The FIBC Big Bag Raw Material – Monofilament
As the raw material of fabrics and belts (loops), monofilament is mostly used in the form of high-strength PP monofilament, For the production workshop using rigid belts (loops), it is relatively appropriate to select the monofilament extrusion line accordingly, a suitable stretching line will also affect the rate of finished products in the next process of circular loom and needle loom.
Type II ( Model MONO ) FIBC Big Bag Extrusion Line
In the Monofilament extrusion line, the main process includes that pp masterbatch is fed into the extruder for heating through batching, mixing and feeding devices, the raw material PP masterbatch is completely softened and plasticized under the action of two basic structural screws and screw barrel of extruder system.
In addition, the raw materials in the screw are extruded and preheated to reach a certain melting degree, through continuous compression, the raw materials are finally mixed and melted uniformly, so that all the raw materials are melted. At specific temperature, the resin strip is extruded through a spinneret die, then cooled and shaped in a cold-water tank. After the embryonic filament is shaped by the first stretching of five rollers, the shaped filament enters hot water tank ( hot oven ) shaped. To prevent embryonic filament from shrinking after shaping, the embryonic filament can be reshaped by secondary stretching with five rollers. If there is demand for embryonic filament pattern forming and softness, the embossing device and fibrillation device can be selected, then the tape can be collected by using the tape winder. Meanwhile, the quality of yarn spindles will also affect the use of circular loom and belts (loops) weaving in the next process. Relatively good tape spindles can reduce the blemish rate of woven fabric and belts (loops).
Note: For some devices equipped with a monofilament extrusion line, it is necessary to combine the process requirements and the internal environment of the production workshop. For example, in the relatively low internal and external temperature environments, a hot-water tank is usually more suitable for the plant. However, selecting the hot water tank, which will cause rust on the machine for long time; Select the shaped hot oven. Usually, the environment where the plant is located is relatively high in relative humidity and the hot oven can completely stretch and heat the embryonic filament. However, the hot water oven of monofilament extrusion line has lower specific heat capacity than the hot drying foil, dielectric temperature is unstable and the temperature loss is higher.
The combined output is related to extruder ability and melting ability, the screw and the round die of spinneret are the core part, so the number of monofilaments depends on the number of holes in the spinneret.
Folded Monofilament
Generally, the loops (belts) are divided into soft loops and hard loops.
In the process of manufacturing loops, high-strength loops are mainly produced, the filament folding device can be added after the embryonic filament of the filament extrusion line is cut, usually using the three folds device. The device mainly solves the problem that in the weaving process, fabric-cell and extrusion of wide filaments become narrow filaments, which will increase the fabric-cell force and friction force for the manufacturing process. The weft and warp filaments will be pilled, split or broken, which will affect the normal production of weaving. Three folds device can improve the absolute strength, reduce the weight per unit area and save the cost of raw and auxiliary materials. The weft extrusion force and friction are reduced, the yarn breakage rate is reduced.
Moreover, when using interwoven folded filaments in production, the stress is relatively uniform compared with that of monofilaments. Meanwhile, when working in the next working process, the qualified rate of fabric surface is improved and the labor intensity of operators is reduced and the consumption of monofilament lubricating oil is saved. Simultaneously, it is suitable for plant or enterprises with high cleanliness.
