MEBLE Fair 2008
On 28-31 May 2008 MEBLE Fair was held on the premises of Poznan International Fair.
This year the Wood Technology Institute was invited as a sub-exhibitor to the stall of the Polish Chamber of Commerce of Furniture Manufacturers where the Institute presented an innovative device for furniture mattresses testing
The original structure was produced within the framework of a multi-year project carried out by the Wood Technology Institute in Poznan and Institute for Sustainable Technologies in Radom. The uniqueness of this device consists in the fact that it is a multi-functional device allowing for carrying out a few tests during one placing of a piece of furniture in the working station. Till now such solution has not been used in other furniture testing laboratories.
The innovation nature of the solutions used in this device allowed for meeting the standard's requirement for perfectly sinusoidal movement of the heavy roller, i.e. one of the two components of this device which simulates movement of a person weighing around 140 kg, during weighing down the tested mattress in combination with rolling.
In the new installation the movement is perfectly sinusoidal because it is done by an eccentric connecting rod which moves forward with an accelerated movement and then slows down striving at reaching extremum and comes back with an accelerated movement again. The hardness meter installed in this device registers load as well as deformation of the tested surface and it works with a very high precision - point zero is assumed at the level of 10 N - the level used in the highest class of this type of devices.
An innovative solution is also the use of gyroscope as it helps keep the roller in a perfectly horizontal position during work. During rolling of the mattress it gets deformed, i.e. a loss of the thickness of upholsterer's foam appears. In the initial phase of a test the roller is perfectly horizontal, according to the standard, whereas at the end of the test due to dents and deformations the position of the roller is changed. Thanks to the use of gyroscope in the form of an arm monitoring the height of the mattress, the roller adjusts to current dynamic height of the tested mattress. It is important because from the point of view of mechanics and calculation theory in the case of no level correction an acute angle is created between the roller movement axis and connecting rod which propels it. This causes „squeezing down" of the tested surface when the roller moves forward and additional reducing of load when it moves backwards.
The quality of the new furniture mattresses testing device consists above all in the fact that it was designed and built directly by specialists dealing with furniture testing and this guarantees its practical use