JP4866073B2 - Heat-shrinkable cylindrical label and container with cylindrical label - Google Patents

Description

  The present invention relates to a heat-shrinkable cylindrical label provided with a foamed resin layer, and a container with a cylindrical label.

  A cup for instant noodle containers, a container for ice confectionery, a beverage container such as coffee, etc. is eaten with the contents at high or low temperature depending on the type. When such a container is held, the temperature of the contents is directly transmitted to the hand, so that it is known to attach a heat-shrinkable heat-insulating label on which a foamed resin layer is laminated in order to provide heat insulation. For example, Japanese Patent Application Laid-Open No. 2001-175179 discloses a heat-shrinkable heat-insulating label in which a foamed resin layer is laminated on a heat-shrinkable film layer, and a container equipped with the heat-shrinkable heat-resistant label is preferable due to its heat shielding effect. .

However, the conventional heat insulating label has a limit in heat insulating properties because the heat insulating effect is caused only by the foamed resin layer. That is, if the foamed resin layer is thickened, the heat insulation is improved, but not only the raw material cost is increased, but it is difficult to shrink the foamed resin layer by the heat shrinkable film, resulting in poor label mounting. In particular, it is difficult to attach such a label to a container having a neck having a large diameter difference.
Accordingly, there is a need for a heat insulating label that can improve heat insulating properties other than the means for thickening the foamed resin layer.

JP 2001-175179 A

  It is an object of the present invention to provide a heat-shrinkable cylindrical label and a container with a cylindrical label that can be favorably attached to a container and are more excellent in heat insulation.

Therefore, the first means of the present invention is to form a label base material in which a foamed resin layer is laminated on a heat-shrinkable film layer that can be thermally shrunk at least in the circumferential direction of the label, with the foamed resin layer inside, in a cylindrical shape. A heat-shrinkable cylindrical label, wherein the resin component of the foamed resin layer is oriented in the longitudinal direction of the label, and the foaming ratio of the foamed resin layer is 1.2 to 5 times, and the heat shrinkage The heat-shrinkable film layer is heat-shrinkable at least in the circumferential direction of the label, and the heat-shrinkage rate in the circumferential direction of the foamed resin layer at the heat-shrink temperature is higher than the heat-shrinkage rate in the circumferential direction of the heat-shrinkable film layer. A small heat-shrinkable cylindrical label is provided.

When the heat-shrinkable cylindrical label is heated to a temperature at which the heat-shrinkable film layer can be heat-shrinkable so as to be attached to a container or the like, the heat-shrinkable film is greatly heat-shrinked in the circumferential direction than the foamed resin layer at the temperature. The foamed resin layer is pulled by the shrinkage force of the layer, and the entire label is thermally shrunk in the circumferential direction. At this time, innumerable streaks in the longitudinal direction are generated on the inner peripheral surface of the foamed resin layer. This is because the shrinkage force is applied in the circumferential direction by the heat shrinkable film layer to the foamed resin layer having a foaming ratio of about 1.2 to 5 times and the resin component oriented in the longitudinal direction. It is considered that unevenness extending in the vertical direction occurs on the peripheral surface.
And, when the label is attached to a container or the like, the foamed resin layer is formed with irregularities, so that the label is more heat-insulating due to the synergistic effect of the air bubbles existing between the irregularities on the foamed resin layer. It will be excellent.

  In a preferred embodiment of the present invention, the thermal shrinkage rate in the circumferential direction at 100 ° C. of the heat shrinkable film layer is 30% or more, and the thermal shrinkage rate in the circumferential direction at 100 ° C. of the foamed resin layer is 15%. It is the said heat-shrinkable cylindrical label which is the following.

  Furthermore, in a preferred embodiment of the present invention, the thickness of the foamed resin layer is the heat-shrinkable cylindrical label having a thickness of 50 to 150 μm, and the label has a heat-shrinkable film layer because the foamed resin layer is relatively thin. Even if the shrinkage stress is not extremely large, the entire label can be surely shrunk, and the unevenness can be formed at the time of mounting, which is preferable.

Furthermore, in a preferred embodiment of the present invention, there is provided a heat-shrinkable cylindrical label in which perforations are formed in the longitudinal direction in at least the heat-shrinkable film layer in the portion having the heat-shrinkable film layer and the foamed resin layer. provide.
Such a heat-shrinkable cylindrical label can be reliably divided along the perforation after being mounted on a container or the like.
That is, the heat-shrinkable film layer having the property of easily tearing in the circumferential direction can be divided along the perforations by forming the perforations. On the other hand, the foamed resin layer laminated on the heat-shrinkable film layer has tearing properties in the vertical direction, and therefore it is not inadvertently split in the circumferential direction by the heat-shrinkable film layer that is easily torn in the circumferential direction. Therefore, the entire heat-shrinkable cylindrical label can be reliably divided in the vertical direction according to the perforation and removed from the mounted body.
In addition, since the foamed resin layer has tearing properties in the vertical direction as described above, the entire label can be easily divided even if a perforation with few breaks is formed.

Furthermore, in a preferred aspect of the present invention, there is provided a heat-shrinkable cylindrical label in which the perforation is not penetrated through the foamed resin layer. In such a heat-shrinkable cylindrical label, the perforation is not penetrating into the foamed resin layer. Therefore, when the heat-shrinkable cylindrical label is attached to an attachment body such as a container, the perforation is cut through the perforation. The outer surface of the wearing body is not visible. Therefore, it is possible to provide a mounted body with a beautiful label on the mounting appearance.
Further, the heat-shrinkable cylindrical label has a tearable property in the vertical direction even if no perforation is formed up to the foamed resin layer. Can be divided reliably.

In addition, according to a second means of the present invention, any one of the above heat-shrinkable cylindrical labels is heat-shrink mounted on at least the body of the container, and the container contact surface of the foamed resin layer has innumerable streaks. The container with a cylindrical label in which the uneven | corrugated | grooved part is formed is provided.

  Since the container with a cylindrical label has innumerable streaky irregularities formed on the container contact surface of the label, the label is created by the synergistic effect of the air layer existing between the irregularities and the bubbles existing in the foamed resin layer. The heat insulation effect is excellent.

  In a preferred aspect of the present invention, the cylindrical label-attached container has a concavo-convex difference of the concavo-convex portion of 50 μm or more.

The heat-shrinkable cylindrical label of the present invention can form irregularities on the inner peripheral surface of the foamed resin layer when mounted on a container or the like. By forming such irregularities, there is a space between them, and in combination with the bubbles inside the foamed resin layer, it is possible to provide a cylindrical label having better heat insulation.
In addition, since the container with a cylindrical label of the present invention is equipped with a cylindrical label having a high heat insulating effect, the temperature of the contents is hardly transmitted directly to the hand, and a suitable container for high or low temperature can be provided. it can.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
1 and 2, reference numeral 1 denotes a label substrate 2 having a heat-shrinkable film layer 3 and a foamed resin layer 5, and the label substrate 2 so that the foamed resin layer 5 constitutes the inner surface of the label. 1 shows a heat-shrinkable cylindrical label formed into a cylindrical shape by superimposing both end portions thereof and performing center sealing.

Specifically, the label base material 2 constituting the cylindrical label 1 includes a heat-shrinkable film layer 3 on which design printing has been performed, an intermediate layer 4 laminated on the inner surface of the heat-shrinkable film layer 3, and this The foamed resin layer 5 is laminated on the inner surface of the intermediate layer 4, and the foamed resin layer 5 constitutes the inner peripheral surface (container contact surface) of the label substrate 2.
The heat-shrinkable film layer 3 is made of a colorless, transparent or colored transparent heat-shrinkable film through which the design printing display can be seen, and the material thereof is not particularly limited. For example, polyester such as polyethylene terephthalate, olefin such as polypropylene, etc. A film made of a thermoplastic resin such as a styrene resin such as a polystyrene resin, polystyrene or styrene-butadiene copolymer, a cyclic olefin resin, a vinyl chloride resin, or the like, and These laminated films are exemplified. Among them, it is preferable to use a polyester film such as polyethylene terephthalate having a relatively strong shrinkage force in order to reliably shrink the entire label by pulling the foamed resin layer 5 and the like. A heat-shrinkable film can be obtained by forming a film by a known production method such as a T-die method or an inflation method and stretching the film. The stretching treatment is usually at a temperature of about 70 to 110 ° C., and about 2.0 to 8.0 times in the circumferential direction (referring to the direction that becomes the circumferential direction when formed on the cylindrical label 1), preferably 3. It is carried out by stretching about 0 to 7.0 times. Furthermore, you may perform a extending | stretching process by the low magnification of 1.5 times or less also in the vertical direction (direction orthogonal to the circumferential direction), for example. The obtained film becomes a uniaxially stretched film or a biaxially stretched film slightly stretched in a direction orthogonal to the main stretch direction. The thickness of the film layer 21 is preferably about 15 to 60 μm and more preferably about 25 to 50 μm.

The heat-shrinkable film layer 3 is preferably a film having a circumferential shrinkage stress at 100 ° C. of 10 MPa or more.
However, the shrinkage stress means that the film piece is cut to 80 mm in the circumferential direction and 15 mm in the longitudinal direction, and both ends in the circumferential direction of the film piece are stress measuring devices (trade name: Autograph, manufactured by Shimadzu Corporation). Is held by a chuck (distance between chucks: 50 mm), and the maximum value of the shrinkage stress in the circumferential direction that occurs when this is immersed in warm water at 100 ° C. for 10 seconds.
Further, the film constituting the heat-shrinkable film layer 3 has a heat shrinkage rate in the circumferential direction of, for example, about 30% or more, preferably about 40% or more when immersed in warm water at 100 ° C. for 10 seconds. Preferably, about 50% or more is exemplified. In addition, the heat shrinkage rate in the vertical direction is about -2 to 15%, preferably about 0 to 10%.
Further, the thermal shrinkage rate in the circumferential direction of the film when immersed in warm water at 90 ° C. for 10 seconds is about 20% or more, preferably about 30% or more, particularly preferably about 40% or more. Is exemplified. In addition, the heat shrinkage rate in the same vertical direction is about -2 to 10%, preferably about 0 to 6%.
However, heat shrinkage rate (%) = [{(original length in circumferential direction (or longitudinal direction)) − (length after immersion in circumferential direction (or longitudinal direction))} / (circumferential direction (or longitudinal direction) ) Original length)] × 100.

The heat-shrinkable film layer 3 is provided with a design print layer 31. The design printing layer 31 is provided, for example, substantially entirely or partially on the inner surface of the heat-shrinkable film layer 3. For example, a predetermined display such as a trade name, a picture, or an explanation can be performed by a known printing method such as gravure printing. It is provided in single color or multicolor printing.
The design print layer 31 is preferably provided on the inner surface side of the heat-shrinkable film layer 3, but can also be provided on the outer surface of the film layer 3.

  Next, as a resin component which comprises the foamed resin layer 5, a polystyrene, polyethylene, a polypropylene, a cyclic olefin, a polyurethane etc. are illustrated, It is preferable to use a polystyrene type since it has high foamability especially. As the styrene-based resin, in addition to a polymer composed of a general-purpose styrene monomer, a copolymer of styrene-butadiene, maleic anhydride, methacrylic acid, and the like with styrene can be used. The foaming method may be a known foaming method such as physical foaming or chemical foaming. Additives such as various colorants, fillers, plasticizers, and stabilizers can be appropriately added to these resins as necessary.

In addition, the dark white foamed resin layer 5 can be obtained by adding titanium oxide or adding a white inorganic substance such as calcium carbonate as a filler.
Since the foamed resin layer 5 is white, the display of the design print layer 31 can be shown clearly. Therefore, the cylindrical label 1 excellent in decorativeness can be configured. Moreover, the foamed resin layer 5 colored in other colors can also be used. The color of the colored foamed resin layer 5 is preferably designed so as to be integrated with the design print layer 31 or the outer surface of the container to be mounted, for example, the same color as the design print layer 31 or the color of the container. The same color as the outer surface is exemplified. By using the colored foamed resin layer 5, the upper and lower edges of the foamed resin layer 5 can be made inconspicuous in the attached cylindrical label 1. That is, when the cylindrical label 1 is attached to the container, the heat-shrinkable film layer 3 is slightly shrunk in the vertical direction and shifted so as to slide vertically, so that the upper and lower sides of the foamed resin layer 5 at the upper and lower edges of the label. Although there is a possibility that an edge may be peeped out, by using the colored foamed resin layer 5, even if the upper and lower edges of the foamed resin layer 5 come out, it is visually absorbed so as to be melted into the design printing layer 31 or the outer surface of the container. It can be disguised and prevented from damaging the appearance of wearing.

In the foamed resin layer 5, the resin component is oriented in the longitudinal direction of the cylindrical label 1. For this reason, the foamed resin layer 5 is contracted in the circumferential direction when the heat-shrinkable film layer 3 is thermally contracted in the circumferential direction, and as a result, streaky irregularities are formed in the vertical direction.
In addition, that the resin component is oriented in the longitudinal direction means that the polymer molecules constituting the foamed resin layer 5 are oriented in the longitudinal direction (direction orthogonal to the circumferential direction). Further, the term “orientated in the longitudinal direction” as used herein means that the material is oriented substantially in the longitudinal direction and does not mean strict directionality. For example, it is slightly inclined with respect to the circumferential direction. Also included are those in which polymer molecules are oriented.
The orientation of the resin component can usually be imparted by a stretching process. Therefore, the foamed resin layer 5 in which the resin components are oriented can be easily obtained by stretching in the longitudinal direction in the production process of the foamed resin sheet used for the foamed resin layer 5. The stretching method may be performed by a known method such as a tube method or a stretching roll method.
The draw ratio is not particularly limited as long as the resin component can be oriented in the longitudinal direction, but if it is too small, it will not be sufficiently oriented, so about 1.5 to 5 times, more preferably about 2 to 3 times in the longitudinal direction is preferable. Moreover, you may be extended | stretched also in the circumferential direction. In this case, the draw ratio in the circumferential direction is about 1.1 to 3 times, preferably about 1.5 to 2.5 times.
In this example in which the non-foamed intermediate layer 4 is laminated on the foamed resin layer 5, for example, the foamed resin layer 5 and the intermediate layer 4 are laminated by coextrusion to produce a laminated sheet. By stretching at least in the longitudinal direction, a sheet in which the foamed resin layer 5 is oriented in the longitudinal direction can be obtained.
Alternatively, the stretched foamed resin sheet (foamed resin layer 5) and the intermediate sheet (intermediate layer 4) may be prepared separately, and an adhesive agent or the like may be applied to the entire laminated surface of both to laminate and adhere.

  In addition, the foamed resin layer 5 has a heat-shrinkable temperature (tubular label) of the heat-shrinkable film layer 3 in order to form streak-like irregularities in the vertical direction due to heat shrinkage in the circumferential direction of the heat-shrinkable film layer 3. 1 is a temperature necessary for heat shrinking the heat shrinkable film layer 3 in order to attach the heat shrinkable film layer 3 to the container), the heat shrinkage rate in the circumferential direction of the foamed resin layer 5 is A thing smaller than a thermal contraction rate is used.

Specifically, the heat shrinkage rate of the foamed resin layer 5 is not particularly limited as long as it is smaller than the heat shrinkage rate in the circumferential direction of the heat shrinkable film layer 3, but for example, immersed in warm water at 100 ° C. for 10 seconds. In this case, the thermal contraction rate in the circumferential direction is preferably about 15% or less, more preferably about 10% or less, and more preferably about 5% or less. The heat shrinkage rate has a correlation with temperature. For example, when 90 ° C. is used as a reference, the heat shrinkage rate is smaller than the above range. The thermal shrinkage rate in the circumferential direction of the foamed resin layer 5 when immersed in warm water at 90 ° C. for 10 seconds is preferably about −2 to 5%.
Further, even if the foamed resin layer 5 is thermally contracted in the longitudinal direction at the heat shrink temperature of the film layer 3, the foamed resin layer 5 is not affected by the heat shrink temperature. However, it is also possible to use a material in which the longitudinal direction is largely heat-shrinked as compared with the circumferential direction.
In this case, the thermal contraction rate in the longitudinal direction of the foamed resin layer 5 is preferably about 30% or less, more preferably about 15% or less, and preferably about 10% or less when immersed in warm water at 100 ° C. for 10 seconds. More preferred. In addition, as the thermal contraction rate in the circumferential direction of the foamed resin layer 5 when immersed in warm water of 90 ° C. for 10 seconds, about −2 to 8% is preferable.
And by using the foamed resin layer 5 which is heat-shrinkable larger than the film layer 3 in the longitudinal direction, the foamed resin layer 5 is heat-shrinkable film layer at the upper and lower edges of the label after mounting. 3 can be prevented from protruding.

In addition, the shrinkage stress of the foamed resin layer 5 is not particularly limited in both the circumferential direction and the longitudinal direction, but for example, 0 to 5 MPa, preferably about 0.5 to 3 MPa is preferable.
However, the shrinkage stress is measured in the same manner as the shrinkage stress described in the film layer 3.

  The foaming ratio of the foamed resin layer 5 is not particularly limited as long as the foamed resin layer 5 is foamed to such an extent that appropriate bubbles can be included. However, since the heat shrinkage of the heat-shrinkable film layer 3 can surely form good irregularities on the inner surface of the foamed resin layer 5, the expansion ratio is about 1.2 times or more, and further about twice. The above is preferable. On the other hand, if the expansion ratio is too high, there is a risk that when the stress is applied to the foamed resin layer 5, the bubbles in the encapsulated material are crushed and irregularities are not formed on the inner peripheral surface. It is preferable to be about the following.

The thickness of the foamed resin layer 5 is appropriately designed so that irregularities can be formed by heat shrinkage of the heat-shrinkable film layer 3 and is not particularly limited. However, if it is too thick, heat shrinkage with extremely strong shrinkage stress. Since the conductive film layer 3 must be used, it is preferably about 200 μm or less, more preferably about 150 μm or less, and more preferably about 100 μm or less.
On the other hand, if it is too thin, the heat insulation effect due to bubbles cannot be expected, and unevenness may not be formed. Therefore, it is preferably about 40 μm or more, more preferably about 50 μm or more, and more preferably about 60 μm or more.

  The intermediate layer 4 is a non-foamed layer and can be formed of a resin as exemplified by the foamed resin layer 5. Especially, since it is excellent in adhesiveness with the foamed resin layer 5, forming with the same kind of resin as the foamed resin layer 5 is preferable. For the same reason as the foamed resin layer 5, the intermediate layer 4 is also preferably colored in the same color as the foamed resin layer.

  The lamination method of the laminated sheet of the heat-shrinkable film layer 3, the intermediate layer 4, and the foamed resin layer 5 is a lamination method in which an adhesive such as dry lamination or thermal lamination in which a heat-sensitive adhesive is sandwiched is interposed. Etc. can be used. In the case of laminating with an adhesive, it is preferable to apply the adhesive on the entire surface of the laminating surface and laminate. In this case, the intermediate layer 4 is interposed between the heat-shrinkable film layer 3 and the foamed resin layer 5 to prevent the adhesive from entering the foamed resin layer 5 and the heat-shrinkable film layer 3 and The contact area of the heat shrinkable film layer 3 and the foamed resin layer 5 can be increased.

  In addition, as above-mentioned, although the label base material 2 consists of a laminated sheet of the heat-shrinkable film layer 3, the intermediate | middle layer 4, and the foamed resin layer 5, the center seal at the time of shape | molding this label base material 2 in consideration of a cylinder is considered. Normally, as shown in FIG. 2 (b), the one side end 2a of the label base material 2 is not laminated with the foamed resin layer 5 and the like, and the inner surface of the heat-shrinkable film layer 3 is exposed. Yes. The one side end 2a of the label base 2 where the inner surface of the heat-shrinkable film layer 3 is exposed is overlapped with the outer surface of the other side end 2b of the label base 2 so as to be center-sealed, thereby thinning the seal portion. It can be formed, and depending on the material of the heat-shrinkable film layer 3, solvent bonding is possible.

The heat-shrinkable cylindrical label 1 is inserted into a mounted body 7 such as a container, led to a shrink tunnel (steam heater) and heated to a heat-shrink temperature (for example, 80 to 100 ° C., preferably 80 to 95 ° C.). The cylindrical label 1 can be mounted on the mounted body 7 as shown in FIG.
As shown in FIG. 4, the obtained cylindrically labeled container 10 has an innumerable number of streaky irregularities 8 extending in the longitudinal direction on the inner peripheral surface (container contact surface) of the foamed resin layer 5. The
Due to the formation of the irregularities, a gap is formed in the irregularity portion 8, and the container with a cylindrical label to which a label having extremely excellent heat insulation is attached due to the synergistic effect of the air layer in the gap and the bubbles inside the foamed resin layer 5. Can be provided. Moreover, this container 10 with a cylindrical label is excellent also in impact resistance.
The average unevenness difference H of the uneven portion 8 is not particularly limited. However, if the unevenness difference H is too small, a sufficient space cannot be formed. Therefore, it is preferably about 50 μm or more, more preferably about 60 μm or more, and more preferably about 70 μm or more.

As the container 7 to be mounted, in addition to containers that require heat insulation, containers that require impact resistance, other general drink containers that do not require heat insulation or shock resistance, food containers, chemical containers, etc. May be used. Examples of containers that are required to have heat insulation include beverage containers that can be cooled or warmed in a refrigerator or hot warmer, containers that store instant noodles, and ice confectionery containers that are filled with ice cream or the like. The material of the container 7 is not particularly limited, and various kinds of metals such as aluminum and steel (including aluminum plates and steel plates laminated with synthetic resin films), synthetic resins such as polyethylene terephthalate, and glass are used. Although it can be attached to an object, it is more effective when attached to a metal container because heat is relatively easily transmitted.
As the shape of the container 7, it can be attached to various shapes such as a cylinder, a cup, and a bottle. In particular, the label of the present invention has the container 7 while the foamed resin layer 5 is laminated. Since it can be satisfactorily adhered even if it is attached to a portion where the diameter difference is large, a more remarkable effect is obtained when it is attached to such a container 7. For example, as shown in FIG. 3, the cylindrical label 1 is shrink-mounted from the barrel portion 71 to the neck portion 72 of the bottle-shaped container 7 having the neck portion 72 that gradually decreases in diameter above the barrel portion 71. The upper edge of the label 1 can be brought into close contact with the neck 72 of the container 7. The cylindrical label 1 of the present invention can be securely adhered to a container portion having a diameter difference of about 1.3 to 2.3 times (ratio in circumference) by shrink mounting.

In the above embodiment, the intermediate layer 4 is interposed between the film layer 3 and the foamed resin layer 5 in order to increase the adhesion, but the intermediate layer 4 is not necessarily required. The intermediate layer 4 may be omitted and the heat-shrinkable film layer 3 and the foamed resin layer 5 may be directly laminated. Furthermore, other layers can also be laminated within a range that does not impair the formation of the unevenness of the foamed resin layer 5.
Moreover, in the said embodiment, although the inner surface of the foamed resin layer 5 comprises the inner peripheral surface (container contact surface) of the cylindrical label 1, it does not foam on the inner surface of the foamed resin layer 5, for example. Layers may be stacked. Specifically, the cylindrical label 1 which consists of layer structures, such as a film layer 3 / intermediate layer 4 / foamed resin layer 5 / non-foamed layer and a film layer 3 / foamed resin layer 5 / non-foamed layer, in order from the outside. Is exemplified. In this case, as the laminated non-foamed layer, a material that does not inhibit the formation of irregularities on the inner surface of the foamed resin layer 5, for example, an extremely thin or flexible film is used.
Also, a label base material obtained by adhering a laminated sheet produced by co-extrusion of the intermediate layer 4 / foamed resin layer 5 / non-foamed layer and the heat-shrinkable film layer 3 by a dry laminating method or the like can be used. .

Moreover, the heat-shrinkable cylindrical label 1 of the present invention may be provided with an easy dividing means for easily dividing the label 1 by hand.
As the easy dividing means, for example, as shown in FIG. 5, perforations 91 formed in the vertical direction of the label 1 (for example, across the upper and lower ends) can be mentioned. The perforations 91 include those in which the cuts 911 and the non-cuts 912 are alternately and continuously formed (that is, the cuts 911 are formed in an intermittent manner). Examples of the cut 911 include an elongated straight cut and a needle hole cut. The length in the vertical direction of the cut line 911 and the non-cut line 912 is not particularly limited, but considering the ease of division and the strength of the label, the vertical length X of the cut line 911: the vertical length Y of the non-cut line is 2: 1 to 1: 5. It is preferable that the ratio is formed. As specific numerical values, the longitudinal length X of the cut line 911 is about 0.1 to 1 mm, and the vertical length Y of the non-cut line 912 is about 0.2 to 3 mm.
The position where the perforation 91 is formed is not particularly limited as long as the heat-shrinkable film layer 3 and the foamed resin layer 5 are laminated, but the center seal portion 11 (the two side ends of the label base material 2 are overlapped). It is preferable that it is formed along the side portion of the bonded portion. Further, the number of perforations 91 is not particularly limited, but two perforations are preferably formed because they can be cut into a strip shape, and particularly two on both sides of the thick center seal portion 11. More preferably, it is formed.

The cut line 911 of the perforation 91 may be formed by cutting over the entire thickness of the label substrate 2 as shown in FIG. Further, the cut line 911 of the perforation 91 may be formed in the heat-shrinkable film layer 3 except for the foamed resin layer 5. Specifically, in the case where the foamed resin layer 5 is excluded and at least the heat-shrinkable film layer 3 is formed, a cut line 911 is formed only in the heat-shrinkable film layer 3 as shown in FIG. (C) The formation of a cut 911 in the heat-shrinkable film layer 3 and the intermediate layer 4 is exemplified.
In addition, as shown in FIG.2 (b), in the one side edge part 2a of the label base material 2, the part of the heat-shrinkable film layer 3 single layer exists. Therefore, when the perforations 91 are formed on the heat-shrinkable film layer 3 except for the foamed resin layer 5 and the perforations 91 are formed on the side portions of the center seal portion 11, A perforation 91 is formed in a region where at least the shrinkable film layer 3 and the foamed resin layer 5 are laminated. However, when two perforations 91 are formed, one of the perforations 91 may be formed in the single layer portion of the heat-shrinkable film layer 3.

The heat-shrinkable cylindrical label 1 excluding the foamed resin layer 3 and having a perforation 91 formed in at least the heat-shrinkable film layer 3 has a cut 911 in the perforation 91 that does not penetrate at least the foamed resin layer 5. For this reason, when the heat-shrinkable cylindrical label 1 is attached to the attachment body 7 such as a container, the outer surface of the attachment body 7 cannot be seen through the cut line 911 of the perforation 91. Therefore, it is possible to provide a mounted body with a beautiful label on the mounting appearance.
In addition, since the foamed resin layer 5 is oriented in the longitudinal direction, it has a large tear property in the longitudinal direction, while the heat-shrinkable film layer 3 has a large tear property in the lateral direction, but tears in the longitudinal direction. The nature is small.
Accordingly, by forming the cut line 911 of the perforation 91 in at least the heat-shrinkable film layer 3 as described above, the heat-shrinkable film layer 3 is divided in the vertical direction along the perforation 91, while the vertical direction Even if the perforated resin layer 5 is not formed, the foamed resin layer 5 having a large tearability is divided in the longitudinal direction according to the division of the heat-shrinkable film layer 3. Therefore, the heat-shrinkable cylindrical label 1 can be easily divided. That is, the heat-shrinkable film layer 3 subjected to the main stretching process in the circumferential direction has a property that it is easy to tear in the circumferential direction and difficult to tear in the longitudinal direction. By forming the perforations 91 in the portion where the foamed resin layer 5 having the property of being easily broken is formed, the label can be surely cut in the longitudinal direction.
In particular, when the heat-shrinkable film layer 3 is composed of a polyester-based film such as polyethylene terephthalate, it is easy to tear in the circumferential direction, but at least by forming a perforation 91 in the heat-shrinkable film 3, It is preferable because it can be divided.
Since the foamed resin layer 5 is tearable in the vertical direction, the entire label can be easily divided even if the perforations 91 having a small number of cuts 911 or short cuts 911 are formed.

  The label base material 2 in which the perforations 91 are formed only in the heat-shrinkable film layer 3 is obtained by replacing the heat-shrinkable film layer 3 in which the perforations 91 are formed in the longitudinal direction of the heat-shrinkable film layer 3 in advance with a foamed resin. It can be obtained by laminating on the layer 5. Further, the label base material 5 in which the perforation 91 is formed in the heat-shrinkable film layer 3 and the intermediate layer 4 similarly forms the perforation 91 in the laminate of the heat-shrinkable film layer 3 and the intermediate layer 4. This can be obtained by laminating the foamed resin layer 5.

Next, as another example of the easy dividing means, for example, as shown in FIG. 7, a cut portion 92 may be formed in the upper edge or / and the lower edge of the heat-shrinkable cylindrical label 1. By providing the cut portion 92 in this way, this becomes a starting point for splitting, so that the label 1 can be cut in the vertical direction. In particular, as shown in the drawing, it is preferable to form the two cut portions 92 with the center seal portion 11 interposed therebetween, because the label 1 can be surely divided while using the thick center seal portion 11.
When using the cutting part 92 as this easy parting means, like the said perforation 91, this cutting part 92 may be cut over the full thickness of the label base material 2, and it is foamed. It may be formed by cutting out at least the heat-shrinkable film layer 3 except the resin layer 5. When the foamed resin layer 5 is excluded and at least the heat-shrinkable film layer 3 is formed, the notch 92 is formed only in the heat-shrinkable film layer 3 as described above, or the heat-shrinkable film layer 3 is formed. For example, forming the cut portion 92 in the intermediate layer 4 is exemplified. However, in consideration of the formation of the cut portion 92, it is preferable that the cut portion 92 is cut over the entire thickness of the label substrate 2.

  Furthermore, as the easy dividing means, the cut portion 92 and the perforation 91 can be used in combination. That is, even if the notch 92 is formed in the upper edge or / and the lower edge of the heat-shrinkable cylindrical label 1 and the perforation 91 is formed in the longitudinal direction continuously to the end of the notch 92. Good. In this case, instead of the perforation 91, a half-cut line may be formed on the inner surface of the heat-shrinkable film layer 3 continuously to the end portion of the cut portion 92.

Moreover, you may apply heat sensitive adhesives, such as a hot-melt-type adhesive agent, to a part of inner peripheral surface (container contact surface) of the heat-shrinkable cylindrical label 1 of this invention.
By coating the heat-sensitive adhesive on the inner peripheral surface of the heat-shrinkable cylindrical label 1 in this way, the heat-sensitive adhesive is activated by heat when the heat-shrinkable cylindrical label 1 is heat-shrink mounted, and the container It adheres to the outer surface of the mounted body 7 such as. Therefore, since the heat-shrinkable cylindrical label 1 is bonded to the mounted body 7 such as a container via the heat-sensitive adhesive, it is possible to reliably prevent inadvertent displacement.

Hereinafter, the present invention will be described in more detail with reference to examples.
(Films used)
Heat shrinkable film: heat shrinkable polyester film (thickness 30 μm), trade name: space screen S7561. Made by Toyobo Co., Ltd. Thermal shrinkage in the circumferential direction: 80% (immersion in warm water at 100 ° C. for 10 seconds). In addition, it is 78% in 90 seconds warm water for 10 seconds.
-Foamed sheet (1): A sheet having a two-layer structure (total thickness of 130 μm) in which a non-foamed intermediate layer (thickness of about 15 μm) is laminated on a foamed resin layer (thickness of about 115 μm) foamed at a foaming ratio of 3 times. The foamed resin layer is a foam obtained by foaming GPPS (manufactured by Toyo Styrene Co., Ltd., general-purpose polystyrene, trade name: Toyo Styrol GP HRM12) three times with carbon dioxide gas, and the intermediate layer is 90% by weight of GPPS. SBR (made by Asahi Kasei Chemicals Co., Ltd., styrene-butadiene rubber, trade name: Toughprene-126) is composed of 10% by weight of titanium oxide and 3PHR added. Made by stretching twice and twice in the transverse direction.
The thermal contraction rate in the longitudinal direction of this laminate is 15% when immersed in warm water at 100 ° C. for 10 seconds (note that 5% in 10 seconds at 90 ° C. warm water), and the thermal contraction rate in the circumferential direction is It was -1% when immersed in warm water at 100 ° C for 10 seconds (-1% for 10 seconds at 90 ° C warm water).

-Foamed sheet (2): A sheet having a two-layer structure (total thickness of 90 μm) in which a non-foamed intermediate layer (thickness of 10 μm) is laminated on a foamed resin layer (thickness of 80 μm) foamed at a foaming ratio of 3 times. The foamed resin layer is a foam in which GPPS (same as above) is foamed three times with carbon dioxide, and the intermediate layer has a composition in which 3 PHR of titanium oxide is added to 90% by weight of GPPS and 10% by weight of SBR (same as above). The laminate was prepared by coextruding both at 170 ° C. and laminating them, and stretching them 3 times in the longitudinal direction and 2 times in the transverse direction.
The thermal contraction rate in the longitudinal direction of this laminate is 18% when immersed in warm water at 100 ° C. for 10 seconds (6% in 90 ° C. warm water for 10 seconds), and the thermal contraction rate in the circumferential direction is It was -1% when immersed in warm water at 100 ° C for 10 seconds (-1% for 10 seconds at 90 ° C warm water).
・ Dry laminating adhesive: Product name: Tick Dry, manufactured by Dainippon Ink & Chemicals, Inc.
・ Installation container: Commercially available bottle-shaped metal beverage container (diameter of cylindrical body: 80 mm).

Example 1-1
The intermediate layer of the heat-shrinkable film and the foamed sheet (1) was bonded using a dry laminate adhesive (dry thickness of about 3 μm) to prepare a substrate. The substrate was cylindrically sealed so that the foamed resin layer was on the inside, and center-sealed to produce a cylindrical label that was approximately 10% larger than the diameter of the barrel of the mounting container.
And this thing was inserted in the said container trunk | drum, it passed through the steam heater of 90 degreeC, and shrink mounted | worn, and the container with a cylindrical label was obtained.

Example 1-2
A container with a cylindrical label was produced in the same manner as in Example 1-1 except that it was formed into a cylindrical shape that was approximately 30% larger than the diameter of the body portion of the mounting container.

Example 2-1
The intermediate layer of the heat-shrinkable film and the foamed sheet (2) was bonded using a dry laminate adhesive (dry thickness of about 3 μm) to prepare a substrate. The substrate was cylindrically sealed so that the foamed resin layer was on the inside, and center-sealed to produce a cylindrical label that was approximately 10% larger than the diameter of the barrel of the mounting container.
And this thing was inserted in the said container trunk | drum, it passed through the steam heater of 90 degreeC, and shrink mounted | worn, and the container with a cylindrical label was obtained.

Example 2-2
A container with a cylindrical label was produced in the same manner as in Example 2-1, except that it was formed into a cylindrical shape approximately 30% larger than the diameter of the body portion of the mounting container.

Comparative Example 1
The label base material produced in Example 1-1 was tightly wound around the body of the mounting container so that the foamed resin layer was in contact with the container, and temporarily fixed with an adhesive tape.

Comparative Example 2
The label base material produced in Example 2-1 was tightly wound around the body of the mounting container so that the foamed resin layer was in contact with the container, and temporarily fixed with an adhesive tape.

About the label of the container with a cylindrical label of the said Example and comparative example, when the state of the surface in the inner peripheral surface (container contact surface) of a foamed resin layer was observed, in the thing of Example 1 and Example 2, It was confirmed that innumerable streaky irregularities were formed on the inner peripheral surface.
Next, the unevenness | corrugation difference of the internal peripheral surface of the foamed resin layer of each case was measured. The results are shown in Table 1.
The unevenness difference is an average value of the height difference between the convex part and the concave part in an arbitrary vertical and horizontal 10 mm range, and a color laser microscope (VK-8500, manufactured by Keyence) was used as a measuring instrument.

In addition, the cylindrically labeled containers of the above examples and comparative examples were put in a thermostatic bath at 60 ° C. for 24 hours, then taken out and left at room temperature for 1 minute, and the container was held by hand from above the label. The time that can be continued was measured. The results are also shown in Table 1.
However, the measurement is an average value of 10 people extracted at random.

The front perspective view which shows one Embodiment of the heat-shrinkable cylindrical label which concerns on this invention. (A) is the AA line expanded sectional view of FIG. 1, (b) is the FF sectional view taken on the line. The front view which shows the beverage container with a label which mounted | wore with the heat-shrinkable cylindrical label of this invention. (A) is the figure which looked at the circled B part of FIG. 3 from the inner surface side, (b) is the CC line end view. (A) is a back perspective view which shows other embodiment of a heat-shrinkable cylindrical label, (b) is an enlarged view of the same circle enclosure D part. It is sectional drawing cut | disconnected by the EE line | wire of FIG. 5, Comprising: (a)-(c) is a partially abbreviate | omitted sectional drawing which shows each modification of the perforation cut. The rear perspective view which shows other embodiment of a heat-shrinkable cylindrical label.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heat-shrinkable cylindrical label, 11 ... Center seal part, 2 ... Label base material, 3 ... Heat-shrinkable film layer, 31 ... Design printing layer, 4 ... Intermediate | middle layer, 5 ... Foamed resin layer, 7 ... Container ( 71 ... trunk part, 72 ... neck part, 8 ... uneven part, 91 ... perforation, 911 ... perforation, 912 ... non-perforation, 92 ... notch part, H ... unevenness difference

Claims (7)

A heat-shrinkable cylindrical label formed by forming a label base material in which a foamed resin layer is laminated on a heat-shrinkable film layer, with the foamed resin layer on the inside,
The resin component of the foamed resin layer is oriented in the longitudinal direction of the label,
The foaming ratio of the foamed resin layer is 1.2 to 5 times,
The heat-shrinkable film layer is heat-shrinkable at least in the circumferential direction of the label, and the heat-shrinkage rate in the circumferential direction of the foamed resin layer at the heat-shrinkage temperature is the heat in the circumferential direction of the heat-shrinkable film layer. A heat-shrinkable cylindrical label characterized by being smaller than the shrinkage rate.   2. The heat shrinkage rate in the circumferential direction at 100 ° C. of the heat-shrinkable film layer is 30% or more, and the heat shrinkage rate in the circumferential direction at 100 ° C. of the foamed resin layer is 15% or less. The heat-shrinkable cylindrical label as described.   The heat-shrinkable cylindrical label according to claim 1 or 2, wherein the foamed resin layer has a thickness of 50 to 150 µm.   The heat-shrinkable cylindrical shape according to any one of claims 1 to 3, wherein perforations are formed in the longitudinal direction in at least the heat-shrinkable film layer in the portion having the heat-shrinkable film layer and the foamed resin layer. label.   The heat-shrinkable cylindrical label according to claim 4, wherein the perforation is not penetrated through the foamed resin layer. The heat-shrinkable cylindrical label according to any one of claims 1 to 5 is a container with a cylindrical label that is heat-shrink mounted on at least a body portion of the container,
An infinite number of streaky irregularities are formed on the container contact surface of the foamed resin layer.   The container with a cylindrical label according to claim 6, wherein the unevenness difference of the uneven portion is 50 μm or more.

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