GB/T 1541-2013 English PDF (GB/T1541-2013)

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GB/T 1541-2013: Paper and board -- Determination of dirt
GB/T 1541-2013
Paper and board - Determination of dirt
ICS 85.010
Y30
National Standards of People's Republic of China
Replace GB/T 1541-2007
Determination of dustiness of paper and cardboard
Released on.2013-10-10
2014-05-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Issued by the National Standardization Administration of China
Preface
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 1541-2007 "Determination of Dust Degree of Paper and Cardboard".
Compared with GB/T 1541-2007, the main changes of this standard are as follows.
--- The term "impurity" is changed to "dust", and the corresponding definition is also revised.
---Modified the description of the dust image in the text.
---The grouping in the result statement has been deleted, and the calculation formula expressed by the area of dust per square meter has been added.
---The dust picture and its description in Appendix A are revised.
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This standard was proposed by the China National Light Industry Council.
This standard is under the jurisdiction of the National Paper Industry Standardization Technical Committee (SAC/TC141).
The main drafting units of this standard. Hangzhou Shibaite Technology Co., Ltd., Hangzhou Entry-Exit Inspection and Quarantine Bureau, China Pulp and Paper Research Institute, China
Home Paper Quality Supervision and Inspection Center, Standardization Committee of China Paper Association.
Drafters of this standard. Li Ping, Gao Fengjuan, Zhang Lilong, Cui Kecong, Zhang Qing, Yu Liping, Wang Dong, Lu Xiaofen, Yin Qiao, Li Xin, Li Dafang.
The previous versions of the standard replaced by this standard are as follows.
---GB/T 1541-1964, GB/T 1541-1979, GB/T 1541-1989, GB/T 1541-2007.
Determination of dustiness of paper and cardboard
1 Scope
This standard specifies the method for measuring the dustiness of paper and paperboard.
This standard is applicable to the determination of dustiness of various papers and cardboards.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 450 Paper and cardboard sample collection and the determination of the longitudinal and transverse directions, front and back sides of the sample
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Dust
The fiber bundles and other impurities that are significantly different from the color of the paper can be seen on the paper at any angle of irradiation.
3.2
Dust
The number of dust with a certain area per square meter of paper and cardboard, or the equivalent area of dust per square meter of paper and cardboard
(mm2).
4 Instruments
4.1 Lighting device. 20W fluorescent lamp, the illumination angle should be 60°.
4.2 Rotatable sample plate. opal glass plate or translucent plastic plate, the area of the sample plate is 270mm×270mm.
4.3 Standard dust map. A series of dusts with different areas and shapes are printed on a transparent film, and the left half is arranged in the same horizontal row with the same area.
But the dust of different shapes; the right half is the same column arranged in the same area, but different shapes of dust, see Appendix A for details.
Note. The standard dust map is provided by the standardization agency. It is not recommended to use copies, because the copies may change the size of the spots.
5 sampling
Sampling in accordance with the provisions of GB/T 450, and cut out at least four samples of 250mm × 250mm.
6 Test procedure
6.1 Place a cut sample on a rotatable sample plate, press it with four-corner pliers on the plate, and inspect the paper surface under a fluorescent lamp.
Visible dust, the photopic distance during eye observation is 250mm~300mm, use different marks to circle different areas of dust, and use standard dust
The Angstrom comparison chart identifies the area of dust on the paper, and it can also be used to record the number of dust in the same area according to the size of different areas.
6.2 Rotate the sample plate 90°, and mark the newly discovered dust after each rotation until it returns to the original position.
Use the paper and cardboard, and then check the other side of the sample according to the above method.
6.3 Measure the remaining three samples according to the above steps.
7 Presentation of results
7.1 The result can be calculated according to the product standard or the grouping specified in the contract. First calculate the number of dust in each group on the front and back of each sample.
The paper and cardboard used on the two sides only measure the dust on the used surface, and the paper and cardboard used on both sides test the dust on both sides. The four samples are combined and calculated.
After converting it into the number of dust per square meter, the result is an integer.
The dust level is calculated according to formula (1) and expressed in units/m2.
ND=Mn ×16
(1)
Where.
ND --- Dust degree, in units per square meter (pieces/m2);
M --- the total number of dust in all samples;
n ---The number of samples for dust measurement.
Note 1.If the same dust penetrates the paper page and both sides can be seen, it is calculated as two dusts.
Note 2.If the dust is larger than 5.0mm2, or exceeds the maximum value specified in the product standard, or is black dust, take a 5m2 sample for measurement.
7.2 If the result is expressed in terms of the area of dust per square meter, the calculation is carried out according to formula (2), and the result is accurate to one decimal place.
SD=∑ax
·Bx
n ×16
(2)
Where.
SD --- dust area per square meter, in square millimeters per square meter (mm2/m2);
ax --- the number of dust in each group area;
bx --- the area of each group of dust, in square millimeters (mm2);
n ---The number of samples for dust measurement.
8 Test report
The sample report should include the following items.
a) Number of this standard;
b) Measurement results;
c) Any deviation from this standard.
Appendix A
(Normative appendix)
Standard dust map
The standard dust map is a transparent film (Figure A.1), which should be provided by the standardization agency. The film should not be used as a copy, because it reproduces
The product will change the spot size. The left half is arranged in the same horizontal row with dust of the same area but different shapes; the right half is arranged in the same column
Dust of the same area but different shapes.
Units are square millimeters