Technical requirements for toilet paper spherical durability tester: ① Clamping system: capable of firmly and evenly clamping the sample between two concentric disc rings, with the surfaces of the concentric disc rings parallel to each other, and the disc rings can be driven. The clamping force should avoid sliding of the specimen during the testing process and not damage the specimen. The clamping surface should be coated with suitable plastic material, with a thickness of 1.5mm to 2mm and an IRHD (rubber hardness) of 75 ± 5. The edge of the coating should be consistent with the inner diameter of the clamping ring, with a width of at least 12.5mm. The inner diameter of the two concentric rings should be (89.O ± 0.2) mm. ② Penetration system: composed of a hard, non deformable, highly polished ball with a diameter of (16 ± 0.05) mm and a sphericity greater than 1 μ m; The sphere is fixed at the end of a hard rod (9.0 ± 1) mm long, at the center of the annular chuck, to transmit the force received to the configured pressure measurement system and force measurement system. ③ Force measurement system: Using a force measurement system of level 1 or above to measure the load, it can display and record the strong force at the time of rupture. ④ Drive device: composed of a static single axis testing equipment with a device that can reciprocate up and down at a certain speed, and its direction of motion is perpendicular to the specimen under force in the chuck. The penetration rate of the specimen should be (125 ± 5) mm/min.