ISO 14968:2022

Name: ISO 14968:2022 — Paper and board — Cut-size office paper — Measurement of curl in a pack of sheets
SKU: ISO 14968:2022
Price: 25 EUR
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Paper and board — Cut-size office paper — Measurement of curl in a pack of sheets

Название (английский):

ISO 14968:2022

Paper and board — Cut-size office paper — Measurement of curl in a pack of sheets

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 4 января 2022 г.
Издание:: ISO IS 14968 edition 2 version 1
ICS:: 85.060

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Описание (английский):

This document specifies a method for the measurement of curl in cut-size office papers. The test method is typically used in evaluating papers of the type described in ISO 216. This method is limited to papers with a maximum dimension of 300 mm in both directions. The measurement can be made on papers as received, after conditioning, or after processing in a copier or printing device.

Abstract

Overview

Key topics and requirements

Scope and sample size: Test packs consist of about 10–15 consecutive sheets; intended for uncoated cut-size office papers (60–150 g/m² range is typical).
Curl definition and units: Curl magnitude is expressed as the reciprocal of the radius of curvature (units: reciprocal metres, m⁻¹). Curl also includes axis direction and concave side.
Curl axis categories: Axis parallel to machine direction, perpendicular to machine direction, or diagonal (neither).
Apparatus - curl gauge: A gauge comprising a 210 mm straight line and companion arcs (each at least 210 mm long) with arc radii chosen so curl magnitude varies between about 1.00 m⁻¹ and 10.00 m⁻¹ (Annex B provides construction guidance).
Test atmosphere: Measurement can be done without standard conditioning (to capture as-removed or post-imaging curl) or in a standard atmosphere per ISO 187 when required.
Procedure highlights: Measure curl on up to four edges (recommended), suspend the pack and match the free edge against the gauge arcs, record curl magnitude, axis direction, concave side and any double-curl tendency.
Reporting and expression of results: If a dominant axis exists (parallel or perpendicular), report the mean of the two measured edges (m⁻¹); otherwise report all four edges. Test report must include sample identification, test atmosphere, imaging device details (if relevant) and all measured curl data.
Precision: Within-ream repeatability observed in test data ranged approximately ±0.25 m⁻¹ to ±0.375 m⁻¹; inter-laboratory reproducibility data were not available in the draft.

Applications and users

Quality control in paper mills and converting plants to monitor pack-level curl that affects downstream handling.
Paper specification and acceptance testing for procurement teams.
Reprographics and printer/copier manufacturers assessing how paper curl impacts feeding, jamming and duplex registration.
Independent test laboratories and R&D groups investigating post-processing curl from imaging devices.

Related standards

ISO 216 - Cut sizes (A and B series) and machine direction
ISO 187 - Standard atmosphere for conditioning and testing
ISO 186 - Sampling to determine average quality
ISO 11556 - Measurement of curl in individual sheets

Keywords: ISO 14968:2022, measurement of curl, cut-size office paper, curl gauge, curl magnitude, machine direction, test method, ISO 216, ISO 187, ISO 186, pack of sheets, copier, printing device.

Технические детали

Технический комитет: ISO/TC 6/SC 2 - Test methods and quality specifications for paper and board
SKU: ISO 14968:2022

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ISO 14968:2022

Abstract

Overview

Похожие стандарты

Key topics and requirements

Applications and users

Related standards

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