The physical characteristics of children's furniture: Density is the mass per unit volume of the material, ie the ratio of mass to volume of the material. People often feel the "heavy" substance of high density and the "light" substance of small density. Here, "heavy" and "light" essentially mean the density of matter.
First, children's furniture thermal conductivity:
(1) The ability of a thermal conductive material to transfer heat from the surface of the foot to another surface is often expressed in terms of thermal conductivity. Large thermal conductivity, is a good conductor of heat, such as metal materials, thermal conductivity is small, is a thermal insulator, such as polymer materials.
(2) Heat resistance The ability of a material to retain its excellent physical and mechanical properties under heated conditions, usually expressed in heat-resistant temperatures. The crystalline material has a melting point temperature as an index such as a metal material, a crystalline plastic amorphous material, and a conversion temperature such as an amorphous material and a glass.
(3) Thermal expansion properties The properties of expansion or contraction due to temperature changes are usually expressed by the linear expansion coefficient. Swelling takes polymer material as the largest, followed by metal material, and ceramic material as the smallest.
(4) Flame resistance and high temperature resistance of flame resistant materials. According to the material's ability to burn, it can be divided into non-combustible materials and flammable materials.
Second, adjustable child table and chair bed is not a panacea
As the living conditions of the students are now good, the large and tall students around us, the Xiaofundun students are getting more and more. The same school, the height and weight of school-age children, there is a big difference, try to choose in the purchase of Time, desks and chairs, adjustable desks and chairs, convenient management and to avoid unnecessary waste of resources.
However, studies conducted by the Education Department on desks and chairs in primary and secondary schools have found that adjustable desks and chairs also have a variety of problems.
1, adjustable desks and chairs, adjustable range, can not meet the actual needs of the situation. For example, adding 20CM to the desktop is the largest, but this student desk and chair is suitable for at least 30CM.
2. There are no professional adjustments, adjustments, and more security issues. General school staff did not maintain every table and chair, nor did they have full-time staff. The process of adjustment is mainly done by the students themselves. Some students are unable to complete the technical adjustment of the desk and chair, causing unnecessary damage and insecurity.
3, adjustable fixed firmly. Adjustable child chairs and tables, because of the solid edge of the flexibility, some of the key parts of the screw, etc., resulting in adjustable hardness is much worse than fixed. The useful life is naturally not fixed to retire as soon as possible.
4. In some cases, the school just adjusted the situation at the time when it bought the baby table and chair, and no one would readjust it when the student changed it.
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