JP2009012781A - Cylindrical shrink label, container having cylindrical shrink label, and method for manufacturing them - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical shrink label having superior productivity which is formed by the welding with semi-conductor laser beams. <P>SOLUTION: A longitudinally and uniaxially oriented heat-shrinkable base material film is cut to a predetermined size in an orienting direction to cut out a label. The label is formed in a cylindrical shape with both cut ends thereof vertically overlapped each other, and the overlapped portion and the lower label in a vicinity of the overlapped portion are irradiated with semi-conductor laser beams to perform the welding of the overlapped portion with semi-conductor laser beams. The cylindrical shrink label has superior heat shrinkage and superior adhesive strength. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cylindrical shrink label formed by laminating both ends of a label cut in the stretching direction in a cylindrical shape and then welding with a semiconductor laser beam, a fiber laser beam or a disk laser beam, a container equipped with the cylindrical shrink label, and The present invention relates to these manufacturing methods.

  Conventionally, a cylindrical shrink label is used for a container such as a beverage, and a cylindrical shrink label is prepared in advance as a container equipped with such a shrink label. There exists what heat-processes and shrink-forms (patent document 1). In this patent document 1, when manufacturing a cylindrical shrink label, a hot-melt-type adhesive is affixed to the both ends of a shrink label, and both ends of a label are stuck together cylindrically via this hot-melt-type adhesive.

  In addition, there is a method in which when a shrink label is bonded in a cylindrical shape, it is welded by laser light, and the obtained cylindrical shrink label is externally attached to a container (Patent Document 2). The label used in Patent Document 2 is a label formed in a cylindrical shape by superimposing both ends of a printed synthetic resin film and welding them by laser light irradiation. A surface layer laminated on both sides of the material, and the surface layer is made of a material having a melting point lower than that of the base material, and the welded surfaces of the both end portions are in a non-printed portion where no printing layer is applied. It is formed.

Moreover, as a manufacturing method of a cylindrical shrink label, there is also a cylindrical shrink label formed by cutting a shrink label roll on which a detection mark is printed into a label length and then forming it into a cylindrical shape (Patent Document 3). Detection marks are printed on a long heat-shrinkable film substrate at predetermined intervals, and label detection is performed by detecting the detection marks with a sensor. By printing with heat erasable ink, the detection mark can be made inconspicuous without going through a special heating process, and it can interfere with the predetermined display such as the design on each label and film. It can be prevented. In patent document 3, in order to adhere | attach the both ends of the heat shrink direction of a heat-shrink film, and shape | mold into a cylinder shape, after cut | disconnecting a heat-shrink film, a cutting label is rotated 90 degree | times and the both ends of a label are adhere | attached on a cylinder shape. Yes.
JP 2006-117269 A JP 2000-141469 A JP 2003-43922 A

  However, since the cylindrical shrink label described in Patent Document 1 is a method of bonding a container and the cylindrical shrink label with a hot melt adhesive, if the container is in a high temperature condition after bonding, The mold adhesive may melt and impair the appearance. In particular, when the contents of the container are heated products, the hot melt adhesive may melt during transfer or within the sales period depending on the storage temperature of the contents. In some cases, the hot-melt adhesive may melt out. In addition, when a reactive hot melt adhesive is used, it has heat resistance after curing, but the productivity is lowered due to the long reaction time.

  Moreover, although the label of patent document 2 is used as the cylindrical label with the laser beam, in order to ensure the adhesiveness with a laser, the layer structure of the label to be used may become complicated. In particular, the action of laser light differs depending on the wavelength of the laser, the carbon dioxide laser is absorbed by water, the semiconductor laser is absorbed by the dye, and the influence on the substance is different. For this reason, when a PET film is irradiated with a carbon dioxide laser beam, it is absorbed by the film and the film surface melts, which may impair the appearance of the product.

  On the other hand, since the shrink label is thermally contracted in the stretching direction, it is attached to the container with the stretching direction and the body winding direction aligned. Conventionally, a laterally uniaxially stretched film is used. For example, as shown in FIG. 3 of Patent Document 3, a cut label is rotated 90 degrees after being cut into a predetermined label length, then formed into a cylindrical shape, and an upright container A cylindrical label was mounted vertically from the top. That is, since the cut surface of the shrink label roll cannot be used as an adhesive portion, a step of rotating the label by 90 degrees is required when adhering in a cylindrical shape. However, if such a process can be eliminated, the cylindrical shrink label can be manufactured in a simpler process.

  Further, when welding the overlapped portion, if the welding width is narrower than that of the overlapped portion, an unwelded white remains, which may become hard after the heat shrinkage treatment of the label and impair the appearance.

  In view of the above-mentioned present situation, the present invention provides a cylindrical shrink label that is manufactured without using an adhesive and is excellent in adhesive strength and appearance.

  In addition, the present invention provides a cylindrical shrink label that can be attached to a container with concavities and convexities, can satisfy the diversification of the container shape, and satisfy the consumer's desire to purchase, and has an excellent heat shrinkage rate.

  The present invention also provides a container equipped with such a cylindrical shrink label.

  Furthermore, this invention provides the manufacturing method of the cylindrical shrink label which is excellent in production efficiency rapidly by a simple process.

  As a result of examining the cylindrical shrink label in detail, the inventor can produce a cylindrical shrink label using a longitudinally uniaxially stretched film having an excellent heat shrinkage rate, so that the stretching direction and the transport direction can be made the same direction. After cutting the film into a predetermined label length, the cut surface can be formed into a cylindrical shape as a welded portion, the step of rotating the label 90 degrees can be omitted, and if the label overlap portion is welded with semiconductor laser light, the use of an adhesive It can be welded efficiently and in a short time, especially if it is a semiconductor laser with a wavelength of 750 to 1200 nm, a fiber laser or a disk laser, in addition to the overlapping part where two labels overlap. It is possible to produce a product with excellent appearance without cutting the film or melting the film surface even if the label part is irradiated. Even when the laser beam absorber is not included in the overlapped portion, it has been found that the label can be stably welded by irradiating the semiconductor laser light after the overlapped portion is sandwiched between metal pressing tools. Completed.

  That is, the present invention is a cylindrical shrink label formed by welding both ends of the label in the stretching direction of the heat-shrinkable base film, and the heat-shrinkable base film stretched in the longitudinal direction is cut into a predetermined size in the stretching direction. The label is cut out, the cut ends of the label are stacked vertically to form a label, and the overlapped portion and the lower label in the vicinity of the overlapped portion are irradiated with semiconductor laser light, fiber laser light, or disk laser light. And the cylindrical shrink label characterized by welding the said overlap part with the said laser beam is provided.

  The present invention also provides a container with a cylindrical shrink label, which is provided with the cylindrical shrink label and subjected to a heat shrink process.

  Further, the heat-shrinkable base film formed by uniaxial stretching in the longitudinal direction is conveyed in the stretching direction, the film is cut into a predetermined label length in the stretching direction, and the label is attached to a cylinder arranged vertically, The cut end of is overlapped up and down to form an overlapped portion, the overlapped portion is sandwiched between the cylinder and the pressing tool, and the semiconductor laser beam is applied to the overlapping portion and the lower label near the overlapping portion from the pressing tool side, The present invention provides a method for manufacturing a cylindrical shrink label, which comprises irradiating a fiber laser beam or a disk laser beam to weld the overlapped portion to form a cylindrical shrink label.

  Furthermore, the heat-shrinkable base film formed by uniaxial stretching in the longitudinal direction is conveyed in the stretching direction, the film is cut into a predetermined label length in the stretching direction, and the label is attached to a vertically arranged cylinder, and the label The cut end of is overlapped up and down to form an overlapped portion, the overlapped portion is sandwiched between the cylinder and the pressing tool, and the semiconductor laser beam is applied to the overlapping portion and the lower label near the overlapping portion from the pressing tool side, Irradiating a fiber laser beam or a disk laser beam to weld the overlapped portion to form a cylindrical shrink label, pulling out the cylinder from the lower side or upper side of the cylindrical shrink label, and the upper side or lower side of the label A container having a cylindrical shrink label, wherein a container is inserted from the side, a cylindrical shrink label is attached to the container, and then heat shrinkage is performed. There is provided a production method.

  The cylindrical shrink level of the present invention is prepared by irradiating a semiconductor laser beam, a fiber laser beam or a disk laser beam, and the laser beam is transparent to the transparent resin and thus has an excellent appearance without melting the label resin surface. Moreover, since the said laser beam is irradiated not only to an overlap part but the said lower label of the overlap part, a label edge part becomes hard and does not stand up, and it is excellent in an external appearance.

  Since the cylindrical shrink label of the present invention does not use an adhesive, the production process can be simplified and the cost can be reduced. In addition, it can be stored and distributed in an environment with a wide temperature range as compared with the case of using a hot melt adhesive.

  The cylindrical shrink level manufacturing method of the present invention can be manufactured by sandwiching the overlapped portion with a metal pressing tool and irradiating the metal pressing tool with a semiconductor laser beam, a fiber laser beam or a disk laser beam. Thus, it is possible to manufacture a cylindrical shrink label that does not use a laser light absorber, is inexpensive, has less influence of environmental pollution, and is excellent in safety.

  The cylindrical shrink level of the present invention is excellent in production efficiency because it is welded in a cylindrical shape in a short time by irradiating a semiconductor laser beam or the like.

  The first of the present invention is a cylindrical shrink label formed by welding both ends of the label in the stretching direction of the heat-shrinkable base film, and the heat-shrinkable base film stretched uniaxially to a predetermined size in the stretching direction. Cut and cut out the label, the cut ends of the label are stacked vertically to form a label, and the overlapping portion and the lower label in the vicinity of the overlapping portion are combined with semiconductor laser light, fiber laser light, or disk laser light. The cylindrical shrink label is characterized in that the overlapped portion is welded with the laser beam.

  By using a longitudinally uniaxially stretched substrate film, it is possible to produce a cylindrical shrink label by transferring and cutting the film in the stretching direction, and stacking the cut surfaces in a cylindrical shape and welding them. At this time, it is not necessary to rotate the label direction by 90 degrees, and the structure of the labeler can be simplified as compared with the conventional case. Further, since the overlapping portion and the lower label in the vicinity of the overlapping portion are irradiated with the laser beam and the overlapping portion is welded, the label end portion is not turned over and the label surface is not melted, and the appearance is excellent. Hereinafter, the manufacturing method of the cylindrical shrink label of this invention, the container with a cylindrical shrink label, and a cylindrical shrink label is demonstrated.

(1) Configuration of cylindrical shrink label The cylindrical shrink label of the present invention is obtained by cutting a heat-shrinkable base film that has been longitudinally uniaxially stretched into a predetermined size in the stretching direction, and stacking the cut ends of the label up and down. It is formed into a cylindrical shape, and is prepared by irradiating the overlapped portion and the lower label near the overlapped portion with a semiconductor laser beam, a fiber laser beam or a disk laser beam, and welding the overlapped portion. By irradiating the laser beam also in the vicinity of the overlapping portion, it is possible to prevent the label edge from rising. In FIG. 1, the irradiation width (36) of the laser is shown by oblique lines. As shown in FIG. 1, the obtained cylindrical shrink label (100) has a laser welded portion (35) formed on the overlapping portion (37) at both ends of the label (30), The label extending direction indicated by the double arrow is the same direction. In addition, the front cut end on the label is welded and does not rise after heat shrinkage.

  The length and thickness of the cylindrical shrink label can be appropriately selected according to the shape of the container to be attached and the manner of attachment. On the other hand, the width of the laser welded part (35) is preferably 0.5 to 10 mm. A sufficient welding strength can be ensured within this range.

  Moreover, it is preferable that the width | variety part (37) of the welding part of the cylindrical shrink label for laser welding, and the irradiation width (36) of a semiconductor laser, a fiber laser, or a disk laser are 3-20 mm. If it is this range, a laser can be irradiated to the range (36) including two overlapping parts and one label part in the vicinity, and the laser welded part (35) can be sufficiently secured, and The cosmetics of the label can be ensured.

  In the cylindrical shrink label of the present invention, the peel strength between the labels, that is, the peel strength of the laser welded portion (35) is 0.5 to 30 N / 15 mm, more preferably 2.5 to 20 N / 15 mm. Can do. Further, the shear strength of the laser welded portion (35) is 2 to 65 N / 15 mm, more preferably 3.5 to 60 N / 15 mm. The peel strength and shear strength are numerical values described in the examples described later.

  One or more perforation lines may be formed in parallel with the laser welded portion of the overlapped portion. This is because it is easy to remove the label from the container after use.

(I) Heat-shrinkable base film The cylindrical shrink label of the present invention uses a heat-shrinkable base film that has been longitudinally uniaxially stretched.

  As the heat-shrinkable base film, a polyolefin film, a polyester film, a polystyrene film, a polylactic acid film, and a laminate film of two or more of these films, which are longitudinally uniaxially stretched, are preferably used. can do. More preferably, the polyolefin film is a longitudinally uniaxially stretched polypropylene film, the polyester film is a longitudinally uniaxially stretched polyethylene terephthalate film, and a longitudinally uniaxially stretched film of a polyester-polystyrene coextruded film. Conventionally, although a longitudinally uniaxially stretched film exists, the longitudinally uniaxially stretched film has not been used as a shrink label. However, in this invention, it discovered that a manufacturing process could be simplified by using a longitudinally uniaxially stretched film, and decided to use it limiting especially to a longitudinally uniaxially stretched film.

  Generally, one or more of polyolefin resin, polyester resin, polystyrene resin, polylactic acid resin is used, and extrusion method, cast molding method, T-die method, cutting method, inflation method, etc. Films formed in a single layer using the film-forming method, films formed by coextrusion using two or more resins, or films formed using a mixture of two or more resins What is used can be used, and various stretched films formed by longitudinal uniaxial stretching by a tenter method, a tubular method, or the like can be used.

  In the present invention, the thickness of the heat-shrinkable substrate film is not particularly limited, but is appropriately selected within a range that does not impair heat resistance, rigidity, mechanical suitability, appearance, etc. In the case of a non-foaming vertically uniaxially stretched film, 15 to 50 μm. This is because, within the above range, sufficient mechanical strength can be ensured and the welding strength with a semiconductor laser beam or the like is excellent when mounted on a container and used. The label thickness is a layer thickness before heat shrinkage.

  Various additives such as a lubricant, a filler, a heat stabilizer, an antioxidant, an ultraviolet absorber, an antistatic agent, a flame retardant, and a colorant are added to the heat-shrinkable base film as necessary. It may be. In addition, the surface of the heat-shrinkable base film may be subjected to conventional surface treatment such as corona discharge treatment, plasma treatment, flame treatment, and acid treatment in order to improve printability.

  In the present invention, as the heat-shrinkable base film, a film having a longitudinal heat shrinkage rate of 5 to 85%, more preferably 20 to 70% at a temperature of 100 ° C. can be suitably used. Since it has an excellent heat shrinkage rate, it can be suitably used for a container having a recess. In addition, the heat shrinkage rate in this invention is a heat shrinkage rate by 100 degreeC hot water, Comprising: The heat shrinkage rate of an extending | stretching direction shall follow a following formula. Therefore, in the case of a longitudinally uniaxially stretched film, the shrinkage direction is the film flow direction, and thus the thermal shrinkage rate with respect to the flow direction is 5 to 85%.

The size of the cylindrical shrink label of the present invention can be appropriately selected according to the size of the container to be pasted. Similarly, the size of the welded portion can be appropriately selected according to, for example, the usage mode of the label sticking device.

  In the present invention, a commercially available film may be used as the heat-shrinkable substrate film. PET longitudinally uniaxially stretched film (heat shrinkage rate: 100 ° C., 10 seconds, 50%), polypropylene longitudinally uniaxially stretched film (heat shrinkage rate: 80 ° C., 10 seconds; 10%, 100 ° C., 10 seconds, 25%), Longitudinal uniaxially stretched polystyrene with a maximum shrinkage of 19% in the longitudinal direction at 100 ° C and 70% at 130 ° C, such as "Polyphane FIT ST", a trade name of Polysack Plastic Industries Ltd. Film, manufactured by Eclone Mobil Co., Ltd., trade name “Label-Lyte-Roll-On-Sink-on LR210”, longitudinal uniaxially stretched polypropylene film such as maximum shrinkage of 18% in the longitudinal direction, longitudinally uniaxially stretched white polypropylene film, longitudinally uniaxially stretched A PLA film or the like can be preferably used.

  In the present invention, the “shrink label” is a label that can be shrunk by heat treatment. Therefore, it is a shrink label both before and after heat shrinkage.

(Ii) Laser Absorbing Layer The cylindrical shrink label of the present invention has a glass transition temperature (Tg) of the heat-shrinkable base film between the heat-shrinkable base film and the heat-shrinkable base film in the overlapped portion. It is preferable that a laser absorption layer made of a resin having a lower Tg than is laminated. Overlay the label edge so that it becomes a heat-shrinkable base film / laser absorption layer / heat-shrinkable base film, and irradiate semiconductor laser light, fiber laser light or disk laser light from any heat-shrinkable base film Then, the laser light passes through the heat-shrinkable base film and reaches the laser absorption layer, absorbs the energy of the laser light, softens the heat-shrinkable base film at the end, and the lower heat-shrinkable base material This is because welding with the film can be promoted.

  In this invention, it is preferable to use resin of Tg lower than the glass transition temperature of the said heat-shrinkable base film as a laser absorption layer. By laminating the laser absorption layer, the irradiation time can be shortened and productivity can be improved. As such resin, it can select suitably from resin which comprises an above described heat-shrinkable base film. More preferably, the same kind of resin as the heat-shrinkable base film is used. For example, when the heat-shrinkable base film is a polyester resin, the resin used for the laser absorption layer is also a polyester resin. When the heat-shrinkable base film is a polyolefin resin, it is used for the laser absorption layer. The resin to be used is also a polyolefin resin.

  Further, the laser absorption layer may further contain a laser absorber. Examples of such laser absorbers include ultraviolet absorbers, infrared absorbers, near-infrared absorbers, black carbon, printing ink pigments, printing ink dyes, aluminosilicates, fine silica powder, kaolin diatomaceous earth, epoxy resins, and polymethylmethacrylate. Examples thereof include fine particles such as acrylate. For this reason, a printing layer such as black ink printing can be used as the laser absorption layer. This is because the black ink used for black printing includes a black carbon that absorbs infrared rays as a pigment, and thus can be a laser absorption layer.

  On the other hand, black ink is black, so the color is limited. In the present invention, when a small amount of pearl pigment is used instead of a laser absorber such as black ink printing, the absorption rate of laser light can be increased without affecting other dyes and pigments because it is transparent and silver white, It has been found that the cosmetic properties of the cylindrical shrink label can be improved. It has been found that the incorporation of pearl pigment into the laser absorption layer improves the absorption of laser light. Therefore, in the present invention, a pearl pigment may be blended in the laser absorption layer in place of the laser absorber or together with the laser absorber. The pearl pigment is a pigment obtained by coating natural mica with a metal oxide such as titanium oxide or iron oxide. It is a fine powder having a white mica particle size of 5 to 130 μm, and may be a commercially available product. As such pearl pigments, for example, trade names “Laser Flare 800”, “Iriodin 100 Series”, “Iriodin 200 Series”, etc., manufactured by Merck & Co., Inc. can be used.

  In the present invention, the total amount of the laser absorber or the pearl pigment is preferably 3 to 80% by mass in the laser absorption layer. Within this range, the film absorbs the laser more efficiently and obtains sufficient heat for bonding, whereby welding with higher strength and production efficiency can be performed.

  The laser absorption layer is printed on or applied to the heat-shrinkable base film with a composition comprising the above-mentioned laser absorber or pearl pigment and a resin having a Tg lower than that of the resin constituting the heat-shrinkable base film. Can be formed.

(Iii) Design Print Layer The cylindrical shrink label (100) of the present invention may have a design print layer on the innermost label or the outermost layer of the heat-shrinkable base film. However, it is preferable that there is no printed layer between the heat-shrinkable base film and the heat-shrinkable base film when the superposed portion (37) is stacked in a cylindrical shape. This is because welding by semiconductor laser light, fiber laser light, or disk laser light may be hindered.

  There is no limitation in the printing method, for example, a printing layer can be formed by gravure printing. As the printing layer, one or more ordinary ink vehicles are prepared from a resin and a solvent, and if necessary, a plasticizer, a stabilizer, an antioxidant, a light stabilizer, an ultraviolet absorber, and a curing agent. 1 to 2 or more kinds of auxiliaries such as additives, crosslinking agents, lubricants, antistatic agents, fillers, etc. are optionally added, and further colorants such as dyes and pigments are added, and solvents, diluents, etc. The ink composition obtained by sufficiently kneading and adjusting the ink composition can be used.

  As such an ink vehicle, known ones such as sesame oil, drill oil, soybean oil, hydrocarbon oil, rosin, rosin ester, rosin modified resin, shellac, alkyd resin, phenolic resin, maleic resin, Natural resin, hydrocarbon resin, polyvinyl chloride resin, polyacetic acid resin, polystyrene resin, polyvinyl butyral resin, acrylic or methacrylic resin, polyamide resin, polyester resin, polyurethane resin, epoxy resin, urea resin , Melamine resin, amino alkyd resin, nitrocellulose, ethyl cellulose, chlorinated rubber, cyclized rubber, etc. can be used alone or in combination. The ink vehicle serves to carry the colorant from the plate to the substrate and fix it as a coating.

  Further, the drying property of the ink varies depending on the solvent. The main solvents used in printing inks are toluene, MEK, ethyl acetate, and IPA. Solvents with a low boiling point are used for quick drying. However, if the drying is too fast, the printed matter may be faded or printing may not be successful. Yes, a solvent having a high boiling point can be appropriately mixed. This makes it possible to print fine characters neatly. Colorants include dyes that are soluble in solvents and pigments that are insoluble in solvents, and gravure inks use pigments. Pigments are classified into inorganic pigments and organic pigments. Examples of inorganic pigments include titanium oxide (white), carbon black (black), and aluminum powder (gold and silver), and organic pigments are preferably azo. be able to.

  Although the above was demonstrated by gravure printing, printing systems, such as letterpress printing, screen printing, transfer printing, flexographic printing, etc., may be sufficient. The printing may be back printing or front printing.

  FIG. 5 shows the structure of a label that can be suitably used in the present invention. FIG. 5 (b) shows an aspect in which the printed layer (15) is printed on the back side except for both of the overlapping portions (37, 37 ′) of the laser welded portion of the heat-shrinkable base film (10). A mode in which the laser absorption layer (17) is printed on one side (37 ′) of the overlapping portion of the laser welded portion together with the layer (15) is shown. When FIG. 5A is formed into a cylindrical shape, it becomes a heat-shrinkable base film / heat-shrinkable base film, and FIG. 5B shows a heat-shrinkable base film / laser absorption layer / heat-shrinkable base film. Become a film.

(iv) Outer layer The cylindrical shrink label of this invention may provide an outer layer further on the surface side of the said heat-shrinkable base film. As such an outer layer, it can be appropriately selected depending on the use and design properties of the cylindrical shrink label, and OP varnish is given when the label surface is touched to give the label surface slipperiness. In some cases, it is preferable to use a printed layer of suede ink, and in the case of giving a matte feeling, a mat OP or the like. The outer layer can be a laminate of two or more layers, and a design print layer may be formed on the outer layer. However, it is preferable that a printed layer is not formed on the outer layer in the laser irradiation range (reference numeral 36 in FIG. 1) of the overlapping portion. In some cases, the label permeability of the laser beam is lowered, making welding difficult. At this time, it is preferable that the printing layer (15) containing black is not formed on the outer layer outside the overlapping portion (37 ′). It is because it may become easy to cut | disconnect.

(2) Container As a container to which the cylindrical shrink label of the present invention can be attached, a glass container; a synthetic resin container such as PET; an inorganic container such as a ceramic bottle; a metal container such as aluminum, iron, or SUS; It can be suitably mounted on a container made of a composite material including synthetic resin, ceramic, metal, paper and the like.

  On the other hand, when the container is a synthetic resin container, it is lightweight and mechanical to use a polyester resin such as PET and a polyolefin resin such as PP as the thermoplastic resin layer constituting the container. It is preferable because it is excellent in strength, heat resistance, gas barrier properties, chemical resistance, aroma retention, hygiene and the like. The container can be manufactured by injection molding, vacuum forming, pressure forming, or the like of polyester resin or polyolefin resin.

  As the shape of the container, the cross section of the container to which the cylindrical shrink label is attached is not limited to a round shape, and may be a polygonal shape such as a square or an octagon. Further, the container body to which the cylindrical shrink label is attached is not limited to the same diameter over the entire length of the body, and other than the case where the container body has a rectangular vertical section, for example, a gourd type There may be. Rather, in the present invention, since a longitudinally uniaxially stretched film having an excellent heat shrinkage rate is used, even if the container has an uneven shape, it can be suitably mounted. Therefore, as shown in FIG. 2, the minimum circumference (minimum circumference x 100 / maximum circumference (%)) with respect to the maximum circumference of the cylindrical shrink label mounting portion of the container is 50 to 100%, more preferably 70 to 90%, particularly preferably 75 to 85%, can be suitably used.

  FIG. 3 shows a container with a cylindrical shrink label after the cylindrical shrink label of the present invention is attached to the container of FIG.

(3) Manufacturing method of cylindrical shrink label (i) Preparation of label The label used by this invention can be prepared by forming a printing layer and a laser absorption layer suitably using a longitudinally uniaxially stretched film.

(Ii) Cylindrical forming of label The cylindrical shrink label of the present invention transports a heat-shrinkable base film formed by longitudinal uniaxial stretching in the stretching direction, cuts the film into a predetermined label length in the stretching direction, The label is attached to a vertically arranged cylinder, the cut end of the label is overlapped up and down to form an overlapped portion, the overlapped portion is sandwiched between the cylinder and the pressing tool, and the overlapping portion from the pressing tool side (37) and the laser beam irradiation width (3) composed of the lower label in the vicinity of the overlapped portion to irradiate laser light to form a welded portion (35) in the overlapped portion to form a cylindrical shrink label, A cylindrical shrink label can be manufactured. According to this method, since the film conveying direction and the stretching direction are the same direction, both ends in the stretching direction can be welded by forming the cut label into a cylindrical shape and overlapping the cut ends. That is, since the film cutting and label cylindrical welding can be performed only by moving the film in the horizontal direction, the step of rotating the label by 90 degrees as in the case of using a laterally uniaxially stretched film becomes unnecessary. Moreover, since the edge part of the cutting edge before a label is welded to a lower label, it becomes a cylindrical shrink label excellent in an external appearance even after heat shrink. Moreover, since it welds with laser beams, such as a semiconductor, it can adhere | attach without using an adhesive agent and can perform efficient welding in a short time. In addition, when the label is peeled off when recycling the container, the welded portion is not contaminated unlike the case of bonding with an adhesive, and the recyclability is excellent.

  More specifically, as shown in FIG. 4, the heat-shrinkable base film (10) is fed out so as to be attached to a vertically arranged cylinder (20), cut into a predetermined label length, and labeled (30). The cylinder (20) is rotated while rotating from the front end of the label, the label rear end is overlaid on the label front end, the label rear end is fixed with a pressing member such as a glass plate or a SUS plate, and indicated by oblique lines, The laser irradiation width (36) composed of the overlapping portion (35) and the lower label in the vicinity of the overlapping portion is welded by irradiating laser light from the pressing tool side, and a laser welding portion having a welding width of 0.5 to 10 mm ( 35) part can be formed and a cylindrical shrink label (100) can be manufactured. If the cylinder (20) to be used has a large number of air holes (25) for sucking or discharging air on its surface, the cylinder (20) is stable while sucking the cut label (30) on the cylinder surface. Can be attached. Further, if the cylinder (20) is rotated about the vertical direction, the label (30) can be easily attached. In general, the overlapping portion has a width of 3 to 20 mm. This overlapping portion can be stably irradiated with laser light by being fixed with a pressing member such as a glass plate.

  The present invention is characterized in that it is welded by irradiation with semiconductor laser light, fiber laser light or disk laser light, and the laser light is irradiated toward the cylinder from the side of the pressing tool such as a glass plate to be welded. Therefore, the pressing tool needs to transmit the laser beam. Examples of such a material include glass and quartz glass. In addition, a semiconductor laser light, a fiber laser light, or a disk laser light transmitting resin can be preferably used. In the present invention, a semiconductor laser beam, a fiber laser beam or a disk laser beam is used, and these all pass through a heat-shrinkable base film such as a PET film, so that the range of the laser beam irradiation width (36). This is because it is possible to produce a cylindrical shrink label having an excellent appearance without cutting a part of the label or melting the label surface. On the other hand, if a laser absorption layer is laminated between the heat-shrinkable base film and the heat-shrinkable base film in the superposed portion (37), the superposed portion can be welded in a short time, and as a cylindrical shrink label Practical adhesive strength can be ensured. Further, the overlapping portion can be avoided by fixing the overlapping portion with a pressing member such as a glass plate, quartz, semiconductor laser light, fiber laser light, or disc laser light transmitting resin. When a laser absorption layer is laminated between the heat-shrinkable base film and the heat-shrinkable base film in the overlapping portion (37), the presser is preferably a glass plate such as quartz glass. The laser beam reaches the laser absorbing layer through the glass plate and the heat shrinkable base film, and the laser absorbing layer is melted to efficiently weld the heat shrinkable base film and the heat shrinkable base film. Because it can.

  On the other hand, in the manufacturing method of the cylindrical shrink label of this invention, even when there is no laser absorption layer between the heat-shrinkable base film and the heat-shrinkable base film of the overlapping part (37), the heat-shrinkable base material The film and the heat-shrinkable base film can be welded in a short time. When the overlapping portion is sandwiched between metal pressers and irradiated with semiconductor laser light, fiber laser light or disk laser light from either metal presser side, the heat-shrinkable base sandwiched between the metal pressers This is because the material film can be welded. Specifically, when the cylinder (20) is made of metal such as SUS, a SUS plate may be used as a pressing tool, and the laser light may be irradiated from the SUS plate side. The shape of the presser is not limited to a plate shape. For example, two metal rods connected substantially in parallel may be used, and laser light may be irradiated from a place where there is no metal rod. The reason why welding can be achieved by sandwiching the overlapping part with a metal pressing tool is not clear, but the metal absorbs the laser beam and generates heat, while functioning as a reflector for the laser beam. As a result, the metal pressing tool It is considered that the heat-shrinkable base film sandwiched between the two is welded. In the present invention, since the label is wound around the cylinder (20), if the cylinder (20) is made of metal such as SUS, the overlapping portion (37) is formed with a pressing member made of SUS after forming the overlapping portion (37). 37), the laser welded portion (35) can be continuously formed on the overlapping portion (37) simply by irradiating the semiconductor laser light, the fiber laser light or the disk laser light from the SUS plate side. Thereby, even if it is a case where a laser beam absorber is not used, practical adhesive strength as a cylindrical shrink label is securable.

  The laser irradiation conditions are a spot diameter of 0.1 to 15 mm, an output of 5 to 500 W, and a processing speed of 1 to 300 mm / sec. Thereby, practical adhesive strength can be ensured.

(4) Manufacturing method of container with cylindrical shrink label The cylindrical shrink label container of the present invention is a cylindrical shrink label inserted into the cylindrical shrink label manufactured above by inserting the container from the upper part or the lower part of the label. It can be manufactured by mounting and then heat shrinking. In the following description, the case of a semiconductor laser will be described, but the same applies to the case of a fiber laser beam or a disk laser beam.

  For example, as shown in FIG. 6 and FIG. 7, (a) the label (30) is placed on the cylinder (20), (b) the overlapped portion (37) of the label cut end is formed and pressed with a presser (c ) A laser beam is irradiated from the side of the pressing tool with the laser beam irradiation width to form a laser welding part (35) in the overlap part (37) and welded in a cylindrical shape. Next, (d) the cylinder (20) is pulled out from below. Specifically, the cylinder (20) is provided with a large number of air holes (25). When the air is discharged from the air holes (25) of the cylinder (20) after welding with the semiconductor laser beam, the cylinder (20) Air can be sent between (20) and the label (30). When the cylinder (20) is moved downward from the lower end of the label in this state, the cylinder (20) can be easily pulled out from the cylindrical shrink label. (E) Thereby, the cylindrical shrink label (100) can be manufactured in a vertical state.

  Next, (f) the container (90) is lowered from the upper part of the cylindrical shrink label, (g) the cylindrical shrink label (100) is attached to the container (90), and then (h) heat shrinkage treatment is sequentially performed. The heat shrink treatment can be appropriately selected depending on the type and thickness of the heat shrinkable base film of the label, the stretching ratio, and the like. For example, the heat shrink treatment is performed with hot air at 60 to 230 ° C. or steam with condensation of water vapor and water vapor. The shrink label can be highly shrunk in the circumferential direction by applying radiant heat such as steam or infrared rays, and the body of the container can be covered with the shrink label. In addition, although the above showed the aspect which pulls out a cylinder (20) from the lower side of a cylindrical shrink label and inserts a container from an upper side, it pulls out from the upper side of a cylindrical shrink label and inserts a container from the lower side It is also possible to use this mode.

  In the present invention, as described above, the film can be cut and the label can be welded by simply moving the film in the horizontal direction. It can be carried out smoothly and easily, and the laser welding part can be carried out simply and reliably by irradiating the semiconductor laser light from the outside of the cylinder.

(5) Container with cylindrical shrink label The container with cylindrical shrink label of the present invention may be one in which the cylindrical shrink label (100) is mounted so as to cover the entire length of the container (90). (90) Only the upper part, only the lower part, only the lid part, etc. may be attached to only a part of the container. Furthermore, it is possible to heat-shrink so as to wrap the container bottom, or to attach a cylindrical shrink label to the entire bottom from the container lid and heat-shrink to cover the entire surface.

  EXAMPLES Next, although an Example is given and this invention is demonstrated concretely, these Examples do not restrict | limit this invention at all.

Example 1
Using a PET uniaxially stretched film (heat shrinkage rate: 100 ° C., 10 seconds, 50%, Tg 81 ° C.) with a width of 115 mm and a film thickness of 25 μm, label printing is printed on the back side of the label except for the welded portion. In addition, a polyester resin (trade name “Elitel UE3223”, Tg4 ° C.) and a pearl pigment (trade name “Laser Flare 820”, manufactured by Merck & Co., Inc.) are blended in a 1: 1 ratio at the rear end of the label. The laser absorption layer thus obtained was printed on the back so as to be 8 g / m ² and wound up in the stretching direction.

  The above-mentioned printing roll label was set on a labeler, fed out in the stretching direction, and cut into a length of 238 mm at a rotary cutter portion to obtain a single wafer label.

  The cut end portion of the single wafer label was wound around the cylinder while being sucked with air, an overlap of 4 mm was provided at both ends of the label, and a quartz glass plate was crimped to the overlapping portion and fixed. The overlapped portion becomes a design print layer / cylinder not including PET / laser absorption layer / PET / black from the glass plate side.

  The label overlapping part and the width of the lower label in the vicinity of the overlapping part were welded by irradiation with semiconductor laser light from the upper part of the glass plate. Irradiation is performed using a semiconductor excitation fiber laser, manufactured by Miyachi Technos, ML6500A, wavelength 1080 nm, maximum output 300 W, CW oscillation (continuous), spot size 1.2 mm, output 30 W, processing speed 400 mm / sec, welding width A 1.0 mm cylindrical shrink label was prepared.

  The laser-irradiated surface (PET) is not damaged by the laser beam in both the overlapping part (two parts) and the non-overlapping part (one part), and there is no unwelded part at the rear end of the label, and the appearance is good. It was. The adhesive strength was a shear strength of 7.5 N / 15 mm and a peel strength of 28 N / 15 mm.

  For the peel strength, the test piece was cut out to a length of 50 mm and a width of 15 mm, and the edge was peeled off to create a pinch. This was measured at a tensile speed of 300 mm / min by 180-degree peeling according to JIS K6854 using a tensile tester (Orientec), and evaluated by peel strength per 15 mm (unit: N / 15 mm). . In addition, the shear strength was measured at 300 mm / min according to JIS K6850 using a tensile tester by cutting a test piece into a length of 70 mm and a width of 15 mm.

  Next, the cylindrical shrink label was attached from the top of a 500 mL modified PET bottle, and the label was shrunk by heating at 95 ° C. for 10 seconds in a hot air type shrink tunnel.

  The obtained cylindrical shrink label did not peel off the welded part even during heat shrinkage. Further, the obtained shrink label mounting container did not drop off the label even when dropped from a height of 50 cm, and had sufficient welding strength. The results are shown in Table 1.

(Example 2)
Using a PET longitudinally uniaxially stretched film (heat shrinkage rate: 100 ° C., 10 seconds, 50%, Tg 81 ° C.) with a width of 860 mm and a film thickness of 25 μm, the label design is printed on the backside of the label, excluding the welded portion. In addition, a polyester resin (made by Unitika, trade name “Eritel UE9200”, Tg65 ° C.) and a pearl pigment (made by Merck, trade name “Laser Flare 820”) are blended 1: 1 at the welded portion at the rear end of the label. The laser absorbing layer thus obtained was printed on the back so as to be 3 g / m ^2, and 10 rows of labels with a width of 72 mm were slit and wound in the stretching direction.

  The above-mentioned printing roll label was set on a labeler, fed out in the stretching direction, and cut into a length of 238 mm at a rotary cutter portion to obtain a single wafer label.

  The cut end portion of the single-wafer label was wound around the cylinder while sucking with air, an overlap of 4 mm was provided at both ends of the label, and a glass plate was crimped to the overlapping portion and fixed. The overlapping portion is PET / laser absorption layer / PET / design printing layer / cylinder from the glass plate side.

  The label overlapping part and the width of the lower label in the vicinity of the overlapping part were welded by irradiation with semiconductor laser light from the upper part of the glass plate. As a semiconductor laser, an LD pumped fiber laser “ML6500A” manufactured by Miyachi Technos Co., Ltd. is used. Laser welding is performed at a spot diameter of 4.1 mm, an output of 30 W, and a processing speed of 400 mm / sec. Prepared.

  The laser-irradiated surface (PET) is not damaged by the laser beam in both the overlapping part (two parts) and the non-overlapping part (one part), and there is no unwelded part at the rear end of the label, and the appearance is good. It was. The adhesive strength was a shear strength of 20 N / 15 mm and a peel strength of 5 N / 15 mm.

  Next, the cylindrical shrink label was attached from the top of a 500 mL modified PET bottle, and the label was shrunk by heating at 95 ° C. for 10 seconds in a hot air type shrink tunnel.

  The obtained cylindrical shrink label did not peel off the welded part even during heat shrinkage. Further, the obtained shrink label mounting container did not drop off the label even when dropped from a height of 50 cm, and had sufficient welding strength. The results are shown in Table 1. The cross-sectional shape is shown in FIG.

(Example 3)
Using a polypropylene longitudinally uniaxially stretched film (heat shrinkage rate: 100 ° C., 10 seconds, 25%) having a width of 115 mm and a film thickness of 40 μm, the label design printing is printed back except for the welded portion at the rear end of the label, and 8 g / m ^{2 of} a laser absorption layer in which a pearl pigment (trade name “Laser Flare 820”, manufactured by Merck & Co., Inc.) is mixed 1: 1 with a polyolefin resin (trade name “Arrow Base”) in the welded portion at the rear end of the label. The back was printed so that

  The above-mentioned printing roll label was set on a labeler, fed out in the stretching direction, and cut into a length of 238 mm at a rotary cutter portion to obtain a single wafer label.

  The cut end portion of the single-wafer label was wound around the cylinder while sucking with air, an overlap of 4 mm was provided at both ends of the label, and a glass plate was crimped to the overlapping portion and fixed. The overlapped portion is PP / laser absorption layer / PP / design printing layer / cylinder from the glass plate side.

  The label overlapping part and the width of the lower label in the vicinity of the overlapping part were welded by irradiation with semiconductor laser light from the upper part of the glass plate. A cylindrical shrink with a welding width of 1.0 mm by welding with a laser processing width of 4 mm at a spot size of 1.2 mm, 750 W and a speed of 400 mm / sec using the product name “semiconductor laser CW type” manufactured by Miyachi Technos as a semiconductor laser. A label was prepared.

  The laser-irradiated surface (PP) is not damaged by the laser beam in both the label overlapping part (two parts) and the non-overlapping part (one part), and there is no unwelded part at the rear end of the label and the appearance is good. It was. The adhesive strength was a shear strength of 25 N / 15 mm and a peel strength of 6.2 N / 15 mm.

  Next, the cylindrical shrink label was attached from the top of a 500 mL modified PET bottle, and the label was contracted by heating at 120 ° C. for 10 seconds in a hot air type shrink tunnel.

  The obtained cylindrical shrink label did not peel off the welded part even during heat shrinkage. Further, the obtained shrink label mounting container did not drop off the label even when dropped from a height of 50 cm, and had sufficient welding strength. The results are shown in Table 1.

Example 4
Using a PET longitudinally uniaxially stretched film (heat shrinkage rate: 100 ° C., 10 seconds, 50%, Tg 81 ° C.) with a width of 860 mm and a film thickness of 25 μm, the label design is printed on the backside of the label, excluding the welded portion. Then, 10 rows of labels with a width of 72 mm were slit and wound in the stretching direction.

  The above-mentioned printing roll label was set on a labeler, fed out in the stretching direction, and cut into a length of 238 mm at a rotary cutter portion to obtain a single wafer label.

  The cut end portion of the single wafer label was wound around the cylinder while being sucked with air, an overlap of 4 mm was provided at both ends of the label, and a SUS plate having a thickness of 0.1 mm was fixed to the overlap portion by pressing. From the SUS plate side, the overlapped portion becomes PET (plain fabric) / PET / design printing layer / cylinder.

  The label overlapping part and the width of the lower label in the vicinity of the overlapping part were welded by irradiation with semiconductor laser light from the upper part of the SUS plate in the label overlapping part. As the semiconductor laser, LD pumped fiber laser manufactured by Miyachi Technos Co., Ltd., trade name “ML6500A” is used, laser welding is performed with a spot diameter of 4.1 mm, an output of 120 W, a processing speed of 100 mm / sec, and a cylindrical shrink with a welding width of 2.5 mm A label was prepared.

  The laser-irradiated surface (PET) is not damaged by the laser beam in both the overlapping part (two parts) and the non-overlapping part (one part), and there is no unwelded part at the rear end of the label, and the appearance is good. It was. The adhesive strength was a shear strength of 15 N / 15 mm and a peel strength of 3.8 N / 15 mm.

  Next, the cylindrical shrink label was attached from the top of a 500 mL modified PET bottle, and the label was shrunk by heating at 95 ° C. for 10 seconds in a hot air type shrink tunnel.

  The obtained cylindrical shrink label did not peel off the welded part even during heat shrinkage. Further, the obtained shrink label mounting container did not drop off the label even when dropped from a height of 50 cm, and had sufficient welding strength. The results are shown in Table 1.

(Comparative Example 1)
A cylindrical shrink label was produced in the same manner as in Example 1 except that the label overlap portion was irradiated with semiconductor laser light at a spot size of 0.96 mm to form a welding width of 1 mm in width. The adhesive strength was a shear strength of 24 N / 15 mm and a peel strength of 8.0 N / 15 mm. The appearance of this cylindrical shrink label is shown in FIG.

  Next, the cylindrical shrink label was attached from the top of a 500 mL modified PET bottle, and the label was shrunk by heating at 95 ° C. for 10 seconds in a hot air type shrink tunnel.

  The obtained cylindrical shrink label was turned up after the end of the label was cured after heat shrinkage. The results are shown in Table 1.

(Comparative Example 2)
A cylindrical shrink label was manufactured in the same manner as in Example 2 except that black printing was performed on the design print layer of the overlapping portion, the output was 120 W, and laser light was irradiated. The overlapping portion becomes a design printing layer / cylinder including PET / laser absorption layer / PET / ink printing from the glass plate side. As a result, the overlapping portion with two labels was welded, but the portion with one label was cut.

(Comparative Example 3)
A cylindrical shrink label was manufactured in the same manner as in Comparative Example 2 except that the output was changed to 80W. The overlapping portion becomes a design printing layer / cylinder including PET / laser absorption layer / PET / ink printing from the glass plate side. As a result, the adhesive strength was extremely weak with a peel strength of 0.8 N / 15 mm.

(Comparative Example 4)
The laser light irradiation conditions were as follows: COHIENT CO., DIAMOND K-250 (output 250W, 100Hz, wavelength 10.6μ) carbon dioxide laser, pulse interval 500μs, pulse width 19μs, processing speed 12m / min. A cylindrical shrink label was manufactured in the same manner as in Example 1 except that the laser beam was irradiated while shifting the focal length so that the welding line width was about 2 mm. Similar to Comparative Example 2, the overlapping portion with two labels was welded, but the portion with one label was cut.

  The cylindrical shrink label according to the present invention is formed into a cylindrical shape by welding with a semiconductor laser beam, can be manufactured with high productivity and without using an adhesive, Useful.

FIG. 1 is a perspective view for explaining a cylindrical shrink label of the present invention. FIG. 2 shows a container that can be used in the present invention, wherein the minimum peripheral diameter (minimum peripheral diameter × 100 / maximum peripheral diameter (%)) with respect to the maximum peripheral diameter in the label welded portion of the trunk is 50 to 100%. It is a figure explaining what has a recessed part. Drawing 3 is a figure showing an example of a desirable mode of a container with a cylindrical shrink label of the present invention. FIG. 4 is a diagram for explaining a process for producing the cylindrical shrink label of the present invention. FIG. 5 is a diagram for explaining a layer structure of a label that can be used in the present invention. FIG. 6 shows the steps of manufacturing a container with a cylindrical shrink label according to the present invention. (A) Labeling onto a cylinder, (b) Stacking of cut ends, (c) Laser welding portion of the overlapping portion, d) It is a figure explaining the downward movement of a cylinder. FIG. 7 shows the steps of manufacturing a container with a cylindrical shrink label of the present invention. (E) Vertical of the cylindrical shrink label, (f) Lowering of the container, (g) Mounting of the cylindrical shrink label on the container, (H) It is a figure explaining the container with a cylindrical shrink label which carried out the heat shrink process. It is a figure which shows the external appearance of the cylindrical shrink label manufactured by the comparative example 1. FIG. It is sectional drawing of the label welding part of Example 2. FIG.

Explanation of symbols

10 ... heat-shrinkable substrate film,
13 ... outer layer,
15 ... printing layer,
17 ... Laser absorption layer,
20 ... Cylinder,
25 ... Air holes,
30 ... label,
35 ... laser welding part,
36: Laser irradiation range,
37: Label overlapping part,
90 ... container,
100: A cylindrical shrink label.

Claims (11)

A cylindrical shrink label formed by welding both ends of the label in the stretching direction of the heat-shrinkable base film,
Cut the heat-shrinkable base film stretched uniaxially to a predetermined size in the stretching direction, cut out the label,
The label is formed into a cylindrical shape by overlapping the cut ends of the label up and down,
A cylindrical shrink label, wherein the overlapping portion and the lower label in the vicinity of the overlapping portion are irradiated with semiconductor laser light, fiber laser light, or disk laser light, and the overlapping portion is welded with the laser light.   Between the heat-shrinkable base film and the heat-shrinkable base film in the overlapped portion, a laser absorption layer made of a resin having a Tg lower than the glass transition temperature of the heat-shrinkable base film is laminated, and the laser 2. The cylindrical shrink label according to claim 1, wherein the overlapping portion is welded by irradiating a laser absorption layer with light.   The cylindrical shrink label according to claim 2, wherein the laser absorption layer further contains a laser light absorber and / or a pearl pigment.   The heat-shrinkable base film is a polyolefin-based film, a polyester-based film, a polystyrene-based film, a polylactic acid-based film, or a laminate film of two or more of these films, and the heat shrinkage rate in the vertical direction is 100 The cylindrical shrink label according to any one of claims 1 to 3, which is 5 to 85% at ° C.   The cylindrical shrink label according to claim 4, wherein the polyolefin film is a longitudinally uniaxially stretched polypropylene film, and the polyester film is a longitudinally uniaxially stretched polyethylene terephthalate film.   The said cylindrical shrink label has a design printing layer in the label innermost layer or outermost layer of a heat-shrinkable base film, The cylindrical shrink label in any one of Claims 1-5 characterized by the above-mentioned.   A container with a cylindrical shrink label, which is provided with the cylindrical shrink label according to any one of claims 1 to 6 and subjected to a heat shrink treatment.   The said container has a recessed part whose minimum circumference with respect to the maximum circumference of the cylindrical shrink label mounting part of a container (minimum circumference x100 / maximum circumference (%)) is 50-100%, It is characterized by the above-mentioned. Item 8. A container with a cylindrical shrink label according to Item 7. A heat-shrinkable base film formed by uniaxial stretching is conveyed in the stretching direction,
Cutting the film into a predetermined label length in the stretching direction,
The label is attached to a vertically arranged cylinder, the cut ends of the label are stacked up and down to form an overlapped portion,
The overlap portion is sandwiched between the cylinder and the presser,
Forming a cylindrical shrink label by irradiating the overlapping portion and the lower label near the overlapping portion from the pressing tool side with semiconductor laser light, fiber laser light or disk laser light to weld the overlapping portion. A method for producing a cylindrical shrink label, which is characterized.   The method for manufacturing a cylindrical shrink label according to claim 9, wherein the cylinder and the pressing member are both made of metal. A heat-shrinkable base film formed by uniaxial stretching is conveyed in the stretching direction,
Cutting the film into a predetermined label length in the stretching direction,
The label is attached to a vertically arranged cylinder, the cut ends of the label are stacked up and down to form an overlapped portion,
The overlap portion is sandwiched between the cylinder and the presser,
Irradiate semiconductor laser light, fiber laser light or disk laser light to the overlapping portion and the lower label in the vicinity of the overlapping portion from the presser side to form the cylindrical shrink label by welding the overlapping portion,
The cylinder is extracted from the lower side or the upper side of the cylindrical shrink label, and a container is inserted from the upper side or the lower side of the label, and the cylindrical shrink label is attached to the container,
Next, a method for producing a container with a cylindrical shrink label, which is subjected to heat shrinkage treatment.