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Synthetic fiber (synthetics) is a kind of chemical fiber, which is a general term for chemical fibers made from synthetic polymer compounds. It uses small molecular organic compounds as raw materials, and is a linear organic polymer compound synthesized by polyaddition reaction or polycondensation reaction, such as polyacrylonitrile, polyester, polyamide, etc. It can be seen from the classification of fibers that it belongs to a category of chemical fibers.

International special line logistics and international express delivery are common cross-border mail packages for cross-border e-commerce sellers

International express delivery refers to the express logistics business conducted between two or more countries (or regions). Similar to domestic express companies and international express companies、 the main service and timeliness can achieve door-to-door transportation、 customs clearance is fast and efficient、 but the price cost is also relatively high. It is generally applicable to personal mailing of emergency goods、 or cross-border sellers sending goods with high value、 and the cost performance ratio is not high.

Special line express is mainly used to connect cross-border logistics companies with special lines from one country to another、 centralize goods for directional transportation、 and reduce costs through scale effect. Therefore、 the cost performance of international cross-border special lines is much higher than that of international express.

In addition、 cross-border logistics companies that can form a stable transportation scale will not be much slower than international express delivery in terms of efficiency. For example、 I found that the well-known Todropshipping and Daiyou Bao special lines in China take 5-8 working days to reach the United States、 while the reference efficiency of UPS is 4-7 working days、 with a small difference. Therefore、 the cross-border special line logistics has a high cost performance ratio and is suitable for small and medium-sized cross-border sellers to send packages internationally.

The cost of air transportation mainly includes freight and miscellaneous charges. The unit price of freight is calculated according to the weight grade. Generally、 there are several grades:

+45kg

+100kg

(Goods above 100kg)+300kg、+500kg、+1000kg

Generally、 if there is no corresponding level of freight rate、 the freight of goods is calculated according to the tact price. The billing weight of goods is also important. The weight of goods is divided into volume weight and gross weight in air transportation. When the volume weight is greater than the gross weight、 the volume weight is the billing weight of the goods. When the volume weight is less than the gross weight、 the actual gross weight is the billing weight.

Miscellaneous charges include many aspects、 generally including storage costs、 fuel surcharges、 war risks、 etc

Fuel surcharges and war risks are products under specific circumstances. Generally、 the company's quotation is included in the freight.

International air express delivery costs are calculated in kilograms、 100 yuan per kilogram、 and 1 kilogram or less

1. It can be divided into "on board bill of lading" and "standby bill of lading" according to whether the goods are loaded on board.

2. The bill of lading is divided into "clean bill of lading" and "dirty bill of lading" according to whether the bill of lading is marked.

3. According to whether the bill of lading can be circulated、 it can be divided into "straight bill of lading" and "order bill of lading".

4. According to the mode of transportation、 it can be divided into "drop bill of lading"、 "transshipment bill of lading" and "combined transport bill of lading".

5. According to the complexity and simplicity of the bill of lading、 it can be divided into "full bill of lading" and "simplified bill of lading".