The Cornell Type Tester has been designed and manufactured for testing and evaluating of Innerspring and Boxspring mattresses.
The Cornell Type Tester test the long term capacity of bedding to resist cyclic loading. There are several different methods evaluate the quality of innersprings and boxsprings. Such as testing for measurements regarding firmness, firmness retention, durability, effect of impact etc. Our Cornell type Tester is trusted by leading mattress brands. For Instance, Sealy.
The machine consists of a double hemispherical ram head on a manually adjustable shaft. A load cell on the ram head measures the force being applied to the mattress. The shaft is connected to an adjustable eccentric which is rotated by an electric motor at up to 160 cycles per minute, variable.
The testing method starts by placing the mattress below the ram. Then, adjusting eccentric and shaft position. So that the specific load is possible to apply. That is maximum load of 1025N and the minimum load of 22N. This is when the eccentric rotates to the lowest and highest positions respectively. The machine measures the psoition of ram head automatically. This is with the help of position transducer.
Then, eccentric rotates slowly, raising and lowering the ram head. Thus, recording load or position data for a few cycles. The firmness of mattress is measured from the load readings. Which is between 75mm and 100mm respectively. This procedure is performed at the start of the test and the subsequently at the end of each of seven stages. These stages are reached when 200, 6,000, 12,500, 25,000, 50,000, 75,000 and 100,000 cycles have been completed at 160 cycles per minute. The duration of the cyclic testing will take nearly 10.5 hours, simulating 10 years of mattress use.
At the end of each stage, the position of the ram head is noted when a load of 22N is applied to the mattress. A change from the previous static reading is referred to as a dimple and this is recorded. An operator prompting computer program measures both the load and ram head position from the two transducers throughout the total test stages and produces a full test report upon completion.