The origin of the sofa dates back to ancient Egypt around 2000 BC, but the true soft-cloth sofa appeared in the late sixteenth to early seventeenth centuries. At that time, the sofa mainly used natural elastic materials such as horsehair, bird feathers and plant fluff as fillers, and the outside was covered with fabrics such as velvet and embroidery to form a soft human contact surface. After hundreds of years of development, the sofa has become a must-have for home. If you want to buy a comfortable sofa, it is very important to understand the structure and materials of the sofa.
The composition of the sofa consists of a main frame, a seating structure, an outer fabric and a filler.
Main frame of the sofa
There are three main types of sofas on the market:
1, solid wood structure - due to the shortage of timber resources, hardwood drying technology, splicing and other technical difficulties, coupled with the real solid wood structure of the sofa is quite expensive, such structural sofa is quite rare, with high value, environmental protection Good character and long service life.
2, the wood structure - the wooden side of the beam and upright support, combined with the multi-layer composite board is made of nail structure. The structural material has the advantages of low cost, simple manufacturing process, convenient molding and high manufacturing efficiency, and is a widely used process structure. However, the multi-layer composite sheet has a high formaldehyde content, which is likely to cause pollution and odor.
Extended reading: the birth of the sofa - a set of sofa production process and process
3, board and wood combined frame - the most commonly used frame type on the market sofa.
Sofa seating structure
The sitting surface is the main part of the sofa's force, and it is also the key part of the sofa comfort and service life. The seat surface structure of the sofa mainly includes rubber bandages (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, use) long life).
The sitting feel and life of the sofa have a considerable relationship with the filling. Generally, sponges and sponges are used in various densities. The higher the density, the better the rebound. However, it is necessary to pay attention to the recycling of some small factories in order to save costs. Sponge! High-grade high-elastic sponges, ordinary cushions and bags with doll cotton are more comfortable, but it is not easy to recover for a long time, and then it should be filled with down.
Sofa leather and fabric
The leather is divided into leather and PU leather. The leather is divided into yellow cowhide and buffalo leather. It can be divided into top layer skin, second layer skin and three layer skin according to the number of layers. It is divided into domestic skin and imported skin according to the origin. The imported leather is the best quality in yellow cowhide, environmental protection and color. High fastness, good elasticity and breathability, high mechanical strength, especially high tear strength and tensile strength.
The density of fabrics is related to the mechanical wear life of the sofa for a long time. The sofa fabric should be thicker. The density of the national standard sofa fabric is greater than 300G/M2, and it must be ensured that the surface is not more than 12,000 times. At present, most of China's sofa manufacturers use blended fabrics or chemical fiber fabrics. Pure cotton fabrics (shrinkage, durability, resilience) are also difficult to use on sofa surfaces.
Sofa padding
There are three main types of sofa filling:
Soft polyurethane foam (commonly known as sponge): The sponge used for sofa filling is mainly divided into three categories. The conventional sponge is a sponge produced by a conventional polyether and TDI. It is characterized by good resilience, softness and breathability. The high resilience sponge is a sponge made of active polyphosphorus and TDI. It has excellent mechanical properties, good elasticity and large compressive load. It has good flame resistance and good gas permeability. The chaotic sponge is a kind of sponge whose internal pores are similar to natural seaweeds of different sizes. It is characterized by good elasticity and excellent cushioning properties when compressed and rebounded.
Down filling: Down is made of sofa padding, comfortable sitting and small deformation for long-term use. The disadvantage is slow rebound and high cost. Generally used in high-grade sofas with sponges, or suitable for cushions.
Artificial cotton padding: Artificial cotton padding, softness, comfortable sitting, but poor mechanical properties, small compression load, only suitable for cushions.
The main points of the choice of the filling of the sofa: depending on the type of the filling, there is a big difference in the use.
Under normal circumstances, the cushion padding of fabric sofas on the market should be more suitable for high resilience sponges of 30 kg/m3 or more. In the form, most of them are filled with a whole sponge. The best form is 30 kg/cubic. Above the meter high rebound sponge and chaotic sponge combined with down or rayon superimposed to increase comfort and service life. When selecting, ask about the type of filler. If the filler is a sponge, you should know the density of the sponge used, use the gravity to feel the rebound effect of the cushion, and sit on the comfort of sitting feeling. Generally used sponge seat cushion, national standard 25KG/M3, international standard 35KG/M3. The bottom structure, the high-elastic snake spring structure is better than the bandage structure, and the high-quality bandage is better than the inferior bandage structure.
The composition of a sofa is inseparable from the four main bodies of the frame, the seating structure, the outer fabric and the filling. As long as the main parts of the four sofas are mastered, the sofa can be clearly and clearly distinguished. Judged.
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