YC/T 146-2010 English PDF (YCT146-2010)

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YC/T 146-2010: Leaf tobacco. Threshing and redrying. Technical specification
YC/T 146-2010
TOBACCO INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 65.160
X 87
Record No.: 30419-2011
Replacing YC/T 146-2001
Leaf tobacco - Threshing and redrying –
Technical specification
ISSUED ON: DECEMBER 01, 2010
IMPLEMENTED ON: JANUARY 01, 2011
Issued by: State Tobacco Monopoly Administration
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Technical requirements ... 7 
5 Packing ... 21 
6 Workshop environment ... 24 
7 Online quality testing ... 25 
Annex A (informative) Technical flow diagram ... 35 
Leaf tobacco - Threshing and redrying -
Technical specification
1 Scope
This Standard specifies technical requirements for each process of threshing
and redrying.
This Standard is applicable to flue-cured tobacco and burley tobacco.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB 2635, Flue-cured tobacco
GB 8966, Burley tobacco
GB/T 18771.2-2002, Tobacco vocabulary - Part 2: Tobacco processing and
tobacco products
GB/T 21136, Threshed tobacco - Determination of stem content
GB/T 21137, Leaf tobacco - Determination of strip particle size
YC/T 31, Tobacco and tobacco products - Preparation of test sample and
determination of water content - Oven method
YC/T 137.1, Package of redried strip - Corrugated carton
YC/T 147, Threshed tobacco - Quality inspection
YC/T 159, Tobacco and tobacco products - Determination of water soluble
sugars - Continuous flow method
YC/T 160, Tobacco and tobacco products - Determination of total alkaloids-
Continuous flow method
YC/T 161, Tobacco and tobacco products - Determination of total nitrogen-
Continuous flow method
A technical process that conducts high temperature treatment to the stem that
has been subjected to threshing and classifying, so that the moisture content of
the stem reaches the specified indicator, which is conducive to long-term
storage.
3.8 lamina packing
A process that conducts batch metering, pre-compression molding, packing-
bundling, marking to the redried lamina.
4 Technical requirements
See Annex A for the technical flow of threshing and redrying.
4.1 Preparing
4.1.1 Technical task
4.1.1.1 All raw materials of tobacco leaf that enter the production workshop
shall be metered and make detailed records.
4.1.1.2 The quality and quantity of raw materials of tobacco leaf that are put in
each batch shall meet the requirements of production regulations.
4.1.1.3 Prepare raw materials for threshing proportionately according to
proportion grade and quantity requirements strictly.
4.1.1.4 Stack raw materials of tobacco leaf in order according to batch number.
The interval between batches is not less than 1m. Do not stack wrong or stack
mixed or stack super-highly (the height limit is 2m).
4.1.1.5 Supply raw materials of tobacco leaf in balance according to batches,
sequence or ratio requirements.
4.1.2 Requirements for materials
4.1.2.1 The grade quality, moisture content and natural sand content of raw
materials of tobacco leaf shall meet technical requirements of GB 2635 and GB
8966.
4.1.2.2 The origin, type, variety and quantity of raw materials of tobacco leaf
shall meet requirements.
4.1.2.3 The bale has no serious damage. There shall be no mildew, odor,
pollution, water stains, sundries, and untreated maggot tobacco leaves in the
bale.
4.2.4 Equipment requirements
4.2.4.1 Cabinet doors, vacuum butterfly valves, blowout valves, safety valves,
cooling towers, condensate pumps, water tanks, meters shall meet the
equipment design requirements.
4.2.4.2 There shall be no damage or deformation of in-cabinet deflector and
side-wall deflector.
4.2.5 Process requirements
4.2.5.1 When the ambient temperature is lower than 25°C, the moisture content
of the tobacco leaf is lower than 16%, or when the tobacco leaf is compacted,
it shall use vacuum conditioning.
4.2.5.2 Steam pressure, water pressure, compressed air pressure shall meet
the requirements of technical conditions.
4.2.5.3 Determine the vacuum conditioning cycle according to tobacco leaf’s
origin, type, grade, variety, moisture content, and degree of tobacco sticking.
4.2.5.4 There shall be a gap between the bale and its carrier, between the inner
wall and the door of the vacuum cabinet. They shall not be in touch. Stack the
bales neatly.
4.2.5.5 Tobacco leaves after vacuum conditioning shall not be sealed in a
vacuum cabinet. The bale storage time after leaving the cabinet shall not
exceed 30min. In case of equipment failure, measures shall be taken to unpack
the bale.
4.2.5.6 Tobacco leaves shall be loose and soft after conditioning. Maintain the
original color and luster, no flushing or water staining on the lamina.
4.3 Leaf spreading, tipping and loosening
4.3.1 Technical task
4.3.1.1 Spreading the materials continuously, uniformly and neatly on swing bar
conveyor according to production requirements.
4.3.1.2 When tipping and threshing, cut the tip of the tobacco stem less than
1.5mm in diameter.
4.3.1.3 Exclude non-tobacco leaf material, green, mildew, oily, worm-eaten
tobacco leaves and tobacco leaves that do not meet the requirements.
Separate shredded cigarettes in tobacco hand.
4.3.2 Requirements for materials
4.4.4.3 Tobacco leaves should be loose after conditioning, without sticking,
water stains, flushing leaves, steamed slices. Ensure the original color of
tobacco leaf.
4.4.4.4 After single ordering, tobacco leaf is characterized by soft lamina.
Tobacco tendons do not break easily when held by hand. Lamina can be torn
off from the tobacco tendon. The tear is not smooth.
4.4.4.5 After double ordering, tobacco leaf is characterized by soft tobacco
lamina and tendon when held by hand. Lamina can be torn off from the tobacco
tendon easily. The tear is smooth.
4.4.4.6 In case of failure, shut down the soda valve in time. when the downtime
is more than 15min, the tobacco leaves in the cylinder shall be transferred out
to dry.
4.5 Sand sieving selection
4.5.1 Technical task
Remove debris such as sand, tobacco bugs and eggs mixed in tobacco leaves.
Separate shredded tobacco.
4.5.2 Requirements for materials
Meet the requirements for single-ordering technical indicators in 4.4.2.
4.5.3 Process requirements
4.5.3.1 Tobacco leaf flow is uniform, in line with equipment process capacity.
4.5.3.2 Sieving holes are not blocked. The output is smooth after sieving.
4.6 Leaf base, tip selection
4.6.1 Technical task
4.6.1.1 Manually pick out green tobacco, moldy tobacco, sundries, and other
tobacco leaves that do not meet technical requirements.
4.6.1.2 Manually open bundle of bundled tobacco hands.
4.6.2 Requirements for materials
4.6.2.1 Meet the requirements for single-ordering technical indicators in 4.4.2.
4.6.2.2 Tobacco leaves are loose. The flow distribution is uniform.
4.6.3 Process requirements
NOTE 3: For burley tobacco, the lamina rate for the lamina of which the size is greater than
12.7mm×12.7mm is respectively reduced by 2%, 3% and 5% according to first-class
tobacco, medium-class tobacco and low-class tobacco based on flue-cured to...