FIELD: process engineering.
SUBSTANCE: sealer comprises bottom plate, circular sidewall, cover plate, web plate and heater. Lower end of circular sidewall is located at bottom plate and tightly coupled with bottom plate. Cover plate is tightly fitted at top end of circular sidewall while web plate is arranged at mid part over circular sidewall height. Web plate edges tightly connected with circular sidewall inner surface, web plate divides the space confined by bottom plate, circular sidewall and cover plate into first closed space and second closed space. These two closed spaces are provided with appropriate channels for air ejection at evacuation.
EFFECT: better sealing.
16 cl, 7 dwg
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