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भारतीय मानक IS 11761 : 2024

Indian Standard

सीमेंट के लिए मल्टी-वॉि

पेपर के बोरे — लवलिलि
( दसू रा पनु रीक्षण )

Multi-Wall Paper Sacks for

Cement — Specification
( Second Revision )

ICS 55.080, 91.100.10

 BIS 2024

भारतीय मानक ब्यरू ो

BUREAU OF INDIAN STANDARDS
मानक भवन, 9 बहादरु शाह ज़फर मार्ग, नई ददल्ली - 110002
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI - 110002
www.bis.gov.in www.standardsbis.in

July 2024 Price Group 6

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Paper Based Packaging Materials Sectional Committee, CHD 16

FOREWORD

This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards after the draft finalized
by the Paper Based Packaging Materials Sectional Committee had been approved by the Chemical Division
Council.

Paper sacks are a good substitute for conventional jute bags since they are free from seepage and provide better
protection from moisture and air. However, care has to be taken while handling them during filling, storage, and
transportation as the use of hooks is strictly prohibited in this case. Palletization of filled paper sacks during their
handling and transportation gives them an added advantage over jute bags.

A scheme for labelling environment friendly products to be known as ECO Mark was introduced in the standard
at the instance of the Ministry of Environment, Forests and Climate Change (MoEF&CC). The ECO Mark is
administered by the Bureau of Indian Standards (BIS).

This Indian Standard was first published in 1986. At that time, the cement industry was at experimental stage with
these sacks and only valved-sewn-gusseted type paper sacks were in use in the country. Over the years, technology
evolved and other type of sacks were also manufactured in the country for packing cement. In first revision,
requirements for sacks with pasted end were included. Depending on the development in various fields,
requirements of materials, adhesives and drop test were also modified in first revision.

In this second revision, the following modifications have been incorporated:

a) The scope has been extended to include 25 kg, 30 kg and 40 kg pack sizes;
b) The references clause has been updated;
c) Requirements for material, construction and shape and dimension of sacks, and testing have also been
modified suitably as per latest practices;
d) A recommendatory clause for storage or conditioning of bags before usage has been incorporated; and
e) Packing and marking clause has been updated.

This standard contains 6.2.1 and 10.1.1 which call for agreement between the purchaser and the supplier.

The composition of the Committee responsible for the formulation of this standard is given in Annex B.

For the purpose of deciding whether a particular requirement of this 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
IS 2 : 2022 ‘Rules for rounding off numerical values (second revision)’. The number of significant places retained
in the rounded off value should be the same as that of the specified value in this standard.
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IS 11761 : 2024

Indian Standard
MULTI-WALL PAPER SACKS FOR CEMENT —
SPECIFICATION
( Second Revision )

1 SCOPE plies of sack kraft papers with aggregate substance

not less than 90 GSM with/without front fold inside
This standard specifies requirements, design and the mouth. The valve should have enough stiffness
construction, methods of sampling and test for for easy and faster opening of mouth while
multi-wall paper sack intended to use for packing mounting the sacks manually/automatically on the
20 kg, 25 kg, 30 kg, 40 kg and 50 kg of cement. filling-spouts. The dimensions of the valve paper
patch, its overall tear strength, its burst strength and
2 REFERENCES its reinforcement to the flaps at the valved-end with
The standards listed in Annex A contain provisions, adhesives should be adequate to resist any damage
which through reference in this text, constitute during cement-packing operations.
provisions of this standard. At the time of
5.2 Sewing Thread
publication, the editions indicated were valid. All
standards are subject to revision and parties to The thread used for sewing the sack shall be made
agreements based on this standard are encouraged to of natural or synthetic fiber or a combination of
investigate the possibility of applying the most these. The minimum breaking load of the thread
recent edition of these standards. shall be 68.5 N.
3 TERMINOLOGY 5.3 Adhesive
For the purpose of this standard, the definitions The adhesive shall be prepared through hot/cold
given in IS 9028 and IS 9042 shall apply. process by mixing dextrin, modified starch with
water in proper ratio to attain desirable dynamic
4 TYPES viscosity for tubing and bottoming operations. The
Multi-wall paper sacks shall be of the following prepared adhesive shall be treated suitably to resist
two types: microbial growth, shall be devoid of toxicity and pH
controlled to avoid discoloration of paper at the
a) Type 1 — Valved sewn-gusseted; and applied areas. The shear strength of the adhesive
b) Type 2 — Valved-pasted ends. bond shall not be less than the tensile strength of the
pasted papers. For paper to paper pasting at the
5 MATERIAL bottom-ends, tube-seams, the bond should be fiber-
tearing type.
5.1 Material to be used for construction of sacks
shall be either sack kraft paper or extensible kraft or 5.4 Sewing Tape
crimped paper or a combination of these.
The sewing tape used shall be of extensible kraft or
NOTE — In special case where the filled cementitious crepe tape of width 50 mm to 55 mm and shall be
aggregate is very hygroscopic in nature or if the filled sack glued to the outer ply along with a filler cord of the
is required to be stored in humid ambient condition for long same material of at least 8 mm width on either side.
period, then one of the intermediate/inner plies shall be
built-in as polyethylene extrusion-coated paper (PEC) or as
free poly-film liner (PFL). 6 CONSTRUCTION

5.1.1 The outer ply shall have a reduced slippage 6.1 The sack shall be made of two or more well
characteristic for the ease of stacking of filled nested plies of the type of paper as specified in 5.1
cement bags. The coefficient of friction (CoF), µ of and 5.1.1 the combination of the papers in the sack
the outer surface of the outer paper-ply shall be more giving a total minimum tensile energy absorption
than 0.47 that is, the angle of slide > 25 ° when tested (TEA in J/m2) values in machine direction (MD) and
as per ISO 15359. For demanding type of coefficient cross direction (CD) for individual ply shall be
of friction (CoF) either embossed paper or colloidal tested to calculate mean TEA value per ply (the
silica solution applied paper shall be used. arithmetic mean or geometric mean where MD and
CD values are almost equal that is, the paper is
5.1.2 The valve paper-patch of valved-pasted end square in strength) or balanced TEA value per ply
multi-wall paper sack can be of single ply or double (determined when MD value is much more than CD

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IS 11761 : 2024

value; in such cases combinations of weighted dimensional tolerances of a multi-wall paper sack
factors for example, 0.31 and 0.69 for 2 ply, 0.37 and shall be ± 0.5 cm, ± 1.0 cm and ± 0.5 cm on flat sack
0.63 for 3 ply, 0.43 and 0.57 for 4 to 6 ply width, length and bottom/valve/gusset width
constructions are multiplied to MD-TEA and CD- respectively.
TEA values and then added). The total of the
NOTE — The valve width is always dependent on the
individual mean or balanced TEA values of the non- diameter of the filling-spout; the valve mounting on the
free plies in the sack construction (range: 300 J/m2 filling spout should not be too tight or too loose in order to
to 600 J/m2 depending on net mass content, facilitate trouble free release of filled sack (due to swiveling
categorization of handling conditions as down action of the saddle-chair/of the filling-spout. The
location of the center of mass in the filled bag gets greatly
normal/tough/extra tough) is an important parameter affected by the extent to which the spout and the saddles are
which can be correlated for sack performance with inclined downwards, sufficiency of saddle-height to
respect to rigor and frequency of material handling properly accommodate the filled length of the sack.
from cement packing section to the end user’s point.
6.2.2 The filled dimensions of the sack (as
NOTE — TEA values (can be derived from the covered area
under stress vs strain or tensile strength vs elongation curve
determined by the flat dimensions of the empty sack
till the breaking load) are primarily dependent on and the characteristics of the packed material) shall
orientation of the cellulose fibers, their intrinsic strengths, not exceed the corresponding dimensions of the
inter-fiber fibril meshing, sheet formation, ionic charges of discharge chutes (diverting, spiral), hinder smooth
the bond, extent of transverse shrinkages upon free drying
affecting the CD stretch, mechanical micro
orderly movement on the conveyors; also, the filled
crimping/compacting along machine direction affecting the dimensions shall be compatible for proper loading
MD-stretch etc TEA-CD is the dominant strength parameter and stacking on the truck, inside the wagon and
(always higher weighted factors are applied as can be seen palletization etc.
above).
6.3 Ends
6.1.1 The other properties of the kraft paper shall be
as under Table 1. 6.3.1 Both ends of valved-sewn-gusseted sacks shall
be attached with glued crepe or extensible paper tape
6.2 Shape and Dimensions and then sewn with the sewing thread with the
reinforcing filler cord. There shall be 9 to 12 stitches
6.2.1 The sack shall be of either the valved-sewn-
per 10 cm length of stitching.
gusseted type or valved-pasted ends type and of
dimensions as shown in Fig. 1 and Fig. 2 6.3.2 Both ends of valved-pasted ends sacks shall be
respectively. The length of the sack may vary and pasted with adhesive as specified in 5.3.
shall be specified by the purchaser. The normal

Table 1 Requirements of Kraft Paper

(Clause 6.1.1)

Sl No. Characteristic Requirements Methods of Test, Ref to

(1) (2) (3) (4)
i) Elongation at break, percent, Min IS 1060 (Part 5/Sec 6)
MD 2.5
CD 4.5
ii) Tear factor, mN.m2/g, Min IS 1060 (Part 6/Sec 1)
MD 100
CD 120
iii) Gurley porosity, μm/(Pa⋅s), Min 25 IS 1060 (Part 5/Sec 14)
NOTE — In order to provide optimum total TEA value to the sack construction, care should be taken to maintain minimum
dissimilarities amongst inter ply directional elongation percentages at break.
Higher tear factors contribute greatly to the sack performance if the sacks are subjected to extra tough handling situations (for
example, long distance transportation by rail together-with pre and post multi handling, loading to and unloading from wagon (whose
floor and walls are devoid of/ inadequately covered with protective cushioning packing liners) is manual/semi-manual, where risks
of tearing exist.
Air permeability of a sack depends on combinations of individual gurley porosity value of the plies, mechanical micro-perforations
(hole-diameter, number of holes and pattern of repetition determine the extent of open area) on all the plies collectively as vent holes
(VH) and/or individually on the desired plies in full body staggered manner (FBSP). Higher air permeability with minimal/without
VH is essential to pack cement having higher percent of fly ash in composition and with high fineness (beneficial for packing speed,
lesser energy consumption in de-dusting, cleanliness of the environment and the sack).

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IS 11761 : 2024

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IS 11761 : 2024

7 WORKMANSHIP 9 ADDITIONAL REQUIREMENTS FOR ECO-

MARK
The plies shall be properly but not excessively
creased. In the construction of the sack tube, the 9.1 General Requirements
outer ply fit shall be such that at the point of
manufacture, each ply shall be smaller in 9.1.1 The product shall conform to the requirements
circumference than the next outer ply within the for quality and performance prescribed under 5 to 8.
elongation limits of the material in order to ensure;
even load distribution between the plies. Care shall 9.1.2 The manufacturer shall produce to BIS, the
be taken to ensure adequate longitudinal overlap, environmental consent clearance from the
equal gusset formation and spot gluing quantity and concerned State Pollution Control Board as per the
line of gluing. provisions of Water (Prevention and Control of
Pollution) Act, 1974 and Air (Prevention and
8 TESTING Control of Pollution) Act, 1981 along with the
authorization, if required under the Environment
8.1 Sampling shall be as per procedure laid down in (Protection), Act, 1986 and the Rules made
IS 10528. thereunder, while applying for ECO-Mark.

8.2 Conditioning 9.1.3 Specific Requirements

The paper sack samples from the lot (which are air 9.1.3.1 The material shall be of the following two
dried (AD) by the supplier; moisture should ideally types depending on the raw material used in the
not exceed 10 percent on AD basis) for testing shall manufacture:
be conditioned as per IS 1060 (Part 4/Sec 1).
a) Manufactured from pulp containing not less
8.3 Drop Test than 60 percent by mass of pulp made from
materials other than bamboo, hardwood,
8.3.1 Ten sacks shall be taken from a lot of sacks softwood and reed; and
offered for testing. The sacks shall be conditioned
and filled as per the details given in IS 11052. Each b) Manufactured from pulp made from
sack shall then be subjected to the sequential drops; 100 percent waste paper or agricultural/
one drop each on front side, back side, right side, left industrial waste.
side, bottom and top.
10 PACKING AND MARKING
8.3.2 The drop height shall be 0.85 m for the first
two drops (that is, front and back sides) and 0.3 m 10.1 Packing
for drops on the remaining sides.
10.1.1 Paper sacks shall be bundled and suitably
8.3.3 The sacks shall be examined for bursting packed in waterproof material or as agreed upon
leading to seepage of the contents at the end of each between the purchaser and the supplier, for supply.
drop. The lot shall be considered passing if not more
10.1.2 The ECO-Marked packaging material/
than one sack shows failure in bursting leading to
package may be sold along with instructions for
seepage. The lot shall be considered failing if more proper use and mode of safe disposal so as to
than two sacks show failure in bursting leading to maximize its performance and minimize wastage.
seepage. However, if two sacks show failure in
bursting, a second set of 5 sacks from the same lot 10.2 Marking
shall be tested and if more than one show failure in
bursting leading to seepage, the lot shall be 10.2.1 Each sack shall be marked with the following
information printed on it:
considered failed.
a) Relevant product details along with the
8.4 The confirming lot of paper sacks should either name of the product manufacturer;
be stored in conditioned atmosphere or be b) Batch number or lot number;
conditioned prior to usages (that is, humidify during
dry weather or dehumidify during rainy/moist c) Net mass of the contents; and
weather).

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IS 11761 : 2024

d) ‘Use no hand hooks’, and ‘keep away from 10.3.3 Additional Requirements for ECO-Mark
rain’ preferably showing the corresponding
pictorial illustration as per IS 1260 (Part 2). For ECO-Mark, following additional information
may also be suitably marked on the container/
10.3.1 The sacks may also be marked with the package:
following information:
a) Each sack may display in brief the criteria
a) ‘Do not drop’, preferably showing the
for which the product has been labelled as
pictorial illustration; and
environment friendly; and
b) ‘Do not drop on edges, corners and ends’,
preferably showing the corresponding b) It shall be suitably marked on each sack
pictorial illustration. that ECO-Mark label is applicable only to
the packaging material/package if content
10.3.2 BIS Certification Marking is not separately covered under the ECO-
Mark scheme.
The product(s) conforming to the requirements of
this standard may be certified as per the conformity NOTE — It may be stated that the ECO-Mark is
assessment schemes under the provisions of the applicable to the product or packaging material or
Bureau of Indian Standards Act, 2016 and the both.
Rules and Regulations framed there under, and the
products may be marked with the Standard Mark.

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IS 11761 : 2024

ANNEX A
(Clause 2)
LIST OF REFERRED STANDARDS

IS No. Title IS No. Title

IS 1060 Methods of sampling and IS 1260 (Part 2) : Packaging — Distribution

test for paper and allied 2020 packaging — Graphical
products: symbols for handling and
(Part 4/Sec 1) : Methods of test for paper, storage of packages: Part 2
2014/ISO 187 : board and pulps, Section 1 General goods (fourth
Standard atmosphere for revision)
1990
conditioning and testing IS 9028 : 1978 Glossary of terms relating
and procedure for to paper sacks
monitoring the
atmosphere and IS 9042 : 1978 Method of measurement
conditioning of samples and expression of the
dimensions of paper sacks
(Part 5) Methods of test for paper IS 10528 : 1983 Method of sampling empty
and board paper sacks for testing
(Sec 6) : 2014/ Determination of tensile IS 11052 : 2023 Methods of drop test for
ISO 1924-2 : properties — Constant rate shipping paper sacks (first
2008 of elongation method revision)
(20 mm/min)
ISO 15359 : 1999 Paper and board —
(Sec 14) : 2014/ Determination of air Determination of the static
ISO 5636-5 : permeance and air and kinetic coefficients of
2013 resistance (medium range) friction — Horizontal
— Gurley method plane method
(Part 6/Sec 1) : Methods of test for paper,
2014/ISO 1974 : Section 1 Determination of
2012 tearing resistance —
Elmendorf method

To access Indian Standards click on the link below:

https://www.services.bis.gov.in/php/BIS_2.0/bisconnect/knowyourstandards/Indian_standards/isdetails/

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IS 11761 : 2024
ANNEX B
(Foreword)
COMMITTEE COMPOSITION
Paper Based Packaging Materials Sectional Committee, CHD 16

Organization Representative(s)

Indian Institute of Packaging, New Delhi PROF (DR) TANWEER ALAM (Chairperson)

B&A Packaging India Limited, Kolkata SHRI AMAL KUMAR MOHANTY

SHRI TAPAN KR CHAND (Alternate I)
SHRI PANKAJ KUMAR (Alternate II)

Central Pulp and Paper Research Institute, Saharanpur DR M. K. GUPTA

DR SANJAY TYAGI (Alternate)

Century Pulp and Paper Mills, Nainital SHRI SANJAY KUMAR YADAV
SHRI HEM CHANDRA JOSHI (Alternate)

Consumer Guidance Society of India, Mumbai DR SITARAM DIXIT

DR M. S. KAMATH (Alternate)

Dr. Reddy's Laboratory, Hyderabad SHRI AVINASH KUMAR TALWAR

SHRI VINAY KUMAR SINGH (Alternate)

Federation of Corrugated Box Manufacturers of India, SHRI K. P. SINGH

Mumbai SHRI ALOK KUMAR GUPTA (Alternate)

Federation of Paper Converters of India, New Delhi SHRI MUKESH GUPTA

SHRI ABHAY KUMAR SINGH (Alternate)

ITC Life Sciences and Technology Centre, Bengaluru SHRI AJITH KUMAR
DR KAMAL KUMAR TYAGI (Alternate)

ITC Limited, Paperboards and Specialty Papers SHRI P. N. SRIDHARR

Division, Bhadrachalam SHRI MOHAMMED GOUSE (Alternate)

Indian Agro and Recycled Paper Mills Association, DR BIPIN PRAKASH THAPLIYAL
New Delhi DR ANIL NAITHANI (Alternate)

Indian Institute of Packaging, New Delhi SHRI SUBODH K. JUIKAR

SHRI TUSHAR BANDYOPADHYAY (Alternate I)
SHRI SOURABH GHOSH (Alternate II)

Indian Institute of Technology, Roorkee DR DHARAM DUTT

DR VIBHORE KUMAR RASTOGI (Alternate I)
DR KIRTIRAJ K. GAIKWAD (Alternate II)

Indian Paper Manufacturers Association, New Delhi SHRI BISWARANJAN DASH

SHRI ROHIT PANDIT (Alternate)

J K Paper Limited, New Delhi SHRI UMAKANT PATIL

SHRI SAMEER MOHAPATRA (Alternate)

Nestle India Limited, Gurugram SHRI DEEPAK SINGH

SHRI AJAY RAJVANSHI (Alternate)
Package Design Research and Test Lab, Lucknow SHRI L. M. GUPTA
SHRI MAYANK GUPTA (Alternate)

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IS 11761 : 2024

Organization Representative(s)

Parksons Packaging Limited, Mumbai SHRI SRIKANTH RAMAMURTHY

SHRI DEEPAK SINGH (Alternate I)
SHRI RAVINDRA PATIL (Alternate II)

Prem Industries, New Delhi SHRI ALOK GOEL

SHRI H. P. SINGH (Alternate I)
SHRI RAGHAV GOEL (Alternate II)

Rail India Technical and Economic Service, Gurugram SHRIMATI MALINI SAHA

Tetra Pak India Private Limited, Gurugram SHRI SHARAD SHARMA

SHRI BOBBY JOHNSON (Alternate)

Uflex Limited, Noida SHRI ASHVANI SHARMA

SHRI RAKESH SHARMA (Alternate)

BIS Directorate General SHRI AJAY KUMAR LAL, SCIENTIST ‘F’/SENIOR

DIRECTOR AND HEAD (CHEMICAL) [REPRESENTING
DIRECTOR GENERAL (Ex-officio)]

Member Secretary
SHRI VIRENDRA SINGH
SCIENTIST ‘E’/DIRECTOR
(CHEMICAL), BIS

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Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 2016 to promote harmonious
development of the activities of standardization, marking and quality certification of goods and attending to
connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without
the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the
standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to
copyright be addressed to the Head (Publication & Sales), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed
periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are
needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards
should ascertain that they are in possession of the latest amendments or edition by referring to the website-
www.bis.gov.in or www.standardsbis.in.
This Indian Standard has been developed from Doc No.: CHD 16 (19784).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

BUREAU OF INDIAN STANDARDS

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