JP4404449B2 - Method for measuring the amount of starch on corrugated cardboard - Google Patents
Method for measuring the amount of starch on corrugated cardboard Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
この発明は、段ボールの貼合に使用される澱粉系接着剤の着量を測定する方法に関する。
【０００２】
【従来の技術】
段ボールの接着層を構成する澱粉糊は、段ボール製造に欠かせない主要な要素であり、その澱粉着量が適切でないと、中しんとライナーの剥がれ、中しんやライナーの汚れ等の種々の問題が生じる。したがって、澱粉着量を正確に測定することは、得られる段ボールの品質向上のために必要な手段であり、また、品質判断の基準の一つとなる。
【０００３】
現在、段ボールの接着層における澱粉着量を測定する方法としては、酵素法、トレーシング剤を用いる方法、又は分光測定法等があげられる。上記酵素法[TAPPI T531 om-81]は、段ボール中の澱粉糊を酵素溶液で溶かし出して濾過し、抽出液を乾燥して固形分を秤量する方法である（H,C,Olsen,Tappi,55(7),1091(1972)）。また、上記のトレーシング剤を用いる方法は、亜鉛化合物やリチウム化合物等の第三物質をトレーシング剤として澱粉糊に添加し、添加物質を定量して澱粉着量を求める方法である（C.G.Trudelle,J.Poustis,International Corrugated Containers Conference,35(1993)）。さらに、上記分光測定法は、澱粉糊中のホウ素化合物に着目し、試料を灰化後硫酸で溶解してクルクミンにより呈色したホウ素錯体の分光測定により、澱粉着量を測定する方法である（J.Anic,L.Huybrechts,InternationalPaper Board Industry,31(1),56(1998)）。
【０００４】
【発明が解決しようとする課題】
しかしながら、上記酵素法を用いる場合、接着層だけでなく、原紙中に多く存在する澱粉も同時に秤量されてしまうため、誤差を生じることとなる。例えば、澱粉溶液がサイズプレスされた強化中しんは、中しん重量の約１０％の澱粉を含む。この中しんで構成された段ボールの接着層の澱粉着量を測定する場合、接着層のみならず、その周囲の中しん及びライナーを切り取り、これらから含有する澱粉量を測定する。このとき、中しん及びライナーのみに含まれる澱粉量を別途測定し、これをブランク値として接着層の澱粉着量を求めるが、中しん中の澱粉は、不均一に分散しているため、上記ブランク値が変動することとなる。このブランク値の変動により誤差が発生し、分析精度が低下することとなる。
【０００５】
また、上記トレーシング剤を用いる方法を採用する場合、バッチ毎にトレーシング剤の添加量を正確に管理する必要があり、添加時に細心の注意を払って混合する必要がある。このため、実機で対応するのは困難であるという問題点を有する。
【０００６】
さらに、上記分光測定法を用いる場合は、その測定操作が非常に煩雑で、かつ長時間を要するという問題点を有する。
【０００７】
そこで、この発明は、実機への対応及び測定操作が容易で、かつ、分析精度の高い、段ボールの接着層の澱粉着量の測定法を提供することを目的とする。
【０００８】
【課題を解決するための手段】
この発明は、接着層を有する段ボールからホウ素化合物を溶媒に抽出し、この抽出液に含まれるホウ素量を、誘導結合型高周波プラズマを励起源とする発光分光分析法を用いて定量し、上記接着層に含まれる澱粉量を求めることにより、上記課題を解決したのである。
【０００９】
使用する澱粉糊中に含まれるホウ素の割合は、製造される澱粉糊のバッチ毎にほぼ一定している。このため、このホウ素量を上記の発光分光分析法で測定することにより、接着層に含まれる澱粉量を精度よく、かつ容易に得ることができる。
【００１０】
【発明の実施の形態】
以下、この発明の実施形態を図面を参照して説明する。
【００１１】
この発明にかかる段ボールの澱粉着量の測定方法は、接着層を有する段ボールからホウ素化合物を溶媒に抽出し、この抽出液に含まれるホウ素量を、誘導結合型高周波プラズマを励起源とする発光分光分析法（以下、「ＩＣＰ法」と略する。）を用いて定量し、この接着層に含まれる澱粉量を求める方法である。
【００１２】
上記ＩＣＰ法は、高周波誘導コイルに生じる誘導電流からの放電で起こる誘導結合プラズマによって励起された原子、イオン等の外殻電子が再び低いエネルギー準位に戻るときに発する光を計測し、そのスペクトル線の位置から定性、またその強度から定量を行う方法である。
【００１３】
次に、このＩＣＰ法にかけるサンプルの調製法について説明する。
【００１４】
まず、定量目的の接着層を有する段ボール試料を所定の大きさに裁断する。そして、これに水等の溶媒を加えて撹拌処理又は超音波処理を施す。これらにより、段ボール試料内のホウ素化合物を溶媒に抽出する。次いで、これを濾過して抽出液を得る。これを上記ＩＣＰ法で測定する事によりホウ素量を定量する。そして、段ボールに使用される糊の配合から、澱粉着量を換算算出する。
【００１５】
上記撹拌処理は、５０〜１５００ｒｐｍで撹拌することが好ましい。また、上記超音波処理は、３０，０００〜１００，０００Ｈｚの発振周波数とするのが好ましい。
【００１６】
上記の方法は、中性溶媒で抽出操作を行っているが、アルカリ溶媒を用いることができる。この場合、まず、所定の大きさに裁断された段ボール試料にアルカリ溶媒を加える。そして、この状態で所定時間静置する。その後、酸溶媒で中性又は酸性にし、撹拌処理又は超音波処理を施してホウ素化合物を抽出する。以後は上記と同様にして、澱粉着量を換算算出する。ホウ素化合物は、アルカリに溶出しやすいので、この方法を用いると、より正確な澱粉着量の算出が可能となる。
【００１７】
上記アルカリ溶媒としては、水酸化ナトリウム、水酸化カリウム、水酸化カルシウム、炭酸ナトリウム、炭酸カリウム、炭酸水素ナトリウム、炭酸水素カリウム等があげられる。また、上記酸溶媒としては、硝酸、塩酸、硫酸、リン酸、過酸化水素水、フッ化水素等があげられる。
【００１８】
さらに、もっとより正確な澱粉着量の算出する方法としては、段ボール試料を灰化する方法があげられる。この場合、まず、所定の大きさに裁断された段ボール試料にアルカリ溶媒を加える。そして、１０５℃で２４時間放置した後、５８０〜９００℃で灰化させる。次いで、得られた灰化物に酸溶媒を加えて中性〜酸性にし、撹拌処理又は超音波処理を施してホウ素化合物を抽出する。以後は上記と同様にして、澱粉着量を換算算出する。
【００１９】
この灰化法によると、灰化によりホウ素化合物が単離されるので、抽出がより容易となり、さらにより正確な澱粉着量の算出が可能となる。
【００２０】
【実施例】
以下、実施例を用いてこの発明をより詳細に説明する。まず、使用した澱粉糊の調製法、試料サンプルの調製法、及びＩＣＰによる測定法を説明する。
【００２１】
〔澱粉糊の調製〕
コーンスターチを用い、スタインホール方式で澱粉糊を調製した。得られた澱粉糊中の澱粉濃度は２２重量％、水酸化ナトリウム濃度０．５重量％、ホウ砂比率１．８重量％であった。
【００２２】
〔試料サンプルの調製〕
５×８．５ｃｍに裁断した一般中しん（１２０ｇ／ｍ2 、澱粉含有量３．５ｇ／ｍ2 ）又は強化中しん（２００ｇ／ｍ2 、澱粉含有量２０ｇ／ｍ2 ）を用いた片段テストピース（Ａフルート、ライナは２８０ｇ／ｍ2 、澱粉含有量７．５ｇ／ｍ2 ）の上記中しんの片面に、上記澱粉糊を塗布量を変えて塗布し、直後に秤量してあらかじめ澱粉着量を求めた。次いで、これに、５×８．５ｃｍに裁断したライナ（２８０ｇ／ｍ2 、澱粉含有量７．５ｇ／ｍ2 ）を１７５℃、５秒間貼り合わせた。その後、中しんの中央部で切断し、上記澱粉糊で貼合した側のみを試料サンプルとした。
【００２３】
〔ＩＣＰによるホウ素の定量〕
和光純薬工業（株）製の原子吸光用１０００ｐｐｍホウ素溶液を純水で希釈し、０．１、１、１０ｐｐｍホウ素溶液を調製した。これをＩＣＰ測定装置（リーマン・ラボラトリーズ・インク（LEEMAN LABS.INC.）社製：ＪＩＣＰ−１０００Ｖ）を用いて測定した。その結果、図１に示すように、発光強度とホウ素標準液の濃度は一直線上にのり、検量線が得られた。
【００２４】
そして、下記の各実施例から得られた抽出液中に含まれるホウ素量を上記ＩＣＰ測定装置を用いて定量し、これから澱粉着量を求めた。
【００２５】
（実施例１）
澱粉糊の塗布量の異なる上記試料サンプルを１ｃｍ角に裁断し、３００ｍｌ三角フラスコに入れ、水１５０ｍｌを加え、１２０分間、４００ｒｐｍで撹拌し、濾過して抽出液を得た。その際、水５０ｍｌを洗浄水として添加した。その後、この抽出液のホウ素量を上記ＩＣＰ法で定量し、澱粉着量を求めた。あらかじめ算出しておいた澱粉着量（実測澱粉着量）とこのＩＣＰ法で求められた澱粉着量の関係を図２に示す。
【００２６】
（実施例２）
撹拌のかわりに、３９，０００Ｈｚ、６０分間超音波処理した以外は、実施例１と同様にして抽出液を得た。その後、この抽出液のホウ素量を上記ＩＣＰ法で定量し、澱粉着量を求めた。その結果を図３に示す。
【００２７】
（実施例３）
澱粉糊の塗布量の異なる上記試料サンプルを１ｃｍ角に裁断し、３００ｍｌ三角フラスコに入れ、１％炭酸水素ナトリウム水溶液５０ｍｌを加え、１時間静置した。そして、１Ｎ硝酸５０ｍｌを加えて１２０分間、４００ｒｐｍで撹拌し、濾過して抽出液を得た。その際、水５０ｍｌを洗浄水として添加した。その後、この抽出液のホウ素量を上記ＩＣＰ法で定量し、澱粉着量を求めた。その結果を図４に示す。
【００２８】
（実施例４）
撹拌のかわりに、３９，０００Ｈｚ、６０分間超音波処理した以外は、実施例３と同様にして抽出液を得た。その後、この抽出液のホウ素量を上記ＩＣＰ法で定量し、澱粉着量を求めた。その結果を図５に示す。
【００２９】
（実施例５）
澱粉糊の塗布量の異なる上記試料サンプルを１ｃｍ角に裁断し、るつぼに入れ、１％炭酸水素ナトリウム水溶液５ｍｌを添加し、１０５℃、２４時間アルカリ処理を行った。その後、３００℃で炭化させ、５８０℃で灰化させた。この灰分を水５ｍｌと共にフラスコに移し、１Ｎ硝酸４５ｍｌを加えて１２０分間、４００ｒｐｍで撹拌し、濾過して抽出液を得た。その際、水５０ｍｌを洗浄水として添加した。その後、この抽出液のホウ素量を上記ＩＣＰ法で定量し、澱粉着量を求めた。その結果を図６に示す。
【００３０】
（比較例１）
澱粉糊の塗布量の異なる上記試料サンプルを１ｃｍ角に裁断し、フラスコに入れ、水１００ｍｌ、０．２重量％α−アミラーゼ溶液３０ｍｌを添加し、よく混合させた後、８０℃乾燥器中に２時間静置した。その後、水５０ｍｌを添加し、Ｎｏ．１濾紙で濾過して抽出液を得た。その際、水５０ｍｌを洗浄水として添加した。得られた抽出液を１１０℃乾燥器中に約１５時間静置して乾燥させた。乾燥後、１２０℃、９０分間で絶乾させ、固形分重量を秤量して澱粉着量を算出した。あらかじめ算出しておいた澱粉着量（実測澱粉着量）とこの酵素法で求められた澱粉着量の関係を図７に示す。
【００３１】
なお、図２〜図７において、□は、一般中しんを用いた場合を示し、●は、強化中しんを用いた場合を示す。
【００３２】
〔結果〕
図１より、発光強度とホウ素標準液の濃度とは直線関係を有するので、ＩＣＰ法を用いて定量が可能であることが明らかとなった。
【００３３】
図２〜図６で示すように、ＩＣＰ法によると、一般中しんを用いた場合であっても、強化中しんを用いた場合であっても、実測澱粉着量とＩＣＰ法による澱粉着量の関係を示す直線は、ほぼ一致又は近似しており、強化中しんに多く含まれる澱粉量の影響は受けていないことが明らかとなった。
【００３４】
これに対し、図７で示すように、実測澱粉着量と酵素法による澱粉着量の関係を示す直線は、一般中しんを用いた場合と、強化中しんを用いた場合でずれが生じており、強化中しんに多く含まれる澱粉量の影響を受けていることが明らかとなった。
【００３５】
【発明の効果】
この発明によれば、ＩＣＰ法でホウ素量を測定するので、接着層に含まれる澱粉量を高精度で、かつ容易に算出することができる。
【００３６】
また、サンプルは、接着層を有する段ボールを切り出すので、実機においても、容易に測定することができる。
【図面の簡単な説明】
【図１】発光強度とホウ素標準液との濃度との関係を有すグラフ
【図２】実測澱粉着量と、水を用いて抽出した抽出液からＩＣＰ法によって測定・算出された澱粉着量との関係を示すグラフ（撹拌処理）
【図３】実測澱粉着量と、水を用いて抽出した抽出液からＩＣＰ法によって測定・算出された澱粉着量のと関係を示すグラフ（超音波処理）
【図４】実測澱粉着量と、アルカリ溶媒を用いて抽出した抽出液からＩＣＰ法によって測定・算出された澱粉着量との関係を示すグラフ（撹拌処理）
【図５】実測澱粉着量と、アルカリ溶媒を用いて抽出した抽出法からＩＣＰ法によって測定・算出された澱粉着量との関係を示すグラフ（超音波処理）
【図６】実測澱粉着量と、灰化法を用いて抽出した抽出液からＩＣＰ法によって測定・算出された澱粉着量との関係を示すグラフ
【図７】実測澱粉着量と従来の酵素法によって測定された澱粉着量との関係を示すグラフ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for measuring the amount of starch-based adhesive used for bonding corrugated cardboard.
[0002]
[Prior art]
Starch glue constituting the adhesive layer of corrugated cardboard is a major element indispensable for corrugated board production. If the amount of starch applied is not appropriate, various problems such as peeling of the inner core and liner, and contamination of the inner core and liner occur. . Therefore, accurately measuring the amount of starch applied is a means necessary for improving the quality of the corrugated cardboard obtained, and is one of the criteria for quality judgment.
[0003]
Currently, methods for measuring the amount of starch deposited on the adhesive layer of corrugated cardboard include an enzymatic method, a method using a tracing agent, or a spectroscopic measurement method. The enzyme method [TAPPI T531 om-81] is a method in which starch paste in cardboard is dissolved in an enzyme solution and filtered, and the extract is dried and the solid content is weighed (H, C, Olsen, Tappi, 55 (7), 1091 (1972)). In addition, the method using the above tracing agent is a method in which a third substance such as a zinc compound or a lithium compound is added as a tracing agent to starch paste, and the amount of the added substance is quantified to determine the starch deposit (CGTrudelle, J. Poustis, International Corrugated Containers Conference, 35 (1993)). Further, the above spectroscopic measurement method is a method of measuring the amount of starch deposited by spectroscopic measurement of a boron complex which is focused on a boron compound in starch paste, dissolved in sulfuric acid after ashing and colored with curcumin ( J. Anic, L. Huybrechts, International Paper Board Industry, 31 (1), 56 (1998)).
[0004]
[Problems to be solved by the invention]
However, when the above enzyme method is used, not only the adhesive layer but also starch present in a large amount in the base paper is weighed at the same time, which causes an error. For example, reinforced medium pods that have been size-pressed with a starch solution contain about 10% starch by weight. When measuring the amount of starch attached to the adhesive layer of the corrugated cardboard constituted by the intermediate sizing, not only the adhesive layer, but also the surrounding central shin and liner are cut out and the amount of starch contained therein is measured. At this time, the amount of starch contained only in the medium shin and the liner is separately measured, and this is used as a blank value to determine the amount of starch attached to the adhesive layer. The blank value will fluctuate. An error occurs due to the fluctuation of the blank value, and the analysis accuracy is lowered.
[0005]
Moreover, when employ | adopting the method using the said tracing agent, it is necessary to manage the addition amount of a tracing agent correctly for every batch, and it is necessary to mix it meticulously at the time of addition. For this reason, there is a problem that it is difficult to cope with an actual machine.
[0006]
Further, when the above-described spectroscopic measurement method is used, there is a problem that the measurement operation is very complicated and requires a long time.
[0007]
Accordingly, an object of the present invention is to provide a method for measuring the amount of starch deposited on an adhesive layer of corrugated cardboard, which is easy to deal with actual machines and measurement operations and has high analysis accuracy.
[0008]
[Means for Solving the Problems]
In the present invention, a boron compound is extracted from a corrugated board having an adhesive layer into a solvent, and the amount of boron contained in the extract is quantified using an emission spectroscopic method using an inductively coupled high-frequency plasma as an excitation source. The above-mentioned problem has been solved by determining the amount of starch contained in the layer.
[0009]
The proportion of boron contained in the starch paste used is approximately constant for each batch of starch paste produced. For this reason, the amount of starch contained in the adhesive layer can be accurately and easily obtained by measuring the amount of boron by the above-mentioned emission spectroscopic analysis method.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
The method for measuring the amount of starch adhering to corrugated cardboard according to the present invention comprises extracting a boron compound from a corrugated cardboard having an adhesive layer into a solvent, and using the inductively coupled high-frequency plasma as an excitation source for the amount of boron contained in the extract. This is a method for determining the amount of starch contained in the adhesive layer by quantitatively using an analysis method (hereinafter abbreviated as “ICP method”).
[0012]
The ICP method measures light emitted when outer electrons such as atoms and ions excited by inductively coupled plasma generated by discharge from an induced current generated in a high frequency induction coil return to a low energy level again. This is a method of qualitatively determining from the position of the line and quantifying from the intensity.
[0013]
Next, a method for preparing a sample subjected to the ICP method will be described.
[0014]
First, a cardboard sample having an adhesive layer for quantitative purposes is cut into a predetermined size. And a solvent, such as water, is added to this and a stirring process or an ultrasonic treatment is performed. Thus, the boron compound in the cardboard sample is extracted into the solvent. Next, this is filtered to obtain an extract. The amount of boron is quantified by measuring this by the ICP method. Then, the amount of starch applied is converted and calculated from the formulation of the paste used for the cardboard.
[0015]
The stirring process is preferably performed at 50 to 1500 rpm. The ultrasonic treatment is preferably performed at an oscillation frequency of 30,000 to 100,000 Hz.
[0016]
In the above method, the extraction operation is performed with a neutral solvent, but an alkaline solvent can be used. In this case, first, an alkali solvent is added to the cardboard sample cut to a predetermined size. And it leaves still for a predetermined time in this state. Then, it is made neutral or acidic with an acid solvent, and a boron compound is extracted by performing stirring treatment or ultrasonic treatment. Thereafter, in the same manner as described above, the starch deposit amount is calculated by conversion. Since boron compounds are easily eluted in alkali, using this method makes it possible to calculate a more accurate amount of starch.
[0017]
Examples of the alkaline solvent include sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate and the like. Examples of the acid solvent include nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, aqueous hydrogen peroxide, hydrogen fluoride, and the like.
[0018]
Furthermore, as a more accurate method of calculating the amount of starch, a method of ashing a cardboard sample can be mentioned. In this case, first, an alkali solvent is added to the cardboard sample cut to a predetermined size. And after standing at 105 degreeC for 24 hours, it is made to ash at 580-900 degreeC. Next, an acid solvent is added to the obtained ashed product to make it neutral to acidic, and a boron compound is extracted by performing a stirring treatment or an ultrasonic treatment. Thereafter, in the same manner as described above, the starch deposit amount is calculated by conversion.
[0019]
According to this ashing method, since the boron compound is isolated by ashing, the extraction becomes easier and a more accurate calculation of the amount of starch can be made.
[0020]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples. First, the used starch paste preparation method, sample sample preparation method, and ICP measurement method will be described.
[0021]
[Preparation of starch paste]
Using corn starch, starch paste was prepared by the Steinhole method. The starch concentration in the obtained starch paste was 22% by weight, the sodium hydroxide concentration was 0.5% by weight, and the borax ratio was 1.8% by weight.
[0022]
[Preparation of sample]
Single-stage test using general medium shin (120 g / m 2 , starch content 3.5 g / m 2 ) or reinforced medium shine (200 g / m 2 , starch content 20 g / m 2 ) cut to 5 × 8.5 cm The starch paste is applied to one side of the shin of a piece (A flute, liner is 280 g / m 2 , starch content is 7.5 g / m 2 ) while changing the coating amount, and weighed immediately before starching. The amount was determined. Next, a liner (280 g / m 2 , starch content 7.5 g / m 2 ) cut to 5 × 8.5 cm was bonded to this at 175 ° C. for 5 seconds. Then, it cut | disconnected in the center part of the middle shin, and only the side bonded with the said starch paste was made into the sample sample.
[0023]
[Quantitative determination of boron by ICP]
A 1000 ppm boron solution for atomic absorption manufactured by Wako Pure Chemical Industries, Ltd. was diluted with pure water to prepare 0.1, 1, 10 ppm boron solutions. This was measured using an ICP measuring apparatus (manufactured by LEEMAN LABS. INC .: JICP-1000V). As a result, as shown in FIG. 1, the emission intensity and the concentration of the boron standard solution were on a straight line, and a calibration curve was obtained.
[0024]
And the amount of boron contained in the extract obtained from each following Example was quantified using the said ICP measuring apparatus, and the amount of starch deposits was calculated | required from this.
[0025]
Example 1
The above sample samples having different starch paste coating amounts were cut into 1 cm squares, placed in 300 ml Erlenmeyer flasks, added with 150 ml of water, stirred for 120 minutes at 400 rpm, and filtered to obtain an extract. At that time, 50 ml of water was added as washing water. Thereafter, the amount of boron in the extract was quantified by the ICP method, and the amount of starch deposited was determined. FIG. 2 shows the relationship between the starch deposition amount calculated in advance (actual starch deposition amount) and the starch deposition amount obtained by this ICP method.
[0026]
(Example 2)
An extract was obtained in the same manner as in Example 1 except that the ultrasonic treatment was performed at 39,000 Hz for 60 minutes instead of stirring. Thereafter, the amount of boron in the extract was quantified by the ICP method, and the amount of starch deposited was determined. The result is shown in FIG.
[0027]
Example 3
The sample samples having different starch paste coating amounts were cut into 1 cm squares, placed in a 300 ml Erlenmeyer flask, added with 50 ml of 1% aqueous sodium hydrogen carbonate solution, and allowed to stand for 1 hour. Then, 50 ml of 1N nitric acid was added, stirred for 120 minutes at 400 rpm, and filtered to obtain an extract. At that time, 50 ml of water was added as washing water. Thereafter, the amount of boron in the extract was quantified by the ICP method, and the amount of starch deposited was determined. The result is shown in FIG.
[0028]
(Example 4)
An extract was obtained in the same manner as in Example 3 except that ultrasonic treatment was performed at 39,000 Hz for 60 minutes instead of stirring. Thereafter, the amount of boron in the extract was quantified by the ICP method, and the amount of starch deposited was determined. The result is shown in FIG.
[0029]
(Example 5)
The sample samples with different starch paste coating amounts were cut into 1 cm squares, placed in a crucible, 5 ml of 1% aqueous sodium hydrogen carbonate solution was added, and alkali treatment was performed at 105 ° C. for 24 hours. Then, it carbonized at 300 degreeC and incinerated at 580 degreeC. The ash was transferred to a flask together with 5 ml of water, 45 ml of 1N nitric acid was added, and the mixture was stirred for 120 minutes at 400 rpm and filtered to obtain an extract. At that time, 50 ml of water was added as washing water. Thereafter, the amount of boron in the extract was quantified by the ICP method, and the amount of starch deposited was determined. The result is shown in FIG.
[0030]
(Comparative Example 1)
The above sample samples having different starch paste coating amounts are cut into 1 cm squares, placed in a flask, added with 100 ml of water and 30 ml of 0.2 wt% α-amylase solution, mixed well, and then placed in an 80 ° C. drier. Let stand for 2 hours. Thereafter, 50 ml of water was added. The extract was obtained by filtering through 1 filter paper. At that time, 50 ml of water was added as washing water. The obtained extract was left to stand in a 110 ° C. dryer for about 15 hours and dried. After drying, it was completely dried at 120 ° C. for 90 minutes, and the weight of the solid content was weighed to calculate the amount of starch. FIG. 7 shows the relationship between the starch deposit amount (measured starch deposit amount) calculated in advance and the starch deposit amount determined by this enzymatic method.
[0031]
2 to 7, □ indicates a case where general medium shin is used, and ● indicates a case where reinforced medium shin is used.
[0032]
〔result〕
From FIG. 1, since the light emission intensity and the concentration of the boron standard solution have a linear relationship, it became clear that the ICP method can be used for quantification.
[0033]
As shown in FIG. 2 to FIG. 6, according to the ICP method, the measured starch deposit amount and the starch deposit amount by the ICP method, regardless of whether general shin or reinforced shin is used. The straight lines indicating the relationship of the above are almost the same or approximated, and it has been clarified that the amount of starch contained in the strengthening shin is not affected.
[0034]
On the other hand, as shown in FIG. 7, the straight line indicating the relationship between the measured starch deposition amount and the starch deposition amount by the enzyme method is different between the case of using general medium shin and the case of using reinforced medium shin. It was clarified that the amount of starch contained in the strengthening shin was affected.
[0035]
【The invention's effect】
According to this invention, since the amount of boron is measured by the ICP method, the amount of starch contained in the adhesive layer can be easily calculated with high accuracy.
[0036]
Moreover, since the sample cuts out the corrugated cardboard having the adhesive layer, it can be easily measured even in an actual machine.
[Brief description of the drawings]
FIG. 1 is a graph showing the relationship between the emission intensity and the concentration of a boron standard solution. Graph showing the relationship between and (mixing process)
FIG. 3 is a graph showing the relationship between the measured starch deposition amount and the starch deposition amount measured and calculated by the ICP method from an extract extracted with water (ultrasonic treatment).
FIG. 4 is a graph showing the relationship between the measured starch deposition amount and the starch deposition amount measured and calculated by the ICP method from an extract extracted with an alkaline solvent (stirring treatment)
FIG. 5 is a graph showing the relationship between the measured starch deposition amount and the starch deposition amount measured and calculated by the ICP method from the extraction method extracted using an alkaline solvent (ultrasonic treatment).
FIG. 6 is a graph showing the relationship between the measured starch deposition amount and the starch deposition amount measured and calculated by the ICP method from the extract extracted using the ashing method. Graph showing the relationship with the amount of starch deposits measured by the method
Claims (4)
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| JP2000188706A JP4404449B2 (en) | 2000-06-23 | 2000-06-23 | Method for measuring the amount of starch on corrugated cardboard |
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| WO2012018032A1 (en) * | 2010-08-02 | 2012-02-09 | 住友化学株式会社 | Method for determining amount of free boric acid |
| US10458964B2 (en) * | 2017-09-29 | 2019-10-29 | Dupont Safety & Construction Inc. | Method for rapidly determining sulfur content in a plurality of samples |
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