Scuff Tester (Patra Rub Proofness Tester) This is an equipment to evaluate the Print Quality / Rub proofness of prints on a substrate. Good Print Quality is a perfect combination of Good Ink + Good Paper + Good Process + Good Drying. If any of the above factors go wrong, the result can be disastrous. The most commonly used method to evaluate print quality is by rubbing 2 printed surfaces against each other. However if this is done manually, the amount of pressure applied during rubbing cannot be quantified and kept constant. Moreover it is difficult to keep the plane of contact constant and keep a track of the number of rubs. Hence making this method highly Operator Dependent. The Patra Rub Tester (Scuff Tester) overcomes this by rubbing 2 printed surfaces against each other (face-to-face) in the same plane, at the same speed (60 RPM), under a constant rubbing pressure of 2 psi. This equipment can also be used to evaluate color transfer from printed / coated surfaces during rubbing. This equipment confirms to international specifications of PATRA / PIRA / BS - 3110. The test is simple and rapid to execute, but it must be recognized that it is subject to serious errors if instrument, diaphragm, and gages are not properly maintained or if improper procedures are used Models available : Various digital models with non-contact type rub counters, Auto-stop facilities, Speed Indicators, etc. This equipment is relevant to : Printing / Processing houses. Heavy End-Users of printed paper, cartons, etc. Ink Manufacturers Research Institutions. Packaging Development centers.