JP2019066582A - Heat-shrinkable cylindrical label - Google Patents

Abstract

To provide a heat-shrinkable cylindrical label that can be attached to an adherend beautifully in a heat-shrinkable manner in heat-shrinkable cylindrical labels including a transparent portion coupling an opaque film and a transparent film.SOLUTION: A heat-shrinkable cylindrical label 1 having a transparent portion 4 formed in part and having heat shrinkability in a circumferential direction includes: an opaque film having heat shrinkability in a circumferential direction of a label; a transparent film having heat shrinkability in the circumferential direction of the label, coupled with between both ends of the opaque film and forming the transparent portion 4 between them; and a transparent film 3 coupled with between both ends 21 and 22 of the opaque film 2 and having heat shrinkability in the circumferential direction of the label. A circumferential direction heat shrinkage rate of the transparent film 3 in a range of 80°C-100°C is equal to or less than a circumferential direction heat shrinkage rate of the opaque film 2 in the range of 80°C-100°C.SELECTED DRAWING: Figure 1

Description

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

The heat-shrinkable cylindrical label is a cylindrical label that is heat-shrinkably attached to an adherend by packaging it on an adherend such as a container and heating it. Such heat-shrinkable tubular labels have a desired design and are widely mounted on a wide variety of adherends, such as beverage containers, primarily for the purpose of decorating the adherends. The heat-shrinkable cylindrical 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 forming the sleeve, in view of the problem that when the opaque foam sleeve is attached to the container, the contents of the container are difficult to see. ing. The heat-shrinkable foam sleeve of Patent Document 1 is attached to the container by heat contraction.

Japanese Utility Model Publication No. 62-78638

  However, when the heat-shrinkable cylindrical label in which a transparent film (joint material) is interposed between opaque sleeves as in Patent Document 1 is thermally shrunk, wrinkles (longitudinal direction) are generated near the boundary between the sleeve and joint material. There is a problem that it is a problem that leads to

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

  The present invention relates to a heat-shrinkable cylindrical label partially formed with a transparent portion and having 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. C. to 100.degree. C. of the transparent film, comprising a transparent film having elasticity, which is connected between both ends of the opaque film and constitutes the transparent portion therebetween. The circumferential heat shrinkage in is the same as or smaller than the circumferential heat shrinkage in the range of 80 ° C. to 100 ° C. of the opaque film.

In a preferred heat-shrinkable cylindrical label according to the present invention, the circumferential heat shrinkage rate of the opaque film in the range of 80 ° C. to 100 ° C. is 2 of the circumferential heat shrinkage rate of the transparent film in the range of 80 ° C. to 100 ° C. Less than twice.
In a preferred heat-shrinkable cylindrical label of the present invention, the opaque film itself is opaque.
A preferred heat-shrinkable cylindrical label of the present invention is a film in which the opaque film exhibits a milky white color.

  The heat-shrinkable cylindrical label of the present invention is a transparent film formed by connecting an opaque film and a transparent film, and can be heat-shrinkably attached to an adherend.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the heat-shrinkable cylindrical label which concerns on one embodiment. The front view of the state which folded the heat-shrinkable cylindrical label flatly. (A) is the cross-sectional view cut | disconnected by the III-III line of FIG. 2, (b) is the cross-sectional view which expanded the one part. The partially-omission perspective view which shows the process of manufacturing a heat-shrinkable cylindrical label. The perspective view which shows the process in which a heat-shrinkable cylindrical label is mounted | worn with a to-be-adhered body. Front view of a labeled container. The cross-sectional view of the heat-shrinkable cylindrical label which concerns on a 1st modification. The cross-sectional view of the heat-shrinkable cylindrical label which concerns on a 2nd modification. (A) And (b) is a front view of the labeled container which concerns on a modification, respectively. The graph which shows the circumferential direction thermal contraction rate in 80 degreeC-100 degreeC of the transparent film and opaque film which were used by the Example and the comparative example.

Hereinafter, the present invention will be described with reference to the drawings.
In the present specification, the surface of the film refers to the surface that is the outside when it is formed into a cylindrical shape, and the back refers to the surface on the opposite side (the surface that becomes the inside when it is formed into the cylindrical shape). The first direction of the film indicates one direction in the plane of the film, and the second direction indicates the direction orthogonal to the first direction in the plane. Further, the circumferential direction of the heat-shrinkable cylindrical label refers to the circumferential direction when the heat-shrinkable cylindrical label is attached to the adherend. The numerical range represented by “lower limit value X to upper limit value Y” means lower limit value X or more and upper limit value Y or less. When a plurality of the numerical value ranges are separately described, 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 components in each figure and the ratio between elements are different from the actual ones.

[Overview of Heat Shrinkable Tubular Label]
As shown in FIGS. 1 to 3, the heat-shrinkable cylindrical label 1 of the present invention has heat-shrinkability at least in the circumferential direction. As used herein, “heat-shrinkable” refers to the property of shrinking when heated to a predetermined temperature (eg, 80 ° C. to 100 ° C.).
The heat-shrinkable cylindrical label 1 is an opaque film 2 having heat-shrinkability at least in the circumferential direction, and a transparent film 3 connected to both side ends of the opaque film 2 and having heat-shrinkability at least in the circumferential direction. And consists of.

  Here, in the present specification, “transparent” is an arbitrary number (12 points in size) printed with black ink on white paper on the back side of the target film at a position 1 cm away from the back side. A state where things can be arranged and a healthy adult can see the number from the front side through the film (for example, if the number 6 is printed, the number 6 can be recognized). The "transparent" may be either colorless or colored or transparent. Moreover, in this specification, "opaque" means the state (state which can not recognize number) which can not visually recognize the number arrange | positioned on the back side on the conditions same as the above-mentioned. The above-mentioned "opaque" can be determined that the presence or absence of printing on the back side can not be determined as viewed from the front side under the same conditions as described above, and that printing is present on the back side as viewed from the front side under the same conditions as described above. However, it includes the condition that it can not determine what.

The index of "transparent" can be expressed 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 still more preferably 90% or more. However, a total light transmittance means the value measured by the measuring method based on JISK7361 (The test method of the total light transmittance of a plastics-transparent material).
The total light transmittance of the opaque film is preferably 50% or less, more preferably 40% or less, and still more preferably 30% or less, when the opaque index is represented by the total light transmittance.

The heat-shrinkable cylindrical label 1 before heat-shrinking can be opened in a generally cylindrical shape as shown in FIG. As described later, after the heat-shrinkable cylindrical label 1 is thermally shrunk, the heat-shrinkable cylindrical label 1 is deformed so as to be in close contact with the outer shape of the adherend such as a container.
Usually, the heat-shrinkable cylindrical label 1 is opened in a cylindrical shape when mounted on an adherend as shown in FIG. However, at the time of manufacture, storage, and conveyance of the heat-shrinkable cylindrical label 1, as shown in FIG.2 and FIG.3, it is folded flatly.
In a practical manufacturing process, generally, the heat-shrinkable cylindrical label 1 is provided in the form of a continuous body which is a continuous body in which a plurality of them are continuously connected and which is folded in a flat shape, and this continuous body Is cut appropriately to obtain the individual heat-shrinkable cylindrical labels 1 and opened in a cylindrical shape immediately before mounting on the adherend.

The circumferential length of the heat-shrinkable cylindrical label 1 is appropriately set according to the adherend on which the heat-shrinkable tubular label 1 is attached. For example, the maximum circumferential length of the attachment site of the adherend x 1.01 .3 times.
Further, the longitudinal length of the heat-shrinkable cylindrical label 1 is also appropriately set in accordance with the adherend on which the heat-shrinkable cylindrical 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.
The opaque film 2 itself has heat shrinkability in at least the first direction (the first direction corresponds to the circumferential direction when the film is formed in a cylindrical shape) in terms of thermal properties. Moreover, the opaque film 2 itself is opaque from an optical viewpoint.

The opaque film 2 is not particularly limited as long as it has at least heat shrinkability in the first direction and is opaque and flexible. For example, colored and opaque synthetic resin film, foamed resin film, nonwoven fabric, metallized film And these laminated films etc. are mentioned.
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 in which a synthetic resin is foamed. The foamed resin film becomes opaque by having numerous fine cells therein. 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 a synthetic resin fiber made into a film by a spun bond method, an adhesion method, a needle punch method or a melt blow method, and the like, by relatively increasing the fiber basis weight (for example, the fabric weight) ^{30g / m 2 ~80g / m 2} ), becomes opaque.
The metal-deposited film is a film in which a metal such as aluminum is deposited on a transparent or opaque synthetic resin film, 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 fibers constituting the non-woven fabric, and the synthetic resin constituting the metallized film are not particularly limited, and Known resins can be used, each independently, for example, polyester resins such as polyethylene terephthalate; olefin resins such as polyethylene, polypropylene, cyclic olefin, etc .; styrene resins such as styrene-butadiene copolymer; vinyl chloride What has as a main component 1 type, or 2 or more types of mixtures chosen from thermoplastic resins, such as a system resin, is mentioned. The main component refers to the component with the largest weight among the synthetic resin components.

Preferably, a laminated film having any of a colored and opaque synthetic resin film, a foamed resin film, or a film thereof is used as the opaque film 2, and more preferably, a colored and opaque synthetic resin film or this film is used. A laminated film is used, and more preferably, a colored and opaque synthetic resin film is used. The colored and opaque synthetic resin film may be composed of a single resin layer (single-layer film), and a plurality of resin layers (a multilayer film laminated in a state in which two or more resin layers can not be separated) It may be composed of
The colored and opaque synthetic resin film contains a synthetic resin as described above and a suitable colorant. As a coloring agent, a white pigment, a black pigment, a silver color (gray) pigment etc. are mentioned. 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 excellent in the shielding property, light resistance, heat resistance and the like is preferable. Moreover, carbon black etc. can be used as a black pigment. As the silver (grey) 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 white pigment has a milky white color, the synthetic resin film containing black pigment has a black color, and the synthetic resin film containing silver color (gray) has a silver color (gray), both of which are opaque It is a film.
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 because it is excellent in hiding power and light resistance. The content of the white pigment in the opaque synthetic resin film can be set as appropriate, 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 and a colorant and, if necessary, various additives, is mixed by a mixer or the like (a master batch containing a pigment may be used) and melted using an extruder. The colored and opaque film can be obtained by extruding from a T-die, stretching and heat-setting it. The stretching process 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., and is stretched about 2.0 to 8.0 times, preferably about 3.0 to 7.0 times in the first direction (for example, the TD direction during film formation) It is done by doing. Furthermore, if necessary, the stretching treatment may be performed at a low magnification of, for example, 1.5 or less in the second direction (for example, the MD direction at the time of film formation). The heat treatment can be imparted to the film by the stretching treatment.

The thermal contraction rate in the first direction (circumferential direction) at 90 ° C. of the opaque film 2 is not particularly limited, but it is preferable from the viewpoint of being able to be heat-shrinkably attached to adherends having relatively large diameter differences. It is 30% or more, more preferably 40% or more, and still more preferably 45% or more. Hereinafter, the thermal contraction rate in each first direction (direction corresponding to the circumferential direction when formed in a cylindrical shape) of the opaque film 2 and the transparent film 3 is referred to as “circumferential thermal contraction rate”, and the opaque film 2 and the transparent film are transparent. The thermal contraction rate in each second direction of the film 3 (the second direction corresponds to the longitudinal direction when the film is formed into a tubular shape) is referred to as “vertical thermal contraction rate”.
The circumferential heat shrinkage at 90 ° C. of the opaque film 2 is preferably as large as possible, and theoretically less than 100%. However, the circumferential heat shrinkage is usually 80% or less because it has its own limit. It is.
The opaque film 2 may be a film thermally changing in the second direction. When the opaque film 2 is a film thermally changing in the second direction, the longitudinal thermal contraction rate is, for example, -3 to 15%, preferably 1 to 10%. The minus of the longitudinal thermal shrinkage means thermal elongation.
However, in the present specification, the heat shrinkage ratio is the length (original length) of the film before heating (under an atmosphere of 23 ° C.) and the length of the film after being immersed in warm water of a predetermined temperature for 10 seconds ( It is specified by the ratio with the length after immersion, and is obtained by substituting them into the following formula 1 or formula 2. For example, the thermal contraction rate at 90 ° C. is immersed in warm water at 90 ° C. for 10 seconds, and the length after immersion is measured.
Equation 1: circumferential thermal contraction rate (%) = [{(original length in first direction) − (length after immersion in first direction)} / (original length in first direction) × 100.
Equation 2: longitudinal thermal contraction 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 of the opaque film 2 at 80 ° C. is smaller than the circumferential heat shrinkage at 90 ° C. The circumferential heat shrinkage of the opaque film 2 at 100 ° C. is the circumferential heat at 90 ° C. Greater than contraction rate. When the opaque film 2 is a film thermally changing in the second direction, the longitudinal thermal shrinkage at 80 ° C. is smaller than the longitudinal thermal shrinkage at 90 ° C., and the longitudinal thermal shrinkage at 100 ° C. is 90 Greater than the longitudinal heat shrinkage in ° 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. The circumferential heat shrinkage of the opaque film 2 at 100 ° is 90%. It is 3% to 15% greater than the circumferential heat shrinkage in ° C. The thermal contraction rate of the opaque film 2 rises in response to the temperature rise at least in the range of 80 ° C. to 100 ° C.

The opaque film 2 may optionally be provided with any appropriate functional layer such as, for example, a design print layer, a barrier layer, a surface protective layer, a sliding layer (these functional layers are not shown). . Although these functional layers do not usually have heat shrinkability, they do not inhibit the heat shrinkage of the opaque film 2. These functional layers are formed, for example, by a printing method, and each have a thickness of about 0.5 μm to 10 μm.
The design print layer is a print layer representing the design of any characters, symbols, patterns and the like, and includes a non-patterned print layer printed on the background of the display of characters and the like. The design print layer is formed by one-color ink or multi-color printing using two or more colors of ink. Usually, a design print layer is provided on the surface side of the opaque film 2 in order to make the design visible from the surface side of the heat-shrinkable cylindrical label 1. The design print layer may be provided on the back side of the opaque film 2.

The barrier layer is a layer that mainly imparts at least one of the gas barrier property and the light barrier property to the film, and is preferably a layer that imparts the gas barrier property. As a layer which provides light barrier property, a white printing layer, a black-based printing layer, a silver printing layer etc. are mentioned, for example. These are provided singly or in combination of two or more on the back surface of the film. 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 illustrated.
The surface protective layer is provided on the outermost surface of the opaque film 2 and is a layer that prevents the label from being scratched.
The sliding layer is provided on the outermost surface of the opaque film 2 and is a layer for improving the sliding when the heat-shrinkable cylindrical label 1 is attached to the adherend with an attaching 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.
The transparent film 3 itself has heat shrinkability in at least the first direction (the first direction corresponds to the circumferential direction when the film is formed in a cylindrical shape) in terms of thermal properties. Moreover, the transparent film 3 itself is transparent from an optical viewpoint.

  The transparent film 3 is not particularly limited as long as it has at least heat shrinkability 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 and 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 in view of the material, and polyester resins such as polyethylene terephthalate and polylactic acid; olefin resins such as polyethylene, polypropylene and cyclic olefin; polystyrene such as polystyrene and styrene-butadiene copolymer Polyamide-based resins; those having a mixture of one or more selected from thermoplastic resins such as vinyl chloride-based resins as a 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 one of the thicknesses may be smaller than the other. The thickness of the transparent film 3 is preferably equal to or smaller than the thickness of the opaque film 2 from the viewpoint of effectively preventing the occurrence of wrinkles, and the thickness of the opaque film 2-thickness of the transparent film 3 is 0 to 20 μm Is more preferred.

  The transparent film 3 is obtained by a known film forming method. For example, a resin composition containing a synthetic resin and various additives as required is mixed by a mixer or the like, melted using an extruder, extruded from a T-die, and drawn and heat-set, A transparent film 3 can be obtained. The stretching process 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., and is stretched about 2.0 to 8.0 times, preferably about 3.0 to 7.0 times in the first direction (for example, the TD direction during film formation) It is done by doing. Furthermore, if necessary, the stretching treatment may be performed at a low magnification of, for example, 1.5 or less in the second direction (for example, the MD direction at the time of film formation). The heat treatment can be imparted to the film by the stretching treatment.

  In the present invention, the circumferential heat shrinkage 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 of the opaque film 2 in the range of 80 ° C. to 100 ° C. small. That is, at all temperatures within the range of 80 ° C. to 100 ° C., the circumferential thermal shrinkage of the transparent film 3 is equal to or less than the circumferential thermal shrinkage 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 stretching ratio, the temperature of heat setting, 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 not more than the circumferential heat shrinkage rate of the opaque film 2 at 90 ° C., but preferably 30% or more, more preferably It is 40% or more, more preferably 45% or more. The circumferential heat shrinkage rate of the transparent film 3 at 90 ° C. is preferably as large as possible, and theoretically less than 100%, but the circumferential heat shrinkage rate is usually 80% or less because it has its own limit. is there. The transparent film 3 may be a film thermally changing in the second direction. In the case where the transparent film 3 is a film thermally changing in the second direction, the longitudinal thermal contraction rate is, for example, -3 to 15%, preferably 1 to 10%.
The circumferential thermal contraction rate and the longitudinal thermal contraction rate of the transparent film 3 can be determined in the same manner as those of the opaque film 2.

The circumferential heat shrinkage rate of the transparent film 3 at 80 ° C. is smaller than the circumferential heat shrinkage rate of the transparent film 3 at 90 ° C. The circumferential heat shrinkage rate of the transparent film 3 at 100 ° C. Greater than the circumferential heat shrinkage at 90 ° C. When the transparent film 3 is a film thermally changing in the second direction, the longitudinal thermal contraction rate at 80 ° C. is smaller than the longitudinal thermal contraction rate at 90 ° C., and the longitudinal thermal contraction rate at 100 ° C. is 90 Greater than the longitudinal heat shrinkage in ° C.
The circumferential thermal shrinkage of the transparent film 3 at 80 ° C. is, for example, 3% to 15% smaller than the circumferential thermal shrinkage at 90 ° C. The circumferential thermal shrinkage of the transparent film 3 at 100 ° C. is 90 It is 3% to 15% greater than the circumferential heat shrinkage in ° C. The thermal contraction rate of the transparent film 3 rises in response to the temperature rise at least in the range of 80 ° C. to 100 ° C.

The difference between the circumferential heat shrinkage of the opaque film 2 at 80 ° C. and the circumferential heat shrinkage 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 twice or less, preferably 1.5 times or less, the circumferential heat shrinkage rate of the transparent film 3 at 80 ° C., more preferably 1. Less than three 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 twice or less, preferably 1.5 times or less, of the circumferential heat shrinkage rate of the transparent film 3 at 90 ° C., more preferably 1. Less than three 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 twice or less, preferably 1.5 times or less, the circumferential heat shrinkage rate of the transparent film 3 at 100 ° C., more preferably 1. Less than three times.
The difference between the circumferential heat shrinkage ratio of the opaque film 2 in the range of 80 ° C. to 100 ° C. and that in the range of 80 ° C. to 100 ° C. of the transparent film 3 is preferably as small as possible for the same reason . For example, the circumferential heat shrinkage rate of the opaque film 2 in the range of 80 ° C. to 100 ° C. is twice or less the circumferential heat shrinkage rate of the transparent film 3 in the range of 80 ° C. to 100 ° C., preferably 1.5. It is twice or less, more preferably 1.3 times or less.

Similar to the opaque film 2, the transparent film 3 may be provided with any appropriate functional layers, such as a design print layer, a barrier layer, a surface protective layer, a sliding layer, etc. Functional layer is not shown). Although these functional layers do not usually have heat shrinkability, they do not inhibit the heat shrinkage of the transparent film 3. These functional layers are formed, for example, by a printing method, and each have a thickness of about 0.5 μm to 10 μm.
When providing a design print layer on the transparent film 3, the design print layer is provided to the extent that the function as a transparent portion is not impaired. As 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 numerical indication 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 cylindrical label]
As shown in FIGS. 1 to 3, the heat-shrinkable cylindrical label 1 comprises an opaque film 2 rounded into a substantially cylindrical shape, and a transparent film 3 interposed between both end portions of the opaque film 2. And transparent portions 4 are provided between both end portions 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 ends of the substantially cylindrical opaque film, and the transparent film 3 is interposed in the gap, so that the transparent portion 4 made of the transparent film 3 is configured therebetween. It is done. In the transparent portion 4, the back side (and the front side from the back side) can be visually recognized from the front side of the label.

Both the opaque film 2 and the transparent film 3 have the first direction as a circumferential direction. Accordingly, both the opaque film 2 and the transparent film 3 constituting the heat-shrinkable cylindrical label 1 have heat-shrinkability in the circumferential direction, and the heat-shrinkable cylindrical label 1 is entirely heated when heated to a predetermined temperature. Heat shrinks.
The circumferential length of the opaque film 2 with respect to the circumferential length of the heat-shrinkable cylindrical label 1 is appropriately set, but if the ratio occupied by the opaque film 2 is too small, the cylindrical label having excellent concealability can not be formed. When it is large, the proportion of the transparent portion relatively decreases. From this point of view, the circumferential length of the opaque film 2 is preferably the circumferential length of the heat-shrinkable cylindrical label 1 × 0.85, and the circumferential length of the heat-shrinkable cylindrical label 1 × 0.99. The circumferential length x 0.9 of the cylindrical label 1 to the circumferential length x 0.97 of the heat-shrinkable cylindrical label 1 is more preferable. The circumferential length of the transparent portion 4 (corresponding to the width C of the transparent portion 4 described later) corresponds to the circumferential length of the heat-shrinkable cylindrical label 1-the circumferential length of the opaque film 2. The circumferential length refers to the length in the circumferential direction.

  The circumferential first side end 31 of the transparent film 3 is superimposed on the circumferential first side 21 of the opaque film 2, and the circumferential second side 32 of the transparent film 3 is the opaque film 2. A circumferential center portion of the transparent film 3 does not have the opaque film 2, which is overlapped with the circumferential second side end 22. The circumferential direction central portion of the transparent film 3 is a transparent portion 4 in which the back side can be viewed from the front side. The transparent portion 4 extends in a strip shape in the longitudinal direction. In the illustrated example, the transparent portion 4 is in the form of a strip extending longitudinally from the upper edge to the lower edge of the heat-shrinkable cylindrical label 1. The width of the transparent portion 4 may be uniform in the vertical direction or may be uneven. In the non-uniform case, for example, when the width of the transparent portion 4 has a portion (or a portion becoming larger) which gradually decreases from the upper side to the lower side, the width of the transparent portion 4 is a part in the vertical direction And the case where the region is locally smaller (or larger) than the other portions. In the illustrated example, the transparent portion 4 has an even width over the entire longitudinal direction.

  The back surface of the first side end 21 of the opaque film 2 may be superimposed on the surface of the first side end 31 of the transparent film 3, or the transparent film 3 may be formed on the surface of the first side end 21 of the opaque film 2. The back surface of the first side end 31 may be overlapped. Similarly, the back surface of the second side end 22 of the opaque film 2 may be superimposed on the surface of the second side end 32 of the transparent film 3 or transparent to the surface of the second side end 22 of the opaque film 2 The back surface of the second side end 32 of the film 3 may be overlapped. In the illustrated example, the back surface of the first side end 21 of the opaque film 2 is superimposed on the surface of the first side end 31 of the transparent film 3, and the opaque film is formed on the surface of the second side end 32 of the transparent film 3. The back surfaces of the second side end portions 22 are overlapped.

The transparent film 3 and the opaque film 2 are respectively adhered in a strip shape in the longitudinal direction at the portions where the both side 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, bonding may be performed using a solvent, or bonding may be performed using an adhesive or a double-sided adhesive tape. Good. The illustrated example is the case of solvent bonding, in which case, as shown in FIG. 3, the opaque film 2 and the transparent film 3 are directly bonded.
The bonding may be the entire circumferential direction of the overlapped portion, or may be a circumferential portion of the portion. It is bonded including the side edge of the film located on the outside from the point of preventing curling and the like. In the illustrated example, a portion near the first side edge of the first side edge 21 of the opaque film 2 including the first side edge 21 a is bonded to the first side edge 31 of the transparent film 3, and The second side edge 22 and its vicinity including the second side edge 22a of the second side edge 22 are bonded to the second side edge 32 of the transparent film 3 (see FIG. 3). Accordingly, of the first side end 31 and the second side end 32 of the transparent film 3, the first side edge 31 near the first side edge 31 a and the second side edge 32 a including the second side edge 32 a Each is a non-adhesive free piece not adhered to the opaque film 2.

  The bonding width at the first side end 21 and 31 and the bonding width at the second side end 22 and 32 are not particularly limited, but since the bonded part is difficult to thermally shrink, the width should be as small as possible preferable. On the other hand, if the bonding width is too small, the opaque film 2 and the transparent film 3 may be separated carelessly. From this point of view, the adhesion width A1 at the first side end 21 or 31 and the adhesion width A2 at the second side end are each independently preferably 2 mm to 10 mm, and more preferably 3 mm to 7 mm. In addition, 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 parts are not particularly limited, but they are preferably 5 mm or less, more preferably 4 mm or less, because if they are too large, there is a risk that the non-adhesion free piece part may bend when attached to the adherend. In the case where the bonding widths are not uniform in the vertical direction, the bonding widths A1 and A2 mean their maximum values.

Also, the width of the transparent portion 4 (in the illustrated example, the distance between the facing first side edge 21a and the second side edge 22a of the opaque film 2) is not particularly limited, but if too small, the significance of providing the transparent portion 4 is On the other hand, if it is too large, the concealability of the heat-shrinkable tubular label 1 is reduced. 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. In addition, when the said transparent part 4 is not uniform in the vertical direction, the width | variety of the said transparent part 4 shall mean the maximum value.
In addition, the "width" of each said part says the length in the circumferential direction.
Thus, the transparent heat-shrinkable cylindrical label 1 partially having the transparent portion 4 is configured by connecting the transparent film 3 between both end portions of the opaque film 2.

  The heat-shrinkable cylindrical label 1 may be provided with conventionally known configurations such as a perforation for opening, a slit for opening, and the like. In addition, the heat-shrinkable cylindrical label 1 may be added with other conventionally known members such as a peelable adhesive seal and a POP label.

[Production of heat-shrinkable cylindrical label]
The heat-shrinkable cylindrical label 1 can be manufactured, for example, as follows.
As shown in FIG. 4, at the first side end of the long strip-like opaque film raw fabric 51 having heat shrinkability in the short side direction, a long strip-like transparent film raw fabric having heat shrinkability in the short direction A long film 53 is formed, to which the first end of 52 is adhered. The second side end portion of the transparent film original fabric 52 is made of a solvent or the like at the second side end portion of the opaque film original fabric 51 while rounding the long film 53 with the short direction of the long film 53 as a circumferential direction. By bonding them, a long heat-shrinkable cylindrical label continuum 54 is obtained. The heat-shrinkable cylindrical label 1 is obtained by cutting the continuous body 54 at a predetermined length.

[Use example of heat-shrinkable cylindrical label]
The heat-shrinkable cylindrical label 1 of the present invention is heat-shrinkably attached to an adherend as in the prior art.
The adherend is not particularly limited, and may be a container filled with the contents, or an article itself such as a toy or a machine part. The heat-shrinkable cylindrical label 1 of the present invention may be attached so as to bind a plurality of adherends.
The heat-shrinkable cylindrical label 1 of the present invention having the transparent portion 4 is preferably attached to a container having a transparent portion. The container may be substantially entirely transparent, partially transparent and partially opaque. Preferably, the heat shrinkable tubular label 1 is mounted on a container having a container body that is totally transparent.

For example, as shown in FIG. 5, the container 7 is provided above the transparent body 71 and the body 71 and is provided above the transparent shoulder 72 and the shoulder 72 whose diameter is reduced toward the upper side. It has the container main body 73 which has a pouring outlet (not shown), and the opaque lid part 74 which opens and closes a pouring outlet.
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 main body 73 is not particularly limited in view of the material thereof, and may be synthetic resin, glass or the like. The contents to be filled in the container 7 are not particularly limited, and include cosmetics, medicines, beverages such as juices, seasonings such as edible oils and soy sauces, foods, sanitary products such as liquid detergents and shampoos for refilling .
For example, after the heat-shrinkable cylindrical label 1 is packaged in the container 7 such that the transparent portion 4 of the heat-shrinkable cylindrical label 1 covers the transparent portion of the container 7, the heat-shrinkable cylindrical shape is formed by heating A labeled container 9 is obtained in which the label 1 is attached to the container 7 (see FIG. 6).
Although the heat treatment is not particularly limited, it is preferable to carry out the heat treatment in a temperature range in which the temperature of the heat-shrinkable cylindrical label 1 is 85 ° C to 100 ° C, preferably 90 ° C to 97 ° C. As a heating method, for example, a method of passing through a hot air tunnel or a steam tunnel, a method of heating by radiant heat such as infrared rays, and the like can be mentioned. 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 cylindrical label 1 is heat-shrinkably attached to the whole of the body 71 and the shoulder 72 and the lid 74 (so-called full shrink). The heat-shrinkable cylindrical label 1 having excellent concealability is mounted on the entire transparent portion of the container body 73 except for the bottom of the container 7. For this reason, the contents in the container 7 are less likely to be deteriorated by ultraviolet light and the like. In addition, since the heat-shrinkable cylindrical label 1 is provided with the transparent portion 4 (transparent film 3) extending in the longitudinal direction from the upper edge to the lower edge, the condition of the contents is determined through the transparent portion 4 Visible from outside.
In the heat-shrinkable cylindrical label 1 of the present invention, the transparent film 3 having a circumferential thermal shrinkage in the range of 80 ° C. to 100 ° C. is the same as or smaller than the circumferential thermal shrinkage in the same temperature range of the opaque film 2 Since it is used, it is hard to produce wrinkles and can be heat-shrinkably attached to a to-be-adhered body beautifully.

  In addition, since the transparent film 3 has heat shrinkability in the circumferential direction, the highly shrinkable portion of the heat shrinkable tubular label 1 (relatively depending on the heat shrink mounting condition of the heat shrinkable tubular label 1 to the container 7) In some cases, the width of the transparent portion 4 may be smaller than that of the low shrinkage portion (a relatively small shrinkage portion). For example, in the example shown in FIG. 6, of the heat-shrinkable cylindrical label 1, the portion attached to the shoulder portion 72 and the lid portion 74 of the container 7 is a highly contracted portion, a portion attached to the trunk portion 71 of the container 7 However, the transparent portion 4 corresponding to the high shrinkage portion may have a smaller width as shown in the drawing.

  Furthermore, since the heat-shrinkable cylindrical label 1 of the present invention uses the opaque film 2 having heat-shrinkability in the circumferential direction and the transparent film 3 having the heat-shrinkability in the circumferential direction, the lid 74 of the container 7 is used. A portion extending from the top surface of the container to the longitudinal direction, a portion extending from the top surface to the side surface of the lid 74 of the container 7 (corner of the lid 74) and a portion extending from the bottom of the container 7 to the trunk 71 (container body It is hard to cause floating (so-called horning) that occurs on the bottom corner portion of 73, and the heat-shrinkage can be carried out beautifully.

[Modification]
The present invention is not limited to the above, and various design changes can be made within the intended scope of the present invention. Hereinafter, terms and symbols may be used for the same configuration as the configuration of the above embodiment, and the description thereof may be omitted.
In the heat-shrinkable cylindrical label 1 of the illustrated example, the first side end 21 of the opaque film 2 is formed on the surface of the first side end 31 and the surface of the second side end 32 of the transparent film 3. The back surface and the back surface of the second side end 22 are superposed and bonded in whole or in part.
For example, as shown in FIG. 7, the back surface of the first side end 31 and the second side end 32 of the transparent film 3 on the surface of the first side end 21 and the surface of the second side end 22 of the opaque film 2. The back side of the may be superimposed and bonded in whole or in part. Thus, when the transparent film 3 is disposed on the front side, it is preferable that the transparent film 3 be adhered including the first side edge 31 a and the second side edge 32 a of the transparent film 3 which are the side edges of the film located outside. . For example, a portion near the first side edge of the first side end 31 of the transparent film 3 including the first side edge 31 a is bonded to the first side end 21 of the opaque film 2 and the second side of the transparent film 3 The second side edge portion of the side end portion 32 including the second side edge 32 a is adhered to the second side end portion 22 of the opaque film 2. In this case, of the first side end 21 and the second side end 22 of the opaque film 2, the vicinity of the first side edge including the first side edge 21 a and the vicinity of the second side edge including the second side edge 22 a But become a non-adhesive free piece.

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

  Alternatively, as shown in FIG. 9A, the heat-shrinkable cylindrical label 1 may be attached to a bottle-shaped container 7. Furthermore, in the labeled container 9 of the illustrated example, the whole of the transparent portion of the container main body 73 (except the bottom) is covered with the heat-shrinkable cylindrical label 1, for example, as shown in FIG. 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 coated with the heat-shrinkable cylindrical label 1. The heat-shrinkable cylindrical label 1 may be attached to a container 7 having a winding portion 75 (a diameter-reduced portion) in the middle of the trunk portion 71 as shown in FIG.

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

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

[Measurement of heat shrinkage rate]
The thermal contraction rate (circumferential thermal contraction rate) of the opaque film and the transparent films (1) to (8) in the first direction was measured.
Specifically, for each of the opaque film and the transparent films (1) to (8), the sample piece is cut by cutting the length in the first direction (main heat shrinkage direction) × the length in the second direction = 50 mm × 50 mm. Made. The sample piece was allowed to stand at normal temperature (about 23 ° C.) under normal pressure, and then the length of the sample piece in the first direction was measured. Next, after immersing the sample piece in warm water of 80 ° C. for 10 seconds, the length in the first direction was measured immediately. The length before and after immersion was substituted in the above-mentioned formula 1, and the thermal contraction rate (circumferential thermal contraction rate) in the first direction at 80 ° C. was determined.
The temperature of the warm water is changed to 90 ° C. and 100 ° C., and similarly, the heat shrinkage rate in the first direction at 90 ° C. and 100 ° C. of the opaque film and the transparent films (1) to (8) respectively Asked for). The results are shown in Table 1 and FIG.
In addition, it is about 10% or less when the heat contraction rate (vertical direction heat contraction rate) of the opaque film and the transparent films (1) to (8) in the second direction at 80 ° C. is also measured for reference. The

Example 1
An opaque film and a transparent film (1) were used. By bonding the surfaces of both ends of the transparent film using a solvent to the back side of both ends of the opaque film rounded in a cylindrical shape, while making the first direction of each film be a circumferential direction, A heat-shrinkable cylindrical label as shown in FIGS. 1 to 3 was produced.
The longitudinal direction length of this heat-shrinkable cylindrical label was 140 mm, and the circumferential length was 96 mm. Further, referring to FIG. 3 (b), the adhesive widths A1 and A2 of the heat-shrinkable cylindrical label are both 3 mm, the widths B1 and B2 of the non-adhesive free piece are both 4 mm, and the width C of the transparent part. Was 6 mm.

[Examples 2 to 5, Comparative Examples 1 to 3]
A heat-shrinkable cylindrical 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).

[Attachment test]
A commercially available polyethylene terephthalate transparent container having a shape as shown in FIG. 5 was prepared.
The heat-shrinkable cylindrical labels obtained in Examples 1 to 5 and Comparative Examples 1 to 3 are packaged in this container, and the heat-shrinkable cylindrical labels are inserted into a steam tunnel and the steam is applied from the outside of the heat-shrinkable cylindrical labels. The heat-shrinkable cylindrical label was thermally shrunk by performing heat treatment in contact for a second. Thus, a labeled container (so-called full shrink) was produced in which the heat-shrinkable cylindrical label as shown in FIG. 6 was heat-shrinkably attached to the entire body and shoulders except the bottom and the lid.

About the obtained labeled container, the mounting | wearing finish (especially finish of transparent film vicinity) of the heat-shrinkable cylindrical label was confirmed.
The heat-shrinkable cylindrical labels of Examples 1 to 5 were beautifully attached in appearance, and no generation of wrinkles could be confirmed by touching the vicinity of the transparent film with a hand.
The heat-shrinkable cylindrical labels of Comparative Examples 1 to 3 all have wrinkles extending in the longitudinal direction, and horns on the corner portions of the lid portion and the bottom corner portion of the container body occur. I was able to confirm clearly by appearance.

Thus, Examples 1 to 5 using a transparent film whose circumferential heat shrinkage in the range of 80 ° C. to 100 ° C. is the same as or smaller than that of the opaque film had a good shrink finish.
On the other hand, Comparative Example 1 using a transparent film having a larger thermal contraction rate in the circumferential direction than the opaque film at 90 ° C. to 100 ° C., a transparent film having a thermal contraction rate larger in the circumferential direction than the opaque film at 80 ° C. to 100 ° C. Comparative Example 2 The finish was poor in all of Comparative Example 3 using a transparent film having a circumferential direction thermal contraction rate larger than that of the opaque film at 80 ° C. to 90 ° C.

DESCRIPTION OF SYMBOLS 1 heat-shrinkable cylindrical label 2 opaque film 21 1st side edge part of opaque film 22 2nd side edge part of opaque film 3 transparent film 31 1st side edge part of transparent film 32 2nd side edge part of transparent film 4 Transparent part

Claims (4)

In a heat-shrinkable cylindrical label partially formed with a transparent portion and having heat-shrinkability in the circumferential direction,
An opaque film having heat shrinkability in the circumferential direction of the label, and a transparent film having heat shrinkability in the circumferential direction of the label, the transparent film being connected between both ends of the opaque film and having the transparent portion therebetween Transparent film, and
A heat-shrinkable cylinder, wherein the circumferential heat shrinkage in the range of 80 ° C. to 100 ° C. of the transparent film is the same as or smaller than the circumferential heat shrinkage of the opaque film in the range of 80 ° C. to 100 ° C. Label.   The thermal contraction rate in the circumferential direction in the range of 80 ° C. to 100 ° C. of the opaque film is twice or less the thermal contraction rate in the circumferential direction in the range of 80 ° C. to 100 ° C. of the transparent film. Shrinkable cylindrical label.   The heat-shrinkable cylindrical label according to claim 1, wherein the opaque film itself is opaque.   The heat-shrinkable cylindrical label according to any one of claims 1 to 3, wherein the opaque film is a film exhibiting a milky white color.

Images