JP7018732B2 - Heat shrinkable tubular label - Google Patents

Description

The present invention relates to a heat-shrinkable tubular label on which a transparent portion is formed.

The heat-shrinkable tubular label is a tubular label that is heat-shrink-mounted on an adherend by attaching it to an adherend such as a container and heating it. Such heat-shrinkable tubular labels have the desired design and are widely attached to a wide variety of adherends, such as beverage containers, primarily for the purpose of decorating the adherend. The heat-shrinkable tubular label is also called a shrink tube, a shrink label, or the like.
Patent Document 1 discloses that a joint material made of a heat-shrinkable transparent film is provided when the sleeve is formed, in view of the problem that the contents of the container are difficult to see when the opaque foam sleeve is attached to the container. ing. The heat-shrinkable foam sleeve of Patent Document 1 is attached to a container by heat shrinkage.

Jikkai Sho 62-78638

However, when a heat-shrinkable tubular label having a transparent film (joint) interposed between opaque sleeves as in Patent Document 1 is heat-shrinked, wrinkles (longitudinal direction) are formed near the boundary between the sleeve and the joint. There is a problem that wrinkles like folds are generated.

An object of the present invention is to provide a heat-shrinkable tubular label that can be neatly heat-shrinked and attached to an adherend in a heat-shrinkable tubular label having a transparent portion in which an opaque film and a transparent film are connected. ..

The present invention relates to a heat-shrinkable tubular label having a partially transparent portion and heat-shrinkability in the circumferential direction, an opaque film having heat-shrinkability in the circumferential direction of the label and heat-shrinkage in the circumferential direction of the label. A transparent film having a property, which is a transparent film connected between both end portions of the opaque film and constituting the transparent portion between them, and has all temperatures in the range of 80 ° C. to 100 ° C. The circumferential heat shrinkage of the transparent film is smaller than the circumferential heat shrinkage of the opaque film.

The preferred heat-shrinkable tubular label of the present invention has a circumferential heat shrinkage of the opaque film in the range of 80 ° C. to 100 ° C. and a circumferential heat-shrinkage rate of the transparent film in the range of 80 ° C. to 100 ° C. It is less than double.
In the preferred heat-shrinkable tubular label of the present invention, the opaque film itself is opaque.
The preferred heat-shrinkable tubular label of the present invention is a film in which the opaque film exhibits a milky white color.

The heat-shrinkable tubular label of the present invention is formed by connecting an opaque film and a transparent film to form a transparent portion, and can be neatly heat-shrinked and attached to an adherend.

FIG. 3 is a perspective view of a heat-shrinkable tubular label according to one embodiment. Front view of the same heat-shrinkable tubular label folded flat. (A) is a cross-sectional view cut along the line III-III of FIG. 2, and (b) is an enlarged cross-sectional view of a part thereof. A partially omitted perspective view showing a process of manufacturing a heat-shrinkable tubular label. The perspective view which shows the process of attaching a heat-shrinkable tubular label to an adherend. Front view of labeled container. Cross-sectional view of the heat-shrinkable tubular label according to the first modification. A cross-sectional view of a heat-shrinkable tubular label according to a second modification. (A) and (b) are front views of the labeled container according to each modification. The graph which shows the circumferential heat shrinkage rate at 80 degreeC to 100 degreeC of the transparent film and the opaque film used in an Example and a comparative example.

Hereinafter, the present invention will be described with reference to the drawings.
In the present specification, the front surface of the film refers to the outer surface when the film is formed into a tubular shape, and the back surface refers to the opposite surface (the inner surface when the film is formed into a tubular shape). The first direction of the film refers to one direction in the plane of the film, and the second direction refers to the direction in the plane orthogonal to the first direction. Further, the circumferential direction of the heat-shrinkable tubular label means the circumferential direction when the heat-shrinkable tubular label is attached to the adherend. The numerical range represented by "lower limit value X to upper limit value Y" means a lower limit value X or more and an upper limit value Y or less. When a plurality of the numerical values are described separately, it is possible to select an arbitrary lower limit value and an arbitrary upper limit value and set "arbitrary lower limit value to arbitrary upper limit value".
It should be noted that the dimensions such as the thickness of the components and the ratio between the components in each figure are different from the actual ones.

[Overview of heat-shrinkable tubular label]
As shown in FIGS. 1 to 3, the heat-shrinkable tubular label 1 of the present invention has heat-shrinkability at least in the circumferential direction. As used herein, "heat shrinkability" refers to the property of shrinking when heated to a predetermined temperature (for example, 80 ° C to 100 ° C).
The heat-shrinkable tubular label 1 has a heat-shrinkable opaque film 2 at least in its circumferential direction and a transparent film 3 connected to both end portions of the opaque film 2 and having heat-shrinkability at least in the circumferential direction. And, it is composed of.

Here, in the present specification, "transparent" means that an arbitrary number (size 12 points) is printed on a white paper at a position 1 cm away from the back surface side of the target film with black ink. A state in which an object is placed so that a healthy adult can see the number through the film from the front side (for example, if the number 6 is printed, the number 6 can be recognized). The "transparent" may be either colorless and transparent or colored and transparent. Further, in the present specification, "opaque" means a state in which the numbers arranged on the back surface side cannot be visually recognized from the front surface side under the same conditions as described above (a state in which the numbers cannot be recognized). The "opaque" means that it is not possible to determine whether or not printing is on the back side when viewed from the front side under the same conditions as above, and it can be determined that there is some printing on the back side when viewed from the front side under the same conditions as described above. However, it includes a state in which it cannot be determined what it is.

The index of "transparency" can be expressed by using, for example, the total light transmittance. The total light transmittance of the transparent (colorless transparent or colored transparent) film is preferably 70% or more, more preferably 80% or more, and further preferably 90% or more. However, the total light transmittance refers to a value measured by a measuring method based on JIS K 7361 (a test method for the total light transmittance of a plastic-transparent material).
When the index of opacity is expressed by the total light transmittance, the total light transmittance of the opaque film is preferably 50% or less, more preferably 40% or less, and further preferably 30% or less.

As shown in FIG. 1, the heat-shrinkable tubular label 1 before heat-shrinking can be opened in a cylindrical shape as a whole. As will be described later, after the heat-shrinkable tubular label 1 is heat-shrinked, the heat-shrinkable tubular label 1 is deformed so as to be in close contact with the outer shape of the adherend such as a container.
Normally, the heat-shrinkable tubular label 1 is opened in a cylindrical shape when attached to an adherend, as shown in FIG. However, when the heat-shrinkable tubular label 1 is manufactured, stored, and transported, it is folded flat as shown in FIGS. 2 and 3.
In a realistic manufacturing process, the heat-shrinkable tubular label 1 is generally provided in the form of a continuous body in which a plurality of the heat-shrinkable tubular labels 1 are continuously connected and folded into a flat shape, and the continuous body is provided. Each heat-shrinkable tubular label 1 is obtained by appropriately cutting the label 1 and opened in a tubular shape immediately before being attached to the adherend.

The circumference of the heat-shrinkable tubular label 1 is appropriately set according to the adherend to which the label 1 is attached. .3 times.
Further, the vertical length of the heat-shrinkable tubular label 1 is also appropriately set according to the adherend to which the heat-shrinkable tubular label 1 is attached.

[Opaque film]
The opaque film 2 constituting the heat-shrinkable tubular label 1 is in the form of a sheet before being formed into a tubular shape together with the transparent film 3.
From the viewpoint of thermal properties, the opaque film 2 itself has heat shrinkage in at least the first direction (the first direction corresponds to the circumferential direction when the film is formed into a tubular shape). Further, the opaque film 2 itself is opaque from an optical point of view.

The opaque film 2 is not particularly limited as long as it has at least heat shrinkage in the first direction and is opaque and flexible. For example, a colored and opaque synthetic resin film, a foamed resin film, a non-woven fabric, and a metal-deposited film. And these laminated films and the like.
The thickness of the colored and opaque synthetic resin film is not particularly limited, and is, for example, 8 μm to 150 μm, preferably 10 μm to 120 μm, and more preferably 15 μm to 100 μm.
The foamed resin film is a film obtained by foaming a synthetic resin. The foamed resin film becomes opaque due to having innumerable fine bubbles inside. The thickness of the foamed resin film is not particularly limited, and is, for example, 30 μm to 300 μm, preferably 40 μm to 200 μm.
The non-woven fabric is made of synthetic resin fibers in the form of a film by a spunbond method, an adhesive method, a needle punch method, a melt blow method, or the like, and the amount of the fibers is relatively large (for example, the amount of the fibers). 30 g / m ² to 80 g / m ² ), which becomes opaque.
The metal-deposited film is a transparent or opaque synthetic resin film on which a metal such as aluminum is vapor-deposited, and becomes opaque due to the presence of the metal-deposited film.

The synthetic resin constituting the colored and opaque synthetic resin film, the synthetic resin constituting the foamed resin film, the synthetic resin of the fiber constituting the non-woven fabric, and the synthetic resin constituting the metal vapor deposition film are not particularly limited, and are not particularly limited. Known ones can be used independently of each other, for example, polyester resins such as polyethylene terephthalate; olefin resins such as polyethylene, polypropylene and cyclic olefins; styrene resins such as styrene-butadiene copolymers; vinyl chloride. Examples thereof include one containing one kind or a mixture of two or more kinds selected from thermoplastic resins such as based resins as the main component. The main component refers to the component having the heaviest weight among the synthetic resin components.

Preferably, as the opaque film 2, a colored and opaque synthetic resin film, a foamed resin film, or a laminated film having any of these films is used, and more preferably, a colored and opaque synthetic resin film or this film is used. A laminated film is used, more preferably a colored and opaque synthetic resin film. The colored and opaque synthetic resin film may be composed of a single resin layer (single layer film), or a plurality of resin layers (multilayer film laminated in a state where two or more resin layers cannot be separated). It may be composed of.
The colored and opaque synthetic resin film contains the synthetic resin as described above and a suitable colorant. Examples of the colorant include white pigments, black pigments, silver (gray) pigments and the like. As the white pigment, for example, titanium dioxide, barium sulfate, calcium carbonate, alumina white and the like can be used, and among them, titanium dioxide having excellent concealing property, light resistance, heat resistance and the like is preferable. Further, as the black pigment, carbon black or the like can be used. As the silver (gray) pigment, aluminum fine particles, a mixed pigment of a white pigment and a black pigment, and the like can be used.
The synthetic resin film containing a white pigment exhibits a milky white color, the synthetic resin film containing a black pigment exhibits a black color, and the synthetic resin film containing a silver (gray) pigment exhibits a silver color (gray), both of which are opaque. It is a film.
Since it is excellent in hiding property and light resistance, it is more preferable to use a milky white and opaque synthetic resin film (for example, a synthetic resin film containing a white pigment) as the opaque film 2. The content of the white pigment in the opaque synthetic resin film can be appropriately set, and is, for example, 5% by weight to 25% by weight, preferably 6% by weight to 20% by weight, based on the total amount of the film.

The colored and opaque synthetic resin film is obtained by a known film forming method. For example, a resin composition containing a synthetic resin, a colorant, and various additives as needed is mixed with a mixer or the like (a masterbatch containing a pigment may be used), and melted using an extruder. A colored and opaque film can be obtained by extruding from a T-die, stretching it and heat-setting it. The stretching treatment may be either a tenter method or a tube method. The stretching treatment is usually performed at a temperature of about 70 to 110 ° C. in the first direction (for example, the TD direction at the time of film formation) by 2.0 to 8.0 times, preferably about 3.0 to 7.0 times. It is done by doing. Further, if necessary, the stretching treatment may be performed in the second direction (for example, the MD direction at the time of film formation) at a low magnification of, for example, 1.5 times or less. The stretching treatment can impart heat shrinkage to the film.

The heat shrinkage rate of the opaque film 2 in the first direction (circumferential direction) at 90 ° C. is not particularly limited, but is preferable because it can be satisfactorily heat-shrinked and mounted on an adherend having a relatively large diameter difference. It is 30% or more, more preferably 40% or more, still more preferably 45% or more. Hereinafter, the heat shrinkage rate in each of the first directions of the opaque film 2 and the transparent film 3 (the direction corresponding to the circumferential direction when formed into a tubular shape) is referred to as a "circumferential heat shrinkage rate", and the opaque film 2 and the transparent film 2 and the transparent film 3 are transparent. The heat shrinkage rate in each of the second directions of the film 3 (the second direction corresponds to the vertical direction when the film is formed into a tubular shape) is referred to as a "longitudinal heat shrinkage rate".
The larger the circumferential heat shrinkage rate of the opaque film 2 at 90 ° C. is, the more preferable it is, and theoretically, it is less than 100%. Is.
The opaque film 2 may be a film that changes heat in the second direction. When the opaque film 2 is a film that changes heat in the second direction, its longitudinal heat shrinkage rate is, for example, -3 to 15%, preferably 1 to 10%. A negative value in the vertical heat shrinkage rate means heat elongation.
However, in the present specification, the heat shrinkage is the length of the film (original length) before heating (under an atmosphere of 23 ° C.) and the length of the film after being immersed in warm water at a predetermined temperature for 10 seconds (the original length). It is defined by the ratio with the length after immersion), and it is obtained by substituting them into the following formula 1 or formula 2. For example, the heat shrinkage rate at 90 ° C. is measured by immersing in warm water at 90 ° C. for 10 seconds and measuring the length after immersion.
Equation 1: Circumferential heat shrinkage rate (%) = [{(original length in the first direction)-(length after immersion in the first direction)} / (original length in the first direction)] × 100.
Equation 2: Vertical heat shrinkage rate (%) = [{(original length in the second direction)-(length after immersion in the second direction)} / (original length in the second direction)] × 100.

The circumferential heat shrinkage rate of the opaque film 2 at 80 ° C. is smaller than the circumferential heat shrinkage rate at 90 ° C., and the circumferential heat shrinkage rate of the opaque film 2 at 100 ° C. is the circumferential heat shrinkage at 90 ° C. Greater than shrinkage. When the opaque film 2 is a film that changes heat in the second direction, its longitudinal heat shrinkage at 80 ° C. is smaller than the longitudinal heat shrinkage at 90 ° C., and its longitudinal heat shrinkage at 100 ° C. is 90. Greater than the longitudinal heat shrinkage at ° C.
The circumferential heat shrinkage of the opaque film 2 at 80 ° C. is, for example, 3% to 15% smaller than the circumferential heat shrinkage at 90 ° C., and the circumferential heat shrinkage of the opaque film 2 at 100 ° C. is 90. It is 3% to 15% larger than the circumferential heat shrinkage rate at ° C. The heat shrinkage of the opaque film 2 increases with increasing temperature in the range of at least 80 ° C. to 100 ° C.

The opaque film 2 may be provided with any appropriate functional layer such as a design print layer, a barrier layer, a surface protective layer, and a sliding layer, if necessary (these functional layers are not shown). .. These functional layers usually do not have heat shrinkage, but do not inhibit the heat shrinkage of the opaque film 2. These functional layers are formed by, for example, a printing method, and each has a thickness of about 0.5 μm to 10 μm.
The design print layer is a print layer representing a design such as arbitrary characters, symbols, and patterns, and includes a non-patterned print layer printed on the background of display such as characters. The design print layer is formed by one-color ink or multi-color printing using two or more colors of ink. Usually, the design print layer is provided on the front surface side of the opaque film 2 so that the design can be visually recognized from the front surface side of the heat-shrinkable tubular label 1. The design print layer may be provided on the back surface side of the opaque film 2.

The barrier layer is a layer that mainly imparts at least one property of gas barrier property and light barrier property to the film, and is preferably a layer that imparts gas barrier property. Examples of the layer that imparts the optical barrier property include a white print layer, a black print layer, and a silver print layer. These are provided on the back surface of the film alone or by laminating two or more of them. For example, film / white print layer / black print layer / white print layer, film / white print layer / silver print layer / white print layer, film / white print layer / white print layer / black print layer / white print layer, etc. Is exemplified.
The surface protective layer is provided on the outermost surface of the opaque film 2 and is a layer for preventing scratches on the label.
The sliding layer is provided on the innermost back surface of the opaque film 2 and is a layer for improving the sliding when the heat-shrinkable tubular label 1 is attached to the adherend by a mounting device such as a labeler.

[Transparent film]
The transparent film 3 constituting the heat-shrinkable tubular label 1 is in the form of a sheet before being formed into a tubular shape together with the opaque film 2.
From the viewpoint of thermal properties, the transparent film 3 itself has heat shrinkage in at least the first direction (the first direction corresponds to the circumferential direction when the film is formed into a tubular shape). Further, the transparent film 3 itself is transparent from an optical point of view.

The transparent film 3 is not particularly limited as long as it has at least heat shrinkage in the first direction and is transparent and flexible. For example, a colorless transparent or colored transparent synthetic resin film is used, preferably colorless. A transparent synthetic resin film is used. The colorless transparent or colored transparent synthetic resin film may be composed of a single resin layer or may be composed of a plurality of resin layers, as in the case of the opaque film 2.

The transparent film 3 is not particularly limited from the viewpoint of the material, and is a polyester resin such as polyethylene terephthalate and polylactic acid; an olefin resin such as polyethylene, polypropylene and a cyclic olefin; and polystyrene such as polystyrene and a styrene-butadiene copolymer. Examples thereof include those containing one or a mixture of two or more selected from thermoplastic resins such as polystyrene-based resin; polyamide-based resin; vinyl chloride-based resin as the main component.
The thickness of the transparent film 3 is not particularly limited, and is, for example, 8 μm to 150 μm, preferably 10 μm to 120 μm, and more preferably 15 μm to 100 μm.
The transparent film 3 and the opaque film 2 may have the same thickness, or the thickness of either one may be smaller than that of the other. From the viewpoint of effectively preventing the occurrence of wrinkles, the thickness of the transparent film 3 is preferably the same as or smaller than the thickness of the opaque film 2, and the thickness of the opaque film 2 − the thickness of the transparent film 3 = 0 to 20 μm. Is more preferable.

The transparent film 3 is obtained by a known film forming method. For example, a synthetic resin and a resin composition containing various additives as necessary are mixed with a mixer or the like, melted using an extruder, extruded from a T-die, stretched and heat-set. The transparent film 3 can be obtained. The stretching treatment may be either a tenter method or a tube method. The stretching treatment is usually performed at a temperature of about 70 to 110 ° C. in the first direction (for example, the TD direction at the time of film formation) by 2.0 to 8.0 times, preferably about 3.0 to 7.0 times. It is done by doing. Further, if necessary, the stretching treatment may be performed in the second direction (for example, the MD direction at the time of film formation) at a low magnification of, for example, 1.5 times or less. The stretching treatment can impart heat shrinkage to the film.

In the present invention, the circumferential heat shrinkage rate of the transparent film 3 in the range of 80 ° C. to 100 ° C. is the same as or higher than the circumferential heat shrinkage rate of the opaque film 2 in the range of 80 ° C. to 100 ° C. small. That is, at all temperatures in the range of 80 ° C. to 100 ° C., the circumferential heat shrinkage rate of the transparent film 3 is the same as or smaller than the circumferential heat shrinkage rate of the opaque film 2. In the temperature range below 80 ° C. and above 100 ° C., the above relationship may or may not be satisfied. Such a transparent film 3 can be obtained by appropriately setting the type of synthetic resin, the draw ratio, the temperature of the heat set, and the like.

The circumferential heat shrinkage rate of the transparent film 3 at 90 ° C. is not particularly limited on the condition that it is equal to or less than the circumferential heat shrinkage rate of the opaque film 2 at 90 ° C., but is preferably 30% or more, more preferably. It is 40% or more, more preferably 45% or more. The larger the circumferential heat shrinkage rate of the transparent film 3 at 90 ° C. is, the more preferable it is, and theoretically, it is less than 100%. be. The transparent film 3 may be a film that changes heat in the second direction. When the transparent film 3 is a film that changes heat in the second direction, its longitudinal heat shrinkage rate is, for example, -3 to 15%, preferably 1 to 10%.
The circumferential heat shrinkage rate and the longitudinal heat shrinkage rate of the transparent film 3 can be obtained in the same manner as those of the opaque film 2.

The circumferential heat shrinkage of the transparent film 3 at 80 ° C. is smaller than the circumferential heat shrinkage of the transparent film 3 at 90 ° C., and the circumferential heat shrinkage of the transparent film 3 at 100 ° C. is that of the transparent film 3. It is larger than the circumferential heat shrinkage rate at 90 ° C. When the transparent film 3 is a film that changes heat in the second direction, its vertical heat shrinkage rate at 80 ° C. is smaller than the vertical heat shrinkage rate at 90 ° C., and its vertical heat shrinkage rate at 100 ° C. is 90. Greater than the longitudinal heat shrinkage at ° C.
The circumferential heat shrinkage of the transparent film 3 at 80 ° C. is, for example, 3% to 15% smaller than the circumferential heat shrinkage at 90 ° C., and the circumferential heat shrinkage of the transparent film 3 at 100 ° C. is 90. It is 3% to 15% larger than the circumferential heat shrinkage rate at ° C. The heat shrinkage rate of the transparent film 3 increases with increasing temperature in the range of at least 80 ° C. to 100 ° C.

The difference between the circumferential heat shrinkage rate of the opaque film 2 at 80 ° C. and the circumferential heat shrinkage rate of the transparent film 3 at 80 ° C. is preferably as small as possible from the viewpoint of effectively preventing the occurrence of wrinkles. For example, the circumferential heat shrinkage rate of the opaque film 2 at 80 ° C. is 2 times or less, preferably 1.5 times or less, more preferably 1. It is less than 3 times.
The difference between the circumferential heat shrinkage of the opaque film 2 at 90 ° C. and the circumferential heat shrinkage of the transparent film 3 at 90 ° C. is preferably as small as possible for the same reason. For example, the circumferential heat shrinkage rate of the opaque film 2 at 90 ° C. is 2 times or less, preferably 1.5 times or less, more preferably 1. It is less than 3 times.
The difference between the circumferential heat shrinkage of the opaque film 2 at 100 ° C. and the circumferential heat shrinkage of the transparent film 3 at 100 ° C. is preferably as small as possible for the same reason. For example, the circumferential heat shrinkage rate of the opaque film 2 at 100 ° C. is 2 times or less, preferably 1.5 times or less, more preferably 1. It is less than 3 times.
The difference between the circumferential heat shrinkage of the opaque film 2 in the range of 80 ° C. to 100 ° C. and the circumferential heat shrinkage of the transparent film 3 in the range of 80 ° C. to 100 ° C. is preferably as small as possible for the same reason. .. For example, the circumferential heat shrinkage of the opaque film 2 in the range of 80 ° C to 100 ° C is not more than twice the circumferential heat shrinkage of the transparent film 3 in the range of 80 ° C to 100 ° C, preferably 1.5. It is not more than double, more preferably 1.3 times or less.

Similar to the opaque film 2, the transparent film 3 may be provided with any appropriate functional layer such as a design print layer, a barrier layer, a surface protection layer, and a slip layer, if necessary (these may be provided). The functional layer of is not shown). These functional layers usually do not have heat shrinkage, but do not inhibit the heat shrinkage of the transparent film 3. These functional layers are formed by, for example, a printing method, and each has a thickness of about 0.5 μm to 10 μm.
When the design print layer is provided on the transparent film 3, the design print layer is provided to such an extent that the function as the transparent portion is not impaired. As will be described later, when the transparent film 3 is provided for the purpose of confirming the state of the contents through the transparent portion, a design print layer representing, for example, a scale or a quantity display is provided on a part of the transparent film 3.
The design print layer is provided on the back surface and / or the front surface of the transparent film 3.

[Detailed structure of heat-shrinkable tubular label]
As shown in FIGS. 1 to 3, the heat-shrinkable tubular label 1 includes an opaque film 2 rolled into a substantially tubular shape and a transparent film 3 interposed between both end portions of the opaque film 2. , And a transparent portion 4 is provided between both side ends of the opaque film 2. The transparent portion 4 is composed of a part or all of the transparent film 3. In other words, there is a gap between both end portions of the opaque film rolled into a substantially cylindrical shape, and the transparent film 3 is interposed in the gap, so that the transparent portion 4 made of the transparent film 3 is formed between the gaps. Has been done. In the transparent portion 4, the back surface side (and the back surface side to the front surface side) can be visually recognized from the front surface side of the label.

Both the opaque film 2 and the transparent film 3 have their first direction as the circumferential direction. Therefore, both the opaque film 2 and the transparent film 3 constituting the heat-shrinkable tubular label 1 have heat shrinkage in the circumferential direction thereof, and the heat-shrinkable tubular label 1 as a whole when heated to a predetermined temperature. Heat shrinks.
The peripheral length of the opaque film 2 with respect to the peripheral length of the heat-shrinkable tubular label 1 is appropriately set. If it is large, the proportion of the transparent portion becomes relatively small. From this point of view, the circumference of the opaque film 2 is preferably the circumference of the heat-shrinkable tubular label 1 × 0.85 to the circumference of the heat-shrinkable tubular label 1 × 0.99, and is heat-shrinkable. It is more preferable that the circumference of the tubular label 1 × 0.9 to the circumference of the heat-shrinkable tubular label 1 × 0.97. The peripheral length of the transparent portion 4 (corresponding to the width C of the transparent portion 4 described later) corresponds to the peripheral length of the heat-shrinkable tubular label 1-the peripheral length of the opaque film 2. The perimeter means the length in the perimeter direction.

The circumferential first side end 31 of the transparent film 3 is overlapped with the circumferential first side end 21 of the opaque film 2, and the circumferential second end 32 of the transparent film 3 is the opaque film 2. It is overlapped with the second side end portion 22 in the circumferential direction, and the central portion in the circumferential direction of the transparent film 3 does not have the opaque film 2. The central portion in the circumferential direction of the transparent film 3 is the transparent portion 4 in which the back surface side can be visually recognized from the front surface side. The transparent portion 4 extends in a strip shape in the vertical direction. In the illustrated example, the transparent portion 4 has a strip shape extending in the vertical direction from the upper edge to the lower edge of the heat-shrinkable tubular label 1. The width of the transparent portion 4 may be uniform or uneven in the vertical direction. As the above-mentioned uneven case, for example, when the width of the transparent portion 4 has a portion (or a portion where the width is gradually increased) gradually decreasing from the upper side to the lower side, the width of the transparent portion 4 is a part in the vertical direction. In some cases, it is locally smaller (or larger) than other parts. In the illustrated example, the transparent portion 4 has a uniform width over the entire vertical direction.

The back surface of the first side end portion 21 of the opaque film 2 may be overlapped on the surface of the first side end portion 31 of the transparent film 3, or the transparent film 3 may be placed on the surface of the first side end portion 21 of the opaque film 2. The back surface of the first side end portion 31 may be overlapped. Similarly, the back surface of the second side end portion 22 of the opaque film 2 may be overlapped on the surface of the second side end portion 32 of the transparent film 3, or the surface of the second side end portion 22 of the opaque film 2 may be transparent. The back surface of the second side end portion 32 of the film 3 may be overlapped. In the illustrated example, the back surface of the first side end portion 21 of the opaque film 2 is overlapped on the surface of the first side end portion 31 of the transparent film 3, and the opaque film is overlapped with the surface of the second side end portion 32 of the transparent film 3. The back surface of the second side end portion 22 of 2 is overlapped.

The transparent film 3 and the opaque film 2 are adhered to each other in a strip shape in the vertical direction at the portion where the both end portions are overlapped.
The method of bonding the transparent film 3 and the opaque film 2 is not particularly limited, and if solvent bonding is possible, the transparent film 3 and the opaque film 2 may be bonded using a solvent, or may be bonded using an adhesive or a double-sided adhesive tape. good. The illustrated example is the case of solvent bonding, in which case the opaque film 2 and the transparent film 3 are directly bonded as shown in FIG.
The adhesion may be the entire circumferential direction of the overlapped portion, or may be a partial circumferential direction of the portion. From the viewpoint of preventing curling and the like, the film is adhered including the side edges of the film located on the outside. In the illustrated example, of the first side end portion 21 of the opaque film 2, the portion near the first side edge including the first side edge 21a is adhered to the first side end portion 31 of the transparent film 3, and the opaque film 2 is formed. Of the second side end portion 22, the portion near the second side edge including the second side edge 22a is adhered to the second side end portion 32 of the transparent film 3 (see FIG. 3). Therefore, among the first side end portion 31 and the second side end portion 32 of the transparent film 3, the portion near the first side edge including the first side edge 31a and the portion near the second side edge including the second side edge 32a are , Each is a non-adhesive free piece that is not adhered to the opaque film 2.

The adhesive width at the first side end portions 21 and 31 and the adhesive width at the second side end portions 22 and 32 are not particularly limited, but the bonded portion is less likely to shrink due to heat, so the width may be as small as possible. preferable. On the other hand, if the adhesive width is too small, the opaque film 2 and the transparent film 3 may be inadvertently separated. From this point of view, the adhesive width A1 at the first side end portions 21 and 31 and the adhesive width A2 at the second side end portions are each independently preferably 2 mm to 10 mm, more preferably 3 mm to 7 mm. Further, the widths B1 and B2 of the two non-adhesive free pieces (in the illustrated example, the vicinity of the first side edge including the first side edge 31a of the transparent film 3 and the vicinity of the second side edge including the second side edge 32a). The widths B1 and B2) of the portions are not particularly limited, but if they are too large, the non-adhesive free pieces may bend when attached to the adherend, so 5 mm or less is preferable, and 4 mm or less is more preferable. When each of the adhesive widths is not uniform in the vertical direction, the adhesive widths A1 and A2 mean the maximum value thereof.

Further, the width of the transparent portion 4 (in the illustrated example, the distance between the first side edge 21a and the second side edge 22a facing each other of the opaque film 2) is not particularly limited, but if it is too small, the significance of providing the transparent portion 4 is significant. If it is too large, the concealing property of the heat-shrinkable tubular label 1 is lowered. From this point of view, the width C of the transparent portion 4 is 2 mm to 10 mm, preferably 3 mm to 8 mm. When the transparent portion 4 is not uniform in the vertical direction, the width of the transparent portion 4 means the maximum value thereof.
The "width" of each part means the length in the circumferential direction.
By connecting the transparent film 3 between the both end portions of the opaque film 2 in this way, an opaque heat-shrinkable tubular label 1 having a partially transparent portion 4 is formed.

The heat-shrinkable tubular label 1 may be provided with conventionally known configurations such as an opening perforation line and an opening cut. Further, the heat-shrinkable tubular label 1 may be provided with other conventionally known members such as a peelable adhesive seal and a POP label.

[Manufacturing of heat-shrinkable tubular labels]
The heat-shrinkable tubular label 1 can be manufactured, for example, as follows.
As shown in FIG. 4, a long strip-shaped transparent film raw fabric having heat shrinkage in the lateral direction is attached to the first side end portion of the long strip-shaped opaque film original fabric 51 having heat shrinkage in the lateral direction. A long film 53 is formed to which the first side end portion of 52 is adhered. While rolling the long film 53 with the lateral direction of the long film 53 as the circumferential direction, use a solvent or the like to attach the second side end of the transparent film raw fabric 52 to the second side end of the opaque film raw fabric 51. By adhering them together, a long heat-shrinkable tubular label continuum 54 is obtained. By cutting the continuum 54 to a predetermined length, the heat-shrinkable tubular label 1 can be obtained.

[Example of using heat-shrinkable tubular label]
The heat-shrinkable tubular label 1 of the present invention is used by being heat-shrink-mounted on an adherend as in the conventional case.
The adherend is not particularly limited, and examples thereof include containers filled with contents, as well as articles themselves such as toys and machine parts. Further, the heat-shrinkable tubular label 1 of the present invention may be attached so as to bind a plurality of adherends together.
The heat-shrinkable tubular label 1 of the present invention having the transparent portion 4 is preferably attached to a container having the transparent portion. The container may be substantially entirely transparent, partly transparent and partly opaque. Preferably, the heat shrinkable tubular label 1 is attached to a container having an entirely transparent container body.

For example, as shown in FIG. 5, the container 7 is provided above the transparent shoulder portion 72 and the transparent shoulder portion 72 formed above the transparent body portion 71 and the diameter is reduced toward the upper side. It has a container body 73 having a spout (not shown) and an opaque lid 74 that opens and closes the spout.
At least the body 71 and the shoulder 72 of the container body 73 are transparent so that the contents in the container can be visually recognized by the transparent portion 4.
The container body 73 is not particularly limited in terms of its material, and examples thereof include synthetic resin and glass. The contents to be filled in the container 7 are not particularly limited, and examples thereof include cosmetics, pharmaceuticals, beverages such as juice, seasonings such as cooking oil and soy sauce, foods, sanitary products such as liquid detergents and shampoos for refilling. ..
For example, the heat-shrinkable tubular label 1 is externally attached to the container 7 so that the transparent portion 4 of the heat-shrinkable tubular label 1 covers the transparent portion of the container 7, and then heated to form a heat-shrinkable tubular label. A labeled container 9 with the label 1 attached to the container 7 is obtained (see FIG. 6).
The heat treatment is not particularly limited, but is preferably carried out in a temperature range in which the temperature of the heat-shrinkable tubular label 1 is 85 ° C. to 100 ° C., preferably 90 ° C. to 97 ° C. Examples of the heating method include a method of passing through a hot air tunnel and a steam tunnel, a method of heating with radiant heat such as infrared rays, and the like. The heating time is preferably 4 to 20 seconds from the viewpoint of preventing the occurrence of wrinkles.

In the labeled container 9 shown in FIG. 6, the heat-shrinkable tubular label 1 is heat-shrink-mounted on the entire body portion 71 and shoulder portion 72 and the lid portion 74 (so-called full shrink). In the labeled container 9, the heat-shrinkable tubular label 1 having excellent concealing property is attached to the entire transparent portion of the container body 73 except for the bottom of the container 7. Therefore, the contents in the container 7 are less likely to be deteriorated by ultraviolet rays or the like. Further, since the heat-shrinkable tubular label 1 is provided with a transparent portion 4 (transparent film 3) extending in a vertical band shape from the upper edge to the lower edge, the state of the contents can be checked through the transparent portion 4. It can be visually recognized from the outside.
The heat-shrinkable tubular label 1 of the present invention includes a transparent film 3 having a circumferential heat shrinkage in the range of 80 ° C. to 100 ° C. equal to or smaller than the circumferential heat shrinkage of the opaque film 2 in the same temperature range. Since it is used, wrinkles are unlikely to occur, and it can be neatly attached to the adherend by heat shrinkage.

Since the transparent film 3 has heat shrinkage in the circumferential direction, the highly shrinkable portion (relatively) of the heat shrinkable tubular label 1 may be affected by the heat shrinkage mounting conditions of the heat shrinkable tubular label 1 on the container 7. In the portion that shrinks greatly), the width of the transparent portion 4 may be smaller than that of the portion that shrinks relatively small (the portion that shrinks relatively small). For example, in the example shown in FIG. 6, of the heat-shrinkable tubular label 1, the portion attached to the shoulder portion 72 and the lid portion 74 of the container 7 is a highly shrinkable portion, and the portion attached to the body portion 71 of the container 7. Can be said to be a low shrinkage portion, but the transparent portion 4 corresponding to the high shrinkage portion may have a smaller width as shown in the figure.

Further, since the heat-shrinkable tubular label 1 of the present invention uses the opaque film 2 having heat-shrinkability in the circumferential direction and the transparent film 3 having heat-shrinkability in the circumferential direction, the lid portion 74 of the container 7 is used. Wrinkles extending vertically from the top surface of the container 7, a portion extending from the top surface portion to the side surface portion of the lid portion 74 of the container 7 (corner portion of the lid portion 74), and a portion extending from the bottom portion of the container 7 to the body portion 71 (container body). Lifting (so-called tsuno standing) that occurs at the bottom corner portion of 73 is unlikely to occur, and it can be neatly attached by heat shrinkage.

[Modification example]
The present invention is not limited to the above, and various design changes can be made within the scope of the present invention. Hereinafter, with respect to the configuration similar to the configuration of the above embodiment, terms and reference numerals may be used and the description thereof may be omitted.
In the heat-shrinkable tubular label 1 of the above illustrated example, the surface of the first side end portion 31 of the transparent film 3 and the surface of the second side end portion 32 are covered with the first side end portion 21 of the opaque film 2. The back surface and the back surface of the second side end portion 22 are overlapped and bonded in whole or in part.
For example, as shown in FIG. 7, on the front surface of the first side end portion 21 of the opaque film 2 and the surface of the second side end portion 22, the back surface of the first side end portion 31 and the second side end portion 32 of the transparent film 3 The back surface of the film may be overlapped and adhered in whole or in part. When the transparent film 3 is arranged on the surface side in this way, it is preferable that the transparent film 3 includes the first side edge 31a and the second side edge 32a of the transparent film 3, which are the side edges of the film located on the outside. .. For example, of the first side end portion 31 of the transparent film 3, the portion near the first side edge including the first side edge 31a is adhered to the first side end portion 21 of the opaque film 2, and the second side edge portion 31 of the transparent film 3 is adhered to. Of the side end portions 32, a portion near the second side edge including the second side edge 32a is adhered to the second side end portion 22 of the opaque film 2. In this case, of the first side end portion 21 and the second side end portion 22 of the opaque film 2, the portion near the first side edge including the first side edge 21a and the portion near the second side edge including the second side edge 22a. However, it becomes a non-adhesive free piece.

Further, as shown in FIG. 8, the back surface of the first side end portion 21 of the opaque film 2 is overlapped on the surface of the first side end portion 31 of the transparent film 3, and the surface of the second side end portion 22 of the opaque film 2 is overlapped. The back surface of the second side end portion 32 of the transparent film 3 may be overlapped with the transparent film 3, and the overlapped portion may be entirely or partially adhered to the surface. In this case, it is preferable that the first side edge 21a of the opaque film 2 and the second side edge 32a of the transparent film 3, which are the side edges of the film located on the outside, are included and adhered. For example, of the first side end portion 21 of the opaque film 2, the portion near the first side edge including the first side edge 21a is adhered to the first side end portion 31 of the transparent film 3, and the second side edge portion 31 of the transparent film 3 is adhered to. Of the side end portions 32, a portion near the second side edge including the second side edge 32a is adhered to the second side end portion 22 of the opaque film 2. In this case, the portion near the first side edge including the first side edge 31a of the transparent film 3 and the portion near the second side edge including the second side edge 22a of the opaque film 2 are non-adhesive free pieces.

Further, as shown in FIG. 9A, the heat-shrinkable tubular label 1 may be attached to the bottle-shaped container 7. Further, in the labeled container 9 of the above illustrated example, the entire transparent portion (excluding the bottom) of the container body 73 is covered with the heat-shrinkable tubular label 1, but for example, FIG. 9 ( As shown in b), the upper portion of the shoulder portion 72 and / or the lower portion of the body portion 71 may not be covered with the heat-shrinkable tubular label 1. Further, as shown in FIG. 6B, the heat-shrinkable tubular label 1 may be attached to the container 7 having the entangled portion 75 (reduced diameter portion) in the middle portion of the body portion 71.

Hereinafter, examples of the present invention will be described, but the present invention is not limited to the following examples.

[Material used]
-Opaque film A polyethylene terephthalate stretched film (opaque film exhibiting milky white color) containing titanium oxide having a thickness of 40 μm was used.
・ Transparent film (1)
A polyethylene terephthalate stretched film (colorless and transparent film) having a thickness of 30 μm was used.
・ Transparent film (2)
A polyethylene terephthalate stretched film (colorless and transparent film) having a thickness of 25 μm was used.
・ Transparent film (3)
A polyethylene terephthalate stretched film (colorless and transparent film) having a thickness of 20 μm was used.
・ Transparent film (4)
A polyethylene terephthalate stretched film (colorless and transparent film) having a thickness of 40 μm was used.
・ Transparent film (5)
A polyethylene terephthalate stretched film (colorless and transparent film) having a thickness of 30 μm was used.
・ Transparent film (6)
A polyethylene terephthalate stretched film (colorless and transparent film) having a thickness of 40 μm was used.
・ Transparent film (7)
A stretched film (colorless and transparent film) having a three-layer structure of a polyethylene terephthalate layer / a polystyrene layer / a polyethylene phthalate layer and a thickness of 40 μm was used.
・ Transparent film (8)
A polyethylene terephthalate stretched film (colorless and transparent film) having a thickness of 40 μm was used.

[Measurement of heat shrinkage]
The heat shrinkage rate (circumferential heat shrinkage rate) in the first direction of the opaque film and the transparent films (1) to (8) was measured.
Specifically, for each of the opaque film and the transparent films (1) to (8), the sample piece is cut into a length of the first direction (main heat shrinkage direction) × a length of the second direction = 50 mm × 50 mm. Made. The sample piece was allowed to stand at room temperature (about 23 ° C.) under normal pressure, and then the length of the sample piece in the first direction was measured. Next, the sample piece was immersed in warm water at 80 ° C. for 10 seconds, and then the length in the first direction was measured immediately. The length before and after immersion was substituted into the above formula 1 to determine the heat shrinkage rate in the first direction (heat shrinkage rate in the circumferential direction) at 80 ° C.
The temperature of the hot water is changed to 90 ° C. and 100 ° C., and similarly, the heat shrinkage rate (circumferential heat shrinkage rate) of the opaque film and the transparent film (1) to (8) in the first direction at 90 ° C. and 100 ° C., respectively. ) Was asked. The results are shown in Table 1 and FIG.
For reference, the heat shrinkage rate (longitudinal heat shrinkage rate) of the opaque film and the transparent films (1) to (8) in the second direction at 80 ° C. was also measured and found to be about 10% or less. rice field.

[Example 1]
An opaque film and a transparent film (1) were used. By adhering the front surfaces of both end portions of the transparent film to the back surface side of both end portions of the opaque film rolled into a tubular shape using a solvent while making the first direction of each film the circumferential direction. A heat-shrinkable tubular label as shown in FIGS. 1 to 3 was produced.
The length of the heat-shrinkable tubular label in the vertical direction was 140 mm, and the circumference thereof was 96 mm. Further, referring to FIG. 3B, the adhesive widths A1 and A2 of the heat-shrinkable tubular label are all 3 mm, the widths B1 and B2 of the non-adhesive free pieces are all 4 mm, and the width C of the transparent portion. Was 6 mm.

[Examples 2 to 5, Comparative Examples 1 to 3]
A heat-shrinkable tubular label was produced in the same manner as in Example 1 except that the transparent film shown in Table 2 was used instead of the transparent film (1).

[Mounting test]
A commercially available transparent container made of polyethylene terephthalate having a shape as shown in FIG. 5 was prepared.
Each of the heat-shrinkable tubular labels obtained in Examples 1 to 5 and Comparative Examples 1 to 3 is externally attached to this container, and the heat-shrinkable tubular label is inserted into a steam tunnel to sprinkle 10 steam from the outside of the heat-shrinkable tubular label. The heat-shrinkable tubular label was heat-shrinked by performing a heat treatment of contact for a second. In this way, a labeled container (so-called full shrink) in which the heat-shrinkable tubular label as shown in FIG. 6 was heat-shrink-mounted on the entire body and shoulders except the bottom and on the lid was produced.

Regarding the obtained labeled container, the mounting finish of the heat-shrinkable tubular label (particularly, the finish near the transparent film) was confirmed.
The heat-shrinkable tubular labels of Examples 1 to 5 were neatly attached in appearance, and the occurrence of wrinkles could not be confirmed even when the vicinity of the transparent film was touched by hand.
In all of the heat-shrinkable tubular labels of Comparative Examples 1 to 3, vertical wrinkles and ridges are generated at the corners of the lid and the bottom corners of the container body, and the wrinkles and the like are not present. I could clearly confirm it visually.

As described above, Examples 1 to 5 using a transparent film having a circumferential heat shrinkage ratio in the range of 80 ° C. to 100 ° C. smaller than that of the opaque film had good shrinkage finish.
On the other hand, Comparative Example 1 using a transparent film having a larger circumferential heat shrinkage than the opaque film at 90 ° C to 100 ° C, and a transparent film having a larger circumferential heat shrinkage than the opaque film at 80 ° C to 100 ° C were used. Comparative Example 2 and Comparative Example 3 using a transparent film having a larger circumferential heat shrinkage than the opaque film at 80 ° C. to 90 ° C. had poor finishes.

1 Heat-shrinkable tubular label 2 Opaque film 21 First side end of opaque film 22 Second side end of opaque film 3 Transparent film 31 First side end of transparent film 32 Second side end of transparent film 4 Transparent part

Claims (4)

In a heat-shrinkable tubular label having a partially transparent portion and heat-shrinkability in the circumferential direction.
An opaque film having heat shrinkage in the circumferential direction of the label and a transparent film having heat shrinkage in the circumferential direction of the label, which are connected between both end portions of the opaque film and constitute the transparent portion between them. With a transparent film,
A heat-shrinkable tubular label in which the circumferential heat shrinkage of the transparent film is smaller than the circumferential heat shrinkage of the opaque film at all temperatures in the range of 80 ° C. to 100 ° C. The heat according to claim 1, wherein the circumferential heat shrinkage rate of the opaque film in the range of 80 ° C. to 100 ° C. is twice or less the circumferential heat shrinkage rate of the transparent film in the range of 80 ° C. to 100 ° C. Shrinkable tubular label. The heat-shrinkable tubular label according to claim 1 or 2, wherein the opaque film itself is opaque. The heat-shrinkable tubular label according to any one of claims 1 to 3, wherein the opaque film is a film exhibiting a milky white color.

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