The most important factor to influence mattress’ comfortable、healthy、moderate hardness is depending on spring structure. Spring structure depends on the design and use of the purpose and use of the durability. General speaking， spring mattress spring grains mainly by the tandem lines , borders, combination. The spring is based on the merits in accordance with its durability, spring stiffness (force / displacement) and its steel wire material, wire diameter, shape of the spring, according to CNS7447 square spring mattress strict norms, spring steel wire must meet CNS3696, the provisions of the system CNS3697 do; square spring mattress durability, must be pressurized sport after repeated 80,000 times, and still comply with the standard range of CNS7447.

      For example In BA-7140 mattress durability and deflection testing machine：

      Working principle：

      This machine uses a standard shock module to simulate the effects of human action on the surface of the mattress, and given the frequency of a given compression, repeated impingement on the mattress. Also, you can do the test mattress deflection, and then assess the durability and fastness retention of spring.

　　

      Design Standards：

      According to ASTM F1566、CNS 7447、GB / T T1952.2-2011.