In order to ensure that the Laminar Jamming Structure created presents the desired characteristics after being jammed, it is necessary that the TPE container is completely sealed and airtight. We present some strategies to identify leaks and correct them.
Identifying leaks
One method of identifying leaks in the LJS is to pump air in it and attach a one-way check valve (right) to the tube, preventing air from escaping. Large leaks would be obvious because the envelope will immediately deflate. For small leaks, you may submerge the structure in water and look for air bubbles. Another option is to search for air leaks by listening to the jammed structure with a stethoscope.
Simple fixes
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One quick way to fix leaks is to use butyl sealant tape in previously identified leaks. Although the method is not ideal for a practical application in which the LJS will undergo multiple cycles of jamming/unjamming, it is sufficient for fixing prototypes. |
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The places that leaks are most frequently found are around the tube connection. In order to prevent these leaks, you may reinforce the connection with PTFE thread sealant tape. |
Final Structure
After finishing the fabrication of your Laminar Jamming Structure, you may attach it to a laboratory vacuum source or to a hand operated vacuum pump and assess the difference in properties between the unjammed (vacuum off) and the jammed (vacuum on) structure.