Some standard content:
Appendix A of this standard is a normative appendix. Appendix B is a data appendix. This standard is proposed by the State Tobacco Monopoly Administration. This standard is under the jurisdiction of the National Tobacco Standardization Technical Committee (TC144). The drafting unit of this standard is Shanghai Tobacco Group (Company). The main drafters of this standard are Liu Xuemin, Zhang Min and Xiao Ju. YC/T 167--2003. 1 Scope. Test method for tobacco expansion rate. This standard specifies the test method for tobacco expansion rate. This standard is applicable to the test of tobacco expansion rate of leaf, expanded tobacco and thin slices. 2 Normative references
YC/T167--2003
The clauses in the following documents become the clauses of this standard through reference in this standard. For all references with a date, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all references without a date, the latest versions are applicable to this standard. GB/T16447 Atmospheric environment for conditioning and testing of tobacco and tobacco products (GB/I16447-1996, idt1S(3402:1991)
GB/T18771.4—2002 Tobacco terminology
Part 4: Quality evaluation and testing (1S010185:1993.Tobaccoandtobaeco products—Vorabulary, NFQ) 3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
Ifilling value of cut tobaccoFilling value of cut tobacco
The volume occupied by cut tobacco per unit mass under the conditions of specified compression time and certain pressure after the cut tobacco has been balanced to the specified value of moisture content, expressed in cubic cubic meters/gram,
[GB/T 18771. 4—2002. Definition 2.113]3.2
Expansion rate
The ratio of the difference between the filling value after expansion and the filling value before expansion to the filling value before expansion, expressed as a fraction. 4 Test principle
Take 10.0g±0.5g of the cut tobacco before and after expansion of a system, under the condition of moisture content of 11.5% to 13.5%, apply a force of 129.4N to 305. The obtained volume is divided by the sample mass to obtain the filling value, and the expansion rate is obtained by calculating the increase of the filling value after expansion and the filling value before expansion.
5 Collection equipmentbZxz.net
a) Electronic, sensitivity (.001;
b) Density weight, sensitivity 0.01ml./g;
) Balance box, with adjustment device, and can automatically control the temperature at ±1℃, relative humidity at 2%. 6 Sample extraction and preparation
6,1 Take samples at the determined positions and time periods before and after the expansion of tobacco, the sample weight is about 500B, the sampling should make the tobacco fall into the container by itself, and ensure that the tobacco in all parts of the cross section of the tobacco flow is obtained, remove the seal of the device and mark it. 6.2 Divide the sample before and after expansion into five portions, with a mass of about 10%g, and place them in a shallow dish with a wire mesh bottom, mark them, and then adjust the moisture content according to YC/T167-2003 (GB/T16447 (or the moisture content reaches 11.5%-13.5%)). 6.3 After the equilibrium time or moisture content reaches the requirements, place the sample and the mark in the shallow dish with a wire mesh bottom from the equilibrium box into a sealed container. 7 Test steps 7.1 Open the container, pour the sample into the shallow dish, turn it slightly by hand to make it uniform, and then take out the sample for about 30 minutes. Place in a sealed container to detect moisture content.
7.2 Weigh 0.5g of sample with a mass of 10.0, pour into the measuring tube with a funnel and evenly scoop the surface of the tobacco, then put the measuring tube into the base and press the button. When the automatic detection stops, record the value on the display, which is the height of the sample after compression. 7.3 Repeat steps 7.1 to 7.2 to complete the test of five samples before and after expansion respectively. 8 Result calculation
Calculate the moisture content and height average of the five test samples before and after expansion respectively. Filling is calculated according to formula (1):
d - arn/g
d——filling value, in cubic centimeters per gram (rm\ /g); - radius of the measuring tube, in centimeters (cm); - height after compression, in centimeters (cm); g
sample mass, in grams (g).
Corrected filling value is calculated according to formula (2):
d=K×(u-12.5%)+
In the formula:
d——corrected filling value, in cubic centimeters per gram (cm\/g); 2
actual moisture content (%):
K—-filling value correction coefficient
filling value, in cubic centimeters per gram (cm2/g). Note: The determination of the filling value correction coefficient shall be carried out in accordance with the provisions of Appendix A. The expansion rate is calculated according to formula (3):
E = d=dt × 100%
Where:
EExpansion rate:
d,——Filling value after expansion, in cubic pressure meter per gram (crn/g);d.——Filling value before expansion, in cubic ku meter per gram (n/g). 2
++( 3)
A,1 Sample extraction and preparation
Appendix A
(Normative Appendix)
Determination of block recharge correction coefficient
YC/T:167--2003
A,1.1 Samples are taken at the determined positions and time periods before and after tobacco expansion. The sample mass is about 2000g. When sampling, the tobacco should fall into the container and all parts of the tobacco flow should be obtained. The container should be sealed and marked. A.1.2 The extracted samples before and after expansion are placed in the tobacco storage environment for about 24 hours. A,1.3 After the equilibrium time reaches the requirement, the samples before and after expansion are divided into four equal parts, each with a mass of about 5008, and placed in a dry and sealed container. Mark them for equilibrium in the equilibrium box under four sets of temperature and humidity environmental conditions. A.1.4: Open the sample before and after expansion, divide each into five parts, each with a mass of about 100B, place them in a wire mesh bottom shallow dish, mark them, and then adjust the moisture content according to GB/T16447. A.1.5 After the equilibrium time reaches the requirement, place the sample and the mark in the wire mesh bottom shallow dish from the equilibrium box into a sealed container for the content and filling value test.
A1.6 Repeat steps A.1.4 to A.1.5 three times. The environmental conditions of the equilibrium box are: temperature 22℃±1℃, relative humidity 50%±2%, temperature 22℃±1℃, relative humidity 60%±2%, temperature 22℃±1℃, relative humidity 70%±2%, A.2 Test steps
Measure the moisture content of the four samples prepared above by the 2h oven method, and determine the filling value according to this standard. A,3 Result calculation
Calculate the average moisture content and filling value of the samples before and after expansion under the four sets of temperature and humidity environmental conditions. Calculate the slope of the filling value to the moisture content by regression method. When the filling value correction coefficient is verified to be effective, the absolute value of the slope is the filling value correction coefficient.
A.4 Validity Verification
After expansion, when the correlation coefficient is greater than or equal to 0.95, the value obtained by substituting the monthly static positive coefficient and the moisture content of 12.5% into the regression equation, that is, the positive filling value is close to the moisture content of 12.5, then the filling value positive coefficient is effective, otherwise the test should be repeated.
Before expansion. When the correlation coefficient is greater than or equal to 0.95, and the correction coefficient and the moisture content of 12.5% are substituted into the regression equation, that is, the correction filling value and the expansion rate calculated by the correction filling value after expansion, if it is close to the investment design index, then the filling value correction coefficient is effective, otherwise the test should be repeated.
When the material or processing technology and testing instruments change, the filling value correction coefficient should be re-determined. YC/T 167—2003
-1 kg magnetic code
2--- 2 kg pressure head;
Digital display and zero button;
4-----Measurement unit,
Water half finger:
Timer +
-Up/down switch:
Internal printer:
9—…Automatic/manual switch.
(Informative Appendix
Typical filling instrument country
Heinr Bnsgwaldl Cu. DD-60A type device 000
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