Detailed explanation of the internal structure and composition of sofa

Detailed explanation of the internal structure and composition of sofa

The origin of sofa can be traced back to ancient Egypt around 2000 BC, but the real Upholstered Sofa appeared from the end of the 16th century to the beginning of the 17th century. The origin of sofa can be traced back to ancient Egypt around 2000 BC, but the real Upholstered Sofa appeared from the end of the 16th century to the beginning of the 17th century. At that time, the sofa was mainly filled with natural elastic materials such as horse mane, bird feather and plant wool, and covered with fabrics such as velvet and embroidery to form a soft human contact surface. After hundreds of years of development, sofa has already become a necessity at home. If you want to buy a satisfactory sofa, it is very important to understand the structure and materials of the sofa first.

The sofa is composed of a main frame, a sitting surface structure, external fabrics and fillers. 1、 At present, the main frame of sofa has three kinds of A. solid wood structures in the market – due to the shortage of wood resources, the drying technology of hard miscellaneous wood and the connection of mortise and tenon are technically difficult. In addition, the sofa with real solid wood structure is quite expensive. This kind of structure sofa is quite rare, with high value, good environmental protection, long service life and other characteristics. B. Board wood structure – a structural framework made of wood beams and vertical supports, combined with multi-layer composite boards and nailed. This kind of structural material has the advantages of low cost, simple manufacturing process, convenient molding and high manufacturing efficiency. It is a widely used process structure at present. However, the multi-layer composite board has high formaldehyde content, which is easy to cause pollution and emit peculiar smell. 2、 The sitting surface structure of the sofa is the main part of the sofa under stress, and it is also the key part of the comfort and service life of the sofa. The sitting surface structure of sofa mainly includes rubber bandage (good elasticity but short service life, easy to collapse), wooden flat plate (no elasticity, poor sitting feeling but long service life), snake shaped steel spring (good elasticity, good sitting feeling and long service life). The sitting feeling and service life of the sofa also have a considerable relationship with the filler. Generally, sponges are used. Sponges are divided into many kinds according to density. The higher the density, the better the rebound. However, it should be noted that some small factories use recycled sponges in order to save costs! The high-grade ones use high elastic sponges, and the ordinary cushions and stuffed dolls are more comfortable, but it is not easy to recover after a long time. The more high-grade ones need to be filled with down. 3、 Sofa leather and fabric leather are divided into leather and PU leather. Leather is also divided into cattle hide and buffalo hide. According to the number of layers, it can be divided into first layer leather, second layer leather and third layer leather. According to the origin, it can be divided into domestic leather and imported leather. The imported leather has the best quality, environmental protection, high color fastness, good elasticity and permeability, high mechanical strength, especially high tear strength and tensile strength. The density of fabric is related to the long-term mechanical wear life of sofa. Sofa fabric should be thick. The density of national standard sofa fabric is greater than 300g/m2, and it must ensure that the surface does not pilling after friction for more than 12000 times. At present, most sofa manufacturers in China use blended fabrics or chemical fiber fabrics, and pure cotton fabrics (shrinkage, durability, resilience) are still difficult to be used on the surface of sofas. 4、 There are three kinds of fillings for sofa. A. artificial cotton fillings: artificial cotton as sofa fillings has excellent softness and comfortable sitting feeling, but it has poor mechanical performance and small compression load, so it is only suitable to be used as cushion. B. Soft polyurethane foam (commonly known as sponge) can be divided into three categories: conventional sponge is a kind of sponge mainly produced by conventional polyether and TDI, which is characterized by good resilience, softness and permeability. High resilience sponge is a kind of sponge mainly produced by active polyphosphate and TDI. It is characterized by excellent mechanical properties, good elasticity, large compression load, fire resistance and good air permeability. Porous sponge is a kind of sponge similar to natural algae with different sizes of inner pores. It is characterized by good elasticity and excellent cushioning during compression and rebound. C. Down stuffing: down is used as sofa stuffing, which is comfortable to sit and has small deformation after long-term use, but the cost is also high. Generally, it is used together with sponge in high-grade sofa, or it is suitable to be used as cushion. The composition of a sofa cannot be separated from the four main bodies of the frame, sitting surface structure, external fabric and filler. As long as we master the main parts of the four sofa production, we can clearly distinguish and judge the quality of the sofa.

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