YC/T 147-2010 English PDF (YCT147-2010)

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YC/T 147-2010: Threshed tobacco. Quality inspection
YC/T 147-2010
TOBACCO INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 65.160
X 87
Record No.: 30420-2011
Replacing YC/T 147-2001
Threshed tobacco - Quality inspection
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 Technical requirements ... 6 
4 Testing of moisture content ... 8 
5 Testing of lamina structure ... 9 
6 Testing of debris and detritus structures ... 10 
7 Testing of stem content in lamina ... 11 
8 Testing of density deviation rate in box (DVR) ... 11 
9 Testing of main chemical composition ... 12 
10 Testing of long stem content ... 13 
11 Testing of lamina (detritus) content in stem ... 14 
12 Mass testing ... 15 
13 Testing of sundries ... 15 
14 Testing of appearance ... 16 
15 Comprehensive determination ... 17 
Threshed tobacco - Quality inspection
1 Scope
This Standard specifies inspection methods and determination for quality of
tobacco leaf lamina, stem, debris and detritus (finished production) after
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/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 146, Leaf tobacco - Threshing and redrying - Technical specification
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
YC/T 162, Tobacco and tobacco products - Determination of chloride -
Continuous flow method
YC/T 217, Tobacco and tobacco products - Determination of Potassium -
Continuous flow method
YC/T 236, Tobacco and tobacco products - Nondestructive detection of strip
according to 2 boxes (bales). The space between the two sample boxes shall
be more than 20. After opening 15cm~20cm thick laminas, diagonally at the
quarter point, respectively take 30g~40g of samples. After mixing, put into a
sample container. Seal and store. Mark for spare use.
4.1.2 Samples of stem, debris and detritus
In the finished product warehouse, sample according to 2% for products of
same lot and same grade. When it is less than 100 boxes (bales), sample
according to 2 boxes (bales). The space between the two sample boxes shall
be more than 20. Then use a sampler to cut out 10cm~20cm thick tobacco stem,
debris and detritus. Extract about 100g of sample in each sample box (bale).
Respectively put into a sample container. Seal and store. Mark for spare use.
4.2 Testing of moisture content
4.2.1 Sample crushing
Start the grinder. After preheating by rotating mechanical friction, crush the
sample into smoke powder with a size less than 3mm. Dispense the crushed
smoke powder and put into a sample container. Immediately seal and mark.
Before crushing the sample, clean each component of the grinder, without any
pollution.
4.2.2 Testing of moisture content
In accordance with YC/T 31.
4.3 Determination
If the moisture content of sample meets the technical requirements in 3.1, it
shall determine that the moisture content indicator of this sample is conforming;
otherwise it shall be nonconforming. If the acceptability of the moisture content
indicator of this lot of products is greater than 95%, it shall determine that the
moisture content indicator of this lot of products is conforming; otherwise it shall
be nonconforming.
5 Testing of lamina structure
5.1 Sample preparation
In the finished product warehouse, sample according to 2% for products of
same lot and same grade. When it is less than 100 boxes, sample according to
2 boxes. The space between the two sample boxes shall be more than 20. Lift
up the strips with a thickness of about 10cm~20cm of the upper layer tobacco
box in one go. Then extract the whole piece of the strip. Each portion is
(3000±300)g. Respectively load into the sample container. Mark for spare use.
5.2 Testing of lamina structure
In accordance with GB/T 21137.
5.3 Determination
If the lamina structure of sample meets technical requirements of 3.1, it shall
determine that the lamina structure indicator of this sample is conforming;
otherwise it shall be nonconforming. If the acceptability of the lamina structure
indicator of this lot of products is greater than 85%, it shall determine that the
lamina structure indicator of this lot of products is conforming; otherwise it shall
be nonconforming.
6 Testing of debris and detritus structures
6.1 Sample preparation
In the finished product warehouse, sample according to 2% for products of
same lot and same grade. When it is less than 100 boxes, sample according to
3 boxes. The space between the two sample boxes shall be more than 20. Then
use a sampler to push aside 10cm~20cm thick debris and detritus on the
surface. Extract 100g~150g of samples in each sample box (or sack).
Respectively put into the sample container. Seal to store. Mark for spare use.
6.2 Instruments
6.2.1 Circular oscillation sorting sieve
When determining debris, use sieves of which clear bore diameters are Φ5mm,
Φ4mm, Φ3mm. When determining detritus, use sieves of which clear bore
diameters are Φ2mm, Φ1mm, Φ0.71mm.
6.2.2 Electronic scale
The resolution is 0.1g.
6.3 Operating steps
Pour all samples onto the circular oscillation sorting sieve. Vibrate 5min. Collect
samples at each grade of sieves. Respectively weigh their masses.
6.4 Calculation
Calculate the content of a specification of debris or detritus according to formula
In the finished product warehouse, sample according to 0.2% for products of
same lot and same grade. When it is less than 500 boxes, sample according to
1 box. The space between the two sample boxes shall be more than 200.
8.2 Testing method
In accordance with YC/T 236.
8.3 Determination
If the DVR indicator of sample meets technical requirements in 3.1, it shall
determine that the DVR indicator of this sample is conforming; otherwise it shall
be nonconforming. If the acceptability of the DVR indicators of this lot of
products is greater than 85%, it shall determine that the DVR indicators of this
lot of products are conforming; otherwise they shall be nonconforming.
9 Testing of main chemical composition
9.1 Testing items
The chemical composition tested includes:
- Total carbohydrates;
- Nicotine;
- Total nitrogen;
- Chlorine (Cl);
- Potassium (K).
NOTE: Add testing items according to the contract requirements.
9.2 Sample preparation
Excess sample in 4.1.1 of this Standard.
9.3 Testing method
Test total carbohydrates, nicotine, total nitrogen, chlorine and potassium
according to the following methods:
- Total carbohydrates: in accord...