CN101210772A

CN101210772A - PTT slicing drying method for PTT/PET composite full drafting low-elasticity network thread

Info

Publication number: CN101210772A
Application number: CNA2006101560701A
Authority: CN
Inventors: 陈林; 费祥; 蒋守明; 王成
Original assignee: JIANGSU ZHENYANG CO Ltd
Current assignee: JIANGSU ZHENYANG CO Ltd
Priority date: 2006-12-30
Filing date: 2006-12-30
Publication date: 2008-07-02

Abstract

The invention relates to a method for drying a PTT slice of a PTT/PET composite full-tension low-elasticity interlaced yarn. The invention is characterized in that the PTT slice is dried by the following steps of: 1) sorting: the PTT slice is fed, in order, through a storage hopper, an oscillating screen, a pulse generator and another storage hopper; 2) pre-crystallization: the PTT slice is fed, in order, through a shaking feeder, a fluidized bed and a drying tower, and then kept in a fluidized bed pre-crystallizer for 5-15 minutes to allow the pre-crystallization to be finished; 3) drying: the PTT slice is dried with high-temperature dried air for 4-6 hours until the water content of the uniformly-crystallized PTT slice meets the standard. The inventive drying method ensures the uniform crystallization and normal color shade of the PTT dried slice and avoids the yellowing and deterioration problems. The water content of the slice is below 50ppm, which meets the technological requirements for drying PTT-POY pre-oriented yarns as well as PET composite spinning. The spinning of PTT dried slice is stable without filament drift.

Description

PTT slicing drying method in the PTT/PET composite full drafting low elastic interlaced yarn

Technical field:

The present invention relates to the drying process in a kind of polymer spinning process, especially a kind of PTT/PET composite full drafting low elastic interlaced yarn PTT slicing drying method.

Background technology:

PTT is a PTT, is a kind of novel macromolecular material, and it has overcome the rigidity of PET and the flexibility of PBT fiber, and the fiber of producing with PTT has many special performances such as excellent resilience and easy dyeing.But, because its pre-crystallization temperature is 40 ℃, being easy to crystallization, the stability, uniformity of the crystallization of PTT section simultaneously is relatively poor, and the temperature and time of crystallization is wayward.At present, the home and abroad does not also have the clear and definite drying technique introduction with PTT section production POY.

Summary of the invention

The object of the present invention is to provide a kind of PTT of the making section can the stable and uniform crystallization, the moisture content of cutting into slices after the PTT drying is controlled at below the 50ppm, the production drying process that satisfies the PTT-POY preoriented yarn requires and satisfies and the requirement of PET composite spinning.

For achieving the above object, the technical solution adopted in the present invention is: the PTT slicing drying method in the PTT/PET composite full drafting low elastic interlaced yarn, and wherein: PET adopts the drying means when producing polyamide composite filaments, and following drying means is then adopted in the PTT section:

The first step, screening: the PTT raw material of cutting into slices is knocked down feed bin, open the gauge tap of feed bin bottom, PTT section raw material enters vibratory sieve continually, enters impulse generator through garbled PTT section raw material, and the different shape PTT section by sieve does not flow to collecting vessel; Enter the PTT section raw material of impulse generator, under the acting in conjunction of compressed air and impulse generator, another feed bin is sent in the PTT section;

Second step, pre-crystallization: the PTT section raw material in the feed bin, under the effect of deadweight, enter into oscillating feeder by the set charging valve port in feed bin bottom, on oscillating feeder lower tube road junction, be provided with the inlet amount control valve, by set pipeline fluid bed sent in the PTT section by the feed quantity that control valve is set; Fluid bed is located at the middle and upper part of drying tower, fluid bed is provided with suitable for reading with the inner chamber that communicates altogether with drying tower, fluid bed is provided with two row baffle plates, be provided with weir plate between fluid bed and the drying tower exit, its weir plate cuts from end root, it is crooked in drying tower with the weir plate bottom behind the 6-10cm to make progress from the bottom, and is 20 ° of-60 ° of flangings between the hole face of being opened and forms deflectors; On the set pipeline in fluid bed bottom, be furnished with primary heater, drain valve, the blower fan port of export successively, blower fan entrance point, filter, cyclone separator, suitable for reading being connected of inner chamber that the set pipeline in the top of cyclone separator is common with fluid bed and drying tower; After the PTT section enters fluid bed, under 40 ℃ thermal cycle wind action, be complete fluidized state and realize pre-crystallization treatment; The PTT section is turned over into secondary series baffle plate from the first row plate washer on fluid bed under the wind-force effect of thermal cycle wind, after turning over into the weir plate shelves from the secondary series baffle plate again, in the bottom hole of weir plate or enter drying tower from its upper end, the PTT section is stopped in the fluid bed pre-crystallizer finished crystallization process in 5-15 minute respectively;

In the 3rd step, drying: the bottom of drying tower is made as the reverse taper formula, is furnished with the port of export of secondary heater on the set pipeline opening in one side, bottom of drying tower, and the entrance point of secondary heater inserts the dry air inlet; Be lower than-50---70 ℃, temperature: 115-145 ℃ flow: 150-200m by dew point ³The high temperature drying air of/h is blown into from the bottom of drying tower, the reverse from bottom to up section post of blowing over, and through after 4-6 hour the drying, the moisture content of the uniform PTT section of crystallization is up to standard, and doing from the bottom of drying tower cuts into slices to export to discharge enters next procedure.

Beneficial effect of the present invention:

1, pre-crystallization mode of the present invention, it is disconnected from each other not only to make PTT do section, also because of cutting into slices at high-speed motion, the surperficial heat that produces in the section is drained rapidly, prevented the bonding of section effectively, do not have mechanical agitation simultaneously, reduced damage and consequent dust, so more superior than other pre-crystallization mode to section;

2, it is even that PTT does the section crystallization, and form and aspect are normal, not the phenomenon of jaundice degraded; The section moisture content is below the 50ppm, has satisfied the production drying process requirement of PTT-POY preoriented yarn, and the requirement of satisfied and PET composite spinning;

3, PTT does the phenomenon of the stable silk that do not waft of slice spinning.

Description of drawings:

Fig. 1 is drying process figure of the present invention.

The specific embodiment:

Describe the present invention in detail below in conjunction with accompanying drawing:

As shown in Figure 1, the PTT slicing drying method in the PTT/PET composite full drafting low elastic interlaced yarn, wherein: PET adopts the drying means when producing polyamide composite filaments, and following drying means is adopted in the PTT section:

The first step: screening: the PTT raw material of cutting into slices is knocked down feed bin 1, open the gauge tap of feed bin 1 bottom, PTT section raw material enters vibratory sieve 2 continually, enters impulse generator 4 through garbled PTT section raw material, and the different shape PTT section by sieve does not flow to collecting vessel 3; Enter the PTT section raw material of impulse generator 4, under the acting in conjunction of compressed air and impulse generator 4, PTT section raw material is sent into another feed bin 5;

Second step, pre-crystallization: the PTT section raw material in the feed bin 5, under the effect of deadweight, the charging valve port set by feed bin 5 bottoms enters into oscillating feeder 7, on oscillating feeder 7 lower tube road junctions, be provided with the inlet amount control valve, by set pipeline fluid bed 8 sent in the PTT section by the feed quantity that control valve is set; Fluid bed 8 is located at the middle and upper part of drying tower 16, and fluid bed 8 and drying tower 16 are provided with suitable for reading with the inner chamber that communicates altogether, and fluid bed 8 is provided with two row baffle plates, and baffle plate can be guaranteed section at high-speed motion simultaneously, and makes section in the 8 last time of staying of fluid bed unanimity.Be provided with weir plate between fluid bed 8 and drying tower 16 exits, its weir plate cuts from end root, and it is crooked to drying tower 16 in the weir plate bottom behind the 7cm to make progress from the bottom, and is 45 ° of flangings formation deflectors between the hole face of being opened.The throughput of PTT section can be suitably improved in this hole on the one hand, reduces the time of staying of pre-crystallization, on the other hand, makes the PTT pre-crystallization of cutting into slices more even.On the set pipeline in fluid bed 8 bottoms, are furnished with primary heater 13, drain valve 12, blower fan 11 ports of export successively, blower fan 11 entrance points, filter 10, cyclone separator 9, suitable for reading being connected of inner chamber that the set pipeline in the top of cyclone separator 9 and fluid bed 8 and drying tower 16 are common; When blower fan 11, primary heater 13 work, the hot blast that produces upwards blows from fluid bed 8 belows by pipeline, every PTT cuts into slices so high-speed motion on fluid bed 8, hot-air continues behind fluid bed 8 upwards, this moment hot-air and be mingled with dust and be input to cyclone separating tower 9 by pipeline from the common inner chamber of fluid bed 8 and drying tower 16 is suitable for reading, most dust falls in the cyclone separating tower 9, do not separate clean small amount of dust in addition and discharge through the pipeline of cyclone separating tower 9 upper outlets with hot-air and be transported to the entrance point of blower fan 11 by pipeline after device after filtration 10 filters, the waste heat amount continues to recycle like this.If the temperature of thermal cycle wind is too high, can emit to reach the purpose of temperature adjustment by drain valve 12.After the PTT section enters fluid bed 8, under 40 ℃ thermal cycle wind action, be complete fluidized state and realize pre-crystallization treatment; The PTT section is turned over into secondary series baffle plate from the first row plate washer on fluid bed 8 under the wind-force effect of thermal cycle wind, after turning over into the weir plate shelves from the secondary series baffle plate again, in the bottom hole of weir plate or enter drying tower 16 from its upper end, the PTT section is stopped in fluid bed 8 pre-crystallizers finished crystallization process in 8 minutes respectively;

In the 3rd step, drying: the bottom of drying tower 16 is made as the reverse taper formula, makes to cut into slices within it that the chamber forms stable plug flow, guarantees the first in first out of cutting into slices, and last-in, last-out makes time of staying unanimity.The port of export of being furnished with secondary heater 15 on the set pipeline opening in one side, bottom of drying tower 16, the entrance point of secondary heater 15 insert the dry air inlet; By dew point is-70 ℃, temperature: 130 ℃, and flow: 160m ³The high temperature drying air of/h is blown into from the bottom of drying tower 16, the reverse from bottom to up section post of blowing over, through dried section in 4.5 hours, after testing: crystallization is more even, the section moisture content is 45ppm, satisfied the production drying process requirement of PTT-POY preoriented yarn, and the requirement of satisfied and PET composite spinning.The PTT section can be done section outlet (18) discharge from the bottom of drying tower (16) and enter next procedure.

Claims

1. the PTT slicing drying method in the PTT/PET composite full drafting low elastic interlaced yarn, wherein: PET adopts the drying means when producing polyamide composite filaments, it is characterized in that: following drying means is adopted in the PTT section:

The first step, screening: the PTT raw material of cutting into slices is knocked down feed bin (1), open the gauge tap of feed bin (1) bottom, PTT section raw material enters vibratory sieve (2) continually, enter impulse generator (4) through garbled PTT section raw material, the different shape PTT section by sieve does not flow to collecting vessel (3); Enter the PTT section raw material of impulse generator (4), under the acting in conjunction of compressed air and impulse generator (4), PTT section raw material is sent into another feed bin (5);

The second pre-crystallization of step: the PTT section raw material in the feed bin (5), under the effect of deadweight, enter into oscillating feeder (7) by the set charging valve port in feed bin (5) bottom, on oscillating feeder (7) lower tube road junction, be provided with the inlet amount control valve, by set pipeline fluid bed (8) sent in the PTT section by the feed quantity that control valve is set; Fluid bed (8) is located at the middle and upper part of drying tower (16), fluid bed (8) is provided with suitable for reading with the inner chamber that communicates altogether with drying tower (16), fluid bed (8) is provided with two row baffle plates, be provided with weir plate between fluid bed (8) and drying tower (16) exit, its weir plate cuts from end root, it is crooked to drying tower (16) in the weir plate bottom behind the 6-10cm to make progress from the bottom, and is 20 ° of-60 ° of flangings formation deflectors between the hole face of being opened; On the set pipeline in fluid bed (8) bottom, be furnished with primary heater (13), drain valve (12), blower fan (11) port of export successively, blower fan (11) entrance point, filter (10), cyclone separator (9), suitable for reading being connected of inner chamber that the set pipeline in top of cyclone separator (9) is common with fluid bed (8) and drying tower (16); After the PTT section enters fluid bed (8), under 40 ℃ thermal cycle wind action, be complete fluidized state and realize pre-crystallization treatment; The PTT section is upward turned over into secondary series baffle plate from the first row plate washer at fluid bed (8) under the wind-force effect of thermal cycle wind, after turning over into the weir plate shelves from the secondary series baffle plate again, in the bottom hole of weir plate or enter drying tower (16) from its upper end, make PTT section stop fluid bed (8) pre-crystallizer in finish crystallization process in 5-15 minute respectively;

The 3rd step is dry: the bottom of drying tower (16) is made as the reverse taper formula, is furnished with the port of export of secondary heater (15) on the set pipeline opening in one side, bottom of drying tower (16), and the entrance point of secondary heater (15) inserts the dry air inlet; Be lower than-50---70 ℃, temperature: 115-145 ℃ flow: 150-200m by dew point ³The high temperature drying air of/h is blown into from the bottom of drying tower (16), the reverse from bottom to up section post of blowing over, through after 4-6 hour the drying, the moisture content of the uniform PTT section of crystallization is up to standard, discharges from the dried section outlet in bottom (18) of drying tower (16) and enters next procedure.