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 Tbs                                               TDC3  (6746) P3 
    Second edition  
 
 
 
 
 
 
 
DRAFT  TANZANIA STANDARD  
 
 
Textiles — B-Twill Jute cloth — Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 Foreword  
This second edition  Draft Tanzania Standard  has been prepared in order to guide importers of B – Twill 
jute cloth used for manufacturing of Jute bags for packaging of food grains . 
 
In the preparation of this Draft Tanzania Standard  assistance was derived from:  
 
 IS 3667:1993,  B-Twill jute cloth — Specification  
 
In reporting the result of a test made in accordance with this Draft Tanzania Standard , if the final value 
observed or calculated is to be rounded off, it shall be done in accordance with TZS 4 (see clause 2).  
 
 
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 1. SCOPE  
This Draft Tanzania S tandard prescribes the constructional details and other particulars ofB -twill jute cloth 
used for the manufacture of jute bags for packing food grains.  
2. NORMATIVE REFERENCES  
The following referenced documents are indispensable for the app lication of this Draft Tanzania  
Standard.  
 
TZS 4, Rounding off numerical values  
 
TZS 20 Textiles — Woven or knitted fabrics — Determination of number of threads per centimetre . 
 
TZS 21 Textiles  — Determination of mass per unit length and per unit area of woven or knitted 
fabrics.  
 
TZS 22 Textiles — Determination of breaking load and extension of strips of woven fabrics.  
 
TZS 44 , Textiles — Woven or knitted fabrics — Determination of l ength and width.  
 
TZS 691 , The general labelling of all products manufactured from textiles.  
 
IS 9113  Jute sacking general requirement.  
 
IS 2969 Method for determination of oil content of jute yarn and fabric . 
 
3. TERMS AND DEFINITIONS.  
 
For the purpose of this Draft Tanzania Standard  the following terms and definitions shall apply:  
 
3.1 B -Twill cloth  
double warp 2/1 (jute yarns) twill weave.  
 
3.2 Lot  
all the bales of jute cloth bearing specified dimension and quality, with a definite length, delivered to one 
buyer against one dispatch note.  
 
3.3 Bale  
a rectangular or square pressed, sized package, containing jute cloth with outer layer stitched and bo und 
by metal straps.  
 
3.4 Ends  
the warp threads of the fabric.  
 
3.5 Porter  
the value obtained by counting the number of warp threads per full gauge length of 47 mm and dividing it 
by the number of warp threads per split.  
 
3.6 Picks (or shots)  
The weft or filling thread of a fabric.  
 
NOTE – shots per inch = picks per decimetre x 0.254   
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4. GENERAL REQUIREMENTS  
4.1 The B - Twill cloth shall be woven with jute yarn in double warp2/ 1 twill . The cloth shall be 
generally of uniform construction. Its selvedge should be firm and straight. The cloth shall have 
single blue stripe (or stripes) of single or double warp, as agreed to between the buyer and the 
seller, woven along the length of the cloth. Addition woven identification may be provided if 
required by the  purchaser.  
4.2 The fabric shall be free from the major weaving defects, such as holes, cuts tear and 
crushed selvedge. It should be generally free from biasness minor defects like floats, spots and 
stains.  
5. SPECIFIC REQUIREMENTS  
5.1 The B - twill cloth shal l conform to the requirements laid down in Table 1.  
5.2 The length of cloth in a bale shall not be less than the length specified or as agreed to 
between the buyer and the seller.  
Table 1 – Requirements for B -Twill cloth  
 
S/N  Characteristic  Requirement  Tolerance  Test Method  
1  Corrected mass min, 
(units)  
 595 +64  
-48  
TZS 21  
 
2  Mesh size  
a) Ends per dm  
b) Picks per dm   
73 
30 -  
TZS 20  
 
3  Dimensions , width, cm  57, 61 or 67.5  
 +4  
-0 TZS 44  
4  Breaking load, N, min  
(10cm ×20cm)  
a) Warp way: Average  
b) Weft way: Average   
 
1570  
1620  -  
 
TZS 22  
5  Moisture regain , %, max  22 - IS 9113:1992  
6  Oil content on dry de -
oiled material basis , %, 
max 0.8 - IS 2969:1974  
 
  
NOTE – The buyer and the seller may agree to the dimensions other  than those 
specified above.   However as for the agreed width, the tolerance of +4 -0 cm shall 
apply.  
 
 
 
 
 
 
  
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 Table 2 – Mass of B -Twill Jute cloth at different Moisture regain Values  
   
S/N  Moisture regain %  Mass in g/m2 
1  22  653  
2  20  643  
3  18  632  
4  16  622  
5  14  611  
6 12  600  
7 10  589  
8 8  579  
9 7  573  
10 6  568  
 
6. PACKING AND MARKING  
6.1 P acking  
The B -Twill jute cloth shall be packed in rolls or bales with specified length as agreed between the buyer 
and the seller.  
 
6.2 Marking   
The bales or rolls shall be marked as laid down in TZS 691 (see clause 2). Additional markings shall be 
made as stipulated by the buyer.  
 
7. CRITERIA FOR CONFORMITY  
The lot shall be considered as conforming to the requirements of this Draft Tanzania  Standard  if 
conditions specified in T able 1 are met.