NAWON HTM-3788LDi, Operating Manual

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(4) Purpose of Machine and Installation
1) Most waterproof textiles are made of performance fabric which passes through
air but blocks water. However, water may pass through needle holes which are
created during sewing as shown in <Figure B> below.
[Figure A] [Figure B]
[Figure C]
Properly Sealed
No Air Allowed
6
2) In order to prevent water leak through the seam, this machine seals the seam
using hot wind as shown in <Figure A> above.
3) If the seam is properly sealed, there should be no air on the tape sealing space
as shown in <Figure C> below. Air could be created due to machine speed,
temperature, or pressure. The fabric and tape should be checked as well.