Want a superior comfortable sleep? Oursuper king mattress in a box features independent springs for silent, motion-isolating support, and the roll-pack design makes home delivery effortless.
Whether a mattress remains flat, sag-free, and without bulges over long-term use depends critically on the material and treatment process of its internal spring units. In this pocket spring mattress, we use steel wire with a carbon content of 65%-70% for the spring core.
This carbon range ensures both moderate hardness and toughness: too low a carbon content makes the spring soft and prone to permanent deformation; too high makes it brittle and at risk of breaking under pressure. The 65%-70% range is our "balanced zone," established through long-term testing.
Two-Stage High-Temperature Heating to Ensure Compression Rebound. After the spring units are formed, they undergo two high-temperature heating treatments. The first eliminates internal stress generated during the winding process, preventing the spring from gradually softening during use. The second is performed after the pocketing process is completed, further stabilizing the spring's molecular structure.
Springs treated with these two heating stages, even when vacuum-compressed to less than one quarter of their original thickness and stored in a carton for months, will still recover to their full height simultaneously and completely upon unpacking. This process directly addresses the common industry problem of "insufficient rebound or localized sagging after unboxing a roll-packed mattress."
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Whether you choose a compact mattress in a box king single or a standard twin gel mattress in a box, this heat treatment ensures consistent performance across all sizes.
Three-Stage Heat Treatment for Extended Service Life. During the manufacturing of each individual spring unit, we add a third high-temperature heating stage. This time the focus is on improving spring ductility – the ability of the spring to return to its original shape after being compressed. In fatigue tests simulating 100,000 cycles of rolling pressure, springs that have undergone three-stage heating maintain a rebound rate above 95%, significantly outperforming ordinary springs that receive only a single heat treatment. For customers requiring enhanced support, the queen size hybrid mattress in a box delivers the same three-stage heat treatment benefits with added mattress height and foundation stability.
Hundreds of independent pocket springs work separately without interfering with each other. Whether the user is heavier, prefers side sleeping, or has extremely high requirements for their sleep environment, they will receive lasting, stable support.
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