ISO/DIS 12635

Graphic technology -- Plates for offset printing -- Dimensions

Technologie graphique -- Plaques pour impression offset -- Dimensions

Standards Content (sample)

DRAFT INTERNATIONAL STANDARD
ISO/DIS 12635
ISO/TC 130 Secretariat: SAC
Voting begins on: Voting terminates on:
2020-10-22 2021-01-14
Graphic technology — Plates for offset printing —
Dimensions
Technologie graphique — Plaques pour impression offset — Dimensions
ICS: 37.100.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
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STANDARD UNTIL PUBLISHED AS SUCH.
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This document is circulated as received from the committee secretariat.
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Reference number
NATIONAL REGULATIONS.
ISO/DIS 12635:2020(E)
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PROVIDE SUPPORTING DOCUMENTATION. ISO 2020
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ISO/DIS 12635:2020(E)
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ii © ISO 2020 – All rights reserved
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ISO/DIS 12635:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Requirements .......................................................................................................................................................................................................... 2

4.1 Measurement conditions ......... ....................................................................................................................................................... 2

4.2 Plate dimensions ................................................................................................................................................................................... 2

4.3 Rectangularity ......................................................................................................................................................................................... 3

4.4 Edge waviness for CtP plates ...................................................................................................................................................... 3

4.5 Cutting burrs for CtP plates ......................................................................................................................................................... 3

4.6 Plate edge straightness for CtP plates ................................................................................................................................. 4

Annex A (informative) Test method for edge waviness ..................................................................................................................... 5

Annex B (informative) Test methods for the height of cutting burrs .................................................................................. 7

Annex C (informative) Test method for plate straightness ........................................................................................................... 9

Annex D (informative) Preferred plate sizes ............................................................................................................................................11

Bibliography .............................................................................................................................................................................................................................12

© ISO 2020 – All rights reserved iii
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ISO/DIS 12635:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 130, Graphic technology.

This third edition cancels and replaces the second edition (ISO 12635:2008), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— Preferred plate sizes are introduced

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
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ISO/DIS 12635:2020(E)
Introduction

This International Standard stipulates dimensional properties of printing plates for offset printing.

While not all present plate dimensions will conform to this International Standard, the specifications

for dimensions serve as an effort to reduce the multitude of possible formats to a reasonable level that

simplifies manufacture and communications between plate, platesetter and press manufacturers, and

the printer.

In this revision, preferred plate sizes are introduced. These represent the most widely used plate sizes

and should be selected where possible. It is recognised that for some printing work, other sizes will be

required.
© ISO 2020 – All rights reserved v
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DRAFT INTERNATIONAL STANDARD ISO/DIS 12635:2020(E)
Graphic technology — Plates for offset printing —
Dimensions
1 Scope

This International Standard specifies the width, length and thickness of metal lithographic printing

plates (referred to hereafter as “plates”). For plates to be used in computer to plate (CtP) applications,

flatness, edge straightness and burr requirements are also included. These requirements are applicable

to unprocessed plates.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
cutting burr

ridge along the edge of a plate produced by cutting, especially with a blunt knife

3.2
plate width
dimension of a printing plate parallel to the cylinder axis (clamping edge)
3.3
plate thickness
caliper of a coated plate
3.4
edge waviness
degree to which a plate edge conforms to a measurement plane
3.5
plate edge straightness

maximum deviation of the plate edge parallel to the cylinder axis (clamping edge) from a straight line,

drawn from the corners of the plate
3.6
preferred plate size
common plate sizes which should be used where possible
3.7
unprocessed plates
plates as received from the manufacturer
© ISO 2020 – All rights reserved 1
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ISO/DIS 12635:2020(E)
4 Requirements
4.1 Measurement conditions

Measurements shall be conducted when both measurement equipment and plates have reached a

stabilized temperature of 21 °C ± 1 °C.
4.2 Plate dimensions

When selecting plate width and height, preferred plate sizes as specified in Annex D should be used.

Where these plate sizes cannot be used, plates for sheet-fed lithographic use may be of any length, L,

or width, W, but shall be specified in increments of 5 mm where the last whole number digit is 0 or 5.

Plates for web lithographic use may be of any length or width but shall have their width specified in

increments of 5 mm where the last whole number digit is 0 or 5 and their length specified in increments

of 2 mm where the last whole number digit is 0, 2, 4, 6 or 8. These requirements are summarized in

Table 1.

Except where preferred plate sizes are being used, the tolerances for length and width shall be as shown

in Table 1, the measurement conditions of 4.1 shall apply.
The preferred thicknesses and their tolerances shall be as shown in Table 2.
Table 1 — Plate widths, lengths and their tolerances
Dimensions in millimetres
Process Width Width tolerance Length Length tolerance
W L
W < 1 500: ± 1,0 L < 1 500: ± 1,0
Sheet-fed offset Last digit 0 or 5 Last digit 0 or 5
W ≥ 1 500: ± 1,5 L ≥ 1 500: ± 1,5
W < 1 500: ± 0,8 L < 1 500: ± 0,8
Web offset Last digit 0 or 5
...