TBS/CDC1 0(1964 ) P3 
  
 
© TBS 2019 All right Reserved                                                                 First Edition 2019                                                                
  
DRAFT TANZANIA STANDARD  
 
 
 
 
 
 
 
 
TBS/CDC -10 (1964 ) P3 KRAFT  PAPER  — SPECIFICATION  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TANZANIA BUREAU OF STANDARD STBS/CDC10  (1964 ) P3 
 
© TBS 20 19 - All rights reserved                                                                       First Edition 2009                                                                     0   Foreword  
 
This Draft Tanzania Standard is being developed by Station ery and Paper  Products Technical 
Committee under s upervision of the Chemical s Division al Standards Committee and it is in 
accordance with the procedures of the Bureau.  
 
 
This Draft Tanzania Standard is the  first edition of Kraft  paper – Specification .  
 
This draft Tanzania Standard has been prepared with assistance drawn  from the following 
document s: 
 
 
IS 1397 :2013 Kraft Paper - Specification,  published by India Bureau of Standards.  
 
TZS 2569 :2019 /EAS 930: 2019  Paper and Board food contact material -Specification 
published  by Tanzania Bureau of Standards  
 
IS 1763: 2018 Specification for substances of paper and pulp board, published by India 
Bureau of Standards  
 
 
The assistance obtained from the above source is hereby acknowledged with thanks.               
 
For the purpose of deciding whether a particular r equirement of this Tanzania Standard is 
complied with, the final value observed or calculated, expressing the result of a test or analysis, 
shall be rounded off in accordance with TZS 4 - 
 
 
 
 
                                                     TBS/CDC10( 1964 ) P3   
 
©TBS 20 19 – All rights reserved                                                                                                   1  
 
DRAFT TANZANIA STANDARD                TBS/CDC 1 0 (1964 ) P3 
 
Kraft Paper – Specification  
 
1   Scope  
 
This draft Tanzania Standard specifies the requirements,  sampling,  and test  methods  of Kraft  
paper  for manufacture of wrapping  and general pa ckaging  purpose  
 
 
2   Normative references  
 
The following documents, in w hole or in part, are normatively referenced in this document and are 
indispensable for its application. For dated references, only the edition cited applies. For undated 
references, the latest edition of the referenced document (including any amendments) a pplies.”  
 
TZS 4:  Rounding off numerical values  
 
TZS 79: - ISO 2758 : Paper – Dete rmination for bursting strength  
 
TZS 80: Paper – Sampling methods for testing  
 
             TZS 81:  Method for the determination of grammage ( basic mass)  
 
TZS 82 : - ISO 187, Paper board and pulps — Standard atmosphere for conditioning and 
testing    and    procedure for monitoring the atmosphere and conditioning of samples  
 
TZS 83: -ISO 287 ; Paper and board — Determination of moisture content of a lot — 
Oven -drying method  
 
TZS 84: Paper and board – Determination of opacity (paper backing) – Diffuse 
reflectance method  
 
TZS 423: -ISO 535 ; Paper and board — Determination of water absorptiveness - cobb 
method  
  
TZS 747: - ISO 1974 , Paper — Determination of tearing resistance — Elmend orf method  
 
TZS 748 -2: - ISO 1924 -3, Paper and board — Determination of tensile properties —- Part 
3: Constant rate of elongation method (100 mm/min)  
 
TZS 886: -ISO 2470 : Paper and board – Measurement of blue reflectance factor (ISO 
brightness)  
 
TZS 891: -ISO 534 ; Paper and board — Determination of thickness, density and specific 
volume  
 
ISO 6588 -1: Paper, board and pulps — Determination of pH of aqueous extracts — Part 
1: Cold extraction  
  
  ©TBS 20 19 – All rights reserved   ISO 13914, Soil quality — Determination of dioxins and furans and di oxin-like 
polychlorinated biphenyls by gas chromatography with high -resolution mass selective 
detection (GC/HRMS)   
©TBS 20 19 – All rights reserved                                                                                                    3   3   Terms and d efinitions  
 
For the purpose of this  draft Tanzania Standard the fo llowing definitions shall apply:  
 
3.1  bursting strength  
 
maximu m uniformly distributed pressure, applied  at right angles to its surface, that a test piece of 
paper o r board will stand, under specified test conditions  
 
3.2  Kraft paper   
 
paper manufactured from bleached or unbleached pulp, recycled fibres and non -wood in 
combination with sulphate pulp  and having the desired properties  as laid down in this standard . 
 
3.3 cross direction (CD)  
 
direction in the paper that is at right angles to the machine direction  
 
3.4 defective  
 
set of test pieces that fails in one or more  respects to comply with the relevant requirements of 
the standard  
 
3.5 grammage  (substance)  
 
mass of unit area of paper or board  determined by the  specified method of test and expressed in 
grams per square meter  and conditioned in accordance with TZS 82/ ISO 187  
 
3.6 nominal grammage (substance)  
the value of the mass per unit area used for reference purposes (i.e. when purchasing material)  
 
3.7 actual grammage (substance)  
the value of the mass per unit area determined by testing  
 
3.8 long grain  
orientation  when the machine direction of the paper is in the long direction of the sheet  
 
3.9 lot  
one or more nominally identical package of paper, the paper having been made on the same 
equipment under essentially the same conditions, from one manufacturer, and su bmitted at any 
one time for inspection and testing . 
 
3.10 machine direction (MD)  
direction in a paper or a board parallel to the direction of travel of the web on the paper or board  
machine  
 
3.11 sizing  
 
the addition of materials in the pulp stock or on t he surface of the sheet (surface sizing) in order 
to increase paper resistance to the spontaneous penetration of aqueous liquids and its resistance 
to the surface spreading of such liquids . 
 
 
 
  
  ©TBS 20 19 – All rights reserved    
4   Requirements  
 
4.1 General requirements  
 
4.1.1  Kraft pape r shall be in three  types , A, B and C : 
 
4.1.1.1  Type A is made from 100 %  sulphate pulp ( bleached or unbleached ) ,  or from  
combination of  any other material that will ensure compl iance with the requirements given in 
Table 1. Type A is known as virgin bag kraft paper .   
 
4.1.1.2  Type B may be made from 100% waste paper or combination of waste paper and 
agricultural waste or any other material that will ensure compl iance with the requirements  given in 
Table 1 .Type B is known as recycled   bag kraft paper .   
 
4.1.1.3  Type C may be made from non-wood   in combination   with sulphate pulp or any other 
material that will ensure comp liance  with the requirements given in Table 1 .  Type C is known as  
semi - virgin bag kraft liner paper .   
 
4.1.2 The surface shall be  machine glazed (MG) or machine finished (MF) . The surface should 
also be receptive to printing.  
  
4.1.3 The material if used for the packaging of food materials, shall be manufactured from virgin 
pulp or recycled material and shall be free from dioxins as per TZS 2 569. 
 
4.1.4 The surface of the paper shall be such as to accept the adhesives commonly used in the 
manufacture of corrugated board.  
 
4.1.5 The papers shall be free from  fibre bundles,  tears,  shives, foreign matter, specks, holes, 
blemishes, creas es and other  visible defects and shall be uniform in texture.   
 
4.1.6 The paper shall be of  reasonably good formation or uniform formation, thickness and 
substance.  
 
4.2 Specific requirements   
 
4.2.1 Kraft paper shall be manufactured as per  the following preferred  substances and 
requirements given in Table 1.   
 
Range of substance                                                                   Steps of increment of substance  
g/m2                                                                                                                                                                g/m2 
52 - 60                                                                                                       4 
60 - 80                                                                                                       5 
80 -100                                                                                                     10 
4.2.3 Kraft paper  shall comply with the relevant requirement given in Table 1 when tested in 
accordance with the method specified ther ein. 
 
  
©TBS 20 19 – All rights reserved                                                                                                    5   Table 1 – Specific requirement for Kraft paper  
 
S/No.  Characteristic  Requirement  Test method  
(see clause 2)  Product range  (Nominal grammage , g/m2) 
i. Grammage, g/m2, ± 5 % 52 – 100 
 TZS 81  
ii. Moisture content, %, m/m  6 – 7.5 TZS 8 3  
iii. pH, Mi n 5.5   ISO 6588 -1 
iv. Tensile index ,Nm/g , MD, min.  Type A  Type B  Type C  TZS 748 -2  
65 29.5 44.O  
v.  Tensile  index , Nm/g , CD, min. 34.5 15.5 24.5 
vi. Tear  index , mNm2/g, MD, 
min 7.0  
TZS 747  
vii. Tear index , mNm2/g, CD, min 9.0 
viii. Bulk, cc/g 1.5 - 1.9 TZS 891 
ix. Porosity (Bendtsen), m L/min, 
min 150 ISO 5635 -5 
x. Burst Index, KPa.m2/g, Dry, 
min 1.8  
 TZS 79  
xi. Cobb 60 seconds,  g/m²,  
270C, Top side , Max      28 TZS 423   
xii. Cobb 60 seconds,  g/m²,  
270C, W ire side , Max      30 
 
 
 
5 Dimensions  
 
The size of the sheets or rolls shall be as agreed between  the purchaser and the supplier.  The 
permissible tolerance on the size shall be  in accordance with  clause 4 of TZS 63 .  
 
 
5.1 Joints  
 
All joints shall be joined properly using a suitable  adhesive . A suitable, nontoxic and 
environmentally friendly adhesive shall be used and shall be adequately resistant to moisture and 
climatic conditions . There shall be not more than three joints in a roll.  
 
 
 
 
 
  
  ©TBS 20 19 – All rights reserved   6   Sampling  
 
6.1 Sampling methods shall be carri ed out as prescribed in TZS 80 .  
 
6.2 Number of Tests  
 
Each of the rolls/packages selected  from the lot  shall first be examined for the requirements given 
in 5 and 4.2. Then a sheet of suitable size from rolls shall be cut, taking at least the top three 
layers. Test pieces shall then be cut from sheets for testing requirements mentioned in 4.1, 4.2 
and 5.  Tests for these characteristics  except pH shall be conducted  individually on each of the 
sample  sheet. A roll or sheet not meeting the requiremen ts for any one or more of these 
characteristics shall be considered as defective. Test for pH shall be conducted on composite 
sample.  
 
6.3 Criteria for conformity   
 
A lot shall be declared as conforming to the requirements of this this standard if the req uirement s 
in clause  4.2  are satisfied and if the number of defective roll and sheets does not exceed the 
acceptance number.  This acceptance number shall depend on the size of the sample and shall 
be equal to 0 if the sample size is less than 13. It shal l be equal to 1 if the sample size is greater 
than or equal to 13.   
 
7   Tests methods  
 
Samples of bag Kraft paper shall be conditioned in accordance with TZS 82 /ISO 187.  
 
8   Packaging and marking  
 
8.1 Packaging  
 
8.1.1  Packaging requirements will vary ac cording to the roll ’s diameter and width , bag Kraft paper  
shall be packed in rolls on a core of 7 5 to 100 mm inside diameter and in length equivalent to the 
width of paper, with a wooden  or plastic plug  at each extending to a minimum of 75 mm into the 
core.   
 
8.1.2 When supplied in sheets p ackages shall contain 500 or 250  sheets according to the size 
and weight of the paper or packed  as agreed between the purchaser and the supplier.  
 
8.1.3 Bag Kraft paper shall  be packaged in suitable material that protect s it from dust, moisture 
and dirt during transportation, storage and normal use.  
 
8.2. Marking  
 
8.2.1 Each  roll, ream or  package shall  be legibly and indelibly marked with the following:  
 
a) Description, type of the  kraft paper  and the paper grammage (actual);   
b) Batch number or code number ; 
c) Month and year of manufacture;  
d) Machine direction;  
e) Size of sheet or of roll; 
f) Weight in  Kg of the roll including the mass of the core and plugs ; 
g) country of origin/manufacture ; 
h) name and physical address of the manufacturer or local distributor and registered 
trademark .  
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