Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1997-12-22
1999-11-16
Gallagher, John J.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156155, 156315, 156344, 428 43, B65C 100
Patent
active
059850744
DESCRIPTION:
BRIEF SUMMARY
DETAILED DESCRIPTION OF THE INVENTION
This invention relates to an adhesive system for applying wrap-around labels to hollow containers and to a process for forming a readily breakable bond between wrap-around labels and hollow containers using this adhesive system.
BACKGROUND OF THE INVENTION
At the present time, casein-based glues are mainly used for labeling hollow containers, for example glass and polyethylene terephthalate bottles. These aqueous formulations are mainly based on a casein component and a tackifier resin along with certain additives. WO 93/03110, for example, is mentioned in this regard. This document describes an adhesive based on casein, water-soluble extenders, fillers and, optionally, other additives, the adhesive characteristically containing resinic acid derivatives and alcohol. This provides for the satisfactory labeling of wet glass bottles, even at temperatures of 15.degree. C. and even if the casein content is well below the usual concentrations of more than 18% by weight.
Unfortunately, the above-mentioned labeling adhesives containing a casein component have the disadvantage that the labels are extremely difficult to remove during cleaning. Thus, the following inter alia is stated in European patent application 503 112, column 1, line 36 to column 2, line 52: "Hitherto, the labels have been washed off with heated wash liquor using large quantities of water. The soil content of the wastewater is correspondingly difficult to handle because not only is it necessary to filter the waste-water to remove cellulose fibers, it is also particularly important to eliminate metal components, more particularly aluminium compounds, from the wastewater where they accumulate to a considerable extent from the print on the labels, i.e. from the pigment components of the labels. The labels are removed in the bottle washing machine using an approximately 2.5% sodium hydroxide solution at an average temperature of 82.degree. C. During this removal process, parts of the paper coating and hence pigments and lacquers from the print on the labels naturally pass over into the sodium hydroxide solution. Labels thus contaminate the liquor with soils which are now classified on the basis of chemical oxygen demand (COD). Breweries have to pay their waste-water dues according to the COD level."
In European patent application 503 112, it is proposed to solve the problem by mechanically removing the label from the empties before washing. This is made possible by inserting a separating layer between the label and the original adhesive layer. The label can thus be removed without tearing. However, the adhesive layer remains on the bottle and has to be removed by wash liquor. Accordingly, the problem of completely removing the labels is not solved.
According to DE-OS 34 34 141, the original adhesive (glue) is replaced by an assembly or fixing adhesive. This adhesive is supposed to have the property of not curing. Accordingly, a label applied to a bottle with this adhesive can be completely removed at any time. What the adhesive consists of is not disclosed. The adhesive is applied over the entire area between the surface of the bottle and the label. However, it is a disadvantage of fixing adhesives that they require a dry substrate.
In their prospectus entitled "Autosleeve", published in 1993, the Automated Label Systems Company proposes a polyethylene wrap-around label for labeling bottles which is drawn over the bottle in its expanded state and, after contracting, applies itself firmly to the bottle. Accordingly, no adhesive at all is used here. The label is cut through with a high-pressure water jet in the same way as with a knife. Apparently the bottle is not damaged. However, the polyethylene label still has to be disposed of.
German patent 34 42 998 describes a process for applying a wrap-around label to a container. In this process, a limited zone of the front part of the label is initially attached to the wall of the container and, after wrapping of the label around the container, a limited zone of t
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Gossen Ralf
Heemann Marcus
Herlfterkamp Bernhard
Klingberg Wolfgang
Onusseit Hermann
Gallagher John J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Ortiz Daniel S.
Szoke Ernest G.
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