Disposables Consultancy Service Copyright © 1999 [DCS]. All rights reserved. Revised: October 2013

DCS Home Page

The Hardy Integrity Tester:

An electro-mechanical device for the repetitive raising and dropping of disposable absorbent products in front of a light box in order to quantify the breaking strength of the absorbent core within the outer envelope and to observe the mode and position of breakage.

The product can be tested in a dry condition or with a specific targeted insult so that the dry and wet strengths of the product can be determined at different stages of saturation.

A reliable and consistent test device for the determination of a pad strength parameter in absorbent products such as diapers, underpads, shaped pads or sanitary napkins.

The device can be fitted with a fixed or variable speed motor. Our standard operating speed is 60 drops per minute. The electrical cabinet has a counter, a motor speed console, a setting indicator and an emergency stop button.

A remote Stop/Start hand operated console is provided so that the device Operator can stop and start the unit while still observing the test piece at the front of the unit.

Pad Integrity Test


The ability of the absorbent core of a disposable product to remain intact before and after absorption of fluids despite the dynamic impact from the wearer is an important performance parameter of the product.

Our HIT device is the only tester available on the market that reliably and consistently evaluates the strength of the absorbent core within the product envelope. This new device and test method finally provides a reliable means of evaluating the core integrity.


Device Function

All longitudinal elastics are cut from the absorbent product (if present).
The trial products are placed in the clamps thus suspending them in front of the light box
The height of drop is set at the required level (0 to 80mm).

The light box is switched on.

The motor is switched on and the product is repetitively dropped from the set height until a complete crack is observed across the core.




Typical Test Results

The above test results were achieved for two very different baby diaper cores. The blue curve was a diaper without a carrier material, the red curve was a diaper with top and bottom tissue glued to the core.
The Diaper break-up curve is created from the average values for a set of samples. A characteristic curve is produced for a specific insult quantity.

The scatter chart above shows the HIT results for the diaper Sample B. Each point on the graph is a test result for a sample diaper. The X axis is the drop height and the y axis is the number of times the diaper was dropped before a full failure crack appeared in the core. This general funnel shape is typical of all HIT results; the test results being more closely grouped as the drop height increases. The narrower the funnel shape,the more consistent is the drum forming operation.

The daily or weekly drop height graph will give indications of two quality parameters:
  • Consistency of the pad formation. Any cassette (mould) defects can be quickly identified. Improved consistency of pad formation will be reflected by a narrowing of the range of results.
  • Improvement in the pad integrity: A rise in the average line (red line above) indicates general improvement of the pad integrity of the product.

Contact us at Disposables Consultancy Service if you would like to receive more information. A video of the test and device is available on request. Please contact us if you require a price for this equipment.

Disposables Consultancy Service
Copyright © 1999  [DCS]. All rights reserved.
Revised: October 2013

Home - FAQ's - Contact