Package making – Methods – Forming or partial forming a receptacle and subsequent filling
Patent
1996-06-06
1998-09-29
Moon, Daniel
Package making
Methods
Forming or partial forming a receptacle and subsequent filling
53433, 53511, 53551, 53559, B65B 4700
Patent
active
058131973
DESCRIPTION:
BRIEF SUMMARY
The invention concerns the packaging of fluid or semi-fluid products (that is, in liquid, semi-liquid, pasty, powdery form or in small-sized pieces) in thermoformable synthetic resin containers.
Prior art involves a process in which the chamber of the container is formed by first placing in a die two laminas of thermoformable synthetic resin in such a way that the opposing faces of the die, which surround the cavity of the die, heat solder the two laminas so as to create an unexpanded envelope within the cavity of the die. Immediately afterwards, a hot pressurized gas is introduced into the unexpanded envelope through one or more thin conduits to expand it, pressing its sides against the internal surfaces of the die that define the external shape of the container. Subsequently the said conduits are retracted and the laminas are completely soldered, also in the areas through which the said conduits passed. Subsequently the chamber is cut in a suitable area in order to create an opening; it is then filled through the said opening and finally the opening is re-closed by soldering in order to seal the contents.
U.S. Pat. No. 3,423,902, discloses a plant for the manufacture of flanged plastic containers in which two vertical curtains of thermoformable plastic material are inserted in the cavity of a die, a vertical tubular element being interposed between them, said tubular element being provided with a plurality of longitudinal passages through which selectively pressurized air is injected to form the container and subsequently a filling product is introduced into the container itself.
However the container manufactured by means of said plant cannot be completely filled with the product, because at least the presence of the tubular element in the container when the product is introduced into it prevents complete filling of the container when the tubular element is withdrawn from it before sealing the formed container.
Furthermore, operation of said plant is quite slow, mainly because the container must be filled in the same station, i.e. the die, in which forming takes place.
The advancing downwards of the vertical curtains is produced by a vertically downward stroke of the die in its closed condition, the die then being opened and then performing an upward return stroke. This cycle of movement of the die is guided by roller followers cooperating with fixed cams.
U.S. Pat. No. 3,505,705 discloses a plant similar to that of U.S. Pat. No. 3,423,902 except that it produces flangeless containers by including in the die electric heating elements around the outlines of the die cavities.
DE-B-1 180 301 discloses a plant which differs from those of U.S. Pat. Nos. 3,423,902 and 3,505,705 in a number of significant respects among which are that the containers are formed from a tube of plastics extruded round the vertical tubular element, that the tubular element extends through both of the top and bottom sides of the die during filling of a previously formed container, and that the die is formed of six sections which perform a complicated cycle of movements relative to each other and to the tubular element, which itself reciprocates vertically.
EP-A-0 169 183 discloses a plant in-which containers are produced by continuous extrusion of plastics, blow-moulding of the containers between two loops of die sections carried upon endless conveyors, the pressurized air being introduced horizontally to form the containers and the product being therafter introduced by way of a vertical filling tube, the closing sealing of the container being performed between each adjacent pair of containers at a time when the product is in a condition overflowing from the upper container of the pair into the next higher container.
U.S. Pat. No. 5,223,073 discloses a blow moulding system in which advancement clamps located before and after an array of moulds move two mutually facing films in a direction in which the following are arranged in sequence: two welding half-moulds, which by mutually welding the two films in preset regions define cells
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patent: 3505705 (1970-04-01), Stroop
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patent: 4747253 (1988-05-01), Schulte
patent: 4964259 (1990-10-01), Ylvisaker et al.
patent: 5454208 (1995-10-01), Kawano
Moon Daniel
Paradiso John
Unifull S.p.A.
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