JP7192210B2 - Synthetic fiber manufacturing equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a synthetic fiber production apparatus, and more particularly, when producing a wide variety of synthetic fibers with the same melt spinning apparatus, it is possible to obtain good quality and spinnability in various varieties and to facilitate variety switching work. It is possible to reduce production loss by reducing labor and shortening time.

In the production of synthetic fibers represented by polyamides, polyesters, etc., especially synthetic fibers for clothing, the spun yarn is generally taken and drawn using a plurality of rolls, and some of these rolls are heated. Therefore, the yarn is heat-treated on a roll, and the drawn and heat-treated yarn is wound by a winder.

In particular, among these manufacturing processes, the heat treatment process heats the yarn and controls the crystal structure inside the yarn, which greatly affects the physical properties of the resulting synthetic fiber, such as the strength and thermal shrinkage of the raw yarn. From the point of view of spinning properties, excessive heating causes thermal deterioration of the polymer and evaporation of the oil component adhering to the yarn for the purpose of imparting smoothness and antistatic properties, resulting in yarn breakage. It is important to carry out an appropriate heat treatment according to each type because it causes deterioration of reeling properties.

Next, the heat treatment of the yarn by the roll will be described. When the yarn is heated on the roll for heat treatment, there are two factors that affect the heat treatment: the heating temperature of the roll and the heat treatment time of the yarn on the roll based on the contact length between the roll and the yarn. There are two factors. For the former, if the heating temperature of the roll exceeds the melting point of the polymer used, the yarn is fused to the roll and broken. The upper limit of the heating temperature is limited by the type of polymer and the adhered oil, since it causes evaporation of the adhering oil. In addition, since polyamide fibers have a higher specific heat than polyester fibers and the yarn temperature does not rise easily, the amount of heat required for heat treatment increases even more. Therefore, in the heat treatment, it is more effective to optimize the heat treatment time, ie, the contact length, rather than the heating temperature, in terms of physical properties and reeling properties.

Next, the configuration of the rolls for heat treatment will be described. As for the rolls used for take-up, drawing and heat treatment, two rolls are paired and the rotation axes of the two rolls are shifted from being perfectly parallel by a small angle so that the yarn is wound multiple times on different positions of the two rolls. The Nelson method, which makes it possible, is often adopted. In this Nelson method, since the yarn is wound on the roll multiple times, the length of contact between the roll and the yarn can be increased, and the heat treatment time of the yarn on the roll can be relatively long. .

When constructing the yarn path by the Nelson method, a certain number of times of winding can be constructed depending on the arrangement of the two rolls and the angle of the rotation axis. However, when changing the number of windings once configured, by changing the rotation axis angle of the roll, the number of windings can be changed, albeit slightly, but in order to make a large change, it is necessary to change the roll arrangement and the rotation axis angle. In other words, it was necessary to modify the equipment. In addition, even if the number of windings is changed to some extent by changing the rotation axis angle, the width of the yarn entering and exiting on the rolls will change, so the yarn guide between the rolls will cause bending of the yarn path, resulting in unstable yarn running. For example, contact damage to the yarn due to bending at yarn guides installed between rolls is caused, causing fluff generation, strength reduction, and the like. Furthermore, in some cases, the yarn path itself cannot be constructed because the yarn path comes into contact with other devices installed between the rolls.

As a prior art related to changing the number of windings and changing the yarn path by a yarn path guide in such a Nelson method, for example, Patent Document 1 discloses a separator roll that rotates in a conical shape to draw the yarn on the drawing roll. A method for spinning and direct drawing of synthetic fibers is disclosed, which is characterized by traversing in the direction of the rotation axis of the rolls. It is said that the effect of this is that by traversing the yarn on the roll in the direction of the rotation axis of the roll, it is possible to suppress deterioration in quality and productivity caused by dirt accumulated on the roll and abrasion of the roll during long-term operation.

Further, in Patent Document 2, a yarn path guide is arranged between rolls to regulate the running position of the yarn, and means is provided for reciprocating the yarn path guide in the rotation axis direction of the rolls. A spin winding method is disclosed. It is said that the effect of this is to suppress deterioration in quality and productivity due to prevention of contamination and wear of the roll, as in Patent Document 1.

JP 2006-274475 A JP-A-8-170215

However, in the proposal of Patent Document 1, although it is possible to change the yarn path, it is difficult to significantly change the number of windings for heat treatment suitability, and the yarn path is bent due to traverse caused by the rotation of the separator roll. No consideration or suggestion has been made regarding suppression.

In addition, as proposed in Patent Document 2 above, in order to change the number of windings by the yarn guide, it is necessary to move the yarn guide to a large extent, and the amount of movement of the yarn guide increases the degree of bending. However, it is difficult to make a drastic change in the number of windings to make the yarn suitable for heat treatment, and no study or suggestion has been made regarding the suppression of the bending of the yarn guide caused by the movement of the yarn guide. .

For these reasons, heat treatment suitability based on the contact length and suppression of yarn path bending have a large effect on reeling performance and quality among melt spinning, so each condition should be optimized according to each product type. has been demanded.

In addition, as the cultivars become more sophisticated, it becomes necessary to make subtle changes to the conditions that are optimal for each cultivar.

In addition, in the yarn path according to the Nelson system, since the rotation axes of the two rolls are angled, an inclination occurs on the roll surface. Due to the inclination, the yarn slips in the direction of the rotation axis of the roll, resulting in deviation from the yarn path theoretically calculated from the mutual roll positions and the rotation axis angle. However, when arranging these rolls, since each of the multiple rolls is arranged based on the theoretically calculated yarn path, a deviation occurs between the theoretical yarn path and the actual yarn path. bending occurs in the thread path of In addition, since the coefficient of friction differs depending on the fineness of the variety, the number of single yarns, and the surface morphology of the slippage, the slippage and bending always vary depending on the variety. Since bending of the yarn path causes damage to the yarn as described above, fine adjustment of the yarn path so as to eliminate bending according to each type has been important from the viewpoint of reeling property.

Therefore, in the conventional technology, when changing the product type, changing the number of windings for heat treatment aptitude and adjusting the yarn path for suppressing bending of the yarn path entails significant equipment remodeling. was difficult. In addition, even if the equipment were to be remodeled, the work would require a lot of time and labor, and production would not be possible while the work was being done, resulting in loss of production opportunities (loss due to loss of raw materials and reduced production opportunities). was forced to

The present invention solves the above-mentioned problems, and can easily change the positions of the take-up and stretching rolls and the winder according to each product type without complicated equipment modification, and finely adjust the changed positions. By making it possible, the number of times the yarn is wound on the roll can be greatly changed, and furthermore, by configuring a yarn path that does not bend according to the yarn path between rolls, contact damage to the yarn guide, etc. To provide a manufacturing device that can obtain good quality and reeling performance in various kinds of products by reducing be.

In more detail, the spinning conditions and basic properties of the polymer, such as the thickness of the single yarn, the number of single yarns, the level of the spinning temperature, the slowness of the take-up speed, the level of the polymer viscosity, the presence or absence of copolymerization, the amount of additives, etc. By having a variable mechanism that can easily and easily adjust the appropriate number of windings and yarn path configuration that are not affected by these factors even if the yarn is changed, not only good quality and reeling performance can be obtained, but also By automatically changing the position of the take-up and stretching rolls/winders based on preset conditions, the labor and time required for this work can be almost eliminated. The present invention relates to a manufacturing device for synthetic fibers.

The above-mentioned object of the present invention is to draw and heat-treat a melt-spun synthetic fiber yarn in multiple stages with a plurality of take-up and drawing rolls, and continuously wind the synthetic fiber yarn using a winding machine. In the manufacturing apparatus, in order to move the multiple stages of take-up and stretching rolls and the winding machine to arbitrary positions, each is moved based on the detected current position and the position preset in the storage unit. A control unit is provided for simultaneously instructing the respective drive units to hold the thread in the above-mentioned multiple stages of take-up and drawing rolls and the winder according to the position of the yarn drawn out from each roll. can be achieved by a synthetic fiber manufacturing apparatus provided with a control unit that simultaneously instructs the respective driving units to move and hold the respective.

According to the synthetic fiber manufacturing apparatus of the present invention, when manufacturing a wide variety of synthetic fibers with the same melt spinning apparatus, there is no bending in the thread path and by changing the number of windings of the thread on the roll, various It is possible to obtain good quality and reeling property in the variety, and to reduce the loss of production opportunities by reducing the labor and time required for the variety changeover work.

1 is a schematic perspective view showing one embodiment of the synthetic fiber manufacturing apparatus of the present invention. FIG. FIGS. 2(a) to 2(c) are schematic perspective views showing one embodiment of a method for changing the number of windings using the roll position variable device and winder position variable device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic process diagram showing one embodiment of a method for driving and controlling a variable roll position device and a variable winder position device of the present invention; 1 is a schematic perspective view showing one embodiment of a roll position varying device configuration of the present invention; FIG. 1 is a schematic perspective view showing one embodiment of a winding machine position varying device configuration of the present invention; FIG.

The details of the present invention will now be described.

FIG. 1 is a schematic perspective view showing one embodiment of the synthetic fiber manufacturing apparatus of the present invention.

In FIG. 1, the synthetic fiber manufacturing apparatus of the present invention comprises a first roll (upper) 1a, a first roll (lower) 1b, a first roll unit 2, a first roll unit position varying device 3, and a second roll (upper). 4a, second roll (lower) 4b, second roll unit 5, second roll unit position varying device 6, yarn position sensor 7, yarn guide 8, winder 9 and winder position varying device 10. ing. Y indicates a melt-spun yarn.

In the apparatus of the present invention, the melt-spun yarn Y is taken over by the first roll (upper) 1a and the first roll (lower) 1b while the yarn is wound multiple times in the Nelson method, and the heated second In a device for drawing and heat-treating a yarn while winding it multiple times by the roll (upper) 4a and the second roll (lower) 4b by the Nelson method, and continuously winding the drawn yarn with a winding machine 9, A first roll unit position varying device 3, a second roll unit position varying device 6 and a winder position varying device 10 for sliding the first roll unit 2, the second roll unit 5 and the winder 9 in the direction of the roll rotation axis are provided. It is possible to change the number of roll windings and adjust the yarn path perpendicular to the rotation axis of the roll shaft where the yarn Y contacts the yarn guide 8 the least, that is, the yarn path without bending.

Further, the synthetic fiber production apparatus of the present invention is provided with a yarn position sensor 7 capable of detecting the position of the yarn drawn out from each roll. The yarn position sensor 7 makes it possible to detect whether or not the yarn led out from each roll forms a straight yarn path perpendicular to the rotation axis of the roll.

FIGS. 2(a) to 2(c) are schematic perspective views showing one embodiment of a method for changing the number of windings and the yarn path using the variable roll position device and the variable winder position device of the present invention.

In FIG. 2, if the number of windings on the first and second rolls is temporarily changed from 4 (FIG. 2(a)) to 2 (FIG. 2(b)), the second roll as shown in FIG. 2(b) The unit position varying device 6 is used to retract the second roll unit 5 in the direction of the roll rotation axis. At this time, the retreating position is a winding position where the yarn led out from the second winding position of the first roll unit 2 can construct a yarn path without bending such that it is perpendicular to the roll rotation axis direction. . Similarly, the winder position varying device 10 is used to retract the winder 9 in the direction of the roll rotation axis. At this time, the retracted position is such that the yarn drawn out from the second winding position of the second roll unit 2 is perpendicular to the direction of the rotation axis of the roll, that is, the winding position where a non-bent yarn path can be formed. retreat to In this way, by varying the positions of the second roll unit 5 and the winder 9, it is possible to easily change the unbent yarn path while changing the number of times of winding. Also, if the number of times of winding is changed from 4 times (Fig. 2(a)) to 1 time (Fig. 2(c)), as shown in Fig. 2(c), the second roll unit 5 and the winder 9 is further retracted in the roll rotation axis direction, it is possible to similarly change the number of windings from four to one.

Thus, by using the roll position varying device 6 and the winder position varying device 10 of the present invention, it is possible to freely change the number of times of winding on each roll and configure a yarn path without bending. . The variable range of the number of windings can be varied, for example, in the range of 1 to 10 times, and even if the number of windings is changed to any number, the yarn drawn out from each roll will reach the winder 9 without being bent. can lead.
Next, a method of driving and controlling the variable roll position device and the variable winder position device, which are features of the present invention, will be described.

FIG. 3 is a schematic process diagram showing one embodiment of a drive and control method for the variable roll position device and the variable winder position device.

In FIG. 3, the synthetic fiber manufacturing apparatus of the present invention includes a storage unit (variable roll position device) 11, a control unit (variable roll position device) 12, a driving unit (variable roll position device) 13, a detection unit (variable roll position device) 14, a common control unit 15, a storage unit (winder position variable device) 16, a control unit (winder position variable device) 17, a drive unit (winder position variable device) 18, and a detection unit (winder machine position variable device) 19 is provided.

The roll position varying device of the present invention interlocks and controls the positions of multiple stages of take-up rolls and drawing rolls configured by the Nelson method based on preset conditional positions in the roll rotation axis direction and detected current positions. It is a device that can be automatically and arbitrarily changed.

First, to give an example of the means for varying the roll position, two pairs of rolls of the Nelson type are assembled into a box to form a unit, and a slide rail having an electric cylinder is engaged with the roll unit to operate the electric cylinder. Some roll positions can be changed by driving. In addition to the above-mentioned example, as a variable means, a method using a servomotor and a ball screw as a drive source, a method using a pinion gear rotationally driven by a rack and an electric motor, and the like may be used. Therefore, it is not limited to the above example.

In addition, for drive control, the storage unit (roll position varying device) 11 is preliminarily recorded with the optimum number of roll windings for each product type and the roll position at which a yarn path without bending can be constructed. A detection unit (roll position variable device) 14 that detects the current position using a sensor attached to the rail is provided, and based on the stored optimal position and the detected current position, the roll position is adjusted to the optimal position. A control unit (roll position varying device) 12 for controlling the is provided. In this manner, the current position is accurately detected, and the drive unit (roll position variable device) 13 is controlled based on the detected position to perform fine adjustment and automatic variation of the roll position.

Next, the variable mechanism and drive control of the winding machine position variable device will be described. To give an example of means for varying the position of the winder, similar to the roll position varying device, the winder is engaged with a slide rail having an electric cylinder and the electric cylinder is driven to change the position of the winder. is made variable. In addition to the above-mentioned example, as a variable means, a method using a servomotor and a ball screw as a drive source, a method using a pinion gear rotationally driven by a rack and an electric motor, and the like may be used. Therefore, it is not limited to the above example.

As for drive control, similar to the roll position variable device, the storage unit 16 (winder position variable device) is preliminarily recorded with the winder position capable of constructing an unbent yarn path according to each product type. A detection unit (winder position variable device) 19 is provided to detect the current position using a sensor with an electric cylinder or a slide rail attached, and the stored optimum position and the detected current position are also detected. In addition, a control section (winder position variable device) 17 for controlling the winder to the optimum position is provided. In this manner, the current position is accurately detected, and the driving section (winding position variable device) 18 is controlled based on the detected position to perform fine adjustment and automatic variation of the position of the winder.

Further, a common control unit 15 is provided for interlocking and moving the roll position varying device and the winder position varying device. In addition, the common control unit 15 can finely adjust the roll position and winder position according to the yarn position information detected by the yarn position sensor 7 . In this way, by directly detecting the position of the yarn drawn out from each roll during actual production, it is possible to grasp the deviation of the theoretical yarn path and the deviation of the yarn path due to slippage, which varies depending on the type of product, and to achieve higher accuracy without bending. It becomes possible to construct a yarn path. The yarn position sensor 7 uses a laser displacement meter to determine the bending angle of the yarn based on the distance between the sensor and the yarn. Examples include a method of calculating the bending angle of the yarn based on captured moving image information, but the method is not limited to the above example.

By interlocking the position of the roll and the position of the winder in this way, it is possible to change the number of windings for proper heat treatment and to adjust the yarn path to suppress the bending of the yarn path without major equipment modifications. In addition, since the roll position and the winder position are automatically changed collectively according to the conditions of each product type input in the storage units 11 and 15, manpower and labor are not required for the work. . Furthermore, it is possible to reduce production loss (loss due to loss of raw materials and reduced opportunities for production) without stopping the production operation associated with the product changeover work.
Next, the configuration of the variable roll position device and the variable winder position device, which are features of the present invention, will be described in detail.

FIG. 4 is a schematic perspective view showing one embodiment of the configuration of the roll position varying device of the present invention.

4, the roll position varying device of the present invention includes a roll unit 20, a base plate (roll unit) 21, a base plate (roll position varying device) 22, a slide rail 23 (roll position varying device), and an electric cylinder 24 (roll position varying device). equipment).

As for the configuration of the roll position varying device, a roll unit 20 is formed by incorporating two pairs of Nelson type rolls into a box, and the roll unit 20 is fixed to a base plate (roll unit) 21 . A slider base plate (roll position variable device) 22 under the base plate (roll unit) 21 is engaged with an electric cylinder 24 . Subsequently, two slide rails (variable roll position device) 23 are arranged on the base plate (variable roll position device) 22 of the variable roll position device. Since the base plate (roll unit) 21 of the roll unit 20 is engaged via the slide rail (roll position variable device) 23, the roll unit 20 rotates the roll axis on the slide rail (roll position variable device) 23. You can move freely in any direction. Further, by driving the electric cylinder (roll position variable device) 24, the roll unit 20 can be automatically driven. The sliding amount range in the roll axis rotation direction of this roll position variable device must be able to slide the same distance as the length of the roll. It is preferable to make it variable in the range of 0 to 500 mm.

FIG. 5 is a schematic perspective view showing one embodiment of the winding machine position varying device configuration of the present invention.

5, the variable winder position device of the present invention includes a base plate (variable winder position device) 25, a slide rail (variable winder position device) 26, and an electric cylinder (variable winder position device) 27. I have.

As a configuration of the winding machine position varying device, an electric cylinder 27 is engaged with a base plate (winding position varying device) 25 for a slider under the winding machine 9 . Subsequently, two slide rails (winding position varying device) 26 are arranged on the base plate (winding position varying device) 25 of the winder position varying device. Since the winder 9 is engaged via the slide rail (winding position variable device) 26, the winder 9 is free to rotate on the slide rail (winding position variable device) 26 in the roll axis rotation direction. It is possible to go back and forth to Further, by driving the electric cylinder (winding position variable device) 27, the winder 9 can be automatically driven. Since the maximum length of each of the first roll and the second roll is about 500 mm, the total sliding amount range of the winding machine position varying device in the roll axis rotation direction is in the range of 0 to 1000 mm.

By making the roll position and winder position variable and interlockingly controlled, the number of windings can be changed to improve the suitability of the heat treatment and the yarn path can be controlled to prevent the bending of the yarn path without major equipment modifications. Adjustments can be made, and the roll position and winder position can be automatically changed in a batch according to the conditions of each product type, so manpower and labor related to work can be almost eliminated. As a result, it is possible to reduce production loss (loss due to raw material loss and reduced production opportunities) without stopping the production operation associated with the product changeover work.

Further, it is possible to easily finely adjust the spinning conditions, such as polymer type, polymer viscosity, total fineness, single filament fineness, number of filaments, etc., according to the sophistication of the variety.

If the total fineness is in the range of 6 decitex to 40 decitex in terms of drawn yarn, even fine fineness varieties that are susceptible to heat treatment and bending of the yarn path can be preferably produced.

Synthetic fibers that can be produced in the present invention are not particularly limited as long as they are melt-spinnable synthetic fibers such as polyamide and polyester. Further, for example, homopolymers, copolymers, pigments, dyes, matting agents, antifouling agents, fluorescent whitening agents, flame retardants, stabilizers, ultraviolet absorbers, lubricants and the like may be contained.

Synthetic fibers used in the present invention may be single-component spinning or composite-spinning, and in the case of multi-component spinning, examples include core-sheath, side-by-side, sea-island composite, mixed fibers, and the like. Moreover, the cross-sectional shape of the fiber may be round, triangular, flat and irregular, or hollow.
The synthetic fiber, single fiber fineness, and filament number targeted in the present invention can be appropriately selected according to the purpose.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples. Methods for measuring characteristic values in the examples are as follows.

(1) Number of fluff: A laser fluff detector was installed between the second roll (lower) 4b and the winder 9 shown in FIG. 1 to measure the number of fluff per 10,000 km of yarn length.

(2) Number of yarn breakage: The number of yarn breakage per ton of the synthetic fiber wound by the winder 9 was measured.

[Example 1]
After melting nylon 6 chips and simultaneously spinning 8 yarns (yarn Y) of 5 single yarns per yarn from the spinneret, cold air is blown on the discharged yarn to cool and solidify, and spinning oil is applied with a lubricating guide. was given (not shown in FIG. 1). After that, in the first Nelson roll unit position varying device 3 shown in FIG. ° C., the number of winding was 5 times, the film was stretched 2.7 times, and continuously wound with the winding machine of the winding machine position variable device 10 to obtain a nylon 6 multifilament with a standard fineness of 40 dtex and 5 filaments. At this time, the position of the second roll unit can be varied without bending the yarn path between the first roll (lower) 1b and the second roll (upper) 4a and between the second roll (lower) 4b and the yarn position sensor 7. The positions of the device 6 and the winding machine position varying device 10 were set, and these positions were used as reference positions. The number of fluffs of the obtained yarn was 1.1/10,000 km, and the number of yarn breakage was 0.2/ton, which was good.

Next, in the first Nelson roll unit position varying device 3, the roll is taken out with 10 windings, and in the second Nelson roll unit varying device 6, the second roll unit is positioned with respect to the reference position so that the number of windings is 10. A nylon 6 multifilament having a standard fineness of 40 dtex and 5 filaments was obtained in the same manner as described above except that the variable device 6 was slid 250 mm toward the tip of the roll and the winder position variable device 10 was slid 500 mm. For the above sliding amount, confirm in advance that there is no bending of the yarn path between the first roll (lower) 1b and the second roll (upper) 4a and between the second roll (lower) 4b and the yarn position sensor 7. set. The number of fluffs of the obtained yarn was 1.3/10,000 km, and the number of yarn breakage was 0.3 times/ton.

As described above, by using the synthetic fiber manufacturing apparatus of the present invention, it is possible to easily change the optimum number of windings for each type. In addition, since the yarn path can be constructed without bending, and since the yarn path does not have a yarn path guide, there is little fluff and the spinning property is good, and since the number of winding times optimum for the variety can be adopted, the yarn of good quality is obtained. can be obtained.

The apparatus for producing synthetic fibers of the present invention is capable of obtaining high-quality fibers of various varieties with good spinnability when producing a wide variety of synthetic fibers with the same melt spinning apparatus, and reducing the labor and time required for the work of switching varieties. Since it is possible to shorten the time and reduce the loss of production opportunities, it can be suitably used in the production of synthetic fibers.

1a: First roll (upper)
1b: 1st roll (bottom)
2: 1st roll unit 3: 1st roll unit position varying device 4a: 2nd roll (upper)
4b: Second roll (bottom)
5: Second roll unit 6: Second roll unit position variable device 7: Yarn position sensor 8: Yarn guide guide 9: Winder 10: Winder position variable device 11: Storage unit (roll position variable device)
12: Control unit (roll position variable device)
13: Drive unit (roll position variable device)
14: Detector (roll position variable device)
15: common control section 16: storage section (winder position varying device)
17: Control unit (winder position variable device)
18: Drive unit (winder position variable device)
19: Detector (Winding machine position variable device)
20: roll unit 21: base plate (roll unit)
22: Base plate (roll position variable device)
23: Slide rail (roll position variable device)
24: electric cylinder (roll position variable device)
25: Base plate (winder position variable device)
26: Slide rail (winder position variable device)
27: electric cylinder (winder position variable device)
Y: Yarn

Claims (1)

In a synthetic fiber manufacturing apparatus, melt-spun synthetic fiber yarn is drawn and heat-treated in multiple stages with multiple stages of take-up and drawing rolls, and the synthetic fiber yarn is continuously wound using a winder,
The multi-stage take-up and stretching rolls and the winder can be moved and held at any position in the roll rotation axis direction of the winder,
a driving unit 13 capable of moving and holding the multiple stages of take-up and stretching rolls in the direction of the roll rotation axis of the winder;
a detection unit 14 for detecting the positions of the multiple stages of take-up and stretching rolls;
a storage unit 11 for storing arbitrary positions set in advance in order to move the multiple stages of take-up and stretching rolls to arbitrary positions;
Based on the current positions of the multiple stages of take-up and stretching rolls detected by the detection unit 14 and the positions preset in the storage unit 11, the driving is performed so as to move and hold the multiple stages of take-up and stretching rolls. and a control unit 12 for giving instructions to the unit 13.

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