Dispensing – With cutter and/or punch – To form dispensing opening in container
Patent
1994-03-09
1995-04-18
Shaver, Kevin P.
Dispensing
With cutter and/or punch
To form dispensing opening in container
222 90, B67B 724
Patent
active
054070996
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for withdrawing flowable filling material through a wall of a bag having flexible walls.
PRIOR ART
Frequently, a flowable filling material, particularly resin-like plastic, shall be withdrawn from a bag without coming into contact with the atmosphere or with the human skin. Also, only a partial amount shall often be withdrawn, and it is then desirable that a detachable closure can be conveniently provided at the bag. For this and other purposes, devices of the kind initially described have been developed.
From the German patent specification 25 25 000, a device for withdrawing flowable filling material has become known wherein separating means provided at the withdrawing part consist of a central conical tip which comprises a through-going opening in its sidewall. A flat conical surface is connected to its base which forms a sealing surface and co-operates with a matching sealing surface of a sealing part inside the bag. Upon the plugging-together, the bag wall must be severed before the sealing surfaces meet and a further relative movement in the plugging direction is no longer possible. In this reference, nothing is said about how the interplugged parts are held together.
From the German patent specification 31 29 777, a device for withdrawing flowable filling material through a flexible wall of a bag has become known wherein an annular coupling portion is adhered to the inner wall o the bag. A further coupling portion serving as the withdrawing part is tubular and includes annular ridges saw-teeth-like in cross section at the outer side thereof. The withdrawing part is adapted to penetrate the bag wall in the area of the opening of the annular inner coupling portion with the annular ridges snappingly engaging the edge of the opening of the annular coupling surface of an annular ridge facing oppositely to the plugging direction engages the associated surface of the annular coupling portion under pretension which is generated by the pierced bag wall. The known withdrawing device requires a fixation of the annular coupling portion in the interior of the bag which is relatively expensive in production.
The British patent specification 1 104 359 discloses a withdrawing device wherein an annular withdrawing part is sealingly attached to the inner wall of the bag, e.g. by welding. The sleeve-like withdrawing part includes an annular groove which is engaged by the edge of an opening of an annular sealing portion by a snapping operation when the withdrawing part pierces the bag wall and is plugged into the sealing portion. The withdrawing part and sealing part have annular cylindrical sealing surfaces which serve to restrict a leakage of the flowable medium between the withdrawing and sealing parts.
With the known devices, the bag wall first is fixed before it is pierced by suitable separating means. Such devices may work satisfactory if the pressure during the dispensing process is not too large. In case the pressure exceeds predetermined values, it may occur that the sealing cannot be maintained sufficiently or the filling material leaks out due to failures in the sealing and/or a rupture of the bag wall. This has to be absolutely avoided for obvious reasons.
SUMMARY OF THE INVENTION
The invention provides a device for withdrawing flowable filling material through the flexible wall of a bag which effectively restricts an insufficient sealing or a rupture of the bag wall in the area of the withdrawing device and thus an undesired leakage of the material.
The device of the present invention for withdrawing flowable filling material through a wall of a bag having flexible walls comprises a sealing member arranged inside said bag, which has an annular sealing surface and an axial through-going passage approximately circular in cross section and extending substantially perpendicular to said annular sealing surface, which passage defines an axial sealing surface, and a withdrawing member arranged outside the bag. The withdrawing member has a tubular portion provided with an ou
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Heuke Karl-Heinrich
Schmitz Guenter
Anderson David W.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Shaver Kevin P.
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