corrugated box suppliers

corrugated Suppliers

Each sample should be labeled and clearly and accurately marked and paper to positive and negative aspect. Water samples should be immediately sealed package. Samples need to maintain smooth, wrinkle does not fold, should avoid the direct rays of the sun to prevent humidity fluctuations and other harmful effects. Hands touching the sample should be careful to avoid chemical, physical, optical, and surface characteristics of the pattern. When sampling or testing, such as an unexpected result when the sample damage resampling, unless otherwise stated, the sample can be taken in the same package unit. In view of the temperature and humidity conditions have a significant impact on the physical properties of paper products, paper and performance testing of all board are required in accordance with national standards GB / T10739-2002 "standard atmospheric conditions for paper, board and pulp sample handling and testing," the regulations. Before the test pattern, should be placed on the temperature (23 ± 1) ℃, relative humidity (50 ± 2)% under ambient conditions of temperature and humidity treatment, the sample with a predetermined temperature, relative humidity reaches a moisture content of between atmospheric at equilibrium, the current weighing apart 1h after two or more, and the difference between the sample weighing not more than 0.25% by weight of the sample, it is considered to achieve a balance between the specimen and the atmospheric conditions. General Corrugating Medium Temperature and humidity treatment 4h? 6h to reach equilibrium. Since the equilibrium moisture test will lag serious error, therefore, for the samples collected from the wet weather, or humid storage environment, the need for sample pretreatment. Pretreatment methods is placing the sample temperature does not exceed 40 ℃, relative humidity 10%? 35% of pre-treatment under atmospheric conditions

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