Bonnellfederkern

Bonnellfederkern is a type of innerspring mattress core used in mattresses and upholstered furniture. It consists of a grid of interconnected hourglass-shaped steel springs, known as Bonnell coils, that run parallel to each other and touch one another. The coil grid is usually bound by a surrounding wire frame to maintain edge stability and overall shape. The springs are typically made from tempered steel wire and are linked by a network of transverse and longitudinal wires, forming a single, cohesive support unit.

When weight is applied, individual coils compress and distribute the load to adjacent coils. Because the coils are interconnected, the mattress generally provides uniform support across the surface, but it also tends to transfer motion more readily than designs that use individual pocketed springs. The open coil structure allows relatively good air flow, which can contribute to a cooler sleep surface.

Bonnellfederkern mattresses are commonly found in budget to mid-range products. They are inexpensive to manufacture, robust, and suitable for heavy users, but they offer less contouring and edge support compared with pocket-spring systems. They can be paired with various comfort layers such as foam or latex to modify feel and temperature management.

Typical considerations when choosing a Bonnellfederkern mattress include firmness level, the thickness of the comfort layers, and anticipated durability. Lifespan varies with coil gauge and usage but is generally adequate for regular household use; sag resistance can be improved with layered upholstery and proper support.