ISO 8791-4:2021 PDF

Name: ISO 8791-4:2021 — Paper and board — Determination of roughness/smoothness (air leak methods) — Part 4: Print-surf method
SKU: ISO 8791-4:2021
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Paper and board — Determination of roughness/smoothness (air leak methods) — Part 4: Print-surf method

Название (английский):

ISO 8791-4:2021

Paper and board — Determination of roughness/smoothness (air leak methods) — Part 4: Print-surf method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 17
Дата публикации:: 7 мая 2021 г.
Издание:: ISO IS 8791 edition 3 version 1
ICS:: 85.060

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Описание (английский):

This document specifies a method for determining the roughness of paper and board using an apparatus which conforms to the Print-surf method, as defined in this document. It is applicable to all printing papers and boards with which it is possible to form a substantially airtight seal against the guard lands of the measuring head.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 8791-4:2021 - Paper and board: Determination of roughness/smoothness (air leak methods) - Part 4: Print‑surf method specifies the standardized Print‑surf method for measuring the surface roughness of printing papers and boards. The method quantifies the mean air gap between a flat circular measuring land and the sheet surface by measuring air flow or pressure drop. It applies where a substantially airtight seal can be formed against the sensing‑head guard lands.

Key topics and technical requirements

Measurement principle: Air leak (Print‑surf) method - air flows across the measuring land; flow rate or pressure differential is converted to a roughness value expressed in micrometres.

Instrument types:

Variable‑area flowmeter: standard pressure (6.2 kPa or 19.6 kPa) across the measuring land; flowmeters calibrated to show the “cube root mean cube gap” (see Annex A).
Impedance type: controlled pressure source and fluidic impedance with pressure transducers; typically displays 0.6 µm to 6.0 µm to 0.1 µm resolution.

Sensing head geometry: three concentric annular lands - measuring land width 51.0 µm ± 1.5 µm, effective length 98.0 mm ± 0.5 mm; guard lands ≥ 1 000 µm; radial spacing between guard lands 152 µm ± 10 µm.

Clamping pressures: standard clamping pressures of 980 kPa ± 30 kPa and 1 960 kPa ± 30 kPa (instrumentation and protective‑collar spring force must be accounted for).

Backings: two resilient backings are specified:

Soft backing: offset blanket assembly, ≈2 000 µm thick, apparent hardness 83 IRHD ± 6.
Hard backing: polyester film assembly, apparent hardness 95 IRHD ± 2.

Sampling and test pieces: sample selection per ISO 186; conditioning per ISO 187; at least 10 test pieces per side, 100 mm × 100 mm each.

Calibration and maintenance: procedures and requirements for calibration (Annex C) and maintenance of testers (Annex B); precision data in Annex D.

Applications and users

Primary use: objective measurement of surface roughness/smoothness to assess printability, ink transfer, and runnability for printing papers and boards.

Who uses it:

Paper and board manufacturers - quality control and specification verification.
Printing houses and prepress labs - selecting substrates and optimizing press settings.
Test labs and standards organizations - accredited roughness testing and inter‑laboratory comparisons.
R&D teams - formulation, coating and surface treatment development.

Practical value: provides repeatable, instrument‑based roughness metrics that correlate with tactile properties and printing performance; useful for acceptance criteria, process control and supplier communication.

Related standards

ISO 186 - Sampling to determine average quality (referenced).

ISO 187 - Standard atmosphere for conditioning and testing (referenced).

Keywords: ISO 8791-4:2021, Print‑surf method, paper roughness, air leak methods, roughness measurement, paper smoothness, printing paper testing, paper and board standards.

ISO 8791-4:2021 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

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