JP6515715B2 - A erosion-treated woven or knitted fabric containing a modified polyester fiber and a method for producing the same - Google Patents

Description

  The present invention relates to a erosion-treated woven or knitted fabric comprising a highly removable polyester fiber and a method for producing the same.

  In the past, in a woven and knitted fabric consisting of two or more fibers of highly removable fibers and fibers that are difficult to be ejected, an erosion paste is printed in the form of a handle, and removal processing is performed to embrittle the highly removable fibers. Also known as opal processing, it is widely known. The chemical reaction in the erosion process varies depending on the type of fiber. For example, a method of removing polyester fibers is also called alkali reduction, and is alkaline hydrolysis using sodium hydroxide or potassium hydroxide. On the other hand, acid hydrolysis and carbonization, dissolution with a thermal organic solvent, and the like are used to remove cellulosic fibers such as cotton and acetate.

[Prior art]
As a removal process, a removal paste is printed as a pattern on a woven or knitted fabric composed of a highly removable polyester fiber and a low removable polyester fiber, and the highly modified polyester fiber is removed It is well-known that a method of printing and heat-treating a paste solution containing sodium hydroxide or potassium hydroxide as a scraping agent is known.

  However, the method using sodium hydroxide or potassium hydroxide, which is used in the extraction process utilizing the difference between the hydrolyzability of the highly removable polyester fiber and the lowly extracted unmodified polyester fiber, has not been used. Even a modified polyester fiber may be embrittled, and there is a problem that the strength is lowered and the poor corrosion is caused. In addition, sodium hydroxide and potassium hydroxide are strongly alkaline substances, so they are highly toxic and irritating to humans, and have a high impact on the aqueous environment.

  According to Patent Document 1 (Japanese Patent Application Laid-Open No. 2000-096439), in a process of removing a modified polyester fiber from a woven or knitted fabric in which the fabric comprises a modified polyester fiber and an unmodified polyester fiber, It has been proposed to use a carious process. However, although the removal property of the modified polyester is good in the removal processing with guanidine carbonate, there is a problem that the non-modified polyester is embrittled and strength is reduced.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2000-282377) discloses a quaternary ammonium salt for removing a modified polyester fiber from a woven or knitted fabric having a normal pressure cationic dyeable polyester fiber as an essential component. A method has been proposed in which the paste solution containing the ink is printed and heat treatment is followed by alkali reduction to remove the modified polyester fiber. However, there is a problem that the strength of the modified polyester fiber and the non-modified polyester fiber can not be maintained since alkali reduction processing using sodium hydroxide is performed.

  Patent Document 3 (Japanese Patent Laid-Open No. 2008-038332) discloses at least guanidine carbonate, caustic soda and caustic potash by ink jet printing in the process of removing modified polyester fibers from a woven or knitted fabric in which the fabric comprises modified polyester fibers and unmodified polyester fibers. It has been proposed to carry out the erosion process by depositing one of the scraping agents. Although the removal processing is performed by controlling the adhesion amount of the removal processing agent by ink jet printing, in order to maintain the strength of the unmodified polyester fiber, the fineness of the unmodified polyester fiber is increased or the core portion Although a composite yarn of unmodified polyester fiber and modified polyester fiber in the sheath part is used to attach the erosion-finishing agent only to the modified polyester fiber, in any case, the embrittlement of the unmodified polyester fiber is There is a problem that it can not prevent.

  According to Patent Document 4 (WO 2007/086593), a fabric to be subjected to a removal process is composed of an inelastic fiber and an elastic fiber, and a non-elastic fiber is a cationic dyeable polyester fiber which is an extractable fiber. And nylon fiber, which is non-erodible fiber, and ether polyurethane fiber is used as elastic fiber, and sodium hydroxide is used as a decoloring agent. Some cationic dyed polyester fibers and polyurethane fibers are removed and there is a problem that the strength is reduced.

Japanese Patent Laid-Open No. 2000-096439 Unexamined-Japanese-Patent No. 2000-282377 JP, 2008-038332, A WO 2007/086593 pamphlet

  As described above, in the removal process for removing modified polyester fibers, sufficient removal is not performed unless it is a strong alkali, and when a strong alkali is used, there is a problem that the strength of the removed fabric decreases. In view of this situation, the present invention uses a modified polyester fiber having sufficient removal performance, makes it easy to perform removal even with weak alkali, and reduces the strength of fibers other than the removed part including unmodified polyester fiber. It is an object of the present invention to provide a highly removable dental erosion-processed woven or knitted fabric which can be avoided.

  In the prior art, in order to prevent the embrittlement of unmodified polyester fibers in the process of removing the woven or knitted fabric of modified polyester fibers and unmodified polyester fibers, strongly alkaline substances such as sodium hydroxide and potassium hydroxide are used as the paste to be removed. It has been studied to heat-treat the alkali weight loss promoter without using it and to promote alkali weight loss in the printing area at the time of alkali weight reduction after the heat treatment. However, the inventors focused on further modification of the modified polyester fiber, and the modified polyester fiber does not use a strongly alkaline substance such as sodium hydroxide or potassium hydroxide, and unmodified polyester fiber or polyurethane fiber It has been found that alkali reduction can be performed only at a specific pH range of the modified polyester fiber without the influence of strength reduction.

  The woven or knitted fabric according to the present invention is a woven or knitted fabric containing modified polyester fiber and non-weight-loss fiber which loses weight under the condition of pH 8 to 13, and which has a removed portion from which the modified polyester fiber is lost. It is a knitted fabric.

In the woven or knitted fabric of the present invention, the burst strength of the woven or knitted fabric at the removed portion is preferably 250 kPa or more and 900 kPa or less.
The woven or knitted fabric of the present invention preferably has a strength retention of 50% or more of the burst strength of the ejected portion of the woven or knitted fabric relative to the burst strength of the non-extracted portion of the woven or knitted fabric.

  In the woven or knitted fabric according to the present invention, the modified polyester fiber contains ethylene terephthalate as a main constituent unit, 16 mol% to 25 mol% of aliphatic dicarboxylic acid having 4 to 8 carbon atoms, and metal sulfonate group-containing aromatic dicarboxylic acid It is preferable that it is a modified polyester in which 2 to 5 mol% of acid is copolymerized.

In the woven or knitted fabric of the present invention, the non-weight loss fiber preferably contains 50% by mass or more and 95% by mass or less of the synthetic fiber.
In the woven or knitted fabric of the present invention, the synthetic fiber is preferably any one of regular polyester fiber, polyamide fiber, elastic fiber, polyolefin fiber and acrylic fiber.

In the woven or knitted fabric of the present invention, the single fiber fineness of the modified polyester fiber is preferably 0.6 dtex or more and 3.5 dtex or less.
In the woven or knitted fabric according to the present invention, the elastic fiber is preferably made of any of polyurethane fiber, polytrimethylene terephthalate fiber, and polybutylene terephthalate fiber.

  In the method for producing a woven or knitted fabric according to the present invention, a fabric having a modified polyester fiber and a non-weight-reduced fiber whose weight is reduced under the condition of pH 8 to 13 is printed with a discoloring agent and printed with a discoloring agent. The method of producing a woven or knitted fabric in which the superheated steam is applied to the portion to reduce the weight and the pH of the scraping agent is 8 or more and 13 or less, and the heating method is a superheated steam of 150 ° C. or more and 200 ° C. or less It is a method of manufacturing a woven or knitted fabric which has a heating time of 5 minutes to 15 minutes.

  According to the present invention, in the process of removing the woven or knitted fabric containing the modified polyester fiber, the strength of the modified polyester fiber other than the removed portion does not decrease, and the woven or knitted fabric containing the fiber other than the modified polyester fiber It is possible not to cause the strength reduction of the removed portion, and at the same time, it is possible to obtain a good removal effect. According to the present invention, it is possible to obtain a scraped product having good strength without corrosion of the modified polyester fiber.

The woven or knitted fabric according to the present invention is a woven or knitted fabric containing a modified polyester fiber which loses weight under conditions of pH 8 to 13 and a non-weight loss fiber, and the modified polyester fiber has ethylene terephthalate as a main constituent unit, A modified polyester fiber in which 16 to 25 mol% of aliphatic dicarboxylic acid having 4 to 8 carbon atoms and 2 to 5 mol% of metal sulfonate group-containing aromatic dicarboxylic acid are copolymerized, It is a woven or knitted fabric having a removed portion from which a modified polyester fiber is reduced.

  In the woven or knitted fabric of the present invention, if the pH is 8 or more, the amount of the modified polyester can be easily decreased, and if the pH is 13 or less, the embrittlement of non-weight loss fibers can be reduced. The pH is more preferably 9 or more and 12.5 or less, and still more preferably 10 or more and 12 or less from the viewpoint of the removal property.

In the woven or knitted fabric of the present invention, the burst strength of the woven or knitted fabric at the removed portion is preferably 250 kPa or more and 900 kPa or less.
If the said burst strength is 250 kPa or more, it is a strength which does not have a problem in use as a product. In addition, 900 kPa is sufficient strength for use.
From the above viewpoint, the rupture strength is preferably 400 kPa or more, and more preferably 600 kPa or more.

The woven or knitted fabric of the present invention preferably has a strength retention rate of 50% or more of the burst strength of the ejected portion of the woven or knitted fabric relative to the burst strength of the non-extracted portion of the woven or knitted fabric.
When the strength retention rate of the burst strength is 50% or more, it is possible to reduce the breakage of the woven or knitted fabric due to excessive concentration of stress on the portion to be removed.
From the viewpoint, the strength retention rate is more preferably 70% or more, and still more preferably 85% or more.

The modified polyester fiber, if copolymerization amount of the aliphatic dicarboxylic acid having 4 to 8 carbon atoms is 16 mol% or more, likely to be reduced in the range of pH 8 to 13, there in 25 mol% or less For example, yarn breakage during spinning of the fiber can be reduced, and the productivity is improved.
From the above viewpoint, the copolymerization amount of the aliphatic dicarboxylic acid having 4 to 8 carbon atoms is more preferably 20 mol% or less.

In the woven or knitted fabric of the present invention, the non-weight loss fibers preferably contain 50% by mass or more and 95% by mass or less of synthetic fibers.
When the content of the synthetic fiber with respect to the woven or knitted fabric is 50% by mass or more, the decrease in the burst strength of the scraped portion can be reduced. Moreover, if content of the said synthetic fiber is 95 mass% or less, it can contain a caries fiber, and it can be easy to take out the effect of caries processing. From the viewpoint, the content of the synthetic fiber is more preferably 60% by mass to 80% by mass.

In the woven or knitted fabric of the present invention, the synthetic fiber is preferably any one of regular polyester fiber, polyamide fiber, elastic fiber, polyolefin fiber and acrylic fiber.
Among them, regular polyester fibers are preferable in terms of strength, and elastic fibers are preferable in terms of achieving stretchability.

In the woven or knitted fabric of the present invention, the single fiber fineness of the modified polyester fiber is preferably 0.6 dtex or more and 3.5 dtex or less.
If the single fiber fineness is 0.6 dtex or more, the strength of the woven or knitted fabric can be enhanced, and if it is 3.5 dtex or smaller, the peelability becomes good and the texture of the woven or knitted fabric can be softened easily.
From the above viewpoint, the single fiber fineness is more preferably 0.9 dtex or more and 2.5 dtex or less.

  In the woven or knitted fabric according to the present invention, it is preferable that the elastic fiber is any one of polyurethane fiber, polytrimethylene terephthalate fiber and polybutylene terephthalate fiber as described above.

  The woven or knitted fabric of the present invention preferably comprises modified polyester fibers, regular polyester fibers and polyurethane fibers. With the above configuration, it is possible to obtain a woven or knitted fabric having stretchability, high strength and soft texture.

The method for producing a woven or knitted fabric according to the present invention comprises ethylene terephthalate as a main constituent unit and reduces 16 to 25 mol% of an aliphatic dicarboxylic acid having 4 to 8 carbon atoms , which decreases in weight under pH 8 to 13 conditions. A scraping agent is printed on a fabric containing a modified polyester fiber copolymerized with 2 mol% to 5 mol% of a metal sulfonate group-containing aromatic dicarboxylic acid and a non-weight loss fiber, and the scraping agent is printed A method for producing a woven or knitted fabric in which overheated steam is given to a roasted portion to reduce weight, wherein the pH of the scraping agent is 8 or more and 13 or less, and the heating method is overheated steam of 150 ° C. or more and 200 ° C. or less The heating time is 5 minutes or more and 15 minutes or less.

  The said heating method gives the superheated steam of 150 degreeC or more and 200 degrees C or less to the part which printed the erosion processing agent. When the temperature of the superheated steam is 150 ° C. or more, the removal property is good, and when the temperature is 200 ° C. or less, the texture of the polyester fiber can be reduced to be hard.

The heating time is preferably 5 minutes or more and 15 minutes or less.
If the heating time is 5 minutes or more, the carriability will be good, and if it is 15 minutes or less, the strength reduction of the non-eroded portion can be reduced.

  The scraping agent is characterized by containing a sizing agent and a component having a scraping action at a specific pH range (pH 9 or more and 13 or less) excluding guanidine carbonate. As said component which has a removing effect, 1 type or 2 types of sodium carbonate or potassium carbonate are preferable, and 1 type of sodium carbonate is more preferable. The use amount of sodium carbonate or potassium carbonate may be adjusted according to the mass of the modified polyester fiber to be removed, but generally, it is used in the range of 5% by mass to 15% by mass with respect to the removal processing agent Is preferred. The disintegration processing agent may contain a disintegration promoter as needed. There is no particular limitation on the dental caries accelerator, and commercially available ones can be used. For example, Meisei Chemical Co., Ltd. make, May printer OP-2 is preferable.

As the sizing agent contained in the caries finishing agent, natural, processed, such as locust bean gum type, starch type, dextrin type, crystal gum type, tragant gum type, cellulose type, carboxymethyl cellulose, polyvinyl alcohol, sodium polyacrylate, etc. Semi-synthetic and synthetic pastes may be used alone or in combination of two or more. The proportion of the sizing agent is not particularly limited as long as an appropriate viscosity can be maintained to print the scraping agent and carry out heat treatment, but it is contained, for example, at 1% by mass to 10% by mass with respect to the scraping agent Is preferred.
In addition, other compounds such as a dye can also be added to the scraping agent.

Description will be made of a method of removing by using the above-described removing agent.
The above-mentioned scraping agent is preferably applied to a woven or knitted fabric containing a modified polyester fiber.
The fiber used in combination with the modified polyester fiber is not particularly limited as long as it is a fiber having a non-weight reducing property different from that of the modified polyester fiber, for example, unmodified polyester fiber (consisting of unmodified polyethylene terephthalate, regular polyester fiber Polyamide fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polypropylene fiber, polyethylene fiber, polyurethane fiber and the like can be used. A discharge process is performed on a woven or knitted fabric composed of yarns, staple yarns and the like in which the modified polyester fibers and these fibers are combined by any method such as blending, mixing, and twisting. The woven and knitted fabric may use a dyed fabric as required. For dyeing, all or part of the fabric is dyed or printed by any known method.

  The removal process can be carried out using the above-described removal process agent in accordance with generally known steps of printing, heat treatment and cleaning. In the printing step, the scraping agent is printed in a shape according to the desired pattern on the woven or knitted fabric containing the modified polyester fiber. A printing method, a spray method, etc. are used for the printing of the scraping agent. The printing method is not particularly limited, and a mold printing method, a flat screen method, a rotary screen method, a roller method and the like are used. The adhesion amount of the removing agent to the woven or knitted fabric can be optionally determined according to the method of printing, the woven / knitted structure of the fabric, and the desired pattern.

  For example, in the case of the flat screen method, the viscosity of a scraping agent, the hardness of a rubber squeegee, and printing of a scraping agent is performed by a woven or knitted structure to be imprinted, or a mesh of a formwork to print a desired pattern. The rubber squeegee pressure, the squeegee printing speed are determined, and the fabric is uniformly applied with a scraping agent in a desired pattern. As confirmation of whether it adheres uniformly to the fabric, there is no blurring of the printing part visually, there is no difference in the pattern on the left and right of the rubber squeegee, or the scraping agent uniformly penetrates the back of the printing part. It does by confirming whether it is. Moreover, you may print the shape according to a desired pattern with the dyeing paste which does not contain a erosion processing agent in parts other than the adhesion part of a erosion processing agent. The printing method of the dyeing paste is not particularly limited, and printing is performed in the same manner as the removal processing agent. After printing a scraping agent and a dyeing paste on a woven or knitted fabric, it is suitably dried and then heat-treated.

  As the heat treatment method, a baking method, a steam method, an HT steam method and the like can be mentioned, and the HT steam method is more preferable.

  After the heat treatment step, removal of the embrittled modified polyester fiber in the printing part, removal of non-fixed dye to the fiber of dye used in combination with the discoloring agent, dyeing paste used other than the adhering part of the discoloring agent And washing of unpasted dye, etc. on fibers. It does not specifically limit as a washing | cleaning method, It wash | cleans by a well-known process. For example, washing with surfactant 2 g / L, alkaline washing with surfactant 2 g / L, soda ash 2 g / L, acidic washing with surfactant 2 g / L, acetic acid (90%) 2 g / L, interface Alkali reduction washing with activator 2 g / L, soda ash 2 g / L, hydrosulfite or thiourea dioxide 2 g / L, surfactant 2 g / L, acetic acid (90%) 2 g / L, Rongalite 4 g / L There is an acid reduction wash. The washing temperature is preferably 60 ° C. or more and 100 ° C. or less, and the washing time is preferably 5 minutes or more and 30 minutes or less. Thereafter, washing with water, dehydration and drying are performed.

  As surfactant used for washing | cleaning, nonionic surfactant, anionic surfactant, cationic surfactant, and amphoteric surfactant are mentioned, These can be used individually or in mixture of 2 or more types.

  Nonionic surfactants include non-ether type non-ether surfactants such as higher alcohol alkylene oxide adducts, alkyl phenol alkylene oxide adducts, styrenated alkyl phenol alkylene oxide adducts, styrenated phenol alkylene oxide adducts, higher alkyl amine alkylene oxide adducts and the like Ion surfactants; Ether ester type nonionic surfactants such as fatty acid alkylene oxide adducts, polyhydric alcohol fatty acid ester alkylene oxide adducts, fatty acid amide alkylene oxide adducts, alkylene oxide adducts of fats and oils, etc .; polypropylene glycol ethylene oxide Polyalkylene glycol type nonionic surfactants such as adducts; fatty acid esters of glycerol, fats of pentaerythritol Ester type nonionic surfactants such as acid esters, fatty acid esters of sorbitol, fatty acid esters of sorbitan, fatty acid esters of sucrose; other nonionic surfactants such as alkyl ethers of polyhydric alcohols and fatty acid amides of alkanolamines Agents can be mentioned. Examples of the alkylene oxide include ethylene oxide, propylene oxide and butylene oxide. The addition form of the alkylene oxide may be two or more kinds of random addition or block addition.

  As anionic surfactant, anionic surfactant of carboxylic acid salt such as fatty acid soap; higher alcohol sulfuric acid ester salt, higher alcohol alkylene oxide adduct sulfuric acid ester salt, polyoxyalkylene ether sulfuric acid ester salt, phenol alkylene oxide adduct sulfuric acid Ester salt, alkylphenol alkylene oxide adduct sulfate ester salt, styrenated alkylphenol alkylene oxide adduct sulfate ester salt, styrenated phenol alkylene oxide adduct sulfate ester salt, polyhydric alcohol alkylene oxide adduct sulfate ester salt, sulfated oil, sulfuric acid Sulfated fatty acid ester, sulfated fatty acid, sulfated ester salt such as sulfated olefin; alkyl benzene sulfonate, alkyl naphthalene sulfonate, naphthalene Anionic surfactants of sulfonic acid ester salts such as formalin condensates such as rufonic acid, α-olefin sulfonates, paraffin sulfonates and sulfonates such as sulfosuccinic acid diester salts; oleoyl methyl taurine sodium salt, higher alcohol Phosphoric acid ester salt, polyoxyalkylene ether phosphoric acid ester salt, phenol alkylene oxide adduct phosphoric acid ester salt, alkylphenol alkylene oxide adduct phosphoric acid ester salt, styrenated alkyl phenol alkylene oxide adduct phosphoric acid ester salt, styrenated phenol alkylene Oxide adduct phosphate ester salt, polyhydric alcohol alkylene oxide adduct phosphate ester salt and other phosphate ester salts; N-methyl taurine oleate, N-methyl ta Other anionic surfactants such as urin stearate are included. Examples of the alkylene oxide include ethylene oxide, propylene oxide and butylene oxide. The addition form of the alkylene oxide may be two or more kinds of random addition or block addition. As salts, alkali metal salts such as lithium, sodium and potassium; primary amines such as ammonia, methylamine, ethylamine, propylamine, butylamine and allylamine; dimethylamine, diethylamine, dipropylamine, dibutylamine and diarylamine 2 Examples include secondary amines; tertiary amines such as trimethylamine, triethylamine, tripropylamine and tributylamine; and amine salts such as alkanolamines such as monoethanolamine, diethanolamine and triethanolamine.

  Examples of cationic surfactants include alkyl ether quaternary ammonium salts, alkyl amide quaternary ammonium salts, dialkyl ester quaternary ammonium salts, dialkyl imidazoline quaternary ammonium salts, alkylamidoamines, alkylether amines, alkylamidoguanidines, and arginine derivatives. be able to.

  Examples of amphoteric surfactants include alkyl betaine surfactants, amidopropyl betaine surfactants, imidazolinium betaine surfactants and the like.

  According to the above processing method, it is possible to obtain a scraped product in which the modified polyester fiber of the portion printed with the scraping agent has fallen off. The resulting scraped product is subjected to known processing such as dyeing and finishing as required.

EXAMPLES Hereinafter, the present invention will be more specifically described by way of examples, but the present invention is not limited to these examples.
(Alkali weight loss rate)
From the weight of the cloth before and after the treatment, the weight loss rate (%) was determined by the following equation.
Weight loss rate (%) = [(mass of original fabric-mass of treated fabric) / mass of original fabric] × 100
(Burst strength)
It measured according to the Murren method of JIS L 1018.
(Burst strength retention rate)
Burst strength retention rate = Burst strength of the removed part after removal of the woven or knitted fabric / Burst strength of non-removed part after removal of the woven or woven material × 100 (%)

Example 1
Treated cloth:
Knitted with 48 filaments of a modified polyester fiber consisting mainly of ethylene terephthalate and consisting of a polyester resin copolymerized with 16 mol% of adipic acid and 2.5 mol% of 5-sodium isophthalic acid A weft knit of tissue was made.
Using a mini color dyeing machine (multicolor rotary pot dyeing tester manufactured by Texam Giken Co., Ltd.), the weft knitted fabric is made of sodium carbonate 40 g / L, the ratio of the mass of the weft knitted fabric to the mass of the sodium carbonate aqueous solution The aqueous solution was subjected to alkali weight reduction processing at 100 ° C. for 30 minutes, washed with water, dehydrated and dried to obtain a processed knitted fabric.
The pH of the aqueous solution was 11.8.
The weight loss rates are shown in Table 1.

Comparative Example 1
The yarn used for the weft knitted fabric is composed of a polyester resin comprising ethylene terephthalate as the main constituent unit, and containing 5 mol% of adipic acid and 2.3 mol% of 5-sodiumisophthalic acid, having a fineness of 84 dtex and 48 filaments A processed knitted fabric was obtained in the same manner as in Example 1 except that cationic dyed polyester fibers were used.
Table 1 shows the weight loss rate. Compared to Example 1, the weight loss rate was 1/3.

Comparative Example 2
The yarn used for the weft knitted fabric is composed of polyethylene terephthalate fiber (consisting of unmodified polyethylene terephthalate, hereinafter also referred to as "regular polyester fiber") (manufactured by Teijin Ltd.), denier 84 dtex, 36 A processed knitted fabric was obtained in the same manner as in Example 1 except that a filament was used.
Table 1 shows the weight loss rate. The weight loss rate of the knitted fabric of Comparative Example 2 was 0%.

Example 2
Treated cloth:
Using the weft knitted fabric prepared in Example 1 and using a mini color dyeing machine (multicolor rotary pot dyeing tester manufactured by Texam Giken Co., Ltd.), 40 g / L of potassium carbonate, the mass of the weft knitted fabric and After the alkali reduction was performed at a ratio of 1:20 to the mass of the aqueous solution of sodium carbonate and the aqueous solution temperature of 100 ° C. for 30 minutes, the reduction in weight was carried out by washing with water, dehydration and drying.
The pH of the aqueous solution was 11.8.
The weight loss rates are shown in Table 1.

Comparative Example 3
A processed knitted fabric was obtained in the same manner as in Example 2 except that the weft knitted fabric used in Comparative Example 1 was used.
The pH of the aqueous solution was 11.8.
The weight loss rates are shown in Table 1. Compared to Example 2, the weight loss rate was 1/4.

Comparative Example 4
A processed knitted fabric was obtained in the same manner as in Example 2 except that the flat knitted fabric used in Comparative Example 2 was used.
The pH of the aqueous solution was 11.8.
The weight loss rates are shown in Table 1. The weight loss rate of the knitted fabric of Comparative Example 4 was 0%.

[Example 3]
Caustic soda (50%) 20 g / L, using the weft knitted fabric prepared in Example 1 and using a mini color dyeing machine (multicolor rotary pot dyeing tester manufactured by Texam Giken Co., Ltd.), said weft knitted fabric The alkali weight loss was carried out at a ratio of the weight of sodium hydroxide to the weight of caustic soda at 1:20 and the aqueous solution temperature at 100 ° C. for 30 minutes, followed by weight loss processing such as washing with water, dehydration and drying.
The pH of the aqueous solution was 13.8.
The weight loss rates are shown in Table 1.

Comparative Example 5
A processed knitted fabric was obtained in the same manner as in Example 3 except that the weft knitted fabric used in Comparative Example 1 was used.
The pH of the aqueous solution was 13.8.
The weight loss rates are shown in Table 1. The weight loss rate was 1/2 compared to Example 3.

Comparative Example 6
A processed knitted fabric was obtained in the same manner as in Example 3 except that the weft knitted fabric used in Comparative Example 2 was used.
The pH of the aqueous solution was 13.8.
The weight loss rates are shown in Table 1. As compared to Example 3, the weight loss rate was 1/39.

  As shown in Table 1, when alkali reduction is performed with sodium carbonate, the modified polyester fiber of Example 1 has a higher weight loss rate than the general cationic dyeable polyester fiber of Comparative Example 1, and the comparative example The regular polyester fiber of No. 2 could not be reduced by alkali with sodium carbonate. In addition, when alkali reduction is performed with potassium carbonate, the modified polyester fiber of Example 2 has a higher weight loss rate than the general cationic dyed polyester fiber of Comparative Example 3, and the regular polyester fiber of Comparative Example 4 has With potassium carbonate, alkali reduction could not be performed. When alkali reduction was performed with caustic soda, the modified polyester fiber of Example 3 had a higher weight loss rate than the general cationic dyed polyester fiber of Comparative Example 5 and the regular polyester fiber of Comparative Example 6.

Example 4
Treated cloth:
A warp knitted fabric (modified polyester fiber = 16.7%, regular polyester fiber = 83.4%) using the modified polyester fiber used in Example 1 and the regular polyester fiber used in Comparative Example 2 As the removal processing agent, a removal processing agent having the following composition was used.
・ Sorbitose C-5 (10% aqueous solution) (Avebe) 50% by mass
-Sodium carbonate (manufactured by Tokuyama Corp., trade name: soda ash) 10% by mass
-Water 40% by mass
A square pattern was printed on the treated fabric with the above-mentioned scraping agent, and drying was performed at 110 ° C. for 2 minutes. Next, superheated steam treatment was performed at 180 ° C. for 8 minutes using an HT steamer. Then, after wash | cleaning by 80 degreeC * 20 minutes with the soaping bath of 2 g / L of Laccor ISF (Aeisei Chemical Industry Co., Ltd. make, nonionic surfactant), water washing, dehydration, drying was carried out, and the fabric which carried out the caries processing was obtained.

  Evaluation: The peelability was visually evaluated. As the evaluation criteria, for the removal property, fibers which can not be visually checked in the imprinted part are regarded as ◎, and the residue can be checked visually but the removal is possible, and it can be used as a product Those which could be judged as ○, those which could be visually checked for residues, not being able to be removed, and those which could be judged to be unusable as goods were regarded as x. Further, the burst strength of the removed portion was measured according to JIS L 1018 Murren method. The results are shown in Table 2. The burst strength of the warp knitted fabric of the non-prevented portion was 804 kPa.

[Example 5]
As shown in Table 2, the paste solution composition was subjected to the same procedure as in Example 4 except that a corrosion promoter (made by Meisei Chemical Industry Co., Ltd., May Printer OP-2) was used, to obtain a fabric subjected to a dental erosion process. Table 2 shows the evaluation of its dismovability.
With the use of the above-mentioned removal accelerator, the same removal performance as when using a strong alkali was obtained. On the other hand, the decrease in burst strength was small.

[Comparative Examples 7 and 8]
In the same manner as in Example 2 except that each composition and conditions shown in Table 2 were used as the scraping agent, the scraping process was performed, and the resulting scraped fabric was evaluated. The results are shown in Table 2.
Since the alkalinity was strong, the carriability was good, but the reduction in burst strength was large.

As shown in Table 2, in Example 4 in which only sodium carbonate was contained, it was possible to carry out the erosion process, and there was little reduction in the strength of the ejected portion. On the other hand, in Comparative Example 7 using guanidine carbonate and Comparative Example 8 using sodium hydroxide, the removal property of the removed portion was good, but an extreme decrease in strength of the removed portion was observed.
Although the processing agent using guanidine carbonate has a pH of 11.8, it is known that guanidine carbonate becomes strongly alkaline upon heating, so that the reduction in burst strength is increased.
In addition, in Example 5 containing Mayprinter OP-2 which is a caries removal accelerator and sodium carbonate, good cariesability was obtained, and the reduction in strength of the carious part was small.

[Example 6]
A knitted fabric (modified polyester fiber 50% / regular polyester fiber 50) in which the treated fabric is the same modified polyester fiber as in Example 1 and the same regular polyester fiber as in Comparative Example 2 (84 dtex manufactured by Teijin Limited) In the same manner as in Example 5 except that%) was used, a removal process was performed to obtain a removed fabric. Table 3 shows the evaluation of its dismovability. As the evaluation criteria, for the removal property, fibers which can not be visually checked in the imprinted part are regarded as ◎, and the residue can be checked visually but the removal is possible, and it can be used as a product Those which could be judged as ○, those which could be visually checked for residues, not being able to be removed, and those which could be judged to be unusable as goods were regarded as x.

[Comparative Examples 9 to 12]
In the same manner as in Example 4 except that the modified polyester fiber of Example 4 was changed to the polyester fiber described in Table 3, a removal-processed fabric was obtained. Table 3 shows the evaluation of its dismovability.

  According to the present invention, by using the modified polyester fiber as the modified polyester fiber, only the modified polyester fiber of the printing section is subjected to the alkali-knitting without being reduced in the woven and knitted fabric made of the modified polyester fiber and the unmodified polyester fiber. It is possible to obtain a scraped treated cloth which is excellent in corrosion resistance of the modified polyester fiber by eliminating the embrittlement of the unmodified polyester fiber, and which is highly harmful to humans. Since it is not used, it is possible to perform high-safety corrosion-removing work.

Claims (8)

It is a woven or knitted fabric containing modified polyester fiber and non-weight-reduced fiber whose weight is reduced under the condition of pH 8 or more and 13 or less, wherein said modified polyester fiber has ethylene terephthalate as a main constituent unit and has 4 or more and 8 or less carbon atoms. A modified polyester fiber in which 16 to 25 mol% of aliphatic dicarboxylic acid and 2 to 5 mol% of metal sulfonate group-containing aromatic dicarboxylic acid are copolymerized, and the above-mentioned modified polyester fiber is reduced Woven and knitted fabric having a toothed portion.   The woven or knitted fabric according to claim 1, wherein the burst strength of the woven or knitted fabric of the removed portion is 250 kPa or more and 900 kPa or less.   The woven or knitted fabric according to claim 1 or 2, wherein the strength retention of the burst strength of the ejected portion of the woven or knitted fabric relative to the burst strength of the non-extracted portion of the woven or knitted fabric is 50% or more. The woven or knitted fabric according to any one of claims 1 to 3 , wherein the non-weight loss fibers contain 50% by mass or more and 95% by mass or less of synthetic fibers. The woven or knitted fabric according to claim 4 , wherein the synthetic fiber is any of regular polyester fiber, polyamide fiber, elastic fiber, polyolefin fiber, and acrylic fiber. The woven or knitted fabric according to any one of claims 1 to 5 , wherein a single fiber fineness of the modified polyester fiber is 0.6 dtex or more and 3.5 dtex or less. The woven or knitted fabric according to claim 5 or 6 , wherein the elastic fiber is any one of polyurethane fiber, polytrimethylene terephthalate fiber, and polybutylene tephthalate fiber. The ethylene terephthalate is used as a main constituent unit, and the amount is 16 to 25 mol% of an aliphatic dicarboxylic acid having 4 to 8 carbon atoms, and 2 mol of a metal sulfonate group-containing aromatic dicarboxylic acid which reduces its weight under conditions of pH 8 to 13 Loss removal processing agent is printed on a fabric containing modified polyester fiber and non-weight loss fiber copolymerized by 5% or more and 5% by mol or less, and superheated steam is given to the portion printed by the removal processing agent to lose weight It is a manufacturing method of a woven or knitted fabric to be processed, wherein the pH of the scraping agent is 8 or more and 13 or less, the heating method is superheated steam at 150 ° C. or more and 200 ° C. or less, and the heating time is 5 minutes or more and 15 minutes The manufacturing method of the woven fabric which is the following.