JPH09221118A - Label sticking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a label from floating due to residence of air and improve adhesive strength of the label by providing a process for temporarily sticking the label previously when it is to be stuck to an adhered and thereafter providing further a process for pressing the label which activates a heat sensitive adhesive layer so as to push out the air to the outside even when the air is being in the inside of the label. SOLUTION: In this label sticking method, a label 3 formed of a heat sensitive layer 2 arranged on a synthetic resin film base material 1a is stuck to an article to be stuck 15. There are provided a first heating process which heats the heat sensitive adhesive layer 2 to an extent that its surface has a slight viscosity, a process for temporarily sticking the label 3 to the article to be stuck 15 through the heated heat sensitive adhesive layer 2, and a second heating process for pressing the temporarily stuck label 3 from one part to other part by a heated heat roller 18 for further activating the heat sensitive adhesive layer 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label sticking method most suitable for sticking a label to a container such as a PET bottle.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIG. 7, a label 31 may be attached to a container 30 via a heat-sensitive adhesive layer 32. As a method of attaching the label 31 to the container 30, for example, , The heat-sensitive adhesive layer 32 on one surface is formed into a label 31 by cutting the film coated in a flat shape to a predetermined length, so that the label 31 becomes the surface of the heat-sensitive adhesive layer 32,
Adsorb with a suction drum. Then, after the heat-sensitive adhesive layer 32 is heated and activated at once by the hot air of the heater arranged near the suction drum, the label is rotated together with the suction drum.
The label 31 is attached to the surface of the container 30 by pressing the container 31 on the surface thereof.

[0003]

However, in the conventional label sticking method, the label 31 is strongly pressed against the container 30 in one step after the heat-sensitive adhesive layer is heated and activated all at once, and the label is strongly pressed. When air enters between the container 31 and the container 30 (hereinafter, referred to as the label 31), the air 33 may accumulate in the label 31, causing the label 31 to float or even become wrinkled.

Therefore, even if the label 31 is reheated and repressurized, it is difficult to let the air out of the label 31 because the label 31 is once firmly pressed.
It is not possible to eliminate the float of 31. Moreover, label 31
If there is a floating part on the label, the adhesive strength will decrease and the label 31
Could peel off from that part.

The present invention has been made in view of the above-mentioned conventional problems, and in the case of attaching a label to an article to be attached, a step of temporarily attaching the label in advance and then a heat-sensitive adhesive layer By providing a plurality of steps with the step of pressing the activated label, even if air is present in the label, such air is pushed out to the outside to prevent the label from rising due to an air pool, and The object is to improve the adhesive strength.

[0006]

Means for Solving the Problems The technical means taken by the present invention to solve the above-mentioned problems is to attach a label 3 having a heat-sensitive adhesive layer 2 provided on a synthetic resin film substrate 1a to an adhesive layer. In the method for attaching a label to be attached to an article 15, a first heating step of heating the heat-sensitive adhesive layer 2 to such an extent that the surface thereof has a slight tackiness, and a label 3 via the heated heat-sensitive adhesive layer 2 The step of temporarily adhering the heat-sensitive adhesive layer 2 to the article 15 to be adhered, and the heat rollers 18 and 22 heated to further activate the heat-sensitive adhesive layer 2.
Therefore, the second heating step of pressing the temporarily attached label 3 from one side to the other side is provided.

In the first heating step, it is preferable to heat the label 3 held on the suction drum 7 so that the heat-sensitive adhesive layer 2 is on the surface from the outside.

Further, in the label sticking method for sticking the label 3 having the heat-sensitive adhesive layer 2 provided on the synthetic resin film substrate 1a to the article 15 to be stuck, the surface having an uneven surface is formed. A step of heating and activating the heat-sensitive adhesive layer 2,
The convex portion 2a of the activated heat-sensitive adhesive layer 2 is temporarily adhered to the article 15 to be adhered, and air can flow to the outside between the recess 2b of the heat-sensitive adhesive layer 2 and the surface of the article 15 to be adhered. It is provided with a step of forming a special flow passage 25 and a step of sticking the entire surface of the heat-sensitive adhesive layer 2 by pressing the surface of the label 3.

Moreover, the step of sticking the entire surface of the heat-sensitive adhesive layer 2 by pressing the surface of the label 3 comprises
This is because the surface of the label 3 is pressed by the pressing roller 26 from one side to the other side.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIGS. 1 to 3 show a first embodiment of the present invention, in which 1 is, for example, a product name or the like printed, and a heat-sensitive adhesive layer 2 is formed on the entire surface of one side.
Is a continuous label for heat-sensitive labels, which is composed of a long polyester film base material 1a applied in a flat shape and can be fed out by a feed roller (not shown). The heat-sensitive adhesive layer 2 is not particularly limited, but a hot-melt adhesive layer that is activated by heating to exhibit tackiness is preferable.

Reference numeral 4 denotes a cutting unit for cutting and forming the continuous label 1 of the thermosensitive label into individual labels 3 having a predetermined size. A rotary cutter blade 6 is made to face a roller 5 capable of adsorbing and holding the label 3 by vacuum suction. It is provided.

Reference numeral 7 is a label suction drum which has a rotation center shaft 11 set vertically and is rotatably driven in the direction of the arrow. The outer peripheral surface of the label suction drum 7 is labeled from the cutting unit 4 as shown in FIG. A suction hole 8 is formed for receiving 3 by vacuum suction and holding it by suction. The suction hole 8 is connected to a vacuum device (not shown).

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 7 from the outside. The heating device 12 may be, for example, a near-infrared heater having a halogen lamp having a tungsten filament as a heating element, or a device that blows out hot air, and heats only the substantially surface portion of the heat-sensitive adhesive layer 2. The amount of heat is set so that it can be activated.

A reference numeral 13 designates a conveying device for conveying and supplying a container 15 such as a synthetic resin bottle as a label-adhered article to the label suction drum 7 at a constant interval.
A plurality of jigs 16 having 21b are provided. The upper and lower clampers 21a and 21b of each jig 16 hold the container 15 in a vertically releasable manner and convey the container 15 in the outer peripheral side surface direction of the label suction drum 7. When the upper and lower clampers 21a and 21b sandwich the container 15, the upper clamper 21a presses the mouth 15a of the container 15 to seal it.

Reference numeral 17 denotes a pressing roller for sequentially pressing the label 3 temporarily adhering to the container 15 from one side and pushing out the air in the label 3, which is provided at a position downstream of the suction drum 7.

Reference numeral 18 denotes a heat roller which is driven and rotated about a vertical rotation shaft 19 in the same direction as the label suction drum 7 (direction of arrow a), and is provided downstream of the label suction drum 7. The surface of the heat roller 18 is heated by a heating device 24 having the same structure as that of the heating device 12, and the container 15 to which the label 3 is temporarily attached is moved by the jig 16. As it is transported, FIG.
As shown in (b), the heat roller 18 rolls from one side to the other side while pressing the label 3. The heat roller 18 has a sufficient amount of heat so that the heat roller 18 can activate the entire heat-sensitive adhesive layer 2 of the label 3. The heating device 24 may be built in the heat roller 18 and heat the heat roller 18 from the inside.

Next, a method of attaching the label 3 to the container 15 using the labeling device having the above-mentioned structure will be described. First, the label 3 obtained by cutting the thermosensitive label continuum 1 into a predetermined length by the cutting unit 4 is adsorbed and held on the outer peripheral surface of the label adsorbing drum 7 so that the thermosensitive adhesive layer 2 is on the surface. Rotate and transport.

When the label 3 reaches the front of the heating device 12, the heating device 12 slightly activates the surface of the heat-sensitive adhesive layer 2 to cause tackiness (first heating step). Here, when the heat-sensitive adhesive layer 2 is slightly activated, the entire surface of the heat-sensitive adhesive layer 2 is not activated, but a mottled weak adhesion in which an activated surface and a non-activated surface are mixed. It is preferably adapted to have power.

On the other hand, the container 15 is conveyed toward the label suction drum 7 by the conveying device 13, and the container 15 comes into contact with one side 3a of the label 3 which rotates together with the label suction drum 7. Since the surface of the heat-sensitive adhesive layer 2 is activated and exhibits weak adhesiveness, the label 3 is temporarily attached to the container 15 temporarily.

When the container 15 is conveyed by the jig 16, the pressing roller 17 sequentially rolls from one side 3a of the label 3 temporarily attached to the container 15 toward the other side 3b. At this time, since the heat-sensitive adhesive layer 2 of the label 3 has a non-adhesive portion that is not activated and a weak adhesive portion that is easily peeled off, the air in the label 3 is not applied as the pressure roller 17 moves. By peeling off the adhesive portion and the weakly adhesive portion, they pass and are easily pushed out from the other side 3b of the label 3 to the outside.

Further, the container 15 to which the label 3 is temporarily attached is
It is supplied to the heat roller 18. At this time, the heated heat-sensitive adhesive layer 2 is not yet cured and is in a slightly activated state.

Since the surface of the heat roller 18 is heated by the heating device 24, when one side 3a of the label 3 together with the container 15 is pressed against the heat roller 18, the heat roller 18 passes through the film substrate 1a. The heat-sensitive adhesive layer 2 is sufficiently heated to be fully activated (see FIG. 1A).

Further, since the heat roller 18 is rotating in the direction of arrow a, the heat roller 18 rolls on the label 3 conveyed in the same direction as the heat roller 25 from one side 3a to the other side 3b.
The heat-sensitive adhesive layer 2 is sequentially activated and the label 3
Is firmly pressed against the container 15 as shown in FIGS. 1B and 1C (second heating step).

Accordingly, the heat roller 18 moves on the label 3 while it is 3a.
Even when air that could not be discharged by the pressing roller 17 remains inside the label 3 when rolling toward the other side 3b from the heat roller 18, the heat roller 18 sequentially moves the label 3 from the one side 3a to the other side. Since the air in the label 3 is pushed toward the 3b, the air inside the label 3 is pushed out to the outside from the other side of the label 3 which is weakly adhesive as the heat roller 18 moves, and the air does not remain in the label 3 as bubbles. , The entire surface of the label 3 adheres to the surface of the container 15.

When the heat roller 18 rolls on the label 3, the upper clamper 21a presses the mouth 15a of the container 15 as shown in FIG. Therefore, the air sealed in the container 15 allows the container 15 to have elasticity, and is particularly effective when the container 15 is a thin synthetic resin bottle.

The container 15 having the label 3 attached on the surface thereof is conveyed by the belt conveyor 16 to the next packaging process or the like.

Second Embodiment FIG. 4 shows a second embodiment of the present invention, in which both sides of the container 15 are releasably clamped by a pair of clampers 20 swinging in an arc shape. Further, the heat roller is a small-diameter iron roller 22.
The iron roller 22 has a built-in heater so that it can be heated. Further, the iron roller 22
A sponge roller 23 is provided at the downstream position of.
Further, the suction drum 7 is heated by the heating device 12 in the same manner as described above.

When the label 3 is attached to the container 15 with the above structure, the label 3 adsorbed on the label adsorbing drum 7 is held by the clamper 20 and moved in the direction of arrow b in the same manner as described above. On the other hand, it is temporarily adhered to the surface from 3a.

Immediately before or immediately after the other side 3b of the label 3 is temporarily adhered to the container 15, the iron roller 22 presses one side 3a of the label 3, but the iron roller 22 is heated. Therefore, the heat-sensitive adhesive layer 2 of the label 3 can be further heated to be completely activated.

Therefore, when the container 15 moves in the direction of the arrow b in an arc shape, the iron roller 22 rolls and the label 3 is placed on the container.
The pressure is sequentially applied to 15 from one side 3a to the other side 3b, and the label 3 is attached to the container 15 without bubbles remaining.

When the container 20 is moved by the clamper 20, the label 3 attached to the container 15 is pressed against the sponge roller 23 from the side 3a. As the container 15 moves, the sponge roller 23 presses the label 3 while rotating, so that the label 3 is more reliably attached to the container 15.

Third Embodiment FIGS. 5 and 6 show a third embodiment of the present invention. As shown in FIG. 6, the heat-sensitive adhesive layer 2 of the label 3 has a convex portion 2a in the longitudinal direction of the label 3. A plurality of columns are provided so as to have a predetermined interval in two rows. The thickness (step, height) of the convex portion 2a is 2 to 30.
It is preferably about μm.

When the label 3 is attached to the container 15, first, the heat-sensitive adhesive layer 2 is heated by a heating device (not shown) to fully activate the whole. Next, the label 3 is temporarily attached to the surface of the container 15 via the convex portion 2a of the heat-sensitive adhesive layer 2. At this time, the pressing force applied to the heat-sensitive adhesive layer 2 is weak, and the flat surface portion (corresponding to the concave portion) 2b is separated from the surface of the container 15 so as not to be bonded. Therefore, here
A flow passage 25 is formed between the label 3 and the surface of the container 15 so as to communicate with the longitudinal direction of the label 3 (one direction to the other direction) and open to the outside.

In this state, as shown in FIG. 5A, a pressure roller 26 longer than the width of the label 3 (direction orthogonal to the longitudinal direction) is arranged on one side of the label 3, and the pressure roller 26 is disposed.
While pressing the label 3 with 26, the pressing roller 26 rolls to the other side of the label 3 (see (B) in the figure).

By the rolling of the pressing roller 26, the convex portion 2a of the softened heat-sensitive adhesive layer 2 is crushed, and the flat portion 2b is crushed.
Although it is adhered to the surface of the label 15, the air in the label 3 is pushed out to the other side of the label 3 through the flow passage 25 as the pressure roller 26 moves, and the pressure roller 26 is attached to the label 3.
On the other hand, by rolling to the other side 3b, no air remains in the label 3 and the whole is adhered and completely adhered (Fig. 3C).

The label 3 according to the present embodiment is used as a container.
As the means for temporarily adhering to 15, it is preferable to adopt the suction drum 7 exemplified in the first and second embodiments, but in such a case, the suction drum 7 is the label 3
The pressing force for pressing is required to be set smaller than the force for pressing the label 3 by the pressing roller 26 so that the convex portion 2a is not crushed during the temporary adhesion.

Further, the pressing roller 26 keeps the label 3 at room temperature.
Instead of pressing, the label 3 may be pressed in a heated state. In this case, the heat-sensitive adhesive layer 2 can be activated more efficiently. Moreover, the convex portion 2a may be a continuous one provided with a plurality of lines from one side 3a of the label 3 toward the other side.

The present invention is not limited to the first to third embodiments described above. For example, the container 15 may have a circular cross section other than an elliptical shape. In this case, the heat roller is used. 18 and 22 may be configured to rotate the container 15 on its own axis.

[0039]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the first heating step of heating the heat-sensitive adhesive layer to such an extent that the surface thereof is slightly tacky, and the label is adhered via the heated heat-sensitive adhesive layer. Since there is a step of temporarily adhering to the article and a second heating step of pressing the temporarily adhered label from one side to the other with a heating roller heated to further activate the heat-sensitive adhesive layer, air is temporarily put in the label. Even when the label contains, it becomes possible to adhere the label to the article to be adhered while extruding the air in the second heating step, and prevent the label from rising or wrinkling due to the accumulation of air, and the label. It is possible to improve the adhesive strength of the label without the risk of the label peeling due to the lifting of the label.

In addition, a step of heating and activating the heat-sensitive adhesive layer having an uneven surface, and the convex portion of the activated heat-sensitive adhesive layer being temporarily adhered to the article to be adhered, the heat-sensitive adhesive layer A step of forming a flow passage through which air can flow to the outside between the concave portion of the adhesive layer and the surface of the article to be adhered, and a step of sticking the entire surface of the heat-sensitive adhesive layer by pressing the label. Since, when the label is pressed, the air in the label can be effectively discharged to the outside through the flow passage, and similarly to the above, it is possible to prevent the label from rising and improve the adhesive strength of the label. It will be possible.

Moreover, when the step of sticking the entire surface of the heat-sensitive adhesive layer by pressing the surface of the label is to press the surface of the label from one side to the other side by the pressing roller. Has an advantage that the label can be reliably attached to the article to be attached with a simple configuration.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, in which (a) is a cross-sectional plan view of a state in which one side of a label is pressed by a heat roller,
(B) is a cross-sectional plan view of the state in which the middle part of the label is pressed,
(C) is a cross-sectional plan view of a state in which the other side of the label is pressed.

FIG. 2 is a plan view showing an outline of the labeling device.

FIG. 3A is a cross-sectional view showing a state where the label attached to the suction drum is temporarily attached to the container, and FIG. 3B is a cross-sectional view showing a state where the heat roller presses the label against the container.

FIG. 4 is a plan view showing the outline of a labeling device showing a second embodiment of the present invention.

FIG. 5 shows a third embodiment of the present invention, in which (a) is a cross-sectional plan view in which one of the labels is pressed by a roller, (b).
Is a cross-sectional plan view showing a state in which the middle part of the label is pressed, (C)
Is a cross-sectional plan view showing a state in which the other side of the label is pressed.

FIG. 6 shows the same label, (a) is a sectional front view, (b)
Is a rear view.

FIG. 7 shows a conventional example, (a) is a perspective view of a container to which a label is attached, and (b) is an enlarged plan view of the same section.

[Explanation of symbols]

1a ... Synthetic resin film base material, 2 ... Heat-sensitive adhesive layer, 2a ... Convex part, 2b ... Flat part (concave part), 3 ... Label, 7 ... Label suction drum, 15 ... Container (adhered article), 18, 22 ... heat roller,
25 ... flow passage, 26 ... pressing roller

Claims (4)

[Claims] 1. A label sticking method for sticking a label (3) comprising a heat-sensitive adhesive layer (2) provided on a synthetic resin film substrate (1a) to an article to be stuck (15), A first heating step of heating the heat-sensitive adhesive layer (2) to such an extent that the surface thereof is slightly tacky, and the heated heat-sensitive adhesive layer (2)
Temporarily pasting the label (3) onto the article (15) to be pasted via the heat roller (18) and (22) heated to further activate the heat-sensitive adhesive layer (2). A method for attaching a label, comprising a second heating step of pressing the attached label (3) from one side to the other. 2. The heat-sensitive adhesive layer (2) in the first heating step.
The label sticking method according to claim 1, wherein the label (3) held by the suction drum (7) so that the surface of the label is heated from the outside. 3. A label sticking method for sticking a label (3) comprising a heat-sensitive adhesive layer (2) provided on a synthetic resin film substrate (1a) to an article to be stuck (15), the method comprising: A step of heating the heat-sensitive adhesive layer (2) having irregularities to activate it, and the convex portion (2a) of the activated heat-sensitive adhesive layer (2) to the adherend article (15) A step of adhering to form a flow passage (25) through which air can flow to the outside between the concave portion (2b) of the heat-sensitive adhesive layer (2) and the surface of the article to be adhered (15); A step of sticking the whole surface of the heat-sensitive adhesive layer (2) by pressing (3), the sticking method of the label. 4. The step of sticking the entire surface of the heat-sensitive adhesive layer (2) by pressing the surface of the label (3), the surface of the label (3) is pressed from one side by a pressing roller (26). The method of sticking a label according to claim 3, wherein the method is performed by pressing the label toward the other side.