GB/T 31479-2015 English PDF (GBT31479-2015)

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GB/T 31479-2015: Determination of colour fastness of dyed paper and board intended to come into contact with foodstuffs
GB/T 31479-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 85-010
Y 30
Determination of Colour Fastness of Dyed Paper and
Board Intended to Come into Contact with Foodstuffs
ISSUED ON. MAY 15, 2015
IMPLEMENTED ON. DECEMBER 1, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Principle ... 4
4 Materials and Apparatus ... 5
5 Reagents ... 5
6 Sampling ... 6
7 Specimen preparation ... 6
8 Test Methods ... 6
9 Assessment ... 7
10 Test Report ... 7
Appendix A (Normative) Composition and Preparation Method of Saliva
Simulant ... 9
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard was proposed by China Light Industry Council.
This Standard shall be under the jurisdiction of Technical Subcommittee of Paper
Products, National Technical Committee for Standardization of Materials and Products
Direct Contact with Foodstuffs (SAC/TC 397/SC 3).
Drafting organizations of this Standard. National Center of Quality Supervision and
Testing for Pulp and Paper Products, Putian Product Quality Inspection Institute, and
China National Pulp and Paper Research Institute.
Chief drafting staffs of this Standard. Guo Sheng, Huang Deyi, She Jifeng, Xu Jinxia,
Liang Xiangqun, Fu Xingxing, Peng pengjie, You Cong’e, Ye Yumin, and Cai Meiqiong.
Determination of Colour Fastness of Dyed Paper and
Board Intended to Come into Contact with Foodstuffs
1 Scope
This Standard specifies the two methods for determination of colour fastness of dyed
paper and board intended to come into contact with foodstuffs.
Method A in this Standard is applicable to the determination of colour fastness of dyed
paper and board (such as food packaging paper) intended to come into long-term
contact (contact time≥24h) with foodstuffs; while Method B is applicable to the
determination of colour fastness of dyed paper and board (such as napkins, and
kitchen paper) intended to come into short-term contact (contact time < 24h) with
foodstuffs.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 251 Textiles - Tests for Colour Fastness - Grey Scale for Assessing Staining
GB/T 450 Paper and Board - Sampling for Testing and Identification of Machine
and Cross Direction Wire Side and Felt Side
GB/T 461.1 Paper and Board - Determinatoin of Capillary Rise (Klemm Method)
3 Principle
Contact the specimen and tested solution with the glass fiber paper completely
immersed for 10 min; place them for a certain period under certain pressure; compare
the stained glass fiber paper (test sample) with the blank sample, and use the gray
scale to assess the grade. Select the test solution as per the paper usage; the test
solution contains distilled water or deionizer water, dilute acetic acid, saliva simulant,
isooctane or olive oi.
NOTE. in this Standard, the specimen indicates the tested dyed paper or board. Blank sample