JP2013124432A - Aeration transport belt of fiber bundle bundling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aeration transporting belt of a fiber bundle bundling device capable of maintaining the whole surface of the belt hard to be electrified, manufacturing a belt material without taking efforts and improving its durability.SOLUTION: An aeration transporting belt 15 comprises a coated film 32 made of conductive polymer on the whole surface. The belt is formed into a sheet-like body, in which a thread 31 has an intersection part as like a fabric and a knit and the whole surface 32 thereof is coated with the film 32.

Description

  The present invention relates to a ventilation conveying belt of a fiber bundle focusing device, and more specifically, for example, a ventilation of a fiber bundle focusing device that is arranged downstream of a drafting device (draft part) of a spinning machine and focuses a fiber bundle drafted by the drafting device. It relates to a conveyor belt.

  Various fiber bundle concentrating devices have been proposed in which the drafted fiber bundle is preliminarily converged before twisting to improve yarn quality such as reduction of fluff. An endless ventilating belt (perforated belt) is used for focusing and transferring the fiber bundle, which is a basic function.

  In the fiber bundle concentrating device, a fiber bundle such as cotton passes on the ventilation conveyance belt, so that static electricity is easily generated. Therefore, the ventilation conveyance belt is charged and the fibers are easily attached. Conventionally, a transport belt that suppresses static electricity from being charged has been proposed (see Patent Document 1).

  Patent Document 1 proposes a transport belt made of an air-permeable woven material made from synthetic filaments, and having a static-reducing substance added to the woven material. As a form in which the static reducing substance is added to the woven material, a certain percentage of the warp or weft of the woven material is a metal thread, and at least a certain percentage of the synthetic filament is a monofilament, and this monofilament is at least one chemical A material that has been made electrically conductive by adding an additive to a synthetic material has been proposed. It has also been proposed that at least some percent of the synthetic filament or woven material is metallized.

JP 2004-346473 A

  However, all of the transportation belts proposed in Patent Document 1 prevent or suppress the transportation belt from being charged with static electricity by mixing a conductive material in a part of the woven material. For this reason, the transport belt includes a portion that is easily charged with static electricity and a portion that is difficult to be charged, and the charge suppressing effect is low as compared with the case where the entire outer surface of the transport belt is difficult to be charged. Also, when a certain percentage of warp or weft of the woven material is a metal yarn, or a percentage of the filament is made a conductive filament by adding a chemical additive to the synthetic material, the woven material is used. It takes a lot of time to make the woven material. Also, it is difficult to metallize synthetic filaments and woven materials so that the metal is difficult to peel off.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to save time and labor for the production of the belt base material, maintain the entire surface of the belt in a state where it is difficult to be charged, and improve its durability. An object of the present invention is to provide a ventilating belt for a fiber bundle concentrating device.

  In order to achieve the above object, the invention according to claim 1 is a ventilation transport belt of a fiber bundle concentrating device in a spinning machine for converging a fiber bundle drafted by a draft part, and the entire belt is made of a conductive polymer. It is covered with a membrane. Here, the “conductive polymer film” is not only a film formed of only a conductive polymer, but also facilitates the formation of a film by a conductive polymer, or a film property such as flexibility. It also means a film containing an additive substance that improves the durability and the like.

  In the present invention, since the entire belt is covered with a conductive polymer film, some of the yarns constituting the belt are made into filaments that are made electrically conductive by adding metal yarns or chemical additives. In contrast, the entire outer surface of the ventilating and conveying belt is not easily charged with static electricity. In addition, since the entire belt is coated with a conductive polymer film, unlike the case where a part of the belt is coated, the film is difficult to peel off from the belt when the ventilation transport belt slides on the surface of the suction pipe. The effect of preventing or suppressing static electricity is maintained. In addition, since the entire belt is covered with a conductive polymer film, some of the yarns constituting the belt are prevented from being charged as filaments made electrically conductive by the addition of metal yarns or chemical additives as in the prior art. Compared to the production of a belt having a charge suppressing function, the production of the belt substrate does not take time. Therefore, the production of the belt base material does not take time, and the entire surface of the belt is maintained in a state where it is difficult to be charged, and the durability can be improved.

  According to a second aspect of the invention, in the first aspect of the invention, the belt is formed of a sheet-like body configured such that yarns have crossing portions, such as a woven fabric or a knitted fabric, and the sheet-like body. Is entirely covered with the membrane.

  In the present invention, since the belt is formed of a sheet-like body configured such that the yarn has an intersecting portion like a woven fabric or a knitted fabric, the belt is used as a ventilation conveyance belt of an existing fiber bundle focusing device. Can be applied to belts. In addition, the yarn constituting the sheet-like body is not covered with a conductive polymer film when the sheet-like body is woven or knitted. There is no possibility of peeling from.

  According to a third aspect of the present invention, there is provided the sheet-like body according to the first aspect, wherein the belt is woven or knitted so that the yarn entirely covered with the membrane has an intersection. It is formed with. Therefore, the sheet-like body is in a state in which any part of the outer surface is reliably covered with the conductive polymer film.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the film includes a binder. When a sheet or thread is covered with a conductive polymer film, the film may be formed only with the conductive polymer, but it is easier to form the film if it is formed with a binder. become.

  According to the present invention, there is provided a ventilating and conveying belt for a fiber bundle concentrating device that does not require labor for the production of a belt base material, maintains the entire surface of the belt in a state where it is difficult to be charged, and can improve the durability thereof. be able to.

(A) is a partially broken schematic side view of a fiber bundle focusing device of one embodiment, (b) is a schematic perspective view of a ventilating and conveying belt, (c) is a partial schematic diagram of the ventilating and conveying belt, and (d) is a schematic cross section. Figure. (A), (b) is the partial schematic diagram of the ventilation conveyance belt in another embodiment. The schematic side view which shows the fiber bundle focusing apparatus of another embodiment.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIG.
As shown in FIG. 1A, the fiber bundle concentrating device 11 is provided on the downstream side of the final delivery roller pair 12 of the draft part (draft device). The fiber bundle concentrating device 11 includes a delivery unit 13, a suction pipe 14, a ventilation conveyance belt 15, and a guide unit 16. The delivery unit 13 includes a bottom nip roller 17a formed on a rotary shaft 17 disposed in parallel with the front bottom roller 12a of the final delivery roller pair 12, and a top nip roller that is pressed against the bottom nip roller 17a via a ventilation conveyance belt 15. 18. The top nip roller 18 is supported by a weighting arm (not shown) via a support member 19 every two spindles, like the front top roller 12b of the draft device. The support member 19 is formed integrally with the support member of the front top roller 12b. The suction pipe 14 is provided on the upstream side in the moving direction of the fiber bundle F with respect to the nip point of the delivery unit 13. The ventilation conveyance belt 15 is rotated while being partially wound around the suction pipe 14, partially on the guide portion 16, and partially on the bottom nip roller 17 a, and conveys the fiber bundle F.

  The fiber bundle concentrating device 11 is basically configured in the same manner as a known fiber bundle concentrating device except for the ventilation conveyance belt 15. The rotation of the front bottom roller 12a is transmitted to the rotation shaft 17 via a gear portion formed on the front bottom roller 12a, an intermediate gear 20 and a gear portion formed on the rotation shaft 17. Yes.

  The suction pipe 14 is connected to a duct (not shown) as a suction source (negative pressure source) for the fiber bundle concentrating device 11 through a connection pipe 21. In the vicinity of the lower portion of the guide portion 16, the tip of a suction nozzle 22 of a single type pneumatic device that serves to suck the fiber bundle F fed from the draft device when the yarn breaks is disposed. The proximal end of the suction nozzle 22 is connected to a pneumatic duct (not shown) common to all weights.

  The suction pipe 14 has a guide surface that is curved so as to be convex outward, and suction slits 23 extending in a direction intersecting the longitudinal direction of the suction pipe 14 have a predetermined pitch (spindle weight pitch). A plurality are formed. The suction slit 23 is formed so as to extend over almost the entire length in the width direction of the guide surface (direction perpendicular to the longitudinal direction of the suction pipe 14). The suction pipe 14 is assembled to the fiber bundle concentrating device 11 in a state where the guide surface corresponds to the passage path of the fiber bundle F, and a part of the ventilation conveyance belt 15 is wound around the guide surface.

  The ventilating and conveying belt 15 is formed of a sheet-like body configured such that the yarn 31 has a crossing portion like a woven fabric, and the whole of the yarn 31 is a conductive polymer film in a state of constituting the sheet-like body. 32. The thickness of the film 32 is, for example, about 0.1 to several μm. More specifically, the ventilating and conveying belt 15 is formed in a seamless loop shape from a plain weave fabric. In this embodiment, the woven fabric woven in a cylindrical shape is subjected to a fusion treatment and then subjected to a conductive polymer coating treatment in a state of being cut to a predetermined width. As shown in FIGS. 1C and 1D, a core-sheath heat-sealing yarn is used for the yarn 31 constituting the woven fabric. And as for the thread | yarn 31, the sheath part 31a is melt | fused by the cross | intersection part of the thread | yarn 31 which comprises a textile fabric. In this embodiment, the core 31b and the sheath 31a are made of polyamide in the thread 31, the polyamide 31b is made of polyamide having a melting point of 260 ° C, and the sheath 31a is made of polyamide having a melting point of 220 ° C. Yes. Moreover, in this embodiment, the core part 31b is comprised with the monofilament.

  The woven fabric is woven with yarns 31 having a diameter (thickness) of 0.05 to 0.15 mm. The thinner the yarn, the better the suction action against the fiber bundle F being spun, but the strength of the ventilating and conveying belt 15 becomes insufficient, so the thickness in the above range is preferred. The aperture ratio is 25 to 40%. Here, the opening ratio is defined by the area of a portion surrounded by the center line of two adjacent circumferential yarns 33a extending in the circumferential direction and two axial yarns 33b extending in the axial direction. It is defined by (A2 / A1) × 100 (%), where A2 is the area of the portion (opening) surrounded by 33a and the two axial threads 33b.

  The sheet-like body constituting the air-conveying belt 15 is not fused at all the intersections of the yarns 31, but the fusion region where the fused intersections are adjacent to each other and the intersection where the fusion is not fused are adjacent. The intersecting portions are partially fused so that the non-fused regions are alternately present at least in the longitudinal direction of the ventilation conveyance belt 15. In this embodiment, the fusion region and the non-fusion region are provided so as to alternately exist in the width direction of the ventilation conveyance belt 15.

  Next, the manufacturing method of the ventilation conveyance belt 15 is demonstrated. Since it is low in productivity to manufacture the air-conveying belt 15 from the beginning to the width of the final product and then to perform the fusion treatment and the conductive polymer coating treatment, first, multiple times the width of the final product (for example, Prepare a cylindrical woven fabric with a length of ten times. Since the width of the ventilation conveyance belt 15 is about 15 to 25 mm, a cylindrical fabric having a length of several hundred mm is prepared. Then, the fusion treatment is performed using an apparatus including a fusion treatment portion in which a plurality of holes are formed in a cylindrical body having substantially the same outer shape as the inner diameter of the cylindrical fabric. The fusing process is the same as the method disclosed in Japanese Patent Application Laid-Open No. 2007-126798.

  After the cylindrical woven fabric that has been subjected to the fusing process is cut to a predetermined width and then the conductive polymer coating process is performed, the ventilating and conveying belt 15 is completed. As the conductive polymer, conjugated polymers such as polythiophenes, polypyrroles, and polyanilines are known, but any conductive polymer may be used for the conductive polymer coating treatment.

  In the coating method, the cylindrical fabric cut to a predetermined width is dipped in a solution containing a conductive polymer and then dried. The solution is preferably mixed with a binder resin component in order to improve the adhesion between the conductive polymer and the cylindrical fabric. As the binder resin, those having good compatibility with a belt base material, that is, a cylindrical fabric are used. The relationship between the thickness of the film 32 to be coated on the sheet-like body and the concentration of the conductive polymer solution is obtained in advance by a test, and the cylindrical fabric is impregnated with a solution having a concentration corresponding to the desired thickness. During drying, heating is performed at 80 to 120 ° C. In addition to facilitating evaporation of the solvent, the role of heating is to dissolve the binder resin in the solvent.

  In the method of immersing a cylindrical woven fabric in a solution containing a conductive polymer, as in the prior art, a part of the yarn that is a material of the woven fabric constituting the ventilating and conveying belt 15 is electrically added by adding a metal yarn or a chemical additive. This is easier than the case where the filament is made conductive, or the case where only a target portion of the yarn is covered with a film.

Next, the operation of the fiber bundle concentrating device 11 configured as described above will be described.
When the spinning machine is operated, the fiber bundle F is drafted by the draft device and then guided from the final delivery roller pair 12 to the fiber bundle converging device 11. The bottom nip roller 17a and the top nip roller 18 are rotated slightly faster than the surface speed of the final delivery roller pair 12, and the fiber bundle F is turned after passing the nip point between the bottom nip roller 17a and the top nip roller 18 in an appropriate tension state. It moves downstream while being twisted.

  Further, the suction action of the duct extends to the suction pipe 14 via the connection pipe 21, and the suction action of the suction slit 23 formed on the guide surface reaches the fiber bundle F via the ventilation conveyance belt 15. Then, the fiber bundle F moves while being sucked and focused at a position corresponding to the suction slit 23. Therefore, as compared with a spinning machine not equipped with the fiber bundle concentrating device 11, the generation of fluff and cotton falling are suppressed and the yarn quality is improved.

  Since the bottom nip roller 17a around which the ventilation conveyance belt 15 is wound rotates at a rotation speed (200 to 300 rpm) substantially the same as the front bottom roller 12a of the draft device, static electricity is easily generated in the ventilation conveyance belt 15, The generated static electricity easily charges the ventilating and conveying belt 15. If the ventilation / conveyance belt 15 is in a state in which static electricity is likely to be charged, fibers easily adhere to the ventilation / conveyance belt 15. However, the ventilating and conveying belt 15 is formed of a sheet-like body configured such that the yarn 31 has an intersection, and the entire sheet-like body is covered with a film 32 containing a conductive polymer. The entire outer surface of the belt 15 is not easily charged with static electricity.

  When a metal film is formed on a synthetic filament or woven material, the adhesion between the synthetic filament or woven material and the metal film is low and the film is easy to peel off. However, the conductive polymer film 32 is less than the metal film. Thus, the compatibility with the yarn 31 is good and the adhesiveness is high, and the film 32 is difficult to peel from the yarn 31, that is, from the sheet-like body. Further, since the entire sheet-like body is covered with the film 32, unlike the case where a part of the sheet-like body is covered, the film 32 is removed from the sheet-like body when the ventilation transport belt 15 slides on the surface of the suction pipe 14. It is difficult to peel off, and the effect of preventing static charge or suppressing charge is maintained. Further, since the film 32 is formed with a thickness of, for example, about 0.1 to several μm, the flexibility of the ventilation conveyance belt 15 is not impaired, and the ventilation conveyance belt 15 is formed on the suction pipe 14. Since it moves smoothly in a state familiar with the outer shape, the focusing / transfer function of the fiber bundle F is not deteriorated.

When a surfactant is used as an antistatic agent in a plastic material, the surface resistance value, which is generally an index of antistatic ability, is 10 ⁷ to 10 ⁹ [Ω / □], and the static electricity charged on the ventilating and conveying belt 15 is discharged. It is hard to do. On the other hand, when coated with a film 32 containing a conductive polymer, the surface resistance value, which is an index of antistatic ability, can be 10 ³ to 10 ⁶ [Ω / □], and charged static electricity can be reduced. It becomes easy to discharge. The surface resistance value was not measured with the film 32 formed on the ventilation conveyance belt 15, but was measured with a conductive polymer film formed on a glass substrate.

According to this embodiment, the following effects can be obtained.
(1) The entire ventilation belt 15 is covered with a conductive polymer film 32. Therefore, the production of the belt base material does not take time, and the entire surface of the belt is maintained in a state where it is difficult to be charged, and the durability can be improved.

  (2) The ventilating and conveying belt 15 is formed of a sheet-like body configured such that the yarn has an intersecting portion like a woven fabric or a knitted fabric, and the entire sheet-like body is covered with the film 32. Therefore, the present invention can be applied to a belt that is used as a ventilation conveyance belt of an existing fiber bundle focusing device. Further, the yarn 31 constituting the sheet-like body is not covered with the conductive polymer film 32 when the sheet-like body is woven or knitted. There is no possibility that 32 will peel from the thread 31.

  (3) The conductive polymer film 32 is not formed of only the conductive polymer, but is formed in a state containing a binder resin. Therefore, the film 32 can be easily formed and the adhesion between the film 32 and the thread 31 can be improved as compared with the case where the film 32 is formed only from the conductive polymer. It becomes difficult to peel off from the body.

  (4) The conductive polymer film 32 has a thickness of 0.1 to several μm. Therefore, without damaging the flexibility of the ventilation / conveyance belt 15, it can move smoothly in a state familiar with the outer shape of the suction pipe 14, and the function of converging and transferring the fiber bundle is not deteriorated.

  (5) Since a fused yarn is used as the yarn 31 constituting the sheet-like body forming the ventilation conveyance belt 15, and a part of the intersecting portion of the yarn 31 is fused, depending on the amount of the fused portion. The flexibility and durability of the ventilation conveyance belt 15 can be improved.

(6) The surface resistance value of the ventilation conveyance belt 15 can be set to 10 ³ to 10 ⁶ [Ω / □], and the static electricity charged in the ventilation conveyance belt 15 is easily discharged.
In addition, you may change this embodiment as follows.

  The ventilating and conveying belt 15 only needs to be covered with the conductive polymer film 32, and the ventilation belt 15 is covered with the conductive polymer film 32 in a state in which a sheet-like body is formed with the thread 31. Not exclusively. For example, as shown in FIG. 2 (a), the belt 31 may be formed of a sheet-like body that is woven or knitted so that the yarn 31 that is entirely covered with the film 32 has an intersection. . In this case, the sheet-like body is in a state in which any part of the outer surface is reliably covered with the conductive polymer film 32. For example, a monofilament yarn is used as the yarn 31 instead of a fused yarn. Further, the yarns 31 are not bonded (fused) to each other at the intersection.

  (Circle) the sheet-like body which forms the ventilation conveyance belt 15 may be formed with the weaving methods other than plain weave, for example, the textile fabric woven by twill. Further, the sheet-like body may be formed by knitting instead of woven fabric.

  A sheet-like body configured such that the yarn 31 has an intersection is not limited to a woven fabric or a knitted fabric. For example, as shown in FIG. 2B, the yarn layer is composed of a plurality of yarns 31 arranged in one direction, and the yarn 31 is arranged in a direction orthogonal to the yarn 31 of the yarn layer. The sheet layer may be formed by laminating the two yarn layers in two layers, using a fused yarn as at least a portion of the yarn 31, and fusing at least a portion of the intersecting portion of the yarn. The yarns 31 of the yarn layers laminated in two layers may be arranged in a direction that crosses obliquely rather than orthogonally.

  ○ The fused yarn is not limited to one in which both the sheath portion 31a and the core portion 31b are made of polyamide. For example, the sheath portion 31a and the core portion 31b may both be made of polyester, or the sheath portion 31a may be made of polyester and the core portion 31b may be made of polyamide.

In the case where the intersecting portions of the yarns 31 constituting the woven fabric or the knitted fabric are fused, the fused yarns may be used only for any one of the yarns 31 constituting the intersecting portion.
In the ventilating and conveying belt 15 formed by forming the conductive polymer film 32 on the entire sheet-like body after the sheet-like body is formed, the thread 31 constituting the sheet-like body has crossing portions. It does not need to be fused. That is, the ventilating and conveying belt 15 may be manufactured by impregnating a sheet-like body woven or knitted with the yarn 31 that is not a fused yarn into a solution containing a conductive polymer.

  The sheet-like body, that is, the belt base material is not limited to a woven fabric, a knitted fabric, or a structure in which the yarn 31 has an intersection as shown in FIG. 2B, for example, a belt formed of a fiber reinforced resin. A plurality of holes may be formed on the surface.

  In order to improve the adhesion between the air-conveying belt 15 and the conductive polymer, a belt base material such as a cylindrical fabric may be pretreated and then impregnated with a solution containing the conductive polymer. Examples of the pretreatment include corona discharge treatment, plasma treatment, and primer treatment, which are generally known as resin surface modification (roughening) methods.

Even when the conductive polymer coating treatment is performed on the yarn 31 forming the belt substrate instead of the belt substrate, the yarn 31 may be subjected to the same pretreatment.
The conductive polymer coating treatment is not limited to a method of impregnating the sheet-like body or thread 31 with a solution containing a conductive polymer. For example, a solution containing a conductive polymer may be applied to or sprayed on the sheet-like body or thread 31.

The conductive polymer film 32 may be a film 32 made of only a conductive polymer without containing a binder.
(Circle) you may make it contain the crosslinking agent in the solution containing a conductive polymer, and form the film | membrane 32 in the state by which the conductive polymer was bridge | crosslinked.

  ○ When conducting a conductive polymer coating treatment on a cylindrical fabric as a belt base material, the cylindrical fabric is not subjected to the conductive polymer coating treatment after the cylindrical fabric is cut into the width of the ventilating and conveying belt 15; You may cut | disconnect to the width | variety of the ventilation conveyance belt 15 after performing a molecule | numerator coating process.

  The delivery unit 13 of the fiber bundle concentrating device 11 is not limited to a configuration equipped with a nip roller pair including a bottom nip roller 17 a and a top nip roller 18. For example, as shown in FIG. 3, a suction pipe 35 having a substantially oval cross section is provided, and a suction slit 35 a is formed at a predetermined position of the suction pipe 35. Then, the ventilation conveyance belt 15 is slidably wound around the outer periphery of the suction pipe 35 and the tension roller 36. Alternatively, the ventilation transport belt 15 may be driven by transmitting the rotation of the front top roller 12 b to the top nip roller 18 via the gear 37 and driving the top nip roller 18 while being pressed against the ventilation conveyance belt 15.

The following technical idea (invention) can be understood from the embodiment.
(1) In the invention described in claim 2, a fused yarn is used as at least a part of the yarn, and a part of the intersecting portion of the yarn is fused.

  F ... fiber bundle, 11 ... fiber bundle converging device, 15 ... ventilated conveyor belt, 31 ... thread, 32 ... membrane.

Claims (4)

  A fiber bundle concentrating device vent conveying belt in a spinning machine for converging a fiber bundle drafted by a draft part, wherein the entire belt is coated with a conductive polymer film. Conveyor belt.   2. The fiber bundle according to claim 1, wherein the belt is formed of a sheet-like body configured such that a yarn has an intersecting portion like a woven fabric or a knitted fabric, and the sheet-like body is entirely covered with the film. Ventilation conveyor belt for focusing device.   2. The fiber bundle concentrating device according to claim 1, wherein the belt is formed of a sheet-like body formed by weaving or knitting the yarn, the entirety of which is covered with the membrane, so as to have an intersection. belt.   The ventilation conveyance belt of the fiber bundle focusing device according to any one of claims 1 to 3, wherein the film includes a binder in addition to the conductive polymer.