CN103759832A - Method for testing and controlling tobacco pulp color shading in process of producing reconstituted tobacco with paper-making method - Google Patents

Abstract

The invention relates to a method for testing and controlling tobacco pulp color shading in the process of producing reconstituted tobacco with a paper-making method. The method is characterized by comprising the steps of tobacco pulp filter cake formation, color scale index measurement and color shading analysis and the like. The method has the advantages that operation is easy, requirements for testing personnel are low, and due to the adoption of the off-line testing method and data analysis software such as Excel, a test result can be obtained fast, negative influences on online production are avoided, and input cost for testing equipment is low.

Description

Test and the control method of tobacco slurry aberration in a kind of papermaking-method reconstituted tobaccos production run

[technical field]

The invention belongs to the production control technical field of papermaking-method reconstituted tobaccos.More specifically, the present invention relates to test and the control method of tobacco slurry aberration in a kind of papermaking-method reconstituted tobaccos production run.

[background technology]

Papermaking-method reconstituted tobaccos is raw materials used for smashed tobacco powder, offal, the cigarette cigarette enterprises such as discarded tobacco leaf excellent, that do not list grade in cannot be for the tobacco waste of production of cigarettes.Papermaking-method reconstituted tobaccos enterprise utilizes the principle of papermaking that these raw material processings are produced to the papermaking-method reconstituted tobaccos that can be used for production of cigarettes.

In the sensory evaluation index of cigarette, the glossiness of cigarette is one of index of differentiating finished cigarettes quality.Papermaking-method reconstituted tobaccos as one of production of cigarettes important source material has strict requirement equally for color and luster.But the color of current papermaking-method reconstituted tobaccos is adopted to qualitative description more, rely on individual sensory evaluation, with significant limitation, easily there is difference and difference to the judgement of assay in this determination methods, is unfavorable for the production control of product.In order to address this problem, someone is (the quantitative test > > of < < papermaking-method reconstituted tobaccos color, tobacco science and technology, o. 11th (total the 268th phase) in 2009) work out according to CIE1976L*a*b* uniform colour space theory, adopt full-automatic colour examining colour-difference-metre, set up the quantitative detecting method of papermaking-method reconstituted tobaccos appearance color.But the application of this method in tobacco produces is not extensive.

And for the chromatism test of tobacco slurry and the method for control, still without any achievement in research targetedly, be in the news at present.The production link of papermaking-method reconstituted tobaccos comprises: extract, concentrated, slurrying, the moulding of manufacturing paper with pulp, coating, oven dry etc.The quality of slurrying has a great impact the color and luster quality of the reconstituted tobacco of producing.Wherein the color and luster of tobacco slurry self also has certain influence to the color and luster of reconstituted tobacco product.In order to test the aberration of the tobacco slurry of papermaking-method reconstituted tobaccos more accurately, and strengthen the control to production run with this, the inventor is through many experiments, finally work out the inventive method, be specially and utilize laboratory copy paper equipment to make filter cake in the online slurry of getting, re-use color colour difference meter it is carried out to chromatism test, test gained L ', a ', b ' value and standard L, a, b value are carried out comparing calculation and are judged that whether slurry aberration is qualified, and according to this slurry aberration in producing are controlled.

[summary of the invention]

[technical matters that will solve]

The test and the control method that the object of this invention is to provide tobacco slurry aberration in a kind of papermaking-method reconstituted tobaccos production run.

[technical scheme]

The present invention is achieved through the following technical solutions.

The test and the control method that the present invention relates to tobacco slurry aberration in a kind of papermaking-method reconstituted tobaccos production run, described method comprises the steps:

(1) form tobacco slurry filter cake

Use moulding bucket with the laboratory page forming machine of vacuum dewatering apparatus, tobacco slurry is poured in the moulding bucket of laboratory page forming machine, carry out negative-pressure vacuum dehydration, until filter cake surrounding is separated with moulding bucket, obtain the filter cake that thickness is not less than 0.5cm, by transfer paper, described filter cake is transferred to operator's console, upwards to be measured by the one side that forming net one side is comparatively smooth;

(2) mensuration of chromaticity index

Use corrected color colour difference meter to measure the colourity of the slurry filter cake of step (1) formation, obtain L ', a ', b ' value;

(3) color difference analysis

Obtain the standard colorimetric of slurry filter cake, described standard colorimetric comprises L, a, b value, the absolute value of L ', a ' that calculating L, a, b value and step (2) obtain, the difference of b ' value, comprise absolute value △ L, a of difference of L and L ' and the absolute value △ b of the absolute value △ a of difference of a ' and the difference of b and b ', according to △ L, △ a and △ b, judge that whether slurry aberration is qualified.

A preferred embodiment of the invention, in step (1), tobacco slurry is the different types of slurry of each workshop section that is selected from tobacco pulp, plus fiber slurry or finished pulp.

According to another kind of preferred implementation of the present invention, in step (1), paper machine moulding mesh number >=80, described laboratory.

According to another kind of preferred implementation of the present invention, the color colour difference meter using in step (2) is L*a*b* type color colour difference meter.

According to another kind of preferred implementation of the present invention, in step (3), according to △ L, △ a and the decision method of △ b to slurry aberration, its criterion is:

(1) if △ is L, △ a, △ b are all less than 1.5 and think slurry aberration indifference;

(2) if △ is L, △ a, △ b have one or several to be greater than 1.5 with the judgement of △ E method, respective formula is as follows:

$\mathrm{\&Delta;E}=\sqrt[2]{\mathrm{\&Delta;}{L}^2+\mathrm{\&Delta;}{a}^2+\mathrm{\&Delta;}{b}^2}$

Wherein, when △ E≤4, think aberration indifference; When △ E>4 aberration there are differences.

According to another kind of preferred implementation of the present invention, when the △ E value obtaining when step (3) is greater than 4, the production workshop section that obtains described tobacco slurry sample should adjust, so that slurry aberration in producing is controlled.

The present invention will be described in more detail below.

The test and the control method that the present invention relates to tobacco slurry aberration in a kind of papermaking-method reconstituted tobaccos production run, described method comprises the steps:

(1) form tobacco slurry filter cake

Use moulding bucket with the laboratory page forming machine of vacuum dewatering apparatus, online got tobacco slurry is poured in the moulding bucket of laboratory page forming machine, open negative pressure and carry out vacuum dehydration, until filter cake surrounding is separated with moulding bucket, form the filter cake that thickness is not less than 0.5cm, by transfer paper, filter cake is transferred to operator's console, upwards to be measured by the one side that forming net one side is comparatively smooth.

Reconstituted tobacco, is called again reconstituted tobacoo, reconstituted tobacco, recombination tobacco leaf, homogeneous tobacco leaf.It is that to utilize discarded offal, tobacco leaf fragment, offal etc. be raw material, through lixiviate, concentrated, separation, making beating, defibrination, manufacture paper with pulp, oven dry, perfuming process process, make the natural tobacco sheet of function admirable, as cigarette filling material, be back to production of cigarettes.Papermaking-method reconstituted tobaccos is to utilize the waste material producing in the production of cigarettes processes such as offal, offal, cigarette rod as producing base stock, use for reference the reconstituted tobacco that paper technology is produced into, have that filling value is high, flammability good, and can save cigarette cost, reduce tobacco leaf planting area.

The tested object of the inventive method comprises the different types of slurry of each workshop section, for example tobacco pulp, plus fiber slurry, finished pulp.The production of reconstituted tobacco roughly comprises that the dipping of tobacco material extracts, concentrated, separation, making beating, defibrination, manufacture paper with pulp, the technological process such as oven dry, perfuming.Wherein a plurality of production links relate to multiple slurry, in process of production the aberration of these slurries are carried out to trace test, can be effectively and control targetedly slurry aberration.Wherein, tobacco slurry is tobacco raw material through high twice dense mill, the slurry of low dense bull ring joint once, and principal ingredient has offal, tobacco fragment, cigarette rod, cigarette etc.; Plus fiber slurry is the slurry of additional pulpboard process hydrabrusher or high dense bull ring joint, and its composition can be wood pulp cellulose or flax fiber etc.; Finished pulp is the slurry producing through link with slurry, and it comprises tobacco slurry, plus fiber slurry and filler.

In the methods of the invention, tobacco slurry samples online, and sample is directly used laboratory paper machine to make slurry filter cake, adopts in this way, rapidly problem identificatioin source.

In this step, the equipment of employing is the conventional laboratory page forming machine using of paper industry, but requires moulding bucket with vacuum dewatering apparatus, for the vacuum dehydration of slurry.

Under normal temperature, pressure ﹣ 0.01～﹣ 0.10MPa condition, slurry carries out vacuum dehydration.These conditions are preferred, and are the known operating conditionss of those skilled in the art, so the inventive method does not limit it.

The inventor studies discovery, and the time of vacuum dehydration is influential to the aberration of slurry.

In the methods of the invention, the slurry filter cake of formation requires its thickness >=0.5cm, this be because.When slurry thickness <0.5cm, colour difference meter there will be exposure phenomenon when measuring, thereby makes measurement result occur deviation.

In the methods of the invention, paper machine moulding mesh number >=80, described laboratory, this be for as far as possible with paper process slice production line on forming net be consistent.

(2) mensuration of chromaticity index

Use corrected color colour difference meter to measure the colourity of the slurry filter cake of step (1) formation, obtain L ', a ', b ' value.

The application foundation of the inventive method is that CIE1976Lab uniform colour space is theoretical.CIE1976Lab(or CIEL*a*b*) chrominance space is the homogeneous color space that International Commission on Illumination in 1976 is recommended, the GB7921-87 of China's issue in 1987 is using LAB space as national standard.At present Color Scheme and the industry such as copy in colour correction, calculating and DTP system, CIELAB space is commonly used.The inventive method application CIE1976Lab carries out apparatus measures and description to the color of the slurry in paper process regeneration leaf tobacco production, and the color measuring and Standard Colors are analyzed, thereby provides foundation for production control.

The slurry filter cake that step (1) obtains makes progress in the comparatively smooth one side of the side by forming net, for color measuring.Why using this one side, is because colour difference meter is in the process of measuring, and need to guarantee the smooth of object under test surface, thereby measure more accurately.

In L*a*b* color specification system, L* value is corresponding to the brightness value of look three elements, colourity a* value from red (+a*) to green (a*) gradual change, b* value is from yellow (+b*) to blue (b*) gradual change, true origin (a*=0, b*=0) be netrual colour point, the coordinate position of a certain color is more away from initial point, and its chroma is larger.While a*, the size of b* value and the tone that ratio has also determined this color.

In this step, need to utilize instrument to measure the colourity of the slurry filter cake of step (1) formation, thereby obtain L ', a ', b ' value.

Wherein, operable instrument is the equipment extensively adopting in tobacco production field, the full-automatic colour examining colour-difference-metre of DC-P3 type that for example the emerging flash ranging look in Beijing instrument company produces.

(3) color difference analysis

The absolute value of L ', a ' that calculating standard L, a, b value and step (2) obtain, the difference of b ' value, be absolute value △ L, a of difference of L and L ' and the absolute value △ b of the absolute value △ a of difference of a ' and the difference of b and b ', according to △ L, △ a and △ b, judge that whether slurry aberration is qualified, and according to this slurry aberration in producing is controlled.

Wherein, calculate standard L, a, b value to measuring with the corresponding slurry of batch specification product on paper process slice production line.

The absolute value of L ', a ' that calculating standard L, a, b value and step (2) obtain, the difference of b ' value.That is:

△L=|L-L’|

△a=|a-a’|

△b=|b-b’|

When △ L, △ a, △ b are all less than 1.5, can think slurry aberration indifference.

Why adopting 1.5 here as standard, is because the value in △ L, △ a, △ b is greater than 1.5, naked eyes can obviously feel L, a, b the variation of corresponding aberration degree.

When △ L, △ a, △ b have one or several to be greater than 1.5, with △ E method, judge.The computing formula of △ E is as follows:

$\mathrm{\&Delta;E}=\sqrt[2]{\mathrm{\&Delta;}{L}^2+\mathrm{\&Delta;}{a}^2+\mathrm{\&Delta;}{b}^2}$

Wherein, when △ E≤4, think aberration indifference; When △ E>4 aberration there are differences.

Then can judge whether to adjust production run according to △ E,, when △ E value is greater than 4, the production workshop section that obtains described tobacco slurry sample should adjust, so that slurry aberration in producing is controlled.Why adopting 4 here as standard, is because value in △ E is while being greater than 4, and naked eyes can obviously be felt the variation of whole aberration.

Wherein, data processing and mapping can adopt MicrosoftExcel to carry out, and also can adopt other process software to carry out.Data processing method does not limit in the methods of the invention.

[beneficial effect]

For in existing papermaking-method reconstituted tobaccos production run, the weak link of tobacco slurry chromatism test having been proposed to solution, test result can be fed back in time, help relevant each process section to regulate in time, the problem that has reduced the product color disqualification rate rising being caused by the fluctuation of slurry aberration, has effectively improved product quality.Method of testing is simple to operation, to tester, requires lower.Because the method adopting is off-line test method, and combine the data analysis software such as Excel, can obtain fast testing result, and can not cause harmful effect to online production, checkout equipment input cost is lower.

[accompanying drawing explanation]

Fig. 1 represents the relation between filter cake solid content and aberration.

[embodiment]

Embodiment 1:

The front slurry A of online and the three grades of corresponding defibrination material B that obtain online certain specification product, used described method to test, and in filter cake preparation process, under identical negative pressure, to the same different time of batch de-watering of slurries, result is as shown in table 1.

The filter cake aberration of table 1. different water cut

RSD computing formula:

$S=\sqrt{\frac{\mathrm{\&Sigma;}{(x_i-\stackrel{\&OverBar;}{x})}^2}{N-1}}$

S is relative standard deviation (RSD), x _ifor the value of chromatism of sample, for the mean value of sample value of chromatism, N is sample number.

Wherein, the L of slurry A, a, b standard value are 40.60,6.62,20.46, and the L of slurry B, a, b standard value are 37.90,6.85,18.36.

This standard value is to get above-mentioned slurry A, B under the condition of normal temperature, pressure ﹣ 0.01～﹣ 0.10MPa, 80 order forming nets, dewatering time 120s, by calculating L, a of 100 groups of slurries, the mean value of b value obtains.

As can be seen from Table 1, the relative standard deviation RSD of actual test value is all less than 1.5%, and test data is reliable, and the relation between filter cake solid content and aberration is carried out to mapping analysis, and result as shown in Figure 1.

As shown in Figure 1, the slope of slurry A and slurry B aberration L, a, b value fitting a straight line is all less than 0.02 close to 0, can think filter cake solid content in 8.86～9.78% scopes on aberration L, a, b value substantially without impact, and the extreme difference of his-and-hers watches 1 two kinds of L that slurry is surveyed, a, b value be less than 0.30 also illustrate within the scope of this filter cake moisture content on slurry aberration without impact.

Embodiment 2:

Whether finished product slurry and the tobacco slurry of obtaining respectively the different trades mark are used described method to test, and qualified with standard colors deviation testing slurry aberration, and test result is as shown in table 2.

Table 2. standard colors difference and comparing result

Wherein, the finished pulp of products C, the L of tobacco pulp, a, b standard value are 46.55,6.00,15.33 and 32.00,5.22,12.11, the finished pulp of product D, the L of tobacco pulp, a, b standard value are 56.19,6.05,18.84 and 38.89,5.79,19.55, and the finished pulp of product E, the L of tobacco pulp, a, b standard value are 45.03,7.33,23.54 and 39.12,7.10,19.99.

This standard value is to get the finished pulp of specification product C, D, E, tobacco pulp under the condition of normal temperature, pressure ﹣ 0.01～﹣ 0.10MPa, 80 order forming nets, dewatering time 120s, by calculating L, a of 100 groups of slurries, the mean value of b value obtains.

As shown in Table 3, the relative standard deviation RSD of test value is all less than 1.5%, and test data is reliable.By test result and its standard colors difference comparing calculation, the finished pulp of products C, D, tobacco pulp aberration are all qualified, the △ E value of product E finished pulp is greater than 4, therefore it is defective that the finished pulp aberration of product E detects, and the △ L of product E tobacco pulp, △ a, △ b are all≤1.5, the tobacco pulp aberration of product E is qualified, can infer that according to this causing the underproof workshop section of product E finished pulp aberration is the workshop section with slurry between finished pulp and tobacco pulp.

Claims (6)

1. a method of testing for tobacco slurry aberration in papermaking-method reconstituted tobaccos production run, is characterized in that described method comprises the steps:

(1) form tobacco slurry filter cake

Use moulding bucket with the laboratory page forming machine of vacuum dewatering apparatus, tobacco slurry is poured in the moulding bucket of laboratory page forming machine, carry out negative-pressure vacuum dehydration, until filter cake surrounding is separated with moulding bucket, obtain the filter cake that thickness is not less than 0.5cm, by transfer paper, described filter cake is transferred to operator's console, upwards to be measured by the one side that forming net one side is comparatively smooth;

(2) mensuration of chromaticity index

Use corrected color colour difference meter to measure the colourity of the slurry filter cake of step (1) formation, obtain L ', a ', b ' value;

(3) color difference analysis

Obtain the standard colorimetric of slurry filter cake, described standard colorimetric comprises L, a, b value, the absolute value of L ', a ' that calculating L, a, b value and step (2) obtain, the difference of b ' value, comprise absolute value △ L, a of difference of L and L ' and the absolute value △ b of the absolute value △ a of difference of a ' and the difference of b and b ', according to △ L, △ a and △ b, judge that whether slurry aberration is qualified.

2. method according to claim 1, is characterized in that in step (1), and tobacco slurry is the different types of slurry of each workshop section that is selected from tobacco pulp, plus fiber slurry or finished pulp.

3. method according to claim 1, is characterized in that in step (1), paper machine moulding mesh number >=80, described laboratory.

4. method according to claim 1, is characterized in that the color colour difference meter using in step (2) is L, a, b type color colour difference meter.

5. method according to claim 1, is characterized in that in step (3) that, according to △ L, △ a and the decision method of △ b to slurry aberration, its criterion is:

(1) if △ is L, △ a, △ b are all less than 1.5 and think slurry aberration indifference;

(2) if △ is L, △ a, △ b have and be one or morely greater than 1.5 and judge with △ E method, respective formula is as follows:

$\mathrm{\&Delta;E}=\sqrt[2]{\mathrm{\&Delta;}{L}^2+\mathrm{\&Delta;}{a}^2+\mathrm{\&Delta;}{b}^2}$

Wherein, when △ E≤4, think aberration indifference; When △ E>4 aberration there are differences.

6. method according to claim 6, is characterized in that when △ E value is greater than 4, adjusts, so that slurry aberration in producing is controlled to obtaining the production workshop section of described tobacco slurry sample.

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