ISO 12635:2021 Graphic technology — Plates for offset printing — Dimensions
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Graphic technology — Plates for offset printing — Dimensions是于2021-06-09发布的ISO标准，适用于全球范围。标准截图
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INTERNATIONAL STANDARD ISO 12635:2021
Graphic technology — Plates for offset printing — Dimensions
1 Scope
This document 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 a nd definiti ons
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
cutting burr
ridge along the edge of a plate produced by cutting, especially with a blunt knife
3.2
plate width
W dimension of a printing plate parallel to the cylinder axis (clamping edge)
3.3
plate thickness
s 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
unprocessed plates
plates as received from the manufacturer
ISO 12635:2021
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
Commonly used plate widths and heights identified by plate and press manufacturers are specified in Annex D. When selecting plate width and height, these preferred plate sizes 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 multiples 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 multiples of 5 mm where the last whole number digit is 0 or 5 and their length specified in multiples 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 litho-
Last digit 0 or 5 Last digit 0 or 5
graphic offset
W ≥ 1 500: ±1,5 L ≥ 1 500: ±1,5
W < 1 500: ±0,8 L < 1 500: ±0,8
Web lithographic Last digit 0 or 5 Last digit 0, 2, 4, 6, or 8
offset
W ≥ 1 500: ±1,5 L ≥ 1 500: ±1,5
NOTE Except where otherwise specified by the plate manufacturer, plates for web offset printing have the machine direction parallel to the length.
Table 2 — Plate thickness
Dimensions in millimetres
Preferred thickness Tolerance
0,100
0,120
0,145
0,190 ±0,010
a
0,230
b
0,270
c
0,280
0,375
±0,015
0,480
a
Plates of this thickness are commonly referred to as “class 0,24 mm plates” in Japan.
b
Plates of this thickness are commonly used in China.
c
Plates of this thickness are commonly referred to as “class 0,3 mm plates”.
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