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in a vacuum chamber under the pull-through vacuum or vacuum setting time, meet the requirement to continue its work after the vacuum pump to maintain the vacuum, when the control of heat seal the top of the solenoid valve of the balloon began to work, air, inflatable balloon inflated to seal the heat down to work closely with the seals fixed together, be the beginning of the work of heating, according to plastic heat sealing time needed to heat the requirements, then is deflated, the openings .
Frequently asked questions is:
Heat was not enough time, lax pocket close together, a vacuum leak.
The use of vacuum pump oil for too long, although the time to extend the vacuum, there is no vacuum required.
Upper and lower seal cavity damaged vacuum fail