JPH05154455A - Method for peeling aluminum foil label - Google Patents

Abstract

PURPOSE:To decrease the pollution of a washing tank by notching the aluminum foil label stuck to a bottle and immersing the bottle into an aq. HCI soln., thereby peeling the label. CONSTITUTION:The label stuck to the bottle is notched as shown in Fig. and the bottle is immersed in the aq. HCl soln. and is rested or is subjected to an ultrasonic treatment. The time when the whole label can be removed by strong rubbing with a brush and the time when the label can be removed with light rubbing with the finger, etc., are respectively 15 minutes and 30 minutes in the case of resting and are 5 minutes and 10 minutes, respectively, in the case of combination use of ultrasonic waves when the bottle is immersed into the soln. by specifying the wet.%. of the HCI to about 15 to 25% in such a case. The peeled label peels in the form nearly approximate to the original form without turning to colloid. The peelability is improved if the number of the notches is increased. The label fumes and there is a problem in safety if the concn. of the aq. soln. is >=25wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of peeling an aluminum foil label attached to a bottle.

[0002]

2. Description of the Prior Art The removal of the aluminum foil label attached to the existing beer bottle is carried out with a NaOH hot alkali cleaning solution, but it has the following drawbacks. (1) The aluminum foil label attached to the beer bottle is removed during cleaning with a NaOH hot alkaline cleaning solution.
At this time, aluminum reacts with NaOH to form NaAlO.
Produces ₂ (sodium aluminate), causing reduction and deterioration of NaOH. (2) The dissolved label becomes a colloidal suspended substance in the washing solution to reverse-contaminate the bottle. (3) Even if the washing liquid is filtered to remove the colloidal suspended matter, it immediately becomes clogged and it becomes difficult to filter, so that the washing liquid cannot be easily purified. (4) While the number of washings is small, a sufficient bactericidal effect can be obtained, but if the number of washings increases and a large amount of the dissolved colloidal suspended substance of the label begins to coexist, the bactericidal effect is reduced due to decrease / deterioration of NaOH. descend. (5) Iron rust due to the crown attached to the mouth of the bottle is NaOH
It cannot be removed with a hot alkaline cleaning solution and remains in that state.

[0003]

In view of the above-mentioned state of the art, the present invention aims to provide a method for peeling an aluminum foil attached to a bottle, which is free from the problems in the prior art.

[0004]

The present invention is a method for peeling an aluminum foil label, which comprises notching an aluminum foil label attached to a bottle and immersing the aluminum foil label in an aqueous HCl solution.

The aluminum foil peeling method of the present invention is generally carried out in a pre-process of a hot alkali bottle washing machine for a bottle to which an aluminum foil is attached.

In the present invention, the notch in the aluminum foil can be formed in any shape as shown in FIGS. 1 (a), 1 (b) and 1 (c). The more notches, the more preferable. .

Further, the concentration of the aqueous HCl solution used is
Not very strict, but a concentration of 15-25% by weight
It is preferable to use an aqueous solution of HCl. Also, HCl
When ultrasonic waves are applied at the same time as the immersion in the aqueous solution, the peeling effect is further promoted.

[0008]

[Function] The glue that attaches the aluminum foil to the bottle is protein paste, and the main component of the protein paste, casein, is H
It is soluble in strong acids such as aqueous Cl. Therefore, the present invention uses an aqueous solution of HCl as a stripping solution for the aluminum foil. The HCl aqueous solution also has a secondary effect of removing iron rust originating from the crown attached to the mouth of the bottle.

The notch in the aluminum foil is
This is because the aqueous solution of HCl quickly permeates and contacts the label paste adhering to the bottle to dissolve the paste.

[0010]

EXAMPLE An example of a peeling method for peeling off the aluminum foil label attached to the beer bottle will be described. Since the label paste was made of a protein called casein, an aqueous solution of HCl was used as the stripping solution.

The label attached to the beer bottle is notched as shown in FIG. 1 and immersed in an aqueous solution in which HCl and water are mixed at various weight ratios. Table 1 shows the results obtained by injecting HCl between the bottle and the label for a certain period of time by using two methods, that is, the case of applying the solution, and rubbing with a brush to remove the solution.

Table 2 shows the results of the label peeling test of the label attached to the beer bottle using the current NaOH hot alkaline cleaning solution (80 ° C.).

[Table 1]

The above is the result for the notches shown in FIG. 1A, but the peelability is further improved by increasing the number of notches as shown in FIGS. 1B and 1C.

[Table 2] (Judgment) ◎: All were easily peeled off by rubbing lightly with a finger or a brush ◯: All peeled off by rubbing with a strong brush ×: No peeling at all

As a result of the above, the following has been found. (1) Put a cross cut on the aluminum foil label attached to the beer bottle, and the HCl concentration is about 15 (wt%)
As a result of testing by immersion in an aqueous solution of HCl (about 25% by weight) and standing, and application of ultrasonic waves in an ultrasonic immersion tank, the former can be peeled off 100% in 30 minutes and the latter in 10 minutes. understood. It was also found that the peelability was poor without the notch. (2) It was found that the peeled label did not become colloidal and peeled off in a state close to the original label. (3) When an attempt was made to separate the peeled label pieces by filtration, it was possible to easily remove from the HCl aqueous solution and the HCl aqueous solution could be purified, so that the HCl concentration was about 15 (wt%) to 2
It was found that it can be repeatedly used as a stripping solution while maintaining the concentration of 5 (wt%). However, it cannot be used when filtration is not possible due to dirt other than label pieces such as sand or foreign metal. (4) The higher the concentration of the HCl aqueous solution, the better the peelability of the label, but when the concentration becomes about 25 (wt%) or more, HCl starts to emit smoke. Therefore, it was not used in consideration of safety. (5) If a large number of fine cutouts are formed on the surface of the label, the permeability of the HCl aqueous solution is further increased, so that the label can be peeled off without rubbing with a brush. (6) Since the HCl aqueous solution dissolves iron, iron rust can be removed by the crown. (7) Hot alkaline cleaning solution with current NaOH (80 ℃)
However, the label could be peeled off regardless of the presence of the notch, but the label became colloidal and could not be filtered.

FIG. 2 shows an example of applying the label peeling method of the present invention to an actual machine. That is, as a pre-process of the current NaOH hot alkali cleaning device 4, it comprises a label notch device 1, an ultrasonic cleaning device 2 with an HCl aqueous solution, and a neutralizing device 3 for the HCl aqueous solution adhering to the bottle.

[0016]

According to the present invention, as a stripping solution, for example, an aqueous HCl solution having a concentration of about 15 (wt%) to 25 (wt%) is used, so that it can be applied to a beer bottle in the previous step of a current NaOH hot alkaline washing machine. Since the attached aluminum foil label is peeled off, the aluminum foil label dissolution step of the NaOH hot alkali washing machine can be eliminated and the contamination of the washing tank can be reduced.
The following effects were obtained. (1) The aluminum foil label attached to the beer bottle was previously removed in the HCl aqueous solution in the previous step of the current NaOH hot alkaline washing machine, so aluminum and Na
There is no reaction of OH and it is possible to prevent the decrease and deterioration of NaOH. (2) Since there is no colloidal label-dissolved pollutant, there is no reverse contamination of the bottle. (3) Since no colloidal label-dissolving pollutant is present, the NaOH hot alkali washing solution can be easily purified without filtering or clogging. (4) Since colloidal label-dissolved pollutant does not exist, it is possible to prevent deterioration of bactericidal effect due to decrease and deterioration of NaOH. (5) Iron rust due to the crown attached to the mouth of the beer bottle,
Can be easily removed with aqueous HCl. (6) Since the step of dissolving the aluminum foil label with the NaOH hot alkali cleaning solution is omitted, the contamination of the cleaning solution is reduced, the freshness of the NaOH hot alkaline cleaning solution is maintained, and an efficient sterilization washing bottle is possible.

[Brief description of drawings]

FIG. 1 is an explanatory view of various cutouts put in an aluminum foil label in the present invention.

FIG. 2 is a process diagram in which the present invention is applied to a cleaning process of a bottle with an aluminum foil label.

Claims (1)

[Claims] 1. A method for peeling an aluminum foil label, which comprises notching an aluminum foil label attached to a bottle and immersing the aluminum foil label in an aqueous HCl solution.