475results about "Inspecting textiles" patented technology

The invention belongs to the technical field of fabric breadth detection, and particularly relates to anti-wrinkle high-elasticity composite textile fabric breadth detection equipment which comprises a detection table, a feeding guide roller and a discharging guide roller which are arranged on the two sides of the top of the detection table, and a detection box fixedly arranged on the top of the detection table, a feeding hole and a discharging hole are respectively formed in two sides of the detection box, and a sealing door plate is arranged at the top of the detection box; and the dust detection mechanism is arranged on the side wall of the detection box. Through cooperative operation of the dust detection mechanism, the cleaning mechanism, the optical breadth detection mechanism, the electric signal adjusting mechanism, the marking mechanism and the like, the position of a detection component can be accurately adjusted according to the breadth of the fabric, dust and impurities of the fabric are cleaned, the device adapts to the fabrics with different thicknesses, breadth abnormal parts can be marked, meanwhile, the detection environment is optimized, and the detection efficiency is improved. The problems of measurement errors, dust interference and the like of existing equipment are effectively solved, and the detection precision, the applicability and the working efficiency are greatly improved.

The invention discloses a surface flaw detection device and process for carpet production, and relates to the technical field of surface flaw detection for carpet production. According to the surface flaw detection equipment and technology for carpet production, when carpet flaw detection is carried out, a carpet penetrates through the upper portion of an attaching roller, a second hydraulic cylinder is adjusted to drive a local jacking arc rod to jack up the local position of the carpet, the upper surface of the jacked-up carpet is in an unfolded state and expands towards the outer side, and meanwhile, the carpet passes through the attaching roller to be subjected to surface flaw detection. A driving motor is started, the driving motor drives all pressing pieces to press carpet wool at the two ends of the carpet unfolding position, and an electrostatic adsorption rod adsorbs the carpet wool at the position, so that the carpet wool at the two ends of the carpet position jacked by a local jacking arc rod gets close to the two ends; and the situation that the surface of the carpet cannot be clearly scanned by a scanning camera due to the existence of the carpet hair is avoided, so that the accuracy of a carpet surface flaw detection result is improved.

The invention discloses a tightening effect real-time monitoring method based on polyester fabric tightening equipment, and relates to the field of tension adjustment, and the method comprises the following steps: step 1, deploying tightening data acquisition equipment in a specified area of the tightening equipment; step 2, presetting a plurality of adjustment schemes when the tightening equipment performs tightening operation in different sections along the length direction, the width direction or the specific angle direction of the cloth, wherein each scheme comprises a target tightening speed set value and a target tightening amplitude set value in the direction; 3, the tightening data acquisition equipment sequentially or parallelly applies acting force to the polyester fabric at the tightening speed and the target tightening amplitude set in the adjustment scheme in different specified directions; by collecting the actual deformation quantity, the local flatness and the wrinkle generation coefficient of the polyester fabric and combining a preset speed and amplitude scheme and timing state evaluation, key parameters causing abnormal tightening can be accurately recognized and marked, and the marked parameters are subjected to simulation iteration correction.

The invention relates to the field of detection equipment, in particular to a hot air non-woven fabric detection device for non-woven fabric production, which comprises a detection box, a correction roller, a straightening mechanism, a cleaning mechanism and a detection plate, a feeding port and a discharging port are formed in the two ends of the detection box respectively, the two correcting rollers are rotationally arranged in the detection box, and the two straightening mechanisms are arranged on the corresponding correcting rollers and used for enabling the non-woven fabric to be tightened in a vertical state and unfolding wrinkles on the non-woven fabric at the same time; the cleaning mechanism is arranged in the detection box and located between the two correction rollers, and the cleaning mechanism is used for cleaning impurities on the two sides of the non-woven fabric; the detection plate is arranged in the detection box, and a plurality of shooting cameras and illuminating lamps are sequentially arranged on the detection plate. Through cooperation of the two correcting rollers and the straightening mechanism, the non-woven fabric can be stretched in multiple directions, wrinkles of the non-woven fabric can be avoided, the detection effect is ensured, and the cleaning effect of the cleaning mechanism can be improved.

According to the present invention, a read image of an object is used to detect a defect of the object or to acquire the width of the object.　In a first aspect, processing for detecting a defect of an object is executed sequentially using each of a plurality of read images. When a defect is detected, conveying of the object is stopped after L (L is an integer of 2 or more) specific read images including a first read image, which is the read image in which the defect was detected, have been acquired. In the processing for sequentially executing the detection processing, detection processing is executed using each of M (M is an integer of 2 or more and L or less) target read images including the first read image, among the L specific read images. In a second aspect, when a selvedge is detected from a read image, one or both of the acquisition of the width of fabric and the determination of the presence or absence of a defect of the fabric are executed, and in a first case, which is a specific case in which a selvedge is not detected from the read image, one or both of stopping the conveying of the fabric and issuing a notification are executed.

The invention discloses a garment fabric production and processing flaw detection device and a use method thereof, and relates to the technical field of garment fabric production and processing, the garment fabric production and processing flaw detection device comprises a workbench and a detection assembly, one side of the workbench is connected with a pressure supply assembly, the top of the workbench is provided with a self-adaptive assembly, and the detection assembly is arranged in the middle of the self-adaptive assembly; the detection assembly comprises supporting plates, a rotating plate, a driving rod, a detection cover, a guide rod, a pressing block and a sponge, the supporting plates are arranged in the center of the top of the self-adaptive assembly at equal intervals, and the rotating plate is rotationally connected to the upper ends of the supporting plates. The fan can convey external air filtered by the filter into the pressurizing cavity, at the moment, the top of the workbench is covered with the garment fabric, so that the top of the pressurizing cavity is shielded, air flow can only pass through fine gaps in the garment fabric, and when no broken yarn or hole exists in the surface of the fabric, the air flow can pass through the pressurizing cavity. The air flow penetrating through all parts of the fabric can be uniformly distributed, and the pressure of the air flow is dispersed.

The invention discloses a four-side elastic gauze fabric and a preparation process optimization method. The four-side elastic gauze fabric comprises a base cloth layer and a functional layer, the base cloth layer comprises the following components: 30%-50% of polyester fibers, 10%-30% of nanoparticles, 5%-10% of a composite material, 10%-15% of organic resin, 1%-8% of a binder, 5%-20% of spandex and 10%-30% of chinlon; the functional layer comprises the following components: 25%-35% of an anti-ultraviolet agent, 20%-45% of an antibacterial agent and 30%-50% of a softening agent; the anti-ultraviolet agent, the antibacterial agent and the softening agent are added into the fabric, the fabric elasticity can be improved while the fabric is resistant to ultraviolet rays and bacteria, in addition, defect analysis is conducted on the processed fabric through the ultrasonic technology, the processing technology parameters and the proportion value of different components are reversely adjusted according to the defect analysis result, the fabric processing efficiency is improved, and the fabric quality is improved. Meanwhile, it is guaranteed that the processed fabric has high elasticity and softness.

The gray cloth inspecting machine with the multiple detection functions comprises a machine frame, an unwinding roller, a driving assembly, a lighting assembly, a width measuring assembly, a weighing assembly and a control assembly, and supporting arms are arranged at the two ends of the machine frame; the two ends of the unwinding roller are connected with the two supporting arms respectively. The driving assembly is mounted on one side of the rack; the lighting assembly is installed in the middle of the rack. Two ends of the width measuring assembly are respectively connected with the two support arms; the weighing assembly is arranged behind the rack; and the control component is arranged in front of the rack. One end of a gray cloth roll can be limited through the limiting piece, the width of the gray cloth roll can be measured through scales on the scale roller, the length of the gray cloth roll can be measured through the counter, and whether the thickness of the gray cloth roll is qualified or not can be calculated through the weighing assembly and length and width data; the device can detect gray cloth in multiple items, is more intelligent and convenient, can improve the detection efficiency, ensures the product quality, is suitable for various gray cloth such as cotton, wool, hemp, silk, chemical fiber and composite materials, and is wide in range.

The invention belongs to the technical field of intelligent cloth inspection, packaging and sorting, and discloses an intelligent cloth inspection and packaging robot sorting method which comprises the steps that cloth inspection equipment inspects defect types of cloth and outputs corresponding data labels, visual code scanning and distribution are compared with preset cloth inspection data threshold values, and qualified products, to-be-reinspected products and inferior-quality products are judged and distributed; if a defective product is judged, the defective product enters a defective product discharging platform through a set conveying belt, the efficiency is greatly improved from inspection equipment detection, visual code scanning, packaging, labeling, robot sorting to the end, the cost is reduced, and the labor cost is greatly saved; the detection equipment can detect the cloth of 50-70 meters per minute, and the cloth detection efficiency is greatly improved by combining repairing, stain removal and thread hooking and trimming; the omission ratio is reduced every month, and the qualified rate is improved; the robot sorting and stacking efficiency is improved compared with manual work, and the cost is reduced; and quality optimization: the breakage rate is reduced, the omission ratio is reduced, and the qualified product rate is improved.

The invention discloses a defect treatment system for spunlace non-woven fabric. The system comprises a detection unit; a non-contact marking unit; a slitting and rewinding unit; the control unit is in communication connection with the detection unit, the non-contact marking unit and the slitting and rewinding unit and is configured to respond to the defect signal and determine delay trigger time based on the distance between the detection unit and the non-contact marking unit and the conveying speed of the non-woven fabric; after the delay triggering time, controlling a non-contact marking unit to spray a non-contact mark corresponding to the defect type to the side edge of the non-woven fabric; and under the condition that the unwinding length of the non-woven fabric by the slitting and rewinding unit is matched with the corresponding running length of the non-woven fabric when the defect signal is generated, the slitting and rewinding unit is controlled to remove the defective area on the non-woven fabric. The non-contact marking unit is matched with the control unit to determine the delay triggering time, so that the problem of inaccurate marking caused by shaking and airflow disturbance during high-speed operation of the non-woven fabric is solved.

The utility model relates to the technical field of cloth deviation rectification, in particular to an intelligent cloth inspecting machine with an unwinding deviation rectification function, which comprises a base, an unwinding frame, an unwinding roller and a traction roller, the unwinding frame is mounted on one side of the base, a support is fixedly mounted on the other side of the base, and the traction roller is rotatably mounted on the support through a rotating shaft; limiting mechanisms are installed on the two sides of the interior of the unwinding frame, each limiting mechanism comprises an installation base and a limiting plate, the installation bases are fixedly installed at the bottom of the unwinding frame, the limiting plates are installed on the installation bases in a sliding mode, and the limiting plates are connected with the installation bases through connecting springs arranged in the installation bases; a driving shaft is fixedly mounted on the traction roller; and the end part of the driving shaft is connected with the mounting seat through a bearing seat. According to the utility model, the flatness of the two sides of the cloth is improved, and the problem that the cloth with uneven edges deviates due to the tension difference between the inner layer and the outer layer when being unwound is solved.

The present invention relates to the technical field of fabric defect detection, and discloses a fabric surface quality detection apparatus, which comprises: a detection cabin, which is internally provided with a point marking system and defect detection systems on the upper and lower sides, and through which processing production line cloth passes; the punctuation system comprises a cloth supporting mechanism capable of expanding downwards, a transmission mechanism which is arranged between the side wall and the cloth and is driven by the cloth supporting mechanism, and an execution mechanism which is penetrated by the cloth and can horizontally move; the flaw detection system comprises a light intensity analyzer and a light source emitter which are arranged on the upper side and the lower side of the cloth, and the light intensity analyzer analyzes and captures light spot intensity; the cloth supporting mechanism supports the cloth, moves downwards to trigger the transmission mechanism to move axially, drives the execution mechanism to expand towards the two sides to complete cleaning, moves backwards to the outer side of the projection of the light source emitter, detects flaws through a light intensity threshold value and outputs coordinates; during resetting, the cloth supporting mechanism moves upwards to close the executing mechanism, and dotting marks are triggered when the cloth supporting mechanism falls at the flaw position.

The present invention relates to the technical field of textile equipment, and in particular to a multi-stage finishing device for knitted fabrics. The multi-stage finishing device for knitted fabrics of the present invention comprises a pair of double-spread thread rollers, an infrared weft bias line detection device, two pairs of single-spread thread rollers, and an ironing and shaping component that are sequentially arranged along the moving direction of the knitted fabric; it also comprises a driving component for driving the single-spread thread rollers to rotate, and the driving component is electrically connected to the infrared weft bias line detection device; the surface of the double-spread thread rollers has threads extending from the middle section of the roller to both ends; the threads of the two pairs of single-spread thread rollers are in opposite directions. The multi-stage finishing device for knitted fabrics of the present invention combines the functions of fabric extension, weft bias line detection, weft bias elimination, ironing and shaping, and winding into one, which greatly shortens the finishing distance of the knitted fabrics.

The invention relates to the related technical field of cloth inspection, in particular to a cloth inspecting device with a tension and tightness adjusting function and a cloth inspecting method.The cloth inspecting device with the tension and tightness adjusting function comprises a rack, a guide roller set arranged on the rack and a cloth inspecting mechanism installed on the rack and used for inspecting cloth; the guide roller set comprises a first roller piece and a second roller piece which are rotationally installed on the rack, and a third roller piece which is movably arranged on the rack and located between the first roller piece and the second roller piece. The third roller piece is connected with elastic supporting mechanisms arranged on the two sides of the rack respectively. The cross arm is driven to ascend through the power mechanism, the tension and tightness of the cloth can be adjusted before pleat removal treatment, the situation that the cloth is excessively stretched and deformed in a two-way stress state due to the fact that the cloth maintains the original tension during pleat removal treatment, the original texture structure and defect morphological characteristics of the cloth are changed, and the pleat removal efficiency is improved can be avoided. The defect identification difficulty is increased, and the reliability of a detection result is influenced.

The application discloses a kind of glass fibre mesh cloth defect detection method and system, it is related to intelligent detection related technical field, this method includes: by setting shooting parameter is moved to the target glass fibre mesh cloth and is photographed, obtains detection target image information.Acquisition is placed background image, and the coupling feature analysis is carried out to placed background image, determines coupling influence parameter.Based on coupling influence parameter, background decoupling is carried out to detection target image information, and target image is extracted.Target image is meshed and segmented, and image mesh segmentation library is obtained.Extract defect feature is used to traverse image mesh segmentation library, and defect detection result is obtained.The technical problem that the glass fibre mesh cloth defect detection method in prior art is difficult to execute detection task under complex environment, leading to insufficient detection accuracy and reliability is solved.High-efficiency, accurate detection glass fibre mesh cloth defect is realized, and the technical effect that the accuracy of detection and the adaptability of system are greatly improved.

The invention mainly discloses a quality detection cooperative interaction suite group, which is used for performing defect detection on a continuous material conveyed by a roll-to-roll mechanism. Particularly, the quality detection cooperative interaction suite set further provides the following functions: (1) intuitively displaying the position of the detected flaw on the continuous material; (2) when the flaw detection result is misjudged, a user (a quality inspector) operates a tablet computer provided by the quality detection collaborative interaction suite group to delete the misjudged flaw detection result online; (3) when a flaw category identification error occurs in a flaw detection result, the user operates the tablet computer to correct the flaw category identified by the error online; and (4) when missing detection occurs, the user operates the tablet computer to add one or more images containing flaws into the database.

The utility model relates to the technical field of textile, and discloses a needle inspection machine for textile, which comprises a feeding conveyor, an inspection machine body is arranged on the feeding conveyor, a connecting frame is fixedly mounted between the feeding conveyor and a first discharging conveyor, movable rollers are uniformly and rotatably mounted on the connecting frame, a mounting frame is fixedly mounted on the connecting frame, and the movable rollers are rotatably mounted on the mounting frame. An auxiliary classification assembly is arranged on the installation frame, an infrared emitter is fixedly installed on one side of the connecting frame, and an infrared receiver is fixedly installed on the side, opposite to the infrared emitter, of the connecting frame. According to the utility model, the auxiliary classification assembly is arranged, unqualified textiles are pushed to the unqualified product collection area for centralized collection, and qualified textiles can be normally conveyed to the qualified product collection area for centralized collection, so that the textiles are classified and collected in a centralized manner when broken needle inspection is carried out on the textiles; subsequent personnel can conveniently carry out centralized treatment on unqualified textiles containing broken needles, and the overall inspection and treatment efficiency is improved.

The utility model discloses a needle inspecting machine for garment processing. The needle inspecting machine comprises a rack, a conveying belt, a wiping and cleaning mechanism and an auxiliary cleaning mechanism. And a conveyor belt is assembled in the rack. The wiping and cleaning mechanism is fixedly assembled on one side of the rack and comprises a cleaning box, a pair of tensioning rollers are rotationally connected into the cleaning box, the outer sides of the pair of tensioning rollers are sleeved with wiping cotton layers, and the wiping cotton layers and the conveying belt are arranged in a matched mode. And the auxiliary cleaning mechanism is fixedly assembled below the rack and comprises a dry cleaning layer, the dry cleaning layer is fixedly assembled below the conveying belt, and a plurality of sets of evenly-distributed cleaning nozzles are fixedly assembled on the side, away from the dry cleaning layer, of the wiping cotton layer. According to the needle inspecting machine for garment processing, the wiping and cleaning mechanism is arranged, the conveying belt can be automatically cleaned in real time, the process of cleaning the conveying belt is simplified, and convenience and real-time performance of cleaning the conveying belt are improved.

To provide a technique for accurately evaluating the discharge amount of micro-plastic fibers in a treatment liquid after cleaning a textile product.SOLUTION: A micro-plastic fiber evaluation method according to one embodiment of the present invention is a micro-plastic fiber evaluation method for evaluating the discharge amount of the micro-plastic fiber in a treatment liquid after cleaning a fiber product. The evaluation method includes a step of detecting a micro-plastic fiber from an image in which the processing liquid is imaged, and a step of evaluating the discharge amount of the micro-plastic fiber by calculating the amount of the detected micro-plastic fiber.SELECTED DRAWING: Figure 4

The application relates to the technical field of cloth production equipment, and provides a quality detection device for cloth, which comprises an inspection table, a material conveying assembly, a lifting frame and a supporting piece, the lifting frame is arranged on the inspection table, the supporting piece is arranged on the lifting frame and located above the table top of the inspection table, and the supporting piece is used for supporting lace fabric; the material conveying assembly is arranged on the inspection table and located on the same side of the lifting frame, and the material conveying assembly is used for conveying the lace fabric supported by the supporting piece. The application has the effect of reducing the length of the whole inspection table when the quality of the lace fabric is inspected.

The invention relates to the technical field of electronic-grade glass fiber cloth production, in particular to an electronic-grade glass fiber cloth surface flaw modification method, which comprises the following steps of: flatly paving electronic-grade glass fiber cloth to be modified on a platform, scanning the cloth surface by adopting a visual inspection device, and identifying and recording the position of the cloth surface flaw; positioning cloth surface flaws, specifically modifying the cloth surface flaws by adopting a correction needle, and wiping the modified electronic-grade glass fiber cloth surface to be flat by adopting a modification wiping rag; and scanning the modified electronic-grade glass fiber cloth through the visual detection device again, and checking the modification effect. According to the method, the defects of the cloth cover are accurately positioned, the correction needle with the matched specification is adopted for targeted treatment, and the steps of wiping and flattening after modification and adhesive spraying and curing are matched, so that the common cloth cover problems such as broken weft, loose loop weft and abnormal follow-up yarn can be efficiently solved, the flatness and the structural stability of the modified cloth cover can be guaranteed, and the service life of the cloth cover is prolonged. And subsequent secondary visual detection further ensures the modification effect.

The invention provides a yarn detection device and a detection system, and relates to the technical field of yarn hairiness visual detection, the yarn detection device comprises a detection module and two position stabilizing units, and the two position stabilizing units are symmetrically arranged relative to a detection area of the detection module. According to the yarn detection device, the two stabilizing units and the detection module located between the two stabilizing units are designed, the stabilizing units apply force facing the outer side to the two ends of the yarn in the detection area respectively, the force at the two ends is in a balanced state, and winding / releasing movement in the yarn production and manufacturing process is not affected; the two position stabilizing units apply force towards the outer side to the two ends of the yarn in the detection area respectively, so that the yarn in the detection area is in a stable tensioning state, in the image obtained by the detection module, the tensioning force borne by the yarn is very stable, and the reliability of the detection structure is guaranteed.

The invention discloses a manufacturing process of a home textile functional fabric quilt cover capable of quickly changing specifications, and relates to the technical field of home textile product production and processing. The left side, the right side and the head side of the quilt cover face and the quilt cover lining are connected in a sewing mode, the foot sides of the quilt cover face and the quilt cover lining are connected through a quilt foot closed-end zipper, the right sides of the left small piece of the quilt cover face and the left small piece of the quilt cover lining are further connected through an invisible open-end zipper, and the right sides of the right small piece of the quilt cover face and the right small piece of the quilt cover lining are further connected through another invisible open-end zipper. When one or two invisible separating zippers are opened or closed respectively, the width specification of the quilt cover can be quickly changed; the quilt cover manufacturing process mainly comprises the working procedures of cutting, sewing, steam ironing, packaging and the like. According to the invention, the influence of softness, thinness and drapability of the fiber fabric on the product quality is better controlled, the purpose of quickly changing the width specification of the quilt cover can be achieved, the quilt cover can be better matched with quilt cores with different specifications and sizes, the air permeability, comfort, softness and attractiveness of the product are maintained, and the function of one bed with multiple purposes is realized.

The utility model relates to the field of fabric correction, in particular to a fabric corner falling correction device and a weft straightener. The fabric corner falling correction device comprises a multi-section roller and at least one corner lifting assembly, the multi-section roller is used for supporting running fabric, the middle portion of the multi-section roller is a long roller face, the two ends of the multi-section roller are each provided with a plurality of short roller faces, and the short roller faces are arranged to be capable of passively and independently rotating; the corner lifting assembly is used for tightly pressing the side edge of the side where the corner of the fabric is located on the corresponding short roller face when the corner of the fabric is lost, and driving the corresponding side edge of the fabric to move at the linear speed different from the running speed of the fabric so as to correct the lost edge. The utility model can realize fabric corner loss correction and eliminate the defect of corner loss.

The invention relates to a computer-implemented method for optically characterizing a textile fiber structure. A plurality of pieces of information on the color at different locations of the textile fiber structure are detected by an optical sensor system. The detected color information is transmitted to a computer (107) and is entered into a color space (2) in the form of a scatter plot (31) by the computer. A frequency density distribution (4) of the scatter plot (31) is determined, and the frequency density distribution (4) is numerically specified. The invention allows a change in the material of the textile fiber structure to be ascertained and optimizes the elimination of foreign materials from the textile fiber structure.

An apparatus for providing a moist material to be dried includes at least a material supply unit (102), a plurality of nozzles (104), and a drying surface (106), the drying surface being configured to be movable relative to the plurality of nozzles. The material supply unit is configured to direct the moist material through the plurality of nozzles and onto the drying surface to obtain a plurality of elongated, string-like accumulations of material (108). The apparatus additionally includes at least one imaging device (110) configured to obtain imaging data of at least one of the elongated, string-like accumulations of material, and at least one control unit (112) configured to determine at least one characteristic of at least one of the elongated, string-like accumulations of material, the control unit additionally configured to facilitate performance of at least one action based on the determined characteristic.

The utility model discloses a home textile functional fabric quilt cover capable of quickly changing specifications, and relates to the technical field of home textile product production and processing. The left side, the right side and the head side of the quilt cover face and the quilt cover lining are connected in a sewing mode, the foot sides of the quilt cover face and the quilt cover lining are connected through a quilt foot closed-end zipper, the right sides of the left small piece of the quilt cover face and the left small piece of the quilt cover lining are further connected through an invisible open-end zipper, and the right sides of the right small piece of the quilt cover face and the right small piece of the quilt cover lining are further connected through another invisible open-end zipper. When one or two invisible separating zippers are opened or closed respectively, the width specification of the quilt cover can be quickly changed. According to the utility model, the influence of softness, thinness and drapability of the fiber fabric on the product quality is better controlled, the purpose of quickly changing the width specification of the quilt cover can be achieved, the quilt cover can be better matched with quilt cores with different specifications and sizes, the air permeability, comfort, softness and attractiveness of the product are kept, and the function of one bed with multiple purposes is realized.

Disclosed are improved methods for inspecting tow for contamination, defects, and / or imperfections, for example cellulose acetate tow. The present disclosure can also relate to processes for producing cellulose acetate tow that involve detecting and analyzing contamination, defects, and / or imperfections in the tow. The methods can result in cellulose acetate that has fewer contamination, defects, and / or imperfections than has been previously achieved.

A presumption program (128) capable of presuming the possibility of generation of stain spots on a drawn yarn produced by a spinning drawing device (3) that draws the yarn while heating the yarn causes an information processing device (100) to execute the following steps: acquiring an auto-encoder (124); the auto-encoder (124) learns in such a manner that a normal tension waveform indicating the normal displacement of the tension of the drawn wire is restored after being compressed. Acquiring an input tension waveform indicating the displacement of the tension of the drawn yarn produced by the spinning drawing device (3); and estimating, on the basis of the similarity between the input tension waveform and the output tension waveform obtained from the auto-encoder (124) by inputting the input tension waveform to the auto-encoder (124), the likelihood of the occurrence of stain spots for the drawn yarn produced by the spinning drawing device (3).