CN104568828A - Method for determining tensile strength of reproduced tobacco leaves of papermaking method by near-infrared diffuse reflection spectrum - Google Patents
Method for determining tensile strength of reproduced tobacco leaves of papermaking method by near-infrared diffuse reflection spectrum Download PDFInfo
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Abstract
The invention discloses a method for determining the tensile strength of reproduced tobacco leaves of a papermaking method by a near-infrared diffuse reflection spectrum. The method comprises the following steps: (1) collecting and preparing a sheet-shaped sample with representativeness; (2) collecting an original spectrum; (3) selecting a correction sample set and a verification sample set; (4) determining a sample reference value; (5) pre-treating the spectrum; (6) establishing a PLS model; (7) verifying the model; and (8) determining the tensile strength. The method disclosed by the invention is simple, feasible and rapid; the analysis efficiency can be improved and the cost is saved by adopting a near-infrared spectrum nondestructive testing technology; the detection efficiency for accurately determining the tensile strength of the reproduced tobacco leaves is improved; and the product quality is objectively reflected and the practicability is obvious. The method has the advantages of rapid detection speed, no pollution, greenness and environmental pollution, high accuracy, good repeatability and the like, and is suitable for field analysis and rapid detection of the tensile strength of the reproduced tobacco leaf products, and online monitoring of the fluctuation of the product quality.
Description
Technical field
The present invention relates to the method that near-infrared diffuse reflection spectrum technology measures papermaking-method reconstituted tobaccos tensile strength, belong to papermaking-method reconstituted tobaccos field.
Background technology
Papermaking-method reconstituted tobaccos is by means of paper technology and equipment, utilize the tobacco wastes such as the broken end of offal, cigarette and fragment as body material, through reconfiguring the product processed, effectively make use of tobacco waste, production of cigarettes cost can be reduced, promote cigarette product lowering harm and decreasing coking, improve suction quality, promote the integrated quality of cigarette product.
The tensile strength of papermaking-method reconstituted tobaccos is one of its important physical index, and tensile strength refers to that, under test method defined terms, the maximum tension that can bear before the sample fracture of unit width, represents with kN/m.Papermaking-method reconstituted tobaccos is that the coating process meeting the later stage should possess certain tensile strength, but tensile strength is too high is unfavorable for follow-up silk producing procedures, so the tensile strength of reconstituted tobacco should within the specific limits, to ensure that satisfied coating needs are unlikely to again to affect its processing characteristics.At present, the papermaking-method reconstituted tobaccos tensile strength detection method that industry standard YC/T 16-2014 specifies continues to use the detection method of paper, the specimen size needed comparatively large (200mm × 15mm), need the tensile strength measuring vertical and horizontal respectively, test clip is apart from being 100mm, and the method only can meet reconstituted tobacco manufacturing enterprise and the production division reconstituted tobacco to non-cutting to a certain extent and detect and the requirement of quality inspection.But for reconstituted tobacco finished product, due to size less and be difficult to differentiate in length and breadth to, the detection method of standard is obviously inapplicable.Standard Q/YNZY.J04.401-2014 specifies the tensile strength need≤1.0kN/m of reconstituted tobacco, standard Q/YNZY.J07.403-2014 defines the assay method of reconstituted tobacco finished product tensile strength, cut the rectangular sample of the rectangle of getting 40mm × 15mm, a sample need measure the data of 30 samples.But reconstituted tobacco product has horizontal and vertical dividing, utilize the tensile strength of the horizontal and vertical reconstituted tobacco of this standard test can be variant, the product of the part trade mark due to its singularity cut after reconstituted tobacco product be difficult to distinguish laterally with longitudinally, so the tensile strength measured has deviation.Meanwhile, distinguished before mensuration reconstituted tobacco tensile strength and laterally with longitudinally expend time in, determination efficiency is reduced, is difficult to meet fast, the demand of on-line determination.Given this, be necessary to develop a kind of method measuring tensile strength fast newly, the tensile strength for assay reconstituted tobacco provides certain reference.
After near infrared light to material, can absorb, transmission, total reflection, several interaction type such as diffuse reflection.The acquisition mode of near infrared spectrum mainly contains three kinds: transmission-type, diffuse reflection type, thoroughly diffuse type.
For the good fluid sample of light penetrability, near infrared light can penetrate whole sample, and the transmission mode that adopts carries out spectral scan more, and measured data are comparatively accurate.Near infrared light can not penetrate papermaking-method reconstituted tobaccos completely, therefore adopts diffuse reflectance to carry out spectral scan.After near-infrared diffuse reflection enters sample interior, occur to reflect many times, reflect, diffraction, after absorption, return the light of the plane of incidence, the structure of this analysis light load sample and composition information, it is quick, an environment amenable detection technique, current application near infrared reflectance spectroscopy measures the aspects such as tobacco components, style, homogeneity and has been reported, but has no report for the method for measuring of papermaking-method reconstituted tobaccos tensile strength.
Summary of the invention
For simple, easy, Fast Measurement reconstituted tobacco tensile strength, the invention provides a kind of method of near infrared ray papermaking-method reconstituted tobaccos tensile strength, near infrared spectrum Dynamic Non-Destruction Measurement is adopted not only to improve analysis efficiency, cost-saving, for Accurate Determining reconstituted tobacco tensile strength, improve detection efficiency, objective reactor product quality, has obvious practicality.
The present invention is realized by following technical proposal: a kind of near-infrared diffuse reflection spectrum technology measures the method for papermaking-method reconstituted tobaccos tensile strength, comprises the steps:
Step (1), the collection of sample: collect a collection of representative papermaking-method reconstituted tobaccos sheet products;
Step (2), gathers original spectrum: adopt the irreflexive mode of near infrared spectrum to carry out spectral scan one by one to the papermaking-method reconstituted tobaccos sheet products that step (1) is collected, obtain original spectrum;
Step (3), selects Calibration and verification sample collection: in step (2) gained original spectrum, adopt the method for standard GB/T 29858-2013 to select Calibration and verification sample collection;
Step (4), working sample reference value: at the standard conditions, utilizes standard method to carry out the mensuration of tensile strength one by one to the papermaking-method reconstituted tobaccos sheet products that step (1) is collected, obtains samples Reference value;
Step (5), pre-processed spectrum: pre-service is carried out, the impact of stress release treatment and baseline wander to the spectrum of the Calibration selected in step (3) and verification sample collection;
Step (6), set up PLS model: step (5) pretreated Calibration and step (4) gained samples Reference value are carried out one_to_one corresponding, application partial least square method carries out matching tensile strength determination data corresponding with it for spectroscopic data, set up quantitative model, carry out in modeling process detecting and rejecting abnormalities value, remaining spectra values is worth to rejecting abnormalities, again carry out one_to_one corresponding with step (4) gained samples Reference value, application partial least square method carries out matching tensile strength determination data corresponding with it for spectroscopic data, set up the quantitative model obtaining tensile strength index,
Step (7), modelling verification: the quantitative model of the tensile strength index that the verification sample set pair step (6) after utilizing step (5) to process is set up carries out external prediction;
Step (8), measures tensile strength: by the quantitative model of the tensile strength index that the original spectrum input step (6) of papermaking-method reconstituted tobaccos sample to be measured is set up, and namely measures and obtains tensile strength.
Further, the spectra collection condition of described step (2) is: sweep limit is 4000 ~ 10000cm
-1, resolution is 8cm
-1, scanning times is not less than 72 times.
Further, the original spectrum of described step (2) is obtained by following method: papermaking-method reconstituted tobaccos sheet products step (1) collected, each product gets five Duplicate Samples, each Duplicate Samples 10 ~ 15 samples, make the sample mated with near infrared spectrum Special sample cup size, 10 ~ 15 samples are laid in sample cup successively, ensure the smooth placement of sample, thickness is 2 ~ 3cm, after gently flattening with sample-pressing device, be put on spectrometer universal stage, near infrared spectrum is utilized to adopt irreflexive mode to carry out scanning and gathering spectrum, each Duplicate Samples sweeps a spectrum, corresponding 5 the parallel spectrum of each product, again 5 parallel spectrum (with near infrared spectroscopy instrument carry software) are carried out being averaging and obtain an original spectrum, identical method is adopted to scan and gather spectrum to each product successively, obtain the original spectrum that each product is corresponding.Getting more than 10 samples is that measured spectral information more can represent most of sample information, thus farthest retains primary data information (pdi), ensures the Stability and veracity of institute's established model in order to make the representativeness of sample better.
Further, the standard conditions of described step (4) are GB/T 16447 " atmospheric environment that tobacco and tobacco product regulate and test " defined terms; Described standard method refers to be tested by standard Q/YNZY.J07.403-2014 " mensuration of papermaking-method reconstituted tobaccos tensile strength ".
Above-mentioned standard method measures the papermaking-method reconstituted tobaccos finished product of cutting, regulate rear cutting means, cut the rectangular rectangular sample getting 40 mm × 15 mm, 30 intact samples chosen by sample, rate of extension to 200 mm/min ± 0.5 mm/min of adjustment tensile strength test instrument, Adjustment Tests folder is apart from being 20 mm ± 0.1 mm, and the net result of a sample represents with the arithmetic mean of 30 Specimen Determination results, calculates according to the following formula:
S is sample tensile strength,
for sample mean tension stress, W is specimen width.
Further, the pre-service of described step (5) refers to, centralization smoothing to original spectrum and first order derivative pre-service.
Further, in described step (6), detection and rejecting abnormalities value adopt the method detecting lever value, especially by the following step:
By following formulae discovery sample lever value:
Wherein,
h i for sample lever value,
t i for sample
ibecause of subvector,
t t tfor the factor score matrix of modeling collection,
t t i for
t i transposition;
When sample lever value is greater than 3k/n, wherein k is number of principal components, and n is sample number, and its spectrum has significant impact to recurrence, should reject.
Further, the modelling verification of described step (7) adopts the predicted value of the quantitative model gained of t method of inspection determination verification sample collection input step (6) and corresponding step 4 gained samples Reference value whether to have deviation in statistical significance: namely, the predicted value of the quantitative model of tensile strength index step (6) set up and the samples Reference value t value of step (4) and degree of freedom d
v-1critical value t
(a, dv-1)compare, get level of signifiance a=0.05, when | t| < t
(a, dv-1), during probability P >0.05, illustrate that the testing result of two kinds of methods does not exist significant difference, modelling verification success, this model can be used for the tensile strength measuring papermaking-method reconstituted tobaccos.
PLS model is the development of principal component regression bearing calibration (PCR).In principle component regression, by certain main cause subnumber, spectrum matrix is decomposed.To reach the object that Data Dimensionality Reduction eliminates garbage (noise).And in PLS regretional analysis, except spectrum matrix is decomposed, also decomposition dimensionality reduction is carried out to concentration matrix, and introduce mutual information simultaneously.Its principle is as follows:
(1) model of matrix decomposition is:
Am×p=Tm×kPk×p+EA
Cm×n=Um×kQk×n+EC
Wherein, A is spectrum matrix; C is concentration or character matrix; T is the score matrix of spectrum matrix; U is the score matrix of concentration matrix; P is the loading matrix-major component matrix of spectrum matrix; Q is the loading matrix-major component matrix of concentration matrix; EA is the spectral error matrix of application PLS introducing when carrying out regretional analysis; EC is the concentration error matrix of application PLS introducing when carrying out regretional analysis; M is sample number; P is number of wavelengths; K is number of principal components.
(2) regretional analysis of score matrix T, U, obtains correlation matrix B
Um×k=Tm×fBk×k
(3) when forecast analysis, the loading matrix P obtained by the unknown Sum decomposition of the spectrum matrix A of sample by Am × p=Tm × kPk × p+EA, the score matrix T obtaining sample is unknown, is obtaining the concentration of unknown sample according to the unknown BQ of C the unknown=T.
The present invention compared with prior art, its beneficial effect is: the invention provides the method that near-infrared diffuse reflection spectrum technology measures papermaking-method reconstituted tobaccos tensile strength, simply, easy, quick, near infrared spectrum Dynamic Non-Destruction Measurement is adopted to improve analysis efficiency, cost-saving, for Accurate Determining reconstituted tobacco tensile strength, improve detection efficiency, objective reactor product quality, has obvious practicality.It is fast that the inventive method has detection speed, pollution-free, environmental protection, and accuracy is high, high repeatability and other advantages, is applicable to the on-line monitoring realizing on-the site analysis, fast detection and products thereof quality fluctuation of reconstituted tobacco product tensile strength.For stability contorting papermaking-method reconstituted tobaccos product interior quality, play papermaking-method reconstituted tobaccos stable roll smoke product quality and mould cigarette style there is obvious beneficial effect.
A. analysis speed is fast: measure in a sample 3min and complete, can the tensile strength of rapid test reconstituted tobacco product by the tensile strength model set up, and the fluctuation situation of preliminary judgement sample quality;
B. belong to non-destructive analysis technology: collect without the need to damaging sample and need not carrying out the pre-treatments such as grind away after sheet products, not lesioned sample in near-infrared spectral measurement process, all can not have an impact to sample from outward appearance to inside;
C. analysis cost is low, pollution-free: in sample analysis process, do not consume sample itself, need not any chemical reagent, and cost reduces, and does not cause any pollution to environment;
D. scanning samples is sheet, does not need pre-treatment, easy and simple to handle;
E. test favorable reproducibility: spectroscopic assay is less by interference from human factor, measure and there is stability;
F. be convenient to realize on-line analysis: near infrared spectrum has good transport property in a fiber, sample, without the need to pre-treatment, just can realize on-line analysis and remote monitoring.
Accompanying drawing explanation
Fig. 1 sets up by step (6) the data fitting figure of the quantitative model of tensile strength index.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.It will be understood to those of skill in the art that the following example only for illustration of the present invention, and should not be considered as limiting scope of the present invention.Unreceipted concrete technology or condition person in embodiment, according to the technology described by the document in this area or condition or carry out according to product description.Agents useful for same or the unreceipted production firm person of instrument, being can by buying the conventional products obtained.
Step (1), the collection of sample: collect a collection of representative papermaking-method reconstituted tobaccos sheet products 250 ~ 300;
Step (2), gather original spectrum: papermaking-method reconstituted tobaccos sheet products step (1) collected, each product gets five Duplicate Samples, each Duplicate Samples 10 ~ 15 samples, make the sample mated with near infrared spectrum Special sample cup size, 10 ~ 15 samples are laid in sample cup successively, ensure the smooth placement of sample, thickness is 2 ~ 3cm, after gently flattening with sample-pressing device, be put on spectrometer universal stage, utilize near infrared spectrum to adopt irreflexive mode to carry out scanning and gathering spectrum under following spectral conditions: sweep limit is 4000 ~ 10000cm
-1, resolution is 8cm
-1, scanning times is not less than 72 times; Each Duplicate Samples sweeps a spectrum, corresponding 5 the parallel spectrum of each product, again 5 parallel spectrum (with near infrared spectroscopy instrument carry software) are carried out being averaging and obtain an original spectrum, adopt identical method scan and gather spectrum to each product successively, obtain the original spectrum that each product is corresponding;
Step (3), selects Calibration and verification sample collection: in step (2) gained original spectrum, adopt the method for standard GB/T 29858-2013 to select Calibration and verification sample collection;
Step (4), working sample reference value: under standard conditions (GB/T 16447 " atmospheric environment that tobacco and tobacco product regulate and test " defined terms), utilize standard method (standard Q/YNZY.J07.403-2014 " mensuration of papermaking-method reconstituted tobaccos tensile strength ") the papermaking-method reconstituted tobaccos sheet products that step (1) is collected to be carried out one by one to the mensuration of tensile strength, obtain samples Reference value; Above-mentioned standard method is specific as follows: measure the papermaking-method reconstituted tobaccos finished product of cutting, regulate rear cutting means, cut the rectangular rectangular sample getting 40 mm × 15 mm, 30 intact samples chosen by sample, rate of extension to 200 mm/min ± 0.5 mm/min of adjustment tensile strength test instrument, Adjustment Tests folder is apart from being 20 mm ± 0.1 mm, and the net result of a sample represents with the arithmetic mean of 30 Specimen Determination results, calculates according to the following formula:
S is sample tensile strength,
for sample mean tension stress, W is specimen width;
Step (5), pre-processed spectrum:, centralization smoothing to the spectrum of Calibration in step (3) and verification sample collection and first order derivative pre-service, the impact of stress release treatment and baseline wander;
Step (6), set up PLS model: select, in full spectral range, PLS is carried out to calibration set sample and return and full cross validation, when the number of principal components of model reaches 2, the root mean square cross validation error RMSECV of model is minimum, and the optimum number of principal components of preference pattern is 2.Step (5) pretreated Calibration and step (4) gained samples Reference value are carried out one_to_one corresponding, application partial least square method carries out matching tensile strength determination data corresponding with it for spectroscopic data, set up quantitative model, in modeling process, adopt the method detecting lever value to carry out detecting and rejecting abnormalities value:
By following formulae discovery sample lever value:
Wherein,
h i for sample lever value,
t i for sample
ibecause of subvector,
t t tfor the factor score matrix of modeling collection,
t t i for
t i transposition;
When sample lever value is greater than 3k/n, wherein k is number of principal components, and n is sample number, and its spectrum has significant impact to recurrence, should reject; By calculate in steps in (3) the spectrum lever value of Calibration and verification sample collection be all less than 3k/n, do not have abnormal sample to need to reject;
Remaining spectra values is worth to rejecting abnormalities, again carry out one_to_one corresponding with step (4) gained samples Reference value, application partial least square method carries out matching tensile strength determination data corresponding with it for spectroscopic data, set up the quantitative model (see figure 1) obtaining tensile strength index, the related coefficient of quantitative model is 0.8054, RMSECV is 0.0154, have significant linear relationship between visible spectrum data and the index quantification of sample, the near infrared spectrum of interpret sample includes the closely-related information with index quantification;
Step (7), modelling verification: the quantitative model of 50 products to the tensile strength index that step (6) is set up that the verification sample after utilizing step (5) to process is concentrated carries out external prediction: by following formulae discovery root-mean-square prediction error RMSEP:
Wherein,
d i f i =x
i-y
ibe i-th sample near infrared measured value x
iwith as this sample reference value y analyzing benchmark
idifference, utilizing formulae discovery to obtain root-mean-square prediction error RMSEP is 0.0102, table 1 predicts the outcome for PLS model prediction collection, the predicted value of quantitative model gained of t method of inspection determination verification sample collection input step (6) and corresponding step 4 gained samples Reference value is adopted whether to have deviation in statistical significance: namely, the predicted value of the quantitative model of tensile strength index step (6) set up and the samples Reference value t value of step (4) and degree of freedom d
v-1critical value t
(a, dv-1)compare, get level of signifiance a=0.05, t value is found according to 95% fiducial interval, t
0.05,49=2.009, then | t| < t
0.05,49, during probability P >0.05, illustrate that the testing result of two kinds of methods does not exist significant difference, modelling verification success, this model can be used for the tensile strength measuring papermaking-method reconstituted tobaccos, reliable results:
Table 1 PLS model prediction collection predicts the outcome
Step (8), measures tensile strength: by the quantitative model of the tensile strength index that the original spectrum input step (6) of 10, papermaking-method reconstituted tobaccos sample to be measured is set up, and namely measures and obtains tensile strength; Each sample predicts 5 times, the standard method of applying step (4) simultaneously measures sample tensile strength, its measurement result is as shown in table 2 below, and it is feasible in production practices, applying near-infrared diffuse reflection spectrum as seen from Table 2 to the detection of reconstituted tobacco weight per unit length.
Table 2 actual sample measurement result
In sum, utilize this model can measure the tensile strength of reconstituted tobacco finished product fast and accurately, to the fluctuation situation realizing on-the site analysis, monitoring reconstituted tobacco constant product quality and quality, significant.
In addition, why the pre-service of step (5) adopts smoothly, centralization and first order derivative pre-service, as following table 3 by the PLS model result of Calibration under different Pretreated spectra, visible, different preprocessing procedures has different impacts to PLS modeling result, centralization and first order derivative effect are better, finally adopt level and smooth, centralization and first order derivative pre-service, and smoothly counting is 3:
PLS model result under the different Pretreated spectra of table 3
Note: in table, k is number of principal components, RMSECV is root mean square cross validation error.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.Those skilled in the art should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof
.
Claims (6)
1. near-infrared diffuse reflection spectrum technology measures a method for papermaking-method reconstituted tobaccos tensile strength, it is characterized in that comprising the steps:
Step (1), the collection of sample: collect a collection of representative papermaking-method reconstituted tobaccos sheet products;
Step (2), gathers original spectrum: adopt the irreflexive mode of near infrared spectrum to carry out spectral scan one by one to the papermaking-method reconstituted tobaccos sheet products that step (1) is collected, obtain original spectrum;
Step (3), selects Calibration and verification sample collection: in step (2) gained original spectrum, adopt the method for standard GB/T 29858-2013 to select Calibration and verification sample collection;
Step (4), working sample reference value: at the standard conditions, utilizes standard method to carry out the mensuration of tensile strength one by one to the papermaking-method reconstituted tobaccos sheet products that step (1) is collected, obtains samples Reference value; Above-mentioned standard conditions are GB/T 16447 " atmospheric environment that tobacco and tobacco product regulate and test " defined terms; Standard method refers to be tested by standard Q/YNZY.J07.403-2014 " mensuration of papermaking-method reconstituted tobaccos tensile strength "; Standard method specifically measures the papermaking-method reconstituted tobaccos finished product of cutting, regulate rear cutting means, cut the rectangular rectangular sample getting 40 mm × 15 mm, 30 intact samples chosen by sample, rate of extension to 200 mm/min ± 0.5 mm/min of adjustment tensile strength test instrument, Adjustment Tests folder is apart from being 20 mm ± 0.1 mm, and the net result of a sample represents with the arithmetic mean of 30 Specimen Determination results, calculates according to the following formula:
S is sample tensile strength,
for sample mean tension stress, W is specimen width;
Step (5), pre-processed spectrum: pre-service is carried out, the impact of stress release treatment and baseline wander to the spectrum of the Calibration selected in step (3) and verification sample collection;
Step (6), set up PLS model: step (5) pretreated Calibration and step (4) gained samples Reference value are carried out one_to_one corresponding, application partial least square method carries out matching tensile strength determination data corresponding with it for spectroscopic data, set up quantitative model, carry out in modeling process detecting and rejecting abnormalities value, remaining spectra values is worth to rejecting abnormalities, again carry out one_to_one corresponding with step (4) gained samples Reference value, application partial least square method carries out matching tensile strength determination data corresponding with it for spectroscopic data, set up the quantitative model obtaining tensile strength index,
Step (7), modelling verification: the quantitative model of the tensile strength index that the verification sample set pair step (6) after utilizing step (5) to process is set up carries out external prediction;
Step (8), measures tensile strength: by the quantitative model of the tensile strength index that the original spectrum input step (6) of papermaking-method reconstituted tobaccos sample to be measured is set up, and namely measures and obtains tensile strength.
2. method according to claim 1, is characterized in that: the spectra collection condition of described step (2) is: sweep limit is 4000 ~ 10000cm
-1, resolution is 8cm
-1, scanning times is not less than 72 times.
3. method according to claim 1, it is characterized in that: the original spectrum of described step (2) is obtained by following method: papermaking-method reconstituted tobaccos sheet products step (1) collected, each product gets five Duplicate Samples, each Duplicate Samples 10 ~ 15 samples, make the sample mated with near infrared spectrum Special sample cup size, 10 ~ 15 samples are laid in sample cup successively, ensure the smooth placement of sample, thickness is 2 ~ 3cm, after gently flattening with sample-pressing device, be put on spectrometer universal stage, near infrared spectrum is utilized to adopt irreflexive mode to carry out scanning and gathering spectrum, each Duplicate Samples sweeps a spectrum, corresponding 5 the parallel spectrum of each product, again 5 parallel spectrum are carried out being averaging and obtain an original spectrum, identical method is adopted to scan and gather spectrum to each product successively, obtain the original spectrum that each product is corresponding.
4. method according to claim 1, is characterized in that: the pre-service of described step (5) refers to, centralization smoothing to original spectrum and first order derivative pre-service.
5. method according to claim 1, is characterized in that: in described step (6), detection and rejecting abnormalities value adopt the method detecting lever value, especially by the following step:
By following formulae discovery sample lever value:
Wherein,
h i for sample lever value,
t i for sample
ibecause of subvector,
t t tfor the factor score matrix of modeling collection,
t t i for
t i transposition;
When sample lever value is greater than 3k/n, wherein k is number of principal components, and n is sample number, and its spectrum has significant impact to recurrence, should reject.
6. method according to claim 1, it is characterized in that: the modelling verification of described step (7) adopts the predicted value of the quantitative model gained of t method of inspection determination verification sample collection input step (6) and corresponding step 4 gained samples Reference value whether to have deviation in statistical significance: namely, the predicted value of the quantitative model of the tensile strength index that step (6) is set up and the samples Reference value t value of step (4) and degree of freedom d
v-1critical value t
(a, dv-1)compare, get level of signifiance a=0.05, when | t| < t
(a, dv-1), during probability P >0.05, illustrate that the testing result of two kinds of methods does not exist significant difference, modelling verification success, this model can be used for the tensile strength measuring papermaking-method reconstituted tobaccos.
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| CN111537346A (en) * | 2020-05-12 | 2020-08-14 | 江苏中烟工业有限责任公司 | Tensile strength detection method for reconstituted tobacco finished product |
| CN111537346B (en) * | 2020-05-12 | 2023-08-29 | 江苏中烟工业有限责任公司 | Tensile strength detection method for reconstituted tobacco finished product |
| CN111811932A (en) * | 2020-07-16 | 2020-10-23 | 西安航天化学动力有限公司 | Near infrared spectrum analysis method for uniaxial tension mechanical property of composite solid propellant |
| CN111929155A (en) * | 2020-07-16 | 2020-11-13 | 西安航天化学动力有限公司 | Near infrared spectrum analysis method for uniaxial tension initial modulus of composite solid propellant |
| CN111811932B (en) * | 2020-07-16 | 2024-03-26 | 西安航天化学动力有限公司 | Near infrared spectrum analysis method for unidirectional stretching mechanical property of composite solid propellant |
| CN112304897A (en) * | 2020-09-14 | 2021-02-02 | 中国人民解放军战略支援部队航天工程大学 | Spectrum selection method and system for combustion field two-dimensional reconstruction |
| CN112304897B (en) * | 2020-09-14 | 2021-09-14 | 中国人民解放军战略支援部队航天工程大学 | Spectrum selection method and system for combustion field two-dimensional reconstruction |
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