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PaperSchmidt- Paper Roll Hardness

PaperSchmidt in use test paper roll hardnessDesigned specifically for the paper industry to cut costs and increase winding machine efficiency.

The need for roll testing

Irregular rolls and other defects such as corrugations and telescoping are caused by non-uniform paper roll hardness profiles are a major cause of lost production for both producers and converters alike. A reliable measurement of the roll hardness profile is of critical importance in deciding whether a roll is good or bad. Production staff needs to be able to test quickly and reliably and to interpret the results as efficiently as possible. This typer of testing can be done on all types of rolled materials such as paper, films, and foil.


PaperSchmidt is the first rebound test hammer designed specifically for roll hardness testing. A new hardness test measuring principle and a high compliance plunger provide roll-profiling accuracy and repeatability that was unachievable before now. In addition to this it 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 profile a simple matter.

Benefits to the customer

Accurate Profiling: Sensitivity and repeatability to a degree unmatched by conventional roll testers. Dedicated firmware allows instant analysis of the data on the instrument’s display.

Durability: The PaperSchmidt has a vastly improved service lifetime compared with traditional instruments.

Ease of use: Intuitive operator interface (displaying hardness, profiles, limits, roll IDs, etc.). Automatic reloading and automatic data storage allows the fastest possible test performance.

Data export and analysis: The Paperlink software provides simple tools to make a clear assessment of the results.

Exceptional Roll Profile Accuracy

The PaperSchmidt’s unique design combines the simplicity of the test hammer method with accuracy that was previously only achievable with much more expensive instruments. As illustrated in the picture to the right, the PaperSchmidt provides a lot of useful information about the roll profile. Additional statistics are also possible.

The following graphics show comparison tests made with the PaperSchmidt, a classical Schmidt hammer and the Parotester. Repeatability has also traditionally been an issue in the paper industry. Again the PaperSchmidt excels in this. A roll with a soft edge was tested using the three different roll profile test devices based on rebound. The step interval was 2 cm, subsequent scans were spaced 4 cm. Five passes were done with each instrument. Each test series was done in a new data acquisition file. The results of the single passes and the average are plotted. The PaperSchmidt clearly excels in sensitivity, specificity and repeatability.

Paperlink - Data Analysis Made Simple

The Windows based software Paperlink, developed by Proceq SA, makes it possible to download, present and edit data measured by the PaperSchmidt in a fast and easy way using a PC. This allows the user to quickly check the roll profile against user defined tolerances. It also allows the user to define roll identifier names for batch testing and download these onto the hammer. All data can be exported to third party applications.

Paperlink software showing paper roll hardness measurements

System requirements:

  • Windows XP, Windows Vista, USB-Connector
  • An internet connection is necessary for software and firmware updates  when available.

The PaperSchmidt consists of:

  • The PaperSchmidt
  • battery charger with USB-cable
  • CD with Paperlink software
  • carrying strap
  • documentation
  • carrying bag

Technical Information PaperSchmidt

 Mechanical Data

 Impact energy  0.735 Nm
 Hammer Mass  135g
 Spring Constant  0.262 N/mm
 Spring Extension  75mm
 Dimensions of Housing  55x 54x 245mm ( 330m to tip of plunger)
 Dimensions of Tip  94 x 15mm dia
 Weight  648g

 Memory Data

 No of Series Names  50 Series names (up to 12 characters)
 Memory Capacity  Dependent on Series length (eg 428 series with 10 values per series)

 Electrical Data

 Display  17 x 71 pixel graphic
 Power Consumption  ~13mA measuring, ~4mA set up and review, ~0.02mA idle
 Accumulator Duty  >5000 impacts between charges
 Charger Connection  USB Type B (5V, 100mA)
 Accumulator Capacity  ~150mAh

 Environmental Conditions

 Operating Temperature  0 to 50 deg C
 Storage Temperature  -10 to 70 deg C

 Standards Applied

 TAPPI T 834 om-07 (2007)




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