JP4969321B2 - Heat-shrinkable cylindrical label - Google Patents

Description

  The present invention relates to a heat-shrinkable cylindrical label that is heat-shrinked and attached to a container.

Conventionally, heat-shrinkable cylindrical labels (also called cylindrical shrinks, shrink films, etc.) are attached to various containers such as beverage containers and food containers.
Such a heat-shrinkable cylindrical label is composed of a tubular body obtained by forming a heat-shrinkable base film provided with a design printing layer into a tubular shape. Furthermore, a sliding layer is provided on the inner surface of the cylindrical body in order to reduce the dynamic frictional resistance when the heat-shrinkable cylindrical label is fitted on the container. The sliding layer is formed, for example, by applying a medium ink containing a lubricant on the innermost surface (container contact surface) of the base film in a solid shape.

However, the heat-shrinkable cylindrical label provided with a sliding layer on the inner surface has a screw cap that rotates in the circumferential direction of the body and opens and closes the cap, and the stored items are enclosed in a state higher than atmospheric pressure. When it is attached to a container, there is a problem that the screw cap rotates freely when the screw cap is turned.
Specifically, a synthetic resin flexible container (for example, made of polyethylene terephthalate) having a barrel portion, a spout opening above the barrel portion, and a screw cap for opening and closing the spout. A bottle-shaped container or the like) is opened and closed by holding the barrel with one hand and turning the screw cap in the circumferential direction of the barrel with the other hand. Among these, since the internal pressure is in a state higher than the atmospheric pressure, the body portion of the container in which the pressurizing stored item such as carbonated drink is enclosed is slightly expanded. Therefore, when the internal pressure is reduced when the container is opened, the body of the container is restored and becomes slightly smaller. The diameter of the heat-shrinkable cylindrical label attached to the body of such a container is unchanged regardless of the opening / closing stopper. For this reason, when the container is restored and its diameter is reduced, there is a problem that when the screw cap is turned, the cylindrical label is idle with respect to the body portion. Thus, when the heat-shrinkable cylindrical label is idle, the screw cap cannot be easily opened and closed, and an improvement is desired.

  In order to prevent the heat-shrinkable cylindrical label from spinning around, a heat-shrinkable cylindrical label partially coated with a heat-sensitive adhesive is applied to the container contact surface of the heat-shrinkable cylindrical label laminated on the inner surface. Known (Patent Document 1).

However, applying a heat-sensitive adhesive to the container contact surface is not preferable in recycling the container because the heat-sensitive adhesive remains in the container after the cylindrical label is removed. Moreover, when the cylindrical label provided with the heat sensitive adhesive is flattened, there is a possibility that a phenomenon (blocking) in which the inner surfaces of the cylindrical label adhere to each other may occur.
JP 2002-20705 A

  Therefore, the present invention relates to a heat-shrinkable cylindrical label attached to a flexible container in which a stored item is sealed in a state higher than atmospheric pressure. The problem is to prevent idling.

  The present invention is a flexible container made of a synthetic resin having a trunk portion and a screw cap capable of opening and closing a spout, and in which a stored item is sealed in a state higher than atmospheric pressure, A heat-shrinkable base film having a sliding layer on the inner surface of a heat-shrinkable cylindrical label attached to the barrel of a container whose thickness is thinner than the thickness below the barrel A blocking part in which a polymer that can be softened at the heat shrink temperature of the base film is applied to a part of the inner surface of the cylindrical body corresponding to the lower part of the body of the container, or Provided is a heat-shrinkable cylindrical label provided with at least one of blocking parts from which a base film is exposed.

Since the above-mentioned heat-shrinkable cylindrical label is provided with a sliding layer on the inner surface, when it is externally fitted to the body of the container, the inner surface of the heat-shrinkable cylindrical label slides smoothly with respect to the outer surface of the container. The sticky cylindrical label can be reliably positioned at a predetermined position of the container.
By heating the heat-shrinkable cylindrical label after external fitting, the heat-shrinkable cylindrical label is heat-shrink mounted on the container.
The heat-shrinkable cylindrical label is a blocking part in which a polymer that can be softened at the heat-shrinking temperature of the base film is applied to a part of the inner surface corresponding to the lower part of the body part of the container, or a blocking in which the base film is exposed. Since either one of the parts is provided, when the heat-shrinkable cylindrical label is heated, the polymer application part or the exposed part of the base film is softened, and this blocking part is below the trunk part of the synthetic resin container. Strongly adheres to the outer surface. A container in which the lower portion of the body is formed thicker than the center of the body has little or very little change in diameter under the body when opened. For this reason, at the time of opening, the state in which the blocking part closely adhered to the outer surface below the trunk part can be maintained. Therefore, it is possible to prevent the heat-shrinkable cylindrical label from spinning around when the container with the label attached is opened and closed.

  Furthermore, the present invention is a flexible container made of a synthetic resin having a body portion and a screw cap capable of opening and closing a spout, and in which a stored item is enclosed in a state higher than atmospheric pressure, The circumferential length below the trunk after opening the cap is reduced to 0.980 to 1.000 times the same circumferential length before opening, and the middle of the trunk after opening the screw cap. The heat-shrinkable cylindrical label attached to the barrel of the container whose circumference is reduced to be larger than the reduction ratio of the circumference under the barrel, the heat-shrinkability provided with a sliding layer on the inner surface The blocking part has a cylindrical body formed by cylindrically forming the base film, and a polymer that can be softened at the heat shrink temperature of the base film is applied to a part of the inner surface of the cylindrical body corresponding to the lower part of the container body Or at least one of the blocking portions exposing the base film is provided. Providing NetsuOsamu shrinkable tubular label has.

Similarly, when the heat-shrinkable cylindrical label is externally fitted to the body of the container, the inner surface of the heat-shrinkable cylindrical label smoothly slides with respect to the outer surface of the container, and the heat-shrinkable cylindrical label is moved to a predetermined position on the container. Can be reliably positioned.
When the heat-shrinkable cylindrical label is heat-shrink mounted, the blocking portion softens, and this portion strongly adheres to the outer surface below the trunk portion of the synthetic resin container. The above-mentioned container in which the reduction ratio before and after opening is larger in the middle of the trunk part than in the lower part of the trunk part has a very small diameter change in the lower part of the trunk part. For this reason, at the time of opening, the state in which the blocking part closely adhered to the outer surface below the trunk part can be maintained. Therefore, it is possible to prevent the heat-shrinkable cylindrical label from spinning around when the container with the label attached is opened and closed.

  The present invention also includes a barrel and a screw cap capable of opening and closing the spout, and the barrel of a flexible container made of a synthetic resin in which a stored item is sealed in a state higher than atmospheric pressure. In the heat-shrinkable cylindrical label to be installed, the heat-shrinkable base film with a sliding layer on the inner surface is overlapped with one side end on the outer surface of the other end and center-sealed. A non-adhesive margin is secured at one side edge between the side edge of the other edge of the base film and the center seal, and the base film is placed on the inner surface of the margin. Provided is a heat-shrinkable cylindrical label provided with at least one of an exposed blocking portion or a blocking portion coated with a polymer that can be softened at the heat shrink temperature of a base film.

Similarly, when the heat-shrinkable cylindrical label is externally fitted to the body of the container, the inner surface of the heat-shrinkable cylindrical label smoothly slides with respect to the outer surface of the container, and the heat-shrinkable cylindrical label is moved to a predetermined position on the container. Can be reliably positioned.
The heat-shrinkable cylindrical label has a non-adhesive margin at one end at the center seal portion, and a polymer that can be softened at the heat shrink temperature of the base film is applied to the inner surface of the margin. At least one of the processed blocking part or the blocking part exposing the base film is provided. When the heat-shrinkable cylindrical label is heated, the remainder is strongly pressed toward the outer surface side of the container by the contraction of the one end portion of the base film overlapped on the outside, and the blocking portion is softened. When the softening margin of the blocking portion is pressed against the container, this portion strongly adheres to the outer surface of the body portion of the synthetic resin container. This blocking part may be provided in the entire remainder (a strip shape from the upper edge to the lower edge of the cylindrical label) or may be provided partially in the remainder. When the blocking portion is provided in the entire remainder, even if the heat-shrinkable cylindrical label is attached to a container having a barrel center that is relatively greatly reduced when opened, the blocking portion is not attached to the container. It is possible to maintain a tightly adhered state at the upper and lower portions of the trunk. Therefore, it is possible to prevent the heat-shrinkable cylindrical label from spinning around when the container with the label attached is opened and closed.

  As the container, the heat-shrinkable cylindrical label is attached to a container in which a plurality of concave parts recessed inwardly at the lower part of the body part are formed at predetermined intervals in the circumferential direction of the body part.

  The heat-shrinkable cylindrical label of the present invention is attached to a flexible container in which stored items are enclosed in a state higher than atmospheric pressure. Since the heat-shrinkable cylindrical label partially adheres to the container, the heat-shrinkable cylindrical label can be prevented from spinning when the container is opened and closed.

Hereinafter, the present invention will be specifically described with reference to the drawings. However, for convenience, as a term indicating a direction, “outside” indicates a side away from the center of the container to be mounted, and “inside” indicates a side close to the center of the container. Further, “upper” refers to the side away from the bottom surface of the container to be mounted, and “lower” refers to the side closer to the bottom surface of the container.
<First Embodiment>
1 and 2, reference numeral 1 denotes a heat-shrinkable cylindrical label comprising a tubular body having a heat-shrinkable base film 31 formed into a tubular shape. The heat-shrinkable cylindrical label 1 is mounted around at least a trunk portion of a synthetic resin-made flexible container 2 in which a stored item is sealed in a state higher than atmospheric pressure. The container 2 is shown in FIG.
The heat-shrinkable cylindrical label 1 is provided with a sliding layer 33 on the inner surface (container contact surface) and a blocking portion 7 that is in close contact with the outer surface of the body portion of the container 2.

Specifically, the heat-shrinkable cylindrical label 1 is formed by superimposing one end portion 3a of the label base material 3 on the outer surface of the other end portion 3b and performing center sealing (adhesion) using a solvent or an adhesive. It consists of the cylindrical body shape | molded by this.
As shown in FIG. 2, in the center seal portion 4, a surplus margin 5 extending in the circumferential direction from the center seal portion 4 is secured at the other end 3 b of the label base material 3 positioned inside. ing. Specifically, the center seal portion 4 superimposes one side end portion 3a of the label base material 3 on the outer surface of the other side end portion 3b, and adheres a predetermined width of the overlapped region in the vertical direction. It is formed by. A predetermined width (for example, about 3 mm to 7 mm) and a margin of margin 5 are secured between the side edge 3 b ′ of the other end 3 b of the label base 3 and the edge of the center seal portion 4. The surplus margin 5 is a free end that is not bonded to the inner surface of the one side end 3a.
Since the inner surface of the predetermined width from the edge of the one side end portion 3a of the label base 3 is center-sealed to the outer surface of the other end portion 3b, the design print layer 32 or the like is not formed, and the base film 31 The inner surface is exposed.

  The label base material 3 is formed in a rectangular shape having a predetermined length that can be covered from the body portion 22 to the shoulder portion 23 of the container 2. As shown in FIG. 3, the label substrate 3 covers a base film 31 having heat shrinkability, a design printing layer 32 provided on the inner surface side of the base film 31, and at least an inner surface of the design printing layer 32. Thus, the sliding layer 33 provided on the inner surface side of the base film 31 and the blocking portion 7 provided on the inner surface side of the base film 31 are included.

  The base film 31 is not particularly limited as long as it has heat shrinkability in at least one direction (circumferential direction when formed into a cylindrical shape, hereinafter the same). For example, polyester-based resin such as polyethylene terephthalate, polypropylene Synthetic resins comprising one or a mixture selected from thermoplastic resins such as olefin resins such as cyclic olefins, styrene resins such as polystyrene and styrene-butadiene copolymers, and vinyl chloride resins A film or the like can be used. A laminated film in which two or more kinds of resins having heat shrinkability are laminated can also be used. Furthermore, the well-known laminated | multilayer film by which heat insulation layers, such as a foamed resin sheet, and another functional layer were laminated | stacked on the film which has heat-shrinkability can also be used. Especially, since the base film 31 is excellent in shrinkage stress, what contains a polyester-type and polyolefin-type film is preferable, and the thing containing a polyester-type film is especially preferable.

The heat-shrinkable film can be obtained by forming a film by a known manufacturing method and stretching the film. The stretching treatment is usually performed by main stretching at a temperature of about 70 to 110 ° C. in a direction of 2.0 to 8.0 times, preferably about 3.0 to 7.0 times. Furthermore, the stretching process may be performed at a low magnification of, for example, 1.5 times or less in the other direction (the direction orthogonal to the one direction. The vertical direction when formed into a cylindrical shape; the same applies hereinafter). The obtained film becomes a uniaxially stretched film or a biaxially stretched film slightly stretched in a direction orthogonal to the main stretch direction. Although the thickness of a film is not specifically limited, The thing of about 25-80 micrometers is used normally.
The heat shrinkage rate of the film can be appropriately designed according to the diameter difference between the body portion 22 and the shoulder portion 23 of the container 2 to be mounted. For example, the thermal shrinkage rate (immersion in 90 ° C. warm water for 10 seconds) in one direction of the film is about 40% or more, preferably about 50% or more. The film may be slightly heat-shrinked in the other direction, and the heat shrinkage rate (immersion in 90 ° C. warm water for 10 seconds) in the other direction is about −3 to 15%.
However, thermal shrinkage rate (%) = [{(original length in one direction (or other direction)) − (length after immersion in one direction (or other direction))} / (one direction (or other direction) ) Original length)] × 100.

The design printing layer 32 is formed on the base film 31 except for a predetermined range on the inner surface of the one side end portion 3a of the base film 31 serving as the center seal portion 4 and the inner surface of the base film 31 provided with the blocking portion 7 described in detail below. It is provided in a predetermined range on the inner surface. The design printing layer 32 is provided with display printing such as a predetermined display such as a product name, a pattern, and description, and solid printing such as white, for example, in a single color or multicolor printing by gravure printing or the like. However, the design print layer 32 may be provided in a solid shape over the entire predetermined range of the inner surface of the base film 31, or may be partially provided in the predetermined range.
The design print layer 32 is preferably provided on the inner surface of the base film 31, but may be provided on the outer surface of the base film 31.

The sliding layer 33 is provided in order to reduce the dynamic friction coefficient of the heat-shrinkable cylindrical label 1 with respect to the container 2. The sliding layer 33 is formed on the inner surface of the base film 31 except for a predetermined range of the inner surface of the one side end 3a of the base film 31 serving as the center seal portion 4 and the inner surface of the base film 31 provided with the blocking portion 7 described in detail below. It is provided in a solid shape on the entire side. Therefore, the inner surface of the design printing layer 32 is covered with the sliding layer 33.
The sliding layer 33 can be provided, for example, by applying a medium ink in the above range in a solid form. The medium ink is a transparent ink substantially free of a pigment (coloring material), and includes a polymer and a sliding component. Specifically, the medium ink is, for example, an emulsion type in which an acrylic resin, an acrylic copolymer, a polyester resin, a urethane resin, an aqueous polyamide resin, or the like is dispersed in water (and / or alcohol); toluene , Rosin, ketone resin, vinyl chloride resin, vinyl chloride-vinyl acetate copolymer, acrylic resin, urethane resin, acrylic-urethane copolymer, polyester in organic solvents such as methyl ethyl ketone, ethyl acetate, isopropyl alcohol For example, a solvent-type polymer solution in which a system resin or the like is dissolved is mixed with a sliding component. Examples of the slip component include lubricants such as waxes, silicone fine particles, inorganic fine particles such as silica, and organic fine particles. The medium ink may be mixed with other additives such as a thickener, an antifoaming agent and an antifungal agent, if necessary. Among them, the sliding layer 33 is made of acrylic resin or urethane resin as a base polymer, olefin wax such as polyethylene wax, fluorine wax such as tetrafluoroethylene resin (Teflon (registered trademark)), fluorine resin powder, silica. What contains 1-30 mass% (solid content ratio) of slip components, such as these, is preferable. In particular, it is more preferable that the acrylic resin contains 5 to 30% by mass (solid content ratio) of polyethylene wax.

The blocking part 7 is provided in order to make the heat-shrinkable cylindrical label 1 closely adhere to the container 2 (increase the friction coefficient). When the heat-shrinkable cylindrical label 1 is attached to the container 2, the blocking part 7 is partially provided at a position corresponding to the lower portion 22 a of the body 2 of the container 2.
Specifically, the blocking part 7 is formed in a belt-like region extending upward from the lower end edge of the cylindrical body. The vertical length H of the blocking portion 7 is not particularly limited, but if it is too short, depending on the mounting position on the container 2, the entire blocking portion 7 faces the recess 25 formed on the lower portion 22 a of the blocking portion, and blocking. It is also conceivable that the portion 7 does not adhere to the outer surface of the container 2. Therefore, it is preferable that the vertical length H of the blocking portion 7 is longer than the vertical length H1 of the recessed portion 25 shown in FIG. If the width W (circumferential length) of the blocking portion 7 is too short, it cannot be brought into close contact with the container 2 to obtain the effect of preventing idling, and can be designed as appropriate within the range where the effect is exhibited. As a specific example, when the heat-shrinkable cylindrical label 1 of the present invention is attached to a general-purpose 0.5-liter petaloid bottle-shaped container, the blocking portion 7 has a vertical length H of 30. -40 mm and width W are formed to be about 10-20 mm.

As a material for forming the blocking portion 7, a polymer that can be softened at the heat shrink temperature of the base film 31 can be used. Specifically, when the heat-shrinkable cylindrical label 1 is mounted on a container, it is heated in a steam tunnel having an atmospheric temperature of 80 to 100 ° C. or heated in a hot air tunnel that blows hot air of 150 to 250 ° C. Since there are many, the formation material of the blocking part 7 uses the polymer which can be softened by this heating system. As such a polymer, a polymer having a glass transition temperature (measured by DSC method) of 100 ° C. or less is preferably used.
As a forming material of the blocking part 7, the above-mentioned medium ink from which a slip component has been substantially removed can be used. Specifically, the blocking portion 7 is, for example, a polymer (emulsion type) that can be applied by being dispersed in water (and / or alcohol), such as an acrylic resin, an acrylic copolymer, a urethane resin, or a polyester resin. An emulsion type polymer such as an aqueous polyamide resin can be used. In addition, polymers applied by dissolving in organic solvents such as toluene, methyl ethyl ketone, ethyl acetate, isopropyl alcohol, such as acrylic resins, urethane resins, acrylic-urethane copolymers, polyester resins, ketone resins, vinyl chloride It can be formed using a solvent-type polymer such as a vinyl resin or a vinyl chloride-vinyl acetate copolymer. Among these, urethane resins and acrylic resins are preferable because they are easily softened at a relatively low temperature. Moreover, it is also preferable to use the same kind of polymer as the main forming material (synthetic resin) of the container as the forming material of the blocking portion 7.
The polymer is dissolved in water or a solvent to adjust to an appropriate viscosity to form a solution, and the solution is applied to a predetermined range on the inner surface of the base film 31 by a known printing method or the like, whereby the blocking portion 7 is formed. Can be formed.
Among the above polymers, it is more preferable to use an acrylic resin having a glass transition temperature of 45 to 100 ° C. or a urethane resin having a glass transition temperature of −10 to 20 ° C. Furthermore, it is particularly preferable to use the acrylic resin from the viewpoint of preventing a blocking phenomenon between films when the film is wound into a roll after providing the blocking portion 7.
The blocking part 7 preferably contains 90% by mass (solid content ratio) or more of the polymer, more preferably 95% by mass or more, and particularly preferably 99% by mass or more. The blocking part 7 is preferably substantially free of a slip component, and specifically, the slip component is 1% by mass or less. Moreover, when the tackifier is contained in the forming material of the blocking part 7, it is a viewpoint which prevents that the polymer which comprises the blocking part 7 will be in the state which adhered to the container 2, when removing the cylindrical label 1 from the container 2. Therefore, the amount of the tackifier is 5% by mass (solid content ratio) or less, and in particular, the tackifier is preferably 1% by mass or less.

  The cylindrical body (heat-shrinkable cylindrical label 1) obtained by forming the label base material 3 into a cylindrical shape has a most part of the innermost surface (container contact surface) constituted by the sliding layer 33, and the innermost surface Among them, the blocking portion 7 is formed in a part of the position corresponding to the lower portion 22 a of the body 2 of the container 2.

The heat-shrinkable cylindrical label 1 of the present invention is attached to a flexible container 2 made of a synthetic resin in which a stored item is enclosed in a state higher than atmospheric pressure, and in particular, a flexible body having a cylindrical body. When mounted on the container 2, the effect of the present invention is remarkably exhibited.
The shape of the container 2 is not particularly limited. For example, as shown in FIG. 4, a barrel 22 having a cylindrical outer surface and a spout (not shown) are formed, and a screw cap for sealing is formed at the spout. 24 is attached. Specifically, the container 2 is formed with a bottom surface portion 21, a hollow body portion 22 having a cylindrical outer surface following the bottom surface portion 21, and a shoulder portion 23 gradually narrowing from the body portion 22. Is formed. The outer surface of the trunk | drum 22 and the shoulder part 23 of the container 2 is formed in the smooth curved surface which does not have an unevenness | corrugation (rib etc.) substantially in the circumferential direction. Further, the spout is composed of a substantially cylindrical peripheral wall portion having a male screw portion formed on the outer surface and an opening portion formed at the upper end of the peripheral wall portion, and the central axis of the opening portion is the central axis of the trunk portion 22. It is formed to coincide with the top. The screw cap 24 is capable of opening and closing the opening, and is formed with a female screw portion that is screwed into the male screw portion of the spout (both not shown). Therefore, the screw cap 24 can be removed from the spout by rotating the screw cap 24 around the central axis.
Further, the container 2 has a plurality of recessed portions 25 formed from the bottom surface portion 21 to the lower body portion 22a. The recesses 25 are formed at predetermined intervals in the circumferential direction of the container 2, and the recesses 25 are formed at, for example, five locations. Generally, such an arcuate convex portion between the concave portion 25 and the concave portion 25 is called a pedaloid type, and is widely used as a pressure vessel shape suitable for storing carbonated beverages and the like. Although the capacity | capacitance of the container 2 is not specifically limited, Usually, the thing of about 0.35 liters-2 liters is illustrated. In particular, the heat-shrinkable cylindrical label 1 of the present invention is attached to a container that opens the screw cap 24 by holding the body part 22 with one hand, for example, a container having a circumferential length of about 15 cm to 30 cm. In this case, the effect of preventing idling is remarkably exhibited.

The container 2 is formed so that the wall thickness at the body center 22b is thinner than the wall thickness at the body lower part 22a. Specific examples of the thickness are generally such that the thickness of the barrel center 22b is about 0.35 to 0.55 mm, and the thickness of the barrel lower portion 22a is about 0.4 to 0.6 mm. . In addition, the trunk | drum center 22b is the intermediate point of the up-down direction length L from the bottom face part 21 of the container 2 to the upper end of the trunk | drum 22 (boundary of the shoulder part 23 and the straight trunk | drum 22 is gradually thinned). To tell. Further, the lower portion 22a of the body portion is 1/4 of the vertical length L from the bottom surface portion 21 of the container 2 to the upper end of the body portion 22 ([L × 1/4] length upward from the bottom surface portion 21). In the case of the above-mentioned Pedaloid type container, the point is 10 mm above the upper end of the recess 25.
In addition, when the screw cap 24 is opened from a state in which a pressurizing container such as a carbonated beverage is enclosed, the container 2 has the circumferential length of the lower portion 22a of the trunk portion after the screw cap 24 is opened. It is reduced to 0.980 to 1.000 times the circumferential length of the barrel lower part 22a before the stopper. In particular, the reduction ratio of the lower body portion 22a is preferably 0.990 to 1.000 times, and more preferably 0.995 to 1.000 times.
Further, with respect to the body center 22 b of the container 2, when the screw cap 24 is opened from the state in which the pressurization container is enclosed, the circumferential length of the body center 22 b after the screw cap 24 is opened is The body portion 22a is reduced at a rate larger than the reduction rate (0.980 to 1.000 times) of the circumferential length of the lower portion 22a. Specifically, in the case of the container 2 in which the lower portion 22a of the barrel portion is reduced by a factor of 0.997 to 0.999, the circumferential length of the barrel portion center 22b after the screw cap 24 is opened is the barrel portion before opening. It is reduced to 0.988 to 0.993 times the circumferential length of the center 22b and 0.992 to 0.993 times depending on the shape of the container 2 and the like.

  The material of the container 2 is not particularly limited as long as it is made of synthetic resin, and examples thereof include polyesters such as polyethylene terephthalate, polyolefins such as polypropylene, and the like, and usually polyester-based blow molded containers such as polyethylene terephthalate (so-called PET bottles). ) Is used.

The heat-shrinkable cylindrical label 1 is formed into a cylindrical shape by superimposing both side ends of a long label base material according to a known production method, and the cylindrical label continuous body is flattened into a roll shape. It is wound up and loaded into a shrink labeler.
Since most of the innermost surface of the heat-shrinkable cylindrical label 1 is composed of the sliding layer 33, the phenomenon that the inner surfaces adhere to each other even when the cylindrical label continuous body is wound in a flat shape (blocking). There is no risk of causing.
In the shrink labeler, the tubular label continuous body is cut into a predetermined length to form one heat-shrinkable tubular label 1, which is externally fitted from the body 22 to the shoulder 23 of the container 2. Since most of the inner surface of the heat-shrinkable cylindrical label 1 is composed of the sliding layer 33, the heat-shrinkable cylindrical label 1 smoothly slides with respect to the container 2 when fitted externally. The cylindrical label 1 can be fitted on a predetermined position of the container 2 without causing wrinkles or the like.

After the external fitting, the heat-shrinkable cylindrical label 1 is heated to a predetermined temperature (for example, 90 ° C. steam is applied for 5 seconds), and the heat-shrinkable cylindrical label 1 is heat-shrinked and attached to the container 2.
The polymer (blocking portion 7) partially provided on the inner surface of the heat-shrinkable cylindrical label 1 is softened by heat for shrinking the heat-shrinkable cylindrical label 1, and the polymer becomes the body of the container 2. Close contact with the outer surface of the lower part 22a. As described above, the label-mounted container 2 with the blocking portion 7 in close contact has a high coefficient of friction between the blocking portion 7 of the heat-shrinkable cylindrical label 1 and the lower portion 22a of the body 2 of the container 2.
When the screw cap 24 of the container 2 with the label attached is opened, the internal pressure is reduced, and the body portion 22 of the container 2, particularly the body portion center 22b, is relatively greatly reduced. In this respect, since the blocking portion 7 is firmly adhered to the outer surface of the lower portion 22a of the trunk portion that is relatively difficult to reduce after opening, the heat-shrinkable cylindrical label 1 is idled when the screw cap 24 is turned. Can be prevented.

  The mounting position of the heat-shrinkable cylindrical label 1 with respect to the container 2 is not particularly limited, but preferably, the blocking section 7 is mounted so as to be positioned between adjacent recesses 25 as shown in FIG. Is good. This is because the entire blocking portion 7 is brought into close contact with the outer surface of the lower portion 22a of the body 2 of the container 2 and more reliably prevents the idling. However, as shown in FIGS. 6A and 6B, even if the heat-shrinkable cylindrical label is attached to the position where the lower part of the blocking part 7 faces the recess 25, the upper part of the blocking part 7 is Since it is in close contact with the outer surface of the container 2, the effect of preventing idling is not impaired.

Next, a modification of this embodiment is shown.
In the above, the design printing layer 32 is not provided in the portion where the polymer constituting the blocking portion 7 is applied, and the configuration in which the polymer is directly applied to the inner surface of the base film 32 is exemplified. The design printing layer 32 may be provided in the part which coats.
Further, in the above, the blocking portion 7 is composed of a coating portion coated with a polymer. For example, as shown in FIG. 7, the inner surface of the base film 31 is exposed in a range where the blocking portion 7 is provided. May be. That is, by exposing the base film 32 to a part of the inner surface of the cylindrical body corresponding to the lower portion 22 a of the body 2 of the container 2, this can be used as the blocking portion 7. Since this film exposed part (blocking part 7) is a base film which comprises the heat-shrinkable cylindrical label 1, it can be softened at the heat shrink temperature of the heat-shrinkable cylindrical label 1. Therefore, when the heat-shrinkable cylindrical label 1 is heat-shrink mounted, the film exposed portion is in close contact with the outer surface of the lower portion 22a of the body 2 of the container 2. Thus, the blocking part 7 which consists of a film exposure part can prevent the idle rotation of the cylindrical label 1 similarly to the blocking part 7 which consists of the said polymer coating part. Further, the film exposed portion may be subjected to a surface treatment such as a corona discharge treatment. By performing such a process, the adhesion of the blocking portion 7 to the outer surface of the container 2 can be enhanced. The corona discharge treatment is carried out so that the treated surface is preferably 45 dynes or more, more preferably 50 dynes or more, particularly preferably 52 dynes or more. The present inventors have proved that when the treated surface after the corona discharge treatment is 40 dynes or less, the idling prevention effect is small, and by setting it to the above numerical value or more, the idling prevention effect can be improved. .

Further, in the present embodiment, the blocking portion 7 is illustrated as being formed at one place, but it may be provided at a position corresponding to the lower portion 22a of the trunk portion, for example, in the circumferential direction of the container 2 A plurality of blocking portions 7 can also be formed at intervals.
Thus, in the case where a plurality of blocking portions 7 are provided, when the heat-shrinkable cylindrical label 1 (cylindrical label continuous body) is flattened, a plurality of blocking portions 7 are arranged at positions where the blocking portions 7 do not overlap each other. Part 7 is arranged. This is to prevent a defective opening of the flat heat-shrinkable cylindrical label 1 (tubular label continuous body).
Moreover, since the blocking part 7 of this embodiment should just be formed in the position corresponding to the trunk | drum lower part 22a at least, for example, the blocking part 7 is the inner surface of the center seal | sticker part 4, and / or the inner surface of the remainder margin 5. However, it may be formed at a position corresponding to the lower portion 22a of the inner surface of the body.
Moreover, you may form the blocking part 7 in strip shape ranging from the upper edge of the cylindrical label 1 to a lower edge.

Second Embodiment
2nd Embodiment concerns on the heat-shrinkable cylindrical label by which the blocking part is provided in the inner surface of the remainder. Hereinafter, the configuration and effects different from those of the first embodiment will be mainly described, and description of the same configuration and the like may be omitted, and terms and figure numbers may be used.

  As shown in FIG. 8, the heat-shrinkable cylindrical label 1 of the present embodiment has a blocking portion 7 formed on the inner surface of at least the margin 5 in the center seal portion 4. As shown in the first embodiment, the surplus margin 5 is such that the other end portion 3b of the label base material 3 located inside the one end portion 3a extends from the center seal portion 4 in the circumferential direction. And is formed in a band shape from the upper end edge to the lower end edge of the cylindrical body. The width of the margin 5 is usually about 3 mm to 7 mm, but is not particularly limited to this length.

The blocking portion 7 may be provided on the entire inner surface of the upper and lower belt-like surplus margin 5 or may be provided in a dotted manner in the vertical direction of the surplus margin 5.
From the viewpoint of manufacturing the heat-shrinkable cylindrical label 1 and preventing idling, it is preferable that the blocking portion 7 is provided in a strip shape on the entire inner surface of the remainder 5.
As shown in the first embodiment, the blocking portion 7 may be formed by applying a polymer that can be softened at a heat shrink temperature, or the inner surface of the base film 31 is exposed. May be formed.
When the blocking part 7 is formed by coating a polymer, it is preferable that the design printing layer 32 is provided in the range where the design printing layer 32 is provided as shown in FIG. . This is because, as described above, the design printing layer 32 is not provided on the inner surface of the one side end 3a of the label base material 3, and therefore, if the design printing layer 32 is not provided in the portion of the margin 5, This is because, on the appearance of the shrinkable cylindrical label, a portion without design printing appears in a streak shape.
However, in the center seal portion 4, the design printing layer applied to the outer side end portion 3 b positioned on the inner side and the outer side end portion 3 b positioned on the inner side in the center seal portion 4. If the layers are configured to overlap, the streak portion does not appear in appearance. Accordingly, in the case of such a configuration, as shown in FIG. 8, it is not necessary to provide the design printing layer 32 on the entire remainder allowance 5, for example, the design printing layer 32 on the edge side of the remainder allowance 5. It is also possible to change to a configuration in which no is provided.

Further, as shown in FIG. 9, the blocking portion 7 may be formed not only on the inner surface of the margin 5 but also on the inner surface of the other end portion 3 b corresponding to the center seal portion 4.
Further, although not particularly illustrated, the blocking portion 7 is not limited to the one provided in the entire margin 5 (from the upper edge to the lower edge of the cylindrical label 1), and a part of the margin 5, for example, the container 2 You may be provided in the position corresponding to the trunk | drum lower part 22a, the upper edge part of the cylindrical label 1, and a lower edge part.
In addition, the sliding layer 32 is provided except the range in which the blocking part 7 was provided among the innermost surfaces of a cylindrical body (heat-shrinkable cylindrical label 1).

As in the first embodiment, the heat-shrinkable cylindrical label 1 according to the present embodiment is attached to at least the trunk portion 22 of the synthetic resin-made flexible container 2 in which the stored items are sealed in a state higher than the atmospheric pressure. Installed.
Since the heat-shrinkable cylindrical label 1 is also provided with the sliding layer 33 on most of the inner surface, it can be smoothly fitted onto the container 2.
And when the heat-shrinkable cylindrical label 1 is heated, the surplus margin 5 is strongly pressed toward the outer surface side of the container 2 by the contraction of itself and the contraction force of the one side end portion 3a that overlaps the outside. The softened blocking portion 7 is in close contact with the outer surface of the body portion 22 of the container 2. Since the contraction force is strong in the vicinity of the center seal portion 4, the blocking portion 7 is strongly pressed against and closely contacts the outer surface of the container body portion 22. Since the blocking portion 7 is formed in the up and down direction of the margin of allowance 5, for example, even if the blocking portion 7 is attached to the container 2 having the trunk center 22b that is relatively greatly reduced when the cap is opened, the blocking portion 7 is not attached to the container. It is possible to maintain a tight contact state at the upper and lower portions of the body portion 22. Therefore, it is possible to prevent the heat-shrinkable cylindrical label 1 from idling when the container with the label attached is opened and closed.

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

Example 1
Using a polystyrene stretched film with a thickness of 50 μm (trade name: GMVS, manufactured by Gunze Packaging System Co., Ltd.) as a heat-shrinkable film, a range in which a center seal portion is formed on one side of the film (a range of 5 mm width from one edge of the film) ) And a range where the blocking part is formed (a range of 40 mm in height and 10 mm in width from the lower edge of the film), and an acrylic medium ink containing a sliding component (trade name: STR heat-resistant CS medium, manufactured by Dainichi Seika Kogyo Co., Ltd.). The glass transition temperature was about 50 ° C.). The coating method was performed by a gravure printing method (70 lines, coating thickness of 2 to 4 μm).
Next, in the range where the blocking part is formed, the viscosity of the acrylic medium ink containing no slipping component (manufactured by Sakata Inx Corporation, trade name: Etna toning medium. Glass transition temperature: about 50 ° C.) is adjusted using a solvent. And then coated. In addition, the coating method was performed by the gravure printing method (70 lines, thickness 2-4 micrometers at the time of coating).
A heat-shrinkable cylindrical label was produced by forming this film into a cylindrical shape with the coating surface on the inside, and bonding the end portions on both sides to form a center seal portion.
The obtained cylindrical label was externally fitted from the shoulder part to the lower end edge of the trunk part of a 500 ml petaloid type PET container (made by Toyo Sei, but filled with carbonated beverage), and a 90 ° C. steam tunnel. For 5 seconds to heat-shrink.

This labeled container was cured at 23 ° C. for 24 hours to remove water remaining between the container and the cylindrical label.
Thereafter, the screw cap of the label-mounted container was once opened to reduce the internal pressure, and the cap was resealed. Immediately after resealing, the following opening torque test was conducted.
In addition, after opening the container, the circumference of the trunk part (middle position of the trunk part) is 0.989 times that before opening, and the container is below the trunk part (position 10 mm above the upper end of the recess). The perimeter was deformed 0.997 times before opening.

The opening torque test was performed by measuring a torque tester (model name: 2TME450CN (measurable up to 4.5 N · m), manufactured by Tohnichi Corporation). The pouring portion of the label-equipped container 10 was fixed to the chuck 100 of this torque tester (see FIG. 10). In addition, fixing of this extraction | pouring part is fixed so that it may not open even if a rotational force is applied.
The body of the container was grasped with one hand from above the cylindrical label and rotated around the rotation center axis of the screw cap, and the maximum torque when the cylindrical label began to idle was measured. Three samples were measured. Each sample had a torque value of 450 cN · m or more (measurement limit of the torque tester).

(Example 2)
A heat-shrinkable cylindrical label was produced in the same manner as in Example 1 except that the range for forming the blocking portion was a band-shaped range that was 10 mm wide from the other edge of the film and spanned the upper and lower edges of the film, Similarly, it was attached to a petaloid type PET container, and an opening torque test was conducted. In addition, this Example 2 respond | corresponds to the heat-shrinkable cylindrical label which concerns on the said 2nd Embodiment.
As a result, each sample had a torque value of 450 cN · m or more (measurement limit of the torque tester).

(Example 3)
A heat-shrinkable cylindrical shape in the same manner as in Example 1 except that the acrylic medium ink containing no sliding component was not applied (that is, the film surface was exposed in the area where the blocking portion was formed). A label was prepared and similarly mounted on a petaloid type PET container, and an opening torque test was performed.
As a result, each sample had a torque value of 450 cN · m or more (measurement limit of the torque tester).

Example 4
As a heat-shrinkable film, a 50 μm thick polyethylene terephthalate-based stretched film (trade name: S7042 manufactured by Toyobo Co., Ltd.) was used, and urethane-based medium ink (Daiichi Seika Kogyo Co., Ltd.) containing no slip component. Manufactured under the trade name: NT Hiramic Toning Medium), a heat-shrinkable cylindrical label was prepared in the same manner as in Example 1, and similarly attached to a petaloid-type PET container and opened. A torque test was performed.
As a result, each sample had a torque value of 450 cN · m or more (measurement limit of the torque tester).

(Comparative Example 1)
As a heat-shrinkable film, a polystyrene biaxially stretched film (Gunze Packaging System Co., Ltd., trade name: GMVS) having a thickness of 50 μm is used, and a range in which a center seal portion is formed on one side of the film (5 mm wide from one edge of the film) Except for the range, an acrylic medium ink containing a slip component (manufactured by Dainichi Seika Kogyo Co., Ltd., trade name: STR heat-resistant CS medium, glass transition temperature about 50 ° C.) was applied. The coating method was performed by a gravure printing method (70 lines, coating thickness of 2 to 4 μm).
A heat-shrinkable cylindrical label was produced by forming this film into a cylindrical shape with the coating surface on the inside, and bonding the end portions on both sides to form a center seal portion.
Thereafter, in the same manner as in Example 1, it was attached to a petaloid type PET container, and an opening torque test was conducted.
As a result, the average value of the three samples was a torque value of 83 cN · m.

  From the above results, it can be seen that the heat-shrinkable cylindrical labels of Examples 1 to 4 are difficult to idle after being attached to the container, while the heat-shrinkable cylindrical labels of Comparative Example 1 are easy to idle. I understand.

The perspective view which shows the heat-shrinkable cylindrical label which concerns on 1st Embodiment. The partially abbreviated end view which cut | disconnected the label in the circumferential direction in the AA line. The perspective view which showed the label base material from the inner surface side. The front view which shows one Embodiment of the container with which the heat-shrinkable cylindrical label of this invention is mounted | worn. The front view which shows the container with label attached. The front view which shows the label mounted container from which the mounting position of the heat-shrinkable cylindrical label differed. (A) is a partially omitted end view of a heat-shrinkable cylindrical label according to a modification of the first embodiment cut in the circumferential direction, and (b) is used for the heat-shrinkable cylindrical label of (a). The perspective view which showed the label base material used from the inner surface side. (A) is a partially omitted end view of the heat-shrinkable cylindrical label according to the second embodiment cut in the circumferential direction, and (b) is a label base used for the heat-shrinkable cylindrical label of (a). The perspective view which showed the material from the inner surface side. The partial omission end view which cut | disconnected the heat-shrinkable cylindrical label which concerns on the modification of 2nd Embodiment in the circumferential direction. The reference front view which shows the implementation status of the opening torque test.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Heat-shrinkable cylindrical label, 2 ... Container, 21 ... Container bottom part, 22 ... Container trunk | drum, 22a ... Container trunk | drum lower part, 22b ... Container trunk | drum center, 25 ... Container dent part, DESCRIPTION OF SYMBOLS 3 ... Label base material, 31 ... Base film, 32 ... Design printing layer, 33 ... Sliding layer, 3a ... One side edge part, 3b ... Other side edge part, 3b '... Side edge of the other side edge part, 4 ... Center Seal part, 5 ... remainder, 7 ... blocking part

Claims (4)

In the heat-shrinkable cylindrical label attached to the body of the container shown below,
It has a cylindrical body made of a heat shrinkable base film with a sliding layer provided on the inner surface, and the heat shrink temperature of the base film on a part of the inner surface of the cylindrical body corresponding to the lower part of the container body A heat-shrinkable cylindrical label, wherein at least one of a blocking part coated with a softening polymer and a blocking part exposing a base film is provided.
However, the container is a flexible container made of a synthetic resin having a trunk portion and a screw cap capable of opening and closing the spout, and in which a stored item is enclosed in a state higher than atmospheric pressure, The wall thickness at the center is formed thinner than the wall thickness below the trunk. In the heat-shrinkable cylindrical label attached to the body of the container shown below,
It has a cylindrical body made of a heat shrinkable base film with a sliding layer provided on the inner surface, and the heat shrink temperature of the base film on a part of the inner surface of the cylindrical body corresponding to the lower part of the container body A heat-shrinkable cylindrical label, wherein at least one of a blocking part coated with a softening polymer and a blocking part exposing a base film is provided.
However, the container is a flexible container made of a synthetic resin having a body portion and a screw cap capable of opening and closing the spout, and in which a stored item is sealed in a state higher than atmospheric pressure, and the screw cap The circumference of the lower part of the trunk after opening the plug is reduced to 0.980 to 1.000 times the circumference before opening, and the circumference of the middle of the trunk after opening the screw cap The length is reduced more than the reduction ratio of the circumferential length below the trunk. In the heat-shrinkable cylindrical label attached to the body of the container shown below,
One side end of heat-shrinkable base film provided with a sliding layer on the inner surface is overlapped with the outer surface of the other end and center-sealed to form a cylindrical shape. Between the edge and the center seal part, a non-adhesive margin is secured at one side end, and a blocking section coated with a polymer that can be softened at the heat shrink temperature of the base film on the inner surface of the margin, Or at least any one of the blocking part which exposed the base film is provided, The heat-shrinkable cylindrical label characterized by the above-mentioned.
However, the container is a flexible container made of a synthetic resin that has a body portion and a screw cap capable of opening and closing the spout and in which the stored item is sealed in a state higher than atmospheric pressure.   The heat-shrinkable cylindrical shape according to any one of claims 1 to 3, wherein the container is formed with a plurality of concave portions recessed inward at a predetermined interval in a circumferential direction of the body portion below the body portion. label.

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