he invention relates to a method of manufacturing mattresses, with springs enclosed into fabric or non-woven material. This method requires the use of multiple spring-manufacturing machines for the simultaneous manufacture of the springs of each arrow of the mattress. The manufacture of the springs and the confinement thereof into fabric, or non-woven material are performed by same machine. The spring matter is composed of springs disposed parallel to each other and having their vertical axis perpendicular to the mattress plane. The springs are characterized in that their elasticity varies along the longitudinal axis of the spring so that it influences the intensity of the spring elasticity.
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