TW201341611A - Method for producing slit yarn, and apparatus and knitted fabric thereof in circular knitting machine - Google Patents

Abstract

A method for knitting a slit yarn made of a sheet-like raw material and having a width of several millimeters by a knitting machine while the slit yarn is covered with a core yarn, an apparatus used therefor and a knitted fabric obtained thereby are provided. With regard to feed devices, besides a slit yarn feeding device provided for feeding a slit yarn (SY), there is a yarn feeding device for feeding a core yarn (CY). A covering means (80) for wrapping the core yarn (CY) with the slit yarn (SY) is provided between the slit yarn feeding device and a knitting portion (50). Also provided is a guide means (12, 61, 63) for guiding the slit yarn (SY) from the slit yarn feeding device to the covering means (80) such that the slit yarn (SY) will not twist and not crease, and a front and back thereof will not be inverse.

Description

Method for weaving slit film flat yarn in circular knitting machine, knitting device for slitting flat yarn and braided fabric

The present invention relates to a method of knitting a slit yarn covering a core wire (core wire) while using a sheet-like blank such as a film or a nonwoven fabric, and knitting the same by a knitting machine. The device used and the knitted fabric that can be obtained by the device.

Conventionally, a knitting machine uses a knitting yarn formed by weaving and false-twisting a fiber of a chemical fiber short fiber and a filament of a natural fiber or a chemical fiber, and weaving. In recent years, a flat-shaped blank called a cut-off film has been developed, and a film made of polypropylene or polyethylene or the like and a non-woven fabric having a structure in which fibers are arranged in parallel or in an indefinite direction are laminated. The raw material was cut to a width of several mm to form a slit film flat yarn.

Further, a filament yarn which is not subjected to crimping in a synthetic fiber factory is called a flat yarn, and a flat yarn is conceived from the name of the flat yarn, but the flat yarn is a raw yarn which is not subjected to crimping, and is not necessarily flat. Yarn. In order to distinguish from the flat yarn, in the present specification, regardless of whether the yarn width is cut into a sheet-like blank of 1 to 7 mm, a sheet-like blank having a yarn width of 1 to 7 mm is referred to as a slit film flat yarn.

Patent Document 1 listed below describes that the date is slenderly cut. A seamless woven fabric in which the yarn of the paper is twisted and twisted and wound on a core yarn to be woven, and then woven by the yarn.

Patent Document 2 listed below discloses a cloth-like body in which a biodegradable flat yarn composed of a plurality of layers is woven by a flat strip-shaped strip. As the knit structure, there are well-known knitting methods such as warp knitting, weft knitting, raschel warp knitting, and tricot warp knitting.

Patent Document 3 describes a polyester knitted fabric in which a flat yarn (green yarn) and a false twisted textured yarn are woven together. This knitted fabric is a double-sided mesh of a well-known knitting structure using a double needle bed circular knitting machine (model of Fukuhara Seiki Co., Ltd.: LIL-4AL).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Special Opening 2005-023445

[Patent Document 2] Japanese Special Opening 2005-248407

[Patent Document 3] Japanese Special Open 2010-144288

As described above, Patent Documents 1 to 3 are related to a method of a flat yarn and a flat yarn, a knitted fabric using the yarn, and a method and apparatus for knitting the yarn by a knitting machine, but there is no description of cutting the film. The technique in which the flat yarn covers the core wire and is woven by a knitting machine. When the above-mentioned slit film flat yarn knitting is performed, when the slit film flat yarn is unwound from the bobbin winding bobbin, there is a problem in that it is twisted while being twisted. In addition, there is a problem of forming wrinkles or front and back flipping until weaving.

The present invention solves the problem that the slit film flat yarn is kept in a flat state and guided to the final coating mechanism, and the object of the invention is to provide an additional value that is developed by adding a high function and sufficiently exhibiting the characteristics of a flat cut flat yarn. The knitting method of the knitted fabric, the apparatus used in the knitting method, and the knitted fabric obtained thereby.

Further, according to the economic situation in recent years, the problem is also to reduce the manufacturing cost by reducing the number of manufacturing steps.

The slitting flat yarn knitting device according to the present invention is provided with a leg portion, a needle bed supported by the leg portion, a knitting portion disposed on the needle bed, a yarn feeding device that supplies the knitting yarn to the knitting portion, and the winding is knitted by the knitting A circular knitting machine for a winding portion of a knitted fabric, wherein the yarn feeding device includes a core yarn feeding device that supplies a core wire, and a slit film flat yarn feeding device that supplies a slit film, and the core wire is used. The coating mechanism for cutting the slit film is disposed between the slit film feeding device and the knitting portion, and the knitting device for cutting the flat yarn is provided with a guiding mechanism for guiding the slit flat yarn. The guiding mechanism causes the slit film flat yarn to be twisted from the slit film flat yarn feeding device to the coating mechanism without wrinkles and the front and back are not reversed.

Preferably, the slit film feeding device includes at least a first yarn feeding device on a side close to the knitting portion and a second yarn feeding device on a side away from the knitting portion, and the coating mechanism is provided in the foregoing The first yarn feeding device is interposed between the knitting portion.

Preferably, the covering mechanism has a cylindrical yarn inlet, a central portion having a diameter which is substantially half of the diameter of the yarn inlet, and a rectangular shape. The yarn exiting portion and the portion of the covering mechanism from the center portion to the yarn exit gradually change from a cylindrical shape to a rectangular shape.

Moreover, it is preferable that the circumference of the center portion is smoothly connected to the outer circumference of the rectangular shape of the yarn exit.

The short side (T) of the rectangular shape of the yarn exit is preferably 0.3 to 0.7 mm, and the long side (L) of the rectangular shape of the yarn exit is L = 1/2 × W + α (mm) (here, W It is preferably a width of the cut film flat yarn, α is 0 to 0.6 mm.

More preferably, the inner surface corner portion of the yarn exit is processed into an arc (R) shape.

Preferably, the guiding mechanism includes at least a first guiding mechanism disposed in the vicinity of the first yarn feeding device, a third guiding mechanism disposed directly in front of the coating mechanism, and the first guiding mechanism and the third guiding mechanism. The third guiding mechanism between the three.

More preferably, the guiding mechanism is a cylindrical pin.

The method for knitting a slit film of the present invention is a method of knitting using a circular knitting machine, the circular knitting machine comprising: a leg portion; a needle bed supported by the leg portion; and a braided portion disposed on the needle bed; a core yarn feeding device that supplies a core wire to the knitting portion; a slit film feeding device that supplies at least one of the slit film flat yarns; and a winding portion that winds the knitted fabric knitted by the knitting portion, wherein the cutting is performed The method for weaving a film flat yarn comprises the steps of: wrapping the core wire with the cut film flat yarn by using a coating mechanism between the slit film flat yarn feeding device and the knitting portion; and cutting the cut film flat yarn from the foregoing The film flat yarn feeding device is guided in such a manner that the covering mechanism does not twist, does not form wrinkles, and the front and back are not inverted. step.

Preferably, the slit film is formed into a mountain fold line, that is, an inverted V shape by the covering mechanism, and a core wire is wrapped therein.

The knitted fabric of the present invention is a knitted fabric knitted by the above-described apparatus or method, characterized in that the knitted fabric has a yarn in which the core thread is covered by the cut flat yarn.

According to the method and the device of the present invention, the flat cut film flat yarn developed by adding a high function is covered and woven in a state of being wrapped in a core wire, so that the yarn which exhibits the characteristics of each of the cut film flat yarn and the core wire can be obtained. Knitted fabric. Further, since the yarn is obtained by the knitting machine without the yarn making step, the manufacturing cost can be reduced. Further, in the state in which the yarn is wound into the bobbin in the yarn making step, the core yarn is wrapped in the cut film flat yarn, and the lack of stability causes the cut film flat yarn to easily fall off from the core wire, and in the manufacturing method of the present invention After the core wire is wrapped by the cut film flat yarn, the yarn is woven, so that the above-described disadvantages do not occur.

Hereinafter, embodiments of the invention will be described based on the drawings.

10‧‧‧First yarn feeding device

11‧‧‧First drive wheel

12‧‧‧First guidance agency

13‧‧‧First guiding hole

14‧‧‧Links

15‧‧‧Installation ring

16‧‧‧feeding wheel

20‧‧‧Second yarn feeding device

21‧‧‧Second drive wheel

23‧‧‧Links

24‧‧‧Installation ring

25‧‧‧Bob

40‧‧ needle bed

41‧‧‧ Gears

42‧‧‧ top gear

43‧‧‧dray yoke

44‧‧‧ drive shaft

45‧‧‧Top gear cover

46‧‧‧column (post)

47‧‧‧Connecting components

48‧‧‧Horizontal components

49‧‧‧ Gearbox

50‧‧‧Weaving Department

51‧‧‧needle dial hub

52‧‧‧Syringe needle

53‧‧‧Rock needle

[1]‧‧‧First yarn feeder

[2]‧‧‧Second yarn feeder

[3]‧‧‧third yarn feeder

[4]‧‧‧ Fourth yarn feeder

60‧‧‧ yarn guide

61‧‧‧Second guiding body

62‧‧‧Second guiding hole

63‧‧‧ Third guiding agency

64‧‧‧support plate

65‧‧‧left slope

66‧‧‧Decoup

70‧‧‧Winding Department

80‧‧‧covered institutions

81‧‧ ‧ yarn entrance

82‧‧‧ yarn export

83‧‧‧Central Department

84‧‧‧ inclined section

85‧‧‧The circumference of the central part

86‧‧‧ rectangular outer circumference

87‧‧‧ inner surface corner

CY‧‧ core

SY‧‧‧ cut film flat wire

Figure 1 is a front view of the entire circular knitting machine.

Fig. 2 is a front view showing a supply path of the knitting yarn in the present invention.

Fig. 3 is an enlarged view of a yarn guide comprising a support plate to which the covering mechanism of the present invention is attached.

4 is a schematic view showing a supply path of a knitting yarn of a braided portion in the present invention.

Fig. 5a is a perspective view of a covering mechanism in the present invention.

Figure 5b is a rear elevational view of the covering mechanism of the present invention.

Fig. 6 is a knitting structure diagram based on the knitting method in the present invention.

[Formation of the Invention]

1. Outline of circular knitting machine

Figure 1 is an overall view of a knitting machine, showing two first yarn feeding devices 10 and a second yarn feeding device 20, a first driving wheel 11 and a second driving wheel 21 for driving the yarn feeding device, and a plurality of The leg portion 30, the needle bed 40 supported by the leg portion 30, and the braided portion 50 disposed on the needle bed. The first yarn feeding device 10 and the second yarn feeding device 20 are driven from the first driving wheel 11 and the second driving wheel 21 via a driving belt, but the driving belt is not shown for convenience.

Although not shown, the braided portion 50 accommodates a plurality of syringe needles in a needle groove of a syringe that can slide in the vertical direction. A cam holder that is opposed to the syringe and has a control cam of the syringe needle is supported by the cam ring. As described in detail later, the knitting yarn is guided from the first yarn feeding device 10 and the second yarn feeding device 20 via the plurality of guiding mechanisms 12, 61, 63 and the guide holes 13, 62 from the yarn guiding mechanism provided with the covering mechanism 80. The device 60 is supplied to the syringe needle.

In the double-knit circular knitting machine, a dial hub 51 that rotates in synchronization with the syringe is provided above the cylinder. A dial having a needle groove in which a plurality of dial needles are slidable in the horizontal direction is attached to the dial hub 51. A gear device 41 for driving the syringe is disposed in the needle bed 40, and a top gear 42 for driving the dial hub 51 is rotatably supported on the pin tray creel 43 on the needle bed, the gear device 41 and the top gear 42 The drive shafts 44 are coupled in a synchronous manner. The top gear 42 is covered by the top gear housing 45 at the top gear A plurality of columns 46 are erected on the outer cover 45, and a horizontal member 48 is fixed to the upper portion thereof via a coupling member 47. A winding portion 70 that winds up the knitted fabric is provided below the needle bed 40.

2. Feeding device

The slit film has no stretchability for the yarn, so a yarn feeding device is usually used, and in the present embodiment, as shown in Fig. 1, two kinds of yarn feeding devices (first yarn feeding device 10 and second feeding device) are used. Yarn device 20). Driving the first yarn feeding device 10 is the first drive wheel 11. The drive wheel 11 is driven by a gear box 49 that drives the knitting machine, and is driven by a first yarn feeding device 10 (for example, MPF manufactured by Memminger-IRO Co., Ltd., Germany) via a driving belt (not shown). Driving the second yarn feeding device 20 is the second drive wheel 21. The second drive wheel 21 is driven by the above-described top gear 42 as a drive source, and is driven by a second yarn feeder 20 (for example, MER manufactured by Memminger-IRO Co., Ltd.) via a drive belt (not shown). The two yarn feeding devices 10, 20 are also fixed to the mounting rings 15, 24 by the connecting bars 14, 23 hanging from the horizontal member 48.

Further, the first yarn feeding device 10 and the second yarn feeding device 20 used are not limited to the above description, and can be appropriately changed depending on the material of the knitting yarn.

Although not shown, the core wire CY covered by the slit film SY is fed to the first yarn feeding device 10 via a bobbin tube such as a creel provided around the knitting machine.

3. Embodiment of yarn feeding device and method

A method of supplying a knitting yarn according to an embodiment of the present invention will be described.

First, the slit film SY is "rolled and fed" by the second yarn feeding device 20 from the bobbin 25 wound by the bobbin. (figure 2)

Then, the slit film SY sent from the second yarn feeding device 20 is wound in such a manner that the yarn winding yarns 16 of the first yarn feeding device 10 are not skewed, and the slit film SY does not overlap. And it is sent to the first guide hole 13 mounted on the mounting ring 15. (figure 2)

A first guiding mechanism 12 is mounted in front of the first guiding hole 13. The slit film SY sent from the first yarn feeding device 10 leads to the first guide hole 13 via the first guiding mechanism 12, and is directionally shifted in the downward direction in which the knitting portion 50 of the knitting machine is placed. (figure 2)

Further, the slit film SY is guided to the second guide hole 62 via the second guiding mechanism 61, and is directionally shifted in the downward direction in which the yarn guide 60 is placed. Further, the slit film SY is guided to the third guiding mechanism 63, and is directionalally changed toward the center direction of the yarn inlet 81 of the covering mechanism 80. (Figure 4)

The slit film SY is guided to the yarn inlet 81 of the covering mechanism 80 via the third guiding mechanism 63. (Figure 4)

Further, the core wire CY sent from the other first yarn feeding device (not shown) leads to the covering mechanism 80 through the other yarn guiding hole on the lower side of the slit film flat yarn along the central portion in the width direction of the slit film flat yarn SY. Yarn entrance 81. (Figure 4)

The slit film SY which is sent out from the yarn outlet 82 of the coating mechanism 80 is a mountain fold line (inverted V shape) by the covering mechanism 80, and the core wire CY is wrapped therein and supplied to the needle. (Figure 4)

It is preferable that the guide mechanisms 12, 61, and 63 have a cylindrical pin having a diameter of about 2.5 mm. The cylindrical pin can be as shown in FIG. The linear pin 63 may be gently curved as a whole. When the whole is bent, in the case of the pin 63 of Fig. 4, both ends of the pin are bent toward the covering mechanism 80 side, and the slit film SY is passed through the back of the curved center portion. Thereby, the cut film flat yarn SY is lifted up to the back of the curved center portion, and has the effect of splitting the wrinkles of the cut film flat yarn. The installation position and the number of installation of the guide mechanism can be appropriately changed depending on the type of the knitting machine.

Fig. 3 shows the yarn guide 60 of the covering mechanism 80 having the slit film SY covering the core wire CY in the present embodiment. The covering mechanism 80 including the yarn inlet 81 and the yarn outlet 82 is integrally provided below the support plate 64. The covering mechanism 80 and the support plate 64 may have an integral structure, or may be separately and independently manufactured and fixed integrally, and the fixing method may be any method such as bonding or welding. As long as the above object can be achieved, the covering mechanism 80 and the support plate 64 may be separately provided.

The right side portion 89 of the yarn exit 82 is the position at which the needle of the knitting needle is started to be closed.

Preferably, the left inclined portion 65 of the support plate 64 is extended to the limit in such a manner that the needle opened by the knitting needle does not close before the yarn is fed, to cover the opened tongue with the unwinding portion 66.

As shown in Fig. 3, the core wire CY and the slit film SY entering the yarn inlet 81 pass through the inside of the coating mechanism 80, and pass through the yarn outlet 82, and the core wire CY is wrapped in the slit film SY to reach the tongue. Closed weaving point.

5a and 5b show the covering mechanism 80 which covers the cut yarn SY in the present embodiment to the core CY. The covering mechanism 80 has a yarn inlet 81 on one side and a yarn outlet 82 on the other side. The inclination of the central portion 83 of the diameter from the cylindrical yarn inlet 81 to the substantially half of the diameter of the yarn inlet 81 The portion 84 changes in a tapered shape. The portion from the central portion 83 to the yarn exit hole 82 gradually changes from the cylindrical shape of the central portion 83 to the rectangular shape of the yarn exit hole 82. Preferably, the circumference 85 of the central portion 83 is smoothly connected to the rectangular outer circumference 86 of the yarn exit hole 82 in an equal manner.

The yarn exit 82 is a vertically long rectangular hole. Further preferably, the inner surface corner portion 87 of the yarn outlet is processed into a circular arc (R) shape.

The width (T) of the yarn exit hole 82 is preferably 0.3 to 0.7 mm, more preferably 0.5 mm. This width allows the slit film SY wrapped in the core wire CY to pass smoothly.

The length (L) of the yarn exit hole 82 is preferably changed depending on the width of the slit film SY to be used. For example, the length (L) of the yarn exit hole 82 is L = 1/2 × W + α with respect to the width (W) of the slit film, and it is preferable that α is in the range of 0 to 0.6 mm. Therefore, when the width (W) of the slit film flat yarn is 5 mm, the length (L) of the yarn exit hole 82 is preferably 2.5 to 3.1 mm, particularly preferably 2.6 mm.

The diameter of the central portion 83 is preferably 2.0 mm, and the diameter of the yarn inlet 81 is preferably 4.0 mm which is substantially twice the diameter of the central portion 83 such that the circumference 85 of the central portion 83 and the outer periphery 86 of the yarn exit hole 82 are provided. equal.

By limiting the size, the slit-cut flat yarn folded into approximately half is knitted into the knitting needle in a state of being folded in half without being deviated. Further, the width of the slit film SY used is preferably 3 to 7 mm.

4. Example of knitted fabric manufacturing

Under the following conditions, weaving was carried out using the apparatus according to the present invention.

<Use model> V-LEC6F19 inch syringe 6 machine number / dial 24 machine number Fukuhara Seiki Co., Ltd.

<Knitting Organization> One quarter machine number. Double-sided fabric

<Using Yarn> Syringe Plain: 5mm Width Cut Film Flat Product Name: MILIFE Type: TY Grade (Orthogonal Laminated Fabric) JX Nippon Mining Japanese Stone ANCI Co., Ltd. Core Polyester 56 dtex 36 filament Dial Plain: Cotton yarn 30 creases: nylon processing yarn 33 dtex 10 filament

Fig. 6 illustrates a knitting method of the above knitted structure. As shown in the figure, the knitting is performed by the aligned needle pins 52 and the rib pins 53. The first yarn feeding opening [1] supplies the slit film SY wrapped in the core wire CY, and is knitted by the cylinder needle 52. The cotton yarn MY is supplied to the second yarn feeder [2] and the third yarn feeder [3], and is knitted by the rib needle 53. The nylon processed yarn NY is supplied to the fourth yarn feeding opening [4], and is creased by all the cylinder needles 52 and the rib stitches 53 spaced apart by three.

In addition, the slitted flat yarn SY woven fabric that is wrapped into the core wire CY is not limited to a quarter number. Double sided fabric.

Further, the slit film SY wrapped in the core wire CY is not limited to the supply to the syringe needle, and may be supplied to the rib needle. If the slit film is made of a stretchable blank, it may be applied to the syringe needle and the rib needle. Supply.

As the knitted structure, it may be a plain weave, a tuck mesh structure, a mosaic structure, or the like, which is performed by a single-face knitting machine, and is knitted by double-faced knitting. The two-sided organization of the machine. Further, it is possible to realize a knitted fabric for electromagnetic wave shielding by using a metal yarn such as a copper wire as a core wire.

80‧‧‧covered institutions

81‧‧ ‧ yarn entrance

82‧‧‧ yarn export

83‧‧‧Central Department

84‧‧‧ inclined section

85‧‧‧The circumference of the central part

86‧‧‧ rectangular outer circumference

87‧‧‧ inner surface corner

CY‧‧ core

SY‧‧‧ cut film flat wire

Claims (13)

A knitting device for slitting a flat yarn, which is a device for supplying a core wire (CY) and a slit film flat yarn (SY) to a knitting machine, characterized in that the knitting portion (50) is positive A covering mechanism (80) is provided in the front, and the covering mechanism (80) encloses the core wire (CY) by the slit film flat yarn (SY). A knitting device for a slit film flat yarn according to the first aspect of the invention, wherein the covering mechanism (80) has a cylindrical yarn inlet (81) and a center having a diameter which is substantially half of a diameter of the yarn inlet (81). The portion (83) and the rectangular yarn outlet (82) are gradually changed from a cylindrical shape to a rectangular shape in a portion from the central portion (83) to the yarn outlet (82). A knitting device for a slit film flat yarn according to the second aspect of the invention, wherein the circumference (85) of the central portion (83) is smoothly connected in a manner equal to the outer circumference (86) of the yarn outlet (82). . A knitting device for a slit film flat yarn according to the second or third aspect of the invention, wherein the short side (T) of the rectangular shape of the yarn outlet (82) is 0.3 to 0.7 mm. The knitting device for a slit film flat yarn according to any one of claims 2 to 4, wherein the long side (L) of the rectangular shape of the yarn exit (82) is L = 1/2 × W + α ( Mm), where W is the width of the slit film, and α is 0 to 0.6 mm. A knitting device for a slit film flat yarn according to any one of claims 2 to 5, wherein The inner surface corner portion (87) of the yarn exit (82) is processed into an arc shape. A knitting device for slitting a flat yarn, the circular flat knitting device comprising a circular knitting machine, comprising: a leg portion (30); a needle bed (40) supported by the leg portion (30); a knitting portion (50) on the bed (40); a yarn feeding device for supplying the knitting yarn to the knitting portion (50); and a winding portion (70) for winding the knitted fabric knitted by the knitting portion (50), which is characterized The yarn feeding device includes a core yarn feeding device for supplying a core wire (CY) and a slit film flat yarn feeding device (10, 20) for supplying a slit film (SY), in the above-mentioned slit film flat yarn feeding device ( 20) A covering mechanism (80) is provided between the knitting portion (50), and the covering mechanism (80) encloses the core wire (CY) by the slit film flat yarn (SY), and is provided with a guiding mechanism (12, 61). 63), the guiding mechanism (12, 61, 63) guides the slit film flat yarn (SY), and causes the slit film flat yarn (SY) to reach the foregoing from the slit film flat yarn feeding device (20) The covering mechanism (80) does not twist before, does not form wrinkles, and the back of the watch does not flip. The woven fabric of the slit film flat yarn of the seventh aspect of the invention, wherein the slit film feeding device comprises at least a first yarn feeding device (10) adjacent to a side of the knitting portion (50) and away from the foregoing weaving The second yarn feeding device (20) on one side of the portion (50) is provided between the first yarn feeding device (10) and the knitting portion (50). A knitting device for a slit film flat yarn according to claim 7 or 8, wherein the guiding mechanism includes at least a first guiding mechanism (12) disposed near the first yarn feeding device (10) and disposed in the covering mechanism (80) The third guiding mechanism (63) directly in front, and the second guiding mechanism (61) disposed between the first guiding mechanism (12) and the third guiding mechanism (63). The knitting device for a slit film flat yarn according to any one of claims 7 to 9, wherein the guide mechanism is a cylindrical pin. A method for weaving a cut film flat yarn, which is woven by a circular knitting machine, comprising: a leg portion (30); a needle bed supported by the leg portion (30) (40); a braided portion (50) disposed on the needle bed (40); a core yarn feeding device that supplies a core wire to the braided portion; and a slitted flat yarn feeding yarn that supplies at least one of the slit film (SY) a device (10, 20); a winding portion (70) for winding a knitted fabric knitted by the weaving portion (50), the method for knitting the slit film flat yarn comprising: the slitting flat yarn feeding device (20) a step of encapsulating the core wire (CY) with the slit film (SY) by using a coating mechanism (80) with the covering portion (50); so that the slit film flat yarn (SY) is from the foregoing The step of guiding the slit film feeding device (20) to the covering mechanism (80) without twisting, forming wrinkles, and not turning the front and back. The method for knitting a slit film flat yarn according to claim 11, wherein the slit film (SY) is formed into a mountain fold line, that is, an inverted V shape, and the core wire is wrapped therein by the coating mechanism (80). The state of (CY). a knitted fabric by the eleventh aspect of the patent application or A knitted fabric knitted by the method of claim 12, wherein the knitted fabric has a yarn obtained by covering the core yarn (CY) with the cut film flat yarn (SY).