JP2022125981A - Evaluation method of cloth - Google Patents

Abstract

To provide a method for quantitatively evaluating the amount of fiber waste of cloth generated.SOLUTION: The evaluation method of cloth includes a step of cleaning the cloth having edges treated for preventing exfoliation of fiber waste, a step of collecting fiber waste generated in the cleaning step with a collector, and a step of measuring the weight of the fiber waster collected.SELECTED DRAWING: None

Description

The present invention relates to a method for evaluating fabrics.

In recent years, there has been concern about the adverse effects on ecosystems caused by the uptake of plastic waste in oceans and rivers by organisms. Of particular concern are plastic containers that have been miniaturized by ultraviolet rays and become micro-sized pieces of plastic. Gender is debated.

Textile products currently on the market, especially functional textile products manufactured for sports and outdoor use, often use synthetic fibers, and the synthetic fibers may come off as fiber waste during washing. For example, materials such as fleece that have been raised on the surface of the cloth to make the fibers fluffed may fall off from the raised part of the fabric during washing, and the amount of fiber waste generated is lower than that of non-raised materials. tend to be many.

On the other hand, JIS L1096 (2010), JIS L0844, ISO 7768 (2009), etc. are standardized as evaluation methods for washing. However, all of these are test methods focusing on the quality of the washed items, such as the dimensional stability, washing fastness, and wrinkle characteristics of the washed items. In addition, since cloth is damaged by being exposed to high mechanical stress such as washing, a standard test for detecting this mechanical stress has been proposed (see, for example, Patent Document 1). On the other hand, recently, in view of the problem of fiber waste generated during washing, a laundry bag with enhanced fiber waste collecting ability has been proposed (see, for example, Patent Document 2).

Japanese Patent Publication No. 2006-521475 Japanese Patent Publication No. 2019-505351

Fiber waste generated by washing or the like is generally removed from the washing liquid, washing wastewater, or the like and discarded. Considering the possibility of various problems such as an increase in waste, waste water treatment load, maintenance load of washing machines, etc., it is preferable that the amount of such fiber waste is as small as possible. These problems can be solved by fabrics with a reduced amount of fiber waste generated, but no methods have been proposed so far for evaluating fabrics that suppress the amount of fiber waste generated during washing. The problem is that although there is a clear difference between high and low lint fabrics, there is no way to compare them.

For example, the above-mentioned JIS and ISO standards are evaluation methods focused on the items to be washed during washing, and do not mention anything about fiber waste generated from the items to be washed. In addition, the invention disclosed in Patent Document 1 is also an evaluation object, and does not describe a method for evaluating cloth or fiber waste. On the other hand, Japanese Patent Laid-Open No. 2002-200001 describes focusing on fiber waste, such as putting the fiber product in a washing bag and washing it, and preventing the fiber waste generated from the fiber product from being discharged into the drain. However, there is no description of a method for evaluating fiber waste generated from cloth. Conventionally, it has been assumed that textile waste is generated from cloth, so to speak, the point of view is to create a quantitative evaluation method for the textile waste generated by washing, and to create a cloth that suppresses the generation of fiber waste. It seems that there was no

If the fabric suppresses the generation of fiber waste, the generation of fiber waste of the textile product can be suppressed. Therefore, a new problem arose: creating a method for quantitatively evaluating fiber waste generated from cloth with good reproducibility.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for evaluating fiber waste generated from fabrics during laundering.

In order to solve the above problems, the present invention has the following configurations.
(1) A step of washing cloth whose ends have been treated to prevent fiber scraps from falling off,
a step of collecting fiber waste generated by the washing step with a collector;
measuring the weight of the collected fiber waste;
A method of evaluating fabrics, including
(2) In the step of performing the washing step using a washing machine and collecting the fiber waste generated by the washing step with a collector, the collector is attached to the drain port of the washing machine to remove the fiber waste from the washing process. The method for evaluating the cloth according to (1), wherein the cloth is collected from the waste water flowing from the drain port of the machine.
(3) The fabric evaluation method according to (1) or (2), wherein the treatment to prevent fiber waste from falling off is any one of melt cutting treatment, piping treatment, overlock treatment, adhesive tape treatment, and sealing tape treatment. .
(4) The fabric evaluation method according to any one of (1) to (3), wherein the treatment to prevent fiber scraps from falling off is a process of adhering the fabric so that the edges of the fabric are sandwiched between two seal tapes.
(5) The method for evaluating a cloth according to any one of (1) to (4), wherein the treatment for preventing the fall of fiber scraps is applied within a range of 5.0 cm or less from the edge of the cloth.
(6) The fabric evaluation method according to any one of (1) to (5), wherein the fabric has an effective evaluation area of 30 to 70000 cm ² .
(7) The fabric evaluation method according to any one of (1) to (6), wherein the collector has an opening of 5 to 20 μm.
(8) The fabric evaluation method according to any one of (1) to (7), wherein the collector has a drainability of 300 seconds or less measured in the following order.
Drainability measurement procedure (a) A circular sheet with a diameter of 20 cm cut from the collector is folded into four and set in a triangular funnel with a diameter of 22 cm.
(b) Pour in 300 ml of distilled water, measure the time from when the first drop falls from the funnel to when the last drop falls from the funnel, and determine the drainability.
(c) The last drop is determined to be the last drop if the next water drop does not fall for 5 minutes or more.
(9) The fabric evaluation method according to any one of (1) to (8), wherein the washing step is performed using a washing machine and washing conditions specified in ISO 6330 (2012).
(10) The fabric evaluation method according to any one of (1) to (9), wherein the washing step is performed using a C-type standard washing machine and 4N method conditions specified in ISO 6330 (2012).

According to the present invention, it is possible to provide a cloth evaluation method for quantitatively evaluating the amount of fiber waste generated with good reproducibility. This facilitates the creation of fabrics with reduced fiber waste.

The fabric referred to in the present invention is not particularly limited, and may be a woven fabric, a knitted fabric, or a non-woven fabric. When the cloth is a woven fabric, the weave structure is not particularly limited. , multiple weave, warp pile weave, weft pile weave, leno weave, and the like. Further, when the cloth is a knitted fabric, the knitting structure is not particularly limited. Examples include knitting (double-sided knitting), rubber knitting, pearl knitting, Denby weaving, cord weaving, atlas weaving, chain weaving, and insertion weaving. Nonwoven fabrics include needle-punched nonwoven fabrics, chemical-bonded nonwoven fabrics, thermal-bonded nonwoven fabrics, spunlaced nonwoven fabrics, short-fiber nonwoven fabrics such as papermaking, spunbond nonwoven fabrics, and long-fiber nonwoven fabrics such as meltblown nonwoven fabrics.

The fibers constituting the cloth preferably contain synthetic fibers at least in part because the evaluation method of the present invention is useful for evaluation. Synthetic fibers include filament yarns, spun yarns, composite yarns, and the like. Filament yarns include drawn yarns and various twisted yarns. The type of twisted yarn is not particularly limited, and includes, for example, false twisted textured yarn, false twisted fusing yarn, medium hard twisted yarn, and the like.

The synthetic fiber material is not particularly limited. Examples include polymers such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polytrimethylene terephthalate, polypropylene, polyolefin, polycarbonate, polyacrylate, polyamide, polylactic acid, polyurethane, polyphenylene sulfide, and copolymers thereof. These materials contain inorganic substances such as titanium oxide, silica, and barium oxide, carbon black, colorants such as dyes and pigments, flame retardants, fluorescent brighteners, antioxidants, and various additives such as UV absorbers. may contain.

In addition to circular cross-sections, fiber cross-sections include flat cross-sections, polygonal cross-sections such as triangles, quadrilaterals, hexagons, and octagons, daruma cross-sections with uneven portions, Y-shaped cross-sections, and star-shaped cross-sections. It can have various cross-sectional shapes such as, and is not particularly limited.

The fabric may be dyed. Evaluation of the dyed fabric is a preferred mode in that it is in a state close to the actual textile product. The dyeing method is not particularly limited, and examples thereof include scouring, relaxing, heat setting, dyeing, weight reduction, and functional processing. The functional finishing may be water repellent, antistatic, flame retardant, hygroscopic, antistatic, antibacterial, deodorant, soft finish, or other known functional finishing, if necessary.

The evaluation method of the cloth of the present invention is to collect fiber waste generated from the cloth by washing and evaluate its weight. In the case of measuring the weight of fiber waste, a method of measuring the weight change of cloth before and after washing, a method of measuring the weight of fiber waste generated by washing, and the like can be considered. At this time, since the water-soluble substance may adhere to the cloth to be washed, the reproducibility of the weight is low and it is difficult to obtain a proper evaluation. In the present invention, evaluation accuracy can be improved by evaluating the weight of fiber waste generated instead of evaluating the weight change of the cloth. A specific method is as follows.

In the present invention, a cloth whose ends are treated to prevent fiber dust from coming off is used. For example, if the fabric is cut with scissors without anti-shedding treatment, fiber waste may be generated mainly from the cutting part, and it is difficult to accurately measure the amount of fiber waste inherent in the cloth. become. Accurate measurement is preferable because the amount of fiber waste generated in the cloth can be used to estimate the amount of fiber waste generated in textile products such as sewn products using the cloth.

The anti-dropping treatment of fiber waste as used in the present invention is not particularly limited as long as it can prevent the generation of fiber waste during washing according to the present invention within a range that does not impair the effects of the present invention. In that the amount of fiber waste generated can be measured more accurately, as the fiber waste drop-off prevention treatment of the present invention, a cloth whose edges are overlocked is obtained in the same manner as the cloth evaluation method of the present invention. A treatment that is three times or less by weight is preferred. The conditions for overlocking at this time are that polyester filament No. 40 is used as the sewing thread, needle No. 12 is used, the number of stitches is 26/3.0 cm, and the seam allowance is 0.3 cm.

As a specific treatment, for example, any one or a combination of melting cutting treatment, piping treatment, overlocking treatment, adhesive tape treatment, and sealing tape treatment is preferable. The melt cutting process is a process of cutting the thermoplastic fiber while melting it, and includes melt cutting with a heat-type melt cutting cutter, laser, high frequency, and ultrasonic melt cutting. The piping process refers to a process of wrapping the ends of the cloth with a tape-shaped cloth, and the tape-shaped cloth uses a self-fabric or a tape of a highly stretchable elastic member. The overlocking process is a process in which the edges of the fabric are trimmed and the edges are overlocked with looped seams. Adhesive tape treatment refers to a treatment in which a sheet of adhesive is sandwiched between two pieces of cloth whose ends are folded back, and is adhered by heating, pressure bonding, or the like. The welding material is not particularly limited, but is preferably coated with a molten gel-like adhesive resin, a sheet of polyurethane resin, or a sheet of ethylene-vinyl acetate copolymer or the like. can be applied. It is more preferable to apply a sheet-shaped member composed of a single welding material. The thickness of the welding material is preferably 50 μm to 200 μm, particularly for general clothing materials, in that the required welding force and softness are easily balanced. More preferably, it is 100 μm or more, and 150 μm or less is good. If it is difficult to obtain sufficient welding strength, double welding materials can be used.

As means for bonding with the welding material, a method of applying pressure while heating is preferable. For example, a heat iron, a flat plate type heat press, a roller type heat press, a high frequency press, an ultrasonic press, and the like can be applied. More preferably, flat plate presses are suitable for easy control and adjustment of temperature and pressure. In addition, the sealing tape treatment referred to in the present invention is, for example, a tape in which an adhesive or pressure-sensitive adhesive is applied to one side of a waterproof cloth, such as a seam sealer, a seam tape, a waterproof tape, etc. It is a process of attaching to cloth using tape. A hot-melt adhesive is preferable as the adhesive. The flow starting point of the adhesive is preferably 50 to 130°C. By setting the flow starting point to 130° C. or lower, the adhesive can be melted with a small amount of heat and for a short period of time, and the adhesion process can be performed smoothly. In addition, a small amount of heat is preferable because it can suppress the damage given to the cloth to be evaluated and suppress the generation of fiber scraps due to the damage. Furthermore, it is preferable to set the flow starting point to 50° C. or higher because it is possible to suppress peeling of the tape during washing. As a method of attaching to the cloth, a method in which pressure can be applied while heating can be applied. For example, a heat iron, a flat plate-type heat press, a roller-type heat press, a high-frequency press, an ultrasonic press, and the like can be preferably applied. More preferably, it is a flat plate type press that facilitates control and adjustment of temperature and pressure.

By applying one or more of these treatments, it is possible to prevent exposure of the cut portion of the cloth during washing, and to suppress the generation of frayed fibers and falling fiber scraps. A more preferable treatment for preventing fiber waste from coming off is sealing tape treatment. Since fiber dust can come off from both the front and back sides of the cloth, it is preferable to apply the sealing tape so as to cover both the front and back sides of the edge of the cloth. It is possible to cover by folding back with one piece of sealing tape, but due to the repulsion of the folded sealing tape, it may not be adhered and the treatment to prevent fiber scraps from falling off may be insufficient, so use two sealing tapes. It is more preferable to attach them so as to sandwich them. Also, the method of sandwiching between two sheets of sealing tape is simple, has good workability, and is preferable in terms of less error caused by the operator.

The portion treated to prevent the fall of fiber dust is harder than the untreated portion, and physical damage may occur due to the portion treated to prevent the fall of fiber dust during evaluation. Therefore, it is preferable that the anti-dropping treatment of fiber waste is performed within a range of 5.0 cm or less from the end of the cloth, and more preferably within 2.5 cm. The lower limit is not particularly limited, and for example, even if the thickness is less than 0.1 cm in the melt cutting process, it is possible to prevent fiber waste from falling off from the edge of the cloth, but in the case of other processes, it is usually 0.1 cm or more.

In addition, the cloth that has been subjected to anti-dropping treatment of fiber dusts may be post-treated by washing, air blowing or air suction, depending on the purpose of evaluation. When these post-treatments are carried out, the adhering foreign substances can be removed in advance, so that the measurement can be performed with high accuracy.

The effective evaluation area of the cloth as used in the present invention refers to the area of one of the areas of the cloth excluding the area treated to prevent the fibers from coming off from the area of the cloth. If the front and back have different areas, the smaller area is used. In order to measure the weight of fiber waste, the effective evaluation area is preferably 30 cm ² or more, more preferably 100 cm ² or more, from the viewpoint of measurement accuracy. Further, in order to suppress error in the amount of actual fiber waste generated due to reattachment of fiber waste, it is preferably 70000 cm ² or less, more preferably 9000 cm ² or less.

In the evaluation method of the present invention, the washing method is not particularly limited, and a rounder meter used in a washing fastness test (ISO 105-C06 (2006)) or a washing machine, for example, ISO 6330 (2012). A washing machine can be used. Here, the rounder meter only rotates in one direction and can be used for simple evaluation, but it is different from actual washing. In order to more accurately evaluate the generation of fiber waste by washing, it is preferable to use a washing machine defined in ISO 6330 (2012). Washing machines come in a wide variety of types and shapes, and each of them has a different physical action (washing machine force) applied to an article to be washed during washing. Among them, the washing machine specified in ISO 6330 (2012) has basic functions among various washing machines used in general households, and is suitable for the method of evaluating cloth in the present invention. . ISO 6330 (2012) specifies A-type washing machine, B-type washing machine, and C-type washing machine, and any of them can be used in the present invention. Among them, the A-type standard washing machine or the C-type standard washing machine, which is actually used in many countries at home, can be preferably used in the evaluation method of the present invention. Furthermore, a C-type standard washing machine can be used more preferably because it uses a large amount of water during washing and can suppress re-adhesion of fallen fiber waste to the laundry to be washed and more accurately measure fiber waste.

When using the above-mentioned washing machine specified in ISO 6330 (2012), washing is preferably performed under the conditions specified in ISO 6330 (2012). Several kinds of washing conditions are defined for each washing machine, and any of them can be adopted in the present invention. For example, 13 types of washing methods are defined for the A-type standard washing machine and 7 types for the C-type standard washing machine preferably used in the present invention. Among these, as the washing conditions in the present invention, the 4N method and 4M method for the A-type standard washing machine are used because the reproducibility of the amount of fiber waste generated from the cloth is high and it is suitable for evaluating the amount of fiber waste generated. , 3N method, 3M method, 4N method, 4M method, 3N method and 3M method for C-type standard washing machine, and more preferably 4N method for C-type standard washing machine. In general, when the washing machine force due to the washing machine or washing conditions is too weak, it is difficult to generate fiber waste, and the proportion of relatively large yarns etc. that accidentally adhere to the collected fiber waste becomes relatively large, which leads to accurate evaluation. tends to be difficult. Conversely, if the washing machine force is too strong, the cloth will be damaged and waste other than fiber waste will be generated by washing, which also tends to make accurate evaluation difficult. The preferred washing machine and washing conditions of the present invention described above facilitate the efficient generation and evaluation of latent lint that may be generated when the cloth is washed.

In the present invention, fiber waste generated by washing is collected by a collector, but the method of collection by the collector is not particularly limited, and can be appropriately changed according to the washing method employed. In the case of using a washing machine, which is the preferred washing method of the present invention, it is preferable to attach the collector to a drain port such as a drain hose of the washing machine. In this case, the wastewater generated by washing can be directly collected, so that measurement can be performed simply and accurately, which is a preferred embodiment of the present invention.

Moreover, as the collector, a material having openings such as an adsorbent or a net is preferable. In the case of the method using a washing machine, the opening is preferably 5 to 20 μm. By setting the thickness to 5 μm or more, when a washing machine is used in the washing process, the drainage speed does not decrease and fiber waste is less likely to remain in the washing machine, and the generated fiber waste is collected to improve reproducibility. can be evaluated well. Moreover, it is preferable that the mesh size is 20 μm or less in order to collect fiber waste. From the point of balance of these, it is more preferable that the thickness is 9 μm or more. Moreover, it is more preferably 15 μm or less, and even more preferably 12 μm or less. In the present invention, the opening can be obtained by measuring 10 points in units of μm with a 500-fold microscope and rounding off the average value to the first decimal place. If the aperture is circular, measure the maximum diameter. In the case of a square shape, measure either the longitude or the longitude. In addition, if the washing machine has a built-in filter, it will affect the amount of collection, so remove it.

Moreover, the shape of the collector used in the present invention is not particularly limited and may be sheet-like, bag-like, box-like, or the like, and preferably has a structure that has the above-mentioned openings and allows water to escape. Specific examples thereof include metal meshes, perforated metal sheets, perforated films, nonwoven fabrics, woven fabrics, and knitted fabrics. More preferably, woven fabrics are preferred because of their versatility, drainage properties, excellent trapping ability, and high reproducibility. Available.

The collector material may be either metal or plastic. The plastic is not particularly limited. Examples include polymers such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polytrimethylene terephthalate, polypropylene, polyolefin, polycarbonate, polyacrylate, polyamide, polylactic acid, polyurethane, polyphenylene sulfide, and copolymers thereof.

The drainability of the collector used in the present invention is preferably 300 seconds or less. If it is 300 seconds or less, for example, when attached to the drain port of a washing machine, the rate of drainage from the washing machine is suppressed, and the fiber waste can be collected with good reproducibility with little residue in the washing machine. It is more preferably 200 seconds or less, still more preferably 100 seconds or less. Also, the lower limit is not particularly limited, but is substantially 5 seconds or more. The drainage property can be appropriately adjusted by the porosity of the collector, the water absorbency, and the like. When the collector is a fibrous structure, the drainability can also be adjusted by the density, fineness, and structure.

In addition, in the present invention, the drainage property is measured by the following evaluation method.
(a) A circular sheet with a diameter of 20 cm cut from the collector is folded into four and set in a triangular funnel with a diameter of 22 cm. That is, the sheet is folded in half twice, one side of the bag-like shape is opened into a conical shape, and set in a triangular funnel. This is a method similar to the method of folding filter paper into four, although there are different parts such as folding and tearing.
(b) Pour in 300 ml of distilled water, measure the time from when the first drop falls from the funnel to when the last drop falls from the funnel, and determine the drainability.
(c) The last drop is determined to be the last drop if the next drop does not fall for 5 minutes or more.

Such a collector is not special, and may be appropriately selected from commercially available sheets and the like. A specific example is “Nylon Screen” NY10-HC (purchased from Flon Kogyo Co., Ltd.).

In a preferred embodiment of the method for evaluating the fabric of the present invention, a cloth treated to prevent falling off of fiber waste is put into the washing machine with a collector attached to the discharge port of the washing machine, and This is a method of washing under the above washing conditions. After washing, the weight of fiber scraps adhering to a collector such as the above-mentioned "nylon screen" (purchased from Flon Kogyo Co., Ltd.) is measured.

Detergent may affect the amount of fiber waste generated and reduce reproducibility, so it is preferable to use the amount less than the amount specified in JIS L1930 (2014) or ISO 6330 (2012), etc., and more preferably wash without adding detergent. conduct. When adding detergent, it is necessary to consider the insoluble content of the detergent. Moreover, it is preferable not to use the load cloth because the load cloth also generates fiber waste.

As a method for measuring the weight of the fiber waste collected by the collector, there is a method of measuring the weight after drying the collector, or a method of washing off the fiber waste from the collector using pure water, and then measuring the opening of the mesh to 0.5 mm. There is no particular limitation, such as a method of filtering through a filter of 1 to 20 μm and recovering. The method of drying the collector and weighing it is preferable because it is simple and less prone to operational errors. The method of recovering by filtration is preferable because errors do not occur due to changes in the weight of the collector due to moisture absorption and desorption of the collector, outflow of the collector material, and the like. In this case, the mesh size of the filter is made smaller than that of the collector in order to collect the fibers collected by the collector. A specific example of the method of filtering and recovering is shown below. Suction filtration is performed using a filter, for example, a polycarbonate membrane (“K040A047A” manufactured by Advantec Toyo Co., Ltd.) whose weight has been measured after absolute drying. The filter after filtration and the fiber waste are dried at 105° C. for 1 hour, and the weight is measured, and the difference between the weight before filtration is taken as the weight of the fiber waste. After heating at 105° C. for 1 hour, the temperature and humidity are controlled at 20° C. and 65% RH, and then the weight is measured.

The method for evaluating the fabric of the present invention will be specifically described below with reference to examples.

(1) Drainability (a) A circular sheet with a diameter of 20 cm cut from the collector was folded into four and set in a triangular funnel with a diameter of 22 cm.
(b) 300 ml of distilled water was poured, and the time from when the first drop fell from the funnel to when the last drop fell from the funnel was measured, and the drainability was determined.
(c) The last drop was judged to be the last drop if the next drop did not drop for more than 5 minutes.

(2) Opening Using a digital microscope "VHX-7000" (manufactured by KEYENCE CORPORATION), the surface of the collector was photographed at a magnification of 500 times, and 10 openings were measured in units of μm. The average value of the obtained values was rounded off to the first decimal place and used as the opening value. If the holes were round, the largest diameter was measured; if the holes were square, whichever was longer.

(3) Weight measurement of fiber waste A polycarbonate membrane (“K040A047A”, pore size 0.4 μm, manufactured by Advantec Toyo Co., Ltd.) weighed in advance was used to suction-filter an aqueous solution containing fiber waste. After drying the filtered polycarbonate membrane and fiber scraps at 105° C. for 1 hour, their weights were measured, and the difference between the weights before filtration was taken as the weight of the fiber scraps.

(4) Effective evaluation area The length of each side was obtained by rounding off to the first decimal place in cm units. The width of the fiber fall-off prevention treatment was similarly obtained, and less than 0.05 cm was taken as 0 cm. The effective evaluation area of the fabric, excluding the area treated to prevent fiber dropout, was rounded to the nearest whole number.

[Fabric production example 1]
Acrylic/rayon spun yarn (metric count: 1/64) is used for the knitted loop made of inelastic fibers, and polyester fiber (84 dtex-72F) and polyurethane elastic fiber (33 dtex) are used for the knitted loop made of inelastic fibers and elastic fibers. A 1:1 interwoven fabric was produced using a tenjiku fabric. The material mix ratio is 28% acrylic/34% rayon, 33% polyester, and 5% polyurethane. The obtained gray fabric was processed according to the usual dyeing processing conditions for circular knitted fabrics to obtain knitted fabrics.

[Fabric Production Example 2]
Using a single circular knitting machine, a polyester fiber (66 dtex-96F) was used as the non-elastic fiber, and a polyurethane fiber (22 dtex) was used as the elastic fiber to produce a circular knitted fabric with a jersey structure. The blend ratio of the material is 90% polyester and 10% polyurethane. The obtained gray fabric was processed according to the usual dyeing processing conditions for circular knitted fabrics to obtain knitted fabrics.

[Example 1]
Cut the knitted fabric obtained in Production Example 1 into a square with a length of 32.0 cm and a width of 32.0 cm. Temporary adhesion was carried out in a state in which half of the sealing tape protruded in the range of 1.0 cm. After temporarily adhering the four sides, a sealing tape was similarly adhered from the opposite side, and the edge of the cloth was sandwiched between the two sealing tapes. The adhesive portion of the sealing tape and the edge of the cloth was sewn to the sewing thread by a lockstitch sewing machine (using polyester filament for the sewing thread, the number of needle movements: 13 stitches/3.0 cm) so as not to come off. Furthermore, using an air-driven fully automatic transfer press "HP-4536A-12" (manufactured by Hashima Co., Ltd.), press at 0.6 MPa, 130 ° C. for 5 seconds to perform final adhesion, test piece (effective evaluation area : 900 cm ² ).

A C-type reference washing machine described in ISO 6330 (2012) was used. First, for washing the washing machine, using "AQW-V700E 7 kg" (manufactured by Aqua Co., Ltd.) according to the ISO 6330 (2012) C4N method, rinsing and draining were performed twice without putting the laundry. Specifically, the course was carefully set, the amount of water was 40 L, the washing time was 15 minutes, the rinsing was twice, and the dehydration was 7 minutes. Next, a “nylon screen” NY10-HC (manufactured by Flon Kogyo Co., Ltd.) having an opening of 11.3 μm and a drainability of 82 seconds was attached to the drain hose of the washing machine. After that, the two test pieces were placed in a washing machine and washed under the washing conditions of the ISO 6330 C4N method. However, detergent and load cloth were not used. After washing, the fiber waste adhering to the above "nylon screen" was suction-filtered using a pre-weighed polycarbonate membrane ("K040A047A" manufactured by Advantec Toyo Co., Ltd.). The filtered polycarbonate membrane and fiber waste were dried at 105° C. for 1 hour and weighed. The weight of the obtained fiber waste was 8.7 mg.

[Example 2]
The cloth obtained in Production Example 1 is fused and cut into squares of 30.0 cm vertically and 30.0 cm horizontally using a variable-arm ultrasonic sewing machine “LWU-3015-4” (manufactured by Quinlight Denshi Seiko Co., Ltd.). The test was performed in the same manner as in Example 1, except that a test piece (effective evaluation area: 900 cm ² ) was prepared. The weight of the fluff was 26.0 mg.

[Example 3]
The cloth obtained in Production Example 1 is sewn using an overlock sewing machine "M852-16S2" (manufactured by Pegasus Sewing Machine Mfg. Co., Ltd.) using polyester filament No. 40 and needle No. 12, and the number of stitches is 26/ The test was performed in the same manner as in Example 1 except that a square test piece (effective evaluation area: 900 cm ² ) of 30.6 cm long and 30.6 cm wide was prepared with a seam allowance of 0.3 cm. The weight of the fluff was 10.2 mg.

[Example 4]
Cut the cloth obtained in Production Example 1 into a square with a length of 32.0 cm and a width of 32.0 cm with scissors. : 900 cm ² ) was prepared in the same manner as in Example 1. The weight of the fluff was 25.6 mg.

[Example 5]
Cut the cloth obtained in Production Example 1 into a square with a length of 34.0 cm and a width of 34.0 cm with scissors. ) was temporarily adhered, and after trimming, the temporarily adhered adhesive tape was folded back inward and permanently adhered to create a test piece (effective evaluation area: 900 cm ² ). gone. The weight of the fluff was 6.1 mg. In the above-described test piece, the adhesive of the adhesive tape permeates into the fabric, fixing the fiber structure in the fabric at the bonded portion, so that the fiber dust fall-off prevention treatment is performed.

[Comparative Example 1]
Tests were carried out in the same manner as in Example 1, except that the cloth obtained in Production Example 1 was cut into a square with a length of 30.0 cm and a width of 30.0 cm with scissors to prepare a test piece (effective evaluation area: 900 cm ² ). did The weight of the fluff was 42.4 mg.

[Examples 6 to 10]
The tests were conducted in the same manner as in Examples 1 to 5, except that the cloth obtained in Production Example 2 was used. The weight of the fluff was 5.6 mg for Example 6, 15.2 mg for Example 7, 7.8 mg for Example 8, 21.4 mg for Example 9, and 2.9 mg for Example 10.

[Comparative Example 2]
A test was conducted in the same manner as in Comparative Example 1 except that the cloth obtained in Production Example 2 was used. The weight of the fluff was 35.7 mg.

Claims (10)

A step of washing the cloth whose ends are treated to prevent the falling of fiber scraps,
a step of collecting fiber waste generated by the washing step with a collector;
measuring the weight of the collected fiber waste;
A method of evaluating fabrics, including In the step of performing the washing step using a washing machine and collecting fiber waste generated by the washing step with a collector, the collector is attached to a drain port of the washing machine, and the fiber waste is discharged from the washing machine. 2. The method for evaluating a cloth according to claim 1, wherein the cloth is collected from wastewater flowing from the mouth. 3. The fabric evaluation method according to claim 1 or 2, wherein the anti-dropping treatment of fiber waste is any one of melt cutting treatment, piping treatment, overlock treatment, adhesive tape treatment, and sealing tape treatment. The fabric evaluation method according to any one of claims 1 to 3, wherein the treatment for preventing the falling off of fiber scraps is a process of adhering the fabric so that the ends of the fabric are sandwiched between two sealing tapes. The fabric evaluation method according to any one of claims 1 to 4, wherein the fiber dust drop-off prevention treatment is applied in a range of 5.0 cm or less from the edge of the fabric. The method for evaluating cloth according to any one of claims 1 to 5, wherein the cloth has an effective evaluation area of 30 to 70000 cm ² . The fabric evaluation method according to any one of claims 1 to 6, wherein the collector has an opening of 5 to 20 µm. The fabric evaluation method according to any one of claims 1 to 7, wherein the collector has a drainability of 300 seconds or less measured in the following order.
Drainage measurement procedure (a) A circular sheet with a diameter of 20 cm cut from the collector is folded into four and set in a triangular funnel with a diameter of 22 cm.
(b) Pour in 300 ml of distilled water, measure the time from when the first drop falls from the funnel to when the last drop falls from the funnel, and determine the drainability.
(c) The last drop is determined to be the last drop if the next drop does not fall for 5 minutes or more. The fabric evaluation method according to any one of claims 1 to 8, wherein the washing step is performed using a washing machine and washing conditions specified in ISO 6330 (2012). The fabric evaluation method according to any one of claims 1 to 9, wherein the washing step is performed using a C-type standard washing machine and 4N method conditions specified in ISO 6330 (2012).