SIST ISO 5627:1996 PDF

Name: SIST ISO 5627:1996 — Paper and board -- Determination of smoothness (Bekk method)
SKU: SIST ISO 5627:1996
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Paper and board -- Determination of smoothness (Bekk method)

Название (английский):

SIST ISO 5627:1996

Paper and board -- Determination of smoothness (Bekk method)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 1 апреля 1996 г.
ICS:: 85.060
Технический комитет:: VPK - Pulp, paper, board and products

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Описание (английский):

Cancels and replaces the first edition (1984). Specifies a method of measuring the smoothness of paper and board, called the Bekk method. Especially recommended for smooth paper and boards. However for very smooth samples, measurement times may be impractically long. Not recommended for materials greater than 0,5 mm thick or very permeable papers and board, since the amount of air passing through the test piece can influence the result. Not recommended for newsprint and not suitable for rough papers and boards.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 5627:1995 - Paper and board: Determination of smoothness (Bekk method) defines the Bekk smoothness test, an air-flow based procedure to quantify the smoothness of paper and board surfaces. The standard replaces ISO 5627:1984 and is especially recommended for smooth papers and boards. It describes apparatus, sampling, conditioning, test procedure and reporting so laboratories and manufacturers can obtain comparable Bekk smoothness values.

Key topics and technical requirements

Test principle: a test piece is clamped against a polished glass plate and a partial vacuum draws atmospheric air through the surface gap; the time for a specified vacuum change is recorded - the greater the time, the smoother the sample.

Apparatus basics:

Polished glass plate with a contact area of 10 cm² (±0.05 cm²) and a central vacuum connection.
Pressure plate (≥45 mm diameter) and rubber pad (thickness ~4.0 mm ±0.2 mm; hardness 40 IRHD ±5).
Vacuum containers: large (≈380 ml) and small (≈38 ml) volumes; manometer accurate to ±0.07 kPa.
Timing device readable to the nearest second.

Operating conditions:

Apply a pressure of 100 kPa ±2 kPa to the test piece.
Create a vacuum of 50.7 kPa, then measure time for drop to 48.0 kPa (or to 29.3 kPa in low-time cases).
Use 10 test pieces per face (separate areas), conditioned per ISO 187.

Expression of results:

Arithmetic mean of 10 readings per face is reported as Bekk smoothness (in seconds).
When the small vacuum container is used, multiply the mean by 10; when the larger vacuum drop (50.7→29.3 kPa) is used, divide the time by 10 to obtain the Bekk value.

Limitations:

Not recommended for materials thicker than 0.5 mm, very permeable papers/boards, newsprint, or rough surfaces.
Extremely smooth samples may yield impractically long measurement times.

Applications and users

Primary users: paper and board manufacturers, quality control laboratories, independent testing labs, converters and printing companies that require quantitative surface-smoothness data for process control, product specification, and printability assessment.

Practical uses: incoming raw-material checks, production quality monitoring, comparative testing of coatings and calendering effects, and specifications for printing or finishing performance.

Related standards

ISO 187 - conditioning and atmosphere for testing

ISO 186 - sampling for average quality

ISO 48, ISO 4662 - referenced for rubber pad properties and resilience

Keywords: ISO 5627:1995, Bekk method, Bekk smoothness, paper smoothness test, smoothness of paper and board, air-flow smoothness test, paper quality control.

SIST ISO 5627:1996 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 5627:1995

Paper and board — Determination of smoothness (Bekk method)

ISO 5627:1984

Paper and board — Determination of smoothness (Bekk method)

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