CN115449932A - Method for producing processed yarn and yarn processing machine - Google Patents

Abstract

The invention provides a method for manufacturing a processed yarn and a yarn processing machine, which can avoid the risk of hot adhesion when the yarn is broken and improve the heating efficiency when the yarn is processed while being heated by a heating device. The method for producing a processed yarn comprises a step of heating a running yarn (Y) composed of synthetic fibers by a first heating device (1) (13). The 1 st heating device (13) is provided with a heat source (51) and a heating unit (52). The heating section (52) has a contact surface (56) extending at least in a predetermined extending direction and for contacting the running yarn (Y). In the manufacturing method, the contact surface (56) faces at least downward, and the 1 st heating device (13) is arranged in a manner that the inclination angle of the contact surface (56) relative to the horizontal direction is converged between-60 DEG and +60 DEG in a cross section parallel to both the vertical direction and the extending direction. The temperature of the contact surface (56) is set to a predetermined temperature of 230 ℃ to 350 ℃. In this state, the yarn (Y) is advanced while being in contact with the contact surface (56).

Description

Method for producing processed yarn and yarn processing machine

Technical Field

The present invention relates to a method for manufacturing a processed yarn and a yarn processing machine.

Background

Conventionally, various heating devices for processing (false twisting, etc.) yarns made of synthetic fibers have been known. For example, patent document 1 discloses a heating device using a heat medium, which is a dow (registered trademark of the dow chemical company) (described as a primary heater in patent document 1). In the yarn processing using this heating device, a contact plate (contact member) for bringing the yarn into contact is heated to a predetermined processing temperature by a heat medium. The advancing wire is brought into contact with the contact member (contact method), whereby the wire is heated to the above-mentioned processing temperature. In addition, for example, in a heating device disclosed in patent document 2 (described as the 1 st heating device in patent document 2), the yarn runs in a yarn running space heated by a sheathed heater as a heat source. Thereby, the filament is heated by the gas in the filament traveling space (non-contact method). In the yarn processing using the heating device, the temperature of the yarn running space is set to be higher than the processing temperature and the running speed of the yarn is appropriately set, so that the yarn passing through the yarn running space is heated to a temperature substantially equal to the processing temperature. For example, patent document 3 proposes a mechanism for switching a heating method between a contact method and a non-contact method in a heating device using a sheathed heater as a heat source.

Patent document 1: japanese patent laid-open publication No. 2005-68573

Patent document 2: japanese patent laid-open publication No. 2011-47074

Patent document 3: japanese patent laid-open publication No. 2002-194631

Disclosure of Invention

In general, in the contact system, it is recommended to lower the heating temperature (the set temperature of the contact member) (for example, 225 ℃ or lower in patent document 3). In the non-contact method, it is recommended to increase the heating temperature (the set temperature of the yarn running space) (for example, 420 ℃ or higher in patent document 3). The present inventors have found the following reasons. When the heating temperature is within a certain range (hereinafter referred to as an intermediate stage for convenience of description), if a yarn breakage occurs and the yarn cannot travel normally, the yarn melts in the heating device and adheres (thermally adheres) to the heating device. In order to remove such deposits, it is necessary to stop the heating device for a long time. Further, if the set temperature is sufficiently high, the yarn is likely to sublimate when yarn breakage occurs, and thus the problem of thermal sticking can be avoided. Therefore, conventionally, the heating temperature is set lower than the temperature of the intermediate stage in the contact system and higher than the temperature of the intermediate stage in the non-contact system. On the other hand, in recent years, there has been a demand for a yarn processing method and a yarn processing machine with higher heating efficiency.

The invention aims to avoid the risk of hot sticking when a yarn is broken and improve the heating efficiency when processing is carried out while heating the yarn by a heating device.

A method for producing a processed yarn according to claim 1 is a method for producing a processed yarn including a step of heating a running yarn made of synthetic fibers by a heating device, wherein the heating device includes a heat source and a heating unit heated by the heat source, the heating unit includes a contact surface extending at least in a predetermined extending direction and coming into contact with the running yarn, the contact surface is directed at least downward, the heating device is arranged such that an inclination angle of the contact surface with respect to a horizontal direction in a cross section parallel to both a vertical direction and the extending direction is within a range of-60 ° to +60 °, and the yarn is run while coming into contact with the contact surface in a state where a temperature of the contact surface is set to a predetermined temperature of 230 ℃ to 350 ℃.

In the present invention, the temperature range of 230 ℃ to 350 ℃ is referred to as an intermediate range. It is generally considered that, when the heating temperature is 350 ℃ or lower, there is a risk of hot sticking. However, the present inventors considered that if the contact system is adopted, the problem of the thermal adhesion is avoided, and the heating temperature is set to the temperature in the intermediate stage, the yarn can be heated more efficiently. That is, the heating temperature can be set higher than in the case of the conventional contact system, and therefore, the heating efficiency can be improved. Further, even if the heating temperature is low, the wire can be efficiently heated by the contact surface (that is, the heating efficiency can be improved) in comparison with a conventional non-contact heating device.

In the present invention, even if the temperature (heating temperature) of the contact surface is a predetermined temperature in the intermediate stage in a state where the yarn is normally running (normal state), the yarn can be heated to an optimum processing temperature (the problem of seizing can be avoided) by appropriately setting the type of yarn, the grade (thickness) of the yarn, the running speed of the yarn, and the heating temperature. Further, the contact surface faces at least downward, and the inclination angle of the contact surface with respect to the horizontal direction converges between-60 ° and +60 ° (the details of the definition of the inclination angle will be described in the embodiment described later). Thus, when a yarn breakage occurs, the yarn can be quickly separated from the contact surface by its own weight. Thus, even if yarn breakage occurs, the yarn can be prevented from melting.

The method for producing a processed yarn according to claim 2 is characterized in that, in the above invention 1, the material of the yarn is polyester, and the predetermined temperature is 250 ℃ to 350 ℃.

In the polyester, if the heating temperature is 250 ℃ or higher, the possibility of generating hot sticking is particularly high. At such heating temperatures, it is particularly effective that hot sticking can be avoided by the present invention.

The method for producing a processed yarn of claim 3 is characterized in that, in the above invention 1, the material of the yarn is nylon 6, and the predetermined temperature is 230 ℃ to 350 ℃.

In nylon 6, if the heating temperature is 230 ℃ or higher, the possibility of occurrence of hot sticking is particularly high. At such heating temperatures, it is particularly effective that hot sticking can be avoided by the present invention.

The method for producing a processed yarn according to claim 4 is characterized in that, in the above invention 1, the material of the yarn is nylon 66, and the predetermined temperature is 260 ℃ to 350 ℃.

In nylon 66, if the heating temperature is 260 ℃ or higher, the possibility of occurrence of hot sticking is particularly high. At such heating temperatures, it is particularly effective that hot sticking can be avoided by the present invention.

The method for producing a processed yarn of claim 5 is characterized in that, in any one of the above inventions 1 to 4, the predetermined temperature is 320 ℃ or lower.

When the heating temperature is 350 ℃ or higher, thermal adhesion may easily occur depending on the type and/or thickness of the yarn or the running speed of the yarn. In the present invention, the heating temperature is set to 320 ℃ or lower, whereby the thermal sticking can be avoided more reliably.

A method for producing a processed yarn according to claim 6 is characterized in that, in any one of the above inventions 1 to 5, an electrothermal heater is used as the heat source.

In general, as the heat source, there are a heat source that heats the contact surface using a heat medium and a heat source that heats the contact surface by generating joule heat with an electric heater. In a heat source using a heat medium, generally, there is a limit to the temperature rise of the heat medium, and it is difficult to increase the temperature of the contact surface. In the present invention, the temperature of the contact surface can be easily increased by using the electric heater.

The method for producing a processed yarn according to claim 7 is characterized in that, in the above-described invention 6, the length of the heating device in the extending direction is 0.4m to 1.6 m.

In the present invention, by using a heating device having an appropriate length in the drawing direction, it is possible to cope with various conditions such as the kind and/or thickness of the yarn or the running speed of the yarn.

A yarn processing machine according to claim 8 is provided with a heating device that heats a running yarn made of synthetic fibers, the heating device including a heat source, a heating unit that is heated by the heat source, and a control unit that controls the heat source, the heating unit including a contact surface that extends at least in a predetermined extending direction and that contacts the running yarn, the contact surface being oriented at least downward, the heating device being disposed such that an inclination angle of the contact surface with respect to a horizontal direction in a cross section parallel to both a vertical direction and the extending direction converges between-60 ° and +60 °, and the control unit controlling the heat source so that a temperature of the contact surface becomes a predetermined temperature of 230 ℃ to 350 ℃ when the yarn runs while contacting the contact surface.

In the present invention, as in the case of the invention 1, the risk of thermal adhesion at the time of yarn breakage can be avoided.

The yarn processing machine according to claim 9 is characterized in that, in the yarn processing machine according to claim 8, the yarn is made of polyester, and the predetermined temperature is 250 ℃ to 350 ℃.

In the present invention, as in the case of the invention 2, the risk of thermal sticking can be avoided in the polyester.

The yarn processing machine according to claim 10 is characterized in that, in the 8 th aspect, the yarn is made of nylon 6, and the predetermined temperature is 230 ℃ to 350 ℃.

In the present invention, the risk of thermal sticking can be avoided in nylon 6 as in the case of the 3 rd invention.

The yarn processing machine according to claim 11 is characterized in that, in the 8 th aspect, the yarn is made of nylon 66, and the predetermined temperature is 260 ℃ to 350 ℃.

In the present invention, the risk of hot sticking can be avoided in nylon 66 as in the case of the 4 th invention.

A yarn processing machine according to claim 12 is characterized in that, in any one of the inventions 8 to 11, the heat source includes an electric heater.

In the present invention, as in the case of the 6 th invention, the temperature of the contact surface can be easily increased.

The yarn processing machine according to claim 13 is characterized in that, in the 12 th aspect, the heating device has a length in the extending direction of 0.4m to 1.6 m.

In the present invention, as in the case of the 7 th invention, by using a heating device having an appropriate length in the drawing direction, it is possible to cope with various conditions such as the type and/or thickness of the yarn and the running speed of the yarn.

Drawings

Fig. 1 is a side view of a false twist texturing machine for carrying out the method of producing textured yarn according to the present embodiment.

FIG. 2 is a schematic view of the false twist texturing machine being deployed along the path of the yarn.

FIGS. 3 (a) to (d) are explanatory views showing the heating apparatus 1.

Fig. 4 is an explanatory diagram showing the definition of the inclination angle of the contact surface with respect to the horizontal direction.

Fig. 5 (a) and (b) are explanatory views showing limits of the inclination angle of the contact surface with respect to the horizontal direction.

FIG. 6 is a graph showing the relationship between the crimp contraction rate and the heating temperature in the case of false twisting a yarn of a predetermined thickness using various heating devices.

Description of the symbols:

1: a false twist processing machine (yarn processing machine); 13: 1 st heating means (heating means); 51: a heat source; 52: a heating section; 56: a contact surface; 100: a control device (control unit); y: a silk thread; θ 1: an angle; θ 2: and (4) an angle.

Detailed Description

Next, embodiments of the present invention will be explained. The vertical direction of the paper in fig. 1 is the machine body longitudinal direction, and the horizontal direction of the paper is the machine body width direction. A direction orthogonal to both the longitudinal direction and the width direction of the machine body is a vertical direction (vertical direction) in which gravity acts. The longitudinal direction and the width direction of the body are directions substantially parallel to the horizontal direction.

(integral constitution of false twist processing machine)

First, the overall configuration of a false twist texturing machine 1 (a yarn texturing machine according to the present invention) for carrying out the method of producing a textured yarn according to the present embodiment will be described with reference to fig. 1 and 2. FIG. 1 is a side view of a false twist texturing machine 1. FIG. 2 is a schematic view of the false twist texturing machine 1 being unwound along the path of the yarn Y (yarn path).

The false twist processing machine 1 is configured to be capable of false twisting a yarn Y made of a synthetic fiber (for example, polyester). The yarn Y is, for example, a multifilament yarn composed of a plurality of filaments. Alternatively, the yarn Y may be formed of 1 filament. The false twist processing machine 1 includes a yarn feeding section 2, a processing section 3, and a winding section 4. The yarn feeder 2 is configured to be able to feed the yarn Y. The processing section 3 is configured to draw the yarn Y from the yarn feeding section 2 and perform false twisting. The winding unit 4 is configured to wind the yarn Y processed by the processing unit 3 around the winding bobbin Bw. A plurality of components included in the yarn feeding section 2, the processing section 3, and the winding section 4 are arranged in the longitudinal direction of the machine body (see fig. 2). The machine longitudinal direction is a direction perpendicular to a running surface (paper surface in fig. 1) of the yarn Y formed by the yarn path from the yarn feeder 2 to the winding unit 4 through the processing unit 3.

The yarn feeding section 2 has a creel 7 for holding a plurality of yarn feeding packages Ps, and supplies a plurality of yarns Y to the processing section 3. The processing unit 3 is configured to draw out a plurality of yarns Y from the yarn feeding unit 2 and process the yarns. The processing section 3 is configured such that, for example, a 1 st feed roller 11, a twist stop yarn guide 12, a 1 st heating device 13 (heating device of the present invention), a cooling device 14, a false twisting device 15, a 2 nd feed roller 16, a crosser 17, a 3 rd feed roller 18, a 2 nd heating device 19, and a 4 th feed roller 20 are arranged in this order from the upstream side in the running direction of the yarn. The winding unit 4 includes a plurality of winding devices 21. Each winding device 21 winds the yarn Y false-twisted by the processing section 3 on a winding bobbin Bw to form a winding package Pw.

The false twist texturing machine 1 has a main body 8 and a take-up table 9 arranged at intervals in the machine width direction. The main body 8 and the take-up table 9 are provided to extend substantially the same length in the longitudinal direction of the body. The main body 8 and the winding table 9 are disposed so as to face each other in the body width direction. The false twist texturing machine 1 has a unit cell called span which includes a set of main body 8 and a take-up table 9. In one span, each device is arranged to simultaneously perform false twisting on a plurality of yarns Y running in a state aligned in the longitudinal direction of the machine body. The span of the false twist texturing machine 1 is arranged symmetrically with respect to the center line C of the main body 8 in the machine width direction (the main body 8 is shared by the left and right spans). Further, the plurality of spans are arranged in the body length direction.

(constitution of processing section)

The structure of the processing section 3 will be described with reference to fig. 1 and 2. The 1 st feed roll 11 is configured to unwind the yarn Y from the feed package Ps attached to the yarn feeding section 2 and feed the yarn Y to the 1 st heating device 13. For example, as shown in fig. 2, the 1 st feed roller 11 is configured to feed 1 yarn Y to the 1 st heating device 13. Alternatively, the 1 st feed roller 11 may be configured to be able to feed a plurality of adjacent yarns Y to the downstream side in the yarn running direction. The twist stopping yarn guide 12 is configured such that the twist applied to the yarn Y by the false twisting device 15 does not propagate to the upstream side of the twist stopping yarn guide 12 in the yarn advancing direction.

The 1 st heating device 13 is a device for heating the yarn Y fed from the 1 st feed roller 11 to a predetermined processing temperature. As shown in fig. 2, the 1 st heating device 13 is configured to be able to heat 2 wires Y, for example. The more detailed structure of the 1 st heating device 13 will be described later.

The cooling device 14 is configured to cool the yarn Y heated by the 1 st heating device 13. As shown in fig. 2, the cooling device 14 is configured to cool, for example, 1 wire Y. Alternatively, the cooling device 14 may be configured to cool a plurality of filaments Y simultaneously. The false twisting device 15 is disposed downstream of the cooling device 14 in the yarn running direction, and is configured to twist the yarn Y. The false twisting device 15 is, for example, a so-called disk friction type false twisting device, but is not limited thereto. The 2 nd feed roller 16 is configured to convey the yarn Y treated by the false twisting device 15 to the interlacing device 17. The speed of the yarn Y fed by the 2 nd feed roller 16 is faster than the speed of the yarn Y fed by the 1 st feed roller 11. Thereby, the yarn Y is draw-false-twisted between the 1 st feed roller 11 and the 2 nd feed roller 16.

The crosser 17 is configured to apply crossovers to the yarn Y. The interlacing device 17 has, for example, a known interlacing nozzle for applying interlacing to the yarn Y by an air flow.

The 3 rd feed roller 18 is configured to convey the yarn Y running downstream of the crosser 17 in the yarn running direction to the 2 nd heater 19. For example, as shown in fig. 2, the 3 rd feed roller 18 is configured to feed 1 yarn Y to the 2 nd heating device 19. Alternatively, the 3 rd feed roller 18 may be configured to be able to feed a plurality of adjacent yarns Y to the downstream side in the yarn running direction. Further, the speed of the yarn Y fed by the 3 rd feed roller 18 is slower than the speed of the yarn Y fed by the 2 nd feed roller 16. Thus, the filament Y relaxes between the 2 nd 16 and 3 rd 18 feed rolls. The 2 nd heating device 19 is configured to heat the yarn Y fed from the 3 rd feed roller 18. The 2 nd heating devices 19 extend in the vertical direction and are provided one at each span. The 4 th feed roller 20 is configured to feed the yarn Y heated by the 2 nd heating device 19 to the winding device 21. For example, as shown in fig. 2, the 4 th feed roller 20 is configured to be able to feed 1 yarn Y to the winding device 21. Alternatively, the 4 th wire feed roller 20 may be configured to be able to feed each of the plurality of adjacent yarns Y to the downstream side in the yarn running direction. The speed of the feed of the yarn Y by the 4 th feed roller 20 is slower than the speed of the feed of the yarn Y by the 3 rd feed roller 18. Thus, the filament Y is relaxed between the 3 rd and 4 th feed rolls 18 and 20.

In the working section 3 configured as described above, the yarn Y stretched between the 1 st feed roller 11 and the 2 nd feed roller 16 is twisted by the false twisting device 15. The twist formed by the false twisting device 15 propagates to the yarn stop guide 12, but does not propagate to the upstream side of the yarn stop guide 12 in the yarn advancing direction. The drawn and twisted yarn Y is heated by the 1 st heating device 13 and heat-set, and then cooled by the cooling device 14. The yarn Y is untwisted on the downstream side of the false twisting device 15 in the yarn advancing direction, but the yarn Y is maintained in a state of false twisting in a wavy form (that is, the crimp contraction of the yarn Y is maintained) by the heat setting.

The yarn Y subjected to false twisting is entangled by the entangling device 17 while being loosened between the 2 nd yarn feeding roller 16 and the 3 rd yarn feeding roller 18, and then guided to the downstream side in the yarn running direction. Further, the yarn Y is heat-treated by the 2 nd heating device 19 while being loosened between the 3 rd feed roll 18 and the 4 th feed roll 20. Finally, the yarn Y fed from the 4 th feed roller 20 is wound by the winding device 21.

(constitution of winding part)

The structure of the winding unit 4 will be described with reference to fig. 2. The winding unit 4 includes a plurality of winding devices 21. Each winding device 21 is configured to be able to wind the yarn Y around one winding bobbin Bw. The winding device 21 includes a fulcrum guide 41, a traverse device 42, and a cradle 43. The fulcrum guide 41 is a guide that serves as a fulcrum when the yarn Y moves in the lateral direction. The traverse device 42 is configured to be able to move the yarn Y laterally by the traverse guide 45. The cradle 43 is configured to rotatably support the winding bobbin Bw. A contact roller 46 is disposed near the cradle 43. The contact roller 46 is in contact with the surface of the winding package Pw to apply a contact pressure. In the winding unit 4 configured as described above, the yarn Y fed from the 4 th feed roller 20 is wound around the winding bobbin Bw by the respective winding devices 21 to form the winding package Pw.

(the 1 st heating device)

Next, a more specific configuration of the 1 st heating device 13 will be described with reference to (a) to (d) of fig. 3. Fig. 3 (a) is a view of the 1 st heating device 13 as viewed from the longitudinal direction of the body, and shows the 1 st heating device 13 such that the direction in which the 1 st heating device 13 extends (extending direction described later) is oriented in the right-left direction of the paper. FIG. 3 (b) is a cross-sectional view of Ab-Ab line of FIG. 3 (a). FIG. 3 (c) is a sectional view taken along line Ac-Ac of FIG. 3 (b). Fig. 3 (d) is an Ad-Ad line sectional view of fig. 3 (b). The direction perpendicular to both the longitudinal direction and the extending direction of the machine body is set as the height direction (see fig. 3 (b)). In fig. 3 (a) to (d), the left side of the drawing sheet is one side in the extending direction, and the right side of the drawing sheet is the other side in the extending direction. The one side in the extending direction may be, for example, an upstream side in the running direction of the yarn, but is not limited thereto. In fig. 3 (a) to (d), the upper side of the drawing is set as one side in the height direction, and the lower side of the drawing is set as the other side in the height direction.

The 1 st heating device 13 is configured to heat the running yarn Y. In the present embodiment, the 1 st heating device 13 is configured to be capable of heating 2 yarns Y (yarns Ya, yb. See fig. 3 (b)), for example). The 1 st heating device 13 extends in a predetermined extending direction orthogonal to the longitudinal direction of the body (see fig. 3 (a) and the like). The length of the 1 st heating device 13 in the extending direction is preferably 0.4m to 1.6 m. Alternatively, the length of the 1 st heating device 13 in the extending direction may be, for example, 1.0m to 1.5 m. The 1 st heating device 13 having an appropriate length in the drawing direction is preferably selected according to the conditions such as the type and/or thickness of the yarn or the running speed of the yarn. The 1 st heating device 13 includes a heat source 51 and a heating unit 52. The 1 st heating device 13 simultaneously heats the yarns Ya, yb by bringing the running yarns Ya, yb into contact with the heating portion 52 heated by the heat source 51.

The heat source 51 is, for example, a known sheathed heater (electric heater). Sheathed heaters are devices having an electrical heating wire (e.g., a coil) and a tube surrounding the electrical heating wire. The sheathed heater generates joule heat when current flows through the heating wire. The heat source 51 extends along the extending direction (see fig. 3 (a) and (c)). The heat source 51 is electrically connected to a control device 100 (see fig. 3 (a) and a control unit of the present invention) for controlling the heating temperature of the 1 st heating device 13. The control device 100 is configured to be able to set the heating temperature of the 1 st heating device 13. The control device 100 controls the 1 st heating device 13 based on the value of the set temperature of the 1 st heating device 13. The control device 100 may control the 1 st heating device 13, for example, in consideration of the detection results of the temperature sensor (not shown) that detects the set temperature of the 1 st heating device 13 and the actual temperature of the heating portion 52. The control device 100 can be electrically connected to devices constituting the false twist texturing machine 1 in addition to the 1 st heating device 13.

The heating unit 52 is configured to be heated by heat generated by the heat source 51. The heating portion 52 extends in the extending direction along the heat source 51 (see fig. 3 (a)). The heating part 52 has substantially the same length as the 1 st heating device 13 in the extending direction. For example, when the length of the 1 st heating device 13 in the extending direction is 1.0m, the length of the heating portion 52 in the extending direction is also 1.0m. The heating section 52 includes, for example, two heating members 53 ( heating members 53a and 53 b) and two contact blocks 54 (contact blocks 54a and 54 b). The heating member 53a and the contact block 54a are members for heating the yarn Ya. The heating member 53b and the contact block 54b are members for heating the wire Yb. The member for heating the filament Ya and the member for heating the filament Yb are disposed at positions opposite to each other with the heat source 51 interposed therebetween, for example, in the longitudinal direction of the body.

The means for heating the yarn Ya will be explained. The heating member 53a is made of a metal material having a large specific heat such as brass. The heating member 53a extends in the extending direction along the heat source 51. The heating member 53a is arranged in contact with the heat source 51. The heating member 53a is disposed on one side of the heat source 51 in the longitudinal direction of the body (left side of the paper surface in fig. 3 (b)), for example. The heating member 53a has, for example, a slit 55 (slit 55 a) extending in the extending direction for forming a wire passage. The slit 55a is a slit having an inverted U-shape in a cross section orthogonal to the extending direction. The other side of the slit 55a in the height direction is open. The contact block 54 (contact block 54 a) is accommodated in the slit 55 a.

The contact block 54a is a member forming a yarn channel for the yarn Ya to travel. The contact block 54a is an elongated member made of SUS, for example. The contact block 54a extends at least along the extension direction. The contact block 54a is received in the slit 55 a. The contact block 54a is fixed to the heating member 53a in a state of being in contact with the heating member 53a. The contact block 54a is heated by heat transmitted from the heat source 51 via the heating member 53a. The contact block 54a has a contact surface 56 (contact surface 56 a) for contacting the yarn Y. The contact surface 56a faces at least the other side in the height direction. The contact surface 56a is curved, for example, in a substantially U-shape in a cross section orthogonal to the longitudinal direction of the body (see fig. 3 (d)). The contact surface 56a is curved, for example, in an inverted U shape when viewed from the extending direction (see fig. 3 (b)).

Further, a member for heating the wire Yb will be explained. The heating member 53b is disposed, for example, on the other side (the right side of the paper surface in fig. 3 (b)) in the longitudinal direction of the body of the heat source 51. The heating member 53b is in contact with the heat source 51. The heating member 53b has a slit 55b having the same shape as the slit 55 a. The contact block 54b having the same structure as the contact block 54a is received in the slit 55b. The contact block 54b has a contact surface 56b having the same shape as the contact surface 56 a. The contact surface 56b faces at least the other side in the height direction. Further detailed construction is omitted.

Here, the positional relationship between the 1 st heating device 13 and the twist stop yarn guide 12 and the positional relationship between the 1 st heating device 13 and the cooling device 14 are appropriately set so that the yarn Y reliably comes into contact with the contact surface 56 in a state where the yarn Y normally travels (hereinafter, referred to as "normal state"). Thereby, a force toward the contact surface 56 side is applied at least in the height direction to the yarn Y running along the contact surface 56. Therefore, the yarn Y can be prevented from coming off the contact surface 56 in the normal state.

In the 1 st heating device 13 having the above configuration, the yarn Y is in contact with the contact surface 56 while traveling in a normal state, and thereby receives heat from the heating part 52 via the contact surface 56 (contact method). Thereby, the yarn Y is heated. The temperature of the yarn Y can be set to an optimum processing temperature by appropriately setting the type of the yarn Y, the grade (thickness) of the yarn Y, the traveling speed of the yarn Y, and the heating temperature of the 1 st heating device 13. In the 1 st heating device 13, the heating temperature and the processing temperature do not necessarily coincide. The heating temperature is often set higher than the target value of the processing temperature.

Here, conventionally, it has been avoided to set the heating temperature of the 1 st heating device 13 so as to be contained inside a certain range (hereinafter referred to as an intermediate stage). The reason for this is that, when the heating temperature of the 1 st heating device 13 is set to the temperature in the intermediate stage, if a yarn breakage occurs and the yarn Y cannot travel normally, the yarn Y may be thermally stuck to the device. On the other hand, in recent years, there has been a demand for a yarn processing method and a yarn processing machine with higher heating efficiency. Therefore, in order to avoid the risk of thermal sticking when the yarn is broken and to improve the heating efficiency when the yarn is processed while being heated by the heating device, the 1 st heating device 13 is configured as follows.

(constitution and arrangement of the 1 st heating device)

The configuration and arrangement of the 1 st heating device 13 will be described more specifically with reference to fig. 3 (a) to 5 (b). Fig. 4 is an explanatory diagram illustrating the definition of the inclination angle of the contact surface 56 with respect to the horizontal direction. Fig. 5 (a) and (b) are explanatory views showing limits of the inclination angle of the contact surface 56 with respect to the horizontal direction.

First, the heating temperature of the 1 st heating device 13 (the set temperature of the contact surface 56) can be set to any temperature at least within an intermediate range (for example, 230 to 350 ℃ in the present embodiment). In the 1 st heating device 13, the heating temperature may be set to a temperature lower than 230 ℃. In addition, in the 1 st heating device 13, the heating temperature may be set to a temperature higher than 350 ℃.

As described above, the contact block 54 of the 1 st heating device 13 has the contact surface 56. As shown in fig. 3 (b) and (d), the other side (more precisely, the lower side) of the contact surface 56 in the height direction is open. The term "open" means that no member is disposed on the extension line below the contact surface 56 in the 1 st heating device 13, and a space is formed in which the yarn Y can fall off from the 1 st heating device 13 by its own weight at the time of yarn breakage.

As shown in fig. 3 d and 4, for example, in a cross section orthogonal to the longitudinal direction of the body (in other words, a cross section parallel to both the vertical direction and the extending direction), the contact surface 56 is curved in an inverted U shape. More specifically, the center portion (the portion near the point P0 shown in fig. 4) of the contact surface 56 in the extending direction is substantially parallel to the extending direction. The outer portion of the contact surface 56 in the extending direction is inclined with respect to the extending direction. The vicinity of one end (point P1 shown in fig. 4) and the vicinity of the other end (point P2 shown in fig. 4) of the contact surface 56 in the extending direction are most inclined with respect to the extending direction. For example, when the 1 st heating device 13 is disposed so that the extending direction is substantially parallel to the horizontal direction (see fig. 4), the vicinity of the point P0 is substantially parallel to the horizontal direction in the cross section orthogonal to the longitudinal direction of the body. At this time, the portion near the point P1 and the portion near the point P2 are greatly inclined with respect to the horizontal direction.

As shown in fig. 4, in a cross section orthogonal to the longitudinal direction of the body, the inclination angle of the portion near the point P1 with respect to the horizontal direction is set to an angle θ 1. In this cross section, the inclination angle of the portion in the vicinity of the point P2 with respect to the horizontal direction is set to an angle θ 2. The following describes the detailed definitions of the angles θ 1 and θ 2. The angle θ 1 is an angle formed by a portion (tangent T1) on one side in the extending direction of a tangent line passing through a point P1 of the contact surface 56 and a substantially horizontal straight line L1 extending in the machine body width direction in a cross section orthogonal to the machine body longitudinal direction. When the tangent T1 is located above the straight line L1 (see fig. 4 and 5 (a)), the angle θ 1 has a positive value. When the tangent T1 is located lower than the straight line L1 (see fig. 5 b), the angle θ 1 has a negative value. The angle θ 2 is an angle formed by a portion (tangent T2) on one side in the extending direction of a tangent line passing through a point P2 of the contact surface 56 and a substantially horizontal straight line L2 extending in the machine body width direction in a cross section orthogonal to the machine body longitudinal direction. When the tangent T2 is located above the straight line L2 (see fig. 5 a), the angle θ 2 has a positive value. When the tangent T2 is located lower than the straight line L2 (see fig. 4 and 5 b), the angle θ 2 has a negative value. In a cross section orthogonal to the longitudinal direction of the body, the portion of the contact surface 56 between the point P1 and the point P2 is inclined at an angle between the angle θ 1 and the angle θ 2 with respect to the horizontal direction.

In the present embodiment, the angle of inclination of the contact surface 56 with respect to the horizontal direction is converged between-60 ° and +60 °. More specifically, the inclination angles of all portions of the contact surface 56 from the point P1 to the point P2 (i.e., all portions in the extending direction of the contact surface 56) converge between-60 ° and +60 ° with respect to the horizontal direction. In the present embodiment, when both the angle θ 1 and the angle θ 2 converge between-60 ° and +60 °, the inclination angle of the entire contact surface 56 with respect to the horizontal direction converges between-60 ° and +60 °.

As described above, in the first heating device 13, the space below (directly below) the contact surface 56 is open, and the inclination angle of the contact surface 56 with respect to the horizontal direction is within a predetermined range in the cross section orthogonal to the longitudinal direction of the body. Therefore, when a yarn breakage occurs during the operation of the false twist texturing machine 1, the yarn Y can be quickly separated from the contact surface 56 by its own weight, and the yarn Y can be dropped from the 1 st heating device 13. Therefore, even if the set temperature of the 1 st heating device 13 is the temperature in the intermediate stage, the occurrence of thermal sticking at the time of yarn breakage can be avoided. In the present embodiment, the intermediate range is a temperature range of 230 ℃ to 350 ℃ that has been set to avoid the conventional setting.

(method for producing processed yarn)

Next, a method for producing a processed yarn according to the present embodiment (specifically, a method for producing a processed yarn including a step of heating the yarn Y by the first heating device 13) will be described. In the present embodiment, as described above, in the 1 st heating device 13, the contact surface 56 is directed at least downward. In a cross section orthogonal to the longitudinal direction of the body (a cross section parallel to both the vertical direction and the extending direction), the inclination angle of the contact surface 56 with respect to the horizontal direction is converged to-60 ° to +60 °. The temperature (heating temperature) of the contact surface 56 is set to a predetermined temperature of 230 ℃ to 350 ℃. In this state, the yarn Y is advanced while being in contact with the contact surface 56. By heating the yarn Y in the above manner, the yarn Y can be quickly separated from the contact surface 56 even if yarn breakage occurs for some reason. Therefore, the thermal adhesion of the yarn Y can be avoided at the time of yarn breakage, and the adhesion of the yarn Y to the 1 st heating device 13 can be avoided.

The thickness of the yarn Y to be heated may be any thickness. In addition, the contact method is particularly effective when the wire Y to be heated is thick. In the contact system, even when a thick yarn Y (for example, 80dtex or more) is heated, heat can be reliably transmitted to the yarn Y via the contact surface 56. Thus, the yarn Y can be uniformly heated in the radial direction thereof.

(comparison of conventional production methods)

Next, a comparison of the conventional manufacturing method will be described with reference to fig. 6. The present inventors actually evaluated whether or not the same yarn quality as that obtained by using another conventional heating device (not shown) instead of the 1 st heating device 13 can be obtained by the method for producing a processed yarn using the 1 st heating device 13 according to the present embodiment, as described below.

Fig. 6 is a graph showing a relationship between a Crimp Contraction rate (Crimp restriction) of a yarn Y and a heating temperature in the case of false twisting a yarn Y having a predetermined thickness by using three heating devices described later. The horizontal axis represents the heating temperature, and the vertical axis represents the crimp contraction rate. Fig. 6 shows the relationship between the crimp contraction rate and the heating temperature in the case where the 167dtex (48 filament) yarn Y was heated. The material of the yarn Y for evaluation (yarn material) was polyester. For reference, the melting point of the polyester is 255 to 260 ℃. In general, the preferred processing temperature for the polyester in false twisting is about 180 to 200 ℃ based on the 1 st heating device 13. The running speed (processing speed) of the yarn Y used for the evaluation was 800m/min. Further, by changing the running speed of the yarn Y (that is, changing the time during which the running yarn Y is heated by the 1 st heating device 13), the relationship between the crimp contraction rate and the heating temperature can be appropriately adjusted.

The outline of the three heating apparatuses will be described. The heating device of the 1 st kind ("sheathed heater (contact) 1.0m" in fig. 6) is a heating device having the same configuration as the above-described heating device of the 1 st kind 13. "sheathed heater" means the type of heat source. "contacting" means contacting. "1.0m" indicates that the length of the heating device in the extending direction is 1.0m (hereinafter, the same applies to the 2 nd heating device and the 3 rd heating device). The relationship between the heating temperature and the crimp contraction rate of the heating device of type 1 is indicated by the black circle symbols in fig. 6. The heating device of type 2 ("heat medium (contact) 2.0m" in fig. 6) is a heating device using a known contact method, which is a known heat medium. The 2 nd heating device is called a so-called ballast heater. The heating temperature of the heating device of type 2 is approximately the same as the actual processing temperature of the yarn Y. The relationship between the heating temperature and the crimp contraction rate of the heating device of the 2 nd type is indicated by black squares in fig. 6. The heating device of the 3 rd type ("sheathed heater (non-contact) 1.0m" in fig. 6) is a heating device having substantially the same configuration as the above-described heating device 1 13. In the heating apparatus of the 3 rd type, for example, a slit guide described in japanese patent application laid-open No. 9-291428 is provided in place of the contact block 54 of the heating apparatus 13 of the 1 st type. The heating device of type 3 is a known non-contact type (heating the yarn Y mainly by the heat of the air heated by the heating unit 52). The relationship between the heating temperature and the crimp contraction rate of the heating device of the 3 rd type is indicated by a black-colored triangular mark in fig. 6.

The following will briefly explain the heating apparatus of the 2 nd type (ballast heater) and the heating apparatus of the 3 rd type (non-contact type heating apparatus). Conventionally, the above-described ballast heater has been widely used. However, the ballast heater has the following problems: since there is a limit to the rise of the heating temperature, if the heated yarn becomes thick, the apparatus becomes large in size or the running speed of the yarn Y needs to be reduced. In addition, the ballast heater also has the following problems: in general, the heat radiating portion has a large area, and therefore, power consumption for maintaining the heating temperature is large. Then, a heating apparatus having a sheathed heater as a heat source was manufactured. This makes it possible to easily increase the heating temperature, to reduce the size of the device, and to reduce the area of the heat radiating portion, thereby suppressing an increase in power consumption. However, the present inventors have considered that, in order to avoid the problem of the thermal adhesion, it is necessary to set the heating temperature sufficiently high in the heating device, and it is necessary to adopt a non-contact method so as not to excessively heat the yarn Y.

In the heating apparatus of the 1 st type (the 1 st heating apparatus 13 of the present embodiment), by setting the heating temperature to about 250 to 290 ℃ (inside the solid line frame shown in fig. 6), the curl shrinkage rate can be substantially the same as that in the case where the heating temperature is set to about 180 to 200 ℃ (inside the broken line frame shown in fig. 6) in the heating apparatus of the 2 nd type (the ballast heater). The crimp contraction rate is substantially the same as that obtained when the heating temperature is set to about 420 to 460 ℃ (inside the single-dot chain line shown in fig. 6) in the conventional heating apparatus of type 3 (sheathed heater and non-contact type). The evaluation results described above are always results of comparing physical properties of the yarn when the yarn of a specific type and a specific thickness is run at a specific running speed in the 3 types of heating devices. Therefore, it should be noted that the evaluation result does not mean that the heating temperature of the 1 st heating device 13 is limited to about 250 to 290 ℃.

As described above, it was found that the same yarn quality as that obtained by using the conventional 2 nd and 3 rd heating devices can be obtained by using the 1 st heating device having the same configuration as the 1 st heating device 13. By adopting the contact system and setting the heating temperature to the intermediate level, for example, the following advantages can be obtained. The 1 st heating device 13 can increase the heating temperature as compared with the 2 nd heating device (the ballast heater), and therefore, the device can be made compact and/or the heating efficiency can be improved. Further, since the 1 st heating device 13 can lower the heating temperature as compared with the 3 rd heating device (non-contact type), the power consumption of the heat source 51 can be reduced. Further, in the 1 st heating device 13 having the contact surface 56, heat can be efficiently transferred to the yarn Y via the contact surface 56. Therefore, even when a thick yarn Y is heated, the radially outer and inner portions of the yarn Y can be uniformly heated.

As described above, even if the temperature (heating temperature) of the contact surface 56 is in the intermediate stage in the normal state, the yarn can be heated to the optimum processing temperature (the problem of thermal sticking can be avoided) by appropriately setting the type of yarn, the mark (thickness) of the yarn, the running speed of the yarn, and the heating temperature. The contact surface 56 faces at least downward, and the angle of inclination of the contact surface 56 with respect to the horizontal direction is converged between-60 ° and +60 °. Thus, when a yarn breakage occurs, the yarn Y can be quickly separated from the contact surface 56 by its own weight. This can prevent the yarn Y from melting even if yarn breakage occurs. Therefore, the risk of thermal adhesion at the time of yarn breakage can be avoided, and the heating efficiency can be improved. Further, by adopting the contact system and setting the heating temperature in the intermediate stage, as described above, it is possible to achieve the compactness of the apparatus and/or the reduction of the power consumption.

In the present embodiment, by using a sheath heater as the electric heater as the heat source 51, the temperature of the contact surface 56 can be easily increased to the melting point of the yarn material or higher.

The length of the 1 st heating device 13 in the extending direction is 0.4m to 1.6 m. By using the 1 st heating device 13 having an appropriate length in the drawing direction, it is possible to cope with various conditions such as the kind and/or thickness of the yarn Y and the running speed of the yarn.

Specifically, for example, when the false twisting device 15 is a known PIN type false twisting device, the processing speed is 50 to 100m/min. Thus, when the processing speed is low, the 1 st heating device 13 is preferably short (0.4 m) in the extending direction. In the case where the yarn Y is heated by the green track heater under such a processing speed condition, the length of the green track heater in the extending direction is, for example, 1.0 to 1.2m. For example, when heating a thick yarn Y for industrial materials made of nylon 6, nylon 66, or polyester, the 1 st heating device 13 is preferably long (1.6 m) in the extending direction. The processing speed at this time is 600 to 800m/min. Under the condition of such a processing speed, when the heating wire Y of the track-shaped heater is used, the length of the track-shaped heater in the extending direction is, for example, 2.0 to 2.5m.

Next, a modified example of the above embodiment will be described. However, the same reference numerals are given to members having the same configurations as those of the above-described embodiment, and descriptions thereof are omitted as appropriate.

(1) In the above embodiment, in the 1 st heating device 13, the space below (directly below) the contact surface 56 is always open. However, the present invention is not limited thereto. A cover (not shown) that can be opened and closed or attached and detached for suppressing the entry of the outside air into the yarn running space in which the yarn Y runs, for example, may be provided at the other end in the height direction of the first heating device 1. In this case, since the yarn Y can be quickly separated from the contact surface 56 at the time of yarn breakage, the problem of thermal adhesion can be avoided.

(2) The yarn material of the yarn Y is not limited to the above-described yarn material. For example, nylon 6, nylon 66, or the like may be used as the thread material.

(3) In the embodiments described above, the intermediate level is in the temperature range of 230 ℃ to 350 ℃. However, the present invention is not limited thereto. The lower limit of the intermediate level may be changed depending on, for example, the type of the thread material and the temperature at which the possibility of thermal adhesion is high for each thread material. For example, the temperature at which the polyester is likely to cause hot tack is about 250 ℃ or higher. Thus, for example, in polyesters, the lower limit of the middle range may be 250 ℃ or higher than 250 ℃. Further, the temperature at which nylon 6 is likely to cause hot sticking is about 230 ℃ or higher. Therefore, in nylon 6, the lower limit of the middle range may be 230 ℃ or higher than 230 ℃. Further, the temperature at which nylon 66 is likely to cause hot sticking is about 260 ℃ or higher. Therefore, in nylon 66, the lower limit of the middle range may be 260 ℃ or more than 260 ℃. In addition, when the heating temperature of the 1 st heating device 13 is 350 ℃ or a temperature in the vicinity thereof, the thermal adhesion may be easily generated depending on the conditions such as the type and/or thickness of the yarn Y and the running speed of the yarn. Therefore, the upper limit value of the intermediate gear may be, for example, 320 ℃. This can more reliably prevent the occurrence of thermal sticking. The heating temperature of the 1 st heating device 13 may be a predetermined temperature within the above range.

(4) In the embodiments described above, the contact block 54 is provided as a member having the contact surface 56. However, the present invention is not limited thereto. Instead of the contact block 54, for example, a SUS plate (not shown) formed by sheet metal working so as to have an inverted U-shape when viewed in the extending direction may be accommodated in the slit 55 (see, for example, japanese patent application laid-open No. 2002-194631). A contact surface (not shown) may be formed on such SUS plate.

(5) In the embodiments described above, the contact surface 56 is curved in a cross section orthogonal to the longitudinal direction of the body. However, the present invention is not limited thereto. The contact surface 56 may be, for example, substantially linear in a cross section orthogonal to the longitudinal direction of the housing.

(6) In the embodiments described above, the contact block 54 is housed in the slit 55, and the other side of the slit 55 in the height direction is open. However, the present invention is not limited thereto. For example, the position of the other end of the heating member 53 in the height direction may be substantially the same as the position of the end of the contact surface 56 in the height direction when viewed from the extending direction. In this case, the space below (directly below) the contact surface 56 may be said to be open.

(7) In the embodiments described above, the 1 st heating device 13 for heating the heating unit 52 by the sheath heater is provided in the false twist processing machine 1. However, the present invention is not limited thereto. Instead of the 1 st heating device 13, the above-described Dairy heater may be provided in the false twist processing machine 1. For example, in the case where a yarn material having a low melting point is present, the above-described processing method (a method for producing a processed yarn) may be carried out in a tawner heater.

(8) In the embodiments described above, the 1 st heating device 13 is configured to be able to heat 2 yarns Y. However, the present invention is not limited thereto. The 1 st heating device 13 may be configured to heat 1 yarn Y. Alternatively, the 1 st heating device 13 may be configured to heat 3 or more threads Y.

(9) The present invention is not limited to the false twisting machine 1, and can be applied to a known false twisting machine (not shown) having another configuration. For example, the present invention can be applied to a false twist processing machine (not shown) described in japanese patent application laid-open No. 2009-74219. The false twisting machine is configured to be capable of doubling 2 yarns to form 1 yarn. The false twist processing machine is configured to be capable of winding 1 yarn after doubling or 2 yarns without doubling on a single cradle. As an example, the present invention can be applied to such a false twisting machine. Alternatively, the present invention can be applied to a yarn processing machine that performs processing while running a yarn (not shown), such as a known pneumatic processing machine (not shown), in addition to the false twist processing machine.

Claims (13)

1. A method for producing a processed yarn, comprising a step of heating a running yarn composed of synthetic fibers by a heating device,

the heating device includes a heat source and a heating unit heated by the heat source,

the heating section has a contact surface extending at least in a predetermined extending direction for contacting the running yarn,

the contact surface is at least directed downward,

the heating device is disposed such that an inclination angle of the contact surface with respect to a horizontal direction is converged between-60 ° and +60 ° in a cross section parallel to both a vertical direction and the extending direction,

the yarn is run while being in contact with the contact surface in a state where the temperature of the contact surface is set to a predetermined temperature of 230 ℃ to 350 ℃.

2. The manufacturing method of processing yarn according to claim 1,

the material of the above-mentioned silk threads is polyester,

the predetermined temperature is 250 ℃ to 350 ℃.

3. The manufacturing method of processing yarn as claimed in claim 1,

the material of the above-mentioned silk threads is nylon 6,

the predetermined temperature is 230 ℃ to 350 ℃.

4. The manufacturing method of processing yarn according to claim 1,

the material of the above-mentioned thread is nylon 66,

the predetermined temperature is 260 ℃ to 350 ℃.

5. The manufacturing method of processing wire according to any one of claims 1 to 4,

the predetermined temperature is 320 ℃ or lower.

6. The manufacturing method of processing wire according to any one of claims 1 to 5,

an electric heater is used as the heat source.

7. The manufacturing method of processing yarn according to claim 6,

the length of the heating device in the extending direction is 0.4m to 1.6 m.

8. A yarn processing machine having a heating device for heating a running yarn made of synthetic fibers,

the heating device includes a heat source, a heating unit heated by the heat source, and a control unit for controlling the heat source,

the heating section has a contact surface extending at least in a predetermined extending direction for contacting the running yarn,

the contact surface is at least directed towards the lower side,

the heating device is disposed so that an inclination angle of the contact surface with respect to a horizontal direction is converged to-60 to +60 DEG in a cross section parallel to both a vertical direction and the extending direction,

the control unit controls the heat source so that the temperature of the contact surface becomes a predetermined temperature of 230 ℃ to 350 ℃ when the wire travels while contacting the contact surface.

9. A machine according to claim 8,

the material of the above-mentioned threads is polyester,

the predetermined temperature is 250 ℃ to 350 ℃.

10. The machine according to claim 8,

the material of the above-mentioned silk threads is nylon 6,

the predetermined temperature is 230 ℃ to 350 ℃.

11. The machine according to claim 8,

the material of the above-mentioned thread is nylon 66,

the predetermined temperature is 260 ℃ to 350 ℃.

12. The machine according to any of the claims 8 to 11,

the heat source is provided with an electric heater.

13. The machine according to claim 12,

the length of the heating device in the extending direction is 0.4m to 1.6 m.

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