The sofa is composed of a main frame, a seat structure, a filler and an outer fabric.
1, the main frame of the sofa currently has three main markets:
A, solid wood structure;; shortage of timber resources, hard Zamu drying technology, connection, coupled with the real solid wood structure of the sofa is quite expensive, this structure is very rare sofa.
B. Plank and wood structure; wooden beams and upright supports, combined with multi-layer composite panels made of nailed structure skeleton. Such a structural material has a low cost, a simple manufacturing process, a convenient molding, and a high manufacturing efficiency, and is a widely used process structure at present. Disadvantages: The high formaldehyde content of multi-layer composite panels can easily cause pollution and emit odors.
C. All-steel welding structure; The ordinary standard square steel pipe is welded and formed under the standard mold and it is treated with rust prevention. This kind of process is difficult to form, has long working hours and high technical requirements. Advantages: good structural stability, high strength, good environmental protection, long service life. At present, most European sofas use this structure, which is the direction for the future development of domestic sofas. Only individual brands in the Beijing market have such a structure, which is an ideal product for consumers to choose.
2, sofa seating structure
The seat is the main part of the sofa, and it is also the key part of the sofa's comfort and service life. The seating structure of the sofa is mainly rubber bandages (good elasticity but short life, easy to collapse), wooden flat (inelastic, poor sense of sitting but long service life), serpentine steel spring (good flexibility, sitting feel, use long life). Sitting surface structure, high elastic snake structure is better than bandage structure, high quality bandage is better than bad bandage structure. The high-grade sofa frame can be used in combination with a snake spring and a bandage during the production, and a cross-knitted connection between the bandage and the serpentine spring. The firmness and resilience of the serpentine spring will be strengthened even if your child is at home. Jumping on the sofa, cushions will not be deformed. Mid-range sofas mostly use medium-density fiberboard as the seat and back floor, and the middle-density sofas are covered with medium-density sponges and sprayed cotton. This cushion feels stiffer and less resilient.
3, sofa filler
There are three main types of sofa fillers
A. Soft polyurethane foams (commonly known as sponges) fall into three categories: Conventional sponges are sponges made from conventional polyethers and TDIs, and are characterized by good resilience, softness, and breathability. High-rebound sponge is a kind of sponge made of active poly-phosphorus and TDI as its main body. It features excellent mechanical properties, good elasticity, large compression load, good flame resistance and good air permeability. The hole-scraping sponge is a kind of sponge whose inner pores are similar in size to the natural seaweed. The sponge is characterized by good elasticity and excellent cushioning properties when compressed and rebounded.
B. Feather stuffing: Down is a sofa filler, which is comfortable to sit on and has a small deformation in long-term use. The disadvantage is slow rebound and high cost. Generally used in advanced sofa with sponge, or suitable for use as a cushion.
C. Artificial cotton filler: rayon sofa filler, excellent flexibility, sitting comfort, but poor mechanical properties, compression load is small, only to do cushions.
Under normal circumstances, cushion cushions for fabric sofas should be suitable for high rebound sponges of 30 kg/M3 or higher. Most of the cushions in form are filled with sponges. The best form is to use high-above 30 kg/M3. Sponge sponge and hole sponge combined with down or rayon superimposed to increase comfort and service life. When selecting, you should understand the type of filler, the density of the sponge, feel the rebound effect and comfort of the seat with gravity. General sponge cushions, national standard 25KG/M3, international standard 35KG/M3.
4, sofa fabric, leather
The density of fabrics is related to the long-term use of the sofa's mechanical wear life, sofa fabrics should be relatively thick, the national standard sofa fabric density is greater than 300G/M2, and must ensure that the surface of the friction more than 12,000 can not pilling. At present, most sofa manufacturers in China use blended fabrics or chemical fiber fabrics. Pure cotton fabrics (reduced water, durability, and elasticity) are still difficult to use on sofa surfaces.
Leather material is divided into leather and PU leather. The leather is divided into yellow leather and buffalo leather. The layers can be divided into the first layer of skin, the second layer of skin, and the third layer of skin. According to the origin, it is divided into domestic skin and imported skin. The imported skin is imported from Italy and Germany. The best quality, environmental protection, high color fastness, good elasticity and air permeability, high mechanical strength, especially high tear strength and tensile strength.