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GB 2635-1992: Flue-cured tobacco
GB 2635-1992
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC 663.973.051.7
B 35
Flue-Cured Tobacco
烤烟
[Including Amendments No.1 and No.2]
ISSUED ON: AUGUST 15, 1992
IMPLEMENTED ON: SEPTEMBER 01, 1992
Issued by: State Bureau of Technical Supervision
Table of Contents
1 Subject Contents and Applicable Scope ... 3
2 Normative References ... 3
3 Terms and Codes ... 3
4 Groups, Grading ... 7
5 Technical Requirements ... 7
6 Acceptance Rules ... 10
7 Inspection Methods ... 13
8 Inspection Rules ... 16
9 Physical Standard Sample ... 17
10 Packaging, Marking, Transportation, Storage ... 17
Additional Information: ... 19
QB/T 2635-1992 "Flue-Cured Tobacco" Amendment No.1 ... 20
QB/T 2635-1992 "Flue-Cured Tobacco" Amendment No.2 ... 21
Flue-Cured Tobacco
1 Subject Contents and Applicable Scope
This Standard specifies the technical requirements, inspection methods and
acceptance rules for flue-cured tobacco.
This Standard applies to bundled flue-cured tobacco that has not been fermented after
initial or re-baking. The written standards, supplemented by physical samples, are the
basis for grading, acquisition, and handover. Export supply is based on physical
samples.
2 Normative References
GB 8170 Rules for Rounding off of Numerical Values
3 Terms and Codes
3.1 Terms
3.1.1 Groups
It is formed by the classification of the closely related grades, on the basis of certain
features related to the location, color and overall quality of the tobacco leaf.
3.1.2 Grading
The grade of the tobacco leaves in the same group, which is classified according to
the quality.
3.1.3 maturity
The degree of maturity of tobacco leaves after modulation (including field and
modulation maturity), the maturity is divided into the following levels:
3.1.3.1 Mellow
The upper tobacco leaves that are reached a high degree of maturity in the field, and
they are fully ripe after modulation.
3.1.3.2 Ripe
color, which is divided into the following levels:
3.1.7.1 Deep
The leaf surface is uniform in color and saturated in color and luster.
3.1.7.2 Strong
The color is uniform, and the saturation is slightly worse.
3.1.7.3 Moderate
The color is uniform yet and the saturation is general.
3.1.7.4 Weak
The color is not uniform, and the saturation is poor.
3.1.7.5 Pale
The color is not uniform, and the luster is light.
3.1.8 Length
The distance from the end of the main veins of the leaf to the tip, which is expressed
in cm.
3.1.9 Waste
Tobacco leaf tissue is damaged, losing the strength and firmness of the strips, and
basically has no use value (including disease spots, scorched tips and scorched edges
due to the maturity increase of tobacco leaf), expressed by a percentage (%).
3.1.10 Injury
The leaf loses its original integrity due to mechanical damage, and the damaged area
of each leaf does not exceed 50%, expressed by a percentage.
3.1.11 Color
The state of the related color, luster saturation and color value of the same type of
tobacco leaves after modulation.
3.1.11.1 Lemon
Tobacco leaves are all yellow in appearance, within the color gamut used to be called
pale yellow and positive yellow.
3.1.11.2 Orange
5.5 The bundled requirements of tobacco leaves shall be natural bundle with 25~30
leaves per bundle; the bundle head circumference is 100~120mm and the winding
width is 50mm.
6 Acceptance Rules
6.1 Grading principles
When the maturity, leaf structure, body, oil, color intensity, and length of flue-cured
tobacco reach a certain grade, and the waste does not exceed the allowable degree
of a certain grade, it is determined as a certain grade.
6.2 Determination of the final grade
When the re-inspection does not match the determined grade, then the original grade
is invalid.
6.3 If a batch of tobacco leaves is on the boundary of the two colors, then the color will
be determined first and then determine the grade according to other qualities.
6.4 If a batch of tobacco leaves is at the boundary of two grades, then it shall be
determined at lower grade.
6.5 If the grade element of a batch of tobacco leaves is grade B, when one of which is
lower than grade B, then it shall be determined at grade C; when one or more elements
are higher than grade B; then it shall still be determined at grade B.
6.6 All the following phenomena shall not be graded, such as green tablets, frozen
tobacco leaves, fire damage, fire smoke, odor, mildew, doping, moisture overrun, etc.;
and shall not be acquired.
6.7 The cutters of lugs variegated grade 1 (CX1K) is limited to the waist leaf and the
lower second shed position.
6.8 Slick grade 1 (S1) is limited to the waist leaf, the upper and lower second shed
positions.
6.9 Green-yellow grade 1 is limited to tobacco leaves containing 20% or less of the
green.
6.10 Green-yellow grade 2 is limited to tobacco leaves containing 30% or less of the
green.
6.11 In Group H, H1F is orange; and H2F includes orange and red.
6.12 Tobacco leaves of which the cutters’ greenish quality is lower than C3V shall be
listed in the grade X2V.
6.13 If the cutters leaf is shorter than 35 cm, it shall be determined at the grade of lugs
leaf.
6.14 Tobacco leaves with a variegated area over 20% are graded in variegated group.
6.15 Tobacco leaves with a variegated area of less than 20% are allowed to be graded
in the positive group; but the sum of variegated and waste must not exceed the
percentage of waste at the corresponding grade. If the above sum exceeds the
percentage, it shall be determined at the next grade. If the sum of the variegated and
waste exceeds the minimum level of waste tolerance in this group, it may be
appropriately graded in the variegated group.
6.16 The CX1K variegated area does not exceed 30%; if exceeding, it shall be
determined at the next grade.
6.17 B1K variegated area does not exceed 30%.
6.18 B2K variegated area does not exceed 40%; if exceeded 40%, it shall be
determined at the next grade.
6.19 The faded tobacco is graded in the slick group.
6.20 Slightly flue-cured red tobacco with no obvious influence on the basic color shall
be graded in the corresponding position and color group at grade 2 below.
6.21 If there are both slick and variegated tobacco leaves on the leaf, it shall be graded
in the variegated group.
6.22 When there is variegation on the green-yellow tobacco leaf, it shall still be graded
according to quality in the green-yellow tobacco group.
6.23 The calculation of damage is based on the percentage of the total area of damage
in a bundle of tobacco to the total area of the of tobacco leaves in that bundle; the
integrity of each leaf must be more than 50%; and less than 50% is listed as an out-of-
grade tobacco. See Table 4 for the provisions of the damage rate.
6.24 The requirements for purity tolerance are shown in Table 4.
7.2.1 Sampling for moisture inspection
The sampling quantity is no less than 0.5kg; it is taken on average from all samples
opened on site. If there are more than 10 samples opened during the on-site inspection,
select any one piece among every 2~3 pieces in the excessive part. Sampling
positions of each sample are drawn at an equal distance from 2 ~ 5 positions on a
diagonal line on the side of the opening; one bundle for each position; arbitrarily take
half bundle from each, and place in an airtight container. When testing, select 2...