JP2008038298A - Optical interferrence multifilament yarn and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for stably producing an optical interference monofilament yarn having sufficient color development intensity and high-order processability and to obtain an optical interference multifilament yarn having the properties. <P>SOLUTION: The method for producing the optical interference multifilament yarn inclued melting and delivering two kinds of polymers having different refractive indexes in a flat filament in which the two polymers are laminated in parallel with the major axis direction of the flat cross section of the filament from a delivery hole having a flatness ratio of 5-35 at a delivery linear velocity J of 4.5-20 m/minute, taking off a multifilament yarn composed of the filament at a spinning velocity V of 300-6,000 m/minute and a spinning draft ratio V/J of 50-600 and further drawing the multifilament yarn. In the multifilament yarn composed of a flat filament in which two kinds of polymers having different refractive indexes are laminated in parallel with the major axis of the flat cross-section, the ratio of the length of a part having thickness with the crosssectional area ≥1.2 times that of other parts is ≤1% on the basis of the length of the filament. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light-interfering multifilament with improved weaving and knitting properties, comprising flat filaments obtained by alternately laminating two kinds of polymers having different refractive indexes in parallel with the major axis direction of a flat section. The present invention relates to a yarn and a manufacturing method thereof.

  Conventionally, as a filament having a multilayer thin film structure that develops a color having a wavelength in the visible light region by reflection of natural light and interference action, for example, a structure in which a transparent metal compound is deposited on a filament base material, a refractive index. A thin-film multilayer structure in which two different types of transparent polymers are alternately laminated is known.

As for the former, production technology for thin film deposition has been established, and such a thin film deposition filament has already been put to practical use. However, this filament has a problem that the deposited film peels off due to friction received in the process of making a fabric or a product from the filament, or due to a change in product usage over time.
On the other hand, for the latter, since the filament itself has optical coherence, the peeling resistance in use is much better than that of the vapor deposition structure. Such multifilament yarn is disclosed in, for example, Patent Document 1.

Patent Documents 2 and 3 disclose techniques for suppressing the growth of foreign matter that accumulates around the die discharge hole during spinning, that is, the die surface foreign matter, and the generation of fuzz due to the polyester polymerization catalyst. ing.
On the other hand, Patent Document 4 discloses a light-interfering multifilament yarn having a more excellent color development strength by devising the shape of the die discharge hole.

  However, since the optical coherent multifilament yarn has a special flat laminated composite fiber cross section, it is difficult to form the fiber uniformly at the portion to be thinned from discharge in the yarn making process, and the cross section is partially thick. The phenomenon that remains is likely to occur. If the thick part remains, the layer thickness of the cross-section changes greatly, resulting in disappearance of specific colors, resulting in poor color development of the entire multifilament yarn, and features of light interference multifilament yarn that produces elegant glossy color development without dyeing Is damaged. In addition, it is connected to fluff due to single fiber breakage in the yarn making process, or the thick part of the cross section is caught in the yarn guide or yarn feeding device in the weaving and knitting process to induce a stop or a fabric defect, Causes it to worsen.

Japanese Patent Laid-Open No. 11-124748 JP 2004-218140 A JP 2004-277893 A JP-A-2005-194661

  The present invention has been made against the background of the above-described prior art, and its purpose is to stabilize a light-interfering multifilament yarn having sufficient color development strength and good high-order workability, particularly weaving and knitting. It is in providing the manufacturing method obtained by doing. Another object is to provide an optical coherent multifilament yarn having the above characteristics.

  According to the study by the present inventors, the above object is to obtain a flat filament in which two kinds of polymers having different refractive indexes are laminated in parallel with the major axis direction of the flat cross section, and the flatness ratio is 5 to 5. 35 is discharged from a discharge hole with a discharge linear velocity J of 4.5 to 20 m / min, a multifilament yarn made of the filament is spun at a spinning speed V of 300 to 6000 m / min, and a spinning draft ratio V / J is set. It has been found that it can be achieved by a method for producing a light-interfering multifilament yarn characterized in that it is taken as 50 to 600 and further drawn.

  Another object is a multifilament yarn composed of flat filaments in which two types of polymers having different refractive indexes are laminated in parallel with the major axis direction of the flat cross section, and the filaments are partially The thickness of the thick part, which is included in the cross-sectional area of 1.2 times or more of the other part, is 1% or less based on the length of the filament. It has been found that this can be achieved with multifilament yarns.

  According to the production method of the present invention, the multifilament yarn having a very special cross section is partially thickened by the overall effect of the conditions of the discharge hole shape, the discharge linear velocity, the take-up speed, and the draft ratio of the spinneret. It is possible to easily produce a light coherent multifilament that suppresses the expression of the portion and has sufficient light interference coloring intensity and high-order processability at the same time. Furthermore, the present invention achieves an unprecedented high quality interference multifilament yarn having the above-described characteristics.

  The method for producing an optical coherent multifilament yarn of the present invention is a flat filament in which two polymers having different refractive indexes are laminated in parallel with the major axis direction of the flat cross section under specific conditions described later. This is a production method in which a light coherent filament (hereinafter sometimes referred to simply as a filament) is melted and discharged from a discharge hole of a spinneret, a multifilament yarn made of the filament is taken, and this is further drawn.

First, the present invention will be described with reference to the drawings for the filament. FIG. 1 is a schematic view showing an example of a cross section of the filament, but the non-laminated portion may be omitted. The two polymers constituting the filament need to be combined with different refractive indexes. In general, the refractive index of the polymer is in the range of 1.30 to 1.82, of which the general-purpose polymer is in the range of 1.35 to 1.75. Among these, when the refractive index of the polymer component on the high refractive index side is n ₁ and the refractive index of the polymer component on the low refractive index side is represented by n ₂ , the ratio of the refractive indexes of both polymers n ₁ / n _What is necessary is just to select what becomes ₂ in the range of 1.02-1.4. Specifically, the combination of polyester, nylon, polyolefin, etc. is mention | raise | lifted and the combination of polyester and nylon is especially preferable.

  According to the theory of optical interference, when the thickness of all layers is equal to the reference thickness, the number of polymer layers in the cross section of the filament reaches the saturation state when there are at most 10 layers. Increasing the number of layers only complicates the filament forming process. However, when the flatness ratio is increased, the thickness of each stacked unit tends to fluctuate and the amount of interference light may be insufficient. Therefore, the number of stacked layers is preferably 15 or more. Furthermore, the larger the flatness ratio, the better the number of stacked layers. Specifically, 20 or more layers are preferable, and 25 or more layers are more preferable. A larger number of layers can compensate for the fluctuation of the thickness and increase the interference, but it is easy to handle due to the difficulty of the manufacturing technology, especially the complexity of the spinneret and the control of the molten polymer flow. Up to 140 layers. Beyond that, the fluctuation width of the thickness of the laminate is widened, and it is difficult to obtain the effect of simply increasing the number of layers. Practically, it is preferably 50 layers or less.

  Moreover, it is preferable that the flatness rate of the said filament is 2.0-7.0 from a viewpoint of fully expressing an optical interference function. Here, the flatness ratio is expressed by the ratio of the long side / short side of the filament cross section.

  In spinning, for example, using a spinneret as shown in FIG. 3 of JP-A-11-124748, it is melted as a multifilament yarn composed of filaments having a flat cross section obtained by laminating two kinds of polymers. It can be discharged.

  At this time, the yarn is melted and discharged from a flat discharge hole provided in the spinneret, but the yarn has not only a flat shape but also a laminated section as described above. In comparison with the spinning of ordinary round cross-section filaments, a phenomenon in which the cross section remains partially thick tends to occur in the process from the melt discharge to the thinning. Specifically, a thick portion where the cross-sectional area of the filament is three times or more that of the other portion has a relatively short length of 0.1 to 1 cm, and the cross-sectional area of the filament is 1. A portion having a thickness of about 2 to 1.3 times occurs with a length of several centimeters to 30 centimeters. In particular, when a long and thick part such as the latter is formed, the part loses the ability to specifically reflect light of a desired wavelength and reflects light of another wavelength. The light of the wavelength will be mixed and will appear whitish. That is, it is an undesirable phenomenon because the color development becomes light. Also, the filament cross-sectional area that is three times thicker than other parts is prone to breakage and fluff in the drawing process and weaving / knitting process. This is the yarn feeder and various guides in the weaving / knitting process. It becomes a cause of causing a stop or an abnormal fabric quality, etc.

  According to the study by the present inventors, a phenomenon in which the cross section remains thick occurs frequently in a portion where the multifilament yarn is discharged from the discharge hole of the spinneret and a portion where the yarn is thinned and cooled, In particular, it has been found that a thick portion is likely to occur when the discharge linear velocity when the yarn from the discharge hole is melted and discharged is low. In addition, this phenomenon becomes more conspicuous when the discharge linear speed is the same, when the spinning draft ratio is high, that is, when the spinning speed is high, and is likely to occur when the complicated cross-sectional shape described above is to be rapidly formed. I also investigated.

  Therefore, in the present invention, the filament is melted and discharged from a discharge hole having a spinneret flatness ratio of 5 to 35 at a discharge linear velocity J of 4.5 to 20 m / min, and a multifilament yarn made of the filament is formed. It is important that the spinning speed V is 300 to 6000 m / min and the spinning draft ratio V / J is 50 to 600.

  That is, when the discharge linear velocity J is less than 4.5 m / min, a thick part is likely to occur in the filament after stretching. This is because the molten polymer flow from the discharge hole is slow and is stretched in the spinning line direction before the thinning and solidification are stably finished, so that a thick and thin spot tends to be formed. In such a case, by reducing the spinning speed and lowering the spinning draft ratio, the frequency of occurrence of the thick portion decreases, but when the discharge linear speed is less than 4.5 m / min, the discharge hole area is larger than the discharge amount. Therefore, the discharge itself is likely to be unstable, and it is difficult to eliminate the thick portion. On the other hand, when the discharge linear velocity exceeds 20 m / min, the amount of polymer discharged from the discharge hole is too large, and discharge pulsation occurs, resulting in deterioration of light interference color development due to unevenness of thickness and eventually disturbance of the laminated portion of the cross section. , Leading to frequent thread breaks and loops. The discharge linear velocity J is preferably 4.5 to 17 m / min.

  The spinning speed V is set to 300 to 6000 m / min, preferably 500 to 3000 m / min, in order to stably produce the multifilament. Further, the elongation of the multifilament yarn is preferably 15 to 50%, more preferably 15 to 40% from the viewpoint of high-order workability and yarn forming property. It can be set arbitrarily at any time.

  Furthermore, in order to obtain the above-described flat filament, a lower discharge linear velocity is advantageous in terms of atypical cross section, but there is an aspect contrary to uniform thinning, while taking both into account. It is necessary to set the optimum discharge linear velocity and spinning draft ratio. Therefore, the draft ratio V / J is 50 to 600, preferably 50 to 400.

  The flattening of the cross section of the filament is important in order to strongly develop the light interference coloring, and the shape of the discharge hole of the spinneret is also flat. As described above, the flatness ratio of the discharge hole is 5 to 35. , Preferably 10-30. Here, the flatness ratio of the discharge hole is expressed by the ratio of the long side to the short side of the discharge hole and the long side / short side. The shape of the discharge hole may be a rectangular hole (flat hole) or a shape in which round holes are provided at both ends of a rectangular hole (flat hole) disclosed in JP-A-2005-194661. In the case of a shape in which round holes are attached to both ends of the rectangular hole, the short side of the rectangular part is applied as the “short side of the discharge hole”. When the flatness ratio of the discharge holes is less than 5, it is difficult to form a flat cross section, and the shape tends to be close to a round cross section. Further, the laminated portion of the cross section tends to have a distorted shape, and the light interference color development becomes weak. On the other hand, when the flatness ratio of the discharge holes exceeds 35, the discharge and thinning of the molten polymer becomes unstable, the laminated portion of the cross section often becomes a distorted shape, and the light interference color development becomes weak. Further, unevenness in the thickness of the yarn is likely to occur, and the frequency of yarn breakage increases, resulting in poor productivity.

  The multifilament yarn of the present invention can be produced by taking a multifilament yarn composed of the filaments melted and discharged, and further drawing it. At this time, the elongation of the multifilament yarn can be set to 10 to 50% by setting the draw ratio to 1.2 to 5 times. The above-mentioned drawing can be produced by a two-step method in which the taken multifilament yarn is once wound up, drawn again, and further heat set as necessary. However, considering mass productivity, the drawn multifilament is taken up. It is more preferable to produce the yarn by spinning the yarn directly without winding it once, and further by the spinning direct drawing method in which the yarn is heated and set as necessary.

  In addition, since the generation | occurrence | production frequency of a thick part will become high when the fineness of a filament is low, it is preferable that this fineness shall be 3 dtex or more, and this fineness is more preferable 4-20 dtex from a spinning property, color development property, workability, etc. On the other hand, in the present invention, the generation of a thick portion is suppressed in a relatively thin filament of 4 to 10 dtex, and a more remarkable improvement effect is exhibited.

According to the production method of the present invention described above, the following optical coherent multifilament having excellent high-order processability and sufficient color development intensity can be obtained.
That is, a multifilament yarn composed of flat filaments in which two types of polymers having different refractive indexes are laminated in parallel with the major axis direction of the flat cross section, and is partially contained in the filaments. The ratio of the thick part whose cross-sectional area is 1.2 times or more of the other part is an optical coherent multifilament yarn having 1% or less based on the length of the filament.

When the ratio of the thick part whose cross-sectional area is 1.2 times or more of the other part exceeds 1% of the length of the filament, the high-order workability deteriorates, and the weaving property and knitting property are deteriorated. descend. In addition, it is difficult to obtain sufficient color intensity. The ratio is preferably 0.5% or less, and more preferably 0.2% or less.
Further, the above-mentioned optical coherent multifilament yarn has a very small proportion of thick portions and no distortion of the laminated portion in the cross section of the filament, so it has a reflectance difference of 8% or more, and has a sufficient color intensity. Can be achieved.

Further, in the multifilament, the number of fluffs or loops expressed in a thick part where the cross-sectional area of the filament is 3 times or more of the other part is preferably 0.5 or less per million m. Such a level can be realized by the manufacturing method described above.
In the present invention, the flatness of the filament cross section is preferably 2.0 to 7.0 from the viewpoint of sufficiently expressing the optical interference function.

  The multifilament yarn of the present invention exhibits a different colored appearance depending on its use form, and can therefore be used in a wide range of application fields. For example, a fabric in which the ground yarn is a dark filament, particularly a black filament, the multifilament yarn of the present invention is used as a floating yarn, and a pattern is expressed with dobby or jacquard has a traditional Japanese elegance. Suitable for furoshiki, sandals, handbags, ties, paddles, etc.

  In addition, the thin fabric in which the warp yarn is white and the multifilament yarn of the present invention is woven into the weft is transparent, bridal wear such as wedding dress, party dress, stage costume, gift wrapping paper, ribbon, Suitable for tape, curtain, etc. At that time, weaving a jacquard pattern gives it an even more elegant and elegant pearl luster, and an excellent design.

  Here, as a kind of warp, by selecting various fiber materials such as polyester, silk, wool, cotton, nylon, etc., it becomes a fabric exhibiting a unique appearance and function. Further, a function such as stretching can be imparted by weaving the interferometric multifilament yarn of the present invention and other fibers such as polyurethane or covering yarn coated with nylon on the weft. In general, if the light-interfering multifilament yarn of the present invention occupies a ratio of 10% or more of the entire fabric, it is possible to give the fabric a unique design characteristic due to colored gloss in some form.

In addition, when these fabrics are sandwiched between a glass plate and various transparent plastic plates, they each have a unique gloss coloring feeling due to the difference in the refractive index of the plate material.
Furthermore, by making use of the metallic luster color unique to the multifilament yarn of the present invention, it is possible to provide wear with even better visibility in the field of sportswear where glossy yarn and fluorescent yarn have been used. For example, ski wear, tennis wear, swimwear, leotard, etc., and also suitable for sports equipment such as tents, parasols, rucksacks, shoes, especially sneakers.
Similarly, there are art and crafts such as emblems, emblems, art flowers, embroidery, wallpaper, artificial hair, car seats, pantyhose, etc. as eye-catching applications with metallic luster colors and pearl-like colors.

On the other hand, the glitter material obtained by cutting the multifilament yarn of the present invention into a powder form by cutting into a range of 0.01 mm to 10 cm is a surface layer of cosmetics, in particular, the skin, lips and nails, eyelashes or hair of the face and human body. It can be used by being contained in a cosmetic for a growing part (hereinafter sometimes referred to as a cosmetic composition).
In the cosmetic composition, the glittering material is 0.01 to 50% by weight, preferably 0.1 to 30% by weight, more preferably 0.3 to 20% by weight, based on the total amount of the composition. It can be included.

  More specifically, skin products (foundation), makeup products for cheeks or eye shadows, lip products, concealers, blusher, mascara, eyeliner, makeup products for eyebrows, lip or eye pencils Nail products, body make-up products, hair make-up products (hair mascara or hair spray) and the like. These cosmetic compositions can be used to apply to keratin materials or used to modify makeup, for example, over makeup already deposited on keratin materials (The composition is applied as a top product, commonly referred to as a top coat).

The cosmetic composition should be applied over makeup accessories (supports) such as artificial nails, false eyelashes, artificial hair, wigs, pastels or patches attached to the skin or lips. You can also.
At this time, the glittering material of the present invention can be contained in a hydrophilic medium or a lipophilic medium to form a cosmetic composition.

  In addition, the glitter material obtained by cutting the multifilament yarn of the present invention into a powder form by cutting in a range of 0.01 mm to 10 cm can be used as a paint, and as a method for adding a glitter material to the coating, A known method can be used. Moreover, the glitter material of this invention can immerse a support body in a coating material, or can spray a support body with a spray by adjusting length.

  Hereinafter, the present invention will be described more specifically with reference to examples. In addition, each item in an Example was measured with the following method.

(1) Flatness of filament cross section, number of layers Measure the long side and short side of the cross section of the filament with a microscope (magnification 40 times), and determine the length and flatness (ratio of long side / short side) of each part. Asked. Moreover, it confirmed similarly about the number of lamination | stacking.

(2) Elongation Using an RTM-300 TENSILON tensile tester manufactured by Toyo Baldwin Co., Ltd., measured five times at a test length of 200 cm and a tensile speed of 200 mm / min, and the average value was taken.

(3) Reflectance difference (light interference color intensity)
Using a spectrocolorimeter Color-Eye 3100 manufactured by Macbeth Co., colorimetrically measured with a multi-filament yarn wound on a blackboard at a pitch of 40 turns / cm, and a peak reflectance value of a spectral reflection curve in a wavelength range of 400 to 700 nm The value obtained by subtracting the reflectance value at a wavelength of 350 nm was defined as the reflectance difference. This represents the intensity of color development, and 8% or more was accepted.
In addition, since the numerical value of the reflectance difference varies depending on the degree of entanglement by interlacing or the like to the optical coherent multifilament, the yarn wound without interlacing was measured.

(4) Length of thick filament cross-sectional area, number of fluff or loops 48 multifilament yarns wound in a package are hung on a warping machine with a fluff detection device manufactured by Kasuga Electric Co., Ltd., at a speed of 200 m / min. I took the warp. Each time the warping machine was stopped, the cross-sectional area of the filament cross section of that part was confirmed with a microscope (magnification 40 times), and the length of the thick part where the area was 1.2 or more of the other part was measured. . At the same time, if the cross-sectional area is three times thicker than other parts and fluff or loops appear, count the number of them and convert them per multifilament yarn length of 10 ⁶ m did.

(5) Weaving Weaving was performed in the air jet loom using the multifilament yarn obtained in each example and comparative example as the weft and the polyester filament yarn of 20 dtex as the warp yarn under the following conditions. The number of vehicles (times / vehicles / day) was investigated and ranked according to the following criteria.
Woven structure: Plain weave with a width of 1.4 m (34 warps / cm, 31 wefts / cm)
Weft driving: 400rpm
Good: 2 stops / unit / day or less and 7 or less weft defects in the fabric length of 50 m. Bad: 3 stops / unit / day or more or 8 weft defects in the fabric length of 50 m or more.

[Example 1]
A polyethylene terephthalate polyester having an intrinsic viscosity of 0.54 copolymerized with 0.9 mol% of 5-sodium sulfoisophthalic acid and nylon 6 having an intrinsic viscosity of 1.20 are described in JP-A-11-124748. Using a composite spinneret, spinning was performed at a discharge hole flatness ratio of 25, a discharge linear velocity of 7.0 m / min, a die temperature of 280 ° C., a take-up speed of 1100 m / min (draft ratio of 157), and a draw ratio of 3 The film was stretched at 3 times, stretching temperature (supply roller surface temperature) of 105 ° C. and set temperature of 180 ° C. (stretching roller surface temperature), then entangled with an interlace nozzle, and wound as a multifilament of 80 dtex 20 filaments. Thus, the number of alternating layers of the two types of polymers is 30 layers, the flatness is 2.5, the elongation is 30%, and the non-laminated region made of copolymerized polyethylene terephthalate polyester is formed on the outer periphery of the flat laminated portion. A multifilament yarn having the provided cross-sectional shape was obtained. The results are shown in Table 1.

[Examples 2 to 4]
The same procedure as in Example 1 was performed except that the flatness ratio, discharge linear velocity, and spinning draft ratio of the spinneret discharge holes were changed as shown in Table 1. In this example, like Example 1, it had excellent color development and weaving properties. The results are shown in Table 1.

[Examples 5 and 6]
The optical coherent multifilament was 120 dtex 12 filament, and the same procedure as in Example 1 was performed except that the flatness ratio, discharge linear velocity, and spinning draft ratio of the spinneret discharge holes were changed as shown in Table 1. In this example, like Example 1, it had excellent color development and weaving properties. The results are shown in Table 1.

[Comparative Examples 1-4]
The same procedure as in Example 1 was performed except that the flatness ratio, discharge linear velocity, and spinning draft ratio of the spinneret discharge holes were changed as shown in Table 1. In Comparative Example 1, ejection pulsation due to insufficient ejection linear velocity occurred, and there were many thick parts and accompanying fluff, and the deterioration of the light interference coloring intensity and the problem of weaving were observed.
In Comparative Example 2, there were many thick portions in the filament length direction due to excessively high discharge linear velocity, and deterioration of the light interference color development intensity due to this was observed. In Comparative Example 3, the flatness ratio of the fibers was lowered due to the lack of the flatness ratio of the discharge holes, and the light interference coloring intensity was significantly deteriorated due to the distortion of the lamination. In Comparative Example 4, since the flatness ratio of the discharge hole was too large, discharge pulsation occurred, many thick portions were observed in the filament length direction, and deterioration of light interference color development due to disorder of the laminated portion of the filament cross section was observed.

  According to the production method of the present invention, a light-interfering multifilament yarn having sufficient color development strength and good high-order processability, particularly weaving property and knitting property can be stably obtained. Moreover, since the light-interfering multifilament yarn of the present invention has the above properties, it can be widely used in various applications such as clothing such as Japanese clothing, sports, outerwear, innerwear, cosmetics, and painting.

It is one schematic diagram of the cross section of the optical coherent filament concerning this invention.

Explanation of symbols

A and B: layers composed of two kinds of polymers each having a different refractive index C: non-laminated portion

Claims (6)

  A flat filament in which two types of polymers having different refractive indexes are laminated in parallel with the major axis direction of the flat cross section is discharged from a discharge hole having a flatness ratio of 5 to 35 to a discharge linear velocity J of 4.5. ~ 20 m / min. Melt discharge, take multifilament yarns composed of the filaments with a spinning speed V of 300-6000 m / min and a spinning draft ratio V / J of 50-600, and further drawing it A method for producing a light-interfering multifilament yarn.   The method for producing a light-interfering multifilament yarn according to claim 1, wherein the two kinds of polymers are polyester and nylon, and the number of laminated layers is 15 to 140 layers.   A multifilament yarn comprising flat filaments in which two types of polymers having different refractive indexes are laminated in parallel with the major axis direction of the flat cross-section, the cross-section being partially contained in the filament A light-interfering multifilament yarn characterized in that the length of a thick portion whose area is 1.2 times or more of the other portion is 1% or less based on the length of the filament.   The optical coherent multifilament yarn according to claim 3, wherein the multifilament yarn has a reflectance difference of 8% or more.   The optical coherent multifilament yarn according to claim 3 or 4, wherein the two kinds of polymers are polyester and nylon, the number of laminated layers is 15 to 140 layers, and the flatness is 2.0 to 7.0.   In the filament, the number of fuzz or loops expressed in a thick part having a cross-sectional area three times or more that of the other part is 0.5 or less per million meters. The optical coherent multifilament yarn described.

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