Characteristics and Characteristic Function of Polyurethane Slow Springback Material

1. Temperature Sensing Characteristics

It refers to the induction of human body temperature, gradually softening up, while absorbing human pressure to adjust the body to the most comfortable posture state. For the part below which does not touch the human temperature, it still maintains sufficient support force.

2. Viscoelastic properties

When the pressure is removed, the product will gradually return to its original shape (e.g. spring recovery). The term "slow rebound" is called "zero pressure sponge", which means that when lying on it, it feels like floating on the water/cloud, and the skin does not feel oppressive. In fact, slow rebound materials can be irregular. The shape of the compression adjustment for the most balanced state, that is, slow deformation to adapt to the compression of the object, but also to provide the most uniform support. The blood circulation pressure of human skin is 36 mmHg. High-grade memory sponge material (to achieve 10-15 seconds slow rebound time) can distribute pressure uniformly at each point, and then reduce the pressure to below 36 mmHg. It makes people feel blood flow smoothly, as if there is no place to oppress, not that there is no pressure on memory sponge.

The excellent performance of memory foam materials in various application fields is due to its special viscoelastic properties, that is, elastic deformation (energy storage deformation) which meets Hooke's law and irreversible plastic deformation (energy dissipation deformation) occur simultaneously when the materials are impacted by pressure. That is to say, the deformation of memory foam is an organic combination of these two kinds of deformation. Plastic deformation consumes most of the impact energy (more than 90% can be absorbed under special formulation). The part of energy accumulated by elastic deformation can make the memory foam material recover to its pre-compression shape slowly after the removal of external force (the reason why it needs to recover slowly is that the part of energy accumulated by elastic deformation needs to pull the displaced molecule back to its original position).

This characteristic makes the memory foam material show:

As a shock buffer material, it has a strong shock energy absorption capacity, and reflects a very small rebound force on the pressure object (or human body) contacted with it. The rebound force of the buffer material is the direct cause of the damage to the protected object or human body under high impact. As a cushion product material, the pressure is approximately static pressure, and under such pressure, the molecular structure of memory foam material will be "flow" displacement, deformation to fit the pressure surface contour, the support point will spread to the whole contact surface, so that the pressure can be dispersed on the whole contact surface. This feature is known as the "uniform pressure dispersion characteristic" of memory foam. When a person is sitting on a mattress made of memory sponge, because the pressure is dispersed, there is no pressure concentration point in the body, the comfort is greatly improved, and the bedsores caused by blockage of blood circulation caused by long-term pressure compression also achieve good preventive effect. After special modification, the material has even better soft touch than ordinary sponge. At the same time, the Open-cell molecular structure of the material is similar to the cell structure of human body and has better compatibility with human body, which makes the memory sponge material widely used in the field of medical rescue.

These characteristics have doomed this material to play an increasingly important role in people's lives, and today's facts have proved the same.