WO1999067768A1

WO1999067768A1 - Heat-sensitive adhesive label, method of attaching the label, and dry cell attached with the label

Info

Publication number: WO1999067768A1
Application number: PCT/JP1998/002878
Authority: WO
Inventors: Tetsuo Hata; Masakazu Hirayama
Original assignee: Fuji Seal, Inc.
Priority date: 1998-06-25
Filing date: 1998-06-25
Publication date: 1999-12-29
Also published as: EP1124214A1

Abstract

A heat-sensitive adhesive label and a method of attaching the label capable of maintaining a sufficient adhesive force even when a heat-adhesive resin layer is heated at low temperatures. The heat-sensitive adhesive label comprises a label base formed of a polyester film with heat shrinkability, a primer layer and a print layer laminated successively over one surface of this label base, and a metal vapor deposition layer, an anchor coat layer and a heat-adhesive resin layer, laminated successively over the other surface of the label base. During the label attaching process, the heat-adhesive resin layer is subjected to corona discharge and heated to activate the layer, whereby the heat-sensitive adhesive label is attached to a dry cell body, the object for label attaching.

Description

Heat damage label, method of mounting the label, and dry cell with the label

The present invention relates to a heat-sensitive adhesive label to be attached to an article and a method for mounting the label, and particularly to a heat-sensitive adhesive label having excellent adhesiveness and a method for mounting the label. Background art

For example, as a label for an exterior of a dry battery, as disclosed in Japanese Patent Application Laid-Open No. 8-306346, a heat-adhesive resin layer is provided on one side of a label substrate made of a synthetic resin film. Heat-sensitive adhesive labels are used.

Such a heat-sensitive adhesive label does not produce adhesiveness unless the heat-adhesive resin layer is heated, and therefore does not require expensive release paper that is usually used for adhesive labels (tack labels). Since there is no need to peel off the release paper, there is an advantage that it is superior to adhesive labels in terms of material cost and sticking workability.

By the way, in the case of the above-mentioned dry battery in which the article to be mounted is a heat-sensitive adhesive label having a heat-shrinkable property in which the heat-adhesive resin layer is activated by heating, the both sides of the label are made of metal. Wrap around the outer surface of the dry battery main body so as to protrude from both ends of the formed dry battery main body, stick both ends of the heat-sensitive adhesive label to each other so as to overlap each other, and then apply the high temperature again. Heat-shrinks the label itself by heating, and attaches the heat-sensitive adhesive label to the dry battery main body by attaching both sides of the label protruding from both ends of the dry battery main body to the both end surfaces of the dry battery main body. Generally, it is necessary that the heat-adhesive resin layer of the label not only has sufficient adhesive force to the metal surface of the dry cell body, but also sufficient adhesive force at the overlapping portion of the labels.

In particular, if the adhesive strength of the overlapping part of the labels is weak, the label may be inconvenienced when the end of the label that is superimposed on the label is turned up when the label itself is heated or shrunk or when a dry battery is used. It is necessary to secure an adhesive force to the labels so that the labels are firmly adhered to each other.

However, in the conventional heat-sensitive adhesive label, it is not possible to secure a sufficient adhesive strength to the heat-adhesive resin layer only by heating the heat-adhesive resin layer at a low temperature. If the heating temperature is increased, the printed layer formed on the surface of the label substrate is damaged and the appearance becomes poor, or if the label substrate is a synthetic resin film having heat shrinkage as described above. However, there is a problem when the label base material shrinks during activation of the heat-adhesive resin layer to cause distortion or wrinkles.

Furthermore, when the heating temperature at the time of activating the heat-adhesive resin layer is increased, the energy supplied to the heating means, such as a heater, is increased, and the running cost of the label mounting device is increased. is there.

Therefore, an object of the present invention is to provide a heat-sensitive adhesive label which can secure a sufficient adhesive force even when the heat-adhesive resin layer is heated at a low temperature, and a method for mounting the label. Disclosure of the invention

In order to achieve the above object, the present invention provides a thermosensitive adhesive label having a thermoadhesive resin layer formed on a label substrate, wherein the thermoadhesive resin layer is subjected to corona discharge treatment. In the heat-sensitive adhesive label configured as described above, the heat-adhesive resin layer formed on one side of the label substrate is subjected to corona discharge treatment. Can secure sufficient adhesive strength even if heated by heating for not only the adhesion to the metal surface but also the adhesion between the labels (ultraviolet-curable ink surface, polyester film surface, etc.). In addition to this, the running cost of the label mounting device can be reduced.

In particular, in the case where the heat-adhesive resin layer is formed of an ethylene acrylic acid copolymer, an ethylene methacrylic acid copolymer, an ethylene acrylate copolymer or an ethylene methacrylate copolymer. Thus, the adhesive strength of the heat-adhesive resin layer during low-temperature heating can be further increased.

Further, as described above, if the heat-adhesive resin layer is subjected to corona discharge treatment, the heat-adhesive resin layer can be activated at a low temperature. In the case where the label is formed of a film, the difference between the heating temperature at the time of heat shrinking and the activation temperature of the thermo-adhesive resin layer can be made large. Distortion due to shrinkage can be suppressed.

Further, when the above-mentioned heat-sensitive adhesive label is mounted on the article to be mounted, in the mounting process, after performing the corona discharge treatment on the thermo-adhesive resin layer, the heat-adhesive resin layer is heated. Activating the heat-adhesive resin layer to attach the heat-sensitive adhesive label to an article to be mounted may be performed, for example, by storing a long heat-sensitive adhesive label in a rolled state. In addition, there is no inconvenience of causing blocking due to surface contact between the labels, and there is an effect that handling of the heat-sensitive adhesive label becomes easy. In particular, when the heat-sensitive adhesive label is attached to the outer peripheral surface of a columnar or cylindrical article to be mounted, the heat-sensitive adhesive label having the heat-adhesive resin layer activated is applied to the entire circumference of the article to be mounted. It is preferable that the heat-sensitive adhesive label is wound on the object to be mounted such that both ends of the heat-sensitive adhesive label overlap each other.

In the case where the article to be mounted is a dry battery main body whose surface is formed of metal, the label base is formed of a heat-shrinkable synthetic resin film, and the heat-adhesive resin layer is formed of ethylene acrylic acid. Using a heat-sensitive adhesive label formed of a copolymer, an ethylene methacrylate copolymer, an ethylene acrylate copolymer or an ethylene methacrylate ester, the following method is used. It is desirable to attach it to the battery itself.

First, as described above, after performing the corona discharge treatment on the heat-adhesive resin layer, the heat-sensitive adhesive label activated by heating the heat-adhesive resin layer is heated. And wound around the outer peripheral surface of the dry battery main body so as to protrude from both ends of the dry battery main body formed at the same time, and affixed to the dry battery main body such that both end portions of the heat-sensitive adhesive label overlap each other. . Then, the heat-sensitive adhesive label attached to the dry battery main body is heated again to thermally shrink the relabel base material, and both sides of the heat-sensitive adhesive label protruding from both ends of the dry battery main body are removed. When the thermosensitive adhesive label is brought into close contact with both end surfaces of the dry battery main body, the thermosensitive adhesive label can be securely attached to the dry battery main body. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional view showing a preferred embodiment of a heat-sensitive adhesive label according to the present invention, FIG. 2 is a sectional view showing another preferred embodiment of the heat-sensitive adhesive label, and FIG. Schematic showing the mounting device for the heat-sensitive adhesive label in the figure FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

As shown in FIG. 1, the heat-sensitive adhesive label 1 is a label for the exterior of a dry battery, and is formed of a heat-shrinkable polyester film (for example, a polyethylene terephthalate film). Label substrate 11, a primer layer 12 and a printed layer 13 sequentially laminated on one surface side of the label substrate 11, and a metal sequentially laminated on the other surface side of the label substrate 11 It is composed of a vapor deposition layer 14, an anchor coat layer 15 and a thermo-adhesive resin layer 16.

The label base material 1 has a thickness of 30 / im to 60 μm, and has a heat shrinkage of 1% or less at 70 ° C. and 20% or more at 130 ° C. In addition, as the label substrate 11 of the battery exterior label, when the thickness is in the range of 20 / m to 100 Wm, the shrinkage in the circumferential direction of the dry battery is 20% or more, and the heat shrinkage is 70 °. There is no particular problem if C is within 3%.

The label substrate 11 is preferably formed of a polyester film (polyethylene terephthalate film). For example, the label substrate 11 may be formed of a polyvinyl chloride or polyolefin-based film.

The printing layer 13 is formed by printing various display designs or the like using an ultraviolet curable ink having better heat resistance than a normal solvent drying ink. UV curable varnish is coated for protection and gloss. The UV-curable ink includes oligomers such as epoxy acrylate, urethane acrylate, and polyester acrylate, and polyesters containing a colorant such as a UV polymerization initiator and a pigment, a dispersant, and an additive. It is a mixture of monomers, specifically, “Best Cure I” by Toka Shigaku Chemical Co., Ltd., “UVACE” by Inku Kuboi Co., Ltd., and “CP—UV” by Matsuikagaku Co., Ltd. And the like.

The primer layer 12 is provided for improving the adhesiveness of the printing layer 13 to the label substrate 11, and is not necessarily provided.

The metal-deposited layer 14 is formed by vacuum-depositing aluminum on the other side of the label substrate 11 and has a thickness of 200 to 800 A. . The metal deposition layer 14 is not limited to aluminum, and may be, for example, nickel or tin vacuum-deposited.

The heat-adhesive resin layer 16 is formed by melt-extruding an ethylene acrylic acid copolymer or an ethylene methacrylic acid copolymer onto the anchor coat layer 15 on the other side of the label base material 11. The heat-adhesive resin layer 16 is subjected to a corona discharge treatment in order to improve the adhesiveness. The thus formed heat-adhesive resin layer 16 has excellent adhesiveness to metal and the printed layer 13 and has a preferable property as a heat-adhesive resin layer of an exterior label of a dry battery. ing.

As the material for forming the heat-adhesive resin layer 16, it is preferable to use an ethylene copolymer which significantly improves adhesion by corona discharge treatment. In addition to ethylene methacrylic acid copolymer, ethylene ethyl acrylate, ethylene 2-ethyl ester Suitable are ethylene acrylate copolymers such as hexyl and ethylene methacrylate copolymers such as ethylene ethyl methacrylate. Further, ionomer resins and ethylene vinyl acetate copolymers may also be used. In addition, the heat-adhesive resin layer 16 may be a layer obtained by mixing these resins and appropriately adding a tackifier, a stabilizer, a modifier, and the like. Further, as a method of forming the heat-adhesive resin layer 16, in order to efficiently form the heat-adhesive resin layer 16 in a relatively thick and uniform thickness, the above-described melt extrusion coating is used. Desirably, the resin may be applied in a solution state.

The anchor coat layer 5 is provided for improving the adhesiveness of the heat-adhesive resin layer 16 to the metal vapor-deposited layer 14 and is not necessarily provided.

In the thermosensitive adhesive label 1 configured as described above, since the thermoadhesive resin layer 16 is subjected to corona discharge treatment, when the thermoadhesive resin layer 16 is activated, it is heated at a low temperature. Also, the same adhesive strength as that of the conventional product is ensured. In addition, by heating at a high temperature as in the case of the conventional product in which the corona discharge treatment is not performed on the thermoadhesive resin layer, it is possible to obtain an adhesive strength higher than that of the conventional product. In addition, since the difference between the heating temperature when the label base material 11 is thermally shrunk and the activation temperature of the heat-adhesive resin layer 16 can be made large, the activation step of the heat-adhesive resin layer 16 can be increased. The distortion due to shrinkage of the label substrate 1 can be suppressed.

Hereinafter, a method for mounting the above-described heat-sensitive adhesive label 1 on a dry battery body whose surface is formed of a metal such as nickel or iron will be described with reference to a label mounting device 30 shown in FIG.

As shown in the figure, the label mounting apparatus 30 includes a label forming section A, a label activation processing section B, a label mounting processing section C, and a heat shrink processing section D. The label mounting device 30 continuously performs a series of operations from the formation of the heat-sensitive adhesive label 1 to the mounting on the dry cell main body X.

In the label forming section A, a long label-forming base material 1 having the same configuration as the heat-sensitive adhesive label 1 except that the heat-adhesive resin layer 16 is not subjected to the corona discharge treatment. a Force Continuously sent out from the base material roll 31 wound up in a roll shape, and subjected to corona discharge treatment on the surface of the heat-adhesive resin layer 16 by a corona discharge treatment device 32, and then a cutting roller The heat-sensitive adhesive label 1 is formed by cutting into a predetermined length by the cutting blade 33 a of 33. The width of the label-forming substrate 1a is set to be slightly longer than the length of the dry cell body X to be mounted.

As described above, the base material roll 31 is wound around the label-forming base material 1 a that has not been subjected to the corona discharge treatment on the heat-adhesive resin layer 16. The heat-adhesive resin layer 16 of the label-forming substrate 1a has no adhesiveness at all, and blocking does not occur because the label-forming substrates 1a come into face contact with each other.

Next, in the label activation processing section B, the heat-sensitive adhesive label 1 formed in the label forming section A is adhered to the outer peripheral surface of the rotating drum 34 with the print layer 13 side thereof being adsorbed. After being conveyed to the heating position, the heat-adhesive resin layer 16 is activated by heating the heat-adhesive resin layer 16 by the heating device 35, and then the heat-sensitive adhesive label〗 is transferred to the label mounting section C. Transport. At this time, since the surface of the heat-adhesive resin layer 16 of the heat-sensitive adhesive label 1 has been subjected to corona discharge treatment, the heating temperature of the heat-adhesive resin layer of the normal heat-sensitive adhesive label (70 to 6) Only at a temperature lower than 65 ° C. (65 ° C. to 60 ° C.), sufficient adhesive strength to the heat-adhesive resin layer 16 can be secured. In addition, label mounting can be speeded up. In addition, the heat of normal heat-sensitive adhesive labels Heating at a temperature equivalent to the heating temperature of the adhesive resin layer (70 to 65 ° C) can ensure an adhesive strength higher than that of conventional products.

On the other hand, since the dry battery main body X is sequentially supplied to the mounting drum 38 of the label mounting processing section C by the transport conveyor 36 and the transfer drum 37, the mounting drum 38 and the mounting guide 39 are used. The heat-sensitive adhesive label 1 is wound around the outer peripheral surface of the supplied dry battery main body X, and the heat-sensitive adhesive label 1 is attached to the outer peripheral surface of the dry battery main body X so that both ends thereof are overlapped with each other. . At this time, both sides in the width direction of the heat-sensitive adhesive label 1 slightly protrude from both ends of the dry battery main body X.

The dry battery main body X to which the heat-sensitive adhesive label 1 has been attached in this manner is transported to the heat shrink processing section D by the transport drum 40 and the transport conveyor 40. A heating device 42 is installed in the heat shrinking treatment section D so as to cover the transport conveyor 41, and the heat-sensitive adhesive attached to the dry cell main body X by the heating device 42 is provided. Since the label 1 is heated to about 130 ° C., the label substrate〗 1 undergoes heat shrinkage, and both sides of the heat-sensitive adhesive label 1 protruding from both ends of the dry battery main body X are covered with the dry battery main body X. Adhere to both end faces.

A heating belt 43 is provided in the heating device 42. The heating belt 43 causes the dry battery body X to roll while the outer peripheral surface is heated and pressed, so that the heat bonding property is improved. The resin layer 16 is activated again, and the heat-sensitive adhesive label 1 is firmly adhered to the outer peripheral surface of the battery cell X, and the overlapping portion of the heat-sensitive adhesive label 1 is also firmly adhered to the heat-sensitive adhesive label. 1 is a battery that is securely installed.

Although the heat-sensitive adhesive label 1 and the label-forming substrate 1a are clearly distinguished here, the label-forming substrate 1a is subjected to a corona discharge treatment. It can also be considered as a long heat-sensitive adhesive label that has not been treated.

FIG. 2 shows another embodiment of the heat-sensitive adhesive label. Since the above-mentioned heat-sensitive adhesive label 1 is a label for the exterior of a dry battery, it is provided with a metal-deposited layer 14 and a printed layer 13 on which various display designs are printed using an ultraviolet curable ink, but other than the dry battery. Fig. 2 shows labels for attaching to products such as metal cans such as beverage cans, food cans, and paint cans, and synthetic resin containers formed of polyesters for beverages, foods, cosmetics, etc. The configuration shown in FIG.

As shown in the figure, the heat-sensitive adhesive label 2 is composed of a label substrate 21 having substantially no heat shrinkage and formed of a biaxially stretched polyester film such as polyethylene terephthalate. It is composed of a printing layer 22 and a heat-adhesive resin layer 23 sequentially formed on one side of the substrate 21, and the heat-adhesive resin layer 23 is formed by heat of the heat-sensitive adhesive label. As in the case of the adhesive resin layer 16, an ethylene acrylic acid copolymer or an ethylene methacrylic acid copolymer is formed by melt extrusion coating to a thickness of about 5> um to 30 Discharge treatment is applied.

The label substrate 21 may be formed of a plastic film such as polypropylene or polyvinyl chloride in addition to the polyester film, and the printing layer 22 may be formed by gravure printing or the like. It can be formed using a known printing technique. Further, synthetic paper, paper or the like may be used as the label base material 21, and the print layer 22 may be formed on the surface side.

In the heat-sensitive adhesive label 2 configured as described above, similarly to the heat-sensitive adhesive label 1, since the heat-adhesive resin layer 23 is subjected to corona discharge treatment, the label is attached to the article. In this case, not only can the activation temperature of the heat-adhesive resin layer 23 be lower than before, but also the bonding strength of the label itself can be increased as compared with the conventional case. Further, in consideration of the above-described blocking and the like, it is desirable to perform the corona discharge treatment on the heat-adhesive resin layer 23 in the heat-sensitive adhesive label 2 when the label is attached to an article.

In addition, since the heat-sensitive adhesive label 2 does not have heat shrinkability, it goes without saying that a heat shrinking step at the time of mounting on a product is unnecessary. In addition, depending on the shape of the article or label to be attached, it is not necessary to wind the label around the entire circumference of the article and affix it to the article so that both ends overlap each other. May be attached to a part of the outer peripheral surface of the cover. Industrial applicability

INDUSTRIAL APPLICABILITY As described above, the heat-sensitive adhesive label and the method of mounting the label according to the present invention are useful when the label is wound around the columnar or tubular article to be mounted and mounted, and particularly, the surface is formed of metal. It is suitable as an external label for a dried battery and its mounting method.

Claims

The scope of the claims

1. In a heat-sensitive adhesive label with a heat-adhesive resin layer formed on a label substrate,

A heat-sensitive adhesive label, wherein the heat-adhesive resin layer is subjected to a corona discharge treatment.

2. The heat-adhesive resin layer is formed of an ethylene acrylic acid copolymer, an ethylene methacrylic acid copolymer, an ethylene acrylate copolymer or an ethylene methacrylate copolymer. The heat-sensitive adhesive label according to claim 1.

3. The heat-sensitive adhesive label according to claim 1, wherein the label substrate is formed of a heat-shrinkable synthetic resin film.

4. a step of supplying a heat-sensitive adhesive label having a heat-adhesive resin layer formed on a label substrate;

Performing a corona discharge treatment on the heat-adhesive resin layer of the supplied heat-sensitive adhesive label;

Heating the thermoadhesive resin layer that has been subjected to the edge discharge treatment to activate the thermoadhesive resin layer;

Affixing the heat-adhesive label with the heat-adhesive resin layer activated to an article to be mounted;

A method of mounting a heat-sensitive adhesive label provided with.

5. Wrap the heat-sensitive adhesive label with the heat-adhesive resin layer activated around the perimeter of the article to be mounted, and put the both ends of the heat-sensitive adhesive label on each other so as to overlap each other. The method for mounting the heat-sensitive adhesive label according to claim 4, which has been attached.

6. Heat-sensitive contact with heat-adhesive resin layer formed on heat-shrinkable label substrate Supplying an adhesive label;

Heating the thermoadhesive resin layer subjected to the corona discharge treatment, thereby activating the thermoadhesive resin layer,

The heat-sensitive adhesive label with the heat-adhesive resin layer activated is placed on the dry battery main body such that both sides protrude from both ends of the dry battery main body whose surface is formed of metal. A step of wrapping the heat-sensitive adhesive label on the outer peripheral surface and affixing the heat-sensitive adhesive label to the dry battery main body so that both end portions of the label overlap with each other;

The heat-sensitive adhesive label attached to the dry battery main body is thermally contracted by heating, and both side portions of the heat-sensitive adhesive label protruding from both end portions of the dry battery main body are attached to both end surfaces of the dry battery main body. A method for mounting a heat-sensitive adhesive label comprising the steps of:

7. A dry battery in which a heat-sensitive adhesive label having a heat-adhesive resin layer formed on a label substrate is attached to an outer peripheral surface,

The label substrate is formed of a heat-shrinkable synthetic resin film,

The heat-adhesive resin layer is formed of an ethylene acrylic acid copolymer, an ethylene methacrylic acid copolymer, an ethylene acrylate copolymer or an ethylene methacrylate copolymer, and is subjected to a corona discharge treatment. Dry batteries.