JP2805279B2 - Inspection method for the presence of impurities in yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning process in which a raw cotton packing material or a part of an operator's article worn or held by an operator is mixed into the raw cotton to remove a defective spun yarn containing impurities. The present invention relates to an inspection method for detecting an occurrence of an accident and detecting a defective portion so that the defective portion can be removed.

[0002]

2. Description of the Related Art Conventionally, at the time of spinning, raw cotton is packed through a sheet-like packing material, transported, and then unpacked.
Raw cotton after unpacking is spun in the spinning process.

[0003] In the spinning step, the compressed and packed raw cotton is unwound, wrapped to remove foreign matter, and combed to remove foreign matter such as fine nep leaves and to make the fibers parallel. This is a mechanical processing step in which a sliver in the form of an alignment string is produced, several pieces of the sliver are further aligned and stretched, gradually made into a thin thread, and twisted to give a thread of a required thickness. Therefore, usually, a cotton batter process, a carding process, a combing process, a drawing process, a roving process,
A spinning step.

[0004] In the mixed cotton baking step, the packing material and the like of the compressed cotton that has been packed are removed and left for about 24 hours to allow the natural cotton to expand naturally with room air to balance the water content. Next, the raw cotton harmonized with the predetermined cotton mixing ratio is put into the machine, passed through a series of processes such as a cotton opener, a dust remover, and a cotton batter, and the unwinding and cotton mixing of the raw cotton are repeated by a spike beater or the like. Then, an operation of removing leaf residue seed pieces, stem pieces, fiber pieces, dust and the like adhering to the raw cotton is performed to produce a clean and uniform wrap.

[0005] In the carding step, a large number of fibers are entangled, contaminants or immature fibers, short fibers, fiber lumps, etc., which are unsuitable for spinning, remain in the wrap produced by the above-mentioned cotton blending step. Since the fibers are combed with a takein, a cylinder and a flat cloth, they are removed to make the fibers somewhat parallel. The fiber transferred to the needle of the doffer is scraped off with a fly comb that moves up and down at a high speed to form a thin cotton fiber layer, which is collected into a string-like sliver and placed in a can.

In the combing step, the card sliver is further polymerized, drafted to align the fibers more parallel, and short fibers, neps, etc., which cannot be removed in the carding step by a complete combing action, are removed. This is for producing a uniform sliver, and is used for producing combed yarn.

In the drawing step, the sliver that has undergone the carding step or the combing step has thick and thin unevenness of the NEP and unevenness in the thickness of the sliver due to the unevenness of the cotton between the machine stands. For this reason, six or eight slivers are combined and stretched and evened to eliminate the shrinkage of the fibers and to align them in parallel.

In the roving step, the uniform sliver produced in the drawing step is further stretched so that the sliver can be set on a spinning machine, twisted, and wound on a roving bobbin for easy handling. Incidentally, this roving step may be omitted.

The spinning step is a step of drafting a roving yarn to a required thickness, giving it an appropriate twist, and winding it around a wooden pipe, and is a final step of spinning to be a yarn.

[0010]

In the above-mentioned spinning, when unpacking the transported raw cotton or transferring the unpacked raw cotton to the blending cotton process, packing materials, such as gloves and handkerchiefs, are used. , Towels, work clothes, hats, etc., may be mixed into the raw cotton by a worker article made of a knitted fabric or a sheet-like material worn or held by the worker.

By the way, the packing material or the worker's article mixed in the raw cotton is repeatedly unwound and mixed with the spike beater or the like in the blended cotton process, or combed with the needle cloth or the like in the carding process. The fiber is unwound in a fibrous form after being split and split, and is diffused as a contaminant in the raw cotton material.

For example, when the packing material mixed with the raw cotton is made of a plastic sheet such as a drawn plastic film material such as polypropylene, the long and short fibers of the plastic torn in the drawing direction of the film are mixed and diffused into the raw cotton material. Further, when the knitted fabric or sheet constituting the worker article mixed with the raw cotton is made of a special cotton yarn such as a synthetic fiber, the unwound different fibers are mixed and diffused into the raw cotton material.

Therefore, at present, the raw cotton material containing such impurities is slivered as it is through a combing step and a drawing step, and is spun through a spinning step.

However, the spun yarn that has undergone the above-described steps has a fatal defect in the knitted fabric provided by knitting the spun yarn because impurities contained in the yarn appear as impurities. That is, in the case of a woven fabric, since the warp or the weft contains the impurities regularly or irregularly, when the woven fabric is dyed, uneven dyeing occurs between a portion containing the impurities and a portion not containing the impurities, This results in a so-called marbled defect pattern.

For example, when the foreign matter contained in the yarn is a plastic fiber such as polypropylene as described above,
The part is not stained. In addition, when the impurities are fibers of a special cotton yarn made of a material different from that of the raw cotton, a difference occurs in the degree of dyeing between the portion and the other portion.

In order to solve the above problem, basically, it is only necessary to prevent packing materials and worker articles from being mixed in the raw cotton, but it is difficult to realize in view of the management situation at the work site. It is. Alternatively, it is possible to solve the problem if it is possible to detect and remove such foreign matter mixed in the raw cotton during the mixed cotton baking process or the carding process,
This is not feasible under the current situation.

According to an investigation conducted by the present inventor on this point, the contaminants that cause the above-mentioned yarn defects are often made of packing material made of raw cotton or, for example, gloves, It is a worker article consisting of a knitted fabric or a sheet-like material worn or held by the worker, such as a handkerchief, a towel, a work clothes, a hat, etc., and it has been found that this is based on the result of being mixed into raw cotton. .

According to the inventor's repeated experiments and studies, the presence or absence of such contaminants is detected by electrical, optical and mechanical means because they are extremely fine. This involves considerable difficulty, and there are many problems to be solved for practical use.

[0019]

SUMMARY OF THE INVENTION Accordingly, the present invention is to provide a packing material of raw cotton or an operator's article as described above so that the material is formed in advance so that the material can be detected later. The present invention also provides a method for inspecting the presence or absence of impurities in a yarn which is easily detected when the yarn is formed as a sliver or a spun yarn in a spinning process.

Therefore, the present invention is configured as a first means in a packing step of packing the raw cotton through a sheet-like packing material, an unpacking step of unpacking the transported raw cotton, and A spinning step of spinning the raw cotton of at least a blended cotton step, a carding step, a roving step, and a spinning step, wherein the packing material contains a conductive material before providing the packing material. A packing material forming step to be carried out, and an inspection step of electrically inspecting the running yarn for the presence or absence of a conductive substance during or after the roving step and / or the spinning step. On the point.

Further, the present invention is configured as a second means, wherein the unpacking process of unpacking the packed cotton, at least the blending cotton process, the carding process and the roving process of the unpacked cotton are carried out. A spinning process including a spinning process and a spinning process, wherein an operator engaged in the unpacking process and / or the mixed cotton wool process wears or holds a knitted fabric or sheet-like worker article. When providing, the conductive material in the running yarn during the worker article forming step of preliminarily including a conductive substance in the material of the worker article and the roving step and / or the spinning step or after these steps. And an inspection step of electrically inspecting for the presence or absence of.

Further, the present invention is configured as a third means, wherein a spinning step of spinning the unpacked raw cotton at least including a blended cotton step, a carding step, a roving step, and a spinning step. In the art, during or after the roving and / or spinning steps, the yarn is run through a sensor slot with a pair of sensors facing each other to detect the presence or absence of conductive material in the yarn, The point is to detect the presence of impurities when the electric capacity exceeds a predetermined value from the change in the dielectric constant due to the presence or absence of the conductive substance.

[0023]

Embodiments of the present invention will be described below in detail.

In the present invention, the spinning technique is the same as the conventional technique described above. That is, the raw cotton is packed via a sheet-like packing material at a production center (packing process) and transported to a spinning factory. After transportation, the raw cotton is unpacked (unpacking process),
It is spun in the spinning process and shipped as spun yarn.

The spinning step includes a cotton blending step, a carding step, a combing step, a drawing step, a roving step, and a spinning step, and each step is the same as described above for the prior art.

The sheet-like packing material used in the above-mentioned packing step is, for example, formed into a sheet by braiding a thin tape-like film made of a stretched or non-stretched film made of polypropylene or other plastic material. However, when the film is formed, a conductive substance such as carbon is mixed in the raw material plastic in advance. Alternatively, when a film formed from an insulating plastic material is subjected to secondary processing, a conductive material such as carbon may be coated or a film containing a conductive material may be laminated. Alternatively, the packing material is not limited to carbon, but may be a commercially available conductive film (manufactured by Sumitomo Bakelite) obtained by subjecting a polyethersulfone-based resin film to an indium-tin oxide film treatment. In any case, when the packing material is provided, a packing material forming step of previously including a conductive material in the packing material is performed.

In the unpacking step or the blended cotton step, the worker engaged in the work may be a personal item made of a knitted fabric or sheet-like material such as gloves, handkerchiefs, towels, work clothes, hats and the like. The wearable article is worn or held as a worker article. When such a worker article is formed, a conductive material is previously contained in a material of the worker article. For example, in a case where the worker article is manufactured from a sheet, the above-described conductive film material may be used for the packing material. Alternatively, in a case where the worker article is made of a knitted fabric such as a knitted fabric or a woven fabric, a conductive fiber such as a carbon fiber or a metal fiber may be used as a material of a yarn constituting the knitted fabric. Therefore, in this case, when providing the worker article, a worker article forming step of previously including a conductive substance in the worker article is performed.

Therefore, if such packing materials and worker's articles are mixed into the raw cotton during the unpacking process and the blended cotton process due to the worker's accident, the unwinding of the raw cotton and the blending action in the blended cotton process are performed. By repetition and combing with a cloth needle or the like in the subsequent carding step, the fiber is torn and cut, unwound into a fibrous form, and diffusely mixed as impurities in the raw cotton material. Then, the raw cotton material containing impurities is turned into a sliver through a combing step and a drawing step, and is spun through a spinning step.

For this reason, the roving yarn wound on the roving bobbin in the roving process and the spun yarn wound on the wooden tube in the spinning process of drafting and twisting the roving yarn must contain impurities in the yarn. become.

Meanwhile, in the present invention, the yarn containing such contaminants is used during or after the winding in the roving step and / or the winding in the spinning step. During the running by winding the yarn around a winder or bobbin, the yarn is inspected for the presence of foreign matter.

For this inspection, capacitance type sensor means can be used. That is, by running while inserting the yarn into the sensor slot with a pair of electrodes facing each other, when the electric capacity exceeds a predetermined value from a change in the dielectric constant due to the presence or absence of a conductive substance, there is an impurity, Therefore, it can be detected that there is a yarn defect.

That is, the sensor means electronically detects a change in electric capacity from a change in dielectric constant due to a change in weight of the yarn traveling while passing through the sensor slot, and constantly generates a yarn signal. This thread signal appears as a waveform that fluctuates within a predetermined sensitivity level ± α% with respect to the reference level ± 0%. Then, when the impurities of the conductive substance contained in the yarn come to the sensor slot, the dielectric constant changes in a direction to become extremely small, so that a peak waveform exceeding much more than the sensitivity level + α% appears.

Therefore, for example, a peak waveform exceeding a predetermined sensitivity level + α% set in the level comparing circuit is detected by inputting the thread signal output from the sensor means to the level comparing circuit via an amplifier. Can be.

In the preferred embodiment of the present invention, when a peak waveform indicating the presence of the above-described contaminants is detected, a warning signal is output from the level comparison circuit to activate the cut trigger signal generation circuit, and the cut trigger signal generation circuit is activated. By inputting the cut trigger signal from the trigger signal generation circuit to the cutter driving circuit, the cutter means is operated, the yarn is automatically cut, and the yarn portion containing the foreign substances can be removed.

[0035]

According to the first aspect of the present invention, the packing material is mixed with the raw cotton in the unpacking process and the blended cotton process, and the packing material is unwound and contained as impurities in the yarn. In this case, there is an effect that the presence or absence of the contaminant can be easily detected.

According to the second aspect of the present invention, in the unpacking step and the cotton blending step, knitting such as gloves, handkerchiefs, towels, work clothes, hats and the like worn or held by an engaged worker. When a worker's article made of a woven or sheet-like material is mixed with raw cotton and the worker's article is unwound and is contained as a foreign matter in a yarn, the effect that the presence or absence of the foreign matter can be easily detected. There is.

According to the third aspect of the present invention, when impurities such as conductive substances are contained in the yarn, the presence or absence of the impurities can be easily and accurately detected. Therefore, it is not limited to packaging materials and worker goods,
By forming various articles made of a knitted fabric or a sheet-like material that may be mixed with raw cotton by a conductive material in advance, it is possible to inspect whether or not these are contained as impurities in the yarn. Become.

Claims (3)

(57) [Claims] 1. A packing step of packing raw cotton through a sheet-like packing material, and an unpacking step of unpacking the transported raw cotton.
In a spinning technique including a spinning step of spinning the unpacked raw cotton including at least a blended cotton step, a carding step, a roving step, and a spinning step, when providing the packing material, a conductive material is added to the packing material in advance. A packing material forming step of containing a substance, and an inspection step of electrically inspecting for the presence or absence of a conductive substance in the running yarn during or after the roving step and / or the spinning step. A method for inspecting the presence or absence of impurities in a yarn, characterized by comprising: 2. An unpacking step for unpacking the packed raw cotton,
In a spinning technique including a spinning step of spinning unpacked raw cotton at least including a blended cotton step, a carding step, a roving step, and a spinning step, engaged in the unpacking step and / or the blended cotton step. When providing a worker article made of a knitted fabric or a sheet-like material worn or held by the worker, a worker article forming step of previously incorporating a conductive substance into a material of the worker article, and the roving step and / or An inspecting step of electrically inspecting the running yarn for the presence or absence of a conductive substance during or after the spinning step, and a method for inspecting for the presence or absence of impurities in the yarn. . 3. A spinning technique comprising a spinning step of spinning unpacked raw cotton including at least a blended cotton step, a carding step, a roving step, and a spinning step, wherein the spinning step comprises: After these steps, in order to detect the presence or absence of a conductive substance in the yarn, the yarn is run through a sensor slot in which a pair of electrodes face each other. A method for detecting the presence or absence of impurities in a yarn, characterized by detecting the presence of impurities when the value exceeds a predetermined value.