In recent years, the profit-making trend of the carton industry has gradually emerged. Some people even claim that the carton factory is like a porter, that is, the price for buying raw materials is almost the price for selling finished products. As the saying goes, "It's better to sell than to buy," which means that you can buy quality and cheap raw materials and even contribute more than you can sell more products. Therefore, the purchase cost control is getting more and more attention for everyone.
Paper is the most important consumable in carton products. The cost of paper is the key to controlling the cost of the carton. The purchase of paper is mainly influenced by many factors such as paper price and paper properties. The price is determined by the market environment. Only the performance of paper can be judged based on actual experience. We must understand the paper performance, under the premise of actual operation experience to judge the paper trend, and then paper procurement.
Corrugated cartons are made from corrugated cardboard, and corrugated cardboard is made from adhesives made from paper and corrugated paper. Therefore, the base paper can be said to be the most important consumable in the purchase of corrugated boxes. Here are some basic knowledge about base paper.
The nature of the base paper
â–²Basis (BASIS WEIGHT)
The weight per unit area of ​​paper is called quantitative. The allowable difference between the surface paper and the corrugating medium is 5%. The various properties of the base paper are closely related to the basis weight. Exceeding this standard can affect the quality of the product.
Quantitative test according to the national standard GB 451.2 paper and duty quantitative test method specified sample should be hung in the specified temperature (20 ± 2 °C) and relative humidity (65 ± 2%) of the air, so that the surface can be fully exposed to the modulation The air has a modulation time of 24 hours and is weighed using a balance with a sensitivity of 0.25%. The basis weight of the paper is calculated according to the following equation and expressed as 3 digits.
If it cannot be measured at the specified temperature and relative humidity, it can be calculated according to the following steps:
Step 1: Weigh the sample using a standard balance
The second step: Determination of moisture content of paper samples according to GB 462 paper and paperboard moisture determination
The third step: Calculate the weight of the sample by calculating the weight at a water content of 9% according to the following formula.
â–²Thickness (THICKNESS or CALIPER)
The thickness of the paper indicates that the metric system is in mm (in mm, the inch system is in inches, and the English and the US are usually in mil for corrugated medium paper, each point is equal to 0.001 inch, for example, commonly used The corrugated paper thickness of 26b/MSF2 is 0.009 inches, commonly known as "9-point" paper.
From the thickness of the base paper plus the height of the corrugated board, the thickness of the corrugated board can be obtained, so that the degree of corrugating ROLL wear and the degree of damage to the strength of the corrugated board during processing can be clearly understood.
(to be continued)
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