JPH10292234A - Bulky silk composite yarn and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulky silk composite yarn having good bulkiness and suitable fuzzes, holding a smooth yarn surface, simultaneously having good tension, stiffness and dry touch, and suitable as a raw yarn used in the field of high grade outer garments by using 100% silk, and to provide a method for producing the same. SOLUTION: This method for the bulky silk composite yarn comprises evacuating suction air from either of the inner surfaces of a substantially closed chamber, jetting cleaning air controlled so that the line flow of the jetted air substantially reaches a place near to the yarn inlet 2 of an air jet-processing device 1 at least fixed to the inside of the chamber to blow off accumulated wastes, simultaneously feeding a paralleled raw yarn comprising plural twisted silk yarns and plural twisted silk spun yarns in a natural dry state into the air-jetting processing device 1 to subject the fed plural silk yarns to a bulking processing treatment using the swirling flow of the jetted air charged from outside, delivering the bulky processed silk yarn outside the chamber through the yarn outlet of the air-jetting processing device 1, winding up the bulky process silk yarn and further additionally twisting the bulky process yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulky silk composite yarn which is mainly used in the field of high-grade outer garments and is particularly suitable for spring and summer, and a method for producing the same.

[Prior art]

Conventionally, as a method of bulking silk yarn, for example, a method of passing a wet raw yarn and another yarn (for example, polyester multifilament or woolen spun yarn) from a cocoon ball of a reeling bath together through a Taslan nozzle ( JP-A-60-
155708), a method of passing a raw thread through a thread scraping portion (for example, a knife edge) (Japanese Patent Application Laid-Open No. 2-47332), twisting and heat setting after refining the raw thread, and a solution similar to twisting in the opposite direction. A twisting method (Japanese Patent Application Laid-Open No. 4-228624) has been attempted. Further, as a raw yarn in a part of the outer garment field, a conventionally used spun cocoon or a silk spun yarn made from a sub-silkworm silk has been used as it is or by interweaving it with raw silk.

[0003]

However, among the conventional methods using raw silk as a raw yarn, the method of bulking with wet raw silk drawn from a cocoon ball in a reeling bath and other yarns is not suitable for bulking. Water droplets adhere to the processing nozzle and sericin and short fibers in raw silk mix with water droplets and gelatinize and harden, blocking the yarn path and hindering smooth yarn passage, causing numerous yarn breaks, making production difficult in practice It is. Also, the generation of steam from the spinning bath further degrades the conditions of the processing atmosphere. Further, the processed yarn does not have sufficient bulkiness. On the other hand, in the conventional method using silk spun yarn as it is, silk has no scale or crimp like wool and has few voids inside the yarn layer, so the woven fabric does not swell as thicker, and it is heavy, flat and hard. Becomes Further, the finished product had little fluff and a smooth yarn surface, so that the finished product had no swelling and had less roundness due to the use of flat cloth. The present invention solves the problems of the conventional method and uses a 100% silk material, but keeps the yarn surface smooth while having a bulky and moderate fluff, and stretches, waist and sharpen. It is an object of the present invention to obtain a bulky silk composite yarn suitable for use in the field of high-grade outer garments having a sense of touch, particularly for men and women's clothing for spring and summer, and a production method capable of efficiently producing the same.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, the inner layer portion of a plurality of twisted raw yarns having a substantially low bulk level is substantially removed. A core formed by twisting the outer layer portions of a plurality of highly twisted silk spun yarns and forming a part of a fluff and / or a loop of the silk spun yarn between twists of the raw yarn; The problem is solved by the bulky silk composite yarn having the surface portion exposed on the surface of the outer layer portion, wherein the remaining fluff and / or loop of the silk spun yarn is left. According to the second aspect of the present invention, suction air is discharged from any surface in the substantially closed chamber, and at least near the yarn inlet of the air jet processing apparatus fixed in the chamber. Injecting cleaning air adjusted to be able to blow off the debris that reaches and accumulates in the streamline, while twisting raw yarns and twisted silk spun yarns in a natural drying state Is supplied to the air jet processing device, and is processed to be bulky by a swirling flow of jet air introduced from the outside, and is sent out of the chamber through the yarn outlet of the air jet processing device and is wound up. This was solved by a method for producing a bulky silk composite yarn in which a bulky silk yarn was obtained, and then the bulky silk yarn was twisted.

According to a third aspect of the present invention, in the method for producing a bulky silk composite yarn according to the second aspect, the plurality of raw yarns have a ply twist factor of 10 to 70 and the plurality of spun silk yarns have a ply twist. It is preferable to use a method for producing a bulky silk composite yarn twisted with a twist coefficient of 30 to 100. According to a fourth aspect of the present invention, in the method for producing a bulky silk composite yarn according to the second or third aspect, the method for producing a bulky silk composite yarn having a twist twist coefficient in a range of 80 to 150 is provided. preferable. In the invention of claim 5, the feed rate of the raw yarn is set to an overfeed ratio of 5% or less with respect to the feed rate of the bulky silk yarn.
It is preferable to use the method for producing a bulky silk composite yarn according to any one of Items 4 to 4. According to the invention of claim 6, the streamline of the cleaning air is substantially conical with the apex of the cleaning air nozzle at the apex, and has an apex angle of 10 to 45 degrees. It is preferable to use the method for producing a bulky silk composite yarn described in Crab. According to the seventh aspect of the present invention, the raw yarn is supplied to the air injection processing device by separating the raw silk and the spun silk yarn into the yarn inlet of the air injection processing device and combining them at the yarn inlet. It is preferable to use the method for producing a bulky silk composite yarn according to any one of the above.

[0006] As a raw yarn used in the present invention, a spun silk yarn and a raw yarn are used in a state of being aligned. The silk spun yarn may be any ordinary silk spun yarn, and there are no limitations on the count of a plurality of twisted yarns, and the upper twisting coefficient is preferably 30 to 100. The raw yarn may be any ordinary raw yarn, and the denier is not limited to a plurality of twisted yarns, and the upper twisting coefficient is preferably 10 to 70. The twisting to be added to the bulky silk yarn obtained by the air jet processing device is not particularly limited and is selected according to the purpose of use, but usually the twisting coefficient is preferably 80 to 150. Silk spun yarn and raw yarn are placed in a natural dry state, not a wet state.
It is preferable to use the reference before and after. This is for smoothing the bulk processing by the air jet processing apparatus. As an air jet processing apparatus used in the present invention, for example,
Similar to those described in Japanese Patent Publication No. 4-8969 and Japanese Patent Publication No. 35-6684, any type based on the basic principle of performing bulky processing by adding a jet swirling flow of high-pressure air to a running yarn can be adopted. It is. The feed rate of the raw yarn is preferably preferably such that the overfeed ratio is usually 5% or less, particularly preferably 1.5 to 2.5, with respect to the feed speed of the bulky silk yarn. If the overfeed ratio is larger than this, an excessive loop will occur and the thickness will not be uniform,
The appearance is impaired and unstable, the yarn foot becomes short, and the productivity decreases. The streamline of the cleaning air may be in a range where the generated debris can be blown off.
Degree to 45 degrees is preferable, and particularly preferably 15 to 40 degrees.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an apparatus used for a method for producing a bulky silk composite yarn of the present invention will be described with reference to the drawings. In FIG. 1, a pair of chamber supply ports 21, 2
1. The air jet processing apparatus 1 is placed in a closed box-shaped chamber 16 except for a chamber outlet 22 and an inspection port (not shown).
Is fixed. The air jet processing apparatus 1 is, for example, as shown in FIG. That is, in the front view (a), the yarn inlet 2 is provided on one side (the right in this figure) by the pipe material 40 embedded in the rectangular body 5, and the other of the body 5 opposed to the yarn inlet 2. A yarn outlet 3 is provided at a side (left side in this figure) position, and a yarn inlet path 7 from the yarn inlet 2 and a yarn outlet path 8 from the yarn outlet 3 respectively extend concentrically into the body 5 and are engraved inside the body 5. The yarn exit path 8 and the yarn entrance path 7 are connected to each other across the ring-shaped air swirl groove 6 having a diameter larger than the cross section of the provided yarn entrance path 7 and the yarn exit path 8, respectively. A plurality of injection air inflow holes 41 are formed at positions crossing the swirl groove 6. (In the following description, the left side of the figure is the front, and the right side is the back). On the other hand, the injection air passage 9 extends vertically from the injection air inlet 4 formed in the lower surface of the body 5 and communicates with the lower end of the air swirl groove 6. Groove 6
Is slightly turned forward in front of the lower end. A blast air transport pipe 10 is connected to the blast air inlet 4 from the outside of the chamber 16 to a terminal to which a compressed air source such as a compressor is connected.

A cleaning air nozzle 11 is provided at a position below the yarn inlet 2 in the chamber 16, and a cleaning air transport pipe 12 connected to a compressed air source such as a compressor extends from the outside of the chamber 16 to a cleaning end. Air nozzle 11
Is communicated to. A cock (not shown) for adjusting the amount of air is interposed in the path of the cleaning air transport pipe 12. Suction air inlet 1 on the lower bottom of chamber 16
4 is connected to a suction air transport pipe 15 in which an air suction source such as a fan is connected to a terminal outside the chamber 16.

Above and outside the chamber 16, a winding tube 18 in which a plurality of twisted silk spun yarns A are wound in a cone shape
a and a peg 13, 1 on which a winding tube 18b obtained by winding a plurality of twisted raw yarns B into a cone shape is mounted on a gantry FF.
3, the spun silk yarn A and the raw silk B are drawn out from the winding tube 18a and the winding tube 18b, are aligned, and are sequentially aligned.
9, 19, cutter 29, 29, yarn drawing roller 2
0a, 20b, and thread / cut detection sensor / guide 24
Through the chambers a and 24a, the raw material 17 can be introduced into the chamber 16 from the chamber supply ports 21 and 21 formed in the upper surface of the chamber 16. Here, cutter 2
9 and 29 are thread cut detecting sensors 24a, 24a and 24
By detecting the yarn breakage at b, it is possible to operate electrically. The raw yarn 17 is bulk-processed by the air jet processing device 1 to be a bulk-processed silk yarn 25. The bulky processed silk thread 25 that has come out of the chamber 16 from the chamber discharge port 22 formed in the side surface of the chamber 16 is fed to the processed silk feed roller 2.
3. The cheese 27 can be wound by the rotation of a winding drum 26 that comes into contact with the surface via a thread cutting sensor / guide 24b and a traverse guide 28 that reciprocates left and right. For the chamber supply ports 21 and 21 and the chamber discharge port 22, it is preferable to use a surface-plated metal material or a ceramic coating material in order to maintain abrasion resistance with the raw yarn 17 and the bulky silk yarn 25 passing therethrough.

The apparatus used in the method for producing a bulky silk composite yarn of the present invention is not limited to the above-described apparatus. The pegs 13, 1, with the air jet processing device 1 and the chamber 16 as the middle part
The positional relationship between the three devices and the device around the winding drum 26 may be reversed. Although the chamber supply ports 21 and 21 supply the silk spun yarn A and the raw yarn B to the yarn inlet 2 of the air jet processing device in a separated state, they are combined.
This is a desirable alternative. Although the suction air inlet 14 may be provided on the side surface of the chamber 16, the suction efficiency is best when it is provided on the lower bottom surface as shown in FIG. A plurality of chambers 16 are adjacent to each other.
6 are fixedly connected or connected to each other, and the lower portions of the side surfaces of the adjacent chambers 16 are cut out to allow ventilation.
A plurality of chambers 16 may be provided with a common suction air inlet 14, but in this case, two chambers 16
It is desirable for the suction balance to be shared. In addition, a ring twisting machine, an up twister, or the like is usually used for the twisting added to the bulky silk yarn 25.

Next, an embodiment of the method for producing a bulky silk composite yarn of the present invention will be described with reference to FIGS. Yarn 1
The plurality of twisted silk spun yarns A and raw yarns B in the natural dry state wound around the winding tube 18a and the winding tube 18b which form the roll 7 are supplied and unraveled by driving the yarn drawing rollers 20a and 20b. The guides 19, 19, cutter 29,
29, a yarn 17 is introduced into the chamber 16 from the chamber supply ports 21 and 21 in the yarn supply direction X through the yarn take-out rollers 20a and 20b and the sensor / guide 24a After passing through the yarn inlet 2 of the body 5 of the body 5 of the air jet processing device 1, the yarn inlet path 7, the air swirl groove 6, the yarn outlet path 8, and the yarn outlet 3, the path is bulky and the course immediately after leaving the yarn outlet 3 is changed. The processing silk thread delivery roller 2 which is bent at a substantially right angle and is outside the chamber 16
By the drive of 3, the inside of the chamber 16 is advanced. However, since the supply surface speed of the raw yarn take-out roller 20b is slightly higher than the supply surface speed of the processed silk supply roller 23, the yarn is relaxed and the gap is reduced. Increase the fluff and / or cause loops, but the silk spun yarn A
Is more susceptible to the air pressure injected from the raw yarn B, and the shape change is large and rich, so that a plurality of spun silk yarns twisted between open twists of a plurality of twisted raw yarns B A
And / or a bulky silk thread 25 sandwiching a part of the loop. It is generally preferable that the yarn drawing rollers 20a and 20b have the same surface speed, thereby acting to stably supply the supply yarn 17. Normally, a pair of chamber supply ports 21 and 21 are provided, and the silk spun yarn A
And the raw silk B are introduced into the chamber 16 in a separated state, and are combined after reaching the yarn inlet 2 of the air jet processing apparatus 1.
And the raw silk B are prevented from being randomly twisted, and the unevenness of the bulky processing is eliminated. When the thread / cut detection sensor / guide 24a, 24a detects a cut or an abnormality of the spun silk yarn A and / or the raw silk B, the cutters 29, 29 are simultaneously operated to cut the spun silk yarn A and the raw silk B, and cut one piece. In this state, the supply of the original yarn 17 is prevented.

After the bulky processed silk thread 25 advances in the chamber 16, the processed silk thread delivery roller 23 is driven to move out of the chamber 16 through the chamber outlet 22 by driving the processed silk thread delivery roller 23, and the processed silk thread delivery roller 23 is moved in the processing silk delivery direction Y. Then, the cheese 27 is wound around the cheese 27 by the rotation of the winding drum 26 via a thread cutting detection sensor / guide 24b and a traverse guide 28. The cheese 27 is set on an ordinary method, for example, a ring twisting machine, an up twister or the like, and subjected to additional twisting to obtain a bulky silk composite silk thread. In the bulk processing with the air jet processing apparatus 1, the jet air transport pipe 10 connected to the terminal from the outside of the chamber 16 with the compressed air source is connected to the jet air inlet 4 on the lower surface of the body 5, and is introduced in the jet air transport direction Q. The compressed air reaches the lower end of the air swirl groove 6 from the injection air inlet 4 through the injection air passage 9, and flows as a swirling flow directed forward to the yarn 17 introduced from the yarn inlet 2 into the yarn inlet passage 7. Immediately after leaving the body 5 together with the air flow from the yarn outlet 3 through the air swirl groove 6 and the yarn outlet path 8 through the yarn outlet path 8, the course is bent at almost a right angle and over-fed to form a bulky silk thread 25. Sensor / guide 24b for thread cut detection
Detects that the bulky silk thread 25 is cut or abnormal, the cutters 29 and 29 operate simultaneously, and the spun silk yarn A and the raw silk B
Is cut off to prevent the supply of the raw yarn 17.

On the other hand, a cleaning air nozzle 11 provided at a position below the yarn inlet 2 is connected to a cleaning air transport pipe 12 connected to a terminal of a compressed air from the outside of the chamber 16 to the outside. During operation of the air jetting apparatus 1, streamlines are adjusted so as to be substantially reachable at least in the vicinity of the yarn inlet 2 and are jetted as cleaning air in the transport direction P. In FIG. 3, the adjustment of the cleaning air is performed by selecting and combining the pressure and / or flow rate of the compressed air, the distance d from the yarn inlet 2 to the tip of the cleaning air nozzle 11, the shape of the cleaning air nozzle 11, and the like. However, as a measure of adjustment, a streamline of substantially conical cleaning air having the cleaning air nozzle 11 at the apex reaches the vicinity of the yarn inlet 2, and at least during the operation of the air jetting device 1, the streamline is at least at the yarn inlet 2. It is necessary to blow off short fibers, fly wool such as flying cotton, and debris such as sericin which are likely to stagnate and accumulate with the passage of time, and drop them below the chamber 16. If the generated dust is not blown off, the stickiness of the generated dust easily causes stagnation and accumulation in the vicinity of the yarn inlet 2 in a short time, making it impossible to continue the operation.

At the same time, a suction air transport pipe 15, which is connected to an air suction source at a terminal outside the chamber 16, communicates with the suction air inlet 14 on the lower bottom surface of the chamber 16. Suction air is taken in together with the suction air together with the suction air by sucking the air in the suction air 16 and the debris actively blown off by the cleaning air nozzle 11, as well as the fly waste generated during the passage of the original yarn 17 and the bulky silk yarn 25. It is moved out of the chamber 16 in the suction air transport direction R, taken out of the chamber 16, and stored in a dust collector provided with a filter, such as a bag filter, connected to the air suction source of the terminal. Chamber 16
The internal air balance is determined by the input “injection air from the injection air inlet 4 + the cleaning air from the cleaning air nozzle 11”, the output “the suction air from the suction air intake 14”, and the “yarn inlets 21, 21”. And leakage from the yarn outlet 22 "
Usually, the suction air is slightly increased to prevent the dirty air in the chamber 16 from leaking directly to the outside.

Next, an embodiment of the bulky silk composite yarn of the present invention will be described with reference to FIG. FIG. 4A is a schematic front view of the supply yarn, and FIG. 4D is a schematic sectional view of FIG.
A silk spun yarn A comprising a plurality of twisted unit silk spun yarns a ₁ and a ₂ , and a plurality of twisted unit silk spun yarns b ₁ and b ₂ ,
This shows a state before the bulky processing of the raw yarn 17 in which the raw yarn B made of b ₃ is aligned into the air jet processing device 1, and the spun silk yarn A and the raw yarn B have little voids and bulk, and the silk spun yarn The fluff on the surface of A is short and small. FIG. 4B is a schematic front view of the bulky silk thread 25, and FIG. 4E is a schematic sectional view of FIG. This shows a state after the raw yarn 17 has been subjected to bulk processing by the air jet processing device 1. In bulk processing, the spun silk yarn A is more susceptible to the air pressure injected from the raw yarn B and has a large change in shape. Or because there are many loops and rich in bulkiness,
A part of the fluff and / or a loop of the spun silk yarn A is sandwiched between the open twists of the raw yarn B composed of a plurality of unit raw yarns b ₁ , b ₂ , and b ₃ , and the air jet processing device 1 directly outputs the same. After leaving, the twist of the raw silk returns to its original state, and the spun silk spun yarn A and / or
Or, the loop ends are twisted, and the remaining fluff and / or loop of the silk spun yarn A is longer and bulkier on the surface than the raw yarn 17,
The bulky processed silk yarn 25 in which the separation of the spun silk yarn A and the raw silk B is slightly suppressed is obtained. FIG. 4C is a schematic front view of the bulky silk composite yarn 30, and FIG. 4F is a schematic sectional view of FIG. This shows a state after the bulky silk yarn 25 has been twisted by a conventional method, and is formed by twisting the inner layer portion of the raw silk B having a substantially lower bulkiness level with the outer layer portion of the silk spun yarn A having a higher bulkiness level. The core, a part of the silk spun yarn A sandwiched between the open twists of the unit raw silks b ₁ , b ₂ , and b ₃ of the raw silk B, and / or a loop, expressed on the surface part A bulky silk composite yarn 30 having a certain remaining fluff and / or loop is obtained. In the bulky silk composite yarn 30 to which the twist is added, the fluff and / or the loop are slightly shorter than the bulky silk yarn 25.

[0016]

【Example】

[Example 1] A silk spun yarn A in which two spun silk yarns of count EC140 were twisted in a twisting S direction of 760 T / m, and a raw yarn in which four raw yarns in 21 were twisted in a twisting S direction of 150 T / m. B and the air jet processing device 1 described above as the raw yarn 17 by using the above-mentioned air jet processing device 1, and the surface speed of the bulky silk spinning delivery roller is 150 m /
The bulky silk thread 25 was obtained under the conditions of a pressure of 4.0 kg / cm ^{3 of} the blast air and an overfeed ratio of 1.7%. The obtained bulky silk yarn 25 was twisted at 800 T / m in the S direction to obtain a bulky silk composite yarn 30 of the present invention having a count of M / C57 of Example 1. At this time, the chamber 16 is 11000 cm.
Those ³ of the box-shaped provided two adjacent, and installing the air blasting apparatus 1 of one by one each, from the thread inlet 2 d = 6
The compressed air having a vertex angle θ of 25 ° and a pressure of 2 kg / cm ³ is supplied from the cleaning air nozzle 11 facing upward at a position of about cm, and the streamline of the substantially conical cleaning air reaches the vicinity of the yarn inlet. As described above, the lower part of the side of the adjacent chamber 16 is cut out to allow ventilation, a common suction air inlet is provided, and air is constantly suctioned at a rate of 2 m ³ / min per air jet processing apparatus. And waste such as sericin was discharged out of the chamber 16.

Example 2 Silk spun yarn 2 of count EC140
A silk spun yarn A obtained by twisting a book in a twisting S direction of 760 T / m;
The raw yarn B obtained by twisting three raw yarns 21 in the twisting direction 200 T / m is used as the original yarn 17 and the surface speed of the bulky silk spinning delivery roller 150 m / The bulky silk thread 25 was obtained under the same conditions as in Example 1 except that the pressure of the jet air was 3.5 kg / cm ³ , and the overfeed ratio was 1.7%. The resulting bulky silk thread 25
Is twisted at 800 T / m in the S direction, and the number M of Example 2 is increased.
/ C64 bulky silk composite yarn 30 of the present invention was obtained.

In order to evaluate the performance of the bulky silk spinning, a 100% silk spun yarn woven fabric and a raw silk silk spun yarn interwoven woven fabric and the bulky silk composite yarn woven fabric of Example 1 were plain woven under the conditions shown in Table 1, respectively. Then, each fabric was scored by 10 people on a scale of 10 out of 10 for each item, and averaged to obtain a total score of Table 2.

[0019]

[Table 1]

[0020]

[Table 2]

From Table 2, it can be seen that the bulky silk composite yarn woven fabric of Example 1 has a higher overall score than the other woven fabrics compared.
It shows that it is suitable for the high-grade outer garment field, especially for the spring and summer men's and women's clothing fields.

[0022]

The bulky silk composite yarn of the present invention has a core portion in which raw silk substantially forms an inner layer portion and a spun silk yarn forms an outer layer portion;
Since it has a surface portion on which fluff and / or loops are expressed, despite using a material of 100% silk, the yarn surface keeps smoothness while having a bulky and moderate fuzz,
It is suitable as a yarn used in the field of high-grade outer garments having a tightness, a waist and a crisp feeling. Further, according to the production method of the present invention, the bulky silk composite yarn of the present invention can be efficiently produced.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an example of an apparatus used for a method for producing a bulky silk composite yarn of the present invention.

2 (a) is a side view, FIG. 2 (b) is a front view, and FIG. 2 (c) is a rear view showing an example of an air jet processing apparatus used in the apparatus shown in FIG.
(D) It is the schematic diagram of some pipe materials.

FIG. 3 is a schematic explanatory view showing a positional relationship of an example of a cleaning air nozzle used in the apparatus of FIG.

FIG. 4 is a schematic front view of (a) a supply raw yarn, (b), a schematic front view of a bulky processed silk yarn, for a bulky silk composite yarn of the present invention,
(C) A schematic front view of a bulky silk composite yarn, (d) a schematic sectional view of (a), (e) a schematic sectional view of (b), and (f) a schematic sectional view of (c).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Air injection processing apparatus 2 Thread inlet 3 Thread outlet 4 Injection air inlet 5 Body 6 Air swirl groove 7 Thread inlet path 8 Thread outlet path 9 Injection air path 10 Injection air transport pipe 11 Cleaning air nozzle 12 Cleaning air transport pipe 13 Peg 14 Suction air inlet 15 Suction air transport pipe 16 Chamber 17 Yarn 18 a, 18 b Winding pipe 19 Guide 20 a, 20 b Yarn pull-out roller 21 Chamber supply port 22 Chamber outlet 23 Bulk processing silk yarn feeding roller 24 a, 24 b Sensor 25 bulked silk 26 winding drum 27 cheese 28 traverse guide 29 cutter 30 bulky silk composite yarn 40 pipe 41 ejecting air inflow stoma d distance A silk yarn a _1, a ₂ unit silk yarn B silk b _1, b ₂ , b ₃ unit raw silk P Pneumatic transport direction for cleaning Q Pneumatic transport direction R Suction air transport direction X Raw yarn supply direction Y Processing silk yarn discharge direction θ Apex angle

Claims (7)

[Claims] The raw silk is formed by twisting an inner layer portion of a plurality of twisted raw yarns having a substantially low bulk level by an outer layer portion of a plurality of twisted silk spun yarns having a substantially high bulk level. And a core formed by sandwiching a part of the fluff and / or loop of the silk spun yarn between the twists, and the remaining fluff and / or loop of the silk spun yarn are expressed on the surface of the outer layer portion. Bulky silk composite yarn, characterized by having 2. Suction air is discharged from any surface in a substantially closed chamber, and a streamline substantially reaches at least near a yarn inlet of an air jet processing device fixed in the chamber. An original in which a plurality of twisted raw yarns and a plurality of twisted silk spun yarns in a naturally dried state are aligned while jetting cleaning air adjusted to blow off accumulated debris. The yarn is supplied to the air-jet processing device and bulk-processed by a swirling flow of blast air introduced from the outside. The yarn exits the yarn outlet of the air-jet processing device and is sent out of the chamber to be wound and is a bulky silk yarn. And then subjecting the bulky silk thread to twist-twisting. 3. The method for producing a bulky silk composite yarn according to claim 2, wherein the plurality of raw yarns have a ply twist coefficient of 10 to 70 and the plurality of spun silk yarns have a ply twist coefficient of 30 to 100. A method for producing a bulky silk composite yarn, which is twisted. 4. The method for producing a bulky silk composite yarn according to claim 2, wherein the twisting coefficient is in the range of 80 to 150. 5. The production of a bulky silk composite yarn according to claim 2, wherein the feed rate of the raw yarn is set to an overfeed ratio of 5% or less with respect to the delivery speed of the bulky silk thread. Method. 6. The cleaning air stream according to claim 2, wherein the stream of the cleaning air has a substantially conical shape with the apex of the cleaning air nozzle as an apex and an apex angle of 10 to 45 degrees. A method for producing a bulky silk composite yarn according to the present invention. 7. The raw yarn is supplied to the air jet processing device by separating the raw silk and the spun silk yarn up to the yarn inlet of the air jet processing device and joining them at the yarn inlet. The method for producing a bulky silk composite yarn according to any one of the above.