The polyester dipping yarn has the following characteristics:
1. High breaking strength. The compressive strength of the hose is mainly borne by the skeleton layer. Improving the inherent strength of the skeleton material will help reduce the structural level of the hose, improve the performance of the hose, reduce the weight per meter and reduce the cost. 5. Good fatigue resistance and high modulus. The biggest feature of the hose is its superior flexibility, and the improvement of the flexural fatigue resistance of the hose and the resistance of the skeleton material is closely related to the fatigue resistance of the skeleton material.
2. The elongation at break and the elongation at constant load are well controllable, the twist of the wire diameter is uniform, the dimensional stability is good, and the elongation of the skeleton material is small, which will make the expansion deformation of the hose under pressure. Brake pipe is made of polyester dipped wire, and the elongation at break can be controlled at 8% to 10%, so that the expansion rate of the brake pipe can meet the requirements.
3. Small dry heat shrinkage and good high temperature stability. If the skeleton material shrinks and deforms or reduces its strength under high temperature conditions, it will adversely affect the performance of the hose, thereby affecting its service life. For example, the dipping ester wire for air-conditioning pipe, the dry heat shrinkage can be controlled to <1%, so that the deformation of the air-conditioning pipe during the vulcanization process is very small.
4. Good adhesion to rubber. In order to make the overall structure of the hose tight, in addition to the compounding of the rubber and the manufacturing process, the bonding performance of the skeleton material to the parts of the rubber layer is very important. If treated with special formula, EPDM rubber can also achieve ideal adhesion.
5. Good fatigue resistance and high modulus. The biggest feature of the hose is its superior flexibility, and the improvement of the flexural fatigue resistance of the hose is closely related to the fatigue resistance of the skeleton material.
6. Good chemical resistance. When the hose transports various media, it will not affect the performance of the hose.
7. The price is low and the supply is sufficient, which can meet the mass production. This has practical implications for the wide application of materials. The above characteristics of polyester (polyester) dipped thread fully meet the structural characteristics and specific application requirements of fiber braided (or wound) rubber hose.