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GB/T 22921-2008 English PDF

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GB/T 22921-2008: Paper and board -- Determination of water vapour transmission rate of sheet materials -- Dynamic sweep and static gas methods
Status: Valid
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GB/T 22921-2008English209 Add to Cart 3 days [Need to translate] Paper and board -- Determination of water vapour transmission rate of sheet materials -- Dynamic sweep and static gas methods Valid GB/T 22921-2008

PDF similar to GB/T 22921-2008


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Basic data

Standard ID GB/T 22921-2008 (GB/T22921-2008)
Description (Translated English) Paper and board -- Determination of water vapour transmission rate of sheet materials -- Dynamic sweep and static gas methods
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard Y30
Classification of International Standard 85-010
Word Count Estimation 9,988
Date of Issue 2008-12-30
Date of Implementation 2009-09-01
Quoted Standard GB/T 450; GB/T 10739; ISO 2528-1195
Adopted Standard ISO 9932-1990, MOD
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard provides a common method for the determination of sheet materials flow method using dynamic or static water vapor permeability of the gas law. This standard applies to the determination of a thickness not exceeding 38mm, water vapor transmission rate at 0. 05g/(m2 �� d) ~ 65g/(m2 �� d) material within range.

GB/T 22921-2008: Paper and board -- Determination of water vapour transmission rate of sheet materials -- Dynamic sweep and static gas methods


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Paper and board. Determination of water vapour transmission rate of sheet materials. Dynamic sweep and static gas methods ICS 85-010 Y30 National Standards of People's Republic of China Paper and paperboard water vapor transmission rate of sheet materials Dynamic airflow and static gas method (ISO 9932.1990, MOD) Posted 2008-12-30 2009-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This revised standard adopts ISO 9932.1990 "Paper and paperboard water vapor transmission rate of sheet materials - Determination of dynamic and static airflow Gas Law. " This standard and ISO 9932.1990 as compared to the main differences are as follows. --- International Standard ISO document standard will be referenced in normative references converted to the corresponding national standard, GB/T 450 paper and cardboard to take samples and specimens to the vertical and horizontal, positive and negative determination (GB/T 450-2008, ISO 186.2002, MOD); --- International Standard ISO document standard will be referenced in normative references converted to the corresponding national standard, GB/T 10739 paper, paperboard and pulp sample processing and testing standard atmospheric conditions (GB/T 10739-2002, eqv ISO 187. 1990); --- Remove the ISO 9932.1990 in Appendix C. This standard Annex A, Annex B normative appendix. The standard proposed by China National Light Industry Council. The standard paper by the National Standardization Technical Committee (SAC/TC141) centralized. This standard was drafted. People's Bank of China Printed Science and Technology Institute, China Pulp and Paper Research Institute. The main drafters of this standard. Chen , Licai Qing, Tian Deqing, Ding Jie, Shen Tyurin. Paper and paperboard water vapor transmission rate of sheet materials Dynamic airflow and static gas method

1 Scope

This standard specifies the general method for the determination of sheet materials with dynamic or static gas airlaid method water vapor permeability. This standard applies to the determination of a thickness not exceeding 38mm, inner water vapor transmission rate at 0.05g/(m2 · d) ~ 65g/(m2 · d) range material.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 450 and take samples to an aspect of paper and paperboard samples, positive and negative determination (GB/T 450-2008, ISO 186. 2002, MOD) GB/T 10739 paper, paperboard and pulp sample processing and testing standard atmospheric conditions (GB/T 10739-2002, eqv ISO 187. 1990) ISO 2528.1995 water vapor transmission rate of sheet materials - Gravimetric (dish) method

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 Under certain conditions of temperature and humidity, water vapor mass per unit time through unit area of \u200b\u200bspecimen, in grams per square meter per day [g/(m2 · d)] FIG. 3.2 Low relative humidity chamber side measurement. 3.3 Test chamber relative humidity higher side. 4 Method A. Dynamic air flow method 4.1 Principle The sample was mounted in the measurement chamber, the sample measurement chamber cavity into wet and dry chamber. Among them, the relative humidity chamber known wet, dry dry purge chamber Dry gas stream (carrier gas). Sensors detect the carrier gas entrained amount of water vapor to give a reading. The readings or the readings calculated after conversion Value, that is, water vapor transmission rate of the sample. 4.2 Instrument 4.2.1 Determination of the chamber, the sample can be certain area is sandwiched between the two chambers, a dry purge gas chamber (dry chamber), while the other chamber is Victoria Holding high relative humidity (wet chamber) (see Fig. 1).

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