Toothbrush tester for bristle stiffness and pull-out resistance
- Motorised tensile test stand
- Custom grips to suit the each individual test requirement
- Graphing software
- Single testing station for multiple tests
- Soft, medium, firm grading quantified
- Data capture and results comparable to international test standards
- System usable by production staff in the factory environment with maximum reproducibility
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 each test.
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 100 N S-Beam Loadcell which detects the stiffness of the bristles as they travel over its 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 10-15 N were required to remove the nylon bristle from the polypropylene toothbrush head.
For the 'tuft' pull test, a set of bristles were held in a pin-chuck and connected to a 200 N S-Beam sensor, via a flexible chain link. Removal forces for the complete tuft were in the region of 50-70 N.
- VersaTest Motorised Test Stand with Height Scale
- 100 N and 200 N 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