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FZ/T 50010.4-2011 (FZ/T50010.4-2011)

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Standards related to: FZ/T 50010.4-2011

FZ/T 50010.4-2011: PDF in English (FZT 50010.4-2011)

FZ/T 50010.4-2011
ICS 59.060.20
W 50
Replacing FZ/T 50010.4-1998
Pulp board for viscose fiber - Determination of alpha
cellulose content
ISSUED ON: MAY 18, 2011
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Principles ... 6 
5 Reagents and materials ... 6 
6 Instruments ... 6 
7 General test rules ... 7 
8 Test procedures ... 7 
9 Result calculation ... 7 
10 Test report ... 8 
Pulp board for viscose fiber - Determination of alpha
cellulose content
1 Scope
This standard specifies the method for the determination of the alpha cellulose content
of viscose fiber pulp.
This standard applies to all kinds of viscose fiber pulp, including cotton pulp, wood
pulp, bamboo pulp, hemp pulp, etc.
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) is
applicable to this standard.
GB/T 3291.1 Textiles - Terms of textile material properties and test - Part 1: Fiber
and yarn
GB/T 3291.3 Textiles - Terms of textile material properties and test - Part 3: General
GB/T 4146.1 Textile - Man-made fibers - Part 1: Generic name
GB/T 8170 Rules of rounding off for numerical values & expression and judgement
of limiting values
FZ/T 50010.1 Pulp board for viscose fiber - Sampling method
FZ/T 50010.2 Pulp board for viscose fiber - Determination of moisture content
3 Terms and definitions
The terms and definitions, as defined in GB/T 3291.1, GB/T 3291.3, GB/T 4146.1, as
well as the following terms and definitions, apply to this document.
The cellulose part, which has a higher degree of polymerization AND cannot be
7 General test rules
7.1 Sampling
Carry out sampling, in accordance with the provisions of FZ/T 50010.1.
7.2 Test environment
Temperature (20 ± 2) ℃.
8 Test procedures
Weigh about 2 g (accurate to 0.0001 g) of each specimen, that has been conditioned and
balanced. Put it into a 100 mL beaker. At the same time, weigh two sets of specimens,
to measure and analyze the moisture, according to the provisions of FZ/T 50010.2. Add
about 15 mL of 17.50% sodium hydroxide solution, at (20 ± 1) ℃. Use a flat-headed
glass rod, to stir it carefully, for 30 circles for about 30 s, to make the specimen into a
uniform paste. Then add about 15 mL of the above solution. Carefully stir it for 10
circles, for about 10 s. Vigorous stirring shall be avoided. Cover the surface glass dish.
Put it into a constant temperature water bath at (20 ± 1) ℃, for mercerizing treatment
for 45 min (from the first addition of lye). Then add 30 mL of (20 ± 1) ℃ distilled water,
into the beaker. Stir carefully for 12 circles, for about 12 s. Turn on the vacuum pump,
to let it slowly suck and filter. Then move the slurry in the beaker, into the sand core
crucible, which has reached constant weight. Spread it evenly. Under weak vacuum
filtration, use 75mL of 9.50% sodium hydroxide solution, at (20 ± 1) ℃, to rinse it three
times (25 mL each time). In each rinsing, when the previous washing solution is
completely filtered out, add a new washing solution AND turn the sample over and
wash it, to spread it evenly. The total washing time is 2 min ~ 3 min. When all the
washing liquid is filtered out, use (20 ± 1) ℃ distilled water to rinse it several times,
until the detection shows a neutral reaction. After rinsing, continue to filter the water,
until there is no water drip at the lower end of the filter, when the specimen is tightly
pressed by a flat-headed glass rod.
Remove the sand core crucible. Use distilled water to rinse the outside. Put it into an
oven at (105 ± 3) ℃, to dry it to constant weight. The increased mass of the sand core
crucible is the mass of α-cellulose. When the difference, between two consecutive
weighings is not greater than 0.1% of the original specimen mass, it can be considered
that the constant weight has been reached.
9 Result calculation
The content, of α-cellulose in pulp for viscose fiber, is calculated according to formula
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.