Envelopes – wrappers – and paperboard boxes – Paperboard box – Including tearing or breaking means for opening a nonunitary...
Patent
1988-11-23
1990-12-18
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
Including tearing or breaking means for opening a nonunitary...
53412, 53420, 53477, 156 69, 156224, 220258, 220359, 264292, 264154, 264372, 425297, 428461, 493 85, 493102, B65D 5100, B65D 570
Patent
active
049780565
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the packaging of various substances, especially foodstuffs, in closed containers.
DE-A-2344620 discloses a system for producing deep-drawn recesses in packaging material which, after filling, are sealingly covered with a continuous metallic lidding foil, and subsequently divided into individual containers or groups of containers. The packaging material comprises a base strip of thermoplastics and an upper strip of metal foil which are fed in parallel to a deep-drawing device, the thermoplastics strip being fed thereto through a preheating device. The deep-drawing device consists of a transverse row of female dies in the form of circular cylindrical cups reciprocable perpendicularly to the planes of the strips, a transverse row of circular intermediate rings, and a transverse row of circular thrust rings encircling respective cylindrical male dies and encircled by knives for severing circular discs of metal foil from the strip. The male dies press the metal foil discs into the female dies and simultaneously deep-draw circular parts of the thermoplastics strip. The profiled plastics strip so formed and containing transverse rows of recesses receiving the metal foil dishes is then advanced to a device for flattening over outwards the rim of each metal foil dish to form a horizontal flange thereon, the dishes are filled with the substance to be packaged and then the metallic lidding foil is applied over the profiled plastics strip with its metal foil dishes, and the lidding foil is heat-sealed to the flanges.
The packaging containers so produced have a number of disadvantages, for example the metallic lidding foil cannot be easily opened, for example cannot be simply peeled off, but has to be pierced, which can be a messy procedure, with the contents being spilled over the container and elsewhere. Secondly, unless the metallic lidding foil is relatively thick, it is easily split.
DE-A-2640591 discloses a system for forming dish-shaped lightweight packaging containers, each having a projecting edge flange and a plane base, from a workpiece of thin synthetic material and/or aluminum foil. The planar workpiece is held clamped between two annular rims, and a fluid under pressure acts upon one side of the workpiece. The central area of the consequently arching workpiece so formed is flattened by a supporting surface, which may be a piston head.
U.S. 2,615,201; U.S. 4,048,781 and U.S. 3,964,237 described similar systems in which sheet material to be deep-drawn is clamped between two circular rings of a deep-drawing device.
U.S. 4,141,195 discloses a method and apparatus for forming a heat-shrinkable secondary closure for a container, wherein filled, lidded containers are delivered to a secondary closure formation and application station, where a band of heat-shrinkable thermoplastics adhesive tape is wrapped around each container such that the tacky side of the tape faces the container, with tape overlapping the seam formed between the periphery of the lid and the sidewall of the container. The tape band is severed from the tape applied during wrapping, and heater means located adjacent the container shrinks the tape into compressive engagement with the periphery of the lid and the sidewall of the container as the tape is wrapped thereabout. Integral gripping tabs are formed at spaced positions in the tape prior to wrapping of the tape band and shrinking thereof, and once the band is shrunk into tight adhesive engagement with the container, the tab is positioned near an outer overlapping end of the band to provide convenient means for removal of the tape from the container. The end of the tape beyond the gripping tab is adhesively secured to an underlying portion of the band to retain the gripping tab in place.
With such closed container, opening of the container is normally accomplished by seizing the tab and pulling the same to unwind the tape completely from the container and then by removal of the lid. This can have the disadvantage that first the tape and thin the lid can be thrown awa
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Ball Martin F.
Vokins Ian M.
Coyne Brian J.
Elkins Gary E.
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