There are mainly three kinds of fillings for sofas:
A. Soft polyurethane foam (commonly known as sponge): sponges used for sofa filling are mainly divided into three categories: conventional sponge is a kind of sponge generated by conventional polyether and TDI as the main body. It is characterized by good resilience, softness and permeability; High resilience sponge is a kind of sponge with active polyphosphate and TDI as the main body. It has excellent mechanical properties and good elasticity. Large compression load, good flame resistance and air permeability; The random pore sponge is a kind of sponge similar to the natural seaweed with different pore diameters. It is characterized by good elasticity and excellent buffering property during compression and rebound.
B. Down stuffing: Down stuffing can be used as sofa stuffing, which is comfortable to sit on, small deformation in long-term use, and has the disadvantage of slow rebound and high cost. Generally, it can be used together with sponge in high-grade sofa, or it is suitable to be used as cushion.
C. Artificial cotton filler: artificial cotton is used as sofa filler, which has excellent softness and comfortable sitting feeling, but poor mechanical performance and low compression load, so it is only suitable for cushion. Selection point of fillings for sofa: according to different types of fillings, there are great differences in use. In general, the cushion filler of fabric sofa should use a high resilience sponge of more than 30 kg/m3, which is more appropriate. In the form, most of them use a whole sponge to fill. The best form is to use a high resilience sponge of more than 30 kg/m3 and a random hole sponge combined with down or artificial cotton to increase comfort and service life. When selecting, you should ask about the type of filler. If the filler is a sponge, you should know the density of the sponge used, feel the rebound effect of the cushion with gravity, and feel comfortable when sitting.
Sponge cushion is generally used, with national standard of 25KG/m3 and international standard of 35KG/m3. Bottom structure, high elastic snake spring structure is better than bandage structure, and high-quality bandage is better than low-quality bandage structure. After a long time of compression, it can still rebound quickly, restore the original, without deformation and collapse.
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