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Pulp, paper and pulp processing and testing of the standard sample the atmosphere
GB/T10739-1989 The standard equivalent to using ISO187 < Pulp , Paper and Cardboard Sample temperature and humidity treatment
1 subject matter and scope This standard specifies Pulp , Paper and board processing and test temperature and humidity before the test standard atmosphere.
This standard applies to all pulp, paper and board samples, but not for paper and cardboard containers and processed Paper Packaging Material.
2 terms 2.1 Relative Humidity
At the same temperature and atmospheric pressure, atmospheric water vapor content of the actual water vapor content of saturated atmosphere percentage. Temperature and humidity treatment
2.2 To the provisions of the sample and the temperature, relative humidity of the atmosphere to achieve a balance between the moisture content of the course. More than 1h after the current gap between the results of two sample weighing not more than the amount provided for, they think a balance has been achieved, the situation is not within the scope of this method.
3 standard atmosphere Test pulp, paper and cardboard with the standard relative humidity of the atmosphere should be (50 +2)% and temperature 23 +. But limited to the current country conditions, temporary conditions of the original standard atmospheric relative humidity (65 +2)%, temperature maintained to the end of 1993, as an interim.
Standard atmospheric conditions change should meet the following requirements of the short-term changes in relative humidity.
Relative humidity is allowed to deviate from +4%.
Deviate from the time no more than every 15min in 1min.
4 experimental control of the atmosphere
Control equipment should be functioning well, to ensure that the indoor air circulating evenly. The rate of air should be sufficient flow in the indoor, air about once every 5min completely changed. All cooling, heating, humidification, cooling should be carried out in the outdoor temperature and humidity from the room or air duct controls the exit of the sensing element. Flow must be uniform from the top of the porous enter, withdraw from the floor, so that the room temperature was precisely controlled at a small level of fluctuation. According to Appendix A (Supplement), in a certain interval of time measured indoor temperature and relative humidity, and make detailed records, according to records to measure the stability of laboratory conditions, the use of wet and dry bulb thermometer should be able to read standard.
5.1 Sample pretreatment Order to avoid Paper Lag error caused by testing the water balance, temperature and humidity treatment in the pretreatment of samples before, about the sample on the temperature lower than 40, less than 35% relative humidity environment, such as sulfuric acid density (20) is greater than 1.3951 sulfuric acid desiccator, pretreatment 24h. If the moisture content of samples is low, subject to moisture balance, it can save pretreatment. Temperature and humidity treatment
5.2 Will cut hung up sample to constant temperature and humidity of the air free access to the samples in each hand, until the water balance. General paper handling 4h enough, thin cardboard at least 5-8h, high quantitative or other kinds of paper to 48h or longer.
Appendix A measurement of relative humidity (Supplement)
A1 measured by ventilated wet and dry bulb thermometer. Thermometer indexing value 0.2C °, the ventilation velocity was 4 ± 1mm / s.
A2 wet bulb thermometer hygrometer in the application of the mercury ball wrapped gauze to keep the cloth clean and should be changed regularly to maintain the saturation of water injection.
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