Testing Machines, Inc.

Testing Machines, Inc.

40 McCullough Drive, New Castle, DE 19720 USA

Internal Bond Tester and Prep Station

Internal Bond Tester and Prep Station


The Internal Bond™ Tester is designed to determine the internal bond strength of a variety of Paper and Board materials according to TAPPI T 569 and ISO 16260. The instrument design is based on a falling pendulum which creates a high speed impact on a paper specimen. The paper specimen is sandwiched between two double-coated tape substrates. The pendulum impact measures the total energy required to delaminate the internal fibers of a specimen in a “Z” type direction into two plies.

An automatic sample preparation station

(Model 80-30) is available which allows five specimens to be accurately pressed and cut simultaneously. The prep station includes a safety enclosure over the cutting blades, eliminating the use of box cutting knives to separate the individual test specimens.


  • 7” inch full-color digital touchscreen display

  • Storage and editing of up to 100 readings including average and standard deviation

  • Selectable units (ft.lb/in², J/m² and kg•cm)

  • Easy-to-use one button operation for clamping anvil and starting test

  • Report printout with built-in printer

  • Magnetic hammer release

  • Automatic calibration

  • Ability to create, edit and save test procedures

  • Automatic specimen hold-down during test sequence

  • RS-232 serial output

  • Universal power supply for 110V / 220V operations

  • Automatic pendulum brake after test (optional)

  • Calibration block set for verifying calibration (optional)

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