JPH039215B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polyester multifilament yarn for warp of textiles, and in particular, a polyester multifilament yarn for warp of textiles which has excellent abrasion resistance and is suitable as a raw yarn for warp in non-twisted and glue-free weaving using a water jet loom. Regarding filament yarn. Conventionally, studies have been conducted to subject polyester multifilament yarns to fluid entanglement treatment to create interlaced yarns between the filaments and to weave them as warp yarns in a water jet loom without twisting or sizing. Generally, when the degree of entanglement of interlaced yarn is improved, the convergence is improved and the weavability is improved to some extent, so studies have focused on improving the degree of entanglement. For example, Japanese Patent Publication No. 37-1175 and Japanese Patent Publication No. 47-43787 disclose techniques for improving the degree of entanglement of multifilament yarns by improving the performance of a fluid entangling nozzle. Japanese Patent Publication No. 55-20018 and Japanese Patent Publication No. 56-9975 disclose a technology that improves the entangling property by regulating the front and rear guide positions of the fluid entangling treatment nozzle and devising the fluid entangling treatment area. has been done. Although these nozzle improvements and entanglement treatment method improvements are effective in improving the cohesiveness of multifilament yarns, good weavability cannot be obtained by these improvements alone. In other words, when weaving in a water jet loom using interlaced yarns with only improved cohesiveness as warp yarns, single yarn breakage may occur due to friction between the warp yarns and between the warp yarns and the metal parts of the welded yarns due to the movement of the heddles and reeds. However, fluff occurs, and
There is a problem that the weaving machine may open improperly and eventually stop, so it is necessary to take wear resistance into account. As a method for improving the abrasion resistance of interlaced yarns, for example, Japanese Patent Publication No. 50-28533 and Japanese Patent Publication No. 52-39935 disclose a method of imparting slipperiness to interlaced yarns using an oil agent to improve abrasion resistance. However, in these methods, a lubricating oil is applied to the undrawn yarn before spinning and winding, so it is difficult to control the amount of oil deposited, and the amount of deposit varies in the longitudinal direction of the yarn, resulting in poor yarn quality. The disadvantage is that the abrasion resistance in the longitudinal direction tends to change easily, and the abrasion resistance is maintained only by the oil coating on the yarn surface. Polyester multifilament yarn consisting of fine denier filaments, polyester multifilament yarn consisting of filaments with a deformed cross section, especially polyester multifilament yarn consisting of filaments of 2.5 denier or less and having a deformed cross section such as a trilobal cross section. However, there is a problem in that it is difficult to obtain a warp yarn that is practical for use in waterjet loom weaving. The purpose of the present invention is to solve the problem of poor weavability due to low abrasion resistance, which is a drawback of conventional interlaced polyester multifilament yarns.
A polyester multifilament that solves the difficulty of weaving a multifilament yarn consisting of fine denier filaments of 2.5 denier or less and deformed cross-section filaments as warp yarns in a water jet loom, and achieves good weavability. It's about providing the thread. That is, the present invention is a polyester multifilament yarn in which linear filaments are interlaced and the yarn is also linear, and the strength-elongation curve (hereinafter referred to as the S-S curve) of the yarn is
, the ratio B/A of the gradient A at 0% elongation and the smallest gradient B in the range of elongation corresponding to 2 g/d strength from 0% elongation is 0.1 to 0.4, and the strength is
3.5g/d or more, elongation is 25% or more, single yarn fineness is 2.5
This is a polyester multifilament yarn for use in warp yarns for weaving and weaving waterjet looms with no twist and no glue, which is characterized by having a denier or less and an abrasion resistance of 2000 cycles or more. The polyester multifilament yarn for textile warp of the present invention is interlaced, and it is sufficient if the degree of entanglement is the same as that of ordinary interlaced yarn, but if it is less than 10, it will easily come apart during the warping process and have poor handling. Furthermore, the weavability is likely to be poor.
It is preferably 10 or more, more preferably 15 or more. If the degree of entanglement is too large, interlace unevenness will occur in the fabric, resulting in defects, so it is preferably 100 or less, more preferably 90 or less. Next, the SS curve, which is a characteristic of the polyester multifilament yarn for weaving warp of the present invention, will be explained. Figure 1 shows the S-S curve 1 of one example of the multifilament yarn of the present invention and the curve 1 of the polyester multifilament yarn with ordinary interlacing.
It is shown in comparison with example SS curve 2. The SS curve of the multifilament yarn of the present invention has a substantially inverted S-shape, and the gradient of strength with respect to elongation is 1.5 to 2 g/
It is characterized by a large drop near d. Here, in the multifilament yarn of the present invention, there is a very small gradient A of strength with respect to elongation at an elongation rate of 0% and an elongation (Y in Fig. 1) corresponding to an elongation of 0% to 2 g/d strength. The ratio B/A of B (the slope at point X in FIG. 1) needs to be between 0.1 and 0.4. The ratio B/A in the S-S curve of ordinary interlaced polyester multifilament yarn is about 0.5 to 0.8, and in this range, the abrasion resistance is low and good weaving can be achieved even when used for the warp of textiles. Sex is hard to come by. Ratio B/A is 0.4
If it is larger, the abrasion resistance will be low and the effect of improving weavability will be small.It must be 0.4 or less, and preferably 0.35 or less. Ratio B/A becomes too small 0.1
If it is less than 0.1, it will tend to stretch during weaving and cause vertical warps, so it must be 0.1 or more.
It is preferably 0.15 or more. Gradient A indicates the elasticity of the multifilament yarn, and if it is too small, it will cause deformation during the weaving process and cause uneven streaks and uneven dyeing on the fabric.
It is preferable to set it to 0.5 (g/d/%) or more,
More preferably 0.6 (g/d/%) or more. In addition, the higher the strength and elongation, the better the abrasion resistance, and the strength needs to be 3.5g/d or more, and 4.0g/d or more.
d or more is preferable, elongation is required to be 25% or more, and 30
% or more is preferable. The multifilament yarn of the present invention exhibits a linear shape even as a multifilament yarn in which straight filaments are intertwined, like a normal interlace yarn. However, in interlaced yarns using yarns with deformed cross-sections such as trilobal cross-sections, when fluid entangling treatment is performed under relaxing conditions after drawing, entangling is performed with sagging occurring due to the difference in drawing strain between filaments, resulting in sagging. It has the disadvantage that it tends to become an interlaced yarn. If an interlace yarn with sagging is used as a warp, the sagging portion will be intensively drawn out due to friction between the warps and the warp and the metal part of the welded thread during weaving, reducing the cohesiveness and abrasion resistance of the interlace yarn and impairing weaving properties. The decline is significant. Here, the multifilament yarn of the present invention can be made into a multifilament yarn that is substantially free from sagging, and is particularly preferably applicable to yarns with a deformed cross section. The smaller the number of slumps in the interlace, the more effective it is in improving wear resistance and, in turn, the more effective it is in improving the weaving properties. This means that there is no sagging, and it is more preferably 0.05 co/m or less, and even more preferably 0.01 co/m or less. In addition, the higher the abrasion resistance of the interlaced yarn, the more effective it is in improving weaving properties, and the abrasion resistance is preferably 2000 times or more when measured using the measurement method described below.
More preferably 2500 times or more, and even more preferably 3000 times or more. The polyester constituting the multifilament yarn of the present invention is made from terephthalic acid or its lower alkyl derivative (diester of an alkanol having 1 to 4 carbon atoms) and ethylene glycol, or from terephthalic acid or its lower alkyl derivative and ethylene glycol. At least one polyester structural unit obtained from at least one other component, or from bis-2-hydroxyethyl terephthalate or a low polymer thereof, or from bis-2-hydroxyethyl terephthalate and at least one other component. It is a polyester that is 70% polyethylene terephthalate. The polyester also contains pigments such as carbon black, phthalocyanine, titanium oxide, and silicic anhydride.
Phosphorus compounds such as phosphoric acid, phosphorous acid, triphenyl phosphate, trimethyl phosphate, triphenyl phosphate, etc. may be added. The filaments of the multifilament yarn may have either a round cross section or a deformed cross section, but as described above, a large effect is exhibited in a deformed cross section. In general, the finer the filaments of multifilament yarn, the lower the weavability.
The multifilament yarn of the present invention can maintain good weavability even with a denier of 2.5 denier or less, which was conventionally difficult to weave without twisting or sizing.
It is applicable to yarns with a denier or less, and is particularly effective in multifilament yarns that are 2.5 denier or less and are made of filaments with a deformed cross section. The multifilament yarn may be a mixed yarn of filaments having different cross-sectional shapes and finenesses. If the heat shrinkage rate of the multifilament yarn is too low, it will be difficult to obtain a good texture when finishing the fabric, so the boiling water shrinkage rate is preferably 2% or more.
It is more preferably 4% or more, and even more preferably 5% or more. If the heat shrinkage rate is too large, streaks and uneven dyeing are likely to occur during dyeing and finishing of the fabric, so the boiling water shrinkage rate is preferably 15% or less, and more preferably 12% or less. Next, a preferred method for producing the multifilament yarn of the present invention will be described. The basic method of producing a multifilament yarn of the present invention is to draw an undrawn polyester multifilament yarn, then perform a relaxation heat treatment and then a fluid entanglement treatment, or perform a fluid entanglement treatment and then a relaxation heat treatment. A preferred manufacturing method will be explained below with reference to FIG. After feeding the polyester multifilament undrawn yarn 3 to the feed roller 4 pressed by the nip roller,
Stretching is performed between roller 4 and unheated or heated rollers 5 and 6, and then relaxation heat treatment is performed between rollers 6 and 8 using a heating body 7 such as a hot plate that is heated above the glass transition point of the drawn yarn. do. Next, the yarn is subjected to a fluid entanglement treatment by a fluid entanglement treatment nozzle 9 under relaxing conditions between rollers 8 and 10 to form a winding yarn 11 as an interlaced yarn. The fluid entanglement treatment nozzle is generally called an interlace nozzle, and for example,
Nozzles described in Japanese Patent Publication No. 12230, Japanese Patent Publication No. 37-1175, etc. can be used. Almost the same multifilament yarn can be obtained by performing fluid entanglement treatment and then relaxing heat treatment, but multifilament yarns that have been subjected to fluid entanglement and are bundled have low running stability in the relaxation heat treatment region and cannot be used at high relaxation rates. It is more effective to perform relaxation heat treatment followed by fluid entanglement treatment as shown in Figure 2, as running stability is likely to decrease, the stagnation reduction effect of relaxation heat treatment is small, and heat treatment at a higher temperature and for a longer period of time is required. be. In the stretching region between the rollers 4 and 6, known stretching methods such as using heating pins, hot plates, etc. can be applied. In the relaxation heat treatment region, the higher the relaxation rate, the greater the heat treatment effect.In order to keep the gradient ratio B/A in the SS curve of the obtained multifilament yarn to 0.4 or less, the relaxation rate is preferably 0.2% or more, and preferably 0.4% or more. is more preferable. However, if the relaxation rate is too large, running stability and spinning properties will be reduced, so it is preferably 5% or less, more preferably 3% or less.
The higher the temperature of the relax heat treatment, the greater the heat treatment effect, and in order to keep the gradient ratio B/A in the SS curve of the obtained multifilament yarn to 0.4 or less, the relax heat treatment temperature is preferably higher than the glass transition point, and is applied during stretching. It is more preferable to set the heat treatment temperature to the above heat treatment temperature or higher. However, if the temperature becomes too high and causes fusion between filaments, the texture of the fabric will become rough and hard, so it is preferable to keep the temperature within a range that does not cause fusion. The heat supply body in the relax heat treatment is not limited to the hot plate, but can also heat the roller 8. The fluid entanglement treatment region is preferably under relaxing conditions, and the relaxation rate is preferably 2% or less, more preferably 1.5% or less in order to prevent sagging in the resulting multifilament yarn. A preferred example of manufacturing the multifilament yarn of the present invention has been described with reference to FIG. 2, but the drawing, relaxation heat treatment, and fluid entanglement treatment may be performed separately, and there is no particular limitation. Furthermore, if heat treatment is applied to the multifilament yarn in the longitudinal direction and/or between the filaments using Relax heat treatment, if the resulting multifilament yarn is used to make a fabric, it is likely to cause defects such as uneven dyeing, uneven scratching, shrinkage, and patchiness. Preferably, a substantially uniform heat treatment is applied. The characteristics in the S-S curve of the multifilament yarn of the present invention correspond to the fact that it was subjected to relaxation heat treatment, and as a result of the relaxation heat treatment, the degree of orientation of the amorphous region is reduced, and the abrasion resistance is improved. This improvement corresponds to improvement in weavability. Further, the ability to substantially eliminate sagging in the multifilament yarn of the present invention is an effect of relax heat treatment, and from this point of view as well, it is effective in improving weavability. As explained above, the polyester multifilament yarn for textile warp of the present invention has excellent abrasion resistance when woven without twisting or sizing as the warp, especially when weaving using a water jet loom, and therefore provides good weaving. Show your gender. It is particularly applicable to multifilament yarns composed of filaments of 2.5 denier or less, which have conventionally been difficult to weave without twisting or sizing. In addition, it can be preferably applied to multifilament yarns composed of filaments with modified cross sections. The present invention will be specifically explained below with reference to Examples. Here, the definitions and measurement methods of the relaxation rate, relaxation conditions, abrasion resistance, degree of entanglement, and slump number S-S curve are as follows. (Relaxation rate, relaxation conditions) When running the yarn in one processing area, when the surface speed of the yarn feeding roller is V ₁ and the surface speed of the take-out roller is V ₂ , relaxation rate (%) = V ₁ - V ₂ /V ₁ ×100 If the value obtained is positive, it corresponds to the relaxation condition. (Abrasion Resistance) The measuring method will be explained with reference to FIG. 2, which is a schematic plan view of a measuring device (a yarn friction binding force tester manufactured by Toyo Seiki Seisakusho). This device is mounted on the left and right vibrating tables 20 to 25, respectively, as shown in the figure, with thread fixing terminals 14 and 1.
9. Rotation guides 15 to 18 are installed. The vibration tables 20, 22, and 24 move simultaneously in the same direction,
The vibrating tables 21, 23, and 25 can be moved simultaneously in opposite directions. The moving distance is 3cm on each side.
It is. There is a thread path regulation rotation guide 26 in the center. In the part that becomes the thread path on the right side, there are free rotating bodies 27 to 31 with grooves, and the free rotating bodies are connected to the support body 32.
Load 33 (0.2g/1 thread per thread) in the right direction through
d). Sample yarn 13
Tie one end to the thread fixed end 14 and pass the thread through to the other thread fixed end 19 as shown in the figure. However, in the twisting section 34, the yarn is twisted 2.5 times, and the twisting section angle θ is 45 degrees. After setting in this condition, move the vibrating table at a speed of 100 times per minute to squeeze the string. Measure the number of strokes until the thread breaks, and use the average value of the 10 measurements as the measured value. (Degree of entanglement) The measurement method will be explained with reference to FIG. The thread 38 to be measured is hung on the grooved pulley 37 supported by the shaft 36 as shown in the figure, and the same initial load 39, 4 is applied to both ends of the thread.
Multiply by 0. Here, the initial load is the total denier of the yarn x
The amount is 0.4g. Next, a cotton needle 42 of an appropriate thickness is fixed approximately midway between the thread separation point of the pulley and the load locking part.
A constant load 41 of single yarn denier x 2 g is applied to the initial load 39 on the opposite side from where the cotton needle 42 was inserted. The thread has a constant load of 4
1, the cotton needle 42 moves to the left until it catches the intertwined part and stops. Next, the constant load 41 attached to the initial load 39 is removed and placed on the constant load 40 on the right side, so that the thread moves to the right side due to the constant load 41, and the intertwined part is caught on the needle 42 and stopped naturally.
The moving length l (cm) of the yarn at this time is determined, and the degree of entanglement is determined by the following formula.The degree of entanglement is determined by the following formula. Degree of confounding = 100/l 50 randomly selected samples were measured in the same way and the average value is shown. (Number of sagging) Using a fuzz counting device manufactured by Toray Industries, Inc., with an S-type detection part attached, for sagging that is 0.1 mm or more larger than the surface of the yarn bundle, the length of 100 m per sample was measured under a yarn tension of 0.1 g/d. Measure 10 times at a yarn speed of 50 m/min, calculate the average value, and use the value converted per 1 m as the sagging number. (S-S curve) Using an Instron type measuring device, the sample length is 20 cm,
Measurements are made at a tensile speed of 10 cm/min and recorded on a suitable recording paper. Read the required characteristics from the recorded SS curve. When setting the sample in an Instron-type measuring device, apply a load of 0.1 g/d to the lower end of the sample and set it so that the thread does not come loose. The slope A at 0% elongation is the slope of the tangent to the S-S curve at 0% elongation, and the slope B is the smallest in the elongation range from 0% elongation to 2 g/d strength.
is the slope of the tangent line showing the smallest slope among all the tangent lines on the SS curve in the range of elongation corresponding to 0% elongation to 2 g/d strength. This measurement
Characteristics are expressed by the average value of repeated tests. However, the fineness used to calculate the strength shall be the denier of the sample supplied for this measurement. Example 1 241 denier with an intrinsic viscosity of 0.65 measured in orthochlorophenol at 25°C and without a dissipating agent.
Using the apparatus shown in Fig. 2, a polyethylene terephthalate undrawn yarn having a Y-shaped cross section of 36 filaments was
The surface temperature of roller 5 was 87°C, the surface speed of roller 6 was 600 m/min, and the stretching ratio between rollers 4 and 6 was 3.3 times. Relaxation heat treatment was performed. The heating element 7 was a 30 cm hot plate. Then roller 8,
The fluid entanglement treatment was carried out for 10 minutes using the fluid entanglement treatment nozzle 9 at a relaxation rate of 0.6% and an air pressure of 4 kg/cm ² (G). The fluid entanglement treatment nozzle used was similar to the nozzle described in Japanese Patent Publication No. 36-12230. Table 1 shows the yarn properties of the obtained multifilament yarn.
Also listed. All of them were interlaced yarns with virtually no sagging and excellent abrasion resistance. These No. 1 to 5 multifilament yarns are warped without twisting or sizing, and are made using ordinary polyethylene terephthalate 75 denier 36 filaments as wefts in a water jet room at a warp density of 92 threads/inch and a weft density of 90 threads. Weaved taffeta in book/inch. As shown in Table 1, warp breakage during weaving was small and good, and Nos. 2 to 5, in which the gradient ratio B/A in the SS curve was 0.35 or less, were particularly good. The resulting fabrics were subjected to a conventional polyester filament dyeing process, and Nos. 1 to 4 were good products with no fabric defects. Slope ratio B/
No. 5, which has a small A of 0.10, had a slight vertical scratch. Comparative Example 1 Processing was carried out under the same conditions as in Example 1, except that the conditions for the relax heat treatment were set to Nos. 6 and 7 in Table 1. Table 1 shows the yarn properties of the obtained multifilament yarn. The obtained multifilament yarn was woven and dyed according to Example 1. No. 6, which has a large slope ratio B/A in the S-S curve, has a large number of talumi,
The abrasion resistance was low and the weavability was poor. The fabric using No. 7, in which the slope ratio B/A was too small, had strong vertical wrinkles and was a poor product. Comparative Example 2 Processing was carried out in accordance with Example 1, except that the heating element 7 and roller 8 in FIG. 2 were removed. The properties of the obtained multifilament yarn are shown in Table 1, and the slope ratio B/A in the SS curve was large, the number of sagging was large, and the abrasion resistance was low. Although weaving was carried out according to Example 1, the weavability was poor. 【table】

[Brief explanation of the drawing]

Figure 1 shows the S-
Schematic explanatory diagram for explaining the characteristics of the S curve, 2nd
The figures show an example of a process by which the multifilament yarn of the present invention can be preferably manufactured. FIG. 3 is a schematic diagram of an abrasion resistance measuring device, and FIG. 4 is a schematic diagram of an entanglement degree measuring device. 1...S-S of the multifilament yarn of the present invention
Curve example, 2...S-S of normal polyester multifilament yarn with interlacing
Examples of curves, 3... Polyester multifilament undrawn yarn, 4, 5, 6, 8, 10... Roller, 7... Heating body, 9... Fluid entangling treatment nozzle,
11... Winding thread.

Claims (1)

[Claims] 1. A polyester multifilament yarn in which linear filaments are interlaced and the yarn is also linear, and the strength-elongation curve of the yarn has a slope A at 0% elongation and the elongation. From 0%
Even in the elongation range corresponding to 2g/d strength, the ratio B/A of the smallest slope B is 0.1 to 0.4, and the strength is 3.5g/d
As described above, a polyester multifilament yarn for use in non-twisted, non-sizing waterjet loom weaving warps, characterized by having an elongation of 25% or more, a single yarn fineness of 2.5 denier or less, and an abrasion resistance of 2000 cycles or more. 2. The polyester multifilament yarn for use in non-twisted, non-sizing waterjet loom weaving warps according to claim 1, which has substantially no sagging on the surface of the yarn.