CN111537346B - Tensile strength detection method for reconstituted tobacco finished product - Google Patents
Tensile strength detection method for reconstituted tobacco finished product Download PDFInfo
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- CN111537346B CN111537346B CN202010397331.9A CN202010397331A CN111537346B CN 111537346 B CN111537346 B CN 111537346B CN 202010397331 A CN202010397331 A CN 202010397331A CN 111537346 B CN111537346 B CN 111537346B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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Abstract
The invention discloses a method for detecting tensile strength of reconstituted tobacco finished products, which comprises the following steps: K1. cutting a strip-shaped sample with 15mm reconstituted tobacco, fixing two end parts of the strip-shaped sample into clamping heads of a tensile strength detector, setting the positions of the clamping heads to enable the test distance of the strip-shaped sample to be W1, stretching the strip-shaped sample by using the tensile strength detector, and measuring a tensile strength detection value to be S1; K2. adjusting the position of the clamping head in the step K1 to enable the test distance of the strip-shaped sample to be W2, stretching the strip-shaped sample by using a tensile strength detector, and measuring a tensile strength detection value to be S2; K3. the tensile strength actual detection value S of the reconstituted tobacco is obtained by calculation according to a formula, and the method is suitable for directly detecting the finished reconstituted tobacco, accurate and quick, and is beneficial to reconstituted tobacco technology and product quality control.
Description
Technical Field
The invention relates to the field of reconstituted tobacco production, in particular to a method for detecting tensile strength of a reconstituted tobacco finished product.
Background
The reconstituted tobacco technology is to process tobacco stems, tobacco fragments, tobacco dust and the like serving as raw materials by using a papermaking technology to prepare a product with tobacco taste, and the reconstituted tobacco product has the characteristics of good processing resistance, remarkable tar reduction effect, strong product quality plasticity and the like, so that the reconstituted tobacco technology is widely applied in the tobacco industry.
The tensile strength is an important physical index of the reconstituted tobacco product, and can influence the process control in the paper making section of a paper machine, and also influence the procedures of shredding, blending and the like when the reconstituted tobacco product is applied. In general, the tensile strength of reconstituted tobacco products is measured by a tensile strength meter by taking an uncut reconstituted tobacco paper web from a production enterprise in the production process, and then sending the paper web to a laboratory to cut paper strips with a certain length and width. According to the standard method of GBT22898 (constant-speed tensile method for measuring tensile strength of paper and paper board) (100 mm/min), in order to unify the judgment standard, the test distance is 100mm when the tensile strength is detected, namely the length of a detection sample is more than 100mm, the detection can be carried out, the cut reconstituted tobacco finished product is a diamond-shaped small piece with uneven size, which is formed after cutting, the size is about 5-30mm, the cut paper strip cannot reach the length required by the detection of a tensile strength instrument, the detection cannot be directly carried out according to national standard, the difference of the tensile strength detection values of the reconstituted tobacco finished products with different sizes after cutting is large, and the actual tensile strength of reconstituted tobacco cannot be simply calculated under the condition that the standard specification is 100 mm. Therefore, developing a tensile strength detection method of reconstituted tobacco finished products has important significance for optimizing reconstituted tobacco process technology and controlling product quality.
Disclosure of Invention
In order to solve the problems, the invention provides a method for detecting the tensile strength of reconstituted tobacco finished products, which is suitable for directly detecting the reconstituted tobacco finished products, accurate and quick and is beneficial to reconstituted tobacco process and product quality control.
The invention provides a method for detecting tensile strength of reconstituted tobacco finished products, which comprises the following steps:
K1. cutting a strip-shaped sample with 15mm reconstituted tobacco, fixing two end parts of the strip-shaped sample into clamping heads of a tensile strength detector, setting the positions of the clamping heads to enable the test distance of the strip-shaped sample to be W1, stretching the strip-shaped sample by using the tensile strength detector, and measuring a tensile strength detection value to be S1;
K2. adjusting the position of the clamping head in the step K1 to enable the test distance of the strip-shaped sample to be W2, stretching the strip-shaped sample by using a tensile strength detector, and measuring a tensile strength detection value to be S2;
K3. and calculating according to a formula to obtain an actual detection value S of the tensile strength of the reconstituted tobacco.
Preferably, the 0mm < W1.ltoreq.100 mm, 0mm < W2.ltoreq.100 mm, and W1.noteq.W2.
Preferably, in the step K1, before fixing the two ends of the strip-shaped sample to the collet of the tensile strength tester, the method further includes the steps of: the strip was equilibrated.
Preferably, the shearing mode of the reconstituted tobacco is transverse shearing or longitudinal shearing.
Preferably, in the steps K1 and K2, when the strip-shaped sample is stretched by using a tensile strength tester, the obtained tensile strength test value data is discarded if the strip-shaped sample is displaced in the collet, and the obtained tensile strength test value data is discarded if the strip-shaped sample is broken within 1mm of the end of the collet.
Preferably, in the steps K1 and K2, S1 and S2 are average values obtained after n times of detection, where n is greater than or equal to 3.
Preferably, the equilibrium temperature is 22 ℃ ± 1 ℃, the equilibrium relative humidity is 60% ± 3%, and the equilibrium time is 48 hours.
Preferably, in the step K1, after cutting the strip-shaped sample of reconstituted tobacco with 15mm, the method further includes the steps of: and selecting a flat and unbroken strip sample.
The specific implementation steps of the scheme are as follows:
cutting reconstituted tobacco into 15mm wide strip sample, selecting flat and unbroken strip sample, balancing at 22+ -1deg.C and 60% + -3% relative humidity for 48 hr, fixing two ends of the strip sample in the clamp of tensile strength detector, setting clamp position, and leaving W in the middle 1 The length of the sample is mm, the sample is kept flat and parallel to the detection direction of the instrument, and the detection value S is obtained by stretching the instrument 1 (units N/m);
changing the length of the sample between the chucks to W 2 mm, repeating the detection process, and stretching the strip-shaped sample by using a tensile strength detector to obtain a tensile strength detection value S 2 (units N/m);
according to the formulaCalculating to obtain the actual detection value S (unit N/m) of the tensile strength of the reconstituted tobacco under the length of 100mm of national standard; wherein S is the actual detection result of the tensile strength; units N/m, W 1 And W is 2 The length of the sample left in the middle of the clamp during the two detection is respectively in mm; s is S 1 And S is 2 Respectively the sample length is W 1 And W is 2 Detecting a value in N/m;
to verify the resistance of the formula in this schemeThe accuracy of the actual detection value of the tensile strength is set to be compared in two ways, one is to use the raw materials of the same reconstituted tobacco to prepare a sample which meets the detection requirement of more than 100mm in the national standard detection method GBT22898 (100 mm/min) for measuring the tensile strength of paper and paper boards), and the measured result is named as an undivided sample detection value; and the other is to find the numerical relation between the actual detection value of the tensile strength and the length of the sample, and to carry out regression analysis by taking the independent variable of the length W of the sample and the actual detection value S of the tensile strength detected under different sample lengths as the dependent variable, so as to obtain a logarithmic relation formula: s=a lnW +b, w=w 1 、W 2 、W 3 、W 4 …W n Obtaining the corresponding actual detection value S=S of the tensile strength 1 、S 2 、S 3 、S 4 …S n Will W 1 、W 2 、S 1 、S 2 Substituting s=a lnW +b, yields:
S 1 =a*lnW 1 +b
S 2 =a*lnW 2 +b
from the above two formulas, the form of the logarithmic relation where the constant a, b is represented by the two detected S and W values, respectively, can be derived:
，/>
therefore, the actual test result of the tensile strength, that is, the test value at the test distance of 100mm, is obtained by substituting a, b in the form of two-time tested S and W values and w=100 into the relation s=a× lnW +b, and the accuracy and correlation of s=a× lnW +b can be changed by changing w=w 1 、W 2 、W 3 、W 4 …W n To verify.
The invention has the beneficial effects that:
1. the scheme enables the reconstituted tobacco finished product which does not meet the national standard detection length to be capable of rapidly and accurately obtaining the actual detection value of the tensile strength of the reconstituted tobacco finished product under the national standard specification of 100mm length;
2. the scheme overcomes the deviation of tensile strength measured by instruments for reconstituted tobacco finished products with different sizes;
3. the method is suitable for detecting the tensile strength of reconstituted tobacco of different types, and is beneficial to the control of reconstituted tobacco technology and product quality.
Drawings
FIG. 1 is a logarithmic regression equation and curve of the test distance W and the detection value S;
FIG. 2 is a comparative analysis of the actual tensile strength of reconstituted tobacco in example 4 with the measured value of the non-cut sample;
fig. 3 is a comparative analysis of the actual tensile strength value and the actual test verification value of the tensile strength of reconstituted tobacco at a standard test length of 100 mm.
Detailed Description
In order to make the contents of the present invention more easily understood, the technical scheme of the present invention will be further described with reference to the specific embodiments, but the present invention is not limited thereto.
Example 1
Cutting reconstituted tobacco into 15mm wide strip sample, selecting flat and unbroken strip sample, balancing at 22+ -1deg.C and 60% + -3% relative humidity for 48 hr, fixing two ends of the strip sample in the clamp of tensile strength detector, setting clamp position, and leaving W in the middle 1 The length of the sample is mm, the sample is kept flat and parallel to the detection direction of the instrument, and the detection value S is obtained by stretching the instrument 1 (units N/m);
changing the length of the sample between the chucks to W 2 mm, repeating the detection process, and stretching the strip-shaped sample by using a tensile strength detector to obtain a tensile strength detection value S 2 (units N/m);
according to the formulaCalculating to obtain the real tensile strength of the reconstituted tobacco under the national standard length of 100mmAn inter-detection value S (unit N/m); wherein S is the actual detection result of the tensile strength; units N/m, W 1 And W is 2 The length of the sample left in the middle of the clamp during the two detection is respectively in mm; s is S 1 And S is 2 Respectively the sample length is W 1 And W is 2 Detecting a value in N/m, wherein in the steps K1 and K2, S1 and S2 are average values obtained after N times of detection, and N is more than or equal to 3;
in order to ensure the validity of the S value of the obtained actual detection result of the tensile strength, the thickness of the steel sheet is 0mm<W 1 ≤100mm、0mm<W 2 Less than or equal to 100mm and W 1 ≠W 2 ；
The shearing mode of the reconstituted tobacco is transverse shearing or longitudinal shearing, so that deviation of tensile strength measured by the reconstituted tobacco with the same detection length due to oblique shearing of the reconstituted tobacco is reduced;
in the steps K1 and K2, when the strip-shaped sample is stretched by using the tensile strength detector, the obtained tensile strength detection value data is removed if the strip-shaped sample is displaced in the chuck, and the obtained tensile strength detection value data is removed if the strip-shaped sample is broken within 2mm of the end of the chuck, so that the validity and the authenticity of the detection data are ensured.
Example 2
Cutting a small finished product of the No. 1 reconstituted tobacco product into a strip-shaped sample with the width of 15mm along the longitudinal direction, fixing two end parts of the strip-shaped sample into chucks of a tensile strength detector, setting the positions of the chucks, keeping the experimental distance of 5mm, keeping the sample flat and parallel to the detection direction of the instrument, and stretching the sample by the instrument to obtain a detection value 1097N/m (average value obtained by multiple detection, the same applies below); changing the length of the sample between the clamps to 20mm, repeating the detection process to obtain a detection value 965.3N/m, and obtaining W 1 =5mm，W 2 =20mm，S 1 =1097N/m，S 2 = 965.3N/m substituted into the following formula:the actual detection value (100 mm test length) of the tensile strength of the reconstituted tobacco is calculated to be S= 812.4N/m.
Example 3
Cutting a small finished product of the No. 2 reconstituted tobacco product into a strip-shaped sample with the width of 15mm along the transverse direction, fixing two end parts of the strip-shaped sample into chucks of a tensile strength detector, setting the positions of the chucks, keeping the experimental distance of 5mm, keeping the sample flat and parallel to the detection direction of the instrument, and stretching the instrument to obtain a detection value S 1 The method comprises the steps of carrying out a first treatment on the surface of the Changing the length of the sample between the clamps to 20mm, repeating the detection process to obtain a detection value S 2 N/m, W 1 =5mm，W 2 =20mm, substituting the following formula:the actual detection value (100 mm test length) of the tensile strength of the reconstituted tobacco is calculated to be S=541.4N/m.
Example 4
Cutting a small piece of finished product of the No. 1 reconstituted tobacco product into a strip-shaped sample with the width of 15mm along the longitudinal direction, selecting a flat and unbroken strip-shaped sample, balancing for 48 hours at the temperature of 22+/-1 ℃ and the relative humidity of 60+/-3%, fixing two end parts of the strip-shaped sample in a chuck of a tensile strength detector, setting the chuck position, keeping the experimental distance of 5mm, keeping the sample flat and parallel to the detection direction of an instrument, and stretching the sample by the instrument to obtain a detection value 1097N/m (average value obtained by multiple detection, the same applies below); changing the length of the sample between the clamps to 20mm, repeating the detection process to obtain a detection value 965.3N/m, and obtaining W 1 =5mm，W 2 =20mm，S 1 =1097N/m，S 2 = 965.3N/m substituted into the following formula:the actual detection value (100 mm test length) of the tensile strength of the reconstituted tobacco is calculated to be S= 812.4N/m.
The longitudinal and transverse tensile strength values of the No. 1, no. 2 and No. 3 reconstituted tobacco products are respectively detected and calculated by the same method, and meanwhile, the tensile strength detection values detected by the national standard GBT22898 (measuring constant-speed tensile strength method for paper and cardboard) (100 mm/min) are compared with the tensile strength detection values detected by the on-site non-cut same-brand same-batch reconstituted tobacco samples, and the result is shown in figure 2.
The difference calculation mode of the actual detection value and the detection value of the non-split sample is as follows: the actual detection value obtained by the scheme has smaller difference than the tensile strength detection value of the non-cut sample, and the difference is within 5%, so that the actual detection value (100 mm test length) of the tensile strength of the reconstituted tobacco product can be accurately reflected.
Example 5
Cutting the small sheet product of the No. 1 reconstituted tobacco product into strip-shaped samples with the width of 15mm along the longitudinal direction, selecting the flat and unbroken strip-shaped samples, balancing for 48 hours at the temperature of 22+/-1 ℃ and the relative humidity of 60+/-3%, fixing the two end parts of the strip-shaped samples in chucks of a tensile strength detector, setting the positions of the chucks, and leaving W 1 Test distance of length=5 mm, keeping the sample flat and parallel to the instrument detection direction, and obtaining a detection value S by instrument stretching 1 =1097 mm；
Cutting the small sheet product of the No. 1 reconstituted tobacco product into strip-shaped samples with the width of 15mm along the longitudinal direction, selecting the flat and unbroken strip-shaped samples, balancing for 48 hours at the temperature of 22+/-1 ℃ and the relative humidity of 60+/-3%, fixing the two end parts of the strip-shaped samples in chucks of a tensile strength detector, setting the positions of the chucks, and leaving W 2 Test distance of length= mm, keeping the sample flat and parallel to the instrument detection direction, and obtaining a detection value S by instrument stretching 2 =1042 mm；
Cutting the small sheet product of the No. 1 reconstituted tobacco product into strip-shaped samples with the width of 15mm along the longitudinal direction, selecting the flat and unbroken strip-shaped samples, balancing for 48 hours at the temperature of 22+/-1 ℃ and the relative humidity of 60+/-3%, fixing the two end parts of the strip-shaped samples in chucks of a tensile strength detector, setting the positions of the chucks, and leaving W 3 Test distance of length=15 mm, keeping the sample flat and parallel to the instrument detection direction, and obtaining a detection value S by instrument stretching 3 =1002mm；
Cutting the small finished product of the No. 1 reconstituted tobacco product into strip-shaped samples with the width of 15mm along the longitudinal direction, and selecting and flatteningThe unbroken strip sample is balanced for 48 hours at the temperature of 22+/-1 ℃ and the relative humidity of 60+/-3%, the two ends of the strip sample are fixed in the clamping heads of the tensile strength detector, the positions of the clamping heads are set, and W is reserved 4 Test distance of length= mm, keeping the sample flat and parallel to the instrument detection direction, and obtaining a detection value S by instrument stretching 4 = 965.3mm, the result is shown in fig. 3;
regression analysis was performed with the independent variable of the sample length W and the detection value S at different sample lengths as the dependent variable, and the results are shown in fig. 1.
As shown in FIG. 1, the independent variable of the sample length W is measured, the data of the detection value S when the sample length is 0-20mm is measured, regression analysis is carried out, and the logarithmic relation formula of the detection value S conforming to the form of S= -93.55 XlnW+1251.4 under different sample lengths is obtained, and the correlation R is obtained 2 0.9891, the fitting effect of the relation is better.
The actual detection verification value of the tensile strength of the sample (100 mm long sample) can be calculated by substituting W=100 into the formula, and is 820.6N/m, which is close to the non-cut sample detection value 852.7N/m and the actual detection value of the tensile strength (100 mm test length) 812.4N/m, so that the method can accurately reflect the actual detection value S of the tensile strength of the reconstituted tobacco (100 mm test length).
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. The tensile strength detection method of the reconstituted tobacco finished product is characterized by comprising the following steps of:
K1. cutting a strip-shaped sample with 15mm width of reconstituted tobacco, fixing two end parts of the strip-shaped sample into chucks of a tensile strength detector, and setting the positions of the chucks to ensure that the test distance of the strip-shaped sample is W 1 The strip-shaped sample is stretched by using a tensile strength detector, and the tensile strength detection value is S 1 ；
K2. Adjusting the position of the chuck in the step K1 to enable the test distance of the strip-shaped sample to be W 2 Make the followingThe strip-shaped sample is stretched by a tensile strength detector, and the measured tensile strength is S 2 ；
0mm<W 1 ≤100mm、0mm<W 2 Less than or equal to 100mm and W 1 ≠W 2 ；
K3. According to the formulaCalculating to obtain a tensile strength calculated value S of the reconstituted tobacco at a test distance of 100 mm;
the difference between the calculated tensile strength value S and the tensile strength detection value of the non-cut reconstituted tobacco samples with the same brand and the same batch is within 5 percent according to the national standard GBT22898 method for measuring the tensile strength of paper and paper boards (100 mm/min).
2. The method for detecting the tensile strength of a reconstituted tobacco finished product according to claim 1, wherein in the step K1, before fixing both end portions of the strip-shaped test piece to the grippers of the tensile strength detector, the method further comprises the steps of: the strip was equilibrated.
3. The method for detecting the tensile strength of a reconstituted tobacco finished product according to claim 1, wherein the shearing mode of the reconstituted tobacco is transverse shearing or longitudinal shearing.
4. The method for detecting the tensile strength of a reconstituted tobacco finished product according to claim 1, wherein in the steps K1 and K2, when the strip-shaped sample is stretched by using a tensile strength detector, the obtained tensile strength detection value data is discarded if the strip-shaped sample is displaced in the chuck, and the obtained tensile strength detection value data is discarded if the strip-shaped sample is broken within 1mm of the end of the chuck.
5. The method for detecting the tensile strength of a reconstituted tobacco finished product according to claim 1, wherein in the steps K1 and K2, the S is 1 、S 2 For n times examineThe average value obtained after measurement, wherein n is more than or equal to 3.
6. The method for detecting the tensile strength of a reconstituted tobacco finished product according to claim 2, wherein the equilibrium temperature is 22 ℃ ± 1 ℃, the equilibrium relative humidity is 60% ± 3%, and the equilibrium time is 48 hours.
7. The method for detecting the tensile strength of a reconstituted tobacco finished product according to claim 1, wherein in the step K1, after shearing the reconstituted tobacco into a 15mm strip-shaped sample, the method further comprises the steps of: and selecting a flat and unbroken strip sample.
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