The National Entry-Exit Inspection and Quarantine Bureau serves as the official authority in charge of inspecting and controlling imported and exported goods within China's foreign trade system. This includes overseeing the quality of export cartons, ensuring they meet necessary requirements for international shipment. The bureau has its own set of inspection and quarantine standards, which are specifically tailored for export cartons. These standards differ from general national standards, as the latter cover a broader range of common testing methods and technical specifications for packaging materials across various industries. In contrast, the inspection and quarantine standards are more detailed and focused on the specific needs of export cartons, making it essential for manufacturers to fully understand them.
As the use of cartons continues to expand globally, the importance of testing their properties has grown significantly. Testing of paper products and cartons typically involves several key standards:
1. **GB 6543-2008** is the national standard for corrugated boxes, primarily focusing on tests such as box compression strength and stacking strength. These tests ensure that cartons can withstand the pressures of transportation and storage.
2. **GB/T 13024-2003** outlines the main testing parameters for boxboard, including weight, thickness, tightness, burst resistance, transverse ring pressure, transverse fold resistance, water absorption, and moisture content. These factors directly affect the durability and performance of the material.
3. **GB/T 6544-2008** specifies tests for corrugated cardboard, covering thickness, edge compressive strength, adhesion strength, burst strength, puncture resistance, and moisture content. These tests help determine the structural integrity of the cardboard.
4. **GB/T 13023-2008** focuses on the properties of corrugated base paper, including weight, tightness, transverse ring compressive strength, longitudinal cracking length, and moisture. It ensures the base material meets required quality levels.
5. **GB/T 451.2-2002**, titled "Determination of Quantification of Paper and Paperboard," provides guidelines for measuring the weight of paper per unit area, commonly referred to as "grammage." This is a fundamental property used to characterize paper quality. Grammage is defined as the mass of a unit area of paper or cardboard, measured in grams per square meter (g/m²). Accurate measurement of grammage depends on both the precision of the test sample’s area and the accuracy of the weighing equipment. It is recommended to use a circular punch-type quantitative sampler combined with a balance accurate to 0.01 grams for reliable results.
Understanding these standards is crucial for manufacturers aiming to meet international market demands and ensure product quality and compliance.
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