Bonnell Spring manufacturing Equipments (Pocket Spring manufacturing Equipment)
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Mattress examination machinery C00044
The Cornell Type Tester has been designed and manufactured with relevance to testing and evaluating of Innerspring and Boxspring mattresses.
There are several different methods used for the evaluation of innersprings and boxsprings, testing for measurements regarding firmness, firmness retention, durability, effect of impact etc.
The Cornell Type Tester is used to test the long term capacity of bedding to resist cyclic loading. The machine consists of a double hemispherical ram head on a manually adjustable shaft. A load cell is located at the ram head to measure the force being applied to the bedding.
The shaft is connected to an adjustable eccentric which is rotated by an electric motor at up to 160 cycles per minute.
The bedding is located below the ram, and the eccentric and shaft position adjusted so that the maximum load of 1025N and the minimum load of 22N is applied when the eccentric is rotated to the lowest and highest positions respectively. A position transducer (wire activated potentiometer) is located so the position of the ram head can be measured automatically when the manual adjustments are complete. A static scale is manually adjusted to zero when the ram head measures 22N load.
The eccentric is then rotated slowly, raising and lowering the ram head so that the load/position data can be recorded for a few cycles. The mattress firmness is calculated from the load readings at 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.
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. The static scale is then reset to zero, and the equipment adjustment procedure repeated.
An operator prompting computer program measures both the load and ram head position from the two transducers throughout the total test stage and produces a full test report upon completion.
Packed Dimensions: 145cm x 290cm x 98cm @ 790kg