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Duplex printing simulates a woven pattern by printing the fabric on both sides. Most duplex prints are produced on direct roller print equipment, some are produced on rotary screen printers. Most often they are made to imitate more costly woven yarn dyed design effects such as stripes, checks, and plaids.
Method:
A vertical arrangement of the rolls is required and the fabric feeds between two parallel set of rollers. A design is printed, simultaneously on both sides of the fabrics. Duplex printing produces an equally clear outline on both sides of the fabric. The design is applied so skilfully by careful registration of the printing cylinders. For some time the design on either side was a duplicate of the other side. Recently, printing companies have made prints with different designs on each of the two sides. The pattern and colour may be quite distinctly different. Such fabrics may resemble yarn-dyed or fibre dyed fabrics.
The development of the vertical rotary, screen printing has made it possible to do a type of duplicate printing using screens. These fabrics are also identical on both the sides or have different print designs and colours on the two sides.
Merits and demerits:
Duplex prints are rarely used now a days, because of the high cost of producing these prints nearly equals the cost of producing these prints nearly equals the cost of the superior woven jacquard and dobby designs.
Identification:
Duplex prints may simulate coloration usually achieved by dyeing yarns, but inspection of yarns clearly shows the fabric to be duplex print because the yarns in duplex prints have surface spots of colour, but the yarns which are yarn dyed or cross dyed have a solid colour throughout.
Yarns of a woven design fabric will have a single colour, while yarns from a printed fabric will have more than one colour at pattern design area.
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