GB/T 31905-2015 English PDF (GBT31905-2015)

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GB/T 31905-2015: Paper and board -- Determination of edge permeance
GB/T 31905-2015
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 85-010
Y 30
Paper and board - Determination of edge permeance
ISSUED ON: SEPTEMBER 11, 2015
IMPLEMENTED ON: APRIL 1, 2016
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Principle ... 5
5 Test equipment ... 5
6 Sample taking and processing ... 6
7 Test steps ... 6
8 Result calculation ... 9
9 Test report ... 9
Paper and board - Determination of edge permeance
1 Scope
This standard specifies the method for determining the edge permeance (edge
permeance mass and edge permeance distance) of paper and board.
This standard applies to various paper and boards used for processing paper products
for packaging and containing liquids.
2 Normative references
The following documents are essential for the application of this document. For
referenced documents with dates, only the versions corresponding to the dates are
applicable to this document; for referenced documents without dates, the latest versions
(including all amendments) are applicable to this document.
GB/T 450 Paper and board - Sampling for testing and identification of machine and
cross direction, wire side and felt side
GB/T 451.3 Paper and board - Determination of thickness
GB/T 461.1 Paper and board - Determination of capillary rise - Klemm methods
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 10739 Paper, board and pulps - Standard atmosphere for conditioning and
testing
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 edge permeance
It characterizes the degree of liquid permeating through the cross-section of paper or
board.
3.2 edge permeance mass
Under specified conditions, the mass of liquid that permeates into the paper or board
per unit cross-sectional area.
3.3 edge permeance distance
The maximum distance a liquid can permeate into a cross-section of paper or board
under specified conditions.
4 Principle
4.1 Edge permeance mass
The front and back of the sample are stuck with tapes; it is cut into a test piece of
specified size; the test piece is put into the soaking solution for a certain period of time,
then taken out, and the excess liquid on the surface is removed with absorbent paper.
The masses of the test piece before and after immersion are weighed, and the difference
between the mass of the test piece before and after immersion is divided by the cross-
sectional area of the test piece to obtain the edge permeance mass.
4.2 Edge permeance distance
The front, back and cross-section of the sample are stuck with tapes; it is cut into a test
piece of specified size; the test piece is put into the soaking solution for a certain period
of time, then taken out, and the excess liquid on the surface is removed with absorbent
paper. The maximum distance that the liquid permeates into the sample is measured,
that is, the edge permeance distance.
5 Test equipment
5.1 Tape
The tape shall be waterproof and non-absorbent, with a width greater than 30 mm. The
tape used for edge permeance distance determination shall be transparent.
5.2 Metal roller
The metal roller has a width of (200.0±0.5) mm, a diameter of (86.5±0.5) mm, a mass
of (10.0±0.5) kg, and a smooth surface.
5.3 Balance
The graduation value is 0.001 g.
5.4 Soaking solution
The tertiary water for analytical laboratories, which meets the requirements of GB/T
6682.
5.5 Containers
Stainless steel or glass containers for the soaking solution.
5.6 Grid
A metal grid with brackets or hooks used to hold down the test piece to maintain the
depth of the test piece immersed in the soaking solution.
5.7 Constant temperature water bath device
It is used to maintain the temperature of the soaking solution; the temperature can be
controlled at (95.0±2.0) ℃.
5.8 Stopwatch
The reading accuracy is up to 1 s.
5.9 Absorbent paper
The quantitative value is 200 g/m2~250 g/m2, and its longitudinal and transverse
capillary rises measured according to GB/T461.1 shall be no less than 75 mm/10 min.
When the quantitative value of a single layer of absorbent paper is less than 200 g/m2,
multiple layers can be stacked to meet the above requirements. As long as the
absorbency of absorbent paper can be guaranteed, it can be reused.
5.10 Steel ruler
The graduation value is 1 mm.
6 Sample taking and processing
Sample taking and processing shall be carried out according to GB/T 450 and GB/T
10739.
7 Test steps
7.1 Determination of edge permeance mass
7.1.1 Cut a specimen of 100 mm×100 mm in size and mark the longitudinal and
transverse directions of the specimen.
7.1.2 Determine the thickness T of the specimen according to GB/T 451.3.
7.1.3 Stick the tape (5.1) on the front and back of the specimen and press it flat with a
metal roller (5.2).