JP4852374B2 - Separating polyester filament and palatable beverage extraction filter obtained therefrom - Google Patents

Description

The present invention relates to a polyester filament suitable for a palatable beverage extraction filter and a palatable beverage extraction filter using the same. In particular, it is a polyester that does not substantially contain a heavy metal having a specific gravity of 5 g / cm ³ or more as a catalyst for producing polyester, and is copolymerized with isophthalic acid or the like at a ratio of 20 mol% or less of the polymer component, and has a melting point of 200 ° C. to Polyester filament that is an irregular cross-section filament in the range of 240 ° C., and the monofilament after splitting is excellent in safety as a palatability beverage extraction filter, and can be used as a palatability beverage extraction filter excellent in moldability in fabrics, The present invention also relates to a palatable beverage extraction filter comprising the monofilament.

  Conventionally, palatable beverage extraction filters, particularly palatable beverage extraction filters used for black tea and the like, are mainly used for paper, polypropylene or polyethylene nonwoven fabrics. There is an increasing demand for a taste-extracting beverage extraction bag made of textiles as a luxury taste product that can see tea leaves such as black tea. As the structure of such a woven fabric, for the purpose of easily seeing tea leaves such as black tea in the palatable beverage extraction bag and preventing the tea leaves inside from coming out, a shear woven fabric with monofilaments made into a plain weave is the mainstream.

  Nylon is the mainstream material fiber for palatable beverage extraction filters used in palatable beverage extraction bags for textiles, and the filter or extraction bag made of nylon fibers has excellent three-dimensional shape retention and is deformed It is also rich in elastic resilience and has an excellent texture in terms of the softness of the fabric. However, an extraction bag made of nylon fiber has a dimensional change due to swelling of the nylon fiber in boiling water, a color change due to absorption of a taste beverage component, and liquid drainage when the nylon extraction bag is taken out from the container after extraction. It has been pointed out before that problems such as badness and inferior settling properties of the extraction bag in hot water due to the specific gravity of nylon.

For the purpose of improving such problems of nylon fibers, a taste beverage extraction filter using polyester fibers has been studied. Patent No. 3459951 has a core / sheath double structure having a melting point difference of 100 ° C. or more. A fabric-friendly palatable beverage extraction filter made of polyester fibers has been proposed. However, this technique does not consider a metal catalyst used as a catalyst for producing polyester in polyester fibers, and environmental safety of a palatable beverage extraction filter using polyester fibers is required.
Japanese Patent No. 3459951

  The main object of the present invention is to provide a multifilament for splitting that can be made as a monopolyester filament for a taste-extracting beverage extraction filter that is excellent in safety as a taste-extracting beverage extraction filter and excellent in moldability in textiles. is there. Another object of the present invention is to provide a monofilament for a tasteful beverage extraction filter obtained by splitting the multifilament, and a further object is to provide a tasteful beverage extraction filter made of a woven fabric of the monofilament. is there.

  As a result of intensive studies in view of the above-described conventional techniques, the inventors of the present invention have a multifilament suitable for use as a taste-extracting beverage extraction filter according to the present invention, a monofilament for taste-satisfying beverage extraction filter obtained by separating the multifilament, and And it came to complete the palatability drink extraction filter using it.

That is, minute繊用multifilament of the present invention, 80 mol% of the polymer repeating units constituting the fibers Ri ethylene terephthalate units der, isophthalic acid is copolymerized at a ratio of 5 to 20 mole percent of total acid component A multifilament made of polyester having a true specific gravity of 5.0 or more and a metal element content of 0.5 ppm by weight or less, and the following (1) to ( 5 ) It is a polyester multifilament for splitting suitable for use in a palatable beverage extraction filter characterized by satisfying the above conditions simultaneously.
(1) The fiber cross section is flat (2) The elongation is 20 to 40% (3) The single yarn fineness is 10 to 40 dtex (4) The number of filaments is 4 or more and 20 or less There is
(5) Melting | fusing point of a fiber exists in the range of 200-240 degreeC.

  Furthermore, the polyester multifilament for splitting of the present invention has a shape in which the flat shape in the fiber cross section is such that 3-6 pieces of the round cross section single yarn are linearly joined in the long axis direction, The ratio of the maximum diameter length A (major axis) to the maximum diameter length B (minor axis) orthogonal to the major axis, that is, the flatness A / B is preferably 3-6.

かつ、該ポリエステル中のチタン金属元素含有量（Ｔｉ）及びリン元素含有量（Ｐ）が、下記数式（１）を満足するように合成されたものであることが好ましい。

And the copolymer polyester which comprises this polyester multifilament for splitting uses the phosphonate compound represented by the following general formula (I) at the time of the synthesis | combination,

And it is preferable that the titanium metal element content (Ti) and phosphorus element content (P) in this polyester are synthesize | combined so that the following numerical formula (1) may be satisfied.

Moreover, the monofilament for palatability | flavor extraction filters of this invention is the polyester monotel filament for palatability | flavor extraction filters obtained by splitting the polyester multifilament for the segregation of the present invention as mentioned above.
And a palatability drink extraction filter is a palatability drink extraction filter which consists of textiles which contain the above-mentioned polyester monofilament as at least one of a warp or a weft.

  According to the present invention, it is possible to provide a polyester filament for a palatability beverage extraction filter which is excellent in environmental safety as a palatability beverage extraction filter and excellent in moldability and texture of an extraction bag made of fabric. .

  In the polyester multifilament for splitting of the present invention and the monofilament obtained by splitting it, the polymer constituting the fiber is composed of at least 80 mol% of ethylene terephthalate units and a proportion of 20 mol% or less. In addition, it is necessary that the PET copolymer polyester containing other polymer repeating units has a metal element content of true specific gravity of 5.0 or more of 0 to 0.5 ppm by weight.

しかも、該ポリエステル中のチタン（Ｔｉ）及びリン（Ｐ）含有量が下記数式（１）を満足するように合成されていることが好ましい。

More specifically, it is important from the viewpoint of environmental safety that the content of a metal element having a specific gravity of 5.0 or more, particularly antimony, germanium, etc., is very low as 0.5 ppm by weight or less. As the catalyst for production, trimellitic acid titanium is preferably used. Further, as a phosphorus compound, a phosphonate compound represented by the following general formula (I) is used,

Moreover, it is preferable that the polyester is synthesized so that the titanium (Ti) and phosphorus (P) contents in the polyester satisfy the following mathematical formula (1).

In the multifilament of the present invention, a polyethylene terephthalate (PET) copolymer polyester is used as a fiber-forming polymer. Among them, isophthalic acid is copolymerized in a proportion of 5 to 20 mol% of all acid components constituting the polymer. And a copolyester having a melting point in the range of 200 to 240 ° C. is required .

  A filter made of a homopolyester fiber (melting point: 255 to 260 ° C.) has poor weldability by an ultrasonic sealing method or a heat sealing method used when forming an extraction bag with a woven fabric, compared to a filter made of nylon fiber. In addition, there is a difficulty in easily peeling once welded, and this is also the reason why many polyester fibers have not been used in this field. However, polyethylene terephthalate fiber in which isophthalic acid is copolymerized in the above proportion so that the melting point of the fiber is in the range of 200 to 240 ° C. can be processed to the same extent as nylon fiber by the ultrasonic sealing method. . However, when the melting point of the fiber exceeds 240 ° C., the weldability by the ultrasonic sealing method or the heat sealing method is poor, and it is easy to peel off even once welded. Since unwinding of the yarn occurs, it is not suitable for use as an extraction bag. On the other hand, when the melting point is less than 220 ° C., the weldability by the ultrasonic sealing method or the heat sealing method is high, and it is difficult to peel off even after being once welded, but the strength of the fiber is weak, and the yarn breakage in the fiber separation process Increases the process passability. Therefore, the melting point of the fiber is preferably 200 to 240 ° C, particularly preferably 200 to 220 ° C.

  In the multifilament for splitting of the present invention, the fineness and physical properties are also important. First, it is necessary that the elongation is in the range of 20 to 40%, and preferably 25 to 35%. If the elongation is less than 20%, the yarn breakage in the spinning process and the yarn breakage in the splitting process increase, and the process passability deteriorates. On the other hand, when the elongation exceeds 40%, an unstretched portion due to stretch spots is generated, and the dyeing quality is remarkably lowered by deepening the portion.

  Further, the single yarn fineness after splitting of the polyester multifilament for splitting manufactured according to the present invention needs to be 10 to 40 dtex, and preferably 20 to 30 dtex. If the single yarn fineness is smaller than the above lower limit, it becomes difficult to separate the fibers, and conversely, if the single yarn fineness is larger than the upper limit, the package loses its shape or goes out during winding and the process passability is remarkably deteriorated. In addition, the number of single filaments of the multifilament yarn is preferably 4 to 20, particularly 4 to 10 from the viewpoint of securing the separation property and the process passability in the separation step.

  In the present invention, the cross-section of each single yarn (single fiber) is a flat cross-section, and the flat shape is a shape such that 3 to 6 round cross-section single yarns are joined linearly in the long axis direction. It is preferable to have. FIG. 2 shows an example of such a flat cross-sectional shape. In the above-mentioned flat cross-section fiber, the flatness A / B represented by the ratio of the length A (long axis) of the maximum diameter of the cross section to the length B (short axis) of the maximum diameter orthogonal to the long axis is 3 to 3. 6 is particularly preferred. In the present invention, by making such a unique fiber cross-sectional shape, the number of contact points of the fiber cross section at the intersection of the warp and weft in the woven fabric becomes larger than that in the case of a round cross-section (circular cross-section) fiber. The weldability by the ultrasonic sealing method and the heat sealing method used when forming the extraction bag is improved. In addition, since it is remarkably softer than fabrics made of ordinary polyester fibers and has an excellent texture, it has physical properties suitable for palatable beverage extraction filters or extraction bags. Furthermore, the woven fabric composed of flat cross-section fibers has a smaller mesh opening than the woven fabric of the round cross-section fibers even with the same fabric density configuration as the round cross-section fibers. Performance is improved. In addition, there is an effect that tea leaves such as black tea in the extraction bag are hardly spilled into hot water.

  The intrinsic viscosity (ο-chlorophenol, measured at 35 ° C.) of the polyester constituting the multifilament in the present invention is preferably in the range of 0.40 to 0.80, more preferably 0.45 to 0.75, particularly 0. A range of .50 to 0.70 is preferred. An intrinsic viscosity of less than 0.40 is not preferable because the strength of the fiber is insufficient. On the other hand, if the intrinsic viscosity exceeds 0.80, it is uneconomical because it is necessary to excessively increase the intrinsic viscosity of the raw material polymer.

  The polyester multifilament in the present invention, if necessary, a small amount of additives in the fiber, such as lubricants, pigments, dyes, antioxidants, solid phase polymerization accelerators, fluorescent whitening agents, antistatic agents, antibacterial agents, An ultraviolet absorber, a light stabilizer, a heat stabilizer, a light-shielding agent, a matting agent, and the like may be included.

  Moreover, the monofilament for palatability | flavor extraction filter which concerns on this invention is what divided the polyester multifilaments as mentioned above by a conventionally well-known method, Therefore, the fineness is a single yarn fineness of 10-40 decitex. At this time, the multifilament for splitting may be split with a flat yarn as it is, or may be split after false twisting. The monofilaments thus split can be woven using warps and / or wefts, or both, and can be suitably used as a liquor extraction filter as a fabric. Moreover, it can be set as a favorable taste drink extraction bag by shape | molding this in a bag as needed. In any case, the resulting woven fabric composed of monofilaments is useful as a filter for black tea, green tea, and other favorite beverages. In particular, round (circular) cross-section fibers are used for warps and the above-mentioned flat cross-section fibers are used for wefts. It is preferable to use a woven fabric structure using A plain woven fabric is generally suitable as the woven fabric structure, but it may be a twill woven fabric or other structures. The obtained woven fabric is cut into an appropriate size, and a predetermined portion is fused by a method such as ultrasonic sealing or heat sealing to form a bag.

  The method for producing the polyester multifilament for splitting of the present invention is not particularly limited. For example, as shown in FIG. 1, a melted multifilament discharged from the spinneret 1 is provided directly under the spinneret. After passing through a heat-retaining region 10 having a length of 50 to 200 mm held at an atmospheric temperature of ˜200 ° C. to suppress rapid cooling, the molten multifilament is rapidly cooled with cooling air 11 to be converted into a solid multifilament, and an oiling roller 2 and oiling in a monofilament state, passed through the yarn dividing guide 3, and then wound around the first godet roller 4 and its separate roller 5 which were converged and heated to 70 ° C to 120 ° C in a multifilament state. Then, it is taken up at a speed of 500 to 2000 m / min, and is continuously taken up without being wound up. Wrapped around the second godet roller 6 rotating at a faster peripheral speed than the first godet roller 4 and its separate roller 7, between the first godet roller 4 and the second godet roller 6. It is possible to employ a method in which the film is stretched 2.0 to 5.0 times and then wound by the winder 8 at a lower speed than the second godet roller 6 to obtain a multifilament package.

  The polyester multifilament for splitting of the present invention is supplied to the splitting process as it is and used after splitting, or after being crimped by false twisting and splitting and used for a filter.

  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) Analysis of metal components having a specific gravity of 5.0 or more in the fiber (content of metal elements having a true specific gravity of 5.0 or more)
The fiber sample is mixed with ammonium sulfate, sulfuric acid, nitric acid and perchloric acid, wet-decomposed at about 300 ° C for 9 hours, diluted with distilled water, qualitatively analyzed using a scientific ICP emission analyzer (JY170 ULTRACE), and specific gravity The presence or absence of 5.0 or more metal elements was confirmed. And the element content was shown about the metal element by which presence of 1 weight ppm or more was confirmed.
(2) Elongation Based on JIS-L-1013, it was measured at a gripping interval of 20 cm and a tensile speed of 20 cm / min using Tensilon manufactured by Orientec Co., Ltd., which is a constant speed extension tensile tester.
(3) Intrinsic viscosity The intrinsic viscosity of the polyester polymer was determined from the viscosity value measured at 35 ° C for an orthochlorophenol solution.
(4) Split yarn rate (%)
The percentage of multifilaments for splitting that can be split at a speed of 500m / min without breaking the yarn into a single yarn of a 10kg drum package that winds up polyester multifilaments for splitting (%) The split amount of monofilament is 1 kg. The pass / fail criterion was 80% or higher.
(5) Interstitial weldability of fabric during heat treatment (200 ° C.), ultrasonic sealability when forming extraction bag Evaluation was performed by a test by an extraction bag manufacturing specialist.
(6) Texture The quality was judged by a sensory test by a textile specialist.

[Example 1]
Polyethylene terephthalate having an intrinsic viscosity of 0.650, containing 5 mmol% of titanium trimetate as a titanium compound as a polymerization catalyst and 30 mmol% of triethylphosphonoacetate as a phosphorus compound, and copolymerizing an isophthalic acid component at a ratio of 17 mol% of the polymer component. The pellets of isophthalate copolymer (PETI) were dried at 140 ° C. for 5 hours. Thereafter, in the melt spinning process, the discharge amount per single discharge hole is set at a polymer discharge temperature of 280 ° C. from two spinnerets in which 5 holes each having a discharge hole diameter of 0.55 mm are arranged concentrically. Extruded to 8.0 g / min, oiled in the form of a monofilament, monofilaments discharged from two spinnerets were combined into a multifilament with 10 filaments, and heated to 100 ° C. After making 16 turns with a godet roller and pulling it at 700 m / min, the second godet roller makes 10 turns at a speed 4.4 times that of the first godet roller, and after drawing 4.4 times, the number of filaments is 10 It was wound up as a multifilament of books.
Under these conditions, two types of multifilaments of flat cross-section fibers in which round cross-section fibers and four round cross-section single yarns were joined linearly in the major axis direction with a flatness of 4 were produced. Table 1 shows the physical properties of the obtained multifilaments.

Next, for each multifilament, each of the multifilaments was split, and the resulting monofilament was used to form a warp as a round cross-section fiber and a weft as a flat cross-section fiber to obtain a plain fabric [taffeta, 27dTex monofilament, number of driven (97 × 97 / inch)] Weaving, refining, washing with water, drying, heat treatment in heated air (200 ° C) with tension applied, and giving a light weld to the intersection of yarns An extraction bag was formed by the sealing method.
As shown in Table 1, the multifilaments of the flat cross-section fibers in which the round cross-section fibers wound under these conditions and four round cross-section single yarns joined in a straight line in the major axis direction with a flatness of 4 are both finely divided. It was good. Further, the above-mentioned plain woven fabric has good weldability by the ultrasonic sealing method, and the texture of the woven fabric is soft and suitable for a palatability beverage extraction filter or an extraction bag.

[Comparative Example 1]
An extraction bag was formed under the same conditions as in Example 1 except that round cross-section fibers were used for both the warp and the weft. The results are also shown in Table 1.

[Comparative Example 2]
Under the same conditions as in Example 1, except that 5 mmol% of titanium trimetate as the titanium compound and 30 mmol% of triethylphosphonoacetate as the phosphorus compound were used as the polymerization catalyst and polyethylene terephthalate pellets (PET) having an intrinsic viscosity of 0.650 were used. An extraction bag was formed. The results are also shown in Table 1.

  As is clear from Table 1, the fabric of Example 1 using a circular melting point for the warp and a flat cross section for the weft at a fiber melting point of 205 ° C. has good ultrasonic sealing properties and soft texture as an extraction bag. It was good. In contrast, the woven fabric of Comparative Example 1 having a fiber melting point of 205 ° C. and having a round cross section for both warp and weft has several unwinding after ultrasonic sealing, and it can be said that the ultrasonic sealing property is good. Furthermore, it was difficult to say that the texture as an extraction bag was hard and good. Further, the fabric of Comparative Example 2 using a PET filament having a fiber melting point of 256 ° C. and having a round cross-section for warp and a flat cross-section for weft has a relatively soft texture, but has a poor ultrasonic seal as an extraction bag. Was unusable.

  The polyester filament of the present invention is useful as a fabric-preferred beverage extraction filter material, and particularly useful for an extraction bag used for tea or the like.

It is a schematic diagram which shows the outline of the spinning machine which implements this invention. It is a schematic diagram which shows an example of the fiber cross section of the multifilament for splitting of this invention.

Explanation of symbols

1: Spinneret 2: Oiling roller 3: Thread separation guide 4: First godet roller 5: First separate roller 6: Second godet roller 7: Second separate roller 8: Winder 9: Multifilament package 10 : Thermal insulation area 11: Cooling air

Claims (5)

80 mol% of the polymer repeating units constituting the fibers Ri ethylene terephthalate units der, isophthalic acid is composed of copolyester copolymerized in a proportion of 5 to 20 mole percent of total acid component, a true specific gravity of 5. A multifilament composed of a polyester having a content of 0 or more metal elements of 0.5 ppm by weight or less, and satisfying the following conditions (1) to ( 5 ) simultaneously: Splitting polyester multifilament suitable for use as a beverage extract filter.
(1) The fiber cross section is flat (2) The elongation is 20 to 40% (3) The single yarn fineness is 10 to 40 dtex (4) The number of filaments is 4 or more and 20 or less There is
(5) Melting | fusing point of a fiber exists in the range of 200-240 degreeC. The flat shape in the cross section of the fiber has a shape such that 3 to 6 single yarns of a round cross section are linearly joined in the long axis direction, and the length A (long axis) of the maximum diameter of the flat cross section fiber and the length The polyester multifilament for splitting according to claim 1, wherein the flatness A / B expressed by the ratio of the length B (short axis) of the maximum diameter orthogonal to the axis is 3-6. The copolyester constituting the fiber is represented by the following general formula (I) at the time of synthesis.

And the titanium metal element content (Ti) and phosphorus element content (P) in the polyester are represented by the following formula (1):

The polyester multifilament for splitting according to claim 1 or 2, which is synthesized so as to satisfy A polyester monotel filament for a taste-extracting beverage extraction filter obtained by splitting the polyester multifilament for splitting according to any one of claims 1 to 3. A palatable beverage extraction filter comprising a woven fabric containing at least the polyester monotel filament according to claim 4 as warp or weft.

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