B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
93/32
B31B 21/00 (2006.01) B31B 39/00 (2006.01)
Patent
CA 1264974
ABSTRACT In a process of manufacturing sacks from synthetic thermoplastic material, a tubular film is formed from a web of plastic film in that the side portions are infolded and their overlapping margins are adhesively joined by an adhesive seam, tubular sections are severed from said tubular film and said tubular sections are provided with bottom seam welds and are then filled and provided with top seam welds. two plastic film webs are moved in unison, sections of a woven fabric web of oriented plastic tapes are provided, which fabric sections are shorter than the distance between the subsequently formed bottom and top seam welds when said distance is measured along the flattened sacks. Said fabric sections are intro- duced between said plastic film webs with such a spacing relative to each other that the spaces bet- ween adjacent fabric sections overlap the regions in which the bottom and top seam welds are to be formed The plastic film webs and the fabric sections are brought together with a lateral offset. The exposed margins of the plastic film webs and the fabric sections are provided with coatings of hot-melt adhesive so that during the subsequent formation of the tubular film the mutually overlapping margins provided with coatings of hot-melt adhesive are adhesively joined. The tubular sections are served from the tubular film near the centers of the spaces between the fabric sections. The tubular sections are provided with the transver? extended bottom seam welds only in the tubular film.
499522
Achelpohl Fritz
Oelrich Hermann
Achelpohl Fritz
Marks & Clerk
Oelrich Hermann
Windmoller & Holscher
LandOfFree
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