JPS5934577B2 - How to label adhesive sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for labeling adhesive sheets.

The adhesive sheet is constructed by bonding an adhesive label coated with an adhesive to a release sheet coated with a release agent such as silicone.

(For information on the structure, see Monthly, Processing Technology-197
Various forms are described on pages 1 to 13 of the November 3rd issue.

) When adhesive labels are automatically peeled off using an air jet auto-labeler and attached to bottles such as liquor bottles, soy sauce bottles, or other items, when the adhesive label peels off from the release sheet, the end of the peel This often results in problems such as the adhesive label becoming difficult to peel, making it impossible to send out the adhesive label smoothly, and causing misalignment, tilting, etc.

In order to investigate the reason why the peelability becomes slow at the end of peeling when an adhesive label is peeled off from a release sheet, we conducted various investigations and studies.As a result of measuring the surface of the adhesive sheet with a surface electrometer during the peeling process, we found the following results as shown in Figure 1. It was discovered that positive and negative charges are generated, and as the peeling progresses, the generated charges migrate toward the unpeeled region and accumulate at the ends.

It was also found that the weight of peeling at the ends is caused by the bonding force of accumulated charges.

Regarding charge transfer, the potential in the first half of the peeling process from the beginning of peeling to the middle of the peeling does not change much, but as the peeling moves from the middle to the end, the potential gradually increases, and at the end. It has been confirmed that the potential shows a maximum at the end of the adhesive label, and this maximum potential is related to the length of the adhesive label, such that as the adhesive label becomes longer, the amount of accumulated charge in the end region increases proportionally.

The present inventors have discovered the phenomenon of the generation of electric charges and the fact that smooth peeling of adhesive labels is possible by removing them, and have completed the present invention.

The structure of the present invention is to bring a conductive substance into contact with the surface of the adhesive label and the back surface of the release sheet before or during the peeling process of the adhesive sheet, and apply an opposite electrostatic voltage to neutralize the peeling charge by using both surfaces as electrodes. It is characterized by this.

Hereinafter, the structure of the present invention will be explained with reference to the drawings. Fig. 2 is a schematic diagram of an air jet type autolabeler, and Fig. 3 is an enlarged view of the vicinity of the dispenser plate of the air jet type autolabeler. sheet 1
When the tip 3 of the dispenser plate 2 is bent, the adhesive label 4 is peeled off from the release sheet 5, and after being peeled off, it moves to the suction cup 7 of the air box 6, and after being sucked by the suction cup, the alcohol It is sprayed and pasted onto an article 8 such as a bottle.

In the present invention, before or during the peeling process of the adhesive label 4 being peeled off from the release sheet 5 at the tip 3 of the dispenser plate 2, a brush 9 made of conductive fiber as a conductive substance is brought into contact with the surface of the adhesive label, and the brush 9 is simultaneously peeled off. A conductive substance is also brought into contact with the back surface of the sheet 5.

In this way, electrostatic voltages opposite to the peeling charges are applied from both surfaces.

The conductive substance used in the present invention has an electrical resistance of 10
Made of a conductive material with a resistance of 9 Ω/cm or less, such as a metal brush,
A metal foil or the like is suitable, and a metal brush made of a polyester core and vapor-deposited aluminum is particularly preferable because it has appropriate elasticity.

Further, the electrostatic voltage is applied by an electrostatic voltage application device 10.

When applying an electrostatic voltage, it is necessary to apply charges that are opposite to the charges generated on the adhesive label side and the charges generated on the release sheet side when the adhesive label is peeled from the release sheet.

For example, if the charge generated on the adhesive label side is positive, a negative charge is applied.

This also applies to release sheets.

Note that the amount of electrostatic voltage applied is desirably equal to the amount of charge generated by peeling as much as possible, since the purpose of the present invention is to neutralize the charge generated during peeling by the applied voltage.

It is not good to have too few or too many correspondences.

Note that the term "equivalent" here is not equivalent in the strict sense, but is a concept that includes a tolerance range for a small amount of imbalance.

In order to apply an equal amount of charge, it is necessary to check the required amount in advance in relation to the length of the label, peeling speed, etc.

Next, the electrostatic voltage may be applied to either before or during the peeling process.

If the voltage is applied before peeling, only the applied charge will initially exist on the release sheet, and then it will be neutralized with the peeling charge in the peeling stage.

Furthermore, if the voltage is applied during the peeling process, the peeling charge generated by peeling will be neutralized by the applied charge.

In addition, when Disbenserve L--1-2 is made of metal, if the brush 9 that comes into contact with the adhesive label 4 is connected to the dispenser plate with a conductive wire, the above-mentioned material can be attached to the back side of the release sheet. There is no need for such brushes to be in contact.

Just by having the release sheet in contact with the dispenser plate, the same effect as if it were in contact with the brush can be obtained.

Thus, according to the present invention, the problem of charge accumulation, which hitherto had been difficult due to the charge accumulated at the peeling end, is eliminated, and the peelability is improved because peelability can be peeled in the same state at the starting end and the end. The adhesive label thus prepared is always normally supplied to the suction cup 7 of the air box 6 and is accurately affixed to a predetermined position on the article.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the state in which electric charges are accumulated in the peeling end region while the adhesive label is being peeled off from the release sheet, and FIG. 2 is a schematic diagram of an air jet type autolabeler. , FIG. 3 is an enlarged view of the vicinity of the dispenser plate portion of the autolabeler.

Claims (1)

[Claims] 1. Before or during the peeling process of the adhesive sheet, a conductive substance is brought into contact with the surface of the adhesive label and the back surface of the release sheet, and an opposite electrostatic voltage is applied to neutralize the peeling charge using both surfaces as electrodes. How to label adhesive sheets.