3 parameters needed to be tested on a range of toothbrushes:
- Stiffness of bristles according to ISO 8627, 1987/BS5757
- Strength of a single bristle
- Strength of a tuft of bristles
The equipment needed to be simple to operate for production staff, robust enough for a factory environment with extremes in temperature and offer the ability to perform all 3 tests with the minimum of 'set-up' time.
A VersaTest motorised test stand adapted with accessories and sensors was used to perform
According to the ISO 8627 bristle stiffness test, the toothbrush has to be mounted in a holder and rubbed against a metal grid at a speed of 200 mm/min. The grid is attached directly to a 100N S-Beam Loadcell which detects the stiffness of the bristles as they travel over it's surface. The graph of force/deflection was recorded using DataPlot-X software. Soft bristles will show a low force compared to hard bristles.
A surgical clamp with serrated jaws was used to hold the bristle for the 'single bristle' pull test. Forces in the region of 10-15N were required to remove the nylon bristle from the polypropylene
For the 'tuft' pull test, a set of bristles were held in a pin-chuck and connected to a 200N S-Beam sensor, via a flexible chain link. Removal forces for the complete tuft were in the region of 50 - 70N.
- VersaTest Motorised Test Stand with Height Scale
- 100N and 200N Smart S-Beam
- Pin Chuck and Chain
- X-Y Table c/w Toothbrush Head Holder for above tests.
- Bristle Stiffness Fixture
- 2 AFTI displays
- Surgical Clamp and Chain
- DataPlot-X Software
- DigiCon Interface and Cables
Westone Products, UK & China