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GB/T 22899.1-2008: Paper and board -- Measurement of hygro-expansivity -- Part 1: Hygro-expansivity up to a maximum relative humidity of 68%
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 22899.1-2008 | English | 189 |
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Paper and board -- Measurement of hygro-expansivity -- Part 1: Hygro-expansivity up to a maximum relative humidity of 68%
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GB/T 22899.1-2008
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Basic data | Standard ID | GB/T 22899.1-2008 (GB/T22899.1-2008) | | Description (Translated English) | Paper and board -- Measurement of hygro-expansivity -- Part 1: Hygro-expansivity up to a maximum relative humidity of 68% | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y30 | | Classification of International Standard | 85-010 | | Word Count Estimation | 8,895 | | Date of Issue | 2008-12-30 | | Date of Implementation | 2009-09-01 | | Quoted Standard | GB/T 450; GB/T 451.2; GB/T 10739 | | Adopted Standard | ISO 8226-1-1994, MOD | | Regulation (derived from) | National Standard Approval Announcement 2008 No.25 (Total No.138) | | 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 specifies a method from the relative humidity (33 �� 2) under % ~ (66 �� 2)% equilibrium moisture measurement of paper and paperboard in expansion. This section applies to a general paper and paperboard, not for crepe paper and corrugated board. | GB/T 22899.1-2008: Paper and board -- Measurement of hygro-expansivity -- Part 1: Hygro-expansivity up to a maximum relative humidity of 68%
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. Paper and board Measurement of hygroexpansivity Part 1. Hygroexpansivity up to a maximum relative humidity of 68%
ICS 85-010
Y30
National Standards of People's Republic of China
Paper and cardboard wet expansion coefficient
Part 1. The maximum relative humidity is increased
Wet expansion process of 68%
(ISO 8226-1.1994, 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
GB/T 22899 "Paper and board Determination of wet expansion" is divided into two parts.
--- Part 1. Maximum relative humidity 68% expansion to wet process;
--- Part 2. Maximum relative humidity 86% to wet expansion process.
This is Part 1 GB/T 22899 of.
The partial modification of the use of ISO 8226-1.1994 "Paper and cardboard wet expansion coefficient - Part 1. The maximum relative humidity is increased
Wet process 68% overrun. "
This part of ISO 8226-1.1994 as compared to the main differences are as follows.
--- International Standard ISO document standard will be referenced in the normative references converted to its 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 the normative references converted to its corresponding national standard, GB/T 451.2
Paper and cardboard quantitative determination (GB/T 451.2-2002, eqv ISO 536.1995);
--- International Standard ISO document standard will be referenced in the normative references converted to its 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).
This section of Appendix A normative appendix.
This part is proposed by the China National Light Industry Council.
This part of the National Standardization Technical Committee under the jurisdiction of the paper industry.
This section drafted by. China Pulp and Paper Research Institute, the national paper quality supervision and inspection center, China Paper Association Professional Committee of Standardization
Members will.
The main drafters of this section. Bao-Rong Lu.
Paper and cardboard wet expansion coefficient
Part 1. The maximum relative humidity is increased
Wet expansion process of 68%
1 Scope
This section GB/T 22899 specifies the method of determining the relative humidity of paper and cardboard from (33 ± 2)% ~ under (66 ± 2)% balance
Methods of moisture expansion.
This section applies to ordinary paper and paperboard, not for crepe paper and corrugated cardboard.
2 Normative references
The following documents contain provisions which, through reference GB/T 22899 in this section constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
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 451.2 Paper and paperboard quantitative determination (GB/T 451.2-2002, eqv ISO 536.1995)
GB/T 10739 paper, paperboard and pulp sample processing and testing standard atmospheric conditions (GB/T 10739-2002, eqv ISO 187.
1990)
3 Terms and Definitions
The following terms and definitions apply to this part of the GB/T 22899 of.
3.1
Known length of paper or paperboard, balance and relative humidity from a lower value to a predetermined higher value during a predetermined length of its occurrence
The change.
Length change can be expressed as a percentage of the length of the paper or paperboard at a relative humidity of 50% measured at equilibrium conditions.
Note. The sample is considered contraction absorbent expansion is negative.
Principle 4
To ensure that all samples were tested from a humidity level similar to the initial relative humidity, this section contains a pre at low relative humidity
Processing step.
At (23 ± 1) ℃, 0 load and (22 ± 3)% relative humidity, temperature and humidity conditions of the sample pre-treatment. Then (33 ± 2)% and
Under (66 ± 2)% relative humidity, the sample to be appropriate load and quantitative changes in length of the specimen was measured. It may represent a change in length
As a percentage of 50% of the measured length relative humidity.
5 Apparatus and materials
5.1 cabinet
With air circulation, capable of maintaining GB/T 10739 stipulated (23 ± 1) ℃, within 30min can achieve the required uniform
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