Testing of flexible polyurethane foam with recycled adhesive

1 Scope This standard specifies the test method for determining the thickness loss and hardness loss of fatigue properties of soft foam polymer materials. This standard test method is used to evaluate the performance of polyurethane and latex soft foam polymer materials whose final use is load bearing pad. The thickness loss and hardness loss obtained from the experiment are interrelated with the actual situation in use, but they may not be completely consistent. This test method is applicable to both standard size specimens cut from block materials and molded specimens with multiple shapes. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GBT 10807-1989 Soft foam polymer material indentation hardness test method 3 The principle is to repeatedly compress the sample with an indenter that is smaller than the sample area, and the load of the sample in each cycle reaches the maximum indentation load limit value. 4 instrument soft bubble repeated compression fatigue testing machine, including the following parts. 4.1 Support plate The support plate can fully support the specimen, with an area larger than the specimen. There are holes with a diameter of 6mm and a spacing of 20mm on the plate, so that air can be discharged from below the specimen. 4.2 The diameter of the pressure head is (250 ± 1) mm, and there is a chamfer of (2511) mm at the bottom edge. The maximum load provided by this device during each compression cycle can reach (750+20) N. The pressure head should be fastened to the guide device, with a smooth surface but not polished. Use a crank or other suitable mechanical device to enable the indenter and specimen to move relative at a frequency of (70+5) times/min between the specimen bearing plate and the indenter support, and the amplitude of the movement should be adjustable. When the support and support plate are closest in the 4.3 pressure head support test, the entire weight of the pressure head is borne by the sample, and in addition, the weight of the pressure head is borne by the support. The pressure head should be able to hang empty on the support frame to prevent overloading of the specimen. A method should be provided to control the time of full load applied by the pressure head during each cycle. This time cannot exceed 25% of the duration of each cycle. 4.4 Load measuring device is used to measure the load applied to the specimen by the indenter. Installing a load sensor under the support plate is a suitable method. Note: When manually adjusting, the indenter is attached to the lower end of the shaft, which is supported by a limit device perpendicular to and above the support plate to support the specimen. During each cycle, when the entire weight of the indenter is supported by the specimen, the vertical position of the indenter relative to the support plate is adjusted to control the time for the full load applied by the indenter. Figure 1 is a schematic diagram of the manual adjustment device. Figure 2 is a schematic diagram of the automatic adjustment device. With this device, the loading time of the sample at full load is directly controlled by time during each cycle

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