#  Step 1: Prepare Airbags 

 



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Cut off a line of PA-PE to make airbags between two sealing lines.

   ![cut_airbags_1](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/1_01.png?itok=iCQAPpvX) 

 

   ![cut_airbags_2](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/cut_airbags_2.png?itok=oSzfnfCp) 

 

   ![cut_airbags_3](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/cut_airbags_3.png?itok=p1wj3ys_) 

 

Mark the points to be heat sealed. The rules can be detailed in [here](/hpn-manipulator/design/pneumatic-networks).

   ![draw_lines_1](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/draw_lines_1.png?itok=YEaplaBv) 

 

After finishing all the marks, draw a solid line at the position to seal the whole airbag.

   ![draw_lines_2](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/draw_lines_2.png?itok=Tibf6Vzp) 

 

Cut at the point 5mm outside from that solid line.

   ![cut_airbags_4](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/cut_airbags_4.png?itok=RJJiRWms) 

 

Thus, we get a marked line to make airbags.

   ![airbag_finial_1](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/airbag_finial_1.png?itok=TsIteliJ) 

 

#### Silicone tubes inside

 ![cut_tube_1](/sites/g/files/omnuum4601/files/2025-05/cut_tube_1.png)

 

Firstly, get 8 silicone tubes, 4.5 mm each: directly cut off those bits at the length of 4.5 mm,

 ![cut_tube_2](/sites/g/files/omnuum4601/files/2025-05/cut_tube_2.png)

 

Similarly, prepare 7 tubes of 9.5 mm in the same way.

 ![cut_tube_3](/sites/g/files/omnuum4601/files/2025-05/cut_tube_3.png)

 

 ![cut_tube_4](/sites/g/files/omnuum4601/files/2025-05/cut_tube_4.png)