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
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Place the filling material for the LJS (e.g. paper sheets) on top of the TPE bottom layer formed to the acrylic frame.
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Adjust the placement of the tube within the opening in the acrylic frame. Make sure the tube is not above the frame height.
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Fold the TPE sheet over the acrylic frame to create the top layer above the filling material.
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Place a PTFE sheet on top of the materials to prevent the TPE sheet from sticking to the heat press.
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Use heat press for 1 minute (at 270°F for green TPE)
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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.
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