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GB/T 24290-2009Measurement of paper machine forming wire and dryer (English PDF)

造纸用成形网、干燥网测量方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 31, 2009

Implementation date

March 1, 2010

Scope

GB/T 24290-2009 is the English-translated version of 造纸用成形网、干燥网测量方法.

GB/T 24290-2009 is the Chinese standard "Measurement of paper machine forming wire and dryer".

Its scope clause reads: This standard specifies the paper multilayer forming fabrics, warp (weft) density of the drying wire, tensile strength, elongation anyone, ventilation volume, freeness, thick Degrees, dehydration index (DI) and fiber support index (FSI) measurement and calculation methods.

This standard applies to papermaking forming fabric and drying nets. 2 calculated by (weft) Determination of density and open porosity.

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Document preview — GB/T 24290-2009

National Standard of the People's Republic of China

ICS: 85.010
Classification: Y 30

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and definitions

1 Scope

This standard specifies the paper multilayer forming fabrics, warp (weft) density of the drying wire, tensile strength, elongation anyone, ventilation volume, freeness, thick

Degrees, dehydration index (DI) and fiber support index (FSI) measurement and calculation methods.

This standard applies to papermaking forming fabric and drying nets.

2 calculated by (weft) Determination of density and open porosity

2.1 Instrument

The (weft) densitometer, measuring range 50mm, division 1mm.

2.2 Test procedure

take a piece of mesh-like, the first identification Jingwei direction, adjust the scale to 0 by the (weft) densitometer pressed on the network like the marking of

A quasi-center position of a warp (weft) lines. Rotating screws, which move marking the aid of a magnifying glass visual marking a countable net of 50mm

The number of faces contained in the warp (weft) line, and then divided by 5, that is, after (weft) density, root/cm representation.

2.3

aperture ratio according to equation (1).

100% (1)

Where.

A --- opening ratio,%;

Calculation results are accurate to 0.1%.

2.4

mesh size according to equation (2).

Adelta =

Where.

Calculation results are accurate to 0.001mm.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Cited by

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