JP2004044061A - Process for producing spun yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a spun yarn capable of easily removing polymeric contaminating string- or film-shaped materials contaminated in the raw material of a natural fiber such as cotton, silk or the like in its spinning process. <P>SOLUTION: This method for producing the spun yarn by using the natural fiber such as cotton, silk or the like containing the string- or film-shaped polymeric contaminating materials, as the raw material is provided by performing a heat treatment on the natural fiber containing the polymeric contaminant at or higher temperature than the softening point of the polymeric contaminant and lower than the thermal decomposition point of the natural fiber to make the string- or film-shaped polymeric contaminants as lumpy materials in any of the production processes of the spun yarn and then removing the lumpy materials in the production processes of the spun yarn. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a spun yarn, and more particularly, to a method for producing a spun yarn using a natural fiber such as cotton or silk containing a string-like or film-like polymer impurity as a raw material.
[0002]
[Prior art]
When a spun yarn is manufactured using natural fibers such as cotton, silk, wool, and hemp (hereinafter sometimes simply referred to as natural fibers) as raw materials, the raw materials pass through a spinning process shown in FIG.
After washing and removing foreign substances mixed in the natural fiber of the raw material in the washing step, a thick string-like fibrous body (sliver) obtained by aligning the single fibers in the refining and carding step is combed. In the combing process, the short fibers are removed while combing the single fibers by combing with a comb. Next, the plurality of slivers that have passed through the combing process are stretched together, and the sliver that has passed through the drawing process, which averages the unevenness in thickness, is further stretched in the roving process while slightly twisting to add a thick thread-like coarse. Thread. Further, the roving yarn is twisted while being stretched in the spinning step to obtain a spun yarn having a desired thickness, and the obtained spun yarn is wound around a bobbin or the like.
Thereafter, when the spun yarn wound on the bobbin or the like is supplied to the weaving knitting machine, the yarn is formed into a winding suitable for the weaving knitting machine that supplies the spun yarn in the finishing hoisting step.
[0003]
[Problems to be solved by the invention]
According to the spinning process shown in FIG. 8, impurities derived from natural fibers such as husks and pupae of silkworms, which are contaminated in raw materials of natural fibers such as cotton and silk, are mainly subjected to a washing process, a de-filing / carding process. Since it can be removed in the cotton step and the combing step, it can be prevented from being mixed into the spun yarn.
However, in recent years, strings and films made of a polymer resin such as polypropylene and polyethylene are used for packing natural fibers such as cotton and silk, and the like. Often mixed in.
Among such high-molecular impurities, lump-like impurities can be removed by a washing step, a defibrating / carding step and a combing step, but string-like or film-like high-molecular impurities are defibrated / carded. When the single fibers are aligned in the process or combed in the combing process, the fibers are torn in the direction in which the single fibers are aligned or combed with the comb to form a fibrous body, which is mixed into the spun yarn. Sometimes.
As described above, the fibrous body composed of the polymer resin mixed into the spun yarn is usually difficult to be dyed by the dye used for the natural fiber. For this reason, when a yarn or a woven or knitted fabric, which is a final product obtained by using a spun yarn mixed with a fibrous body made of a polymer resin, is dyed with a dye for natural fibers, the dyed yarn or the woven fabric is dyed. In the knitted fabric, a stained spot appears in which a fibrous body made of a polymer resin that is not substantially dyed appears in a streak shape. A yarn or a woven or knitted material having such stained spots is treated as a defective product.
[0004]
BACKGROUND ART Conventionally, removal of string-like or film-like polymer contaminants contaminated in natural fiber raw materials is performed by visual inspection by a human in a washing process of the natural fiber raw materials. For this reason, although high-molecular impurities present on the surface of the raw material can be removed, high-molecular impurities existing inside the raw material cannot be removed, and string-like or film-like high-molecular impurities mixed in the raw material of the natural fiber can be removed. Things cannot be removed sufficiently. As a result, dyeing spots are likely to be caused on the yarn or woven or knitted fabric which is the final product.
Therefore, an object of the present invention is to provide a method for producing a spun yarn capable of easily removing a string-like or film-like polymer contaminant contaminated in a raw material of natural fibers such as cotton and silk in the spinning process. It is in.
[0005]
[Means for Solving the Problems]
As a result of repeated studies to solve the above problems, the present inventor found that string-like or film-like polymer impurities contaminated in raw materials of natural fibers such as cotton and silk are natural fibers such as cotton and silk. When softening is started at a temperature lower than the thermal decomposition temperature of a natural fiber impregnated with string-like or film-like polymer impurities, heat treatment is performed at a temperature at which the polymer impurities soften. The present inventors have found that molecular contaminants are lumps that can be easily removed by a comb in a combing process while involving natural fibers, and the present invention has been achieved.
That is, the present invention provides a method for producing a spun yarn using a natural fiber such as cotton or silk containing a string-like or film-like high molecular impurity as a raw material, the method comprising the steps of: In the step of, the natural fibers containing the polymer impurities, subjected to a heat treatment at a temperature equal to or higher than the softening temperature of the polymer impurities and lower than the thermal decomposition temperature of the natural fibers, the string-like or film-like The method for producing a spun yarn is characterized in that after the polymer impurities are formed into a lump, the lump is removed in a process of producing the spun yarn.
[0006]
In the present invention, by performing the heat treatment on the natural fiber containing the polymer contaminant as the wet heat treatment, the entire natural fiber containing the polymer contaminant can be uniformly heat-treated.
By performing this heat treatment up to the combing step, a lump or film-like lump of polymer impurities can be easily removed with a comb.
As such a heat treatment, the inside of the container filled with the natural fibers containing the polymer impurities is subjected to steam heat treatment for maintaining the pressure at a predetermined pressure by the steam, so that the entire natural fibers containing the polymer impurities are more evenly distributed. Heat treatment can be performed.
The heat treatment temperature is preferably set to 150 to 170 ° C. when the polymer impurity is a string-like or film-like polymer impurity made of polyethylene or polypropylene and the natural fiber is silk.
[0007]
According to the present invention, in any step of the production process of the spun yarn, a heat treatment is performed at a temperature equal to or higher than the softening temperature of the high molecular impurities and lower than the thermal decomposition temperature of the natural fiber, thereby forming a string or a film. The molecular contaminants are formed into lumps.
Such a lump is remarkably thicker, harder and more brittle than the single fiber constituting the natural fiber, and thus can be removed in the process of producing a spun yarn.
For example, if there is a lump of string-like or film-like high-molecular contaminants in the raw material, it is crushed and dropped by a batting machine used in the washing process of the raw material or in the fiberizing / carding process. And can be removed as a nep by a comb or the like in a combing process.
In addition, since the lump is hard and brittle, it is crushed and shortened by winding or the like, and in the roving or spinning process, when the roving is stretched, the lump which has been crushed and shortened together with the cotton wadding Fall.
Furthermore, even if a lump is mixed in the spun yarn that has passed through the spinning process, it is suitable for a weaving machine that supplies a spun yarn when supplying the spun yarn wound around a bobbin to the weaving machine. In the finishing winding process in which the yarn is wound, it is easily found by a sensor that senses a defect of the spun yarn, and the portion can be cut and removed.
As a result, string-like or film-like polymer contaminants existing in the massive natural fibers that have been overlooked by conventional visual inspection can be removed, and the quality of the obtained spun yarn can be improved.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The raw material of the spun yarn targeted in the present invention is a natural fiber such as cotton, silk, wool, and hemp, and silk can be suitably used.
The string-like or film-like polymer impurities contained in such natural fibers are used for packaging natural fibers and the like, and cannot be completely removed by the conventional spinning process, and remain in the spun yarn. , Causing staining spots. Particularly, as the string-like or film-like polymer impurities, there are many string-like or film-like polymer impurities made of polyethylene or polypropylene.
In the present invention, any of the production steps of the spun yarn, preferably by the combing step, with respect to the natural fiber containing the string-like or film-like polymer impurities, at a temperature not lower than the softening temperature of the polymer impurities. It is important that the heat treatment is performed at a temperature lower than the thermal decomposition temperature of the natural fiber.
Here, the heat treatment temperature is preferably measured in advance by sampling the thermal decomposition temperature of the natural fiber in the raw material to be used and the softening temperature of the string-like or film-like polymer impurity mixed therein.
The heat treatment temperature determined in this way may be higher than the degradation temperature of the natural fiber, even if it is lower than the decomposition temperature of the natural fiber. It is preferable to adjust so that the heat treatment time does not occur.
For example, when silk is used as a natural fiber, and when string-like or film-like high-molecular impurities made of polyethylene or polypropylene are contained, the heat treatment temperature is set to 150 to 170 ° C, and the heat or wet heat is applied. Heat treatment can be performed below.
The heat treatment time at such a heat treatment temperature is 10 minutes or less, preferably 5 minutes or less, more preferably 1 minute or less, particularly preferably 30 seconds or less in wet heat treatment. Even in the dry heat treatment, the heat treatment time is preferably set to 5 minutes or less.
In the case of wet heat treatment, the steam heat treatment apparatus shown in FIGS. 1 and 2 can be suitably used.
[0009]
In the steam heat treatment apparatus shown in FIG. 1, the cylinder 12 is accommodated in the pressure vessel 10 in which the steam supply pipe 18 provided with the control valve 20 in the middle is mounted. The cylindrical body 12 is provided with a net 14 on the bottom side thereof, and contains a string-like or film-like polymer impurity (hereinafter, may be simply referred to as a polymer impurity) on the net 14. Natural fibers 16 are stored. A discharge pipe 22 provided with a control valve 24 outside the pressure vessel 10 is attached to the bottom of the cylinder 12.
In the steam heat treatment apparatus shown in FIG. 1, the control valve 20 provided on the steam supply pipe 18 is a control valve for controlling an opening degree so that a certain amount of steam is supplied into the pressure vessel 10 during the heat treatment. The control valve 24 mounted on the discharge pipe 22 is a pressure control valve that holds the steam pressure in the pressure vessel 10 at a predetermined value. Therefore, when the heat treatment is started, the steam supplied from the steam supply pipe 18 to the pressure vessel 10 is subjected to the heat treatment while flowing down the natural fibers 16 stored in the cylindrical body 12, and a part thereof is discharged together with the drain. Discharged via 22. Therefore, the natural fibers 16 stored in the cylindrical body 12 can be heat-treated uniformly in a short time.
On the other hand, when the heat treatment is completed after a predetermined time has elapsed from the start of the heat treatment, the control valve 20 is closed and the control valve 24 is opened to release the water vapor pressure in the pressure vessel 10. The lid of the pressure vessel 10 is opened to take out the heat-treated natural fibers 16.
The drain that accumulates at the bottom of the pressure vessel 10 during the heat treatment is discharged out of the pressure vessel 10 by drain discharge means (not shown) such as a drain trap provided at the bottom of the pressure vessel 10.
[0010]
According to the steam heat treatment apparatus shown in FIG. 1, since steam flows down in the natural fibers 16 stored in the cylindrical body 12 to perform heat treatment, the polymer impurities can be removed even at a low temperature near the softening temperature of the polymer impurities. It can be sufficiently softened.
However, in the steam heat treatment apparatus shown in FIG. 1, since a part of the steam is discharged from the pressure vessel 10 during the heat treatment, there is a loss in thermal energy.
For this reason, when the natural fibers 16 are not substantially deteriorated even when the heat treatment is performed at a temperature higher than the softening temperature of the polymer impurities, as in the steam heat treatment apparatus shown in FIG. The natural fiber can be subjected to a heat treatment without discharging a part of the steam from the pressure vessel.
The steam heat treatment apparatus shown in FIG. 2 has a cylindrical body 32 in which natural fibers 16 containing polymer impurities are stored in a pressure vessel 10 equipped with a steam supply pipe 34 provided with a control valve 36 in the middle. Is housed. At the bottom of the pressure vessel 10, a discharge pipe 38 provided with a control valve 40 on the way is mounted.
In the steam heat treatment apparatus shown in FIG. 2, when the heat treatment is started, the control valve 36 is opened, and steam adjusted to a predetermined pressure is supplied into the pressure vessel 10 via the steam supply pipe 34, and the discharge pipe 38 Since the control valve 40 is closed, the inside of the pressure vessel 10 reaches a predetermined pressure by the steam pressure and is maintained at a predetermined temperature. Therefore, the natural fibers 16 stored in the cylindrical body 32 are also heated to a predetermined temperature.
On the other hand, when the heat treatment is completed after a predetermined time has elapsed from the start of the heat treatment, the control valve 36 is closed and the control valve 40 is opened to release the water vapor in the pressure vessel 10 together with the drain. The lid of the pressure vessel 10 is opened to take out the heat-treated natural fibers 16.
[0011]
Although the steam heat treatment shown in FIGS. 1 and 2 requires the pressure vessel 10, a dry heat treatment that does not require the pressure vessel 10 can be employed for the heat treatment of the present invention. FIG. 3 shows an example of the dry heat treatment apparatus.
In the dry heat treatment apparatus shown in FIG. 3, natural fibers 16 containing high-molecular impurities are spread in a mat shape on a belt conveyor 50 stretched between a driving wheel 52 and a driven wheel 54, and are heated by an electric heater or the like. The air is passed below a hot air generator that generates hot air of a predetermined temperature and is heated to a predetermined temperature by the hot air.
In such a dry heat treatment apparatus, the time for blowing the hot air from the hot air generator onto the natural fibers 16 is adjusted by adjusting the speed of the belt conveyor 50 and the like so that the natural fibers 16 can be uniformly heated to a predetermined temperature. Therefore, the dry heat treatment apparatus shown in FIG. 3 has a slow heat treatment rate and is likely to be large in size, as compared with the steam heat treatment apparatuses shown in FIGS.
[0012]
The polymer contaminants contained in the natural fibers, which have been heated to the softening temperature or higher by the heat treatment apparatus shown in FIGS. 1 to 3, become lumps while involving the natural fibers. Such a lump is remarkably thicker, harder and more brittle than the monofilament constituting the natural fiber, and thus can be sufficiently removed in the spinning process.
In the spinning process, the raw material of the natural fiber passes through a fiber refining process in which a fiber opening machine shown in FIG. 4 and a cotton batter shown in FIG. 5 are used. In the fiber opening machine shown in FIG. 4, the natural fibers 16 are beaten by the rotating rollers 60, 62 and the beater 64 to loosen a lump of the natural fibers 16 as the raw material and open the fiber. The opened natural fibers 16 are beaten by a beater 66 of a cotton batter shown in FIG. 5, and then sucked to the front surfaces of a pair of cage rollers 70, 70 to be formed into a mat shape.
When the natural fiber 16 heat-treated by the heat treatment apparatus shown in FIGS. 1 to 3 is supplied to the fiber opening machine shown in FIG. 4 or the cotton batter shown in FIG. 5, the string or film contained in the natural fiber 16 is obtained. The lump formed by heat-treating the high-molecular contaminants is crushed by beaters 64 and 66, rollers 60 and 62, and the like.
The lump which has been crushed and shortened (smaller) by the beater 64 or the like falls from the lattice 65 of the opening machine, the lattice 68 of the cotton batter and the cage rollers 70, 70, and is separated from the natural fibers 16.
[0013]
The mat-like natural fibers 16 that have passed through the opening machine shown in FIG. 4 or the cotton batter shown in FIG. 5 are used to make single fibers in a card shown in FIG. (Sliver). In the card shown in FIG. 6, the supplied mat-shaped natural fibers 16 are divided into a plurality of “く” shaped needles provided on the surface of the cylinder 72 and a plurality of “く” shaped needles provided on the flat 74. The fibers are combed with a needle in the shape of a letter, and the single fibers constituting the natural fibers 16 are aligned to form a sliver.
When the natural fiber 16 heat-treated by the heat treatment apparatus shown in FIGS. 1 to 3 is supplied to the card shown in FIG. 6, the string-like or film-like polymer impurities contained in the natural fiber 16 are heat-treated. Since the formed mass is significantly thicker than the single fiber constituting the natural fiber, it is scraped to the needle side when combing with the plurality of needles of the cylinder 72 and the plurality of needles of the flat 74. Removed.
[0014]
The sliver 76 that has passed through the card shown in FIG. 6 passes through the comber shown in FIG. 7 in the combing step. FIG. 7 is a principle diagram of the comber. As shown in FIG. 7A, a sliver 76 is inserted between push members 78a, 78a provided at predetermined intervals and push members 78b, 78b. After that, the lower comb 80 is moved in the direction of the pressing members 78b, 78b while one end of the sliver 76 is held by the pressing members 78a, 78a, and the sliver 76 is combed.
Next, as shown in FIG. 7B, the sliver 76 having a predetermined width is moved in the direction in which the sliver 76 is combed by the upper comb 82 while holding the other end of the sliver 76 with the pressing members 78a, 78a. The short fibers that are not gripped by the pressing members 78a and 78a or the pressing members 78b and 78b are further combed by the lower comb 80 or the upper comb 82 to further align the single fibers.
When the sliver 76 composed of the natural fibers 16 heat-treated by the heat treatment apparatus shown in FIGS. 1 to 3 is supplied to the comber shown in FIG. 7, the string-like or film-like polymer impurities contained in the natural fibers 16 are contained. Since the lump formed by heat-treating the object is significantly thicker and shorter than the single fiber constituting the natural fiber, the lump is combed together with the short fiber by the lower comb 80 or the upper comb 82 and removed from the sliver 76.
[0015]
The slivers 76, 76, ... that passed through the combing process were stretched together, and after passing through the drawing process in which the unevenness in thickness was averaged, while being further stretched in the roving process, a slight twist was added to form a thick thread. Roving. Further, the roving yarn is twisted while being stretched in the spinning step, and a spun yarn having a desired thickness is obtained.
Even after the kneading step, the lump formed of the string-like or film-like polymer contaminants heat-treated by the heat treatment apparatus shown in FIGS. 1 to 3 is significantly thicker and shorter than the single fibers constituting the natural fibers. Because of the brittleness, when a bend or ironing or the like is added to the thread-like material mixed with the lump, the lump is finely crushed. Therefore, at the time of stretching in the roving process or the spinning process, the finely crushed lump is easily dropped from the filament and easily removed.
In addition, when the spun yarn wound on a bobbin or the like is supplied to the weaving machine, the lump that has not been removed in the spinning process and is mixed with the spun yarn is suitable for the weaving machine that supplies the spun yarn. In the finishing winding process performed, the spun yarn is easily detected by a sensor that senses a defect of the spun yarn, and the portion can be cut and removed.
[0016]
As described above, in any of the spinning processes, it is possible to remove a lump formed of a string-like or film-like polymer impurity which has been heat-treated by the heat treatment apparatus shown in FIGS. For this reason, the heat treatment by the heat treatment apparatus shown in FIGS. 1 to 3 may be any of the spinning steps. However, the heat treatment is not performed until the combing step, one of which is to remove neps or the like in natural fibers. Preferably, it is applied. In particular, by supplying the raw material subjected to the heat treatment by the heat treatment apparatus shown in FIGS. 1 to 3 to the washing step, the lump formed from the string-like or film-like polymer contaminants subjected to the heat treatment can be mixed with the natural fiber in the spinning step. Each time it passes through the various steps of For this reason, it is possible to obtain a spun yarn having a very small amount of lump composed of the heat-treated string-like or film-like polymer impurities, and it is possible to eliminate stain spots caused by the string-like or film-like polymer impurities. High quality yarn or woven or knitted fabric can be obtained.
1 and 2 show a steam heat treatment apparatus for supplying steam from the outside of the pressure vessel 10, but a predetermined amount of water stored in the pressure vessel 10 together with the natural fibers 16 containing polymer impurities. Alternatively, steam may be generated by irradiating electromagnetic waves such as high frequency waves and microwaves to generate natural water vapor, and the natural fiber 16 containing polymer impurities may be subjected to a steam heat treatment.
[0017]
【Example】
The present invention will be described in more detail by way of examples.
Example 1
The silk raw material mixed with the string-like polymer impurities made of polypropylene (PP) was subjected to wet heat treatment using the heat treatment apparatus shown in FIG. In this wet heat treatment, steam was supplied from the steam supply pipe 18 into the pressure vessel 10 in which the silk raw material was stored and the cylindrical body 12 was stored, and the temperature of the pressure vessel 10 was maintained at 160 ° C. for 20 seconds. During the wet heat treatment, the drain and a part of the steam were continuously extracted via the control valve 24 of the discharge pipe 22. In the silk raw material subjected to the wet heat treatment, the string-like polymer impurities made of PP were formed into large and small particles or rod-like aggregates, but silk fibers were not affected at all by visual observation. I didn't.
Next, the silk raw material subjected to the wet heat treatment was supplied to the step shown in FIG. 8 to produce a spun silk yarn, and it was observed how large and small particles and rod-like aggregates were removed.
The large particulate mass is removed in the fiber opening process shown in FIG. 4 or the fiber opening process shown in FIG. 5 and the carding process shown in FIG. 6, and the small particulate mass is removed. And in a combing process using a comber shown in FIG.
Further, the rod-shaped mass was removed in the fiber refining / carding process and the combing process, and was dropped and removed from the thread-like material during stretching in the roving process and the spinning process.
Further, the lump which was not removed in the spinning process and was mixed in the spun silk yarn was found in the finishing winding process by a sensor for sensing a defect of the spun silk yarn, and the portion was cut and removed.
When the fabric was woven using the silk spun yarn thus obtained and dyed black using a black cationic dye, no streaky spots due to PP impurities that did not stain the cationic dye could be found. .
[0018]
Example 2
Example 1 was the same as Example 1 except that the silk raw material mixed with the string-like polymer impurities made of polypropylene (PP) was washed in the washing step and then subjected to the wet heat treatment under the same conditions as in Example 1. A silk spun yarn was produced in the same manner as described above.
The fabric was woven using this silk spun yarn and dyed black using a black cationic dye. As a result, no streak-like spots due to PP impurities that did not stain the cationic dye could be found.
[0019]
Example 3
The silk raw material was subjected to wet heat treatment using the heat treatment apparatus shown in FIG. In this wet heat treatment, steam at a temperature of 170 ° C. was supplied from the steam supply pipe 34 into the pressure vessel 10 in which the silk raw material was stored and the cylindrical body 32 was accommodated, and the temperature of the pressure vessel 10 was maintained at 170 ° C. for 10 minutes. . After the completion of the wet heat treatment, the steam and the drain in the pressure vessel 10 were discharged from the discharge pipe 38.
Next, a silk spun yarn was produced in the same manner as in Example 1 using the silk raw material thus heat-treated.
The fabric was woven using this silk spun yarn and dyed black using a black cationic dye. As a result, no streak-like spots due to PP impurities that did not stain the cationic dye could be found.
[0020]
Example 4
After the silk raw material used in Example 1 was washed in a washing step, a mat-shaped silk fiber was wrapped into a paper wrap in a fiber opening step shown in FIG. 4 or a cotton baking machine shown in FIG. After that, a dry heat treatment was performed using the heat treatment apparatus shown in FIG. The dry heat treatment conditions were such that the running speed of the belt conveyor 50 on which the wrap was placed was adjusted, and hot air at a temperature of 170 ° C. was blown onto the wrap for 5 minutes.
Thereafter, the wrap was passed through a carding step and a combing step under the same conditions as in Example 1 to produce a spun silk yarn.
The fabric was woven using this silk spun yarn and dyed black using a black cationic dye. As a result, no streak-like spots due to PP impurities that did not stain the cationic dye could be found.
[0021]
Comparative Example A silk spun yarn was produced in the same manner as in Example 1 except that the silk raw material was not subjected to wet heat treatment.
The fabric was woven using the silk spun yarn and dyed black using a black cationic dye. As a result, stripe-like stained spots due to PP contaminants that did not stain with the cationic dye occurred in some places.
[0022]
【The invention's effect】
According to the present invention, even when a natural fiber such as cotton or silk containing a string-like or film-like polymer impurity is used as a raw material, the spinning from which the string-like or film-like polymer impurity is removed Yarn can be obtained.
For this reason, dyeing spots on the yarn or woven / knitted fabric due to the string-like or film-like high molecular impurities mixed in the spun yarn can be eliminated, and the quality of the obtained spun yarn can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic diagram for explaining an example of a heat treatment apparatus used for a heat treatment of the present invention.
FIG. 2 is a schematic diagram for explaining another example of the heat treatment apparatus used for the heat treatment of the present invention.
FIG. 3 is a schematic diagram for explaining another example of the heat treatment apparatus used for the heat treatment of the present invention.
FIG. 4 is a schematic diagram illustrating an example of a fiber opening machine used in the spinning process of the present invention.
FIG. 5 is a schematic diagram for explaining an example of a cotton swab used in a spinning process of the present invention.
FIG. 6 is a schematic diagram illustrating an example of a card used in a carding step in the spinning step of the present invention.
FIG. 7 is a principle diagram for explaining the principle of the comber used in the combing step in the spinning step of the present invention.
FIG. 8 is a process diagram for explaining a spinning process.
[Explanation of symbols]
Reference Signs List 10 pressure vessel 12, 32 cylinder 14 net 16 natural fiber 18, 34 steam supply pipe 20, 24, 36, 40 control valve 22, 38 discharge pipe 50 belt conveyor 64, 66 beater 65, 68 lattice 72 cylinder 74 flat 76 sliver 80 Lower comb 82 Upper comb 60, 62 Roller 70 Basket rollers 78a, 78b Push member

Claims (5)

When producing a spun yarn using natural fibers such as cotton or silk containing string-like or film-like polymer impurities as raw materials,
In any one of the production steps of the spun yarn, a heat treatment is performed on the natural fiber containing the polymer impurity at a temperature equal to or higher than the softening temperature of the polymer impurity and lower than the thermal decomposition temperature of the natural fiber. Applying the string-like or film-like polymer impurities to the mass, and removing the mass in a spun yarn production process. The method for producing a spun yarn according to claim 1, wherein the heat treatment of the natural fiber containing the polymer impurities is a wet heat treatment. 3. The method for producing a spun yarn according to claim 1, wherein the heat treatment is performed before the combing step. The method for producing a spun yarn according to any one of claims 1 to 3, wherein the heat treatment is a steam heat treatment in which the inside of a container filled with natural fibers containing a polymer impurity is maintained at a predetermined pressure by steam. 5. The heat treatment temperature is 150 to 170 ° C. when the polymer impurity is a string-like or film-like polymer impurity made of polyethylene or polypropylene, and the natural fiber is silk. A method for producing a spun yarn according to claim 1.

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