Large flexible container with replaceable inner liner

Details Large flexible container with replaceable inner liner Large flexible container with replaceable inner liner

1993-04-13

1994-04-12

Shoap, Allan N.

Flexible bags

With closure

For access opening in sidewall

383 16, 383 3, 383101, 383111, 383119, 220403, B65D 3026

Patent

active

053020294

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION

This invention relates to a large flexible container for gaseous, liquid, or pourable products with a tear-resistant outer shell and with a replaceable inner liner.
Large containers of this type are known from DE-PS 33 36 077. Besides the problems of undesirable air inclusions between the outer shell and the inner liner described in this German Patent, such large flexible containers can be handled only with difficulty when being set up and filled. The inner liner has to be introduced into the outer shell through the manhole, and to do this a man has to crawl into the outer shell to mount the fittings necessary for filling, emptying, and venting the inner liner. In this procedure, it is not impossible for dirt also to be introduced into the outer shell, which can destroy the relatively thin and sensitive inner liner even when being filled.
It is the purpose of this invention to propose a new design for such large flexible containers and a new procedure by which such containers can be set up and filled considerably more easily and with fewer problems.
According to the instructions of the invention, a large flexible container of this type is designed with a so-called front face from which the large container extends in an essentially elongated form. The cross-sectional shape of the large container is intended to be designed so that it conforms to the natural spreading forces of a drop of water standing on the bottom, to guarantee that no peak stresses can build up in the outer shell from the pressure of filling. This applies also to the front face, which has a bulged design corresponding to the filling pressure decreasing from bottom to top.
The front face thus provided is reinforced pursuant to the invention by at least one flexibly pliable bar that extends essentially perpendicular to the base over the front face when the container is filled. This reinforcement of the front face is necessary when the container is still untilled in order to be able to erect the front face of the outer shell ahead of time, i.e., to bring the front face into an almost vertical position after initially laying out the outer shell flat on the floor at the particular location, so that an operator can approach the front face without stepping on it. The pliable properties of such a reinforcing bar at the same time make it possible for the front face to bulge out later corresponding to the filling pressure when the container is being filled.
The erection of the front face requires a large container such that there is at least one point of attack for pulling at the top of the front face in the form of an eye or the like. The front face can then be erected relatively easily by means of a pull cord, especially when the pull cord is suitably pulled over a roller at a higher level (for example, on a tripod, a ladder, or the like). According to the instructions of the invention, both the manhole sealed linearly, preferably with a linear closure aligned essentially perpendicular to the bottom or to the base of the container, and all fittings necessary for filling, emptying, and venting the inner tank are also located on the front face.
This provides the advantage of the front operation pursuant to the invention. The inner liner can be inserted into the outer shell through the manhole in the front face, without having to enter the outer shell for the purpose, and at the same time, all of the necessary fittings that have to be connected to the inner liner and fed through the outer shell can also be assembled through the manhole in the front face, specifically without entering the outer shell, since according to the instructions of the invention all of the necessary fittings of the inner liner are positioned on the front face of the container, readily accessible after erection.
It is also very advantageous according to the instructions of the invention to provide a compressed air connector in the front shell that is readily accessible in the new large container for inflating only the outer shell.
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REFERENCES:
patent: 1809013 (1931-06-01), Boardman
patent: 2507939 (1950-05-01), Smith
patent: 3167209 (1965-01-01), Jones
patent: 3510142 (1970-05-01), Erke
patent: 3578050 (1971-05-01), Weingarten et al.
patent: 3802470 (1974-04-01), Coleman
patent: 3965953 (1976-06-01), Becker
patent: 4099656 (1978-07-01), Neumann et al.

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