POY production process is carried out in two different ways as direct (liquid polymer) and extruder (chips fed) production.
Direct Production
The liquid polymer from the polycondensation plant is fed directly to the production positions. Every stage after these processes is the same as extruder (chips fed) production.
Extruder (Chip Feed) Production
Polyester chips cut as granules in the polycondensation facility are fed into the production wet chips silo pneumatically from the sacks or chips stock silos. The chips fed from the wet chips silo in the drying facility are sent to the extruder machine after crystallization and drying processes. After the chips dried in the extruder are melted and exposed to a certain pressure, they pass through the filtration process and are sent to the specially arranged distribution pipe system, which guarantees equal passage time of the polymer text for each production position.
Static mixers inside the distribution piping system provide a uniform temperature in the polymer meth without creating any dead spots in the piping system. Melt pumps feed the polymer meth into nozzle packs in a steady stream to be filtered and formed into filaments by squirting through tiny holes in the array. Production molyfolds are heated with HTM steam.
The steam distribution system provides a uniform temperature for all nozzles. The transmitted filaments pass through cooling cabinets where they are mixed with the laminar and uniformly controlled and conditioned air flow in which they are cooled. From here, it is fed to the winding machine through the yarn channel.
FDY Yarn Production
FDY; It is a type of yarn directed by a second drawing process of FOY yarns. Optionally, FDY yarn is produced using a second drawing machine.
Coil Making
The solidified filaments coming out of the nozzles are wound into bobbins at certain speeds. At some point, the winding speed is also a phase of the stretch-draw process. Since the winding speed of the filaments determines their place of use, the obtained filaments are also called by different names. These LOY, MOY, POY, HOY and FOY collected under five different names.
The transitions between the definitions LOY, MOY, POY, HOY and FOY are not precise and fully defined.. For this reason, the definitions are made according to the degree of orientation (harmony) rather than the winding speeds.
>>>>> LOY (low oriented yarn): It is a low oriented yarn. It is obtained at winding speeds up to 2000 m/min.
>>>>> MOY (medium oriented yarn): It is a moderately oriented yarn. It is obtained from winding speeds up to 2000 – 3000 m/min.
>>>>> POY (partially oriented yarn): Partially oriented yarn. 3000 – 4000 m/min. obtained at winding speeds between
>>>>> HOY (highly oriented yarn): It is a highly oriented yarn. 4000 – 6500 m/min. obtained from the winding speeds between
>>>>> FOY (fully oriented yarn): It is fully oriented thread. 6500 m/min. obtained from the winding speeds on the
As a result of all processes, the filaments are wound into bobbins either as monofilament yarn or multifilament yarn, with or without twist.
The filaments can be made into yarn in cotton or wool systems by being stapled. In addition, it is wound into bobbins as filament directly as yarn. The winding process is the final stage of filament spinning.
In the coil winding part, the number of coils can be one or more. This number may vary depending on the manufacturer. In addition, where the winding yarn will be used also affects the number of bobbins.
Coil winding amount is determined by time (seconds). The winding time is 600 to 800 seconds on average. This time varies according to the denier value. When the bobbin winding process is completed, the bobbins are replaced with an empty bobbin with the automation process.
Coil winding speed 500 – 6500 m/min. varies between A decrease in strength was observed in filaments with a winding speed exceeding 6500 m/min.
Coil winding shape varies according to the trolley (guide) used. Either cross-winding or sequential (side-to-side) winding takes place.
The winding tension is adjusted according to the speed of the roller, the speed of the traversing and the speed of the bobbin rotation. The winding tension should be the same throughout the whole winding.
It is the part where the bobbin filament yarns are wound crosswise on the bobbin in long lengths. There are some points to be considered in the coiling process.
These Ones;
>>>>> Winding speeds,
>>>>> Winding tension,
>>>>> Winding shape,
>>>>>>It is the number of coils.
Coiling Stages
When the winding process starts, the filaments that become yarn are controlled by the yarn sensor. The task of this sensor is to stop the machine when the yarn breaks.
The yarn passing through the sensor comes to the roller (scan-rool) part. Here; It reaches the bobbin shaft on which the bobbin is attached and is wound on bobbins. There are walkers on the coil shaft. In general, these travellers consist of two diagonally mounted knives. The task of these knives is to prevent the tangling of the yarn coming to the travellers.
POY Winding Unit
Two godet winders are wound on individual filaments at high speed. A detector that detects filament breaks is equipped with filament cutting and suction systems to prevent damage to the winding head and traverse system in case of filament breakage. A reserve tip is automatically wound onto each bobbin before package formation begins. A party clock provides the exact coil weight based on the coil run time. Filled bobbins are removed from the spindle of the winding head with the aid of a bobbin removal device. Filaments produced by the high speed winding process have a pre-orientation resulting in a long storage life.
FDY Winding Unit
The winding unit is equipped with two lower and one upper inductively heated godets for each production position. The filament is drawn by the first godet and the draft is determined between the first godet and the second godet. A detector that detects filament breaks is equipped with filament cutting and suction systems to prevent damage to the winding head and traverse system in case of filament breakage. A reserve tip is automatically wound into the coil pack before starting pack formation. The required spin-finish is applied to the filaments with a lubrication system placed in front of the first godets. Regularly applied spin-finish filaments are important for further processing. After the bobbins are full, they are removed with the help of the bobbin removal device and placed on the hangers regularly.
External friction false twist texturing machine
It is to provide the desired volume and elasticity of the yarns and fabrics produced by giving the desired curly shape to the filaments with an externally friction false twist texturing machine.
Duties
It is to provide the desired volume and elasticity of the yarns and fabrics produced by giving the desired curly shape to the filaments with externally friction false twist heads. In the early days of this technique, there are 7 steps to achieve the desired texture effect. These: winding, twisting, heat transfer, unwinding, untwisting, folding and winding. These were made on different machines in the early development years of the technique. With the development of technology and the manufacture of new machines, it has become a process with only 4 stages. These can be listed as twisting, heating, cooling, lubrication and winding.
Features of poy yarns used in external friction false twist texturing machine During filament yarn production, partially oriented yarns are produced at winding speeds of around 3500 m/min. These yarns produced “poy yarn” It called.
What are impacted teeth?
When one or more teeth fails to grow in the correct position and is therefore held below the normal gum line, it is called an impaction. This can be complete, such as completely unerrupted (buried) third molars (wisdom teeth) or partial when just part of the tooth is visible in the mouth.
Why are impactions important?
For best function and appearance the teeth should grow in a healthy alignment. When one or more teeth is impacted, this can affect the function of that tooth but also the function and appearance of other teeth.
Whether all impactions should be treated is still controversial and your dentist and oral and maxillofacial team can explain the advantages and disadvantages or treatment for you, which is usually surgical.
-Poy threads have long (60-90 days) vertebrae. If the texturing process is not done within this period, yarn breaks etc. problems may occur.
- It can be packed more properly.
- It has better heat treatment properties.
- It is less affected by the change of climate conditions than other yarns.
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