阅读说明：本技术 一种造纸法再造烟叶浆料质量稳定性的表征方法 (characterization method for quality stability of paper-making reconstituted tobacco slurry ) 是由 胡念武 喻世涛 唐向兵 于 2018-06-08 设计创作，主要内容包括：本发明提供一种造纸法再造烟叶浆料质量稳定性的表征方法,首先将一个浆料批次时间等间隔地分成T(T≥3)个时间段,按时间顺序构成T+1个取样时间点；再对i时点样品的打浆度、湿重、保水值、数均长度、重均长度、宽度进行测定；最后计算一个批次时间范围内的指标变异系数平均值,根据变异系数平均值,即可判定造纸法再造烟叶浆料质量的稳定性。本发明采用打浆度、湿重、保水值、数均长度、重均长度、宽度等6项指标的变异系数平均值,能够更加全面、系统地表征造纸法再造烟叶浆料的质量稳定性。(the invention provides a method for characterizing the quality stability of paper-making reconstituted tobacco pulp, which comprises the steps of firstly dividing a pulp batch into T (T is more than or equal to 3) time periods at equal intervals, and forming T +1 sampling time points according to a time sequence; then measuring the beating degree, wet weight, water retention value, number average length, weight average length and width of the sample at the point i; and finally, calculating the average value of the index variation coefficients within a batch time range, and judging the quality stability of the paper-making reconstituted tobacco pulp according to the average value of the variation coefficients. The invention adopts the average value of the variation coefficient of 6 indexes such as the beating degree, the wet weight, the water retention value, the number average length, the weight average length, the width and the like, and can comprehensively and systematically represent the quality stability of the paper-making reconstituted tobacco pulp.)

1. A characterization method for quality stability of paper-making reconstituted tobacco slurry is characterized by comprising the following steps: firstly, dividing a slurry batch into T (T is more than or equal to 3) time periods at equal intervals, and forming T +1 sampling time points according to a time sequence; then measuring the beating degree, wet weight, water retention value, number average length, weight average length and width of the sample at the point i; and finally, calculating the average value of the index variation coefficients in a batch time range, wherein the method specifically comprises the following steps:

(1) a, B, C, D, E, F are respectively used for expressing 6 indexes of the beating degree, the wet weight, the water retention value, the number average length, the weight average length and the width, and the average value of the 6 indexes is calculated:

in the formula (1), X represents A, B, C, D, E, F;

(2) The standard deviation of 6 indexes is calculated respectively:

In the formula (2), the standard deviation of the index of 6 items is shown;

(3) the coefficient of variation of 6 indexes is calculated respectively:

(4) Calculating the average value of the variation coefficients of the 6 indexes:

U＝(CV_A+CV_B+CV_C+CV_D+CV_E+CV_F)/6 (4)

(5) and (4) judging the stability of the quality of the paper-making reconstituted tobacco pulp according to the average value U of the variation coefficient.

2. the characterization method of the quality stability of the paper-making reconstituted tobacco pulp according to claim 1, characterized in that: and (5) if the average value U of the variation coefficients is in the range of 0-0.1, judging that the stability is good, otherwise, judging that the stability is poor.

Technical Field

The invention relates to the technical field of tobacco manufacturing, in particular to a characterization method for quality stability of paper-making reconstituted tobacco slurry.

Background

The domestic paper-making method reconstituted tobacco is usually produced by adopting a two-step method, the effective components of tobacco are fully soaked by adopting a solvent, then the tobacco extract is concentrated and backfilled on a tobacco substrate, and the key production procedures comprise the processes of extraction, concentration, pulping, papermaking, coating and the like. Pulping comprises two parts: firstly, the extracted tobacco raw material is pulped, and the aim is to improve the uniformity of the tobacco substrate; and secondly, the added fiber is pulped, so that the physical strength of the tobacco substrate is improved. The quality evaluation of the mixed slurry obtained in the pulping process is mainly carried out by adopting two indexes of the pulping degree and the wet weight at present. However, the fiber properties of the tobacco raw material and the added fiber are very different, and it is difficult to fully evaluate the quality of the mixed slurry only by the two indexes. In the actual production process, small fluctuation of the beating degree and the wet weight often occurs, and the situation that the difference of the wet weight is large under the condition of the same beating degree also occurs. These instability factors directly affect the quality control level of the following paper making section. Therefore, when the quality of the slurry is evaluated, some additional evaluation parameters are necessary to be introduced to measure the stability of the slurry.

Chinese patent 'A paper-making process reconstituted tobacco slurry uniformity degree characterization method' (application number: 201310750057.9) discloses a method for characterizing slurry uniformity degree by detecting net surfing concentration and concentrated white water concentration at different moments and calculating variation coefficients thereof; chinese patent 'characterization method of uniformity of size based on dryness of paper-making reconstituted tobacco size' (application number: 201611149104.4) discloses a method for characterizing the uniformity of size by detecting the net-feeding concentration and the concentration of concentrated white water at different moments and calculating the variation coefficient of the net-feeding concentration and the concentration of the concentrated white water.

however, the above patent is only considered from the aspect of slurry concentration, and the paper-making reconstituted tobacco slurry is a mixture of fibers with various properties, so that it is difficult to fully evaluate the quality of the slurry.

The method provided by the invention.

disclosure of Invention

The invention provides a method for representing the quality stability of paper-making reconstituted tobacco pulp, which can comprehensively and systematically represent the quality stability of the paper-making reconstituted tobacco pulp by adopting the average value of variation coefficients of 6 indexes such as beating degree, wet weight, water retention value, number average length, weight average length, width and the like.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for characterizing the quality stability of paper-making reconstituted tobacco pulp comprises the steps of dividing a pulp batch into T (T is more than or equal to 3) time periods at equal intervals, and forming T +1 sampling time points according to a time sequence; then measuring the beating degree, wet weight, water retention value, number average length, weight average length and width of the sample at the point i; and finally, calculating the average value of the index variation coefficients in a batch time range, wherein the method specifically comprises the following steps:

(1) A, B, C, D, E, F are respectively used for expressing 6 indexes of the beating degree, the wet weight, the water retention value, the number average length, the weight average length and the width, and the average value of the 6 indexes is calculated:

In the formula (1), X represents A, B, C, D, E, F;

(2) The standard deviation of 6 indexes is calculated respectively:

In the formula (2), X_stStandard deviation representing 6 indices;

(3) The coefficient of variation of 6 indexes is calculated respectively:

(4) Calculating the average value of the variation coefficients of the 6 indexes:

U＝(CV_A+CV_B+CV_C+CV_D+CV_E+CV_F)/6 (4)

(5) and (4) judging the stability of the quality of the paper-making reconstituted tobacco pulp according to the average value U of the variation coefficient.

Further, in the step (5), if the average value U of the coefficient of variation is within the range of 0 to 0.1, the judgment stability is good, otherwise, the judgment stability is poor.

the invention has the advantages that: the method is simple and easy to implement, and the average value of the variation coefficients of 6 indexes such as the beating degree, the wet weight, the water retention value, the number average length, the weight average length and the width is adopted, so that the quality stability of the paper-making reconstituted tobacco pulp can be comprehensively and systematically represented.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to the specific embodiments.