How were the giant flags hung on the helicopter to celebrate the meeting made?

The huge flag hung on the helicopter to celebrate the conference was made using aerospace technology.

After undertaking the red palace lanterns for the 50th and 60th anniversary celebrations of the founding of the People's Republic of China, the huge red flag for the military parade commemorating the 70th anniversary of the victory of the Anti-Japanese War, the huge red flag for the military parade for the 70th anniversary of the founding of the People's Republic of China, and large-scale inflatable lantern projects, China Aerospace The 508th Institute of the Fifth Academy of Science and Technology Group Co., Ltd. once again undertook the task of developing a huge red flag for the celebration of the 100th anniversary of the founding of the Communist Party of China.

“When flying in the airflow, the inertial force on the tail of the flag is proportional to the mass distribution rate of the material. Therefore, while ensuring the strength, the lighter the flag material, the more weight is loaded on the flag. The less destructive it is," the technician said. After comparing various types of materials, the 508 Research Institute's development team finally selected a high-strength brocade thick material used for spacecraft parachute canopies as the flag surface material to adapt to the erosion of high-speed airflow.

This kind of material has high strength and light weight. Even if a small area is damaged, there will be no serious detachment and the vibration sound is small. The linear density of its brocade filaments can reach 20 denier or less, and its thickness is only one-third of the diameter of a normal human hair, but its strength can reach twice that of ordinary civilian brocade filaments, and is stronger than the parachute canopy used for the Shenzhou spacecraft parachute. The material is 17% stronger and 15% lighter.

However, the light transmittance of this material is too strong, and the high-altitude flight display effect is not perfect. 508 Research Institute worked together with material manufacturers to use a special coating process on the original fabric, which not only improved the appearance, making the flag pattern clearly visible from the ground, but also made the party flag very rainproof, even if raindrops fell on the flag. It will slide down quickly without affecting the party flag flying high in the sky.

"Seven steps to make a flag" technical processing technology:

The "seven steps" are "picking, cutting, dotting, sewing, inspection, recording and completion", from material selection to production Every step of the finished product is strictly controlled to ensure nothing goes wrong. For example, each piece of fabric must be left naturally for more than 12 hours before cutting to release material stress and avoid dimensional deviation caused by wrinkles.

Each splicing position uses the sewing process of a spacecraft parachute to ensure that the number of stitches within the fixed sewing size meets the range requirements. After the production of each party flag and slogan is completed, the raw materials, apparent quality, sewing quality, installation position, and product size will be inspected and accepted in accordance with the development standards of aerospace parachutes. There will also be independent and complete quality process records that can be traced layer by layer.

The above content refers to The Paper - The huge party flag and slogans hung on the helicopter at the celebration meeting were manufactured to aerospace standards