JP5120589B2 - Polyurethane elastic bobbin, method for producing the same, and method for unwinding polyurethane elastic yarn - Google Patents

Description

  The present invention relates to a polyurethane elastic bobbin, a method for producing the same, and a method for unwinding polyurethane elastic fibers. More specifically, the present invention relates to an elastic bobbin having good unwinding property of polyurethane elastic yarn when used in a processing step.

  Products using polyurethane elastic yarns have been used in large quantities in many commodity fields that require stretchability, for example, clothing materials, industrial materials, and medical and sanitary materials. Many of the products are manufactured using elastic yarns in the form of fabrics such as woven fabrics or knitted fabrics, or in the form of yarns as they are. When manufacturing the product, prepare the required number of elastic yarn wound bodies in which elastic yarn is wound around a tube, and sequentially or in parallel, elastic yarn from the wound yarn body, a negative feeding device (vertical device) or active Unwinding using a feeding device (rolling device), pulling out the elastic yarn, and supplying it to the fabric forming region or the yarn forming region.

  Here, the polyurethane elastic yarn has high inherent adhesiveness due to its chemical structure, and because of this high adhesiveness, the resistance when pulling the elastic yarn from the wound body sequentially or in parallel is reduced or constant. In order to stably unwind the necessary yarn length and supply it to the fabric forming area or the yarn forming area, a treatment agent such as an oil agent is attached to the surface of the yarn before winding. It is done.

  However, when the elastic yarn is drawn from the elastic bobbin produced by the conventional technique using a depolarized feeding device (vertical removing device) or a positive feeding device (rolling-off device) to form a fabric or yarn, Defects in the quality of the fabric due to the difference in density of stitches or weaves on the fabric, for example, cracks in warp knitted fabric, warps called white streaks, or forms due to local sagging of yarns aligned on the yarn The above disadvantages occur. Further, due to the difference in unwinding property between the outermost layer and the innermost layer, the amount of elastic yarn fed out varies, and the dimensions of the final product vary.

  In order to solve these problems, a method has been proposed in which the amount of oil applied is adjusted so that the amount of treatment agent such as the oil applied becomes uniform from the outermost layer to the innermost layer (Patent Document 1). In other words, even if a constant amount of spinning oil is always applied from the beginning of winding to the end of winding, the low-viscosity oil that has been deposited moves within the winding thread within a few days after spinning, causing variations in the amount of adhered oil. In order to avoid this problem, the adhesion amount of the oil agent is homogenized between the layers after the adhered oil agent moves in the wound body after spinning in order to avoid this problem. There has been proposed a method of changing the oil agent adhesion amount with a substantially U-shaped curve distribution.

However, if the amount of the treatment agent is only uniform from the outermost layer to the innermost layer, the unraveling due to the difference in winding tightening caused by the difference in winding diameter between the respective layers and the deformation of the yarn surface of the inner layer portion resulting from the winding tightening. It is difficult to sufficiently eliminate the variation in the properties, and as a result, it is difficult to sufficiently eliminate the above-mentioned defects.
JP 2001-63920 A

  The object of the present invention is to sufficiently solve the above-mentioned problems of the prior art, sufficiently improve the unwinding variation such as unwinding tension when unwinding the elastic yarn from the wound body, Another object of the present invention is to provide an elastic bobbin that can produce an elastic product of excellent quality without any defects in form and shape, and to provide a method for producing the elastic bobbin.

In order to achieve the above object, the polyurethane elastic bobbin of the present invention is an elastic bobbin formed by winding a polyurethane urea elastic yarn having a yarn fineness of 15 to 200 denier applied with an oil in a spinning process on a winding core. The amount of oil agent attached to the innermost layer portion and / or the outer layer portion of the wound body is larger than the amount of oil agent attached to the middle layer portion, and the amount of oil agent attached to the innermost layer portion and / or outer layer portion where the amount of oil agent attached is large ( The ratio (a / b) between a) and the amount of oil agent adhering to the middle layer part (b) is 1.05 to 5.0, and the viscosity of the oil agent adhering to the polyurethane elastic yarn is 15 to 40 mm ² / s. It is characterized by being.

One of the methods for producing the polyurethane elastic bobbin of the present invention is a polyurethane elastic bobbin that is wound after an oil agent is applied to the spun polyurethane urea elastic yarn having a fiber fineness of 15 to 200 denier by an oiling roll. In the production method of the above, an oil agent having a viscosity of 15 to 40 mm ² / s is used, and the rotation speed of the oil supply roll is changed stepwise, so that the rotation speed of the oil supply roll when winding the innermost layer and / or winding the outer layer The ratio of the oil supply roll rotation speed (c) at the time of winding the innermost layer and / or the outer layer winding with a high oil supply roll rotation speed to the oil supply roll rotation speed (d) at the time of intermediate layer winding ( c / d) is 1.1 to 5.0.

Another method for producing a polyurethane elastic bobbin of the present invention is a polyurethane elastic bobbin that is wound after an oil agent is applied to a spun polyurethane urea elastic yarn having a fiber fineness of 15 to 200 denier by an oiling guide. In the production method of the above, an oil agent having a viscosity of 15 to 40 mm ² / s is used, and an oil agent supply amount to the oil supply guide is changed stepwise to supply the oil agent at the time of winding the innermost layer and / or winding the outer layer. Between the oil supply amount (e) at the time of winding the innermost layer and / or the outer layer and the oil agent supply amount (f) at the time of winding the middle layer with a high oil supply amount to the oil supply guide (E / f) is set to 1.1 to 5.0.

  The polyurethane elastic bobbin of the present invention has a ratio (a1 / b) of the innermost layer oil agent adhesion amount (a1) to the middle layer oil agent adhesion amount (b) of 1.05 to 5.0. Is preferably unraveled by a positive delivery device, and the ratio (a2 / b) of the outer layer oil agent adhesion amount (a2) to the middle layer oil agent adhesion amount (b) is 1.05 to 5.0. In some cases, it is preferable to unwind with a negative feed device.

Unraveling variation such as unwinding tension when unwinding elastic yarn from polyurethane elastic bobbin can be sufficiently eliminated, and excellent quality stretchability without defects in quality or form Ru can be used to manufacture the product.

Hereinafter, the elastic bobbin of the present invention and the manufacturing method thereof will be described in detail.
The polyurethane elastic yarn wound body of the present invention is obtained by winding a polyurethane elastic yarn to which a treatment agent is applied in a spinning process on a winding core.

Polyurethane elastic yarn in the present invention is an elastic yarn composed of Po Li urethane urea Po Li urethane urea or polyether polyester, complexed or mixed with other organic synthetic resin body to Lapo Li urethane urea elastic A thread or the like may be used.

The polyurethane elastic yarn may be either a monofilament yarn or a multifilament yarn, and in the present invention, a multifilament yarn, particularly a multifilament yarn in which a plurality of single yarns are bonded together is preferable.
Also, yarn fineness of the elastic yarn, Ru following ranges der 200 denier 1 5 denier.

The treatment agent applied to the elastic yarn in the present invention is not particularly limited as long as it is an object attached for the purpose of reducing the tackiness of polyurethane elastic yarn, improving higher-order processability, and the like. For example, dimethylpolysiloxane it can be used a part of the other alkyl groups such as methyl group, phenyl group, modified polysiloxane substituted with an amino group or the like, a mineral oil, an oil as a main component such as silicon cone like.

Since the elastic thread wound body of the present invention attaches more oil agent to the innermost layer portion and / or outer layer than the middle layer to increase the amount of oil agent adhered, the oil agent adhered to the elastic thread is contained in the wound thread body. It is preferable that it is difficult to transfer to other winding layers. From this point of view, in the present invention, the viscosity of the oil agent attached to the elastic yarn is preferably as high as 15 mm ² / s or more, more preferably in the range of 15 to 40 mm ² / s, more preferably It is the range of 20-25 mm < ² > / s.

  Moreover, the oil agent adhesion amount to the elastic yarn is the oil agent adhesion amount in the middle layer, preferably in the range of 1 to 20% by weight, and more preferably in the range of 3 to 15% by weight.

  The elastic bobbin of the present invention has an oil agent adhesion amount in the innermost layer portion and / or outer layer portion larger than the oil agent adhesion amount in the middle layer portion, and moreover the oil agent in the innermost layer portion and / or outer layer portion where the oil agent adhesion amount is large. The ratio (a / b) between the adhesion amount (a) and the oil agent adhesion amount (b) in the middle layer is 1.05 to 5.0.

  The specific aspect is that the oil agent adhesion amount of the innermost layer portion is made higher than that of other layers, the oil agent adhesion amount of the outer layer portion is made higher than that of other layers, or the oil agent adhesion amount of the innermost layer portion and The amount of the oil agent attached to the outer layer is set to a predetermined level higher than that of the other layers. Here, the innermost layer portion and / or the outer layer portion having a higher oil agent adhesion amount has an oil agent adhesion amount (a) of 1.05 to 5.0 times the oil agent adhesion amount (b) of the middle layer portion, preferably 1.2 to 3.0 times.

  Here, the amount of oil agent attached to the outer layer portion, the amount of oil agent attached to the innermost layer portion, and the amount of oil agent attached to the middle layer portion may be measured by the method described later. That is, the elastic yarn of the outer layer portion is sampled from the layer where the elastic yarn having a weight of about 0.5% of the total winding amount of the wound yarn body is peeled and removed from the surface of the wound yarn body, and the elasticity of the innermost layer portion is sampled. The yarn is sampled from the layer where the weight of the wound yarn is about 0.5% of the total winding amount of the wound yarn, and the elastic yarn in the middle layer is the length of the wound yarn in the wound yarn. It is obtained by sampling from the layer at the center in the vertical direction and measuring the oil component adhering to these elastic yarns.

  In the elastic thread wound body of the present invention, a tubular body made of paper, synthetic resin, or the like is used as the winding core, for example, a paper tube, and the form of the wound body is cheese, drum, or bobbin. What is called a shape is included.

The length of the winding core used in the present invention is preferably in the range of 50 mm to 200 mm, more preferably in the range of 50 mm to 120 mm.
The amount of elastic yarn wound in the wound body is preferably in the range of 200 g to 4.5 kg, and more preferably in the range of 200 g to 1.5 kg.

Next, the manufacturing method of the elastic bobbin body of this invention is demonstrated.
FIG. 1 is an apparatus schematic diagram showing an example of a spinning equipment used in the process of spinning polyurethane elastic yarn, applying an oil agent and winding it in the method of the present invention.

  In FIG. 1, a polyurethane spinning stock solution is discharged from a spinneret 20 to become a spun yarn 21, and after passing through a heating area 22, is given a false twist by an entanglement means 23 such as a nozzle from a temporary air, or simply A multifilament yarn Y is gripped by gripping means 23 ′ such as a yarn gripping guide. Thereafter, the multifilament yarn Y is given an elongation rate corresponding to a rotation speed ratio set in advance by the first feed roll 24 and the second feed roll 25. Further, an oil agent is applied to the multifilament yarn Y by the oil agent applying device 26.

  As the oil agent applying device 26, the multifilament yarn Y is directly or indirectly brought into contact with the surface of the oil supply roll 27 in a state in which an oil agent film is formed on the surface of the oil supply roller 27, and the oil agent is supplied from the surface of the oil supply roller 27 to the multifilament yarn. An oil supply roll system for transferring oil onto the surface of the strip Y and applying a predetermined amount of oil supplied in a metered manner to the surface of the multifilament yarn during guide travel is applied. Examples thereof include an oil supply guide method (not shown) and a method (not shown) in which an oil agent is sprayed toward the multifilament yarn oil agent and directly applied to the elastic yarn surface.

  The oil agent application device 26 is preferably provided between the first feed roll 24 and the second feed roll 25, but is arranged upstream of the first feed roll 24 or downstream of the second feed roll 25. May be. The multifilament yarn Y is then wound up by a winder (also referred to as a winder) 41 to form the elastic yarn wound body 1.

  In the present invention, when the elastic yarn is wound around the tube, the level of the amount of the oil agent applied to the elastic yarn is changed from the start of winding to the end of winding so as to satisfy a predetermined condition.

  FIG. 2 shows an example of control equipment for setting the oil application amount to a predetermined level and changing the oil supply level in the middle of winding in the oil supply roll type oil application device of the spinning equipment shown in FIG.

  In FIG. 2, the oil supply roll 27 is rotated at a predetermined rotational speed by a drive motor 28 whose rotational speed is adjusted to a predetermined level by a drive frequency changing means 29 such as an inverter. If the rotational speed of the oil application roll is increased by increasing the rotational speed of the drive motor 28 while maintaining the yarn speed traveling in contact with the oil supply roll 27, the amount of oil that contacts the thread increases within a unit time. The oil agent adhesion amount transferred and adhered from the oil supply roll 27 to the yarn surface increases. On the contrary, when the rotation speed of the oil supply roll is lowered, the amount of the processing agent that comes into contact with the yarn within a unit time decreases, and the amount of oil agent adhesion decreases.

  In the case of the present invention, the amount of oil agent attached to the innermost layer portion and / or the amount of oil agent attached to the outer layer portion is increased. Therefore, at the time of winding to form those layers, the number of oil supply rolls is increased and the amount of oil agent attached is increased. To do. The rotation speed of the oil supply roll when increasing the oil adhesion amount is set to a level higher than the rotation speed of the oil supply roll when winding the middle layer, that is, a level 1.1 to 5.0 times, preferably 1.25 to The level is 3.0 times. Thereby, even if the oil agent adhesion amount is slightly reduced in the innermost layer portion and the outer layer portion, the oil agent adhesion amount in the innermost layer portion and / or the outer layer portion can be increased to a predetermined level.

  In addition, when applying an oil agent with an oil supply guide, the amount of the oil agent supplied to the oil supply guide is measured by an oil agent measuring device arranged in the middle of the oil agent pipe to the oil supply guide. By changing the level according to the winding layer on the winding core, the amount of oil agent attached to the innermost layer portion and / or the outer layer portion can be increased. In this case, the amount of the oil agent supplied to the oil supply guide at the time of winding the innermost layer portion and / or the outer layer portion is higher than the amount of oil agent supplied at the time of winding the middle layer portion, that is, 1.1 to 5.0. By setting the level to double, and preferably to the level of 1.25 to 3.0, the oil agent adhesion amount of these layers can be increased to a predetermined level.

  In a winding machine 41 that winds an elastic yarn around a winding core to form an elastic yarn wound body, the drive motor 43 for the surface drive roll 42 that rotates the wound body is also used in the same drive frequency changing means 44. Are connected and winding at a predetermined speed is performed.

  The drive frequency changing means 29 for setting the rotation level of the oil supply roll 27 and the drive frequency changing means 44 for setting the winding speed in the winder are both connected to the winding time management device 45 and controlled over time. Therefore, the layer wound on the winding core and the rotation speed of the fueling roll can be linked and controlled to a predetermined set value.

  In this case, in order to control the winding condition in the winder 41, a winding time management device 45 is also connected to the driving motor 43 of the driving roll 42 via the driving frequency changing means 44. A drive motor 56 for driving the cam roll 55 for traversing the elastic yarn winder is also connected to the winding time management device 45 via the drive frequency changing means 44. When a preset winding time elapses, the elastic thread winding body 1 is automatically switched to the spindle 47 with the empty tube mounted on standby, and the elastic yarn is continuously wound on the next empty tube. To go. In place of automatic winding switching, an elastic bobbin is manually wound when the operator is informed that the winding is complete by means 48 such as voice or lamp lighting by a signal from the winding time management device 45. It is also possible to perform a winding switching operation from the thread body 1 to the spindle 47 fitted with an empty tube.

  The polyurethane elastic bobbin obtained by the present invention has good unwinding properties when unwinding from the innermost layer and unwinding from the outer layer. In the case of (vertical removal device), it is preferable to increase the amount of oil agent attached to the outer layer of the elastic bobbin. In addition, when the unwinding from the wound body is actively sent out (rolling-off device), especially when the fine-fine elastic yarn is unwound with the active feeding device, the amount of oil agent attached to the innermost layer of the elastic wound body is reduced. Higher is preferred. In addition, when the adhesion amount of the outer layer and the innermost layer is higher than that of the middle layer, both the unwinding by the negative feeding device (vertical removal device) and the unraveling by the positive feeding device (rolling device) Can also be suitably handled.

  The invention is explained in more detail by means of examples. The present invention is not limited to these examples. The evaluation method in the present invention will be described first.

[Measurement of oil adhesion amount]
The elastic yarn is peeled off from a predetermined layer portion in the elastic bobbin to prepare a sample, which is immersed in tetrachloroethylene to extract the adhered oil agent. This extract is measured with an infrared absorptiometer manufactured by JASCO Corporation and assigned to a calibration curve measured in advance to measure the amount of oil attached. The amount of the oil agent attached represents the ratio of the oil agent weight to the fiber weight by percentage. In addition, the measurement of this oil agent adhesion amount was performed about the elastic bobbin immediately after spinning and winding (for example, within 24 hours).

[Measurement of pantyhose rubber knitted fabric dimensions]
The knitted pantyhose elastic band knitted fabric is allowed to stand on a board, and the lateral length of the knitted fabric is measured with a ruler.

[Measurement of unwinding tension]
The unwinding tension is measured by the apparatus shown in FIG. The polyurethane elastic fiber wound body 1 wound around the tube 2 is fixed as shown in FIG. 3, and the polyurethane elastic thread Y is unwound from the side surface of the wound body 1 at a constant speed of 45.7 m / min. The unraveled running yarn 3 is passed through the guide 4 and the slit guide 5 made of ceramic, and a trajectory bent at 90 degrees is drawn by the tensiometer roll 6 and is sent by the drive roll 12 at 45.7 m / min. At the same time, a trajectory bent at 90 degrees is drawn and sucked by the soccer gun 13. The free tensiometer roll 6 is connected to an electric strain gauge 7, and the electric signal is averaged by an integrator 9 through a conductive wire 8 and the data is stored in a recorder 11. This test is performed for 4 minutes and the average tension of the 183 m yarn path is measured. The measurement temperature is 25 ° C. and 60% RH.

  The position of the wound yarn body to be measured is the outer layer, the central layer, and the innermost layer of the wound yarn body. Here, when the total winding amount of the wound body is 1100 g, the outer layer of the wound body is a layer where 5 g of yarn has been removed from the surface of the wound body. This is because the winding pattern on the surface of the wound body may be intentionally changed. The innermost layer is a layer where 5 g of the wound yarn is left in the wound body. The center layer is a layer in the middle of the wound body outer layer and the innermost layer. As the wound body for measuring the unwinding tension, one stored at about 20 ° C. for 3 months or more after spinning was used.

[Example 1]
Using the spinning equipment shown in FIG. 1, a polyurethane-based elastic yarn having a filament fineness of 156 dtex and a filament number of 12 is produced from a polyurethane urea spinning dope, wound on a tube having a width of 115.5 mm, and a full winding time of 120 minutes. An elastic bobbin with a winding amount of 1100 g was produced.

The oil applied in the spinning process is a silicone-based oil having a viscosity of 25 mm ² / s, and the rotation speed of the oil supply roll is adjusted by adjusting the output frequency of the inverter so that the amount of oil attached to the elastic yarn is high in the outer layer. Control was performed as shown in FIG. The amount of oil agent attached to the outer layer, middle layer, and innermost layer of the obtained elastic wound body was measured immediately after being wound (within 24 hours), and as shown in Table 1, the amount of oil agent attached to the outer layer was the middle layer. It was 1.54 times. The elastic yarn of this wound body was provided with a high-viscosity spinning oil agent, so the amount of oil agent adhesion was not homogenized even after 2 to 5 weeks after winding of the spinning, and the oil agent adhesion amount in the outer layer was It was almost as high as that immediately after winding. Furthermore, after 3 months from the winding of the spinning, the amount of oil was slightly homogenized, but the amount of oil in the outer layer was still higher than that in the middle layer, and the amount of oil in the outer layer was 1.3 times that in the middle layer. there were.

  Elastic yarn is released from the outer layer, middle layer, and innermost layer of the elastic thread wound body after about 30 days from spinning by supplying warp and unwinding, and a pantyhose mouth rubber part knitted fabric (flat knitting) is applied to each layer 15 by a normal method. This was organized. The width dimension was measured, and the average value and variation of the dimension were calculated for each layer and compared.

  As shown in Table 2, the obtained knitted fabric dimensions are uniform with little variation in the average value of each outer layer, middle layer, and innermost layer of 0.3 cm, and small variation of all measured values of 0.5 cm. It was a knitted fabric.

[Comparative Example 1]
A polyurethane-based elastic yarn having a filament fineness of 156 dtex and a filament number of 12 was produced in the same manner as in Example 1 except that the oil agent application conditions were changed, wound on a tube having a width of 115.5 mm, and a full winding time of 120 minutes. To produce an elastic bobbin with a winding amount of 1100 g.

The oil agent applied in the spinning process is a silicone-based oil agent having a viscosity of 12 mm ² / s, and the rotation speed of the oil supply roll was set to a constant level of 20 rpm from the start of winding to the end of winding (as shown in FIG. 5). As shown in Table 1, when the outer layer, the inner layer, and the innermost layer were measured for the amount of oil attached to the outer layer, the middle layer, and the innermost layer (within 24 hours), the amount of oil applied to the outer layer and the innermost layer was It was almost the same level as the middle class.

Using the elastic yarn unwound from the outer layer, the middle layer, and the innermost layer of the elastic bobbin thread after about 30 days from spinning, 15 layers of pantyhose mouth rubber part knitted fabric were knitted in the same manner as in Example 1, evaluated.
As shown in Table 2, the obtained knitted fabric had a large variation of 0.9 cm in the average value of each layer of the outer layer, the middle layer, and the innermost layer, and a variation of 1.2 cm in all measured values. This indicates that the variation in the amount of elastic yarn delivered during unwinding was large, and the unwinding property was inferior to that of Example 1.

[Example 2]
Using the spinning equipment shown in FIG. 1, a polyurethane-based elastic yarn having a filament fineness of 22 dtex and a filament number of 3 is manufactured from a polyurethane urea spinning stock solution, wound on a tube having a width of 57.6 mm, and a full winding time of 120 minutes. An elastic bobbin with a winding amount of 500 g was produced.

The oil agent applied in the spinning process is a silicone-based oil agent having a viscosity of 25 mm ² / s. By adjusting the output frequency of the inverter, the rotation speed of the oil supply roll is adjusted so that the amount of oil agent attached to the elastic yarn is high in the innermost layer. Control was performed as shown in FIG. The amount of oil agent attached to the outer layer, middle layer, and innermost layer of the obtained elastic thread wound body was measured immediately after being wound (within 24 hours), and as shown in Table 1, the amount of oil agent attached to the innermost layer was It was 1.45 times that of the middle layer. Since the elastic yarn of this wound body was provided with a high-viscosity spinning oil agent, the oil agent adhesion amount was not homogenized even after 2 to 5 weeks after winding of the spinning, and the oil agent adhesion amount in the innermost layer Was almost as high as immediately after winding. Further, after 3 months or more after winding of the spinning, the amount of the oil agent adhered was slightly homogenized, but the oil agent adhesion amount in the innermost layer was still higher than that in the middle layer.

  The elastic yarn was released from the outer layer, the middle layer, and the innermost layer of the elastic wound body after about 30 days from spinning with the rolling and unwinding device shown in FIG. 3, and the unwinding tension was measured. The unraveling tension in each layer is as shown in Table 3. The unraveling tension from the innermost layer was not excessively high, and the unraveling tension was lower than that of Comparative Example 2 below, indicating good unraveling properties.

[Comparative Example 2]
In the same manner as in Example 2, a polyurethane elastic yarn having a yarn fineness of 22 dtex and a filament number of 3 was produced, wound on a tube having a width of 57.6 mm, and an elastic yarn wound having a winding amount of 500 g in a full winding time of 120 minutes. The body was manufactured.

The oil applied in the spinning process is a silicone-based oil having a viscosity of 12 mm ² / s, and the number of rotations of the oil supply roll was set at a constant level of 8 rpm from the start of winding to the end of winding (as shown in FIG. 7). As shown in Table 1, when the outer layer, the inner layer, and the innermost layer were measured for the amount of oil attached to the outer layer, the middle layer, and the innermost layer (within 24 hours), the amount of oil applied to the outer layer and the innermost layer was It was almost the same level as the middle class.

  The unwinding tension from the outer layer, the middle layer, and the innermost layer of the elastic wound body after about 30 days from spinning was measured in the same manner as in Example 2. The unraveling tension in each layer is as shown in Table 3. The unraveling tension from the innermost layer was extremely high, the variation in unraveling tension was large, and the results were inferior to those in Example 2.

  The polyurethane elastic bobbin of the present invention is used as an elastic bobbin for supplying polyurethane elastic yarn in a process for producing a product that requires stretchability.

It is the apparatus schematic of the spinning equipment which shows an example of the spinning of the polyurethane elastic yarn to which this invention method is applied, and a winding process. FIG. 2 is a process perspective view showing equipment related to control of roll rotation in the spinning equipment shown in FIG. It is a device schematic diagram showing an unwinding tension measuring device in rolling and unwinding from an elastic bobbin. It is a graph which shows the control value of the rotation speed of the oil supply roll in Example 1 corresponding to winding-up time. It is a graph which shows the control value of the rotation speed of the oil supply roll in the comparative example 1 corresponding to winding-up time. It is a graph which shows the control value of the rotation speed of the oiling roll in Example 2 corresponding to winding-up time. It is a graph which shows the control value of the rotation speed of the oil supply roll in the comparative example 2 corresponding to winding-up time.

Explanation of symbols

20: Spinneret 21: Spinning yarn 22: Heating zone 24: First feed roll 25: Second feed roll 26: Oil supply device 27: Oil supply roll 28: Oil supply roll drive motor 29: Drive frequency changing means Y: Multifilament yarn 41: Winding machine 1: Elastic yarn wound body 45: Winding time management device

Claims (5)

An elastic thread wound body in which a polyurethane urea elastic thread having a yarn fineness of 15 to 200 denier applied with an oil agent in a spinning process is wound on a winding core, in an innermost layer portion and / or an outer layer portion of the wound body Ratio of oil agent adhesion amount (a) in the innermost layer portion and / or outer layer portion where the oil agent adhesion amount is larger than the oil agent adhesion amount in the middle layer portion and the oil agent adhesion amount is large, and the oil agent adhesion amount (b) in the middle layer portion ( A polyurethane elastic bobbin, wherein a / b) is 1.05 to 5.0, and the viscosity of the oil agent adhering to the polyurethane elastic yarn is 15 to 40 mm ² / s. In a method for producing a polyurethane elastic bobbin that is wound on a spun polyurethane urea elastic yarn having a fiber fineness of 15 to 200 denier and then wound with an oil agent using an oil supply roll, an oil agent having a viscosity of 15 to 40 mm ² / s is used. , By changing the rotational speed of the oil supply roll stepwise, increasing the rotational speed of the oil supply roll at the time of winding up the innermost layer and / or winding up the outer layer, and at the time of winding up the innermost layer at a high speed of the oil supply roll, and The ratio (c / d) of the oil supply roll rotation speed (c) at the time of outer layer winding and the oil supply roll rotation speed (d) at the time of intermediate layer winding is set to 1.1 to 5.0. A method for producing a polyurethane elastic bobbin. In a method for producing a polyurethane elastic bobbin wound by applying an oil agent to a spun polyurethane urea elastic yarn having a fiber fineness of 15 to 200 denier by an oil supply guide, an oil agent having a viscosity of 15 to 40 mm ² / s is used. The oil supply amount to the oil supply guide is changed stepwise, the oil agent supply amount is increased at the time of winding the innermost layer and / or the outer layer is wound, and the oil supply amount to the oil supply guide is increased. The ratio (e / f) of the oil supply amount (e) during winding and / or outer layer winding to the oil supply amount (f) during middle layer winding is 1.1 to 5.0. A method for producing a polyurethane elastic bobbin. The polyurethane elastic bobbin according to claim 1, wherein the ratio (a1 / b) of the innermost layer oil agent adhesion amount (a1) to the middle layer oil agent adhesion amount (b) is 1.05 to 5.0. A method for unwinding a polyurethane elastic yarn, comprising unwinding a certain object using a positive delivery device. 2. The polyurethane elastic bobbin according to claim 1, wherein the ratio (a2 / b) of the outer layer oil agent adhesion amount (a2) and the middle layer oil agent adhesion amount (b) is 1.05 to 5.0. A method for unwinding a polyurethane elastic yarn, comprising unwinding an object with a negative feed device.

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