DM120 1st Edition Lecture 15 Outline of Last Lecture I Textile Dyeing Outline of Current Lecture II Textile printing A Methods of printing III Basic types of prints IV Special types of prints V Color feature Current Lecture Printing dyeing in a localized patterned area Print Paste thickened dyes or pigments used for printing Methods of Printing 1 Screen Printing move squeegee over screen print paste forced through mesh areas of printing screen by squeegee 1 Hand screen 2 Automatic screen 3 Rotary screen A Hand screen printing used by ancient cultures still used today for small limited quantity high fashion print T shirts use plastisol ink stretchable and durable can t be ironed or dry cleaned B Automatic screen printing flatbed printing fabric is moved to the screens on a wide rubberized belt C Rotary screen printing fabric is moved on a wide rubber belt under continually in motion rotary screen cylinders Efficient mass production most widely used printing method 2 Roller printing high speed process in which design transferred to a fabric by copper engraved roller Setting the color aging wet prints when a dye is used exposing dye printed fabric to a boiling steam followed by rinses and drying Curing when pigment is used fabric subjected to dry heat resin in the pigment used for dry prints pigment is not as good as dyestuff These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 3 Heat transfer printing thermal transfer design printed on transfer paper then pressed to fabric at 400 degrees F usually use acetate acrylics nylon polyester usually don t use fake fabrics 4 Digital printing used for office printing on paper recently being used for textiles Basic Types of Prints 1 Direct prints designs printed directly on white cloth to recognize direct print background is white lighter shade on the front of the fabric than the face Overprint design printed over previously dyed 2 Discharge prints fabric is piece dyed a solid color then the fabric design is printed onto the fabric using a bleaching agent Discharge prints are the same shade on the face and back of the fabric Print is white or a different color or shade than the background Traces of original background color on print 3 Resist prints pattern is printed on white fabric with a chemical or wax resin then fabric is piece dyed to obtain background color same results as discharge prints methods are reverse of discharge printing craft or hand printing rather than a production basis Special Types of Prints Blotch prints background color created by printing not piece dyeing compared w resist print by piece dyeing Flock prints tiny particles of fiber flock adhered to fabric in a design fibers upright upon adherence Color Feature 1 Color fastness how long color will last 2 Wet on dry wet on wet Wet on dry second color is printed on top of a previously printed color when the first color is dry Wet on wet second color is printed directly over a first color that is still wet Fall on third color from the two printed colors become mixed