This type of thread is made by using super bright and semi dull polyester (PET) chips and using the latest white and colored machines (using masterbatch with colored grains). It is produced that no longer need rose color in other stages.
POY polyester yarns are produced at a speed in the range of 2800 to 3600 meters per minute and do not have a high degree of crystallinity. The composition of their structure is such that it allows them to be stored for several months without becoming brittle or changing their shape.
Like polyester, nylon and polypropylene yarns, POY yarn is produced by melt spinning. As mentioned, polyester chips are used to produce this thread. In this way, they transfer the chips into the tanks with air pressure. Chips will be entered into the crystallizer according to the specific capacity and amount. After doing this step, the chips will not stick together and their moisture will be removed in this step. After drying, the polyester chips will enter the extruder. Then the chips are melted and transferred into the spinning tubes. After that, the molten polymer will enter the thread production department. When the molten polymer comes out of the small holes that are installed on the device, the fiber strand is made.
After that, this melted polymer is sent into specific tubes and transferred to the spinning head section. In order to prevent the lowering of the temperature and the hardening of the molten polymer, all the movement systems are transferred inside a double-walled pipe system, on the sides of this molten polymer, a certain oil with a special temperature with an accuracy of ±1˚C, as well as a double-walled control system. It will happen that the molten polymer does not experience any temperature change. If the minimum temperature change occurs in this process, the molten polymer will not have suitable conditions for production.
After that, the molten polymer will be directed to the pumps. The pumps system is metering. This part is one of the main parts of POY yarn production. The pumps are used in the form of gear wheels and control the exact amount of material passage in such a way that each pump must pass the precise and specific amount of molten polymer according to the grade of yarn produced.
After that, the molten polymer will enter the spinning spinnert. In this section, they will be formed with flow rate, capacity and grade of thread. This means that by passing this molten polymer through very small holes, threads with a special number will be produced.
In the quenching stage, this molten polymer, which has come out in the form of very thin threads from the very small holes of the spinnerets, will be cooled. This method will be done with special air, temperature and humidity level.
After quenching, oiling will be done to the made POY thread. Spinning oil is given to the yarn to create a glaze. This action makes the next stages of making POY yarn more accurate and finally, the POY yarn made on special multi-layered cardboard spindles (bobbins) will be wound by precise and sensitive devices called winders. This item is very sensitive and accurate so that the traction and acceleration of the device will be digitally controlled.
The last stage of removing the cardboard bobbins of POY thread from the same Winder Duff machine is called. Duff is done in two ways: Automatic duff and manual duff, in manual duff, the work steps must be done very carefully.