JPH0694623B2 - Weight reduction method for polyester fiber knitted fabric - Google Patents
Weight reduction method for polyester fiber knitted fabricInfo
- Publication number
- JPH0694623B2 JPH0694623B2 JP59279385A JP27938584A JPH0694623B2 JP H0694623 B2 JPH0694623 B2 JP H0694623B2 JP 59279385 A JP59279385 A JP 59279385A JP 27938584 A JP27938584 A JP 27938584A JP H0694623 B2 JPH0694623 B2 JP H0694623B2
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- treatment bath
- knitted fabric
- weight
- weight reduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明はポリエステル繊維編織物の減量加工法、すなわ
ち編織物中のポリエステル繊維を部分的に加水分解させ
て編織物の物性を改善する方法に関するものである。The present invention relates to a method for reducing the weight of a polyester fiber knitted fabric, that is, a method for partially hydrolyzing the polyester fibers in the knitted fabric to improve the physical properties of the knitted fabric. It is a thing.
＜従来の技術＞ ポリエステル繊維を含む編織物、すなわちポリエステル
糸またはポリエステル繊維と木綿やナイロン等との混紡
交編織物を減量加工することは公知である。減量加工に
よりポリエステルは加水分解してテレフタル酸ソーダと
エチレングリコールとなる。<Prior Art> It is known to reduce the weight of a knitted fabric containing polyester fibers, that is, a mixed spun knitted fabric of polyester yarns or polyester fibers with cotton or nylon. The weight reduction process hydrolyzes the polyester into sodium terephthalate and ethylene glycol.
ポリエステル繊維編織物の減量加工法はいくつか知られ
ているが、最も一般的には塩基性物質、一般には苛性ソ
ーダ、を含む水溶液中にポリエステル繊維編織物を浸漬
し、高温に保持することにより行なわれる。ポリエステ
ルはその末端から加水分解してゆき、テレフタル酸ソー
ダが生成する。Although several methods for reducing the weight of a polyester fiber knitted fabric are known, most commonly, it is performed by immersing the polyester fiber knitted fabric in an aqueous solution containing a basic substance, generally caustic soda, and holding it at a high temperature. Be done. Polyester is hydrolyzed from its end to produce sodium terephthalate.
＜発明が解決しようとする問題点＞ このような減量加工法における問題点の一つは、減量加
工率を如何にして精度よく制御するかにある。従来行な
われていた方法としては、被処理ポリエステル繊維編織
物にこれと同じ試験布を取付けて減量加工を行ない、所
望の減量加工率に近づいたならばこの試験布を取出し、
その重量を測定して減量率を算出する方法がある。しか
し、この方法では、試験布の重量測定中も被処理ポリエ
ステル編織物の加水分解は進行するので、所望の減量加
工率の製品を得ることは困難である。また、他の方法と
して、予じめ苛性ソーダ濃度、処理温度、処理時間およ
び減量加工率の関係を、実験的ないし経験的に求めて相
関図表を作成しておき、これを用いて所望の減量加工率
に到達する時間を推定する方法がある。しかし、この方
法も苛性ソーダ濃度や温度の厳密な管理が困難なので、
常に所望の減量加工率の製品を与えるものではない。<Problems to be Solved by the Invention> One of the problems in such a weight reduction processing method is how to accurately control the weight reduction processing rate. As a conventional method, the same test cloth as this is attached to the polyester fiber knitted fabric to be processed, and the weight reduction processing is performed, and when the desired weight reduction processing rate is approached, the test cloth is taken out,
There is a method of measuring the weight and calculating the weight loss rate. However, according to this method, hydrolysis of the polyester knitted fabric to be treated proceeds even during the weight measurement of the test cloth, so that it is difficult to obtain a product having a desired weight reduction processing rate. As another method, experimentally or empirically obtain the relationship between the pre-determined caustic soda concentration, processing temperature, processing time and reduction processing rate, and create a correlation chart, and use this to create the desired reduction processing. There is a way to estimate the time to reach the rate. However, this method is also difficult to strictly control caustic soda concentration and temperature.
It does not always give a product with the desired weight reduction processing rate.
従つて本発明は減量加工率を精度よく制御することので
きるポリエステル繊維編織物の減量加工法を提供するこ
とを目的とするものであり、本発明者らが先に特願昭59
−72279として提案した減量加工法の改良に関するもの
である。Therefore, the present invention is intended to provide a method for reducing the weight of a polyester fiber knitted fabric capable of controlling the weight reduction rate with high accuracy.
It relates to the improvement of the weight reduction processing method proposed as -72279.
＜問題点を解決するための手段＞ 本発明によれば、ポリエステル繊維編織物を減量加工す
るに際し、装置内に編織物および処理浴を準備した段階
で編織物の量、処理浴の濃度および量、並びに予定の減
量加工率に基づいて加工終了時の処理浴の推定濃度を算
出しておき、一方、減量加工の定常進行に際し処理浴の
濃度を経時的に測定し、この測定値を統計的に処理して
予じめ算出しておいた推定濃度に到達する時刻、すなわ
ち加工終了の時点を知ることにより減量加工率を精度よ
く制御することができる。<Means for Solving Problems> According to the present invention, when the polyester fiber knitted fabric is subjected to the weight reduction processing, the amount of the knitted fabric, the concentration and the amount of the treatment bath at the stage when the knitted fabric and the treatment bath are prepared in the apparatus. , And the estimated concentration of the processing bath at the end of processing based on the planned reduction processing rate, while measuring the concentration of the processing bath over time during steady progress of weight reduction processing, and statistically measuring this measurement value. It is possible to control the reduction processing rate with high accuracy by knowing the time at which the estimated concentration that has been processed in advance and reaches the estimated concentration is reached, that is, the processing end time.
本発明についてさらに詳細に説明すれば、本発明は公知
の減量加工を行なうに際し、その減量加工率を精度よく
制御する方法を提供するものである。The present invention will be described in more detail. The present invention provides a method for accurately controlling the reduction machining rate when performing known reduction machining.
本発明はポリエステル繊維のみからなる編織物だけでは
なく、ポリエステル−木綿やポリエステル−ナイロンな
どのポリエステルと減量加工条件下で実質的に苛性ソー
ダと反応しない他の繊維との混合物からなる編織物も対
象とすることができる。The present invention is not limited to knitted fabrics consisting only of polyester fibers, but also to knitted fabrics consisting of a mixture of polyester such as polyester-cotton or polyester-nylon with other fibers that do not substantially react with caustic soda under weight reduction processing conditions. can do.
減量加工の温度は通常80〜100℃程度であるが、所望な
らばこの温度範囲外でも行なうことができる。本発明は
高温、すなわち減量加工の反応速度が大きい場合に殊に
有利に適用される。The temperature for weight reduction processing is usually about 80 to 100 ° C., but if desired, it can be performed outside this temperature range. The present invention is particularly advantageously applied at high temperatures, that is, when the reaction rate of weight reduction processing is high.
減量加工の処理浴としては通常、苛性ソーダ水溶液が用
いられる。苛性ソーダの濃度は通常、20〜150g/lの範囲
で用いられる。他の条件が一定ならば、高濃度に苛性ソ
ーダを含む処理液を用いるほど減量加工はすみやかに進
行する。本発明はこのような高濃度に苛性ソーダを含む
処理液を用いる場合に殊に有利なので、50g/l以上の濃
度のものを用いるのが好ましい。なお、減量加工は大過
剰の苛性ソーダを用いて行なわれるので、反応終了後、
処理浴は回収して苛性ソーダ濃度を調整したのち再使用
するのが好ましい。処理浴の回収−再使用を反復する
と、処理浴中に反応により生成したテレフタル酸ソーダ
およびエチレングリコールが蓄積し反応速度に影響を及
ぼすが、本発明はこのような反応生成物の蓄積した処理
浴を用いた場合でも支障なく実施することができる。本
発明の好ましい実施態様の一つでは、反応終了後、編織
物は処理浴から分離され、処理浴は苛性ソーダを添加し
て濃度調整したのち次回の反応に供される。この操作を
反復すると処理浴中の加水分解生成物濃度は漸次上昇す
るが、やがて減量加工により生成する加水分解生成物の
量と減量加工された編織物に含まれ排出される処理浴中
の加水分解生成物の量とが一致するようになり、処理浴
中の加水分解生成物の濃度は平衡状態に達する。A caustic soda aqueous solution is usually used as a treatment bath for weight reduction processing. The concentration of caustic soda is usually used in the range of 20 to 150 g / l. If the other conditions are constant, the weight reduction process proceeds more promptly as the treatment liquid containing a higher concentration of caustic soda is used. Since the present invention is particularly advantageous when using a treatment solution containing caustic soda in such a high concentration, it is preferable to use a treatment solution having a concentration of 50 g / l or more. In addition, since the weight reduction processing is performed using a large excess of caustic soda, after the reaction is completed,
It is preferable to recover the treatment bath, adjust the concentration of caustic soda, and then reuse it. When the treatment bath is repeatedly collected and reused, sodium terephthalate and ethylene glycol produced by the reaction are accumulated in the treatment bath to affect the reaction rate. It can be carried out without any trouble even when using. In one of the preferred embodiments of the present invention, after the reaction, the knitted fabric is separated from the treatment bath, and the treatment bath is subjected to concentration adjustment by adding caustic soda, and then subjected to the next reaction. When this operation is repeated, the concentration of hydrolysis products in the treatment bath gradually rises, but the amount of hydrolysis products produced by the weight reduction process and the water content in the treatment bath discharged from the treatment fabric contained in the weight reduction fabric are reduced. The amount of degradation products becomes consistent and the concentration of hydrolysis products in the treatment bath reaches equilibrium.
減量加工の反応時間は、処理条件および所望の減量加工
率により異なるが通常、数十分〜２時間程度である。な
お、前述の如く減量加工は大過剰の苛性ソーダを用いて
行なわれるので、１回の減量加工によつて消費される苛
性ソーダ量は、通常、多くても処理浴中の苛性ソーダの
10％程度にすぎない。従つて減量加工はほぼ一定の苛性
ソーダ濃度で行なわれるとみなすことができ、反応温度
を一定に維持すると、減量加工率は反応時間にほぼ一次
で比例して増加する。しかし、処理浴中の苛性ソーダ濃
度の測定には誤差を伴なうことが不可避である。従つて
本発明では、減量加工の間、反応温度をできるだけ一定
に維持すると共に処理浴の苛性ソーダ濃度を経時的に、
好ましくは一定時間毎に測定し、この測定値を最小自乗
法等により統計的に処理して測定誤差の影響を排除した
正確な苛性ソーダ濃度を算出する。このようにして算出
された苛性ソーダ濃度を予じめ算出されている予定加工
率に到達時の処理浴の苛性ソーダ濃度と対比し、両者が
一致した時点をもつて反応の終点とする。なお、苛性ソ
ーダ濃度の測定には、１回につき２〜５分間の時間を要
するので、測定結果がでた時点では編織物の減量加工は
更に進行していることになる。従つて減量加工の反応速
度が小さく、この時間の遅れが加工率に殆んど影響しな
い場合には、測定値（算出濃度）が予定加工率到達時の
処理浴の濃度と一致するかまたは初めてこれを越えたと
きをもつて反応の終点とすればよい。しかし反応速度が
大きく時間遅れが無視できない場合には、測定値の統計
的処理により予定加工率到達時の処理浴の濃度と一致す
る時刻を予測し、それが次回の測定値が算出されるまで
の間に存在すればその時刻を反応の終点とすればよい。
若し、予測された時刻が次回の測定値が算出されるまで
の間に存在しなければ、次回の測定を行なえばよい。な
お、減量加工率がこのようにして決定された終点に到達
したならば装置から処理浴を排出して編織物を処理浴と
分離し、次いで編織物を水洗して付着している苛性ソー
ダ及び加水分解生成物を除去する。これらの操作中にも
若干の加水分解が進行するので、反応を終了させる操作
の開始時点は厳密に予測された終点と一致させる必要は
なく、減量加工率の許容誤差および上述の後処理中の反
応量などを考慮して、その前後に適宜決定すればよい。The reaction time for the weight reduction processing varies depending on the processing conditions and the desired weight reduction processing rate, but is usually several tens of minutes to 2 hours. As described above, since the weight reduction process is performed using a large excess of caustic soda, the amount of caustic soda consumed by one weight reduction process is usually at most the amount of caustic soda in the treatment bath.
Only about 10%. Therefore, weight reduction can be regarded as being performed at a substantially constant caustic soda concentration, and if the reaction temperature is kept constant, the weight reduction rate increases almost linearly with the reaction time. However, it is inevitable that the measurement of the caustic soda concentration in the treatment bath involves an error. Therefore, in the present invention, during the weight reduction processing, the reaction temperature is kept as constant as possible, and the caustic soda concentration of the treatment bath is changed with time.
Preferably, the measurement is performed at regular intervals, and the measured value is statistically processed by the method of least squares or the like to calculate an accurate caustic soda concentration that eliminates the influence of measurement error. The caustic soda concentration calculated in this way is compared with the caustic soda concentration of the treatment bath at the time of reaching the preliminarily calculated planned processing rate, and the end point of the reaction is set to have a time point at which both coincide. Since the measurement of the caustic soda concentration requires 2 to 5 minutes each time, it means that the weight reduction process of the knitted fabric is further progressing at the time when the measurement result is obtained. Therefore, if the reaction speed of the weight reduction processing is small and this time delay has almost no effect on the processing rate, the measured value (calculated concentration) agrees with the concentration of the treatment bath when the planned processing rate is reached or The end point of the reaction may be set when the time exceeds this. However, if the reaction speed is large and the time delay cannot be ignored, the time that coincides with the concentration of the processing bath when the planned processing rate is reached is predicted by statistical processing of the measured value, and that time is calculated until the next measured value is calculated. If it exists in between, the time may be set as the end point of the reaction.
If the predicted time does not exist until the next measurement value is calculated, the next measurement may be performed. When the reduction processing rate reaches the end point thus determined, the treatment bath is discharged from the device to separate the knitted fabric from the treatment bath, and then the knitted fabric is washed with water to remove the caustic soda and the water adhering thereto. The decomposition products are removed. Since some hydrolysis will proceed during these operations, it is not necessary to match the start point of the operation that terminates the reaction with the strictly predicted end point, and the tolerance of the weight reduction rate and the above-mentioned post-treatment It may be appropriately determined before and after the reaction in consideration of the reaction amount and the like.
本発明は処理浴中に編織物を浸漬して減量加工を行な
い、かつ減量加工中は処理浴およびその成分が減量加工
装置から実質的に出入しないようになつている任意の装
置を用いて行なうことができる。The present invention is carried out by dipping the knitted fabric in the treatment bath to carry out the weight reduction process, and using any device adapted to substantially prevent the treatment bath and its components from entering and leaving the weight reduction processing device during the weight reduction process. be able to.
本発明により減量加工を行なうには、先ず装置内に処理
浴および編織物を収容し、かつその処理浴の量および苛
性ソーダ濃度並びに編織物の乾燥重量を決定する。吊下
げ式減量加工装置およびウインス式減量加工装置のよう
に、処理浴の収容されている装置内に編織物を乾燥状態
で投入する場合には、これらの決定は容易である。しか
し液流式減量加工装置のように、装置内に編織物を水流
の作用により装入し、次いで装置から水を排出したのち
処理浴を供給する場合には、供給した処理浴が装置内の
水により希釈されるので、供給した処理浴の量および濃
度を補正して装置内の正しい処理浴の量および濃度を算
出しなければならない。この補正は次のようにして行な
うことができる。すなわち装置に編織物を装入して水を
排出したのち処理浴を導入する。低温すなわち加水分解
反応が実質的に進行しない状態でポンプを作動させて処
理浴により編織物を流動させて装置内の水による処理浴
の希釈を促進し、装置内の処理浴の濃度の局所的不均一
を解消したのち、処理浴の濃度（C1）を測定する。装置
に導入した処理浴の量をＶ（ｌ）、その苛性ソーダ濃度
をＣ（g/l）とすると、希釈後の処理浴の量V1（ｌ）は
次式で与えられる。To carry out the weight reduction process according to the invention, firstly the treatment bath and the knitted fabric are placed in an apparatus, and the amount of the treatment bath and the caustic soda concentration and the dry weight of the knitted fabric are determined. These determinations are easy when the knitted fabric is put in a dry state into a device containing a treatment bath, such as a hanging type weight reduction device and a wins type weight reduction device. However, when a knitted fabric is charged into the device by the action of a water flow, and then the treatment bath is supplied after the water is discharged from the device, as in the case of the liquid flow type weight reduction processing device, the supplied treatment bath is Since it is diluted with water, the amount and concentration of the supplied processing bath must be corrected to calculate the correct amount and concentration of the processing bath in the device. This correction can be performed as follows. That is, a knitted fabric is loaded into the apparatus, water is discharged, and then a treatment bath is introduced. At a low temperature, that is, when the hydrolysis reaction does not substantially proceed, the pump is operated to flow the knitted fabric by the treatment bath to promote the dilution of the treatment bath with the water in the device, and to reduce the local concentration of the treatment bath in the device. After eliminating the non-uniformity, measure the concentration (C 1 ) of the treatment bath. When the amount of the treatment bath introduced into the apparatus is V (l) and the caustic soda concentration is C (g / l), the amount of the treatment bath after dilution V 1 (l) is given by the following equation.
V1＝Ｖ×C/C1 また、編織物の装入量をＷ（kg）、予定の減量加工率を
Ａ（％）とすると、予定の減量加工率に到達したときの
処理浴の苛性ソーダ濃度C2（g/l）は次式で与えられ
る。V 1 = V × C / C 1 If the knitted fabric charge amount is W (kg) and the planned reduction processing rate is A (%), caustic soda in the treatment bath when the planned reduction processing rate is reached The concentration C 2 (g / l) is given by the following equation.
次いで処理浴を加熱して所定の反応温度まで昇温させ、
できるだけ一定温度で反応を進行させる。同時に反応が
定常的に進行している間、処理浴中の苛性ソーダ濃度を
経時的に測定し、この測定値を最小自乗法のような統計
的手法で処理して処理浴中の苛性ソーダ濃度を決定す
る。これはマイクロコンピュータを備えた自動滴定装置
を用いて行なわれる。 Then, the treatment bath is heated to raise the temperature to a predetermined reaction temperature,
Allow the reaction to proceed at as constant a temperature as possible. At the same time, while the reaction is proceeding steadily, the concentration of caustic soda in the treatment bath is measured over time, and the measured value is processed by a statistical method such as the least square method to determine the concentration of caustic soda in the treatment bath. To do. This is done using an automatic titrator equipped with a microcomputer.
＜発明の効果＞ 本発明によれば、ポリエステル繊維を含む編織物の減量
加工に際し、常に所望の加工率の製品を得ることができ
る。また、本発明によれば常に所望の減量加工率到達時
の処理浴濃度と実際の処理浴濃度とを対比しながら反応
を進めるので、処理浴として如何なる組成のものでも用
いることができる。従つて加水分解生成物の蓄積した処
理浴を反復使用できるので、苛性ソーダの消費量を節減
できる。<Effects of the Invention> According to the present invention, it is possible to always obtain a product having a desired processing rate when reducing the weight of a knitted fabric containing polyester fibers. Further, according to the present invention, the reaction is always proceeded while comparing the treatment bath concentration when the desired reduction processing rate is reached with the actual treatment bath concentration, so that any treatment bath having any composition can be used. Therefore, the treatment bath with accumulated hydrolysis products can be repeatedly used, so that the consumption of caustic soda can be reduced.
なお以上の説明では反応により消費される苛性ソーダの
濃度を指標とする場合について説明したが、本発明は反
応により生成するテレフタル酸ソーダ等の加水分解生成
物の濃度を指標としても行なうことができることは自明
である。しかし測定精度の点からして苛性ソーダ濃度を
指標とする方が好ましい。In the above description, the case where the concentration of caustic soda consumed by the reaction is used as an index has been described, but the present invention can also be performed by using the concentration of a hydrolysis product such as sodium terephthalate produced by the reaction as an index. It is self-explanatory. However, from the viewpoint of measurement accuracy, it is preferable to use the caustic soda concentration as an index.
＜実施例＞ 液流式減量加工装置にポリエステル糸の織布15.50kgを
水流の作用により装入したのち、温潤状態の織布を残し
て過剰の水を排出した。次いで苛性ソーダ81.8g/lを含
む常温の処理浴200.0lを装置に供給し、ポンプを作動さ
せて処理液により織布を装置内で約５分間流動させたの
ち処理浴の濃度を３回測定したところ、その苛性ソーダ
濃度は73.1g/lであつた。従つて装置内の処理浴の量は2
24lである。処理浴を90℃に加熱し、以後この温度を維
持して減量率25％を目標に反応を行なわせた。この定常
反応の間、自動滴定装置で装置内の処理浴の濃度を連続
的に測定し表１の結果を得た。この測定値を滴定装置に
組込んであるマイクロコンピュータで逐次最小自乗法に
より処理して減量率を算出していつたところ、測定開始
から59分04秒後に処理浴濃度が65.5g/lとなり、減量率2
5％に対応する処理浴濃度65.7g/lを初めて超過すること
が予測されたので、この時点で装置から処理浴を排出し
た。後処理として装置内に水を導入して織布を洗浄する
ことを３回反復し、良好な仕上りの減量加工布を得た。
なお、織布に取出けておいた試験布の減量加工率は25.4
％であり、上記の方法により算出した値と良く一致し
た。<Example> 15.50 kg of a woven fabric of polyester yarn was charged into a liquid flow reduction apparatus by the action of a water flow, and then excess water was discharged while leaving the warm woven fabric. Then, 200.0 l of a normal temperature treatment bath containing 81.8 g / l of caustic soda was supplied to the apparatus, the pump was operated to allow the treatment solution to flow the woven fabric in the apparatus for about 5 minutes, and then the concentration of the treatment bath was measured three times. However, the caustic soda concentration was 73.1 g / l. Therefore, the amount of processing bath in the equipment is 2
24l. The treatment bath was heated to 90 ° C., and this temperature was maintained thereafter to carry out the reaction with the goal of a weight loss rate of 25%. During this steady reaction, the concentration of the treatment bath in the apparatus was continuously measured by the automatic titrator and the results shown in Table 1 were obtained. The measured value was processed by the microcomputer installed in the titrator by the successive least squares method to calculate the weight reduction rate.When the measurement bath started, 59 minutes 04 seconds later, the concentration of the treatment bath was 65.5 g / l, and the weight reduction was performed. Rate 2
The treatment bath was discharged from the apparatus at this point because it was predicted for the first time to exceed the treatment bath concentration of 65.7 g / l corresponding to 5%. The post-treatment was repeated three times by introducing water into the apparatus to wash the woven cloth, and a weight-reduced cloth having a good finish was obtained.
The reduction rate of the test cloth that had been taken out to the woven cloth was 25.4.
%, Which was in good agreement with the value calculated by the above method.
表１ 測定開始からの経過時間 測定値（g/l） ０ 72.9 分 2.54 73.2 5.48 72.4 8.39 73.3 11.32 72.6 14.33 72.3 17.30 71.5 20.19 71.5 23.09 70.5 25.58 70.2 28.47 69.4 31.33 69.2 34.19 68.4 37.03 68.9 39.51 68.2 42.37 67.7 45.22 67.3 48.05 66.7 50.50 66.4 53.34 66.6 56.19 65.9 （59.04） （65.5）←予測値 Table 1 Elapsed time from start of measurement Measured value (g / l) 0 72.9 minutes 2.54 73.2 5.48 72.4 8.39 73.3 11.32 72.6 14.33 72.3 17.30 71.5 20.19 71.5 23.09 70.5 25.58 70.2 28.47 69.4 31.33 69.2 34.19 68.4 37.03 68.9 39.51 68.2 42.37 67.7 45.22 67.3 48.05 66.7 50.50 66.4 53.34 66.6 56.19 65.9 (59.04) (65.5) ← Forecast
Claims (6)
とポリエステル繊維を含む編織物とを接触させてポリエ
ステル繊維を加水分解させるポリエステル繊維を含む編
織物の減量加工法において、加水分解が実質的に進行す
る前に編織物を収容している装置内の処理浴の量とその
濃度とを決定すること、決定された処理浴の量およびそ
の濃度、装置内の編織物の量、並びに予定減量率に基づ
いて、予定減量率に到達したときの処理浴の推定濃度を
算出すること、処理浴を所定温度まで昇温させ、以後は
ほぼこの温度で加水分解を進行させること、処理浴がほ
ぼ所定の温度に昇温してから経時的に処理浴の濃度を測
定すること、この濃度測定値を統計的に処理して該推定
濃度に到達する時刻を推定し、その時刻に達したときを
もつて加水分解反応の終点とすることを特徴とするポリ
エステル繊維編織物の減量加工法。1. A method for reducing the weight of a knitted fabric containing polyester fibers, comprising the step of bringing a treatment bath containing a basic substance into contact with a knitted fabric containing polyester fibers in a weight reduction device to hydrolyze the polyester fibers. Determining the amount and concentration of the treatment bath in the device containing the knitted fabric before substantially proceeding, the determined amount and concentration of the treatment bath, the amount of knitted fabric in the device, and Based on the planned weight loss rate, calculate the estimated concentration of the treatment bath when the planned weight loss rate is reached, raise the temperature of the treatment bath to a predetermined temperature, and then proceed with hydrolysis at approximately this temperature. The temperature in the treatment bath is measured over time after the temperature rises to almost a predetermined temperature, the concentration measurement value is statistically processed to estimate the time when the estimated concentration is reached, and the time is reached. Hydrolysis with time Reduction processing method of a polyester fiber knitted fabric, characterized in that the end point.
定時間毎に処理浴の濃度を測定すること、この濃度測定
値を統計的に処理して次回の濃度測定値を予測するこ
と、この予測値と該推定濃度とを対比し、予測値が該推
定濃度と一致するかまたは初めてこれを越えたときをも
つて加水分解を終了させることを特徴とする特許請求の
範囲第１項記載のポリエステル繊維編織物の減量加工
法。2. The concentration of the treatment bath is measured at regular intervals after the temperature of the treatment bath is raised to a substantially predetermined temperature, and the concentration measurement value is statistically processed to predict the next concentration measurement value. Claim 1, wherein the predicted value is compared with the estimated concentration, and the hydrolysis is terminated when the predicted value matches the estimated concentration or exceeds the estimated concentration for the first time. The method for reducing the weight of a polyester fiber knitted fabric according to the item.
よる処理であることを特徴とする特許請求の範囲第１項
または第２項記載のポリエステル繊維編織物の減量加工
法。3. The method for reducing the weight of a polyester fiber knitted woven fabric according to claim 1 or 2, wherein the statistical processing of the density measurement value is processing by a least square method.
の濃度を滴定により測定することを特徴とする特許請求
の範囲第１項ないし第３項のいずれかに記載のポリエス
テル繊維編織物の減量加工法。4. The polyester fiber knitted fabric according to claim 1, wherein the concentration of the basic substance in the treatment bath is measured by titration as the concentration of the treatment bath. Weight loss processing method.
工装置から処理浴を回収し、これに塩基性物質を添加し
てその濃度を所定値に調整したのち次回の減量加工に再
使用することを反復することを特徴とする特許請求の範
囲第１項ないし第４項のいずれかに記載のポリエステル
繊維編織物の減量加工法。5. When the hydrolysis reaction reaches the end point, the treatment bath is recovered from the weight reduction processing apparatus, a basic substance is added to this to adjust its concentration to a predetermined value, and then reused for the next weight reduction processing. The method for reducing the weight of a polyester fiber knitted woven fabric according to any one of claims 1 to 4, wherein the process is repeated.
処理浴の量とその濃度の決定を、編織物を含水状態で収
容している装置内に既知濃度の処理浴を既知量導入する
こと、装置内の水分による処理浴の濃度の局部的不均一
が実質的に解消したのちに処理浴の濃度を測定するこ
と、この測定値と装置に導入時の処理浴の濃度およびそ
の導入量とから装置内の処理浴の量を算出することによ
り行なうことを特徴とする特許請求の範囲第１項ないし
第５項のいずれかに記載のポリエステル繊維編織物の減
量加工法。6. A method for determining the amount and concentration of a treatment bath in a device before hydrolysis substantially progresses by determining a known amount of a treatment bath having a known concentration in a device containing a knitted fabric in a water-containing state. Introducing, measuring the concentration of the treatment bath after the local non-uniformity of the concentration of the treatment bath due to the moisture in the device is substantially eliminated, the measured value and the concentration of the treatment bath at the time of introduction into the device and its The method for reducing the weight of a polyester fiber knitted woven fabric according to any one of claims 1 to 5, which is carried out by calculating the amount of the treatment bath in the apparatus from the amount introduced.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59279385A JPH0694623B2 (en) | 1984-12-28 | 1984-12-28 | Weight reduction method for polyester fiber knitted fabric |
| US06/722,159 US4654911A (en) | 1984-04-11 | 1985-04-11 | Process for degrading by hydrolysis textiles comprising polyester fiber or acetate fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59279385A JPH0694623B2 (en) | 1984-12-28 | 1984-12-28 | Weight reduction method for polyester fiber knitted fabric |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61160475A JPS61160475A (en) | 1986-07-21 |
| JPH0694623B2 true JPH0694623B2 (en) | 1994-11-24 |
Family
ID=17610401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59279385A Expired - Fee Related JPH0694623B2 (en) | 1984-04-11 | 1984-12-28 | Weight reduction method for polyester fiber knitted fabric |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0694623B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2845712B2 (en) * | 1993-03-05 | 1999-01-13 | 株式会社 日阪製作所 | Batch-type knitted textile products weight loss processing method |
| JP2580461B2 (en) * | 1993-03-23 | 1997-02-12 | 株式会社日阪製作所 | Method for weight reduction of knitted fabric containing polyester fiber |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56144268A (en) * | 1980-04-08 | 1981-11-10 | Toray Industries | Softening treatment of polytetramethylene terephthalate fiber structure |
| JPS59199862A (en) * | 1983-04-26 | 1984-11-13 | 小松精練株式会社 | Washing of volume reduced processed fabric |
-
1984
- 1984-12-28 JP JP59279385A patent/JPH0694623B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61160475A (en) | 1986-07-21 |
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