KR101080234B1 - Functional polyolefin staple fiber and method for fabricating the same and thermal bonding non-woven using thereof - Google Patents

Abstract

 The present invention is a method for producing a polyolefin short fiber, melting the polyolefin resin; Spinning the melt at a rate of about 30-50 m / min at a spinning temperature of about 250 ° C .; Stretching the spun yarn at a draw ratio of 1.5 to 2.0 and a preheating temperature of 50 to 80 ° C; Crimping to impart crimp to the stretched filaments; A surface treatment step of fusing the crimped filament by spraying a liquid resin containing a functional spinning oil and a green tea extract mixture; And it provides a method for producing a functional polyolefin-based short fibers comprising the short-fiber forming step of cutting the surface-treated filament heat cut after a predetermined length.

 Antibacterial, Deodorant, Polyolefin

Description

Functional polyolefin-based short fibers and a method for manufacturing the same and a thermal bond nonwoven fabric using the same

1 is a flow chart of the manufacturing process of the polyolefin-based short fibers according to an embodiment of the present invention.

The present invention relates to a functional polyolefin short fiber and a method for manufacturing the same, and a thermal bond nonwoven fabric using the same, and in particular, such as heat-sealing properties as a short fiber for a thermal bond nonwoven fabric while providing antimicrobial deodorization and moisturizing effect using a green tea mixed extract. The present invention relates to an improved polyolefin short fiber, a method for preparing the same, and a thermal bond nonwoven fabric using the same.

Nonwoven fabrics are fabrics made by adhering or tangling fiber aggregates by mechanical or chemical treatment such as mechanical manipulation or heat bonding without weaving, weaving or knitting. Felts, resin bonded nonwovens, needle punches, spun bonds, spunlaces, embossed films, wet nonwovens, and the like. By narrowing, it means that the contact of the web (web) overlapped with the random (random) and the fiber is bonded by resin and used as a wick. Also called adhesive fabrics and bonded fabrics. Such a nonwoven fabric can be produced by various methods, such as needle punching method, chemical bonding method, thermal bonding method, melt blown method, spunlace method, stitch bond method, spunbond method is known.

On the other hand, the polyolefin-based nonwoven fabric is used as a sanitary article such as napkins and diapers because the touch is soft and high strength. In particular, polypropylene short fibers are processed into thermal bond nonwoven fabrics through calender bonding or air through bonding due to their unique low melting point and excellent chemical resistance, and are mainly used as surface materials for sanitary products such as diapers and sanitary napkins. Therefore, antibacterial and deodorant properties are very demanded.

In Japanese Patent Application Laid-Open No. 2002-235237, polypropylene heat-sealed nonwoven fabric is made of polysilicon acid salt as a masterbatch pellet as a crystallization inhibitor to impart soft touch and high tensile strength to the nonwoven fabric. However, experiments on spunbonded nonwovens differ from manufacturing methods of thermal bond nonwovens through short fibers. Spunbond nonwoven fabrics have a higher tensile strength than short fiber thermal bond nonwoven fabrics, but are softer in touch. In addition, according to the present technology, when the ethylene content is 1.5 wt% or more with respect to the spunbond nonwoven fabric made from the propylene / ethylene random copolymer, the crystallinity becomes low and may cause a decrease in strength of the nonwoven fabric. In addition, technical solutions to antimicrobial or deodorizing properties are not disclosed.

In addition, the Republic of Korea Patent Invention No. 660067 is a functional agent, characterized in that the composition containing a green silica ingredient containing porous silica encapsulated in an amount of 50 ~ 100g / y impregnated in the fiber fabric, and tenter processing after drying As a manufacturing method and a functional drug of the processed fiber containing a green tea component, using a composition containing 3 to 10% by weight of porous silica encapsulated with a green tea component, it is processed to a fabric fabric by the above method A processed fiber containing the green tea component is proposed. The method and the fiber is to contain the green tea component as a medium of the porous silica, the process is complicated by the addition of an additional process for producing the porous silica, and also includes a porous silica to reduce thermal stability or fiber properties in the secondary processed products There is a disadvantage in that it becomes.

In order to solve the above problems, an object of the present invention is to provide a polyolefin short fibers and antimicrobial deodorization and moisturizing effect and a method of manufacturing the same and a thermal bond nonwoven fabric using the same.

In another aspect, the present invention is to provide a polyolefin short fibers and a method of manufacturing the same, and a thermal bond nonwoven fabric using the same, which can maintain the physical properties of the fibers and nonwovens.

In order to achieve the above object, the present invention provides a method for producing a polyolefin short fiber, melting a polyolefin resin; Spinning the melt at a rate of about 30-50 m / min at a spinning temperature of about 250 ° C .; Stretching the spun yarn at a draw ratio of 1.5 to 2.0 and a preheating temperature of 50 to 80 ° C; Crimping to impart crimp to the stretched filaments; A surface treatment step of fusing the crimped filament by spraying a liquid resin containing a functional spinning oil and a green tea extract mixture; And it provides a method for producing a functional polyolefin-based short fibers comprising the short-fiber forming step of cutting the surface-treated filament heat cut after a predetermined length.

The present invention provides a method for producing a functional polyolefin short fiber wherein the polyolefin resin is homopolypropylene.

In the present invention, the polyolefin-based resin is homopolypropylene, and the production of functional polyolefin short fibers having a melt index (MI) of 10 to 30 g / 10 min, an isotactic index of 90 or more, and a melting point (DSC) of 160 to 165 ° C. Provide a method.

The present invention provides a method for producing a functional polyolefin-based short fiber, wherein the liquid resin is further selected from the group consisting of colorants such as antioxidants, ultraviolet stabilizers, process stabilizers and white pigments together with the green tea extract mixture.

The present invention provides a method for producing a functional polyolefin-based short fibers containing 98.5 to 99.2% by weight of the polypropylene short fibers, 0.8 to 3% by weight, preferably 0.8 to 1.5% by weight of the liquid resin.

The present invention provides a method for producing a functional polyolefin based short fiber, wherein the green tea extract mixture included in the liquid resin is contained in the liquid resin at 0.42 to 0.64% by weight.

The present invention provides a method for producing a functional polyolefin-based short fibers in which the green tea extract mixture contained in the liquid resin contains green tea extract and alum in the liquid resin.

The present invention provides a method for producing a functional polyolefin-based short fiber containing the green tea extract mixture contained in the liquid resin 0.02 to 0.04% by weight, alum 0.4 to 0.6% by weight in the liquid resin.

In the present invention, in the polyolefin short fiber, a coating layer made of a liquid resin is further formed on the surface of the short fiber, and the liquid resin provides a functional polyolefin short fiber including a mixture consisting of green tea extract and alum.

The present invention provides a functional polyolefin-based functional polyolefin-based short fiber containing 98.5 to 99.2% by weight of the polyolefin-based short fiber, 0.8 to 3% by weight, preferably 0.8 to 1.5% by weight.

The present invention provides a functional polyolefin based short fiber in which the green tea extract mixture contained in the liquid resin is contained in the liquid resin at 0.42 to 0.64% by weight.

The present invention provides a functional polyolefin-based short fiber containing the green tea extract mixture contained in the liquid resin is 0.02 to 0.04% by weight, alum 0.4 to 0.6% by weight in the liquid resin.

In the present invention, the polyolefin short fibers are homopolypropylene, and the functional polyolefin short fibers have a melt index (MI) of 10 to 30 g / 10 min, an isotactic index of 90 or more, and a melting point (DSC) of 160 to 165 ° C. to provide.

The present invention provides a functional polyolefin based short fiber produced by the above method.

The present invention provides a functional polyolefin-based nonwoven fabric produced by thermal bonding using the functional polyolefin-based short fibers produced by the above method or the above-mentioned short fibers.

The present invention provides a functional polyolefin-based nonwoven fabric in which the thermal bonding method is a calender bonding method or an air through bonding method.

According to the present invention, the calender bonding method is performed by carding short fibers at a speed of 80 to 150 mpm, and then manufacturing nonwoven webs to produce heat fusion between fibers while passing the webs between hot rolls set at about 140 to 165 ° C. Provided is a functional polyolefin-based nonwoven fabric.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As used herein, the terms "about", "substantially", and the like, are used at, or in close proximity to, numerical values as are indicative of preparation and material tolerances inherent in the meanings mentioned, and are intended to be accurate or to facilitate understanding of the invention. Absolute figures are used to prevent unfair use by unscrupulous infringers.

As used herein, the term "nonwoven fabric" refers to a fabric, felt, and fibrous web made by bonding or tangling fiber aggregates by mechanical or chemical treatment such as mechanical manipulation or heat bonding without undergoing weaving, weaving, or knitting. use.

Figure 1 shows a process for producing a polyolefin-based short fibers according to an embodiment of the present invention.

Polyolefin-based short fibers according to a preferred embodiment of the present invention through the step of melting the polyolefin-based, to produce a non-drawn yarn by spinning the melt (spinning step). The spun unstretched yarn passes through a crimping step of imparting crimp to the stretched filament through the stretching step. The functional spinning emulsion and the green tea extract mixture on the crimped filament are sprayed and fixed by spraying the liquid resin containing nanoparticles onto the fibers (surface treatment step), and then cut to a predetermined length to form short fibers. (Short fiber formation step)

The raw material of the fiber according to the present invention is polyolefin-based and may preferably be homopolypropylene (hPP). The homopolypropylene preferably has a melt index (MI) of 10 to 30 g / 10 min, an isotactic index of 90 or more, and a melting point (DSC) of 160 to 165 ° C. The homopolypropylene short fibers may be used as a surface material of hygiene products such as diapers or sanitary napkins due to their unique low melting point and excellent chemical resistance.

The homopolypropylene is spun at a spinning speed of about 30 to 50 m / min at a spinning temperature of about 250 ℃, appropriately controlled at a draw ratio of 1.5 to 2.0, stretched to a preheating temperature of 50 ~ 80 ℃ after giving a crimp and Spray the liquid resin containing the hydrophilic anti-emulsion emulsion emulsion and green tea extract mixture to attach the spinning emulsion to the fiber surface. After heat setting at about 100 to 120 ° C for about 8 to 12 minutes, the fiber is cut to have a length of about 65 mm, and the final fiber fineness is 6 to 10 deniers and the average elongation is set at 300 to 380%. Fibers can be produced.

Meanwhile, the green tea extract mixture may be made of green tea extract and alum.

Green tea is a tea that dries the leaves of Camellia sinensis and drinks it with hot water, and has been used as a favorite food and medicinal in Korea, Japan, and China. In particular, the catechin component of green tea, a kind of polyphenol, is known to be excellent in antioxidant activity. It prevents and suppresses skin aging caused by ultraviolet rays and harmful environmental factors, and enhances the vitality and immunity of skin mucous membranes and skin cells. Antibacterial effect on various microorganisms is expressed. Green tea extract is an active ingredient extract of green tea obtained by extracting and purifying natural tea leaves. Formula 1 is a chemical structural formula of catechin.

Ingredient Name R ₁ R ₂ (-)-Epicatechin (EC)
(-)-Epigallocatechin (EGC)
(-)-Epicatechin Gallate (ECG)
(-)-Epigallo catechin Gallate (EGCG) H
OH
H
OH H
H
G
G

On the other hand, alum included in the mixture is a double salt formed by sulfate of aluminum sulfate and monovalent metal, and double salt refers to a salt in which two or more types of salts are combined, and ions belonging to the salt. They do not form polyatoms such as complex ions, but exist as independent ions. Alum has the general formula of MIAl (SO 4) 212H 2 O or MI 2 SO 4 Al 2 (SO 4) 324H 2 O. MI refers to a monovalent metal. Depending on what monovalent metal ions are contained, it can be classified into potassium alum (KAl (SO4) 212H2O) and ammonium alum ((NH4) Al (SO4) 212H2O). In addition, a case where other trivalent metal ions such as Ti, V, Cr, Mn, Fe, Co, Rn, Ir, Ga, In are substituted in place of aluminum is also called alum in a broad sense. Alum used in the present invention may be one or more selected from the group consisting of compounds such as potassium alum, ammonium alum, trivalent metal ions in place of aluminum, preferably ammonium alum. The alum can be used to reinforce the binding force of the green tea extract yarn.

The liquid resin may be included in the content of 98.5 to 99.2% by weight of homopolypropylene short fibers, 3% by weight or less, preferably 0.1 to 1.5% by weight of the liquid resin. In addition, the green tea extract mixture may be included in the range of 0.42 to 0.64% by weight in the liquid resin. At this time, the green tea extract may contain 0.02 to 0.04% by weight, alum and 0.4 to 0.6% by weight. If the particles are included in the less than the above range, there is a problem in the expression of antimicrobial, if the above range there is a problem of lowering the physical properties and productivity of the yarn during thermal bonding.

Meanwhile, the liquid resin may further include at least one selected from the group consisting of coloring agents such as antioxidants, ultraviolet stabilizers, process stabilizers and white pigments in addition to the green tea extract mixture.

When a short fiber is produced by the method according to a preferred embodiment of the present invention, a thermal bond process for manufacturing a nonwoven fabric may be performed. The thermal bonding method may be performed using a calendar bonding method and an air through bonding method. Calender bonding method is to produce a non-woven web after carding short fibers at a speed of 80 to 150 mpm, the heat between the fibers is produced by passing through the hot roll (Hot Roll) is set to about 140 ~ 165 ℃ Can be. In this case, the basis weight of the nonwoven fabric is preferably 20 to 30 gsm.

On the other hand, if foreign matters are attached to the surface of the fiber, bubbles are generated during fusion, which causes deterioration of the properties of the nonwoven fabric. Therefore, proper content ratio of green tea extract mixture is important.

In the present invention, in manufacturing a thermal bond nonwoven fabric through a calender bonding facility, the hot roll temperature of hot roll is most suitable for the nonwoven fabric production rate, the shape of the embossed pattern of the roll, the difference between the roll setting temperature and the surface temperature, and the like. It is not an absolute result but a relative result because it may vary depending on the production equipment conditions of the calender bonding method and the fineness of the short fibers used as raw materials.

Example  One

 (Production of Polyolefin Short Fibers)

A homopolypropylene resin having a MI of 10 to 35 g / 10 min and II of 90 or more was prepared at a spinning temperature of about 250 ° C. and a spinning speed undrawn yarn of about 40 m / min, and the undrawn yarn was drawn at a draw ratio of about 1.5 to 2.0. Appropriately adjusted and preheated to about 80 ℃ to give a crimp in the crimper, and was applied by spraying a liquid resin containing a hydrophilic spinning emulsion emulsion and green tea extract mixture. At this time, the content of the spinning oil was 1.2% by weight based on the total weight of short fibers, the green tea extract in the mixture was 0.03% by weight, and the alum was 0.5% by weight. After heat setting at about 110 ° C. for about 8 to 12 minutes, the fiber was cut to 65 mm in length to prepare a final polyolefin short fiber having 8 deniers and an average elongation of 370%.

(Production of Polyolefin Thermal Bonding Nonwoven Fabric)

The polyolefin short fibers obtained by the above method were carded with a card machine at a speed of 95 mpm, a nonwoven web was produced, and passed through two hot rolls to prepare a calender-bonded nonwoven fabric having a basis weight of 22 gsm. At this time, while the temperature of the hot roll to 140 ~ 165 ℃ to find the optimum temperature of the non-woven fabric with the most excellent tensile strength heat fusion temperature (hereinafter referred to as the optimum hot roll temperature) to measure the physical properties.

Example  2

Work was carried out in the same manner as in Example 1, with a ratio of 1.0% by weight of the anion-containing liquid resin sprayed on homopolypropylene short fibers, 0.022% by weight of green tea extract, 0.42% by weight of alum.

Example  3

Work was carried out in the same manner as in Example 1, but the ratio of the anion-containing liquid resin sprayed on homopolypropylene short fibers 1.4% by weight, green tea extract 0.038% by weight, alum 0.55% by weight.

Comparative example  One

Operation was carried out in the same manner as in Example 1, but did not spray an anion-containing liquid resin.

* Method of Analysis

1. Melt Index (MI): According to ASTM D 1238

hPP and random copolymer series. 230 ℃, 2.16kg load

      * PE series such as HDPE, LDPE… 190 ℃, 2.16kg load

2. Isotactic Index (I.I): ISO 9113: 1986... Plastics-Polypropylene (PP) and propylene-copolymer thermoplastics-Determination of isotactic index: After boiling normal heptane to dissolve the atactic component, the remaining isotactic component is weighed and expressed as wt%, and this weight percent is called isotactic index. .

3.Xylene Soluble (hereinafter referred to as XS): ISO 16152: 2005

4. Radioactivity: Evaluated by measuring the number of fiber breaks and the number of spin drops generated under the detention of 37,125 holes.

      However, trimming or dropping is less than once / hour: ◎

      However, trimming or dropping is 1 ~ 3 times / time: ○

      Only three times / time of drop or drop: △

      No radiation: ×

5. Elongation: Emissive during soft work

      Less than 1 time / hour: ○, 1 ~ 2 times / time: △, More than 3 times / hour: ×

6. Crimping workability: The number of times the stretched tow failed by passing through the crimper by visual observation.

      Less than 1 time / hour: ○, 1 ~ 2 times / time: △, More than 3 times / hour: ×

7. Single fiber fineness: Determination of fineness based on ASTM D1577

8. Non-woven carding property: When the short fiber passes through the carding machine, curling or flying occurs between the card rolls, or it is judged to be defective when the web formation is not good.

9. Basis weight: weight of nonwoven

10. Nonwoven fabric tensile strength and elongation: cut-strip method of JIS L 1096 (sample width 5cm, length 14cm)

      MD: Machine direction of nonwoven fabric

      CD: Lateral direction of nonwoven fabric

11.TBI (Thermal Bondability Index) = (MD strength × CD strength) 1/2 × (20 / base weight)

division Example 1 Example 2 Example 3 Comparative Example 1 burglar
Kg / 5cm MD 4.80 4.78 4.75 4.81 CD 1.45 1.44 1.44 1.45 Breaking Break
% MD 60 60 60 60 CD 100 100 92 100

Table 1 evaluates the physical properties of the nonwoven fabrics prepared from the examples and the comparative examples, it can be seen that the examples do not change the general non-woven fabrics and physical properties even if the green tea extract mixture is included.

division BLANK Example 1 Strain 1 Initial bacterial count 1.6 X 10 ⁵ 1.6 X 10 ⁵ 24 hours later 7.2 X 10 ⁶ <10 (less than) Bacterial reduction rate - 99.9 Strain 2 Initial bacterial count 1.5X10 ⁵ 1.5X10 ⁵ 24 hours later 7.2 X 10 ⁶ <10 (less than) Bacterial reduction rate - 99.9 Strain 3 Initial bacterial count 1.3 X 10 ⁵ 1.3 X 10 ⁵ 24 hours later 6.4 X 10 ⁶ <10 (less than) Bacterial reduction rate - 99.9

* Increase: Strain 1 45 times

Strain 2 48 times

Strain 3 49 times

* Inoculation bacterial concentration: Strain 1-1.6X105 / ml

Strain 2 1.5X105 / ml

Strain 3-1.3X105 / ml

* Type of nonionic surfactant: TWEEN 80 (0.05%)

* Exam conditions

-Test bacteria after shaking culture at 35 ± 1 ℃ for 24 hours (number of shaking 150 times / min)

-Sample surface area 60cm2

* Neutralization solution: Phosphate buffer solution (pH 7.0 ± 0.2)

* Used strain: Strain 1 Escherichia coli ATCC 25922

Strain 2 Staphylococcus aureus ATCC 6538

Strain 3 Candida albicans ATCC 14053

* Testimonials

The nonwoven fabrics prepared in Example 1 and Comparative Example 1 were made into the inside, and the materials were secreted every day and tested for 20 people between 20 and 40 years of age when wearing the moisturizing effect. Two target groups were worn to cross Example 1 and Comparative Example 1, respectively.

unit : % division Effective Little effect no effect Example 1 50 25 25 Comparative Example 1 15 10 75

As described above, the polyolefin-based short fibers according to an embodiment of the present invention, a method for preparing the same, and a thermal bond nonwoven fabric using the same exhibit excellent antibacterial and moisture retention effects.

In addition, the short fiber according to the present invention has the effect that the physical properties of the final product is hardly minimized by minimizing the occurrence of deterioration of physical properties of the nonwoven fabric such as air bubbles during the process of manufacturing the nonwoven fabric by thermal bonding by applying the green tea extract mixture. .

Therefore, the short fibers and nonwoven fabrics according to the present invention are not only suitable for hygiene products such as diapers, sanitary products, wet tissues, etc., but also have antibacterial and deodorizing properties, and thus can be applied as hygiene products having excellent functionality with prevention and deodorization of pathogens. have. In addition, due to the moisturizing effect it will be applicable to clothing for improving skin diseases such as atopy.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

Claims (17)

In the method for producing a polyolefin short fiber, Melting a polyolefin-based resin; Spinning the melt at a rate of 30 to 50 m / min at a spinning temperature of 250 ° C .; Stretching the spun yarn at a draw ratio of 1.5 to 2.0 and a preheating temperature of 50 to 80 ° C; Crimping to impart crimp to the stretched filaments; A surface treatment step of fusing the crimped filament by spraying a liquid resin containing a functional spinning oil and a green tea extract mixture; And Method of producing a functional polyolefin-based short fibers comprising the step of forming a short fiber to heat the surface-treated filaments and cut by a predetermined length after heat setting. The method of claim 1, The polyolefin resin is a homopolypropylene method of producing a functional polyolefin-based short fibers. The method of claim 1, The polyolefin resin is a homopolypropylene, a melt index (MI) of 10 to 30g / 10min, isotactic index of 90 or more, melting point (DSC) of 160 to 165 ℃ manufacturing method of functional polyolefin-based short fibers. The method of claim 1, The liquid resin is a method of producing a functional polyolefin-based short fibers further comprises one or more selected from the group consisting of colorants such as antioxidants, ultraviolet stabilizers, process stabilizers and white pigments with the green tea extract mixture. The method of claim 1, The polyolefin-based short fibers are 98.5 to 99.2% by weight, the liquid resin containing 0.8 to 1.5% by weight of the method of producing a functional polyolefin-based short fibers. The method of claim 5, Green tea extract mixture contained in the liquid resin is a method of producing a functional polyolefin-based short fibers contained in the liquid resin 0.42 to 0.64% by weight. The method of claim 1, Green tea extract mixture contained in the liquid resin is a method for producing a functional polyolefin-based short fibers containing green tea extract and alum in the liquid resin. The method of claim 1, Green tea extract mixture contained in the liquid resin is a method for producing a functional polyolefin-based short fibers containing 0.02 to 0.04% by weight, 0.4 to 0.6% by weight of green tea extract in a liquid resin. In the polyolefin short fiber, The coating layer made of liquid resin is further formed on the surface of the short fiber, The liquid resin is a functional polyolefin based short fiber containing a mixture consisting of green tea extract and alum. 10. The method of claim 9, The functional polyolefin-based functional polyolefin-based short fibers, wherein the polyolefin short fibers are 98.5 to 99.2% by weight, and the liquid resin is contained in an amount of 0.8 to 1.5% by weight. 10. The method of claim 9, Green tea extract mixture contained in the liquid resin is a functional polyolefin-based short fibers contained in the liquid resin in 0.42 to 0.64% by weight. 10. The method of claim 9, Green tea extract mixture contained in the liquid resin is a functional polyolefin-based short fibers containing 0.02 to 0.04% by weight, 0.4 to 0.6% by weight of green tea extract in the liquid resin. 10. The method of claim 9, The polyolefin short fiber is a homopolypropylene, a functional polyolefin short fiber having a melt index (MI) of 10 to 30 g / 10 min, an isotactic index of 90 or more, and a melting point (DSC) of 160 to 165 ° C. The functional polyolefin type short fiber manufactured by the method of any one of Claims 1-8. The functional polyolefin nonwoven fabric manufactured by the thermal bonding method using the functional polyolefin short fiber manufactured by the method of any one of Claims 1-8, or the short fiber of any one of Claims 9-13. . The method of claim 15, The thermal bonding method is a functional polyolefin-based nonwoven fabric which is a calender bonding method or an air through bonding method. The method of claim 16, The calender bonding method is a functional polyolefin nonwoven fabric prepared by carding short fibers at a speed of 80 to 150 mpm, and then producing nonwoven webs and thermally fusion between fibers while passing the webs between hot rolls set at 140 to 165 ° C. .

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