Philippine National Standard

DPNS 166:2002

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.

DPNS 166:2002

DRAFT PHILIPPINE NATIONAL STANDARD DPNS 166:2002

Paper, board and pulps, Corrugating medium - Specification

1Scope

This standard specifies the requirements for corrugating medium used in forming the fluted portions of the corrugated fibreboard.

2References

The titles of the standard publications referred to in this standard are listed on the inside back cover.

3Definitions

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

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

4Classification

Corrugating medium shall be classified based on physical properties:

Class A

Class B

5Requirements

5.1Material

Corrugating medium shall be made of pulp and/or recycled fibre.

5.2Physical Properties

Corrugating medium shall conform to the physical property requirements specified in table 1.

Table 1 - Physical properties

Property

Requirement

Test method

Class / Class / Class / Class / Class / Class
A / B / A / B / A / B / A / B / A / B / A / B
Grammage, g/m²
Tol.: ±5% / 115 / 125 / 150 / 160 / 175 / 185 / PNS ISO 536
Thickness, mm
Tol.: ±0.03 mm / 0.20 / 0.23 / 0.26 / 0.28 / 0.31 / 0.33 / PNS ISO 534
Concora medium test (CMT), N, min. / 210 / 190 / 256 / 228 / 290 / 268 / 310 / 284 / 340 / 310 / 360 / 330 / PNS 326
TAPPI T 809
Ring crush resist-ance*, kN/m, min., CD / 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

* Test result from PNS 1268 (TAPPI T 818) which uses deflecting beam tester maybe different from TAPPI T 822 which uses rigid support.

5.3Form

The roll shall not be less than 1000 mm diameter with a maximum of two splices that are properly marked.

5.4Workmanship

The corrugating medium shall be free from imperfections which may affect its appearance and serviceability.

6Sampling

Sampling of corrugating medium for testing shall be made in accordance with PNS ISO 186.

7Test Methods

Test methods shall be as specified in Table 1.

8Marking and labeling

Every roll shall be stamped, as near to the center as possible, with the following:

8.1Name of commodity, "Corrugating medium"

8.2Grammage and Class

8.3Manufacturer's name and/or trademark and address

8.4"Made in the Philippines" or Country of origin (if imported)

8.5Size and mass of roll

8.6Length of roll

8.7Direction of unwind

DPNS 166:2002

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- Flat crush of corrugating medium (CMT Test)

(TAPPI T 809 om-93)

PNS 1268:2000- Ring crush of paperboard

(TAPPI T 818 om-87)

PNS ISO 186:2000 - Paper and board - Sampling to determine average quality

(ISO published 1994)

PNS ISO 534:2001 - Paper and board - Determination of the thickness of

(ISO published 1988)single sheets (and method of calculation of the apparent

density of board)

PNS ISO 536:2000- Paper and board - Determination of grammage

(ISO published 1995