Process for making stable polytrimethylene terephthalate packages
A polytrimethylene terephthalate, polyester yarn technology, applied in the direction of single-component polyester rayon, textile and papermaking, rayon heat treatment, etc., can solve the problem of long-term stability decline of yarn package, Problems such as increasing the spinning speed of multifilament yarns
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Embodiment 1
[0051] Table 1 below gives details of the extrusion, spinning and winding operating conditions. The extruder in this case was a general purpose screw extruder with an aspect ratio of 24 and pin type mixing at the end of the extruder. This type of extruder provides acceptable mixing for polyester spinning.
[0052] Material
type
unit
PTT
ppm
＜30
IV
0.92
extruder
type
4E4 (Barmag)
Section 1
℃
250 or 245
Section 2
℃
255 or 250
Section 3
℃
260 or 255
section 4
℃
260 or 255
Measuring head
pressure
bar
100
temperature
℃
257 or 253
spinneret
type
SP50
Recover
mm
40
Dow heat carrier
Boiler
℃
260 or 255
spinning pump
capacity
ccm
2.4
rpm
l / min
11.75
Melt pressure
forward
bar
...
Embodiment 2
[0063] In this set of experiments, the second godet pair was heated. A spinning speed of 2750 meters per minute (m / min) was used in order to obtain 100% elongation. The main variables in this example are the temperature of the godet and the number of wraps (of the yarn around the godet). Table 3 details the various variables and the results obtained. A very important observation from the data is that PTT has excellent package formation when the winding tension is very low, about 0.01 to 0.02 g / denier. Also, shrinkage measurements show that at reasonable temperatures, a minimum of 3.5 cycles would be required to reduce the shrinkage to close to zero.
[0064] In the temperature range of 100°C to 110°C, increasing the number of turns to 5.5 or 7.5 gives very low shrinkage. The results show that at 2750 m / min, the process route using the heated godet reduces the shrinkage by about 8-10% compared to the process without the heated godet. When the temperature or the number of wi...
Embodiment 3
[0068] In this example, the first godet pair was heated while the second godet pair was kept at room temperature. The winding speed was set at 2600 m / min in order to obtain a slightly higher elongation compared to the spinning speed of 2750 m / min. Additionally, an intermingling device is placed prior to the first godet pair to increase fiber integrity during storage and further processing.
[0069] Table 4 lists details of the parameters used and the results obtained in this example. These results show that similar results are obtained when the first pair of godet rolls is heated as the second pair of godet rolls are heated. Godet temperatures between 90 and 100°C lead to a marked reduction in shrinkage. The decrease in elongation and strength in this case is much smaller than heating the second godet pair. On the other hand, the Uster value increases more in the temperature range in which the shrinkage rate is substantially reduced.
[0070] roll 1
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