Our Polyester POY Physical Indicators
The polyester POY industry is developing rapidly and the demand is large. In order to better meet the needs of high-end customers, Salud Style has formulated corresponding physical index standards for polyester POY to better enhance the overall development of the industry and improve its own competitiveness. This standard will be applied to our polyester POY products. From the perspective of market demand development, the standard has reached the high-end positioning requirements of world-class products. The formulation of the standard will help improve the product quality and overall technical level of polyester pre-oriented yarn (POY), and establish a higher standardized production for other enterprises. It will even have important guiding and guiding significance for the improvement of the overall industrial quality.
| Physical index of polyester POY |
| serial number | Indicator name | AA | A | B | C |
| 1 | Linear density deviation rate (%) | ±2 | ±2.5 | ±3 | ±3.5 |
| 2 | Linear density variation coefficient CV (%) | ≤0.6 | ≤0.8 | ≤1 | ≤1.2 |
| 3 | Breaking Strength (CN/dtex) | ≥2.2 | ≥2 | ≥1.9 | ≥1.8 |
| 4 | Breaking strength coefficient of variation CV (%) | ≤4.5 | ≤7 | ≤8 | ≤10 |
| 5 | Elongation at break (%) | M±4.0 | M±8.0 | M±10.0 | M±12.0 |
| 6 | Elongation at break coefficient of variation CV (%) | ≤1.5 | ≤8 | ≤9 | ≤10 |
| 7 | Evenness U value (%) | ≤0.8 | ≤1.28 | ≤1.44 | ≤1.6 |
| Evenness CV value (%) | ≤1 | ≤1.6 | ≤1.8 | ≤2 |
| Remark | 1. The linear density deviation is calculated based on the nominal linear density. |
| 2. M is selected in the range of 90~150, and under normal circumstances, no arbitrary changes will be made, but if due to the exchange of raw materials and other reasons, the central value can be adjusted appropriately. |
| 3. The normal method is used for the evenness of evenness, and the U value or CV value is determined with the instrument. |
Our Polyester POY Appearance Inspection Standard
| serial number | project | grade |
| AA level | Class A | Class B | Class C |
| 1 | Wool (root/tube) | dpf≥1.2D | 0 | ≤4 | ≤12 | |
| dpf＜1.2D | 0 | ≤6 | ≤12 |
| 2 | Color (the inner and outer layers are the same) | normal | normal | obviously abnormal | |
| 3 | Oil stains cm | 0 | ≤1 | ≤4 | |
| 4 | Forming (shoulders or belly) | better | better | Difference | |
| 5 | tail wire (circle/tube) | ≥1.5 | ≥1.0 | | |
| 6 | Trip wire (root/tube) | dpf≥1.2D | 0 | ≤2 | ≤12 | |
| dpf＜1.2D | 0 | ≤3 | ≤12 |
| 7 | Drum weight (net weight) kg | M4±0.04 | ≥3 | ≥2 | ≥1.5 |
| prepare Note | 1. The linear density value is dtex. 2. The symbol ' ' indicates that this grade is not judged. 3. Appearance inspection requires no bumps. 4. Class A trip wire refers to the front of the wire ingot and the length is less than 3cm. |
Features Of Our Polyester POY Production Process
The quality of POY is the basic guarantee of the texturing process. According to the characteristics of coarse denier and porous number, the main production process of POY in our factory is determined as follows.
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Spinning Speed
If the spinning speed of polyester POY is too high, there will be many broken ends and more wool in the post-processing. Table 1 shows some quality indexes of POY and DTY under three spinning speeds. It can be seen that the spinning speed of 3250 m/min is better.
| Table 1 Quality indexes of POY and DTY at different spinning speeds |
| spinning speed | POY Strength (cN/dtex) | POY dry | Post-processing end breakage rate | Wool (%) | Stiff wire (%) | M rate (%) | DTY intensity (cN/dtex) |
| 3200m/min | 2. 20 | 1.26 | few | 1.2 | 2.1 | 94.2 | 3.16 |
| 3250m/min | 2. 29 | 1.27 | few | 1.3 | 0.3 | 95.9 | 3.49 |
| 3300ni/min | 2. 30 | 1.32 | many | 3.4 | 1.8 | 95 | 3.4 |
Spinning Pack
In the process of polyester POY spinning, the spinneret bulking rate should not be too large, otherwise, the melt will be easily broken, or the filament fineness and evenness, sticking to the board, injection head, etc. The spinneret of ×96 specification uses its larger aspect ratio to reduce the bulking rate of the spinneret and stabilize the spinning.
Spinning Temperature
Properly increase the melt spinning temperature to improve the rheological properties of the melt. When our factory produces 222dtex/96f natural polyester DTY, the melt temperature is about 5 ℃ higher than that of conventional varieties, reaching 290 ℃.
Cool Down
Due to the large fiber fineness and a large number of fibers, it is necessary to increase the air volume of the side blowing, the wind speed is increased to 0.80 ± 0.02 m/s, the humidity of the side blowing is stable at 75 ± 5%, and the oiling position of the bundle is increased. Strengthen the cooling effect of the thread, stabilize the solidification of the thread, and reduce the unevenness of polyester POY.
Oil
Clean and replace the oil pump in time to ensure the oil content and uniformity of polyester POY and enhance the cohesion of the tow.
POY Quality
When producing 222 dtex/96 f polyester DTY, the quality index of polyester POY is required as shown in Table 2.
| Table 2 Polyester POY quality index when producing 222 dtex / 96f polyester DTY |
| Fineness (dtex) | 335 | Oil content (%) | 0.36 |
| Intensity (cN/dtex) | 229 | Evenness rate (%) | 1.27 |
| elongation(%) | 119.37 | Boiling water shrinkage (%) | 67.43 |
Polyester POY Manufacturer - Salud Style
Our polyester yarn factory has a construction area of 195,000 square meters. The main products are polyester drawn textured yarn (DTY), polyester pre-oriented yarn (POY) and polyester fully drawn yarn (FDY) of various specifications and colors. The production capacity is more than 100,000 tons, of which the annual output of polyester POY is 3,000 tons, and the total production and sales have exceeded 1 billion yuan since 2003. The company has strong strength and strict management, and regards product quality as the first life of the enterprise.
