#  Step 2a: Heat Press 

 



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 In order to seal the TPE envelope, you might use a heat press or an impulse sealer. If your LJS is thick and/or has a complicated geometry, the use of an acrylic frame, vacuum form and heat press would be more appropriate to create the airtight structure. Below we present the process of using a heat press to create a seal in a TPE envelope:

####  Sealing with a heat press machine

Sort      ![Step 2a- Part 1](/sites/g/files/omnuum4601/files/styles/hwp_1_1__360x360_scale/public/srtsandbox/files/dsc_0355.jpg?itok=C6sSUkRS) 

 

 

  Place the filling material for the LJS (e.g. paper sheets) on top of the TPE bottom layer formed to the acrylic frame.

 

 



Sort      ![Step 2a - Part 2](/sites/g/files/omnuum4601/files/styles/hwp_1_1__360x360_scale/public/srtsandbox/files/dsc_0354.jpg?itok=JVZkuQw6) 

 

 

  Adjust the placement of the tube within the opening in the acrylic frame. Make sure the tube is not above the frame height. 

 



Sort      ![Step 2a - part 3](/sites/g/files/omnuum4601/files/styles/hwp_1_1__360x360_scale/public/srtsandbox/files/dsc_0356.jpg?itok=BPqi1-SM) 

 

 

  Fold the TPE sheet over the acrylic frame to create the top layer above the filling material. 

 



Sort      ![Step 2a - part 4](/sites/g/files/omnuum4601/files/styles/hwp_1_1__360x360_scale/public/srtsandbox/files/dsc_0358.jpg?itok=vUlK1Ijb) 

 

 

  Place a PTFE sheet on top of the materials to prevent the TPE sheet from sticking to the heat press. 

 



Sort      ![Step 2a - Part 5](/sites/g/files/omnuum4601/files/styles/hwp_1_1__360x360_scale/public/srtsandbox/files/img_4569.jpg?itok=BOTYkbQZ) 

 

 

  Use heat press for 1 minute (at 270°F for green TPE) 

 



Sort      ![Step 2a - Part 6](/sites/g/files/omnuum4601/files/styles/hwp_1_1__360x360_scale/public/srtsandbox/files/dsc_0367.jpg?itok=csSnbSEX) 

 

 

  To ensure that there are no openings in the connection, cut the extra material outside the seal. Be careful not to cut into the sealed area.