JPH09226734A - Method for attracting label in thermosensitive labeler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a conventional trace of a small hole for vacuum suction from remaining when a label is pasted on a container and reduce a material cost by electrifying the label and having the label attracted to a label attracting drum by attractive force due to electrification. SOLUTION: A successive thermosensitive label body 1 is fed and cut into a predetermined length by a cutting unit 4 to form labels 3. The labels 3 are passed between both electrification rolls 9 to apply electric charge to the labels 3. Then the electrified labels 3 are carried via the electrification rolls 9, a tip side is brought into contact with a label attracting drum 10, and the labels 3 are successively attracted on a peripheral face 10a in a flat state. The label 3 carried by the label attracting drum 10 passes through a heater 12 so that a thermosensitive adhesive layer is activated and can be adhered, and the label is successively wound around a peripheral face of a container 15 which is rotated by contact with the label attracting drum 10 and pasted thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of adsorbing a label on a heat-sensitive labeler which is most suitable for attaching a label to a container using the heat-sensitive labeler.

[0002]

2. Description of the Related Art Conventionally, as a means for attaching a label to a container by using a heat-sensitive labeler, for example, Japanese Patent Laid-Open No. 4-102 is known.
The one described in Japanese Patent No. 538 is known. That is, the means described in the publication grabs the label by the label suction drum by vacuuming so that the heat-sensitive adhesive layer becomes the surface, and the heat-sensitive adhesive layer is attached by the hot air of the heater arranged in the vicinity of the label suction drum. After being heated and activated, the label conveyed to the label suction drum is attached to the surface of the container.

[0003]

However, the above-mentioned conventional means for holding the label on the label suction drum is provided with a large number of small holes for evacuation on the surface of the label suction drum.
The label is adsorbed on the surface of the label adsorption drum through the small hole. Therefore, when a coating layer such as a heat-sensitive adhesive layer is provided on the surface of the label, a small hole mark of the label suction drum is formed on the label when the label is sucked, and even when the label is attached to the container. There was a problem that the traces of small holes remained. This problem tends to be particularly remarkable when the label is made of a thin film, and as a result, there is a drawback that a thick film is inevitably used and the material cost is increased.

The present invention has been made in view of the above problems of the prior art. Even a thin label can be held by a label suction drum so that small hole marks are not formed.
An object of the present invention is to prevent the trace of small holes from remaining when the label is attached to the container and to reduce the material cost.

[0005]

The technical means taken by the present invention to solve the above problems is that the heat-sensitive adhesive layer 2 is a base material.
In the label adsorption method in a heat-sensitive labeler, in which the label 3 applied to 1a is adsorbed and held on the label adsorption drum 10 and conveyed, the label 3 is electrically charged, and the label 3 is attached to the label adsorption drum 10 by an adsorption force by charging. It is to make it adsorb.

Therefore, the charged label 3 can be adsorbed and held on the label adsorbing drum 10 by utilizing electrostatic induction by static electricity, and it is necessary to form a small hole for vacuuming in the label adsorbing drum 10. Therefore, there is no small hole mark on the label 3. Moreover, since it is not necessary to increase the thickness of the label so as not to form the traces of small holes, and a thin label can be adopted, the material cost is low.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention, in which 1 is a long polyester film substrate 1a on which, for example, a trade name or the like is printed, and a heat-sensitive adhesive layer 2 is applied to the entire one surface. The heat-sensitive label continuous body can be fed out by a feed roller (not shown). The heat-sensitive adhesive layer 2 is not particularly limited, but an adhesive layer such as hot melt that is activated by heating to exhibit tackiness is suitable.

Reference numeral 4 is a cutting unit for cutting and forming the continuous label 1 of the thermosensitive label into individual labels 3 having a predetermined size.

Reference numeral 7 denotes a charging device arranged at a position downstream of the cutting unit 4. The charging device 7 charges a pair of charging rolls 9 holding the thermosensitive label continuous body 1, and the electric charge is continuously applied to the thermosensitive label. The body 1 is designed to be tinged.

Reference numeral 10 is a metal label suction drum provided with a rotation center shaft 11 set vertically and rotatably driven in the direction of the arrow, and a peripheral surface 10a thereof is provided with a small hole for vacuuming at all. There is no smooth surface.

Reference numeral 12 is a heating device for heating the heat-sensitive adhesive layer 2 of the label 3 adsorbed on the label adsorbing drum 10 from the outside. As the heating device 12, for example, a device having a halogen lamp having a tungsten filament as a heating element incorporated therein as a near-infrared heater, or a device which blows out hot air can be adopted.

13 is a synthetic resin bottle as an article to be adhered,
The container 15 such as a glass bottle or a metal can is attached to the label suction drum.
A conveyor device for conveying and supplying to the container 10 at regular intervals divides a large number of containers 15 conveyed by the belt conveyor 16 and the screw conveyor 16a by the star wheel 17 and conveys them in the outer peripheral side surface direction of the label adsorption drum 10.

The embodiment of the present invention has the above-mentioned structure, and the method thereof will be described below. First, when the continuous label 1 is fed, the continuous label 1 is cut into a predetermined length by the cutting unit 4 to form the label 3. Further, the label 3 passes between both charging rolls 9, but since the charging device 7 charges the roll 9, the charge of the charging roll 9 is charged to the label 3, and therefore,
The label 3 will be charged.

Further, the charged label 3 is conveyed through the charging roll 9, and the leading end side comes into contact with the label suction drum 10. At this time, electrostatic induction is generated in the label suction drum 10, and the charge of the label 3 is charged. The opposite charges are induced and attracted to each other, and the label 3 is sequentially adsorbed on the peripheral surface 10a of the label adsorbing drum 10 (see FIGS. 2A and 2B).

Since the peripheral surface 10a of the label suction drum 10 is a smooth surface without any small holes for vacuuming as in the conventional case, the label 3 sucked on the label suction drum 10 has a small hole. Therefore, the surface of the label suction drum 10 is not dented, and a smooth surface is brought into close contact with the surface of the label suction drum 10. Further, the label 3 conveyed by the label suction drum 10 is
When passing through the heating device 12, the heat-sensitive adhesive layer 2 receives hot air or the like from the heating device 12, and the heat-sensitive adhesive layer 2 is activated and becomes in a bondable state.

On the other hand, the container 15 is conveyed toward the label suction drum 10 by the conveying device 13, the container 15 encounters the label 3 rotating with the label suction drum 10, and the container 15 rotates by contact with the label suction drum 10. Label 3 on the circumference
Are sequentially wound and attached.

When the label 3 is wound around the container 15, since the label 3 is in a charged state, not only the adhesive force of the heat-sensitive adhesive layer 2 but also the adsorption force to the container 15 is used. The label 3 can be brought into close contact with the peripheral surface of the container 15.

Then, as shown in FIG. 3, the container 15 on the surface of which the label 3 is attached is conveyed by the belt conveyor 16 to the next packaging process or the like.

In the above embodiment, the label suction drum
Although the heat-sensitive adhesive layer 2 is activated by heating the label 3 held by 10 with the heating device 12, the label 3 may be attached by heating the container 15 side.

The base material of the label 3 is preferably a plastic film which can be easily charged. For example, in the case of polyethylene, polyethylene terephthalate, polypropylene, polyvinyl chloride, etc., the tendency to be negatively charged is strong. Therefore, the surface of the label suction drum is preferably made of a material such as aluminum having a strong positive charging tendency. Furthermore, in the above-mentioned embodiment, the thermal label continuous body 1
The label 3 was charged after the label 3 was cut to form a label 3 having a predetermined length. However, in the state of the heat-sensitive label continuous body 1, the label continuous body 1 may be charged and then cut. good.

[0021]

As described above, according to the present invention, the label is charged, and the label is adsorbed to the label adsorption drum by the adsorption force due to the electrification. It is not necessary to adsorb the label through the holes, and no trace of small holes is formed on the label when the label is adsorbed.

Therefore, when the label conveyed to the label suction drum is attached to the container, no trace of small holes remains, and the appearance can be improved. In particular, as the label becomes thinner, The above effect is exhibited. Moreover, since the label can be attached to the container using the electrostatic attraction,
It is preferable when the adhesive layer is easily attached without activation and is adhered by the heat of the container.

Further, it is not necessary to increase the thickness of the label so as not to form traces of small holes, and since a thin label can be adopted, there is an advantage that the material cost is low.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of the present invention.

FIG. 2A is a vertical cross-sectional view of a main part where a label is adsorbed on a label adsorption drum, and FIG. 2B is a partial cross-sectional plan view showing a state in which the label is supplied from the charging roll to the label adsorption drum.

FIG. 3 is a perspective view of a container to which the label is attached.

[Explanation of symbols]

1a ... label base material, 2 ... heat-sensitive adhesive layer, 3 ... label, 7 ... label suction drum

Claims (1)

[Claims] 1. A method for adsorbing a label in a heat-sensitive labeler, wherein a label (3) comprising a substrate (1a) provided with a thermosensitive adhesive layer (2) is adsorbed and held on a label adsorbing drum (7) and conveyed. A method for adsorbing a label in a heat-sensitive labeler, characterized in that the label (3) is charged and the label (3) is adsorbed on the label adsorbing drum (7) by an adsorbing force due to the electrification.