Differentiated modified polyester fiber production method capable of adding functional powder on line

Abstract

The invention relates to the technical field of fiber manufacturing, and discloses a differential modified polyester fiber production method capable of adding functional powder on line, which comprises the following steps: treating raw material melt, conveying polyester melt to a melt filter through a melt conveying pump to filter impurities, metering through a melt metering pump, outputting in two paths, premixing the functional powder, and drying to obtain the differential modified polyester fiber. Conveying the functional modified pre-melt to a dynamic mixer through a third melt metering pump for secondary mixing, and distributing the functional modified pre-melt to a static mixer through a melt three-way valve for tertiary mixing; after being mixed for the third time through the static mixer, the melts obtained after three times of mixing are accurately metered through a box metering pump and conveyed to a corresponding spinning box, spinning forming of the melts is conducted, the mixing proportion of the basic melts and the functional modified melts is adjusted in real time through cooperative control of a melt three-way valve and a three-stage metering pump, and the functional modified melts are obtained. Production switching can be achieved without shutdown, and powder with different functions can be directly added on line through on-line proportion regulation and dynamic mixing.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber manufacturing, and in particular to a method for producing differentially modified polyester fibers by adding functional powder online. Background Art

[0002] The existing polyester fiber production method is mainly used to make ordinary polyester fibers from polyester melts through melt spinning, which are widely used in textile clothing, home textile fabrics, industrial fabrics (such as geotextiles, filter materials) and other fields. It usually adopts a single process of "polyester melt filtration → metering → direct spinning", and the functions of the produced fibers are relatively simple. In order to meet market demand, polyester differentiated modified fibers all use functional masterbatches to add functional masterbatches in the pre-spinning to achieve the modification of polyester products. The use of functional masterbatches will increase production costs. During the generation and use of masterbatches, the carrier of the functional masterbatch will increase multiple thermal histories, causing the viscosity of the masterbatch to drop significantly, further affecting the characteristics of the final product.

[0003] However, if the existing differentiated modified polyester fiber method adds functional powder during the spinning stage, simple screw mixing or single static mixing is usually used, which cannot effectively break up the powder agglomerates. If the fiber function needs to be changed, such as from antistatic to flame retardant, it is usually necessary to shut down and replace the entire ingredient system, or pre-add functional ingredients during the polymerization stage, and it is impossible to make real-time adjustments during the production process. If the masterbatch addition method is used, masterbatches with different functions need to be prepared in advance, and the residual material in the extruder needs to be emptied when changing products. The downtime is as long as 4-8 hours, and it is impossible to produce multiple functional fibers on the same production line at the same time.

[0004] Therefore, it is necessary to provide a differentiated modified polyester fiber production method with online addition of functional powder to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a technical solution to solve the problems in the prior art raised in the above background technology.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for producing differentially modified polyester fibers by adding functional powder online comprises the following steps:

[0008] S1, processing of raw material melt, polyester melt is transported to melt filter by melt delivery pump to filter impurities, and then metered by melt metering pump and output in two ways;

[0009] S2, pre-mixing of functional powders: After being measured by loss-in-weight scale from the silo, the functional powders enter the screw pump and are mixed with the melt delivered by the melt metering pump 2 to form a functional modified pre-melt;

[0010] S3, homogenization of the melt, the functional modified pre-melt is transported to the dynamic mixer by the melt metering pump for secondary mixing, and then distributed to the static mixer through the melt three-way valve for tertiary mixing;

[0011] S4, distribution and metering of the melt, after the three mixing, the melt is respectively mixed for the third time in the static mixer, accurately metered by the box metering pump, and transported to the corresponding spinning box;

[0012] S5, spinning the melt into a fiber, wherein the spinning manifold receives the melt and completes spinning to obtain differentially modified polyester fibers.

[0013] Preferably, the polyester melt enters the melt delivery pump through the feed port of the melt delivery pump, the outlet of the melt delivery pump is connected to the inlet of the melt filter through a pipeline, and the outlet of the melt filter is connected to the inlet of the melt metering pump.

[0014] Preferably, the outlet of the melt metering pump 1 is connected to the inlet of the melt metering pump 2, the outlet of the melt metering pump 2 is connected to the inlet of the screw pump, and the silo is connected to the inlet of the screw pump after being measured by a loss-in-weight scale.

[0015] Preferably, the screw pump includes a first screw pump and a second screw pump, the outlet of the first screw pump is connected to the inlet of the second screw pump, the inlet of the first screw pump is connected to the outlet of the loss-in-weight scale, and the outlet of the second melt metering pump is connected to the inlet of the second screw pump.

[0016] Preferably, the outlet of the second screw pump is communicated with the inlet of the melt metering pump three, the outlet of the melt metering pump three is communicated with the inlet of the dynamic mixer, and the outlet of the dynamic mixer is communicated with the first inlet of the three-way valve.

[0017] Preferably, the second outlet of the melt metering pump is connected to the second inlet of the three-way valve, and the outlet of the three-way valve is connected to the feed of the static mixer. There are three static mixers, including static mixer one, static mixer two and static mixer three, and the outlet of the three-way valve is connected to the inlets of static mixer one, static mixer two and static mixer three respectively.

[0018] Preferably, there are three box metering pumps, including box metering pump one, box metering pump two and box metering pump three. The inlet of box metering pump one is connected to the outlet of static mixer one, the inlet of box metering pump two is connected to the outlet of static mixer two, and the box metering pump three is connected to the outlet of static mixer three.

[0019] Preferably, three groups of spinning manifolds are provided, and the inlets of the three groups of spinning manifolds are respectively connected to the outlets of the first, second and third box metering pumps.

[0020] Preferably, the mass concentration of the functional modified premelt in S2 is 15-35%.

[0021] Preferably, the melt three-way valve realizes the production of differentiated polyester fibers by adjusting the mixing ratio of the basic melt and the functional modified melt, and the mixing ratio ranges from 1:9 to 9:1.

[0022] Technical effects and advantages of the present invention: The method for producing differentiated modified polyester fibers by adding functional powder online proposed by the present invention has the following advantages over the prior art:

[0023] 1. The present invention uses a dynamic mixer in conjunction with three parallel static mixers to perform laminar mixing, ultimately reducing the concentration variation coefficient of the functional components in the melt to below 1%. This effectively solves the problem of fiber performance fluctuation caused by powder agglomeration in traditional processes, while also avoiding blockage of the spinneret due to powder agglomeration, significantly improving production stability and efficiency.

[0024] 2. The present invention can adjust the mixing ratio of the basic melt and the functional modified melt in real time within the range of 1:9 to 9:1 through the coordinated control of the melt three-way valve and the three-stage metering pump. At the same time, the three parallel static mixers and the box metering pump branch support independent regulation. The mixing ratio is switched by the three-way valve, and production switching can be achieved without shutting down. Through online ratio control and dynamic mixing, different functional powders can be directly added online, avoiding the masterbatch preparation link, effectively solving the technical problems of poor production flexibility and inability to adjust in real time in traditional processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a system flow chart of a method for producing differentiated modified polyester fibers by adding functional powder online according to the present invention.

[0026] In the picture:

[0027] 1. Melt delivery pump; 2. Melt filter; 3. Melt metering pump 1; 4. Melt metering pump 2; 5. Silo; 6. Loss-in-weight scale; 7. Screw pump; 8. Melt metering pump 3; 9. Dynamic mixer; 10. Static mixer 1; 11. Static mixer 2; 12. Static mixer 3; 13. Box metering pump 1; 14. Box metering pump 2; 15. Box metering pump 3; 16. Melt three-way valve. DETAILED DESCRIPTION

[0028] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. Furthermore, features described for some examples may be combined in other examples.

[0029] The invention provides Figure 1 As shown, a method for producing differentially modified polyester fibers by adding functional powder online comprises the following steps:

[0030] S1, processing of raw material melt, polyester melt enters melt delivery pump 1 through the feed port of melt delivery pump 1, the outlet of melt delivery pump 1 is connected to the inlet of melt filter through a pipeline, and the outlet of melt filter is connected to the inlet of melt metering pump 3;

[0031] The polyester melt is delivered to the melt filter 2 by the melt delivery pump 1 for impurities to be filtered, and then metered by the melt metering pump and output in two ways. Specifically, the melt delivery pump 1 provides stable pressure to drive the polyester melt to flow by rotating the pump body or reciprocating motion, ensuring that the melt enters the filter at a set flow rate, such as 50-200 kg / h, to avoid spinning end breakage due to pressure fluctuations. The melt filter 2 uses a candle filter element or a laminated filter element to remove impurities in the melt through physical interception, such as titanium dioxide particles and gel particles, to prevent impurities from clogging the spinneret micropores, thereby improving fiber strength and surface smoothness.

[0032] The melt metering pump 1 3 is transported to the melt metering pump 2 44 to participate in functional modification, and the other is directly transported to the three-way valve 16 as the basic melt. The content of functional components in the final product is controlled by adjusting the ratio of the two channels;

[0033] S2, pre-mixing of functional powders, the outlet of melt metering pump 1 3 is connected to the inlet of melt metering pump 2 4, the outlet of melt metering pump 2 4 is connected to the inlet of screw pump 7, the silo 5 is connected to the inlet of screw pump 7 after being measured by loss-in-weight scale 6, the screw pump 7 includes a first screw pump 7 and a second screw pump 7, the outlet of the first screw pump 7 is connected to the inlet of the second screw pump 7, the inlet of the first screw pump 7 is connected to the outlet of loss-in-weight scale 6, and the outlet of melt metering pump 2 4 is connected to the inlet of the second screw pump 7;

[0034] After being measured by the loss-in-weight scale 6 from the silo 5, the functional powder enters the screw pump 7 and is mixed with the melt delivered by the melt metering pump 2 4 to form a functional modified premelt with a mass concentration of 15-35%. The loss-in-weight scale 6 is based on a dynamic weighing sensor to monitor the powder reduction in real time and adjust the feeding speed to ensure that the powder addition amount fluctuates less than ±0.3%, avoiding fluctuations in fiber properties due to unstable powder amount. The screw pump 7 evenly wraps the powder in the melt to form an initially mixed functional modified premelt, laying the foundation for subsequent homogenization.

[0035] S3, homogenization of the melt, the outlet of the second screw pump 7 is connected to the inlet of the melt metering pump 3 8, the outlet of the melt metering pump 3 8 is connected to the inlet of the dynamic mixer 9, and the outlet of the dynamic mixer 9 is connected to the first inlet of the three-way valve;

[0036] Among them, the second outlet of the melt metering pump 3 is connected to the second inlet of the three-way valve, and the outlet of the three-way valve is connected to the feed of the static mixer. There are three static mixers, including static mixer 10, static mixer 2 11 and static mixer 3 12. The outlet of the three-way valve is connected to the inlets of static mixer 10, static mixer 2 11 and static mixer 3 12 respectively. The three-way valve distributes the mixed melt to three parallel static mixers, and then transports them to three spinning beams respectively. Each static mixer independently homogenizes the melt of its own branch to ensure that the functional component concentration and temperature distribution of the three melts are completely consistent, avoiding fluctuations in fiber performance due to differences between spinning beams;

[0037] The melt three-way valve 16 achieves the production of differentiated polyester fibers by adjusting the mixing ratio of the basic melt and the functional modified melt, and the mixing ratio ranges from 1:9 to 9:1.

[0038] The functionally modified premelt is delivered to the dynamic mixer 9 via the melt metering pump 3 8 for secondary mixing, and then distributed to the static mixer via the melt three-way valve 16 for tertiary mixing. The melt metering pump 3 8 works in conjunction with the melt metering pump 1 3 and the melt metering pump 2 4 to ensure that the pressure of the modified melt entering the dynamic mixer 9 is stable. The dynamic mixer 9 applies shear force to the melt through rotating elements to break up powder agglomerates. The melt is divided into multiple flow channels by the elements and then re-merges, further refining the powder in the premelt to the submicron level and eliminating concentration gradients.

[0039] The three-way valve adjusts the valve core position through an electric actuator to control the mixing ratio of the base melt + modified melt. For example, a 3:7 ratio is selected when producing antibacterial fibers, and a 7:3 ratio is selected when producing UV-resistant fibers.

[0040] The static mixer eliminates the uneven concentration that may remain in the dynamic mixer 9, so that the functional components can be dispersed at the molecular level in the melt.

[0041] S4, distribution and metering of the melt, three box metering pumps are provided, including box metering pump 13, box metering pump 2 14 and box metering pump 3 15, the inlet of box metering pump 13 is connected to the outlet of static mixer 10, the inlet of box metering pump 2 14 is connected to the outlet of static mixer 2 11, and box metering pump 3 15 is connected to the outlet of static mixer 3 12;

[0042] There are three groups of spinning boxes, and the inlets of the three groups of spinning boxes are respectively connected to the outlets of box metering pump 13, box metering pump 2 14 and box metering pump 3 15.

[0043] The melt after three mixing is mixed in the static mixer for the third time, accurately measured by the box metering pump, and transported to the corresponding spinning box.

[0044] The above describes the embodiments of the present invention, but the present invention is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms under the guidance of the present invention, all of which are protected by the present invention.

Claims

1. A method for producing differentially modified polyester fibers by adding functional powder online, characterized in that: The following steps are involved: S1, processing of raw material melt, polyester melt is transported to melt filter (2) by melt delivery pump (1) to filter impurities, and then metered by melt metering pump and output in two ways; S2, pre-mixing of functional powders, after being measured by loss-in-weight scale (6) from silo (5), functional powders enter screw pump (7) and are mixed with the melt delivered by melt metering pump 2 (4) to form functional modified pre-melt; S3, homogenization of the melt, the functional modified pre-melt is transported to the dynamic mixer (9) through the melt metering pump (8) for secondary mixing, and then distributed to the static mixer through the melt three-way valve (16) for tertiary mixing; S4, distribution and metering of the melt, after the three mixing, the melt is respectively mixed for the third time in the static mixer, accurately metered by the box metering pump, and transported to the corresponding spinning box; S5, spinning the melt into a fiber, wherein the spinning manifold receives the melt and completes spinning to obtain differentially modified polyester fibers.

2. The method for producing differentially modified polyester fibers by adding functional powder online according to claim 1, characterized in that: The polyester melt enters the melt delivery pump (1) through the feed port of the melt delivery pump (1), the outlet of the melt delivery pump (1) is connected to the inlet of the melt filter through a pipeline, and the outlet of the melt filter is connected to the inlet of the melt metering pump (3).

3. The method for producing differentially modified polyester fibers by adding functional powder online according to claim 2, characterized in that: The outlet of the melt metering pump 1 (3) is connected to the inlet of the melt metering pump 2 (4), the outlet of the melt metering pump 2 (4) is connected to the inlet of the screw pump (7), and the silo (5) is connected to the inlet of the screw pump (7) after being measured by the loss-in-weight scale (6).

4. The method for producing differentially modified polyester fibers by adding functional powder online according to claim 3, characterized in that: The screw pump (7) includes a first screw pump (7) and a second screw pump (7), the outlet of the first screw pump (7) is connected to the inlet of the second screw pump (7), the inlet of the first screw pump (7) is connected to the outlet of the loss-in-weight scale (6), and the outlet of the second melt metering pump (4) is connected to the inlet of the second screw pump (7).

5. The method for producing differentially modified polyester fibers by adding functional powder online according to claim 4, characterized in that: The outlet of the second screw pump (7) is connected to the inlet of the melt metering pump (8), the outlet of the melt metering pump (8) is connected to the inlet of the dynamic mixer (9), and the outlet of the dynamic mixer (9) is connected to the first inlet of the three-way valve.

6. The method for producing differentially modified polyester fibers by adding functional powder online according to claim 5, characterized in that: The second outlet of the melt metering pump 1 (3) is connected to the second inlet of the three-way valve, and the outlet of the three-way valve is connected to the feed of the static mixer. There are three static mixers, including static mixer 1 (10), static mixer 2 (11) and static mixer 3 (12). The outlet of the three-way valve is connected to the inlet of static mixer 1 (10), static mixer 2 (11) and static mixer 3 (12) respectively.

7. The method for producing differentially modified polyester fibers by adding functional powder online according to claim 6, characterized in that: There are three box metering pumps, including box metering pump one (13), box metering pump two (14) and box metering pump three (15). The inlet of box metering pump one (13) is connected to the outlet of static mixer one (10), the inlet of box metering pump two (14) is connected to the outlet of static mixer two (11), and the box metering pump three (15) is connected to the outlet of static mixer three (12).

8. The method for producing differentially modified polyester fibers by adding functional powder online according to claim 7, characterized in that: The spinning manifolds are provided with three groups, and the inlets of the three groups of spinning manifolds are respectively connected to the outlets of the first manifold metering pump (13), the second manifold metering pump (14) and the third manifold metering pump (15).

9. The method for producing differentially modified polyester fibers by adding functional powder online according to claim 1, characterized in that: The mass concentration of the functional modified premelt in S2 is 15-35%.

10. The method for producing differentially modified polyester fibers by adding functional powder online according to claim 6, characterized in that: The melt three-way valve (16) realizes the production of differentiated polyester fibers by adjusting the mixing ratio of the basic melt and the functional modified melt, and the mixing ratio ranges from 1:9 to 9:1.

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