CN102134756B - Method for controlling homogeneity of fluorescent-whitened polyester staple fiber product - Google Patents
Method for controlling homogeneity of fluorescent-whitened polyester staple fiber product Download PDFInfo
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- CN102134756B CN102134756B CN2011100699544A CN201110069954A CN102134756B CN 102134756 B CN102134756 B CN 102134756B CN 2011100699544 A CN2011100699544 A CN 2011100699544A CN 201110069954 A CN201110069954 A CN 201110069954A CN 102134756 B CN102134756 B CN 102134756B
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Abstract
The invention relates to a method for controlling homogeneity of a fluorescent-whitened polyester staple fiber product, which comprises the following process procedures of fusing and extruding a PBT (polybutylece terephthalate) fluorescent-whitening master batch by a screw extruder, quantitatively adding the extrudate to a PET (Positron Emission Tomography) fusant of a normal PET production and delivery pipeline through a first metering pump and a master batch fusant pipeline, pressurizing the extrudate through a booster pump to lead the extrudate to enter a fusant cooler to be cooled to normal spinning temperature, then leading the cooled extrudate to enter the fusant pipeline, mixing the extrudate through a static mixer to make the extrudate into a blending fusant of the PBT fluorescent-whitening master batch and PET, leading the blending fusant to enter a spinning box, metering the blending fusant by a second metering pump, leading the blending fusant to enter a spinning component for spinning, cooling and oiling spun silks, and dragging the spun silks by a dragging roller and a sunflower wheel to be sent into a silk holding barrel. The rotation speed of the booster pump and the first metering pump adopts signal interlock control; the master batch fusant pipeline and the first metering pump are respectively provided with a heat tracing temperature control system; and heat tracing media of the heat tracing temperature control systems adopt the primary heating medium series control of a heat tracing temperature control system of a normal PET fusant pipeline. By the control method, the addition proportion of a fluorescent whitening ingredient can be ensured to be a set value when production capacity is changed.
Description
Technical field
The present invention relates to a kind of control method of fluorescent brightening terylene short fiber product homogeneity.Belong to the chemical fibre technical field.
Background technology
The fluorescent brightening terylene short fiber be the ordinary polyester short fiber in process of production, add the fluorescent brightening composition, the lasting fluorescent functional of endowing terylene short fiber.Product is widely used in reflectorized material, textile garment field.Because of the fluorescent brightening composition directly influences product appearance and properties of product, so the fluorescent brightening terylene short fiber is had relatively high expectations to the homogeneity of product.
At present general manufacturer production fluorescent brightening terylene short fiber; The main direct fusion fluorescent brightening of the screw rod master batch that uses; Extruding gets into melt pipe, or increases the quantitative a certain proportion of section master batch (like Fig. 1) that adds of measuring pump realization, makes the fluorescent brightening composition of product reach certain content.But in the actual production process; (spinnerets is after use a period of time because of spinning needs regularly or irregularly to repair the plate operation; Sublimate and the aging thing of silicone oil that polyester oligomer is arranged because of the plate face; Influence spinnerets and peel off effect, spinning before causing has easy formation fault such as lumps, fracture of wire product in the precursor) and maintenance activity etc., melt pressure and production capacity variation in the production caused.And the direct extruding of screw rod receives the external pressure variable effect; The amount of clamp-oning generation non-quantitative changes; Measuring pump quantitatively adds because of not adjusting synchronously with change of production; Final adding proportion also can change, and causes the fluorescent brightening composition skewness of final products, causes deviation on product appearance whiteness and the physical property and irregular.The product homogeneity is poor.
In addition, the general producer of fluorescent brightening master batch uses PET (PET) as base-material, joins in the normal PET melt; But PET is originally as macromolecular compound, and molecular weight is big, molecular chain length; Dispersed relatively poor; And because of the fusion again of cutting into slices, temperature control and viscosity change all can influence the melt rheological property ability, influences the dispersive property of fluorescent brightening effective ingredient.So when the fluorescent brightening master batch adds, add master batch and contain fluorescent brightening effective ingredient ratio and stability, add the master batch amount, use screw rod, measuring pump specification, all can the homogeneity of final products be exerted an influence.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, provide a kind of when guaranteeing that production capacity changes fluorescent brightening composition additional proportion still be the control method of the fluorescent brightening terylene short fiber product homogeneity of setting value.
The objective of the invention is to realize like this: a kind of control method of fluorescent brightening terylene short fiber product homogeneity; It is characterized in that: said method comprises following technical process: PBT fluorescent brightening master batch melt extrudes through screw extruder, gets PBT fluorescent brightening master batch melt, and this PBT fluorescent brightening master batch melt quantitatively adds in the PET melt of normal PET production feed-line through first measuring pump and master batch melt pipeline; After being cooled to normal spinning temperature, melt cooler gets into the melt pipe road through getting into after the booster pump supercharging; Static mixer mixes on the melt pipeline, processes the blend melt of PBT fluorescent brightening master batch and PET, and blend melt gets into manifold; Measure by second measuring pump; Get into the filament spinning component spinning, spun silk is sent into fiber barrel by carry-over pinch rolls and the traction of sunflower wheel after cooling oils;
The said booster pump rotating speed and the first measuring pump rotating speed are made interlocking of signals control, make the first measuring pump rotating speed and booster pump speed realize Synchronization Control through frequency converter in proportion;
The mass percent that the addition of said PBT fluorescent brightening master batch accounts for terylene short fiber is 1% ± 0.2%;
The said master batch melt pipeline and first measuring pump are equipped with the hot temperature control system of companion, and this accompanies companion's thermal medium of hot temperature control system to adopt normal PET to produce the primary fluid series connection control of the hot temperature control system of companion of feed-line.
The inventive method has mainly been improved fluorescent brightening master batch base-material, temperature control tracing system and interlocking of signals control.The invention has the beneficial effects as follows:
1, use the measuring pump interlocking, PBT fluorescent brightening master batch additional proportion still is setting value when guaranteeing the variation of terylene short fiber production capacity
Use the measuring pump addition manner; Avoid changing the PBT fluorescent brightening master batch addition instability that produces because of pressure; But the terylene short fiber production capacity is a dynamic variable quantity in the production process; How to guarantee that when the terylene short fiber production capacity changes PBT fluorescent brightening master batch adding proportion still is consistent, and is the problem that faces in the enterprise practical production.The present invention makes interlocking of signals control with booster pump rotating speed and measuring pump rotating speed, and booster pump rotating speed and measuring pump rotating speed are complementary, and when being 30r/min like the booster pump rotating speed, the measuring pump rotating speed is 20r/min.Booster pump changes because of the spinning off-position causes the terylene short fiber production capacity, and when rotating speed was kept to 27r/min, the automatic interlock of measuring pump rotating speed was adjusted into 18r/m.With the booster pump rotating speed is benchmark adjustment measuring pump rotating speed, and because of booster pump and measuring pump are positive displacement pump, under rotating speed one stable condition, output is stable, thus the stable and consistent property of realization PBT fluorescent brightening master batch adding proportion when the dynamic change of terylene short fiber production capacity.
2, add PBT fluorescent brightening master batch proportions constant, guarantee to add in the terylene short fiber fluorescent brightening effective ingredient proportions constant.
For avoiding PBT fluorescent brightening master batch addition big, in PBT fluorescent brightening master batch, add the instability that common PET half delustring section influences the fluorescent brightening effective ingredient usually, the present invention 100% selects for use the fluorescent brightening master batch to add; Avoid irregular with regard to the distribution that exists in the raw material, other considers the dispersed and distributed situation after the fluorescent brightening master batch adds, and the present invention selects the master batch of moderate addition and proper proportion content for use; Because of considering to produce other kinds, the screw rod surplus of selecting for use is bigger like some enterprise, and the master batch addition reaches 5%-10%; Even about 30%; And all select master batch for use, production cost is higher, therefore in master batch, adds common PET half delustring section; And the solid mixed proportion is difficult to reach consistent, the instability of master batch content in the time of can causing input.Also there is enterprise to use less screw rod to add the master batch of high-load; That have even only add the master batch about 0.3% and reduce production costs; Also can be because of the final distribution of fluorescent brightening effective ingredient in the subsequent allocations homogenize degree affect product; The present invention selects the addition that accounts for terylene short fiber end product quality 1% mass percent fluorescent brightening master batch for use, and the fluorescent brightening master batch that uses 100%, effectively avoids above-mentioned two kinds of extreme cases to occur.
3, fluorescent brightening master batch base-material is selected PBT, improves the dispersive property of fluorescent brightening effective ingredient.
The present invention selects the base-material of PBT (polybutylene terephthalate) as the fluorescent brightening master batch for use.As everyone knows, two kinds of different polyester of PBT and PET can be realized blend, and PBT can effectively be uniformly dispersed in PET; And the more original pure PET of blend material improved crystallization rate and efficient, can realize the better physical stability of product, do not influence the appearance property and the chemical stability of product; The PET intrinsic viscosity there are differences because of normal continuous polymerization polyester PET melt viscosity itself, and cuts into slices when processing master batch again, through the fusion pelletizing; Master batch is in adding melt the time, must dry once more, fusion, and pilot process exists repeatedly viscosity to fall process; The viscosity of final melt is difficult to grasp, if big difference, the little rheological property that then influences in the melt dispersion process take place viscosity; Big then influence the physical and chemical performance of product, production process is caused uncontrollable influence.After the PBT that the present invention uses added fluorescent whitening agent, fusing point was about 245 ℃, and inherent viscosity is about 0.693; 260 ℃ of PET fusing points, inherent viscosity 0.660 is between 285 ~ 290 ℃; The PBT melt can be better than PET melt rheological property, is more conducive to the dispersion of PBT in the PET melt.
4, the homogeneity of melt temperature guarantees that the rheological property of melt and blend distribute
The rheological property of polymer melt in pipeline and device directly influences the stability of terylene short fiber production and the physical and chemical performance of product.And influence melt rheological property can direct factor be the viscosity and the temperature of melt, under the stable situation of inherent viscosity, temperature plays decisive factor to the rheological property of melt.Temperature is low, and melt rheological property can be poor, back poor processability, and viscosity reduces, and the product physical index is good; Temperature is high, and melt rheological property can be good, back good processability, and viscosity raises, and the decline of product physical index is so that temperature is controlled in the spinning production process is particularly important.
Under the circulation good situations, there are not the problems referred to above in system stability during general spinning is produced.But because of adopting the screw rod heating and melting in the fluorescent brightening process of producing product; And the screw rod melting process exists to be sheared and boost in pressure; Temperature rise when comprising through measuring pump, booster pump; All can cause the lifting of melt temperature, make master batch add the PET melt generation temperature difference of the PBT fluorescent brightening master batch melt and the ordinary production feed-line of melt pipeline, cause energy exchange and rheological property to change.Master batch interpolation melt pipeline companion heat and normally companion hot the connect control of PET production feed-line of the present invention after screw rod fusion and the quantitative interpolation of measuring pump; Be used for equilibrium temperature; And because master batch adds the primary fluid series connection control that melt pipeline companion thermal medium adopts normal PET melt pipeline tracing system; The heating agent circulatory system that is the master batch add-on system of primary fluid circulation line and increase is a system; Guarantee that PBT fluorescent brightening master batch melt temperature is consistent with normal PET melt temperature, reduce the influence of temperature melt rheological property ability and viscosity.
More than to efficiently solve PBT fluorescent brightening master batch adding proportion unstable four aspects, melt behind booster pump rapidly by melt cooler to the blend melt cooling and mixing.Fluorescent brightening composition skewness reaches the outward appearance of product, the influence of physical index aspect, realizes the homogeneity of fluorescent brightening production.
Description of drawings
Fig. 1 is the process chart of the control method of fluorescent brightening terylene short fiber product homogeneity in the past.
Fig. 2 is the process chart of the control method of fluorescent brightening terylene short fiber product homogeneity of the present invention.
The specific embodiment
Referring to Fig. 2, Fig. 2 is the process chart of the control method of fluorescent brightening terylene short fiber product homogeneity of the present invention.Can find out by Fig. 2, the control method of fluorescent brightening terylene short fiber product homogeneity of the present invention, said method comprises following technical process:
PBT fluorescent brightening master batch melt extrudes through screw extruder, gets PBT fluorescent brightening master batch melt, and this PBT fluorescent brightening master batch melt quantitatively adds in the PET melt of normal PET production feed-line through first measuring pump and master batch melt pipeline; After the booster pump supercharging, get into melt cooler and be cooled to normal spinning temperature (286-292 ℃) back entering melt pipe road; Static mixer mixes on the melt pipeline, processes the blend melt of PBT fluorescent brightening master batch and PET, and blend melt gets into manifold; Measure by second measuring pump; Get into the filament spinning component spinning, spun silk is sent into fiber barrel by carry-over pinch rolls and the traction of sunflower wheel after cooling oils;
The said booster pump rotating speed and the first measuring pump rotating speed are made interlocking of signals control; Make the first measuring pump rotating speed and booster pump speed realize Synchronization Control through frequency converter in proportion; Concrete ratio value is according to the ratio of the first measuring pump specification, booster pump specification and PBT fluorescent brightening master batch setting additional proportion, that is: (booster pump specification * additional proportion percentage * booster pump gear-box speed reducing ratio) ÷ (the first measuring pump specification * first measuring pump gear-box speed reducing ratio);
The mass percent that the addition of said PBT fluorescent brightening master batch accounts for terylene short fiber is 1% ± 0.2% (deviate adjusts according to user's request); The general content of fluorescent brightening composition in final products is 800 ~ 1400ppm, comes fluorescent brightening composition ratio in PBT fluorescent brightening master batch amount or the master batch that suitably adjustment is added according to required final content.
The said master batch melt pipeline and first measuring pump are equipped with the hot temperature control system of companion, and this accompanies companion's thermal medium of hot temperature control system to adopt normal PET to produce the primary fluid series connection control of the hot temperature control system of companion of feed-line.
Claims (1)
1. the control method of a fluorescent brightening terylene short fiber product homogeneity; It is characterized in that: said method comprises following technical process: PBT fluorescent brightening master batch melt extrudes through screw extruder, gets PBT fluorescent brightening master batch melt, and this PBT fluorescent brightening master batch melt quantitatively adds in the PET melt of normal PET production feed-line through first measuring pump and master batch melt pipeline; After being cooled to normal spinning temperature, melt cooler gets into the melt pipe road through getting into after the booster pump supercharging; Static mixer mixes on the melt pipeline, processes the blend melt of PBT fluorescent brightening master batch and PET, and blend melt gets into manifold; Measure by second measuring pump; Get into the filament spinning component spinning, spun silk is sent into fiber barrel by carry-over pinch rolls and the traction of sunflower wheel after cooling oils;
The said booster pump rotating speed and the first measuring pump rotating speed are made interlocking of signals control, make the first measuring pump rotating speed and booster pump speed realize Synchronization Control through frequency converter in proportion;
The mass percent that the addition of said PBT fluorescent brightening master batch accounts for terylene short fiber is 1% ± 0.2%;
The said master batch melt pipeline and first measuring pump are equipped with the hot temperature control system of companion, the primary fluid series connection control that this accompanies companion's thermal medium of hot temperature control system to adopt normal PET to produce the hot temperature control system of companion of feed-line,
The concrete ratio value of said first measuring pump rotating speed and booster pump speed is according to the ratio of the first measuring pump specification, booster pump specification and PBT fluorescent brightening master batch setting additional proportion, that is: (booster pump specification * additional proportion percentage * booster pump gear-box speed reducing ratio) ÷ (the first measuring pump specification * first measuring pump gear-box speed reducing ratio).
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102650079A (en) * | 2012-03-20 | 2012-08-29 | 桐昆集团浙江恒盛化纤有限公司 | Long-distance conveying method and system of melt direct spinning |
| CN102912463B (en) * | 2012-11-09 | 2015-09-23 | 江阴市华宏化纤有限公司 | black terylene staple fibre production system |
| CN113265710A (en) * | 2021-05-06 | 2021-08-17 | 宿迁逸达新材料有限公司 | Method and equipment for controlling uniformity of fluorescent whitening polyester staple fiber product |
| CN115364757B (en) * | 2022-08-31 | 2024-03-12 | 郑州沃华机械有限公司 | Online tackifying system for PBAT production based on dynamic mixer |
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