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The chemical and physical properties of slow rebound memory foam
Time:2020/6/30 11:02:03    

(1) Chemical properties

  Allergic slow rebound memory foam is specially designed for the human body, so there is a huge amount of use in the world, but there have been no reports of allergies. Human skin will feel very close and compliant with the slow-rebound memory foam. Bacterial reproduction Slow rebound memory cotton is a high-molecular material bacteria and microorganisms are difficult to grow and reproduce on the slow rebound memory foam material, so it is recognized as having antibacterial and anti-mite effects. After the sweat, saliva and other components are contaminated on the slow-recovery memory foam, it will not produce a corrupt odor because bacteria and microorganisms are difficult to survive. This is the deodorizing function of slow rebound memory foam.

   The main mission of the slow-recovery memory foam after birth is to absorb the huge impact of astronauts when the spacecraft hits the ground. Similarlyit is also a natural application environment for slow-rebound memory foam on civilian vehicles with high-speed movement. It can automatically adapt to various human body shape deformations and serve different individuals and different parts without making the individual shape in advance. Balanced surface pressure for different pressures in three dimensions, the slow rebound memory cotton can provide the most average support force after shape adjustment to eliminate stress concentration. Insulation slow memory foam has certain thermal insulation performance and changes with the season temperature. It has remarkable anti-bacteria, anti-mite and anti-mildew properties, and can remove odor, and has excellent breathability and moisture absorption performance.

 

(2) Physical properties

 

A. Thermal performance

    Slow-recovery memory foam also has special performance in temperature, as some materials say: it contains slow-rebound memory particles with slow temperature, slow-rebound memory foam can reflect your temperature within 5-10 minutes, and the hardness is sensitive to body temperature. When the temperature reaches about 37 degrees, its softness is suitable for the human body's feeling and when the temperature of the human body drops, it becomes slightly harder. Another performance of slow-rebound memory foam in humidity is more peculiar. In summer, the skin will feel cool when it comes into contact with slow-recovery memory foam, as if it is wet; in winter, it will feel warm, but it will not feel sultry.

B. Mechanical properties

    The main physical properties of slow-rebound memory foam is "slow-rebound sponge". Its meaning is in terms of mechanical properties: when the slow-rebound memory foam is deformed by external force, it will not rebound immediately, but it will be delayed for a few seconds and slowly restored, so we can see our handprints when we press the memory foam by hand. It seems that the slow rebound-memory foam can remember the shape of the things that oppress it and the name "slow-rebound memory foam" is also derived from it. The reason why the slow resilience of the slow rebound memory foam is mainly due to its special particle structure-honeycomb structure: under the microscope, the smallest unit of slow-rebound memory foam consists of tiny cell compartments (cells). The cell walls of cells are dense and can contain air, but only micropores communicate with the outside world and other cells. Each cell structure is very uniform. There is a huge difference between the smoothness and isolation of the gas between the small cells in the ordinary sponge. Under the influence of atmospheric pressure, the gas enters the cells to determine the main mechanical properties of the slow rebound memory foam. After the air is pushed out of the cell and the cell is squashed, although the external force has been removed, and the cell wall also has a reduced elasticity, the air cannot quickly return to the cell due to the small vent hole, and the cell cannot quickly recover its shape. The force of the projectile is suppressed, and the time for the material to recover from deformation is extended. The commonly method of material performance inspection is to press the slow-rebound memory foam with the palm of your hand and then take it away, you will find a handprint apparently appears on the surface of the slow-rebound memory foam. It seems to have been shaped, but it recovers without traces after a while and completely restores the mechanical properties which is quite different from the creep of biological materials.

C. Hygroscopic performance

The hygroscopic performance of the slow-rebound memory foam is outstanding. It can be dried quickly after being wet If it is a sponge, while slow-rebound memory foam takes a long time. It is very heavy after absorbing water and it is difficult to dehydrate in the washing machine. Slow-rebound memory foam is breathable which is the first condition for ensuring its mechanical properties, as evidenced by the comfortable feeling after long-term skin contact. Compared to many high resilience materials, the skin is easily stuffy on these materials which use completely enclosed cells to isolate the flow of gas to generate elasticity.

There are two manufacturing processes for slow rebound: cutting and molding. Cutting is to cut the purchased slow-rebound sponge into a pillow shape, because the molding is based on cutting rather than mold plus additives, no other additives are added so the density of pure polyurethane can only be 100D. The molding is with a series of steps such as adding additives, foaming and mold pressing. Due to the addition of other additives, including chemical additives such as foaming and softening, the density is increased to a maximum of about 150D which can have a good feel.

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