Adhesive bonding and miscellaneous chemical manufacture – Differential fluid etching apparatus – With microwave gas energizing means
Patent
1996-04-19
1999-03-23
Osele, Mark A.
Adhesive bonding and miscellaneous chemical manufacture
Differential fluid etching apparatus
With microwave gas energizing means
156584, 134 26, 134 953, 1341044, 134151, B32B 3500
Patent
active
058854010
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
This invention relates to a process and to an apparatus for removing shrunk-on sleeves or all-round labels from vessels according to the precharacterising clause of claim 1 and to the precharacterising clause of claim 10, respectively.
Processes for removing shrunk-on sleeves or all-round labels surrounding vessels are already known in which a parting line is first produced substantially transverse to the circumferential direction of a shrunk-on sleeve or an all-round label. Attempts are then made to blow off the cut-through all-round label or the shrunk-on sleeve by fluid jets (compressed air, water jets) aligned substantially radially in relation to the vessel outer wall (EP 0 587 358 A1) or to remove them by suction from the vessel outer wall by means of suction devices. In this respect it has been shown in particular that the detachment of the labels or shrunk-on sleeves after producing the parting line creates difficulties.
Accordingly, the underlying object of the present invention is to provide a process and an apparatus which permit improved detachment of the labels or shrunk-on sleeves.
This object is achieved with respect to the process by the characterising features of claim 1 and is achieved with respect to the apparatus by the characterising features of claim 10.
The production of a parting line in the covering material (all-round label, shrunk-on sleeve) can be effected in the known manner, e.g. by means of a cutter blade or a high-pressure water jet, for which purpose the vessels are preferably held clamped axially between their top and their bottom face on a conveyor device, generally on a continuously drivable turntable. After the parting line is produced, the vessels, e.g. drinks bottles made of plastics (PET) are held as far as possible in the region near their mouths with their bases free, so that the covering material is removed by fluid jets which are aligned obliquely from above, substantially axially in relation to the vessel outer wall, and which impinge at high pressure on the vessel outer wall, preferably above the top edge of the covering material.
Because the vessels are suspended with their bases free, the detached covering material can be conveyed away without problems and in a trouble-free manner.
The process and the apparatus which is suitable therefor can be used particularly advantageously in beverage filling lines for returnable bottles, particularly plastics bottles (PET), which have a neck collar below their mouths. The neck collar facilitates ease of handling of the bottles during the detachment of the covering material.
The fluid jets can be produced by compressed air and/or water. When water or another suitable liquid is used, a closed circuit can be produced by capturing the floated-off covering material and the liquid underneath the bottles, separating the covering material and feeding it to a press for compaction, for example, and feeding the liquid collected in a container to the nozzles for re-use, by means of a pump. Prior purification of the liquid by filtration or other measures is optionally effected. Moreover, cleaning substances may be admixed with the liquid in order also to effect a preliminary cleaning of the outside of the bottles during the removal of the covering material.
According to a further embodiment, it is particularly advantageous if the vessels are rotated about their vertical axes during the impingement of the fluid jets on their outsides, so that substantially almost the whole periphery of a bottle is impinged upon by fluid, even if fixed jet nozzles are used. In this respect it is advantageous if a plurality of jet nozzles are disposed in succession along both sides of the path of movement of the bottles, preferably with decreasing height as seen in the direction of conveying. It may also be advantageous to cause the individual fluid jets to impinge on the bottle walls at different angles, and preferably to fasten the jet nozzles so that they are adjustable.
Other advantageous forms of the process and of the apparatus are gi
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Krones AG Hermann Kronseder Maschinenfabrik
Osele Mark A.
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