Due to the large elasticity of the rubber, the elastic modulus is low, and the core is easily deformed under the action of external force, so the textile material or gold is used.
Comparison of various fiber properties
The basic characteristics of cotton fiber are high wet strength, low dry strength, low elongation, good adhesion to rubber, poor heat resistance, poor fatigue resistance, poor strength, and relatively thick fibers. It is the lowest strength of the conveyor belt.
Man-made fiber, also known as viscose fiber, has higher strength, better heat and thermal conductivity, less heat generation, fatigue resistance, higher initial modulus of elasticity, better dimensional stability, but greater hygroscopicity than cotton fiber. The strength is greatly reduced.
Polyamide fiber, commonly known as nylon, conveyor belt is often used nylon 6 and nylon 66, compared with cotton fiber and rayon, the strength is 1.5-1.8 times higher, lower hygroscopicity, deformation, shrinkage Large, poor dimensional stability, and poor adhesion to rubber.
Polyester fiber, commonly known as polyester, has higher strength but slightly lower than nylon, low elongation, good strength, good heat resistance, good fatigue resistance and good dimensional stability, but wear resistance is inferior to nylon. The rubber bond is also poor, but it combines the sex palace and the nylon palace.
Polyvinyl alcohol fiber, commonly known as vinylon, has less strength and modulus than nylon, has poor heat resistance and a large drop in wet strength.
Glass fiber, if calculated according to specific strength, glass fiber has the highest strength, high initial elastic modulus, low elongation, high relative density, no moisture absorption, good heat resistance, corrosion resistance, electrical insulation and heat insulation. The disadvantage is that it is not wear-resistant, is not resistant to fatigue, and has poor adhesion to rubber.
Aramid, commonly known as aramid, is known as synthetic steel wire. It has the advantages of synthetic fiber and steel wire, and has the characteristics of low relative density and good chemical corrosion resistance.
Steel cord, which has high strength and low elongation, generally only 0.2% to 0.3%. It is evenly spaced and embedded between the cover layers.
In summary, aramid, nylon and polyester have good fatigue resistance, high strength and weight [匕, especially suitable for conveyor belts with a wide range of strength, after heat setting and impregnation, they are under working load It can bond well with rubber and has low elongation. However, the high elastic modulus of polyester is just used to design the warp of deep groove conveyor belt. The elongation of polyester is less than 1%, while the nylon is 2%. 2.5%. The former is suitable for long distance transport and the latter is suitable for arc operation. 2. The effect of weaving method on strength.
The core of plain or oxford fabric made of nylon as the weft thread has good impact resistance, tear resistance and groove formation, and the relative density is small. It is made into a core structure with low radial collapse, which can improve its core structure. Tensile performance, belt strength up to 700kN / m. What is to be explained here is Oxford or fabric. In the plain weave fabric, the radial direction is changed to two pieces. This structure is a 2X1 mat structure, commonly known as Oxford tissue. Of course, it can also be composed of 2 wefts to form a 2X2 mat. The texture, or 3X 3, 4X 2, etc., can be high core tear strength. In the case where the length of the belt is constant, the higher the modulus of elasticity, the longer the transition section; the smaller the modulus of elasticity, the shorter the transition section. For the small modulus of nylon and the large modulus of the wire rope, the former has a large elongation and the latter has a small elongation.