TBS/CDC1 0 (1963) P3 
  
 
© TBS 20 20 All right Reserved                                                                 First Edition 20 20                                                                
  
DRAFT TANZANIA STANDARD  
 
 
 
 
 
 
 
 
TBS/CDC -10 (1963 ) P3 KRAFT LINER BOARD  — SPECIFICATION  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TANZANIA BUREAU OF STANDARD STBS/CDC1 0 (1963 ) P3 
 
© TBS 20 20 - All rights reserved                                                                       First Edition 2020                                                                    0   Foreword  
 
This Draft Tanzania Standard is being developed by Station ery and Paper  Products Technical 
Committee u nder supervision of the Chemical s Division al Standards Committee and it is in 
accordance with the procedures of the Bureau.  
 
Kraft liner board is a strong paper made from chemical pulping (sulphate / soda pulps ) and other 
pulps  used especially for the man ufacture of corrugated  fibreboard boxes  for general packaging 
and Kraft paper s. Kraft liner board is attached to the corrugating medium suitably to give the 
corrugated fibreboard  boxes  the desired quality.  
 
This Draft Tanzania Standard is the  first edition of Kraft liner board – Specification .  
 
This draft Tanzania Stan dard has been prepared with assistance drawn  from the following 
document s: 
 
IS 9588 :2014 Kraft liner - Specification,  published by India Bureau of Standards.  
 
IS 1763: 2018 Specification for substa nces of paper and pulp board, published by India 
Bureau of  Standards  
 
TZS 2146: 2018 - EAS 865: 2017  Corrugated fibre  board boxes for general packaging – 
Specification  
 
SANS431 :2007 Liners and fluting for corrugated board  - Specification,  publishe d by 
South African National Standard  
  
 
The assistance obtained fro m the above source  is hereby acknowledged with thanks.  
 
For the purp ose of deciding whether a particular requirement of this Tanzania Standard is 
complied with, the final value observed or cal culated, expressing the result of a test or analysis, 
shall be r ounded off in accordance with TZS 4  (see clause 2).  
 
 
 
 
                                                                          TBS/C DC10 (1963 ) P3  
 
©TBS 20 20 – All rights reserved                                                                                                   1  
 
DRAFT TANZANIA STANDAR D                TBS/CDC 1 0 (1963 ) P3 
 
Kraft liner board  – Specification  
 
1   Scope  
 
This draft Tanzania Sta ndard specifies the requirements,  sampling and test  methods  of Kraft liner 
board.  
  
2   Normative references  
 
The following documents, in whole or  in part, are normatively referenced in this document and are 
indispensable for its application. For dated re ferences, only the edition cited applies. For undated 
references , the latest ed ition of the referenced document (including any amendments) applies. ” 
 
             TZS 4:  Rounding off numerical value  
 
TZS 79: Paper – Dete rmination for bursting strength  
 
TZS 81:  Method for the determination of grammage ( basic mass)  
 
TZS 80: Pape r – Sampling methods for testing  
 
TZS 82: -ISO 187, Paper board and pulps — Standard atmosphere for conditioning and 
testing    and    procedure for monitoring the atmosphere and cond itioning of samples  
 
TZS 83: -ISO 287; Paper and board — Determ ination of mois ture content of a lot — 
Oven -drying method  
 
TZS 423: -ISO 535: Paper  and board — Determination of water absorptiveness - cobb 
method  
 
TZS 747: - ISO 1974, Paper — Determination o f tearing resistance — Elmendorf method  
 
 
TZS 891: -ISO 534; Pap er and board — Determination of thickness, density and specific 
volume  
 
ISO 5636/5 : Paper and board – Deter mination of air permeance (medium range) - Part 5 
(Gurley Method)  
 
ISO 6588 -1: Paper, board and pulps — Determination of pH of aqueous extr acts — Part 
1: Cold extrac tion 
 
            ISO 12192: Paper and Board - Determination of compressive strength – Ring Crush  
            method  
 
             ISO 9895: Paper and Board - Comp ressive strengt h – Short Span Test   
  ©TBS 20 20 – All rig hts rese rved   
3   Terms and d efinitions  
 
For the purpose  of this  draft Tanzania Standard the fo llowing definitions shall apply:  
 
3.1  bursting strength  
maximum uniformly distributed pressure, applied  at right angles to its surface, that  a test piece of  
paper o r board will stand, under specified test con ditions . 
 
3.2 cross direct ion (CD)  
direction in the  paper that is at right angles to the machine direction . 
 
3.3 defective  
set of test pieces that fails in one or more respects to comply with the relevan t requirements of 
the standard . 
 
3.4 grammage  (subst ance) 
the ma ss of unit are a 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. 
 
3.5 nominal gram mage (s ubstan ce) 
the value of the mass per unit area used f or reference  purposes (i.e . when purchasing material)  
 
3.6 actual  grammage (substance ) 
the value of the mass per unit area determined by testing  
 
3.7 Kraft liner  
any liner made almost ent irely from kraft  pulp. 
 
3.8 Liner  
any paper or paper board intended for covering  another paper  or paper board material to become 
part of finished product.  
 
3.9 long grain  
orientation when the machine direction of the paper is in the long direction of the sheet . 
 
3.10 lot  
one or more nominally identical package of paper, the paper ha ving been made  on the same 
equipment under essentially the same con ditions, from one manufacturer, and submitted at any 
one time for inspection and testing . 
 
3.11 machine direc tion (MD)  
direct ion in a paper or a board parallel to the direction of travel of  the web on th e paper or board  
machine . 
 
3.12 wood -free paper or bo ard 
paper or board having in principle only chemical pulp in its fibre composition; in practice, 
however, it  may contain a s mall amount of other  virgin  pulps  less than five per cent (< 5%).  
 
3.13 scuffin g 
become m arked by scrapping or brush ing   
©TBS 20 20 – All rights reserved                                                                                                    3    
4   Requir ements  
 
4.1 General requirements   
 
4.1.1  Kraft liner board shall be m ade  from 100 % bleached or unbleached sulphate pulp,  or 
combination of   any other material that will ensu re compl iance with the req uirements given in 
Table 1. It is known as virgin kraf t liner board.   
 
4.1.2 The surface shall be machine glazed (MG) or machine finished (MF) . The surface shoul d 
also be recept ive to printing.  Shall be resistant to scuffing.  
  
4.1.3 The ma terial if used  for the packaging of food materials, shall be manufac tured from virgin 
pulp and shall be free from dioxins.  
 
4.1.4 The papers shall be free from  fibre bundles,  tears,  shives, f oreign matter, specks, holes, 
blemishes, creases and  other  visible defects and  shall be uniform in texture.   
 
4.1.5 The paper shall be of reasonably good formation or uniform formation, thickness and 
substance.  
 
4.1.6 The surface of the pap er shall be such  as to accept the adhesives commonly used in the 
manufacture of corrugated boa rd. 
 
4.2 Specific requirements   
 
4.2.1 Kraft liner board  shall be manufactured  as per preferred  (standardized ) substances  given in 
Table 1.   
 
4.2.2 If a substance not given in T able 1 is  required, it shall be agreed  upon between the 
purchaser an d the suppli er and shall b e selected so that it confo rms to the steps of increment 
given  below : 
Range of substance                                                                  Steps of  increment of substance  
g/m2                                                                                                                                                                g/m2 
110 - 150                                                                                                  10 
Above 150                                                                                                25   
 
4.2.3 The minimum  allowable grammage  for kraft liner shall be 100 g/m2 and a tolerance  of ± 5 
percent shall not be permitted  on the 100 g/m2 when  tested in accordance  with TZS 81.   
 
4.2.4 Kraft liner boa rd shall comply w ith the relevant requirement given in Table 1 when tested in 
accordance with the method specified therein.  
 
 
 
                                                                          TBS/C DC10 (1963 ) P3  
 
©TBS 20 20 – All rights reserved                                                                                                   1  
Table 1 - Specific re quirements for Kraft liner boa rd 
 
 
 S/No.  Characteristic s Requirement s Test me thod 
(see clause  2) Product range  (Nominal grammage , g/m2) 
100 110 120 130 140 150 175 200 225 250 275 300 400 425 450 TZS 81  
i Actual  Gramma ge Nominal grammage , ± 5 %  
ii. Moistur e cont ent, 
%, m/m  6 - 8 TZS 83  
iii.  pH, min 5.00   ISO 6588 -1 
ix. R.C.T, KN/m,  CD, 
min 0.70 1.22 1.25 1.27 1.40 2.00 2.03 2.10 2.20  3.20 3.85 4.10 5.30 5.40 5.60 ISO 12192  
x. S.C.T,  KN/m,  CD, 
min 2.10 2.15 2.40 2.55 2.85 3.05 3.15 4.00 4.3 4.45 5.20 5.50 7.45 7.80 8.20 ISO 9895  
xi. Bulk, cc/g 1.60 - 1.70 TZS 891 
xii. Burst Stre ngth, 
KPa, min 420 435 500 560 600 715 750 855 900 1000 1170  1200  1350  1380  1430  TZS 79  
xiii. Burst Index, 
KPa.m2/g, Dry, min 3.5   
ix. Burst Index, 
KPa.m2/g, Wet, min 1.3 
x. Cobb  60 sec onds, 
g/m²,  270C, T op 
side,  max      30 TZS 423  
xi. Cobb 6 0 seconds , 
g/m²,   270C, W ire 
side, max      40                                                                          TBS/C DC10 (1963 ) P3  
 
©TBS 20 20 – All rights reserved                                                                                                   1 5 Dimensions  
 
The size of the rolls or sheets  form shall be as agreed betwee n 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 join ts shall be  joined properly using a suitable adhesive.  A suitable, nontoxic and 
environmentally friendly adhesive  shall be used  and shall be  adequa tely r esistant to moisture  and 
climatic conditions.  There  shall be not more than thre e join ts in a  roll.                                                                         TBS/C DC10 (1963 ) P3  
 
©TBS 20 20 – All rights reserved                                                                                                   1  
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 s elected  from t he lot sha ll first be examined  for th e requirements given 
in 4 and 5. Then a sheet of suit able s ize fro m rolls sh all be cut,  taking at least the top three 
layers. Test pieces shall then be cut from sheets for testing requireme nts mentioned in  4.1, 4.2 
and 5.  Tests for these  characteri stics e xcept pH shall be cond ucted individually on each of t he 
sample she et. A roll  or sheet n ot me eting the requirements for any one or more of these 
characteristics shall be considered as defect ive. Test for pH  shall be cond ucted on c omposite 
sample.  
 
6.3 Criteria for conformity   
 
A lot shall be declared as conf orming  to the  requireme nts of this  standard if the requirement s in 
clause 4 and 5 are satisfied and if the number of defective roll and s heets does not e xceed t he 
acceptance nu mber.  Th is acceptanc e numbe r shall depend on t he size of the sample and shall 
be equa l to 0 if the sam ple size is  less than 13. It shall be equal to 1 if the sample size is greater 
than or equal to 13. A roll or shee t not meeting th e requi reme nts for any one or mo re shall be 
conside red as defective.  
 
7   Test methods  
 
Samples of Kraft liner board shall be  conditione d in accordance with TZS 82 /ISO 187.  
 
8   Packaging and marking  
 
8.1 Packaging  
 
Packaging requirements will vary accord ing to the roll’s diame ter and w idth, Kraft liner b oard shall 
be packe d in rolls on a core of 7 5 to 100 mm in side di ameter and  in length equiva lent to the width 
of paper, with a wooden or plastic plug at each extending to a minimum of 75 mm  into the core.  
 
8.1.1 Kraft liner boa rd shall be packaged in suit able material that protects it from dust, moisture 
and dir t durin g transpor tation, sto rage a nd normal use.  
8.2 Marking  
 
8.2.1 Each  roll shall be legibly and indelibly marked with the foll owing:  
 
a) descript ion and the paper gramma ge (actu al);  
b) batch number or code number ; 
c) machine direction ; 
d) month and year of manuf acture; 
e) diameter and width o f roll;  
f) weight in  Kg of the roll including the mass of the core and plugs ;  
g) country of origin/man ufacture; and  
h) name and physical address of th e manufa cturer or lo cal dis tributor and reg istered 
trademark .    
 
 
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