Apparatus for filling a sack with a flowable material

Fluent material handling – with receiver or receiver coacting mea – Evacuation apparatus

Patent

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Details

141 71, 141114, 141315, B65B 3104

Patent

active

055012540

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to an apparatus for filling a sack with a flowable material, comprising a container having an inlet and an outlet and a sack holder to fasten the sack to be filled to the outlet of the container.
When a flowable material such as putty or jointing compounds or even cement is packed into sacks, the material is to be packed as tightly as possible, i.e. the material should contain as little air as possible. Before packing, most flowable materials contain a moderately large amount of air.
2. Discussion of the Prior Art
In most prior art methods the flowable material is poured into a sack, whereafter the sack is set vibrating. This is ineffective, especially if the sack is impermeable to air as is often the case.
It is also known to use a generally funnel-shaped precontainer or intermediate container into which the flowable material is first fed and to the outlet of which the sack to be filled is fastened. The flowable material in the container is deaerated by sticking a deaeration probe into the material. A drawback is that it is difficult to make the material flow once the air has been removed. In addition, the probe makes a hole filled with air and when the material settles, the air in the hole draws into the material. A similar probe has also been positioned in a filled sack but the probe then requires space and since the surface of the probe is rather small, a long deaeration time is needed. A deaeration probe of this kind is also apt to be blocked by the flowable material around it.


SUMMARY OF THE INVENTION

The object of the invention is to provide a new apparatus for effectively filling a sack with a flowable material, eliminating the drawbacks of the known apparatuses.
The apparatus according to the invention is primarily characterised in that cross-section of the sack in a filled condition, essential part permeable to air, permeable wall, and means to keep the sack closed during the suction of the air, with the exception of the mouth of the sack fastened to the outlet of the container, and to open the sack to receive the flowable material after completed suction of the air.
The wall of the container enclosing the flowable material can be advantageously made of porous sheet metal sold under the name DYNAPORE.RTM..
Advantageously, the wall of the container enclosing the flowable material is surrounded by a housing connected to a vacuum source. Thus the container has two walls, the inner wall being porous.
After deaeration the suction is stopped and the flowable material is allowed to fall into the sack. It is suggested that to ensure the fall of the material the porous inner wall of the container should be provided with a small clearance. Alternatively, or in addition, a pressure stroke can be used to ensure that the flowable material becomes totally detached from the inner wall of the container. In most cases the inner elasticity of the compacted flowable material is adequate to loosen the material from the inner wall of the container, whereby the material falls into the sack like a stone.
Deaeration is effective because of the large evacuation surface. The deaerated, compacted flowable material has approximately the same form as the sack in its final, filled condition, and since the flowable material opens the sack on falling, no air pocket is formed at the bottom of the sack.
The outlet of the container may be open, whereby the closed sack supported by the closing means below the mouth of the sack carries the flowable material during the suction of the air.
Alternatively, the outlet of the container may be provided with a two-part pivot plate which advantageously has a generally V-shaped form when seen from the end in a closed position, the mouth of the sack being fastened either to the arms of the V or with a slide plate.


BRIEF DESCRIPTION OF THE DRAWINGS

In the following the invention will be described with reference to the embodiment presented schematically in the attached drawing, wherein
FIG. 1 shows the app

REFERENCES:
patent: 3260285 (1966-07-01), Vogt
patent: 3586066 (1969-05-01), Brown
patent: 3707172 (1972-12-01), Obara
patent: 3785410 (1974-01-01), Carter
patent: 3788368 (1974-01-01), Geng et al.
patent: 4579154 (1986-04-01), Mu/ ller
patent: 5244019 (1993-09-01), Derby
patent: 5275215 (1994-01-01), Derby

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