JP4563849B2 - Synthetic fiber spinning direct drawing apparatus and method - Google Patents

Description

  The present invention relates to the accumulation and abrasion of local dirt on the surface of a drawing roll in a direct spinning apparatus for spinning synthetic fibers, i.e., a direct spinning apparatus for directly drawing and winding a spun yarn. The present invention relates to an apparatus and a method for directly spinning a synthetic fiber, which can prevent and improve spinning productivity and product quality.

  In the production of yarns by the melt spinning method of synthetic fibers typified by polyamide and polyester, especially industrial synthetic fibers, the spinning direct drawing method, that is, the melt-extruded yarn is taken up by using a plurality of goded rolls. A yarn for industrial materials having a high tensile strength is produced by heat stretching under magnification and high tension.

  At that time, a part of the oligomer component generated from the yarn during melt spinning and a part of the spinning finish applied before stretching accumulated as dirt in the yarn running part on the surface of the drawing roll, and this dirt was heated to a high temperature. On the surface of the drawing roll, it tartars due to heat, so that the dirt is accelerated and fixed, and the yarn goes up and runs on it, causing fluctuations in the tension of the yarn, causing unevenness in the yarn, Problems such as thread breakage occur.

  In addition, when producing high tensile strength fibers by the direct spinning method, the tension of the stretched yarn applied to the draw roll is very large. When the spinning winder is operated for a long time, the yarn on the take-up roll is There is also a problem that the wear of the strip running part becomes very fast.

  In order to suppress such deterioration of product quality and productivity due to dirt and wear on the drawing roll, Patent Document 1 provides a yarn path guide for yarns traveling at 1600 to 3500 m / min at the final roll speed. A technique is disclosed in which the running position of the yarn on the take-up roll that is run by swinging the guide is swung in the direction of the rotation axis to prevent sticking due to the dispersion of dirt on the take-up roll. However, in this method, the yarn tension at the member that swings the yarn becomes too large, which may cause yarn fluff.

  In Patent Document 2, a yarn path guide that regulates the running position of the yarn is installed before or between the drawing rolls, and the running yarn reciprocates the yarn path guide in the rotation axis direction of the drawing roll. Thus, a method and apparatus for traversing on stretching rolls is disclosed.

  However, in this method, since the reciprocating motion is performed while pushing the yarn with the yarn path guide, the problem arises that the yarn width becomes narrow on the drawing roll and the single yarns overlap, and the temperature of the drawing roll is uniformly applied to the yarn. Since it is not transmitted, there is a problem that fluff is generated or yarn breakage is generated in the production of a synthetic fiber having a large number of single yarns and high strength.

  In Patent Document 3, when producing a fibrous material having a strength of about 7.5 cN / dtex and a fineness of 1100 dtex, the Nelson angle of the drawing roll is periodically changed by periodically circularly moving the drawing Nelson roller, A method for traversing the yarn in the direction of the rotation axis of the drawing roll has been proposed. In this method, since the yarn is reciprocated while sliding on the surface of the Nelson roller moving in an arc, the phenomenon that the width of the yarn is narrowed can be avoided. For this reason, there is a problem that the gantry vibrates particularly in a high-speed region, resulting in a problem that the production amount is restricted, and a large installation space is required, so that the capital investment is increased.

  Also, when drawing multiple yarns, when the yarn is traversed on a Nelson roller that moves in an arc, the operation of widening and narrowing the interval between the yarns is repeated depending on the Nelson angle. When it becomes narrower, problems such as contact between the yarns occur, so it is necessary to install a guide etc. that regulates the interval between the yarns just before the Nelson roller, but there is a high tension area in the drawing process When the guide is installed in the guide, there is a problem that a single yarn breakage occurs due to wear of the guide or the like, and a problem that the yarn breaks easily occurs.

Furthermore, when the Nelson roller that periodically changes the Nelson angle is wrapped four times or more, in a region where the Nelson angle is large, the phenomenon that the yarn twists and the yarn width decreases as the number of wraps increases, Since the temperature is not uniformly transmitted to the yarn, there is a problem that fluff is generated especially in the production of a synthetic fiber having a large number of single yarns and high strength, and there is a problem that yarn breakage occurs, and resistance as a yarn path is small. There has been a demand for a swinging method in which the yarn width is difficult to change and the yarn position on the take-up roll is smoothly changed.
US Pat. No. 5,183,620 JP-A-8-170215 JP 2004-137644 A

  An object of the present invention is a production method in which a synthetic fiber yarn is drawn and heat-treated by a drawing roll and continuously wound, and the quality and productivity generated by dirt accumulated in the drawing roll and wear of the drawing roll by long-time operation. In a synthetic fiber spinning direct drawing apparatus that could not be solved by the prior art in order to suppress the decrease of the yarn, while maintaining the width of the sending yarn constant, and even with the multi-yarn spinning direct drawing, the yarn An object of the present invention is to provide a compact and inexpensive synthetic fiber spinning direct drawing apparatus and method capable of traversing the yarn in the direction of the drawing roll rotation axis while avoiding contact between the yarns.

  In order to solve the above problems, the present inventors have provided a separator roll that swirls in a conical shape before the first drawing roll having a low yarn tension, so that the yarn width can be kept constant and It has been found that even in the case of direct drawing of spinning, it is possible to traverse the yarn in the direction of the drawing roll rotation axis while avoiding contact between the yarns.

That is, the invention claimed in the present application is as follows.
(1) Synthetic fiber spinning direct drawing apparatus in which melt-spun synthetic fiber yarns are guided to a plurality of drawing rolls via undrawn yarn take-up rolls, drawn in multiple stages with the drawing rolls, heat-treated, and continuously wound. The apparatus for directly drawing a synthetic fiber according to claim 1, wherein the undrawn yarn take-up roll is provided with a rotatable separator roll and means for rotating the separator roll in a conical shape.
(2) In the apparatus according to (1), the separator roll is swung in a conical shape, and the yarn on the drawing roll guided through the separator roll is traversed in the direction of the drawing roll rotation axis. Synthetic fiber spinning direct drawing method.

  According to the present invention, deposits such as heat-modified products such as finishing agents are prevented from being deposited on the stretched Nelson roll, and not only can the stretched Nelson roll be maintained in the initial state for a long time, but also at low cost. Although it is a compact device, it is possible to increase the operating rate and production efficiency by reducing the number of stops for removing deposits, and to eliminate defects such as yarn breakage and fluff generation. It is possible to produce an excellent synthetic fiber.

  In particular, the direct spinning method of the present invention is characterized in that one or more Nelson rollers are used in the production of fibers for industrial materials composed of nylon 6, nylon 66, polyester, etc. having a fineness of 100 dtex or more and a fiber strength of 5.5 cN / dtex or more. This is effective in the case where the surface temperature is 150 ° C. or higher and two or more yarns are simultaneously drawn by direct spinning. When the fineness increases, the amount of oil brought into the Nelson roller increases, and when the temperature of the Nelson roller exceeds 150 ° C, the thermal denaturation of the oil is accelerated. When the drawing tension is high as in the case of fibers, roll stains can be prevented and a high-quality yarn can be obtained.

Next, details of the present invention will be described.
FIG. AD is a schematic diagram showing examples of the installation location of the separator roll and the yarn threading method in the spinning direct drawing apparatus of the present invention. The apparatus of the present invention guides a melt-spun synthetic fiber yarn 12 to a plurality of stretching rolls 3 (a) and (b) via an unstretched take-up roll 2, and stretches and heat-treats in multiple stages with the stretching roll. In a continuous winding apparatus using a winding apparatus (not shown), a separator roll 1 is provided in front of the stretching roll 3 (b), and the separator roll 1 is rotated conically around its rotation axis. Is.

Synthetic fibers in the present invention can be polyester, polyamide, and polyolefin, which are generally capable of melt spinning. The spinning direct drawing method is a method in which a thermoplastic resin is melt-extruded, the yarn is cooled, and then drawn using a multi-stage take-up roll and wound up, and a known spinning finish is added or entangled. Of course, it may be. The yarn produced according to the present invention can usually have a fineness of 5 to 2000 dtex and a single yarn fineness of about 0.1 to 20 dtex, and is appropriately set depending on the yarn to be produced.
The take-up roll speed in the spinning of the present invention is usually about 3000 to 6000 m / min, but there is no particular problem even if it is higher or lower.

  The present invention is characterized in that a specific separator roll 1 is incorporated in an apparatus used for the spinning direct drawing method. As shown in FIGS. 1A and 1B, the yarn 12 is guided to the separator roll 1 after being taken by the undrawn yarn take-up roll 2 even if it is taken up by the undrawn yarn take-up roll 2 through the separator roll 1. In other words, the undrawn yarn take-up roll 2 and the separator roll 1 are led to the first drawing roll 3 after being shouldered or wrapped. In the case of wrapping, it is preferable to use 3 wraps or less in order to prevent the yarn from being twisted and the yarn width from becoming too small. Further, when the multi-yarn spinning is directly stretched, a fixed guide for restricting the interval between the yarns before the yarn enters the separator roll 1 may be provided.

  In addition, the method of turning the separator roll 1 in a conical shape is not particularly limited. When a separator roll is used as a free roll by inserting a bearing between the separator roll 1 and the separator roll shaft, for example, FIG. A method of rotating the separator roll shaft 4 by bending the separator roll shaft 4 as shown in FIG. 2A by a certain turning angle (θ) with respect to the rotation axis of the separator roll turning drive motor 5, and FIG. As shown in B, there is a method in which the end of the separator roll shaft is fixed to the separator roll turning disk 6 so as to have a fixed turning angle (θ) and the disk is rotated. When the separator roll 1 and the separator roll shaft 4 are used in a fixed manner, FIG. As shown in C, the rotation drive motor 7 of the separator roll 1 may be fixed to the separator roll turning disk so as to have a fixed turning angle (θ), and the turning disk 6 may be rotated.

  Further, the diameter of the separator roll may be determined according to the installation space of the equipment, and is not particularly limited. However, when the separator roll is used as a free roll, in order to make the rotational resistance as small as possible, It is desirable to make it as small as possible as long as the separator roll shaft does not bend due to the tension of. A desirable range of the separator roll diameter is 5 mm or more and 50 mm or less.

  Moreover, the rotational speed of this separator roll is 0.1-20 rpm, Preferably it is the range of 0.5-15 rpm. If the swirl speed exceeds 20 rpm, the traverse speed of the yarn on the drawing roll increases, so that the yarn breaks apart and contact between single yarns occurs, and fluff and yarn breakage are likely to occur. In this direct spinning, contact between yarns occurs and yarn breakage tends to occur. On the other hand, when the rotational speed is less than 0.1 rpm, the traverse speed of the yarn on the drawing roll is slow, so that the dirt accumulated on the drawing roll cannot be efficiently removed.

  Further, the turning angle (θ) of the separator roll is in the range of 1 to 10 degrees, preferably 1.5 to 8 degrees. When the turning angle is less than 1 degree, the reciprocating motion width of the yarn on the drawing roll is small, and the effect of suppressing the drawing roll dirt cannot be expected. On the other hand, if the turning angle exceeds 10 degrees, the traverse width of the yarn on the separator roll becomes large, so that the traverse state of the yarn is not stable, the yarn is scattered and contact between the single yarns occurs. In the case where yarn breakage is likely to occur, or in the case of direct spinning of multiple yarns, problems such as contact between yarns leading to yarn breakage occur. Furthermore, since the traverse width of the yarn on the drawing roll also increases at the same time, the length of the drawing roll is required more than necessary.

  Further, this separator roll has a mirror surface or a satin finish, and has a surface roughness Ra in the range of 0.01 to 6 microns, preferably 0.1 to 5 microns. When the surface roughness of the separator roll exceeds 6 microns, the yarn on the separator roll sways greatly with slight fluctuations in tension, causing the yarn to scatter on the drawing roll, causing contact between the single yarns, Problems such as thread breakage are likely to occur, and yarn breaks due to contact between yarns. The measurable range of the surface roughness of the separator roll is 0.1 micron or more. However, if the surface roughness is too small, the yarn is too gripped on the surface of the separator roll by the driving method of the separator roll, and the yarn separation becomes worse. There is a case.

Next, the present invention will be specifically described with reference to examples.
First, a method for evaluating each characteristic in the embodiment will be described.
[Surface roughness]
The surface roughness of the separator roll was measured using a surf coder SE1700α manufactured by Kosaka Laboratories in accordance with JIS 82 and other parameter settings of JIS B601-1982. The measurement conditions are a stylus curvature radius of 2 μm, a feed rate of 0.5 mm / second, a cut-off λc of 0.8 mm, λf10λc, and an evaluation length of 5 mm. The roughness of the separator roll surface was calculated from the measured cross-sectional curve.

[Stretched roll dirt]
The state of the yarn path on the drawn Nelson roller 48 hours after the start of spinning was visually observed, and it was judged that ○ was slightly soiled, Δ was soiled, × was soiled, and yarn was shaken greatly.
[Thread break]
The number of yarn breakage 48 hours after the start of spinning is shown.
[Number of fuzz]
The number of fluff at 48 hours from the start of spinning was counted by a fluff detection device, and the number of fluff per 100 m was expressed.

[Example 1]
Four yarns were simultaneously spun from a nylon 66 polymer having a 95% formic acid relative viscosity (VR) of 80 using the apparatus shown in FIG.
The spinning temperature was 300 ° C. After spinning from the die, cold air of about 20 ° C. was blown to solidify by cooling. Thereafter, an oil agent is applied by the oiling roll 8, taken up by the undrawn yarn take-up roll 2, and the obtained undrawn yarn is taken up through the separator roll 1 without winding up the undrawn yarn take-up roll 3 (b), first Pre-stretching is performed 1.09 times between the stretching rolls 3 (a), and then stretched 2.7 times between the first stretching roll 3 (a) and the second stretching roll 9, and the second stretching roll 9, The film is stretched twice between the three stretching rolls 10 and relaxed by 1.0% between the third stretching roll 10 and the fourth stretching roll 11, and simultaneously four yarns with a winder at a speed of 2500 m / min. By winding, a drawn yarn having a total fineness of 470 dtex, a filament count of 70, and a fiber strength of 8.5 cN / dtex was obtained.

  As for the temperature of each roll, the unstretched yarn take-up roll 3 (b) is not heated, the first stretch roll 3 (a) is 50 ° C, the second stretch roll 9 is 200 ° C, the third stretch roll 10 is 230 ° C, The 4 stretch drawing roll 11 was 150 degreeC. In addition, the number of yarns wound on each roll is such that the undrawn yarn take-up roll 2 and the separator roll 1 are shoulders, the first drawing roll 3 (a) is 3 times, the second drawing roll 9 is 5 times, The stretching roll 10 was 8 times and the fourth stretching roll 11 was 5 times. Moreover, the fluff detection apparatus was installed between the 4th extending | stretching roll 11 and the winder, the number was counted, and the frequency | count of thread breakage was also evaluated.

  As a mechanism for rotating the separator roll 1, FIG. A separator roll shaft 4 as shown in A was bent at a certain turning angle (θ) with respect to the rotating shaft 5 of the motor and turned at a turning speed of 1 rpm. Moreover, this turning angle was made into five levels of 0.5, 1.5 degrees, 5 degrees, 8 degrees, and 15 degrees. The separator roll 1 was used as a free roll by inserting a bearing between a separator roll having a diameter of 30 mm and a shaft.

Further, the surface roughness of the separator roll 1 was 1.5 microns Ra, and a fixed guide for restricting the yarn interval was inserted immediately before the separator roll in order to simultaneously spin four yarns.
These conditions and roller dirt, single yarn breakage, yarn breakage, and the evaluation results of the yarn width on the second drawing roll are also shown in Table 1.

  As is clear from Table 1, when the turning angle of the separator roll is 0.5 degrees (Comparative Example 1-1), removal of dirt accumulated in the drawing roll is insufficient, and the number of fluffs and the number of yarn breaks increase. did. On the other hand, when the turning angle of the separator roll is 15 degrees (Comparative Example 1-2), the yarn width on the drawing roll is widened, the single yarns are scattered, and contact between the single yarns occurs or contact between the yarns occurs. As a result, the number of fluff and thread breakage increased. On the other hand, when the turning angle of the separator roll is 1.5 degrees, 5 degrees, and 8 degrees (Examples 1-1, 1-2, and 1-3), the dirt accumulated on the stretching roll is effectively removed. In addition, since there was no single yarn scattering phenomenon on the drawing roll, the number of fluffs was small and it was possible to stably and directly draw the yarn without breaking the yarn.

[Example 2]
The embodiment of direct spinning was the same as in Example 1, and the turning angle of the separator roll was changed to 5 degrees, and the turning speed of the separator roll was changed to 0 rpm, 0.5 rpm, 15 rpm, and 25 rpm.
Table 2 also shows the evaluation results of these conditions and roller dirt, single yarn breakage, yarn breakage, and yarn width on the second drawing roll.

  As is clear from Table 2, when the turning speed of the separator roll was 0 rpm (Comparative Example 2-1), the dirt accumulated on the drawing roll was not removed, and the number of fluffs and the number of yarn breaks increased. On the other hand, when the turning speed of the separator roll is 25 rpm (Comparative Example 2-2), the yarn width on the drawing roll is widened and the single yarns are scattered to cause contact between the single yarns and contact between the yarns. The number and thread breakage increased. On the other hand, if the turning speed of the separator roll is in the range of 0.5 rpm to 20 rpm (Examples 2-1 and 2-2), it is possible to effectively remove dirt accumulated in the drawing roll, In addition, since there was no single yarn breakage phenomenon on the drawing roll, it was possible to stably draw the yarn directly with a small number of fluff and without yarn breakage.

[Example 3]
The embodiment of the direct spinning method is the same as in Example 1. The separator roll swivel angle is 5 degrees, the separator roll swirl speed is 1 rpm, and the surface roughness of the separator roll is 0.5 microns, 5 microns, Ra. It was changed to 7 microns.
Table 3 also shows the evaluation results of these conditions and roller dirt, single yarn breakage, yarn breakage, yarn width on the second drawing roll, and yarn swaying state on the second drawing roll.

  As is apparent from Table 3, when the surface roughness of the separator roll is 7 microns (Comparative Example 3-2), the yarn width on the drawing roll is widened, and the single yarn is scattered and the yarn sway is increased. Since contact between single yarns and contact between yarns occurred, the number of fluff and the number of yarn breaks increased. On the other hand, when the surface roughness of the separator roll is in the range of 0.4 to 6 microns (Examples 3-1 and 3-2), the yarn movement on the separator roll is smooth and excessive. Since there is no overlap of single yarns on the drawing roll, and there is no flaking of single yarns on the drawing roll and no wobbling, the number of fluffs is small and stable spinning is possible. It was possible to stretch directly.

[Example 4]
The embodiment of direct spinning is the same as in Example 1. The separator roll swivel angle is 5 degrees, the separator roll swirl speed is 1 rpm, the surface roughness of the separator roll is 1.5 microns, and the separator roll 1 And undrawn yarn take-up roll 2 in FIG. In the case of shouldering like C, the separator roll 1 and the undrawn yarn take-up roll 2 are shown in FIG. As in A, direct spinning was performed in the case of 2 wraps and 4 wraps (Examples 4-1 and 4-2, Comparative Example 4-1). Further, instead of the separator roll that swirls in a conical shape, a yarn path guide that reciprocates in the direction of the rotation axis of the first drawing roll was provided, and spinning was directly drawn in the same manner (Comparative Example 4-2).
These conditions and roller dirt, single yarn breakage, yarn breakage, and the evaluation results of the yarn width on the second drawing roll are also shown in Table 4.

  As is apparent from Table 4, the yarn path guide (Comparative Example 4-2) reciprocatingly moved in the direction of the rotation axis of the first drawing roll (Comparative Example 4-1) when wrapped on the separator roll and the undrawn yarn take-up roll (Comparative Example 4-1). ), The yarn width on the drawing roll became extremely small, and heat was not transmitted uniformly on the drawing roll, leading to an increase in the number of fluffs and the number of yarn breaks. On the other hand, about what was wrapped on the separator roll and the undrawn yarn take-up roll (Example 4-1), and what was wrapped on the separator roll and the undrawn yarn take-up roll at 3 laps or less (Example 4-2), It was possible to stably spin and directly stretch the yarn without reducing the yarn width on the drawing roll.

  The direct spinning method of the present invention can be suitably used in the production of fibers for industrial materials having high strength and high fineness made of nylon 6, nylon 66, polyester or the like.

The schematic diagram which shows arrangement | positioning and the threading method of the separator roll of this invention. Explanatory drawing which shows the means to rotate the separator roll of this invention periodically to conical form. Explanatory drawing showing the outline of the spinning direct drawing method of this invention.

Explanation of symbols

  1. Separator roll, 2. Undrawn yarn take-up roll, 3 (a). A first drawing roll on the side of taking up the yarn, 3 (b). 3. first drawing roll on the side for sending out the yarn; 4. separator roll shaft, 5. Separator roll turning drive motor, 6. Separator roll swivel disk, 7. Separator roll rotation drive motor, Oiling roll, 9. Second stretching roll, 10. Third stretching roll, 11. Fourth stretching roll, 12. Running yarn.

Claims (2)

  In the synthetic fiber spinning direct drawing apparatus, the synthetic fiber yarn that has been melt-spun is led to a plurality of drawing rolls through an undrawn yarn take-up roll, drawn in multiple stages with the drawing roll, heat-treated, and continuously wound. A synthetic fiber spinning direct drawing apparatus, wherein an undrawn yarn take-up roll is provided with a rotatable separator roll and means for rotating the separator roll in a conical shape.   2. The synthetic fiber according to claim 1, wherein the separator roll is swung in a conical shape, and the yarn on the drawing roll guided through the separator roll is traversed in the direction of the drawing roll rotation axis. Spinning direct drawing method.

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