JP2020007066A - Fiber package, and manufacturing method thereof - Google Patents

Abstract

To provide a fiber package preferably usable for general industrial material application, which improves an unwinding property of a package during high-degree processing while suppressing grade/quality of the package.SOLUTION: According to a package formed by winding a filament having a tensile elongation of 5.0% or less and an initial modulus of 300 cN/dtex or more, a fiber package has a feature in which the filament is wound so that a twill angle falls within a range of 5-16°, and an interval α of two yarns adjacently parallel to each other on the package maintains the following range. 0.60 H<α<1.40 H, where H is yarn width (μm).SELECTED DRAWING: None

Description

  The present invention relates to a fiber package and a method for manufacturing the same.

A fiber package is produced by winding a filament around a bobbin while traversing (traversing) regularly. The regular winding is represented by parameters representing a locus of filament wound into the package called winding number, upon traversing frequency N _{tr [cpm]} and its time of spindle speed N _{sp [rpm],} wind It is expressed as the number W = _Nsp / _Ntr . That is, the value of the wind number W represents the ratio between the number of times the traverse reciprocates per minute and the spindle speed.

  Further, as a winding method of the filament, a winding with a constant twill angle or a winding with a constant winding number is generally used. The constant winding angle winding is a winding method in which the moving speed of the traverse when producing the fiber package is constant, and the winding speed (package peripheral speed) when winding the filament is constant. It is necessary to reduce the spindle rotation speed in accordance with the thickening of the winding. As a result, as the filament is wound up, the number of rotations of the spindle per one reciprocation of the traverse decreases with time, and the winding number W continuously decreases gradually. In the case of a constant angle winding, if special conditions exist between the spindle rotation speed and the traverse reciprocating speed due to the change in the winding number over time, so-called ribbons in which filaments are stacked and wound on the fiber package on the same locus. Is formed. When the ribbon is formed, various troubles are caused, for example, the surface of the fiber package is disturbed to cause thread breakage, or the thread protrudes from the fiber package to disturb the winding form and deteriorate the unwinding property.

  On the other hand, the winding number constant winding is, as its name implies, in order to keep the winding number constant, in accordance with the decrease in the spindle rotation speed accompanying the thickening of the fiber package, the traverse moving speed is reduced, so that the traverse per round trip This is a winding system for controlling the ratio of the spindle rotation speeds to a constant. By setting the winding number at the start of winding to a value that does not generate a ribbon in a constant winding number winding, the fiber package can be wound up while avoiding the ribbon generation until the winding ends. In addition, winding with a constant number of windings allows winding the filament onto the package with higher regularity than winding with a constant winding angle. Since it can be wound up and a large amount of filaments can be wound up on one bobbin, it is widely used for thick filaments for industrial use. Furthermore, various techniques have been developed particularly for polyester fibers and polyamide fibers in order to improve the stable winding property in production and the unwinding property in high-order processing.

JP 2009-202986 A JP-A-2003-34466

  General-purpose fibers typified by polyester fibers and polyamide fibers have a high elongation and a low elastic modulus indicating the rigidity of the filaments. Therefore, when a fiber package is produced, a high-hardness fiber package can be obtained by a tightening effect. On the other hand, high-strength fibers typified by aramid fibers and liquid crystal polyester fibers have extremely low elongation compared to general-purpose fibers and have an extremely high initial elastic modulus, so that they do not elastically deform during winding. Therefore, the produced fiber package is soft (has a low hardness) because the effect of tightening it as a general-purpose fiber cannot be obtained. In addition, the filament cuts into the fiber package, resulting in poor unwinding.

  As a method of increasing the fiber package hardness, a method of setting a high winding tension at the time of winding is generally used.However, a high-strength fiber is weak to a force in a direction perpendicular to a fiber axis, and the winding tension is increased. When taken, it is a problem that the quality and quality of the product may be deteriorated such as fluffing due to guide rubbing and physical property deterioration.

  As a technique for improving the unwinding property of the filament, in Patent Document 1, the number of windings is switched in multiple stages during the winding of the filament, and the twill (the locus of the filament wound on the fiber package) from the beginning to the end of the winding is optimized. Have been proposed. However, according to Patent Document 1, when winding a filament having a low elongation and a high elastic modulus, the handling of the package can be easily performed simply by switching the number of windings in multiple stages and controlling the amount of yarn deviation which is a facility setting value at the time of winding. Can not be improved.

  Patent Document 2 proposes a method of stabilizing the winding shape by controlling the yarn width and the yarn deviation ratio on the fiber package when winding the ultra-thick carbon fiber, and improving the unwinding failure. However, Patent Literature 2 is a technique limited to carbon fibers, and high-strength fibers such as polyester fibers and polyamide fibers are such that the fibers themselves are more flexible than carbon fibers, and the total fineness usually produced is several hundred to Thousands of dtex and a total fineness of carbon fiber of 25,000 dtex or more and 100,000 dtex or less are thinner by one digit or more, so the winding conditions and ideas for winding equipment are completely different. Was difficult to apply.

  Therefore, a fiber package composed of a filament having a low elongation and a high modulus of elasticity, which suppresses fluffing and deterioration of physical properties at the time of winding and achieves good handling properties, has not been obtained by the prior art.

  In view of the above, an object of the present invention is to provide a fiber package that solves the above-mentioned problems of the related art and that can significantly improve the handling properties while suppressing the quality and quality deterioration at the time of winding the package. I do.

In order to solve the above problem, the present invention has the following configuration. That is, a fiber package in which a multifilament having an elongation of 5.0% or less and an elastic modulus of 300 cN / dtex or more is wound, the initial twill angle is in the range of 5 to 16 °, and The fiber package is characterized in that it is wound while keeping the interval α between two adjacent yarns in parallel in the range of the following formula (1).
0.60H <α <1.40H (1)
H: Yarn width (μm).

In addition, the present invention provides a multifilament having a tensile elongation of 5.0% or less and an initial elastic modulus of 300 cN / dtex or more, an initial helix angle in the range of 5 to 16 °, and a winding index β of 0.50 to 1 A fiber package manufacturing method characterized in that winding is performed while the winding tension is set to 0.07 to 0.30 cN / dtex.
β = {10 ² × π ^3/2 × D × (W × J−N) × {(ρ)} / {2J × {(T)}} (2)
D: bobbin outer diameter (mm), ρ: specific gravity (g / cm ³ ), W: number of winds, J: number of leads,
N: Number of ribbons, T: Total fineness (dtex)

  The fiber package of the present invention is a package formed by winding a multifilament having a low elongation and a high elastic modulus, while suppressing a decrease in quality and quality at the time of winding, and reducing a package collapse and a handling property at the time of product transport. Can be improved.

  Hereinafter, the fiber package of the present invention and the manufacturing method thereof will be described in detail.

  The method for producing the fiber package of the present invention is not particularly limited as long as the fiber package defined by the present invention is obtained, but a preferred embodiment will be described below.

  The multifilament used in the present invention is composed of a high-strength fiber, that is, a fiber having a low elongation and a high elastic modulus, and may be an aramid fiber, a PBO fiber, a liquid crystal polyester fiber, an ultrahigh molecular weight polyethylene fiber, or the like. Is a multifilament having a tensile elongation of 5.0% or less and an initial elastic modulus of 300 cN / dtex or more.

  Hereinafter, a preferable example in the case of using a liquid crystal polyester fiber will be described. Note that the liquid crystal polyester refers to a polyester that exhibits optical anisotropy (liquid crystallinity) when melted by heating. This can be determined by placing a sample made of liquid crystal polyester on a hot stage, heating and heating under a nitrogen atmosphere, and observing the presence or absence of transmitted light of the sample with a polarizing microscope.

  Examples of the liquid crystal polyester suitable for the present invention include a polymer (a) of an aromatic oxycarboxylic acid, a polymer (b) of an aromatic dicarboxylic acid and an aromatic diol, and a polymer (b) of an aliphatic diol. And the like. Of these, a copolymer (c) and the like, of which a polymer composed only of an aromatic is preferred. Polymers composed only of aromatics exhibit excellent strength and elastic modulus when formed into fibers. In addition, a conventionally known method can be used for the polymerization recipe of the liquid crystal polyester.

  Here, examples of the aromatic oxycarboxylic acid include hydroxybenzoic acid (p-hydroxybenzoic acid and the like), hydroxynaphthoic acid and the like (6-hydroxy-2-naphthoic acid and the like), and alkyl, alkoxy and halogen substitution thereof. Body and the like.

  Examples of the aromatic dicarboxylic acid include, for example, terephthalic acid, isophthalic acid, diphenyldicarboxylic acid, naphthalenedicarboxylic acid, diphenyletherdicarboxylic acid, diphenoxyethanedicarboxylic acid, diphenylethanedicarboxylic acid, and the like, or alkyl, alkoxy, and halogen substitution thereof. Body and the like.

  Further, examples of the aromatic diol include hydroquinone, resorcin, dihydroxybiphenyl, naphthalene diol and the like, and alkyl, alkoxy, and halogen-substituted products thereof. Examples of the aliphatic diol include ethylene glycol, propylene glycol, and butanediol. , Neopentyl glycol and the like.

  Liquid crystal polyesters suitable for the present invention, in addition to the above monomers, can be further copolymerized with other monomers in a range that does not impair the liquid crystallinity, for example, adipic acid, azelaic acid, sebacic acid, dodecanedioic acid, etc. Aliphatic dicarboxylic acids, alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid, polyethers such as polyethylene glycol, polysiloxanes, aromatic iminocarboxylic acids, aromatic diimines, and aromatic hydroxyimines. .

  Preferred examples of the liquid crystal polyester obtained by polymerizing the monomers and the like include (A) a liquid crystal polyester obtained by copolymerizing a p-hydroxybenzoic acid component and 6-hydroxy-2-naphthoic acid component, and (B) a p-hydroxybenzoic acid component. And a liquid crystal polyester obtained by copolymerizing a 4,4′-dihydroxybiphenyl component with an isophthalic acid component and / or a terephthalic acid component, and (C) a p-hydroxybenzoic acid component, a 4,4′-dihydroxybiphenyl component, and an isophthalic acid component. A liquid crystal polyester in which a terephthalic acid component and a hydroquinone component are copolymerized is exemplified.

  In particular, a liquid crystal polyester composed of the structural units (I), (II), (III), (IV) and (V) represented by the following chemical formula is preferable. In the present invention, the structural unit refers to a unit that can form a repeating structure in the main chain of the polymer.

  This combination ensures that the molecular chains have adequate crystallinity and non-linearity, ie, a melting point that can be melt spun. Therefore, at the spinning temperature set between the melting point of the polymer and the pyrolysis temperature, it has good spinning properties, a relatively uniform fiber is obtained in the longitudinal direction, and the fiber has moderate crystallinity. Strength and elastic modulus can be increased.

  Furthermore, it is preferable to combine components composed of a diol that is not bulky and has high linearity, such as the structural units (II) and (III). By combining these components, the molecular chains in the fiber have an ordered and less disordered structure, and the crystallinity is not excessively increased and the interaction in the direction perpendicular to the fiber axis can be maintained. As a result, in addition to high strength and elastic modulus, excellent wear resistance can be obtained.

  The above structural unit (I) is preferably 40 to 85 mol%, more preferably 65 to 80 mol%, and still more preferably 68 to 75 mol%, based on the total of the structural units (I), (II) and (III). . By setting the content in such a range, the crystallinity can be set in an appropriate range, high strength and elastic modulus can be obtained, and the melting point can be in a range in which melt spinning is possible.

  Structural unit (II) is preferably from 60 to 90 mol%, more preferably from 60 to 80 mol%, even more preferably from 65 to 75 mol%, based on the total of structural units (II) and (III). In this range, the crystallinity does not excessively increase and the interaction in the direction perpendicular to the fiber axis can be maintained, so that the wear resistance can be increased.

  The structural unit (IV) is preferably 40 to 95 mol%, more preferably 50 to 90 mol%, and still more preferably 60 to 85 mol%, based on the total of the structural units (IV) and (V). With such a range, the melting point of the polymer is in an appropriate range, and has a good spinning property at a spinning temperature set between the melting point of the polymer and the thermal decomposition temperature, and the single fiber fineness is small, and the longitudinal direction is small. To obtain relatively uniform fibers.

  Preferably, the sum of the structural units (II) and (III) and the sum of (IV) and (V) are substantially equimolar. The term “substantially equimolar” as used herein means that the dioxy unit and the dicarbonyl unit constituting the main chain are present in an equimolar amount, and the terminal structural units are not necessarily equimolar because one of them may be unevenly distributed. Means that you may.

  Particularly preferred ranges of each structural unit of the liquid crystal polyester suitable for the present invention are as follows. The preferred range of each structural unit is a range when the total of the structural units (I), (II), (III), (IV) and (V) is 100 mol%. By adjusting the composition so as to satisfy the above conditions within this range, a liquid crystal polyester fiber suitable for the present invention can be suitably obtained.

Structural unit (I) 45 to 65 mol%
Structural unit (II) 12 to 18 mol%
Structural unit (III) 3 to 10 mol%
Structural unit (IV) 5 to 20 mol%
Structural unit (V) 2 to 15 mol%
The weight average molecular weight (hereinafter, Mw) in terms of polystyrene of the liquid crystal polyester suitable for the present invention is preferably 30,000 or more, more preferably 50,000 or more. By setting the Mw to 30,000 or more, the fiber has an appropriate viscosity at the spinning temperature and can improve the spinnability. The higher the Mw, the higher the strength, elongation and elastic modulus of the obtained fiber. Further, from the viewpoint of improving the fluidity, Mw is preferably less than 250,000, and more preferably less than 150,000. Note that Mw in the present invention is a value obtained by the method described in the examples.

  The melting point of the liquid crystal polyester suitable for the present invention is preferably in the range of 200 to 380 ° C, more preferably 250 to 350 ° C, and still more preferably 290 to 340, from the viewpoint of ease of melt spinning and heat resistance. ° C. In the present invention, the melting point is a value determined by the method described in Examples.

  In the multifilament used in the present invention, other polymers can be added or used in a range not impairing the effects of the present invention. Addition / combination refers to the case where the polymers are mixed with each other, the case where two or more components are used by partially mixing one polymer or a plurality of components with another polymer, or using the entire polymer. Say. Other polymers include, for example, polyesters, vinyl polymers such as polyolefin and polystyrene, polycarbonate, polyamide, polyimide, polyphenylene sulfide, polyphenylene oxide, polysulfone, aromatic polyketone, aliphatic polyketone, semi-aromatic polyesteramide, polyether Polymers such as ether ketone and fluororesin may be added. Polyphenylene sulfide, polyether ether ketone, nylon 6, nylon 66, nylon 46, nylon 6T, nylon 9T, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene na Suitable examples include phthalate, polycyclohexanedimethanol terephthalate, and polyester 99M. In addition, when these polymers are added or used in combination, the melting point is preferably within the melting point of the polymer to be used within ± 30 ° C so as not to impair the spinnability, and the strength and elastic modulus of the obtained fiber are not reduced. Therefore, the amount to be added or used is preferably 50% by weight or less, more preferably 5% by weight or less based on the polymer, and it is most preferable that substantially no other polymer is added or used.

  In the multifilament used in the present invention, within the range not impairing the effects of the present invention, various metal oxides, kaolin, inorganic substances such as silica, coloring agents, matting agents, flame retardants, antioxidants, ultraviolet absorbers, A small amount of additives such as an infrared absorber, a crystal nucleating agent, a fluorescent brightener, a terminal group sealing agent, and a compatibilizer may be contained.

  The single fiber fineness of the multifilament of the present invention is preferably 1 to 100 dtex. Further, it is more preferably 1 to 50 dtex. If the single fiber fineness is less than 1 dtex, yarn breakage is likely to occur due to guide rubbing at the time of winding, and if it is larger than 100 dtex, the single yarn tends to move at the time of winding, and the locus of the multifilament to be wound is not stable. I can't get the desired twill. In the present invention, a quotient obtained by dividing the total fineness by the number of single fibers is defined as a single fiber fineness (dtex).

  The number of single fibers (the number of filaments) of the multifilament of the present invention is preferably from 10 to 500, more preferably from 10 to 400, and still more preferably from 10 to 300. By setting the number of single fibers to 10 to 500, the productivity of multifilaments can be improved, and the multifilaments are sufficiently converged, so that the package can be stably wound. In addition, the multifilament once wound as a package may be separated or combined to form a liquid crystal polyester multifilament having 10 to 500 single fibers. The number of single fibers indicates a value obtained by the method described in the section of Examples.

  The total fineness T of the multifilament of the present invention is preferably from 100 to 3,000 dtex, more preferably from 150 to 2,500 dtex, even more preferably from 200 to 2,000 dtex. When it is set to 100 to 3,000 dtex, it is suitable for use in industrial materials that have high process passability and use a large amount of raw yarn. In addition, the multifilament once wound up as a package is divided or combined to form a multifilament having a total fineness of 100 to 3,000 dtex. The total fineness refers to a value obtained by the method described in the examples.

  The strength of the multifilament of the present invention is preferably at least 15.0 cN / dtex, more preferably at least 17.0 cN / dtex, even more preferably at least 19.0 cN / dtex. When the strength is 15.0 cN / dtex or more, it is suitable for industrial materials that require high strength and light weight. In addition, the strength referred to in the present invention refers to the breaking strength in the measurement of strong elongation and elastic modulus described in the section of Examples.

  The elongation of the multifilament of the present invention is essentially 5.0% or less, preferably 4.5% or less, and more preferably 3.0% or less. The lower limit of the elongation is preferably 1.0% or more. Further, the elastic modulus of the multifilament of the present invention is essential to be 300 cN / dtex or more, preferably 500 cN / dtex or more, more preferably 700 cN / dtex or more. By using a filament in the above range, not only the effect of the present invention is maximized, but also the dimensional change upon receiving stress is small, which is suitable for industrial material applications. The elongation and elastic modulus referred to in the present invention refer to the elongation at break and the elastic modulus in the measurement of strong elongation and elastic modulus described in the section of Examples.

  Further, in the multifilament of the present invention, in order to suppress breakage of a single fiber at the time of winding, and further to improve the processability in the case of a higher-order processed product, it is better to impart a bunching property to the multifilament, For this purpose, it is a preferred embodiment that various fiber oils are provided according to other purposes.

  The oil adhering rate of the fiber oil applied to the multifilament of the present invention is preferably 10.0% by weight or less, and more preferably 8.0% by weight or less when the entire fiber including the oil is 100% by weight. It is preferably at most 6.0% by weight. By setting the content to 10% by weight or less, the trajectory of the multifilament can be stabilized without the filament at the time of winding slipping on the package. The amount of the oil agent attached to the fiber indicates a value determined by the method described in the section of Examples.

  The fiber oil agent may be applied when the fiber package of the present invention is wound, and there is no problem even if the fiber oil agent is applied when unwinding the multifilament once wound as a package and rewinding the package again.

  The method of applying the oil agent to the multifilament while winding the fiber package of the present invention is not a problem with a known method. However, in order to uniformly apply the oil agent to the multifilament, a metal or ceramic kiss roll ( (Oiling roll) is preferred.

  In the multifilament of the present invention, it is preferable to enhance the convergence in order to enhance the controllability at the time of winding, and as a degree thereof, the degree of entanglement is preferably 20 or less, more preferably 10 or less, and more preferably 5 or less. It is more preferred that: The confounding degree referred to in the present invention indicates a value obtained by the method described in the section of Examples. When the entanglement degree is larger than 20, the single fiber in the multifilament is bent, and the physical properties are reduced. The lower limit of the degree of confounding is not particularly limited, but cannot be measured by the method described in the section of Examples, that is, when the weight reaches the lower end, the parakeet between the single fibers is large, Since there is a fear of causing fiber breakage, the content is preferably 1.05 or more. As a method for improving the convergence, there is no problem with a method of applying an oil agent to the yarn as described above, or a method of applying confounding using a known air guide as long as the physical properties are not reduced.

In the fiber package after winding as in the present invention, in order to improve the handling properties while suppressing the deterioration of the quality and quality, as shown in the following formula (1), two multifilaments adjacent to each other in parallel on the fiber package are used. It is essential to control the interval α in the range of 0.6H to 1.4H, and α is more preferably 0.7H to 1.3H, even more preferably 0.8H to 1.2H.
0.60H <α <1.40H (1)
Here, H is the yarn width (μm).

  By controlling the interval α between two multifilaments that are adjacent in parallel on the fiber package within the above range, a package with improved handling properties can be obtained while improving quality and quality. When the interval α between two multifilaments adjacent in parallel on the fiber package is smaller than 0.6H, the overlap between the multifilaments increases, and when the interval α is larger than 1.4H, the gap between the multifilaments increases. The resulting package becomes soft and the handling is significantly reduced. The interval α and the yarn width H between two multifilaments adjacent to each other in parallel on the fiber package indicate values obtained by the method described in the section of Examples.

  The method of winding the multi-filament while maintaining the distance α between two adjacent multi-filaments in parallel on the fiber package at a constant value as described in the present invention is not limited at all. There is a method of controlling a parameter determined by a number to a specific range.

That is, the irreducible fraction consisting of a combination of the denominator J (the number of leads) indicating the ribbon and the numerator N (the number of ribbons) and the yarn displacement ε given to avoid the ribbon, the winding number W is expressed by the following equation ( It is represented by 3).
W = N _sp / N _tr = K + Ws = K + (N ′ + ε) / J = (N + ε) / J (3)
In the above equation (3), N _tr represents a traverse frequency [cpm], N _sp represents a spindle rotation speed [rpm] at that time, K represents an integer number of wind numbers, Ws represents a decimal number of wind numbers, and N = N ′. + K × J.

  At this time, there are theoretically countless combinations of J, N, and ε, but in the present invention, the winding index β expressed by using the number of winds, J, and N among the above parameters is set to a specific range. The distance α between two multifilaments adjacent to each other in parallel on the fiber package is controlled to improve the quality and quality when winding multifilaments with low elongation and high elasticity. It has been found that package collapse and handling can be improved.

That is, in order to obtain the effect of the present invention, the winding index β represented by the following formula (2) is preferably in the range of 0.5 to 1.5, and is preferably in the range of 0.6 to 1.4. The range is more preferable, and the range of 0.7 to 1.3 is still more preferable. By adopting the winding index β falling within the above range, it is possible to stably wind a multifilament having a low elongation and a high elastic modulus without giving an excessive winding tension.
β = {10 ² × π ^3/2 × D × (W × J−N) × {(ρ)} / {2J × {(T)}} (2)
Here, D: bobbin outer diameter (mm), ρ: specific gravity (g / cm ³ ), W: number of winds, J: number of leads, N: number of ribbons, T: total fineness (dtex).

  The number of leads J in the present invention is preferably set such that the relationship with the outer diameter D of the bobbin used for winding is such that D / J is 50 or less, more preferably 40 or less, and still more preferably 30 or less. . When D / J is larger than 50, that is, when the number of leads J is extremely small, yarn slippage at the time of winding is liable to occur, and it becomes difficult to control the locus of the wound filament. The lower limit is not particularly limited as long as it can be wound without breaking the thread.

  In addition, the number of winds described in the present invention is preferably constant from the start to the end of winding for ease of control, but there is no problem even if the number of winds is changed in multiple stages according to an arbitrary winding amount.

  The initial twill angle of the fiber package of the present invention is 5 to 16 °, preferably 5 to 14 °, more preferably 5 to 12 °. If the initial twill angle is outside the above range, thread dropping from the package end surface during winding, that is, so-called twill drop, is likely to occur, and stable winding becomes difficult. Note that the initial twill angle refers to a value obtained by the method described in the section of Examples.

  The winding tension when producing the fiber package of the present invention is preferably 0.07 cN / dtex to 0.30 cN / dtex, more preferably 0.09 cN / dtex to 0.24 cN / dtex, and 0.11 cN / dtex to 0. .22 cN / dtex is most preferred. By setting the winding tension in the above range, yarn slippage during winding is less likely to occur, and the controllability of the winding yarn can be improved. Further, when the winding tension is less than 0.07 cN / dtex, the wound fiber package becomes soft, and the fiber package may be broken during transportation of the product. On the other hand, when the winding tension is larger than 0.30 cN / dtex, fluffing due to rubbing of the guides and deterioration of physical properties are caused.

Winding density of the fiber package of the present invention is preferably 0.70~1.20g / cm ^3, more preferably 0.80~1.20g / cm ^3, 0.90~1.20g / Cm ³ is more preferable. By increasing the density of the fiber package, the hardness of the package is improved, and the package is less likely to collapse during transportation and high-order processing. The winding density indicates a value determined by the method described in the section of Examples.

  In the present invention, the winding speed of the fiber package is preferably 50 m / min or more, more preferably 200 m / min or more, even more preferably 400 m / min or more, in order to improve productivity. Although the upper limit is not particularly limited, the upper limit speed is about 3,000 m / min from the viewpoint of suppressing fluffing and deterioration of physical properties due to multifilament guide rubbing.

  The fiber package of the present invention can be made into a package in the form of cheese, pan, cone or the like using a normal winding machine, but is preferably a cheese wound package in which the winding amount can be set high.

  The material of the winding bobbin used for winding the fiber package of the present invention is not particularly limited, such as a paper material and a resin material, but it is preferable to use a bobbin made of a paper material from the viewpoint of safety associated with bobbin deterioration.

  The fiber package of the present invention is preferably produced in a process before shipping the product, but can be suitably used as a package for an intermediate product in order to improve the workability of manufacturing and transporting the multifilament.

  In the fiber package of the present invention thus obtained, the spacing α between the multifilaments is controlled to a specific value.The fiber package having such a form has improved handleability while improving quality and quality. Therefore, the package can be easily released in the high-order processing, and the process passability can be greatly improved. Thus, the fiber package obtained by controlling the winding method at the time of producing the fiber package can be suitably used in the production of general industrial materials. Examples of general industrial materials include ropes, slings, fishing nets, nets, meshes, woven fabrics, fabrics, sheet materials, belts, tension members, civil engineering and construction materials, sports materials, protective materials, rubber reinforcing materials, and various reinforcing cords. And fiber materials for resin reinforcement, electrical materials, acoustic materials, and the like. In any application, unwinding from a package is generally performed, and the fiber package of the present invention can be particularly preferably used.

  Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. In addition, the definition of the characteristics used in the text of the specification and the examples and the measurement and calculation methods of each physical property are shown below.

(1) Melting point In the differential calorimetry performed by a differential scanning calorimeter (DSC2920 manufactured by TA Instruments), after the observation of the endothermic peak temperature (T _m1 ) observed when the temperature was increased from 50 ° C. to 20 ° C./min. After holding at a temperature of approximately T _m1 + 20 ° C. for 5 minutes, cooling to 50 ° C. at a temperature lowering rate of 20 ° C./min, and an endothermic peak temperature observed when measured again at a temperature rising condition of 20 ° C./min ( T _m2 ) was taken as the melting point. The same operation was performed twice, and the average value of the two operations was defined as the melting point T _m2 (° C.) of the liquid crystal polyester.

(2) Polystyrene equivalent weight average molecular weight (molecular weight)
Using a mixed solvent of pentafluorophenol / chloroform = 35/65 (weight ratio) as a solvent, the liquid crystal polyester is dissolved in the mixed solvent while stirring at 120 ° C. for 20 minutes. At this time, the liquid crystal polyester is adjusted to have a concentration of 0.04% by weight to prepare a sample for GPC measurement. This was measured using a GPC measuring device manufactured by Waters, and Mw was determined in terms of polystyrene. The same operation was performed twice, and the average value of the two operations was defined as the weight average molecular weight (Mw).

Column: ShodexK-G (1)
Shodex K-806M (2)
Shodex K-802 (1)
Detector: Differential refractive index detector RI (Type 2414)
Temperature: 23 ± 2 ° C
Flow rate: 0.8 mL / min. Injection volume: 0.200 mL.

(3) Moisture content Measured by coulometric titration using Karl Fischer moisture meter (AQ-2100) manufactured by Hiranuma Sangyo Co., Ltd. The average of three trials was used.

(4) Oil Agent Concentration When the weight of the solution in which the oil agent was dispersed was W0 and the weight of the oil agent was W1, the product of W1 divided by W0 and the quotient multiplied by 100 was taken as the oil agent concentration (% by weight).

(5) Amount of Oil Agent Adhered After measuring 100 m of fiber with a measuring machine and measuring the weight, the leach was immersed in 100 ml of water and washed for 1 hour using an ultrasonic cleaner. After the ultrasonic cleaning, the moss was dried at a temperature of 60 ° C. for 1 hour, and the weight was measured. % By weight).

(6) Total fineness According to JIS L 1013 (2010) 8.3.1 A method, a positive fineness was measured at a predetermined load of 0.045 cN / dtex to obtain a total fineness (dtex).

(7) Number of single fibers Calculated according to the method of JIS L 1013 (2010) 8.4.

(8) Single fiber fineness A value obtained by dividing the total fineness by the number of single fibers was defined as a single fiber fineness (dtex).

(9) Strong elongation and elastic modulus The strong elongation and elastic modulus of the multifilament before winding under the desired winding conditions are determined by the constant-speed elongation conditions indicated in the JIS L 1013 (2010) 8.5.1 standard time test. Was measured. The sample was measured using Orientec "TENSILON" UCT-100 at a gripping interval (measurement test length) of 250 mm and a tensile speed of 50 mm / min. The strength and elongation were defined as the stress and elongation at break, and the elastic modulus was calculated from the slope at the 0.5% elongation point in the graph of stress and elongation in the tensile test.

(10) Specific Gravity The specific gravity of the multifilament was measured using a specific gravity measuring machine (SGM300P manufactured by Shimadzu Corporation), and the average value of the number of times of execution was used.

(11) Multifilament yarn width: H
Regarding the multifilament, the yarn width in the direction perpendicular to the yarn longitudinal direction was defined as the yarn width H (μm). The yarn width H is an average value of a total of 10 measurement values obtained by sampling the multifilament at 1100 mm and measuring the yarn width at every 100 mm except for both ends. In addition, the yarn width here means the yarn width in the direction perpendicular to the longitudinal direction of the yarn when the multifilament is allowed to stand on a flat surface without slack.

(12) Spacing α between two multifilaments
The multifilament was unwound from the wound fiber package until the difference between the bobbin outer diameter D (mm) and the package outer diameter PD (mm) became about 20 mm (the thickness of the yarn layer on the bobbin was about 10 mm). Then, the surface of the fiber package was imaged using a camera while enlarging the yarn width to the extent that the yarn width could be confirmed, and the ruler was imaged so that the dimensions could be understood at the same distance. With respect to two adjacent multifilaments among the multifilaments arranged at the center of the image, the distance (μm) from one end of one multifilament in the yarn width direction to one end of the other multifilament was measured. . On the other hand, the distance between the two multifilaments was calculated from the size and ratio of the imaged ruler. The imaging location was randomly selected, the measurement was performed 10 times, and the average was taken as the interval α between the two multifilaments.

(13) Entanglement degree It was measured according to the method for measuring the degree of confounding described in JIS-L1013 (2010) 8.15. A load of 100 g is hung below the fiber sample, and the sample is suspended vertically. A hook with a load of 10 g was inserted into the upper part of the sample, and the degree of entanglement was determined from the descent distance (mm) until the hook was stopped by entanglement of the yarn by the following equation.

Degree of confounding = 1000 / hook descent distance (mm)
The measurement was performed 10 times, and the average value was defined as the degree of confounding.

(14) Winding index β
It was calculated using the following equation (2).
β = {10 ² × π ^3/2 × D × (W × J−N) × {(ρ)} / {2J × {(T)}} (2)
D: bobbin outer diameter (mm), ρ: specific gravity (g / cm ³ ), W: number of winds, J: number of leads,
N: number of ribbons, T: total fineness (dtex).

(15) Initial Twill Angle The initial twill angle was calculated by the following equation.
Initial twill angle (°) = tan ⁻¹ {(2 × Tr / (π × D × W)} × 180 / π
Tr: traverse length (mm), D: bobbin outer diameter (mm), W: wind number.

(16) Winding Density The winding density, which is an index of the package hardness, was calculated by the following equation using the wound fiber package.
Winding density = G / [{π / 4 × (PD ² −D ² )} × T]
G: fiber weight (g), PD: fiber package outer diameter (mm), D: bobbin outer diameter (mm),
Winding width: T (mm).

(17) Fluff The surface of the fiber package after winding under desired winding conditions is visually checked, and no fluff (fine hair-like yarn end) generated when the multifilament breaks into a single fiber or becomes fibrillated.た, 〇 when a part of the fluff was confirmed, and × when the whole part of the fluff was found, ◎ and 〇 were accepted.

(18) Degree of Strength Reduction The strength of the multifilament after winding is the same as that of the multifilament unwound from the fiber package in the same manner as the “strong elongation / elastic modulus” described above, JIS L 1013 (2010) 8.5.1. The measurement was performed under constant-speed elongation conditions shown in the standard time test. The sample was measured using Orientec "TENSILON" UCT-100 at a gripping interval (measurement test length) of 250 mm and a tensile speed of 50 mm / min. The strength and elongation were defined as the stress and elongation at break, and the elastic modulus was calculated from the slope at the 0.5% elongation point in the graph of stress and elongation in the tensile test. The strength reduction rate after rewinding was calculated using the following equation.
Strength reduction rate (%) = 100− (strength after rewinding / strength before rewinding) × 100
If it is less than 5%, it is evaluated as ◎, if it is 5% or more and less than 10%, it is evaluated as x if it is 10% or more.

(19) Evaluation of Process Passability While controlling the obtained fiber package so as to have a constant tension, the fiber package is mounted on a feeder capable of taking out and unwinding, and the fiber is fed in the horizontal direction (fiber circling direction) at 400 m / min for 30 minutes. It was unwrapped. During the 30 minutes, ◎ the one that could be unwound for 30 minutes without any trouble, ◎ the one that could be unwound for 30 minutes while the multifilament bite into the fiber package, etc. The unwinding property was evaluated as △ when a stop occurred due to the penetration of the multifilament or the like, × when the thread breakage occurred, and ◎ and 合格 as acceptable.

[Example 1]
870 parts by weight of p-hydroxybenzoic acid, 327 parts by weight of 4,4'-dihydroxybiphenyl, 157 parts by weight of isophthalic acid, 292 parts by weight of terephthalic acid, 89 parts by weight of hydroquinone were placed in a 5 L reaction vessel equipped with a stirring blade and a distillation tube. And 1,433 parts by weight of acetic anhydride (1.08 equivalents of the total of phenolic hydroxyl groups) were charged, and the mixture was heated from room temperature to 145 ° C. for 30 minutes while stirring under a nitrogen gas atmosphere, and then reacted at 145 ° C. for 2 hours. Thereafter, the temperature was raised to 330 ° C. in 4 hours. The polymerization temperature was maintained at 330 ° C., the pressure was reduced to 1.0 mmHg (133 Pa) in 1.5 hours, the reaction was continued for another 20 minutes, and the polycondensation was completed when a predetermined torque was reached. Next, the inside of the reaction vessel was pressurized to 1.0 kg / cm ² (0.1 MPa), and the polymer was discharged into a strand through a die having one circular discharge port with a diameter of 10 mm, and pelletized by a cutter.

  This liquid crystal polyester is composed of 54 mol% of p-hydroxybenzoic acid units, 16 mol% of 4,4′-dihydroxybiphenyl units, 8 mol% of isophthalic acid units, 15 mol% of terephthalic acid units, and 7 mol% of hydroquinone units. The melting point was 315 ° C., and the melt viscosity measured at a temperature of 330 ° C. using a Koka flow tester at a shear rate of 1,000 / sec was 30 Pa · sec. Further, Mw was 145,000.

  Using this liquid crystal polyester, vacuum drying was performed at 120 ° C. for 12 hours to remove water and oligomers. At this time, the water content of the liquid crystal polyester was 50 ppm. The dried liquid crystal polyester was melt-extruded with a single-screw extruder (heater temperature: 290 to 340 ° C.), and the polymer was supplied to a spinning pack while being measured by a gear pump. At this time, the spinning temperature from the extruder outlet to the spinning pack was 335 ° C. In the spinning pack, the polymer is filtered using a metal nonwoven fabric filter having a filtration accuracy of 15 μm, and a discharge rate of 100 g / min (0.33 g / single hole) is discharged from a die having 300 holes having a hole diameter of 0.13 mm and a land length of 0.26 mm. Minutes), the polymer was discharged.

  An oil agent (a polydimethylsiloxane (SH200-350cSt, manufactured by Dow Corning Toray Co., Ltd., SH200-350cSt) is a 5.0% by weight water emulsion) is applied to the liquid crystal polyester multifilament cooled and solidified at room temperature immediately after the discharge using an oiling roller. The 300 filaments were pulled together with a Nelson roller at 600 m / min. The spinning draft at this time is 29.3. The amount of the oil agent attached was 1.5% by weight. The multifilament picked up by the Nelson roller was wound as it was into a cheese shape using a blade traverse type winder via a dancer arm. The spinnability in the melt spinning was good, and a liquid crystal polyester multifilament having a total fineness of 1670 dtex and a single fiber fineness of 5.6 dtex could be stably spun without breaking, and a 4.0 kg wound package yarn was obtained. .

From this spinning package, the fiber is unwound in the longitudinal direction (perpendicular to the circumferential direction of the fiber), and the speed is kept constant at 400 m / min by a winding machine (SSP-WV8P type precision winder manufactured by Kozu Seisakusho). A rewind was performed. In addition, a stainless steel bobbin was used for the core material of the rewinding, the tension at the time of rewinding was set to 0.005 cN / dtex, the winding density was set to 0.50 g / cm ^3, and the winding amount was set to 4.0 kg. Further, the package shape was a tapered end winding with a taper angle of 65 °.

  The temperature of the obtained rewound sample was raised from room temperature to 240 ° C. using a closed oven, kept at 240 ° C. for 3 hours, raised to 290 ° C., and further kept at 290 ° C. for 20 hours. To perform solid phase polymerization. The atmosphere in the solid-state polymerization was supplied with dehumidified nitrogen at a flow rate of 100 L / min, and exhausted from an exhaust port so that the inside of the refrigerator was not pressurized.

  The solid-state polymerization package obtained in this way is attached to a feeding device that can be rotated by an inverter motor, and the fiber is unwound while sending the fiber in a lateral direction (fiber circling direction) at 200 m / min. Using a cam traverse type winder via a dancer arm, the film was wound into a cheese shape under the conditions of a winding tension of 0.15 cN / dtex and a wind number of 11.16808. The bobbin used has an outer diameter D of 89 mm and a winding width of 305 mm. The results obtained in Example 1 are as shown in Table 1.

[Examples 2 to 5]
A fiber package was obtained in the same manner as in Example 1 except that the number of winds was changed.

[Examples 6 and 7]
At the time of melt spinning, a spinning pack having 75 holes with a hole diameter of 0.13 mm and a land length of 0.26 mm is used, and the discharge amount of the pack is changed to 34 g / min, or a spinning pack having 150 holes is used, and the discharge amount of the pack is 66 g. / Min, and multifilaments having different total fineness were collected, and a fiber package was obtained in the same manner as in Example 1 except that the number of winds and the winding tension were changed.

[Examples 8 to 9]
An entangled air guide was installed immediately before winding, and the fiber package was wound in the same manner as in Example 1 except that winding was performed while imparting entanglement with compressed air of 0.40 MPa in Example 8 and 0.6 MPa in Example 9. Obtained.
Table 1 shows the conditions and fiber properties of Examples 2 to 9.

[Comparative Examples 1 to 3]
A fiber package was obtained in the same manner as in Example 1 except that the number of winds was changed.

[Comparative Examples 4 and 5]
A fiber package was obtained in the same manner as in Example 1 except that the winding tension was changed.
Table 2 shows the fiber properties of Comparative Examples 1 to 5.

  As is clear from Examples 1 to 9 in Table 1, it is understood that the spacing α of the multifilaments on the package can be controlled by controlling the winding conditions at the time of winding the package, particularly the winder ratio. By controlling the interval α to a specific range in this manner, it is possible to greatly improve the unwinding property while suppressing a decrease in quality and quality evaluated by the fluff and strength reduction rate of the multifilament after winding. did it. In particular, by controlling the interval α in the range of 0.8H to 1.2H, the unwinding property was further improved. In such a fiber package, the unwinding property of the package at the time of high-order processing is remarkably improved, and the process passability is remarkably increased as compared with the conventional technology, so that it can be suitably used for general industrial material applications.

  On the other hand, as is apparent from Comparative Examples 1 to 5 in Table 2, when the winding conditions when winding the package, especially when the wind ratio is not appropriate, the interval α cannot be controlled to a specific range, and the unwinding property is poor. It has deteriorated, or the quality or quality has deteriorated. As described above, when the interval α is out of the range from 0.6H to 1.4H, the effects intended by the present invention cannot be achieved.

  The liquid crystal polyester multifilament of the present invention has an excellent unwinding property when unwinding a package, and has an appropriate package hardness, so that it is preferably used for general industrial material applications such as high-strength ropes and slings. Can be.

Claims (7)

A package in which a multifilament having a tensile elongation of 5.0% or less and an initial modulus of elasticity of 300 cN / dtex or more is wound, the initial helix angle is in the range of 5 to 16 °, and the package is parallel on the package. Wherein the interval α between two multifilaments adjacent to the fiber is in the range of the following formula (1).
0.60H <α <1.40H (1)
H: Yarn width (μm)   The fiber package according to claim 1, wherein the degree of entanglement of the multifilament is 20 or less. The fiber package according to claim 1, wherein the winding density of the package is 0.70 to 1.20 g / cm ³ .   The fiber package according to any one of claims 1 to 3, wherein the multifilament is a liquid crystal polyester multifilament.   (A) a liquid crystal polyester obtained by copolymerizing a p-hydroxybenzoic acid component and 6-hydroxy-2-naphthoic acid component; (B) a p-hydroxybenzoic acid component, a 4,4′-dihydroxybiphenyl component and isophthalic acid (C) p-hydroxybenzoic acid component, 4,4'-dihydroxybiphenyl component, isophthalic acid component, terephthalic acid component, and hydroquinone component are copolymerized. The fiber package according to claim 4, wherein the fiber package is at least one selected from liquid crystal polyester. A multifilament having a tensile elongation of 5.0% or less and an initial elastic modulus of 300 cN / dtex or more has an initial helix angle in the range of 5 to 16 ° and a winding index β represented by the following formula (2) of 0.50. A method for producing a fiber package, wherein the winding is performed so as to fall within a range of from 1.50 to 1.50 and a winding tension of 0.07 to 0.30 cN / dtex.
β = {10 ² × π ^3/2 × D × (W × J−N) × {(ρ)} / {2J × {(T)}} (2)
D: bobbin outer diameter (mm), ρ: specific gravity (g / cm ³ ), W: number of winds, J: number of leads,
N: Number of ribbons, T: Total fineness (dtex) The method for producing a fiber package according to claim 6, wherein the winding is performed so that an interval α between two multifilaments adjacent to each other in parallel on the package is in the range of the following expression (1).
0.60H <α <1.40H (1)
H: Yarn width (μm)