At 13:59 on November 18th, Beijing time, I learned from the Beijing Aerospace Flight Control Center that the Shenzhou 11 spacecraft return capsule has successfully landed in the scheduled area of ​​central Inner Mongolia, and the astronauts Jing Haipeng and Chen Dong good. The Tiangong 2 and Shenzhou 11 manned missions were a complete success. At 13:11, the Beijing Aerospace Flight Control Center issued a return command to the Shenzhou 11 spacecraft through the ground monitoring station, and the orbital module and the return capsule were successfully separated. Thereafter, the spacecraft returns to the brake engine and the return cabin is separated from the propulsion bay. They have been working and living in the Tiangong-2 Space Laboratory for 30 days, creating a new record for the space time of Chinese astronauts. At 1305 hours, the return module landed safely in the planned area of ​​central Inner Mongolia. The landing site and the search and rescue team responsible for the search and rescue missions found the target in time and arrived at the returning cabin landing site in the first time. After returning to the cabin door, the medical insurance medical staff confirmed the astronauts' health and reported the situation to the mission headquarters. The Shenzhou 11 spacecraft was launched from the Jiuquan Satellite Launch Center at 7:30 on October 17, and then docked with Tiangong 2 to form a combination. Two astronauts entered the Tiangong No. 2 for a 30-day station. During the on-orbit flight, a series of space science experiments and technical tests were completed. The successful completion of the manned missions of Tiangong 2 and Shenzhou 11 marked the decisive and important achievements of the space laboratory phase mission of China's manned spaceflight project and laid a more solid foundation for the subsequent construction and operation of the space station. Peel Mask PCB
Peel able masks are used in order to protect selected solder holes against plugging during mass soldering or to protect carbon elements and gold plated contacts during mass soldering. Peel able masks are screen printed.
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Requirements
• The peelable mask must adhere sufficiently well to the PCB so that it does not peel off when handled correctly.
• It must be able to endure a two to three time soldering process without peeling off, but must remain detachable.
•After soldering of the PCB, the peelable mask must be able to be detached – preferably in one piece. In case of metallized holes, no mask
residue must be left in the drill holes or on the surface of the PCB. In the case of non-metallized drill holes, however a certain amount of residue
can remain.
• The peelable mask must be able to resist conventional solvents such as chlorinated and fluorinated hydrocarbons, isopropanol, conventional
fluxes and similar.
• Particular requirements: The roughness U of the edge of the mask can be 0,5 mm from the tip to the base (left figure
below).