An improved method and apparatus for heat sealing bags having a mandrel with protruding needles for holding the bag material when the material is wrapped around the mandrel. The mandrel has a ridge for allowing easy penetration of an upwardly angled hot blade between the two overlapping ends of the bag. An apparatus composed of three hot blades of which the two outside blades enter the bottom of the bag and expand outward contacting an inner perimeter of the bag when the middle blade moves forward. The blades then retract and the bag is then fused together by pressure bars and cut by heat trimmers.
these are the yellow rolls that feed the circular weaving machine to make our seamless plastic bags.
for the first time i got to know how seamless bags are woven. the principle is as simple as explained in secondary school lessons.
i actually planned to do an installation with blue, white & yellow (plastic)threads in the campus using wind as basic stimulator but the client had his own plans…
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