Position:The experiment uses the knife that cut paper or special check sample implement, the area that checks a sample and formulary area photograph are compared, the deviation range that in asking 100 times every, has 95 times at least is in 1% less than. With the method of 4.3.1 often school nucleus equipment. If already achieved precision, the average area consideration that in be being used in school nuclear test, receives is mensurable.
4.2 balance
Sample weighs 5g to use precision 0.001g scale below;
Of above of sample heavy 5g with precision 0.01g balance;
Of above of sample heavy 50g with precision 0.1g balance or quadrantal balance.
Uses scale or quadrantal balance are pressed only 4.3.2 undertake school nucleus.
Air current semmetry should prevent to weigh the influence of device when saying to weigh.
4.3 instruments calibration
The school of the 4.3.1 equipment that cut pattern nucleus
Cut tangent plane accumulating into parts to answer often school nucleus, cut 20 sample, calculate their area should be achieved 4.1 in demonstrative precision, be less than average area when the standard deviation of each areas 0.5% when, this average area can be used on the mensurable computation that experiments later, if standard deviation exceeds this range, the area of every sample should determine individually.
The school of 4.3.2 balance nucleus
Balance should undertake metage via weight used on a balance of commonly used and exact level, try school nucleus, listed and corrective watch. Classics Weights and Measures Bureau can be used of school nucleus inside effective calibrating cycle.
5 sampling
Of the choice of paper and unit of measurement and sample adopt, answer to undertake by GB/T450 method, the amount of sampling should not less than 5, their gross area should at least enough 20 sample.
6 wet process
Sample should have lukewarm wet process by the requirement of GB/T10739.
If be in,determine below other lukewarm wet condition, report result should explain sample is weighing the condition when weighing.
7 sample measure
7.1 edges paper fore-and-aft fold becomes 1, 5 layer or 10, next the edge is transverse and even cut take 0.01 namely the sample of 100mm100mm at least 4 fold, accuracy is 0.1mm, if determine at the same time banner ration deviation, should take more as far as possible some. If be necessary to also can be cut,take 0.05 namely the sample of 200mm250mm, accuracy is 0.5mm. Say to take every to fold the quality of sample respectively, go up from pattern of 5 pieces of paper at least by above measure, cut in all 20 fold sample.
If cut appearance equipment to cannot satisfy precision requirement, should determine the dimension of each sample, computation goes out measure an area.
7.2 width should press drum in dish of paper under 100mm completely wide cut the scrip that takes 5 long 300mm, along with all the others metage, should gauge the long side of place metage scrip and short margin, accurate it is 0.5mm to long side, short edge is 0.1mm, calculate next area. The vernier calipers that can use precision to be 0.02mm is measured.
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