Paper Roll Hardness Tester – PaperSchmidt
Roll Profile – PaperSchmidt

The PaperSchmidt is the first rebound hammer designed specifically for the testing of the roll profile. Extensive field tests carried out at major manufacturers and converters in the US and Europe have consistently shown that it provides previously unachievable accuracy and repeatability of the roll profile.

The instrument is fully compliant with the TAPPI T834 om-07 standard used in North America to regulate the test of the paper roll profile and it delivers instantly all of the key parameters required for assessing the quality the of paper roll. In addition to this the PaperSchmidt has an extended lifetime to cope with the heavy demands of the paper industry and dedicated tools, such as pre-defined tolerances that make assessing a roll profile a simple matter. 

The PaperSchmidt meets the customers' needs for a quick and reliable test of the roll profile.

  • It has a high compliance plunger and a revolutionary measurement principle that is independent of the angle of impact. This gives the PaperSchmidt its “Best in Class” performance for the test of the roll profile
  • The paper roll profile can be viewed directly on the integrated display.
  • The instrument provides an automatic calculation of the average paper roll hardness, the range and standard deviation.
  • It can also be programmed to indicate immediately if pre-set max/min values of the roll profile are exceeded.
    • TAPPI T834
    Technical Data
    Technical Data 
    Impact Energy0.735 Nm
    Hammer mass135 g
    Spring constant0.262 N/mm
    Spring extension75 mm
    Dimensions of housing55 x 55 x 250 mm (2.16” x 2.16” x 9.84”), 340 mm (13’’) hasta la punta del punzón
    Dimensions (plunger visible part)94 x ø15 mm (3.7” l. x 0.59” diam.),  el radio de la punta esférica es de 25 mm (0.98”)
    Weight570 g
    Memory Data
    No. of series names50 series names. Each name can be up to 12 characters long.
    Memory capacityDependent on length of test series
    Example 1 - 428 series with 10 values per series
    Example 2 - 257 series with 20 values per series
    Electrical Data
    Display17 x 71 pixeles, graphic
    Power consumption~13 mA measuring, ~4 mA set-up and review, ~0.02 mA idle
    Accumulator duty>5000 impacts between charge
    Charger connectionUSB type B (5 V, 100 mA)
    Accumulator capacity~150 mAh
    Environmental conditions
    Operating temperature0 to 50 °C (32 to 122 °F)
    Storage temperature-10 to 70 °C (14 to 158 °F)


    • Standard 2-year limited warranty on electronic parts of the concrete test hammer
    • Optional extended warranty periods up to 3 additional years
    More Information

    Please contact Proceq for more information on the testing of the roll profile with the PaperSchmidt.