High tenacity and low shrinkage products, as well as some low-shrinkage products, are mainly used in tire cords, mining conveyor belts, transmission triangle belts, safety belts, lifting belts, PV C coated fabrics, fire hoses, hoses, etc.
2 The main application of existing products. The original intention of the development of polyester industrial filament is to use polyester to replace rayon, nylon 6, nylon 66, etc. as the reinforcing frame material of rubber products. These products include radial tire cord fabric, rubber conveyor belt cord fabric, triangle belt, transmission belt cord, rubber hose cord and cord fabric, etc.
2.1 Ordinary radial tire cord fabric standard type (ordinary type) polyester industrial filament, also known as high-strength low-stretch series. Its important features are high strength, low elongation, and high thermal shrinkage. Typical specifications.
The cord fabric woven from this type of industrial silk has the characteristics of high strength and low elongation under constant load, but the dry heat shrinkage rate is relatively high. Therefore, when using this kind of cord fabric to make tires, the phenomenon of concave joints is obvious. The vulcanized Jinshan oil chemical fiber has a variety of specifications, elongation, dry heat shrinkage, and constant load elongation. After that, it must be inflated and shaped, and can only be vulcanized at room temperature. The vulcanization time is long, the tire scrap rate is high, the production efficiency is low, and the grade of the made tires is low, which cannot meet the requirements of high-performance radial tires.
2.2 Conveyor belt, conveyor belt, hose 2. 2. 1 Conveyor belt Conveyor belt with polyester industrial yarn as the main skeleton material, has the advantages of high strength, thin belt body, good flexibility and groove forming. Conveyor belt manufacturing is divided into two categories: one is rubber conveyor belt and the other is whole core belt. The specifications of the polyester industrial yarn used are shown in the rubber conveyor belt. The high-strength and low-elongation industrial yarn is used as warp yarn, nylon 66 or nylon 6 is used as weft yarn, woven into polyester nylon canvas, and then subjected to two-bath dipping treatment, after rubber rolling, vulcanization After heat treatment, it finally becomes a rubber conveyor belt.
Variety and specification elongation, dry heat shrinkage, constant load elongation, PV C whole core belt is made of high-strength low-strength industrial silk and cotton yarn mixed twist as warp yarn, low shrinkage type industrial silk and cotton yarn mixed twist as weft yarn, woven into a whole The core tape is then subjected to PV C dipping, and the outer layer is plasticized to become the final PV C core tape.
Because polyester has the following advantages in terms of performance:
1) Good moisture resistance, it can maintain its strength after being damp, suitable for use in wet mines.
2) The modulus is high. When designing the conveyor belt, the safety factor can be lower than that of nylon.
3) The constant load elongation is small, the dimensional stability is good, and the belt tensioning stroke is small, eliminating the need for readjustment due to stretching deformation.
4) High impact resistance, so the tape has good strength and impact fatigue resistance.
Therefore, in the field of conveyor belts in recent years, the consumption of polyester industrial yarns has increased greatly. Especially in coal mine conveyor belts, most of them use polyester industrial yarns as the core conveyor belt. Make this industry a big consumer of polyester industrial yarn.
2.2.2 V-belt conveyor belt cords. The cords made of polyester industrial yarns after initial twisting, double twisting and dipping have higher strength and initial modulus than rayon, and have good flex fatigue performance. Therefore, it is widely used in various specifications of triangle conveyor belts. In developed countries, the skeleton of the triangle conveyor belt has already been polyester. In recent years, the polyester cord market has developed rapidly due to the increase in domestic production of polyester industrial yarns and the increasingly perfect polyester dipping process.
2.2.3 Rubber hose cords. The reinforcing materials used in the rubber hose industry in our country are cotton varieties, specifications, elongation, dry heat shrinkage, constant load elongation, Jinshan oil chemical fiber cloth, vinyl cotton blended fabric, and traditional clamps. Mainly cloth hose. With the development of rubber production, braided pipes and winding pipes have gradually phased out cloth-filled pipes. The thread made of polyester industrial yarn by twisting and shaping (or dipping) is the most ideal skeleton material for the production of braided hose and winding hose. Polyester cord not only has high strength, good dimensional stability, but also has good chemical stability. Unlike vinylon silk as the skeleton of a hose, it will be resinized when exposed to water, which will affect the service life of the hose.
The typical industrial yarn varieties and specifications used for ordinary rubber pipeline ropes are shown in the varieties and specifications elongation, dry heat shrinkage, and constant load elongation. 2.3 Vehicle safety belts are technically improved on the original high-strength and low-extension industrial yarns. High-strength wear-resistant industrial yarn series products, instead of imported industrial yarns, are used as special yarns for car seat belts. The car seat belts produced by it are scratchy, wear-resistant, strong and durable. See the table for the specifications of vehicle seat belts variety specifications elongation, dry heat shrinkage, constant load elongation, this variety is also widely used in lifting belts.
Pictures for polyester yarn 1000D: