I believe molding two halves with a vacuumpump to provide pressure will produce a better structure and allow me to better control wall thickness.
我认为两半的模具加上真空泵来提供压力能使结构更好，我也能更好的控制壁厚。
2
Connect the vacuumpump to the compound pressure gauge; open the compound pressure gauge andvacuumpump to vacuum the indoor unit and connecting pipe.
将真空泵连于复合压力表，打开复合压力表和真空泵对室内机和连接管抽真空。
3
The idea is with the help of vacuumpump to increase the pressure difference between material hopper andvacuum chamber, hence the packing environment can be achieved.