JP5476634B2 - Heat-shrinkable cylindrical label - Google Patents

Description

  The present invention relates to a heat-shrinkable cylindrical label, and more particularly to a heat-shrinkable cylindrical label composed of a heat-shrinkable different laminated film.

  Heat-shrinkable labels are widely used as labels for various beverage products and toiletry products filled in plastic bottles and the like. In the field of heat-shrinkable labels, dissimilar laminated films obtained by laminating dissimilar material films having different resin compositions are used for the purpose of imparting various different characteristics to heat-shrinkable films.

  Heat-shrinkable labels are heat-shrinkable into containers after overlapping the side edges so that one side edge of a heat-shrinkable film such as a different type of laminated film is outside and the other side edge is inside. In many cases, a joint portion (hereinafter referred to as a center seal portion) is formed to join (seal) the side edge portions in order to maintain the cylindrical shape. Generally, the center seal part is formed by a method of applying a solvent to the side edge part of the heat-shrinkable film and welding it.

  The heat-shrinkable label (heat-shrinkable tubular label) formed into a tubular body is heat-shrinked in the circumferential direction of the tubular body by the heat treatment at the time of attachment, and is attached following the shape of the container. In this thermal contraction process, a large contraction stress acts on the center seal portion. And when a dissimilar laminated film is used as the heat-shrinkable film constituting the label, there is a problem that delamination is likely to occur at the center seal portion due to the difference in heat-shrinkage speed of each layer. Therefore, in order to prevent delamination at the center seal portion, a method of improving the adhesive strength of each layer by improving the adhesive provided between the layers has been studied. In addition, as disclosed in Patent Document 1, a method for improving the resin composition of a heterogeneous laminated film has also been studied.

JP 2009-178887 A

  However, with the method of improving the adhesive, it is difficult to sufficiently prevent delamination without affecting other properties. For example, when an adhesive containing a resin having high heat resistance is used, the resin becomes hard, which causes a problem that the fold of the label is whitened. On the other hand, when an adhesive containing a highly flexible resin is used, the adhesive is easily plasticized due to a solvent when forming the center seal portion or a residual solvent when forming the printing layer, and prevents delamination. I can't. Moreover, in the method of improving the resin composition of a different laminated film, there exists a subject that a resin composition is limited significantly.

  An object of the present invention is to provide a heat-shrinkable cylindrical label capable of highly preventing delamination during the heat-shrink process in a heat-shrinkable cylindrical label composed of various different types of laminated films. is there.

The heat-shrinkable cylindrical label according to the present invention has a heat-shrinkable heterogeneous laminated film including a first layer and a second layer made of different material films having different resin compositions, and one side end of the heterogeneous laminated film is In a heat-shrinkable cylindrical label comprising: a tubular body that is overlapped so that the outer side and the other side end are inside; and a joining portion that is formed by joining the overlapped overlapping portions. Through holes or recesses formed by irradiating one overlapping portion of the different types of laminated films located on the outside with laser light and the first layer around the periphery of the through holes or recesses melted and flowed by the laser light irradiation The first layer of the one overlapping portion protrudes from the one side end in the circumferential direction of the cylindrical body, and is welded to the first layer in the region adjacent to the other overlapping portion; It is characterized by providing.
In addition, it is preferable that a through-hole or a recessed part is formed by irradiating a laser beam to the edge of an overlapping part, ie, one side edge.
According to this configuration, the first layer on the periphery (periphery) of the through-hole or the recess, that is, the first layer of one overlapping portion located outside the cylindrical body at the joint portion, and the inner side of the cylindrical body. Since the first layer in the region adjacent to the other overlapping portion is welded to form a welded portion, even if a large shrinkage stress acts on the joint during the heat shrinkage process, the first layer and the second layer Delamination can be prevented.

Further, in the heat-shrinkable cylindrical label according to the present invention, it is preferable that a plurality of through holes or recesses are formed in a line at a predetermined interval to constitute a cutting auxiliary line.
According to the said structure, a welding part can be formed simultaneously with formation of an auxiliary cutting line, and favorable productivity can be implement | achieved. Furthermore, the display area of a character and a design can be expanded by forming a cutting auxiliary line in a junction part.

  According to the heat-shrinkable cylindrical label according to the present invention, delamination during the heat shrinkage process can be highly prevented by the welded portion. Further, if the welding part is formed at the same time as forming the auxiliary cutting line, the production efficiency is improved and the auxiliary cutting line is formed at the joint part, so that the area where characters and designs can be displayed can be expanded.

It is a perspective view of the heat-shrinkable cylindrical label which is embodiment of this invention. In FIG. 1, it is an enlarged view of a center seal | sticker part and its vicinity. It is the sectional view on the AA line of FIG. It is a figure which shows the modification of the heat-shrinkable cylindrical label which is embodiment of this invention.

  Embodiments of a heat-shrinkable cylindrical label according to the present invention will be described below with reference to the drawings.

  In the following embodiments, the first through hole 15 and the plurality of second lines are constituted by a plurality of first through holes 15 with the through hole in which the weld portion 17 is formed at the hole edge as the first through hole 15. Although it demonstrates as what is provided with the 2 cutting | disconnection auxiliary line of the 2nd cutting auxiliary line 20 comprised from the through-hole 19, only the 1st cutting auxiliary line 16 may be sufficient as a cutting auxiliary line, and it welds to a hole edge. The structure which does not utilize the through-hole in which 17 is formed as a cutting auxiliary line may be sufficient.

  Moreover, in this specification, let the direction orthogonal to the radial direction of the heat-shrinkable cylindrical label 10 be an up-down direction or a vertical direction, and let the edge of an up-down direction be an upper end and a lower end. Regarding the heterogeneous laminated film 11, the portions corresponding to the vertical ends of the heat-shrinkable cylindrical label 10 will be described as the upper and lower ends of the heterogeneous laminated film 11, and the ends in the direction perpendicular to the vertical direction will be described as side edges. The terms indicating these directions are used to describe the configuration of the heat-shrinkable cylindrical label 10 and limit the relationship between the components of the heat-shrinkable cylindrical label 10 and the direction. is not.

  Moreover, in this specification, what is the different-type laminated | multilayer film 11 made into the cylindrical shape, Comprising: The center seal | sticker part 12 and the 1st cutting auxiliary | assistant line 16 are not formed, but can be described as a cylindrical body. is there. Further, when the description is made by using the direction and position relating to the cylindrical shape such as the circumferential direction and the inside and outside, the heat-shrinkable cylindrical label 10 may also be described as a cylindrical body.

As shown in FIG. 1, the heat-shrinkable cylindrical label 10 is a tubular body that includes a heat-shrinkable heterogeneous laminated film 11 and a center seal portion 12. The heterogeneous laminated film 11 has a cylindrical body by overlapping the side edges so that one side end is the outside and the other side end is the inside, and the overlapped portion is joined to the center seal portion 12. The cylindrical shape is maintained by forming. In the present specification, the term “side edge” is used simply to mean a portion (region) near the side end of the different type laminated film 11. The “overlapping portion” is a portion included in each side edge portion of the different type laminated film 11 and is a portion overlapping each other when the center seal portion 12 is formed in each side edge portion.
In addition, in FIG. 1, it is the heat-shrinkable cylindrical label 10 before heat-shrink processing, and has illustrated the form that the whole overlap area | region is the center seal | sticker part 12. FIG. The heat-shrinkable cylindrical label 10 is mounted so as to follow the shape of the container by being heat-shrink processed after being fitted into a container (not shown) having a diameter smaller than the inner diameter.

The heat-shrinkable cylindrical label 10 includes a first through hole 15 formed by irradiating one overlapping portion of the different laminated film 11 with laser light and a plurality of first through holes 15 arranged in a line. A first cutting auxiliary line 16 constituted by: a welded portion 17 formed at the edge of the first through hole 15 by irradiation of the laser beam; A first bank-like thick portion 18 (see FIG. 3) extending intermittently.
The heat-shrinkable cylindrical label 10 includes a plurality of second through holes 19 formed in the vicinity of the overlapping portion, and a second cutting auxiliary line 20 configured by arranging the second through holes 19 in a row. . And when the 2nd through-hole 19 is formed by irradiation of a laser beam similarly to the 1st through-hole 15, it is along the row | line | column of the 2nd cutting auxiliary line 20 similarly to the 1st bank-like thick part 18. Thus, the second bank-shaped thick portion 21 (see FIG. 3) is formed.

  The dissimilar laminated film 11 is a heat-shrinkable film including a surface layer 13 as a first layer and a central layer 14 as a second layer made of dissimilar material films having different resin compositions. The first layer is a film layer located on the outer side (hereinafter also referred to as the front side) in the cylindrical body of the heterogeneous laminated film 11, and the second layer is a film located on the inner side (hereinafter also referred to as the back side). Means layer. Further, in the different laminated film 11, the same surface layer 13 as the first layer is laminated on the back side of the center layer 14 as the third layer. Note that the surface layer 13 on the front side of the center layer 14 is described as the surface layer 13a, and the surface layer 13 on the back side of the center layer 14 is described as the surface layer 13b (the same applies to the adhesive layer 22 described later).

  Further, the heterogeneous laminated film 11 includes an adhesive layer 22 (adhesive layers 22a and 22b) between the surface layer 13a and the center layer 14 and between the center layer 14 and the surface layer 13b (see FIG. 3). ). That is, the heterogeneous laminated film 11 is composed of three types and five layers, which are composed of the surface layer 13 (13a) / adhesive layer 22 (22a) / center layer 14 / adhesive layer 22 (22b) / surface layer 13 (13b). It has a structure.

  Moreover, the different laminated film 11 is usually provided with a printing layer on at least the front side of the surface layer 13a or the back side of the surface layer 13b. The printing layer is, for example, a layer for displaying a product name, an illustration, a usage precaution, and the like, and is preferably formed by applying printing ink to the back side of the surface layer 13b. For the formation of the printing layer, solvent-based inks containing desired pigments and dyes, binder resins such as acrylic resins and urethane resins, organic solvents, and various additives (for example, plasticizers, lubricants, waxes, antistatic agents) Alternatively, a UV-curable ink containing a desired pigment or dye, a photopolymerizable resin such as an acrylic resin, a photopolymerization initiator, and the above-described various additives is used as a printing ink. And a printing layer can be formed by performing gravure printing, flexographic printing, letterpress printing, etc. on the back side of surface layer 13b, etc. using this printing ink. In addition, the thickness of a printing layer is 0.1-10 micrometers.

  The heterogeneous laminated film 11 may be provided with a protective layer, an antistatic layer or the like in addition to the printed layer, and may further be provided with a layer such as a nonwoven fabric or paper. In particular, when the printing layer is formed on the front side of the surface layer 13a, it is preferable to provide a protective layer for protecting the printing layer.

  For the surface layer 13 and the center layer 14, films having various resin compositions can be used. For example, polyolefins such as polyethylene (PE) and polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and the like. A film selected from polyester-based, polystyrene-based (PS), polylactic acid (PLA), polyamide, and polyvinyl chloride, or a film containing a mixture of two or more of these resins is applied. be able to. In addition, the resin composition of the surface layer 13 and the center layer 14 is not specifically limited.

  For the surface layer 13, for example, a film made of a polyester resin containing a dicarboxylic acid component and a diol component can be used. The polyester resin preferably includes a polyethylene terephthalate (PET) resin containing terephthalic acid as the dicarboxylic acid component and ethylene glycol as the diol component.

For the center layer 14, for example, a film made of polystyrene resin can be used. Polystyrene resins include styrene homopolymers and styrene-conjugated diene copolymers (eg, styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene). -Butadiene-isoprene-styrene block copolymer (SBIS), styrene-ethylene-butylene-styrene block copolymer (SEBS), which is a hydrogenated product of SBS, and the like.
The center layer 14 may be a film composed mainly of an olefin resin such as a polyethylene resin or a polypropylene resin. The polypropylene resin may be a polymer containing propylene as a constituent monomer, and may be a propylene homopolymer or a copolymer containing a copolymer component such as α-olefin (propylene-α-olefin). Copolymer). Preferred are polypropylene (metallocene catalyst-based polypropylene) obtained by polymerization with a metallocene catalyst and a propylene-α-olefin random copolymer. These polypropylene resins can be used alone or in combination of two or more.

  For the adhesive layer 22, for example, a so-called hot melt type adhesive that can be extruded by heating and melting is preferably used. The hot melt adhesive is not particularly limited as long as it improves the adhesive strength between the surface layer 13 and the center layer 14, and an ethylene-vinyl acetate copolymer or an ethylene- (meth) acrylate copolymer. Base resins such as elastomers (synthetic rubbers, olefins, urethanes, etc.), tackifiers (petroleum, terpene, rosin, etc.), and various additives (eg, polyethylene waxes, amide lubricants) And the like.

  The heterogeneous laminated film 11 is preferably a uniaxially stretched film stretched in at least one direction in order to exhibit excellent heat shrinkage characteristics. The heterogeneous laminated film 11 is preferably thermally contracted in the width direction, that is, the direction corresponding to the circumferential direction of the cylindrical body, but may be a biaxially stretched film that thermally contracts in the vertical direction of the cylindrical body. . The heat shrinkage rate of the heterogeneous laminated film 11 is preferably 20 to 80% (immersed in warm water at 90 ° C. for 10 seconds), particularly 30 to 80%, with respect to the circumferential direction of the cylindrical body. preferable.

  Although it does not specifically limit as thickness of the different laminated film 11, It is preferable that it is 10-100 micrometers, More preferably, it is 15-80 micrometers, Especially preferably, it is 20-50 micrometers. The ratio of the thickness of each layer is, for example, surface layer 13a: center layer 14: surface layer 13b = 1: 3: 1 to 1: 8: 1. The adhesive layer 22 is usually set to a thickness thinner than the surface layer 13.

  The center seal portion 12 is a joint portion for maintaining the tubular shape of the heat-shrinkable tubular label 10 and is formed by joining (sealing) the overlapping portions of the different types of laminated films 11 with a solvent or an adhesive. Generally, the center seal portion 12 is formed using an organic solvent that can dissolve the dissimilar laminated film 11 such as tetrahydrofuran (THF). Specifically, it is formed by applying a solvent along the vertical direction on the back side of one overlapping portion of the different laminated film 11 and then welding the solvent applying portion on the front side of the other overlapping portion. The

The first through hole 15 is a through hole formed by irradiating one overlapping portion of the different type laminated film 11 positioned outside the cylindrical body at the center seal portion 12 with laser light. Specifically, when the surface layer 13a at the peripheral edge of the first through hole 15 located outside the cylindrical body is melted by laser light irradiation, the melted surface layer 13a protrudes from the one end 23 and is welded. The first through hole 15 is formed at a position where can be formed. Here, the one end 23 means a side end of the dissimilar laminated film 11 located outside the cylindrical body at the center seal portion 12 (of the dissimilar laminated film 11 located inside the tubular body at the center seal portion 12). The side end is shown as the other end 24).
For example, the first through hole 15 is formed within a range of about 2 mm from the one end 23, preferably within a range of about 1 mm, although it varies depending on the size of the first through hole 15 and the like. In the form illustrated in FIG. 1, as will be described in detail later, the center of the first through hole 15 is located on the one end 23, and penetrates one overlapping portion and the other overlapping portion of the different laminated film 11. A first through hole 15 is formed.

  Moreover, the 1st through-hole 15 is formed in multiple numbers by the predetermined interval along the up-down direction from the upper end to the lower end of the cylindrical body. The shape, size, formation interval, and the like of each first through-hole 15 can be arbitrarily set by adjusting the irradiation condition of the laser beam, the transfer speed of the long heterogeneous laminated film 11 described later, and the like. As the laser device to be used, a pulse laser device such as a carbon dioxide gas laser, an argon laser, a YAG laser is suitable.

  The first cutting auxiliary line 16 includes a plurality of first through holes 15 formed in a row at predetermined intervals, and is a so-called sewing machine used when the heat-shrinkable cylindrical label 10 is cut and removed from the container. It is a line of sight. The first cutting auxiliary line 16 is required to have a function of being easily cut when the heat-shrinkable cylindrical label 10 is peeled and removed without being cut in the process of manufacturing and distributing the heat-shrinkable cylindrical label 10. For example, the function is expressed by adjusting the shape, size, number, and formation interval of the first through holes 15.

  In the center seal portion 12, the welded portion 17 is a region adjacent to the surface layer 13a of one overlapping portion of the dissimilar laminated film 11 positioned outside the cylindrical body and the other overlapping portion positioned inside the cylindrical body. The surface layer 13a is a welded portion formed by welding. Specifically, the surface layer 13a of one of the overlapping portions melts and flows due to the laser light irradiation when forming the first through hole 15, and the circumferential direction of the cylindrical body from one end 23 of the different laminated film 11 The welded portion 17 is formed by welding to the surface layer 13a in the region adjacent to the other overlapping portion. In addition, since the first cutting auxiliary line 16, that is, the first through hole 15 is formed at a predetermined interval from the upper end to the lower end of the cylindrical body, the welded portion 17 is also formed at a predetermined interval from the upper end to the lower end of the cylindrical body. The

  The first bank-like thick portion 18 (see FIG. 3) is considered to be generated by the action of local heat shrinkage stress and surface tension in the vicinity of the first cutting auxiliary line 16 formed by the thermal effect of laser light irradiation. In addition, the film is prevented from transverse tearing when the heat-shrinkable cylindrical label 10 is cut off, thereby resulting in better cutability of the film.

  Here, the configuration of the center seal portion 12 and the vicinity thereof, in particular, the configuration of the first through hole 15 and the welded portion 17 will be further described with reference to FIGS. 2 and 3.

  2 is an enlarged view of the center seal portion 12 in FIG. 1 and the vicinity thereof, and FIG. 3 is a sectional view taken along line AA in FIG. As shown in FIG. 3, the dissimilar laminated film 11 exemplified here has an adhesive layer 22 (adhesive layer 22a) between the surface layer 13a and the center layer 14 and between the center layer 14 and the surface layer 13b. , B), but it is also possible to use a heterogeneous laminated film that does not include the adhesive layers 22a, b.

  As shown in FIGS. 2 and 3, the first through hole 15 is formed around the one end 23 of the dissimilar laminated film 11 located outside the cylindrical body at the center seal portion 12. That is, the first through hole 15 is formed on the one end 23 of the different type laminated film 11 so as to position the center of the laser beam spot. The first through hole 15 has an elliptical shape having a long diameter in the circumferential direction of the cylindrical body, and the midpoint of the long diameter L is located on the one end 23, and is positioned outside the tubular body by the center seal portion 12. The different laminated film 11 is formed so as to pass through one overlapping portion of the different laminated film 11 and the other overlapping portion of the different laminated film 11 positioned inside the cylindrical body by the center seal portion 12. A weld 17 that protrudes from the one end 23 in the circumferential direction of the cylindrical body is formed at the hole edge of the first through hole 15.

The welded portion 17 is formed at the hole edge of the first through hole 15 by irradiation with laser light when forming the first through hole 15, and protrudes from the one end 23 of the dissimilar laminated film 11 in the circumferential direction of the cylindrical body. It has a shape. This protruding shape is obtained by melting one surface of the superposed portion of the dissimilar laminated film 11 located outside the cylindrical body at the center seal portion 12, that is, the surface layer 13 a of the superposed portion on the one end 23 side by the laser beam irradiation. It is formed by flowing from 23 in the circumferential direction of the cylindrical body. That is, the laser beam irradiation also melts the other overlapping portion located inside the cylindrical body at the center seal portion 12, that is, the overlapping portion on the other end 24 side and the surface layer 13a in the region adjacent to the overlapping portion. By welding with the surface layer 13a of the overlapping portion on the one end 23 side that has flowed from the one end 23, the weld portion 17 protruding from the one end 23 in the circumferential direction of the cylindrical body is formed.
The region adjacent to the overlapping portion on the other end 24 side means a region (part) adjacent to the overlapping portion in the heterogeneous laminated film 11 on the other end 24 side. This is a region where the surface layer 13a of the overlapping portion melts and flows from one end 23, and is a region where the right half of the first through hole 15 is formed.

  A plurality of welds 17 are formed at predetermined intervals along the vertical direction of the cylindrical body. The interval at which the welded portion 17 is formed corresponds to the position where the first through hole 15 is formed. Since the first through hole 15 is formed so as to satisfy the function as the first auxiliary cutting line 16, a plurality of welded portions 17 are usually formed at a predetermined interval, but may be formed continuously. . For example, when the interval between the first through holes 15 is reduced, the interval between the welded portions 17 is also reduced, and the adjacent welded portions 17 are connected to form the welded portion 17 that is continuous in the vertical direction of the cylindrical body. You can also.

Moreover, the 1st bank-like thick part 18 is formed in the periphery of the 1st through-hole 15, and has the shape which rose in the bank shape. In FIG. 3, only the surface layer 13a is shown raised, but in actuality, both the surface layer 13a and the center layer 14 are melted and mixed to form the first bank-shaped thick portion 18. ing. For example, the first bank-like thick portion 18 is formed in a continuous form in the vertical direction of the tubular body, like the welded portion 17, by reducing the formation interval of the first through holes 15.
A second bank-like thick part 21 similar to the first bank-like thick part 18 is formed at the periphery of the second through hole 19.

  Here, the manufacturing method of the heat-shrinkable cylindrical label 10 provided with the said structure is illustrated.

First, the manufacturing method of the different laminated film 11 is demonstrated.
The heterogeneous laminated film 11 is produced, for example, by coextrusion. In the method for producing the three-kind five-layer heterogeneous laminated film 11 by co-extrusion, the resins constituting the surface layer 13, the center layer 14, and the adhesive layer 22 were charged into separate extruders and melted from the respective extruders. In this method, the resin is supplied to a T-die and spread into a smooth thin film, and the thin film-shaped molten resin is extruded from a die slit onto a cooled casting drum to be cooled and solidified to form a laminated film. As a lamination method, for example, either a feed block method in which a feed block is installed immediately before a T die and each molten resin is supplied to the T die in a laminar flow state, or a multi manifold method using a multi-layer manifold is applied. Good.

  A long unstretched heterogeneous laminated film produced by coextrusion is heat stretched in at least one direction. Stretching may be biaxial stretching in the width direction and longitudinal direction (vertical direction) of the long film, or may be uniaxial stretching in the width direction or longitudinal direction, but preferably in the width direction. Uniaxial stretching. In addition, as a drawing method, a roll method, a tenter method, or the like can be used. In general, the elongated heterogeneous laminated film 11 is produced by being heated and stretched in the width direction with a roll or the like while continuously conveying the elongated unstretched laminated film in the longitudinal direction.

  The stretching temperature varies depending on the type of resin constituting the heterogeneous laminated film 11, but is generally in the temperature range of 70 to 100 ° C., preferably 90 to 100 ° C. Moreover, it is preferable that a draw ratio is about 2-6 times with respect to the main extending direction (preferably the width direction of a long film), in order to suppress the shrinkage | contraction and expansion of the direction orthogonal to the main extending direction. In this direction, the film can be stretched at a magnification of about 1.01 to 2 times.

  The obtained elongate heterogeneous laminated film 11 is supplied to a printing machine, and a printing layer is formed on the back side of the surface layer 13b, for example. Then, the side edges are overlapped to form a cylindrical body so that one side end of the long dissimilar laminated film 11 is the outside and the other side end is the inside, and the side edges that are overlapped (that is, The center seal portion 12 is formed by sealing the overlapping portions). Specifically, after forming a printing layer on the long heterogeneous laminated film 11 stretched in the width direction, the printed layer is slit to a predetermined width (the width of one label), and the long heterogeneous laminated film 11 An organic solvent such as THF is applied along the vertical direction on the back side of one overlapping portion so that the width direction is the circumferential direction, and then the solvent applying portion is overlapped and welded on the front side of the other overlapping portion. Thereby, the cylindrical body of the center seal | sticker part 12 and the elongate heterogeneous laminated film 11 is formed.

  The cylindrical body of the obtained long different laminated film 11 is continuously transferred in the longitudinal direction, and laser light is irradiated so that the center of the laser light spot is positioned on one end 23 of the different laminated film 11. A first through hole 15 is formed. As described above, the shape and the like of the first through hole 15 can be changed by adjusting the irradiation condition of the laser beam and the transfer speed of the heterogeneous laminated film 11. The surface layer 13 a around the periphery of the first through-hole 15 is melted and flowed by irradiation with laser light when forming the first through-hole 15, and the welded portion 17 is formed. That is, the weld portion 17 is formed at the same time as the first through hole 15 is formed. Moreover, the 2nd through-hole 19 and the 2nd cutting auxiliary line 20 are formed in the vicinity of the center seal | sticker part 12 with another laser apparatus.

  Finally, the tubular body of the long dissimilar laminated film 11 in which the first through hole 15 and the welded portion 17 are formed, that is, the long heat-shrinkable tubular label 10 is set to the length of each label. By cutting, the heat-shrinkable cylindrical label 10 that can be attached to each container can be obtained.

  As described above, the heat-shrinkable cylindrical label 10 having the above-described configuration includes the surface layer 13a located outside the cylindrical body and the surface layer in the region adjacent to the other overlapping portion located inside the cylindrical body. Since the welded portion 17 formed by melting each other with 13a is provided, delamination between the surface layer 13a and the center layer 14 during the heat shrinkage process can be highly prevented. Since the welded portion 17 is a joint portion formed of the same kind of resin, the surface layer 13a positioned outside the cylindrical body is not broken even if contraction stress is applied during the thermal contraction process. It can be strongly fixed to the surface layer 13a in the region adjacent to the other overlapping portion located inside the shaped body.

  A plurality of first through holes 15 in which the welded portions 17 are formed at the hole edges are formed at predetermined intervals along the vertical direction of the cylindrical body, and can be used as the first auxiliary cutting lines 16. Therefore, since the 1st auxiliary cutting line 16 is formed in the center seal | sticker part 12, the area which can display a character and a design can be expanded.

  In addition, since a plurality of welded portions 17 are formed at predetermined intervals along the vertical direction of the cylindrical body corresponding to the first through-holes 15, the surface layer in the thermal contraction process from the upper end to the lower end of the cylindrical body. Delamination between 13a and the center layer 14 can be prevented to a high degree. When the welded portions 17 are formed at predetermined intervals, there are portions where the welded portions 17 are not formed in the gaps between the welded portions 17 and portions where the delamination is likely to occur remain, but delamination occurred at those portions. However, it is possible to prevent the delamination from being enlarged by the welded portions 17 on both sides.

Here, the modification of the said embodiment is illustrated.
Hereinafter, differences from the above-described embodiment will be described, and the same components or reference numerals will be used for the same constituent elements, and redundant description will be omitted.

In the above description, the first through hole 15 constituting the first auxiliary cutting line 16 is formed by the laser light irradiation and the welded portion 17 is formed at the same time. However, as shown in FIG. The structure which the recessed part 31 (part displayed by a mesh) which is not utilized as a cutting auxiliary line by irradiation of this may be formed.
In the form illustrated in FIG. 4, an elongated elliptical recess 31 is formed along the vertical direction in a portion slightly distant from the one end 23 of the different type laminated film 11. Then, similarly to the case of the first through hole 15, a welded portion 32 that protrudes from the one end 23 in the circumferential direction of the cylindrical body is formed at the edge of the recess 31. The shape of the concave portion 31 is not particularly limited, and may be a substantially circular shape or a substantially quadrangular shape. Even if the welding portion 32 continuous in the vertical direction is formed as the concave portion 31 along the vertical direction of the cylindrical body. Good.

  In the above description, the second through hole 19 and the second cutting auxiliary line 20 are formed in the vicinity of the center seal portion 12 by the laser device, but the second through hole has a perforated cutting blade. May be formed by a Thomson blade, a needle, or the like.

  DESCRIPTION OF SYMBOLS 10 Heat-shrinkable cylindrical label, 11 Different laminated | multilayer film, 12 Center seal part, 13 Surface layer, 14 Center layer, 15 1st through-hole, 16 1st cutting auxiliary line, 17 welding part, 18 1st bank-like thick wall Part, 19 2nd through-hole, 20 2nd cutting auxiliary line, 21 2nd bank-like thick part, 22 Adhesive layer, 23 One end, 24 The other end.

Claims (2)

A heat-shrinkable heterogeneous laminated film including a first layer and a second layer made of different material films having different resin compositions;
One side end of the heterogeneous laminated film is outside and the other side end is overlapped to form a cylindrical body, and a joined portion formed by joining the overlapped portions,
In a heat-shrinkable cylindrical label comprising:
A through-hole or a recess formed by irradiating a laser beam to one overlapping portion of the dissimilar laminated film located outside the cylindrical body;
The first layer at the periphery of the through-hole or the recess melts and flows by the irradiation of the laser light, and the first layer of one overlapping portion protrudes from the one side end in the circumferential direction of the cylindrical body, and the other A welded portion formed by welding with a first layer in a region adjacent to the overlapping portion;
A heat-shrinkable cylindrical label comprising: In the heat-shrinkable cylindrical label according to claim 1,
A heat-shrinkable cylindrical label, wherein a plurality of through-holes or recesses are formed in a row at predetermined intervals to form a cutting auxiliary line.

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