Introduction to the performance testing standard o

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Introduction to China's carton performance testing standards

if the base paper used by China's carton manufacturing enterprises is divided according to the origin, it can be simply divided into imported base paper and domestic base paper; According to the variety of base paper, it can be divided into kraft paperboard (also known as Kraft linerboard in China), corrugated base paper, as well as whiteboard for higher-grade packaging and printing, coated kraft paper, coated kraft paperboard, etc. Due to the rapid development of China's carton industry, the demand for base paper is increasing year by year, especially coated kraft board. Because it not only has the advantages of kraft board and coated white board, but also has the strength of kraft board and the printability of white board, the import volume has increased significantly

although the overall quality of domestic base paper has been greatly improved in recent years, compared with the quality of foreign base paper, there is still a gap in the durability and wear resistance of this kind of decorative board. Even if individual paper mills can reach the same level abroad, they can not meet the demand in the production of some low gram weight, high-strength kraft paper and corrugated paper due to limited production capacity. Most still rely on imports. For imported base paper, China's inspection and quarantine department has specific provisions: according to the provisions of the commodity inspection law, the commodities listed in the category list must be inspected by the inspection and quarantine institution or its designated inspection department, and shall not be sold and used without inspection. Most of the carton base paper imported from China is legally inspected goods, so it must be inspected. At present, the inspection standards followed by the inspection and quarantine department when inspecting these papers are roughly the following:

1. Mandatory standards of laws and regulations or other inspection standards that must be implemented

2. If there are no mandatory standards or other inspection standards that must be implemented in laws and regulations, the inspection can be carried out according to the standards agreed in the contract between the two parties. (if the mandatory standards of laws and regulations are lower than the standards agreed in the contract, the standards agreed in the contract shall prevail)

3. Neither of the above two points can be inspected according to the standards of the producing country, relevant international standards or the standards designated by the national inspection and quarantine authority. If there is no suitable testing standard, the approved internal method standard shall be selected

here we need to make a special explanation for the above point 2. In our actual inspection process, we found that most domestic users do not have enough agreement on the quality terms of imported base paper in the trade contract, or even no agreement. They often only recognize the brand and origin, and ignore the quality fluctuation of the product itself. In the first half of this year, our inspection and quarantine department inspected and found that there were several batches of imported paper with quality problems. However, what the customer didn't show in the contract was an illusion. The quality requirements and inspection standards for receiving goods were agreed in advance, which made it difficult for the inspection and quarantine department to issue the certificate of non conformity, and brought trouble to the customer that there were two chuck households on the installation to claim for compensation and return. Therefore, We call on enterprises importing base paper to stipulate quality terms in the contract to protect their own income

the specific inspection contents of paper include: safety, health, environmental protection, quality, quantity, weight, packaging and other items. Due to space constraints, we will only introduce the conventional physical testing items and the methods and standards used

1. Appearance inspection: the appearance inspection of paper is one of the important inspection items, which is generally composed of on-site sampling inspection and laboratory inspection. The appearance defects of paper not only affect the appearance of paper, but also affect the use of paper. The inspection methods we adopt, such as setting fire separation belts, are: ISO, TAPPI standards, sn/t and national standard gb/t1541 dust detection, etc. It mainly adopts light exposure test, head up test, squint test and hand touch test. The paper surface shall be flat and clean, and no folding is allowed

2. Physical property inspection: before carrying out physical property inspection, the paper must be pretreated with constant temperature and humidity according to the standards. Because different papers need different test items, here are mainly several:

(1) good white board paper generally requires tight texture, smooth surface, consistent thickness, non fuzzing, good absorption and small expansion rate, And can adapt to the requirements of multicolor overprint

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