from a paper carrier When heat and pressure are applied to this paper the inks are transferred Some transfers are topical, and the image sits on the surface of the fabric Other transfers are absorbed into the fibres of the fabric Heat transfer printing is clean... been dipped into the dye bath The amount of time it is left in the bath determines the hue of the colour (longer for deeper colours) Direct Print Also called application print Design is printed directly onto a white cloth or a previously dyed fabric They are the most popular print types Discharge Print Fabrics are dyed a solid color prior to printing When printing is done, the design is applied by . print Hi-density print Dip-dye print. All others of printings are Factors Affecting Cost of Printing 1. Size of printing 2. Number of color of printing 3. Any grading of size of printing. are three methods of pattern dyeing and printing: Direct printing Resist printing Discharge printing What type of printing method you know? Direct Printing: In direct printing a design. foam PRINTING printing methods digital printing • ink-jet printing heat-transfer printing • design transferred to fabric from specially printed paper by heat & pressure electrostatic printing • prepared