DRAFT PHILIPPINE NATIONAL STANDARD
DPNS 166:2002
Foreword
This Philippine National Standard specification for corrugating medium was prepared by
the Technical Committee on Paper, Board and Pulps of the Bureau of Product Standards,
BPS/TC 21.
This standard is revised to include two classes of corrugating medium presently available
in the market.
All units in this standard are expressed in SI units.
DRAFT PHILIPPINE NATIONAL STANDARD
Paper, board and pulps, Corrugating medium - Specification
1
DPNS 166:2002
Scope
This standard specifies the requirements for corrugating medium used in forming the fluted
portions of the corrugated fibreboard.
2
References
The titles of the standard publications referred to in this standard are listed on the inside back
cover.
3
Definitions
For the purpose of this standard, the following terms and definitions apply:
3.1
corrugated fibreboard
a board consisting of one or more sheets of fluted paper stuck to a flat sheet of paper or
between several sheets. It can be single face, single wall, double wall, or triple wall
3.2
corrugating medium
fluting medium
a paper used in forming the fluted portion of the corrugated fibreboard also known as fluting
medium
3.3
concora medium test (CMT)
a measure of the crushing resistance of a laboratory fluted strip of corrugating medium
3.4
flute or corrugation
the configuration of the undulations in fluted paper
3.5
grammage
the mass of a unit area of paper or board expressed in grams per square metre
3.6
pulp
the fibrous material, generally of natural vegetable origin, made ready for use in further
manufacturing processes
3.7
recycled fibre
secondary fibre
any fibrous material that has already undergone a manufacturing process and is being recycled
as the raw material for another manufactured product
DPNS 166:2002
3.8
ring crush resistance
the compressive force sustained by the specimen held in ring form in a special jig. It
correlates with edgewise compressive strength which is a principal element in determining the
box compression strength
3.9
thickness (of a single sheet of corrugated fibreboard)
the distance between two plane parallel surfaces of a micrometer between which a test piece is
subjected to the specified pressure
4
Classification
Corrugating medium shall be classified based on physical properties:
Class A
Class B
5
Requirements
5.1
Material
Corrugating medium shall be made of pulp and/or recycled fibre.
5.2
Physical Properties
Corrugating medium shall conform to the physical property requirements specified in table 1.
Table 1 - Physical properties
Property
Class
A
B
Class
A
B
Requirement
Class
Class
A
B
A
B
Class
A
B
Class
A
B
Test
method
Grammage, g/m²
PNS ISO 536
Tol.: ±5%
115
125
150
160
175
185
Thickness, mm
PNS ISO 534
Tol.: ±0.03 mm
0.20
0.23
0.26
0.28
0.31
0.33
Concora medium
test (CMT), N,
210 190 256 228 290 268 310 284 340 310 360 330 PNS 326
TAPPI T 809
min.
Ring crush resistance*, kN/m,
0.90 0.70 1.05 0.80 1.26 1.05 1.34 1.15 1.49 1.30 1.60 1.40 PNS 1268
TAPPI T 818
min., CD
* Test result from PNS 1268 (TAPPI T 818) which uses deflecting beam tester maybe different from TAPPI T
822 which uses rigid support.
5.3
Form
The roll shall not be less than 1000 mm diameter with a maximum of two splices that are
properly marked.
2
DPNS 166:2002
5.4
Workmanship
The corrugating medium shall be free from imperfections which may affect its appearance and
serviceability.
6
Sampling
Sampling of corrugating medium for testing shall be made in accordance with PNS ISO 186.
7
Test Methods
Test methods shall be as specified in Table 1.
8
Marking and labeling
Every roll shall be stamped, as near to the center as possible, with the following:
8.1
Name of commodity, "Corrugating medium"
8.2
Grammage and Class
8.3
Manufacturer's name and/or trademark and address
8.4
"Made in the Philippines" or Country of origin (if imported)
8.5
Size and mass of roll
8.6
Length of roll
8.7
Direction of unwind
3
References
DPNS 166:2002
The following standards contain provisions, which through reference in the text form
part of this national standard. At the time of publication of this PNS, the editions
indicated were valid:
PNS 326:2001
(TAPPI T 809 om-93)
- Flat crush of corrugating medium (CMT Test)
PNS 1268:2000
(TAPPI T 818 om-87)
- Ring crush of paperboard
PNS ISO 186:2000
(ISO published 1994)
- Paper and board - Sampling to determine average quality
PNS ISO 534:2001
(ISO published 1988)
- Paper and board - Determination of the thickness of
single sheets (and method of calculation of the apparent
density of board)
PNS ISO 536:2000
(ISO published 1995
- Paper and board - Determination of grammage