JPH0139953B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is a heat-shrinkable label that automatically cuts and removes a label made of a heat-shrinkable film set in a bottle without manual intervention. The present invention relates to a method for peeling off a label made of a sex film.

<Prior art> When a used bottle is reused, a label made of a heat-shrinkable film set on a bottle is peeled off and the bottle surface is cleaned before the bottle is reused. The conventional method for peeling off labels was to use a knife or the like. However, in recent years, the surface of many bottles has been coated with synthetic resin to prevent them from bursting and scattering, and there are problems such as scratches on the surface when a knife is applied to a coated bottle.
Some kind of countermeasure was needed. Furthermore, troubles such as breakage of the cutter occurred for ordinary bottles that were not coated, and there were problems in peeling off the coating using a cutter.

Furthermore, cutting thermoplastic films by the action of heat has traditionally been carried out in the cutting process in the textile sector, but this method does not involve cutting only the label from the packaged object such as a bottle and peeling it off. Rather, it was simply used for cutting.

<Means for Solving the Problems> The present invention has been made in view of the current situation, and provides a method of peeling a label made of a heat-shrinkable film from a used bottle with an extremely simple structure and without using a knife. The feature is that hot air is blown from outside the bottle in the axial direction of the bottle using a nozzle having narrow grooves onto a label made of a heat-shrinkable film set on a bottle.
The aim is to cut the heat-shrinkable film at the sprayed portion and then peel it off using the heat-shrinkability of the label using a heating medium.

Examples of bottles used in the present invention include those coated with a synthetic resin or the like to prevent them from bursting and scattering, and those made of ordinary glass. A label made of a heat-shrinkable film is a label made of a heat-shrinkable film made of plastic such as polyvinyl chloride or polypropylene.
Usually, it is provided in a band shape so as to surround the periphery of the bottle, for example as shown in FIG. The part of the label to be cut can be anywhere on the label, but if hot air is blown onto this part, that part will melt. To blow hot air, for example, a nozzle 3 having a narrow groove is provided in the axial direction of the bottle as shown in FIGS. As shown in the figure, the spray is applied from the outside of the bottle in the axial direction of the bottle, and the label made of the heat-shrinkable film in the sprayed area is fused and cut into a generally linear shape in the axial direction. In this case, it is more preferable that the nozzle is curved as necessary to match the shape of the bottle. In this case, the label tends to shrink due to the action of the hot air ejected from the nozzle 3 having a narrow groove, that is, the nozzle 3 having a slit-like outlet, and then the label is cut in the axial direction by the wind pressure.

In the present invention, the cut labels are peeled off using the thermal shrinkage properties of the labels using a heat medium. For example, when the cut labels are further applied with heat to the extent that the labels shrink, the labels shrink. The cut surface gradually widens, becomes smaller, and eventually peels off from the bottle. The current situation is shown in Figure 3, and the label will now be automatically peeled off from the bottle. At this time, in order to apply heat to the extent that the label shrinks, the label may be passed through a shrink tunnel, for example, but any other suitable method may be used.

Next, specific examples of the present invention will be described with reference to FIGS. 5 and 6, but it goes without saying that the present invention is not limited to the specific examples.

In the concrete example of cutting, first, empty bottles 1 with labels set thereon are continuously conveyed by a conveyor 9, are spaced at regular intervals by a screw 10, are sent to a rotating turret 11 by a star wheel 12, and then are sent to a rotating turret 11. The empty bottle 1 sent to the bottle mounting table 14 is fixed by a vertically movable bottle upper fixture 7 installed around the entire periphery of the turret 11, and hot air having narrow width grooves installed around the turret 11 is fixed. Only the label 2 of the empty bottle 1 is fused and cut by the hot air directed in the axial direction of the bottle from the spray nozzle 3.
Thereafter, the label shrinks using its own heat-shrinkability due to the action of the heat medium of the hot air, peels off from the bottle, and is blown away by the wind pressure of the hot air jetted from the hot air blowing nozzle 3 and separated from the bottle. There is. The labels 2 thus cut, peeled off, and blown fall to the lower part of the enclosure 4 surrounding the upper part, outer periphery, and lower part of the turret 11, and are sucked up by a blower and collected by the collecting duct 5 disposed at the lower part. If the label 2 remains on the bottle, it may be completely removed using the rotating brush 6. The bottle 1 from which the label has been cut and peeled in this way passes through the star foil 13 and is conveyed to the next process by the conveyor 9. At this time, any other suitable method can be used to peel off the cut label using a heat medium and utilizing the heat shrinkability of the label.

Next, examples of the present invention will be described below.

Example 1 Using the apparatus shown in Figures 5 and 6, the following conditions were used to cut used labels from a bottle set with heat-shrink labels made of polyvinyl chloride and printed on the entire back side. I made the settings.

Hot air outlet temperature: 230℃ Width of the nozzle consisting of slit grooves: 0.5mm Hot air speed: 82m/sec Distance between the hot air outlet and the bottle: 2.5mm (constant) When the cutting conditions were tested under the above conditions, it was found that the cutter was not set in the bottle. The heat-shrinkable label is cut instantly (0.5 seconds), and then the label uses its own heat-shrinkable properties to shrink and peel off from the bottle due to the action of the heat medium from the hot air, and is further blown away by the wind pressure. separated from the bottle. Note that it took about 1 second at a temperature of 210°C.

Example 2 A heat-shrinkable label made of styrene-butadiene block copolymer was tested under the same conditions as in Example 1 except for the hot air blowing temperature of 200°C. The label was then cut by the heat medium generated by the hot air, and the label used its own heat shrinkability to shrink and peel off from the bottle, and was further blown away by the pressure of the wind. When the temperature was set to 180°C, it took about 1 second.

<Effects of the Invention> The present invention provides a method for automatically cutting a label made of a heat-shrinkable film set in a used bottle without any manual intervention, and then peeling it off by utilizing the heat-shrinkability of the label. As a result, the bottle with the label made of the heat-shrinkable film can be reused extremely easily.

Moreover, even when using a bottle whose surface is coated with synthetic resin, which is commonly used in the past,
It is excellent because it provides special effects such as not damaging the coating surface.

[Brief explanation of drawings]

FIG. 1 is a front view of a bottle with a label made of heat-shrinkable film set, FIG. 2 is a front view showing hot air being blown from a hot air blowing nozzle having narrow grooves, and FIG. The figure is a front view showing the state in which the label has been heat-shrinked and removed from the bottle, Figure 4 is a sectional view from above showing the label being removed from the bottle by blowing air, and Figure 5 is a sectional view showing the state in which the label is removed from the bottle by blowing air. FIG. 6 is a perspective view showing an example of a label peeling device, and FIG. 6 is a plan view thereof. 1... Bottle, 2... Label made of heat shrink film, 3... Hot air blowing nozzle, 4... Enclosure,
6... Rotating brush, 7... Fixture at the top of the bottle (movable up and down), 8... Air blowing nozzle, 1...
Bin with label set, 9...conveyor, 10...screw, 11...turret,
12, 13... Star foil, 14... Turret and bottle mounting stand.

Claims (1)

[Claims] 1. Hot air is blown onto a label made of a heat-shrinkable film set in a bottle from outside the bottle in the axial direction of the bottle using a nozzle having a narrow groove, and the heat-shrinkable film in the blown area is cut. A method for peeling off a label made of a heat-shrinkable film, further comprising peeling off using the heat-shrinkability of the label with a heating medium.