JP2013049459A - Shrink label container and wrapping type shrink label - Google Patents

Abstract

[PROBLEMS] To suppress curling due to thermal contraction of an end portion located on an outer side in a bonding portion in a container having a winding type shrink label that is formed into a cylindrical shape while being wound.
In a single wafer type shrink film, winding is performed such that the back surface of the other end portion is bonded to the surface of the one end portion in the main stretching direction M so as to be in a cylindrical shape and in close contact with the container by heat shrinkage. A container with a shrink label provided with a shrink label 50 of a mold, and an ink layer 8 as a shrinkage inhibition process for inhibiting the thermal shrinkage is bonded to the edge 11a of the other end portion 11 of the shrink label 50 It is applied over the entire length of 30. The ink layer 8 is wider than the uncoated area 6.
[Selection] Figure 3

Description

  The present invention relates to a container with a shrink label to which a winding type shrink label that is formed into a cylindrical shape while being wound, and a winding type shrink label.

  Conventionally, both sides of a long shrink film with the short direction as the main stretching direction are bonded together to form a long cylindrical shape, which is wound into rolls and cut into predetermined lengths while being sequentially fed out. In addition to forming a cylindrical shrink label, a method has been adopted in which the formed cylindrical shrink label is sequentially put on a container and fed into a shrink tunnel, where the shrink label is thermally contracted and closely adhered to the container. .

  On the other hand, in recent years, a long shrink film having a longitudinal direction as a main stretching direction is cut at a predetermined length to form a shrink label made of a single-wafer type shrink film, and the shrink label is used as a container or the like. A winding-type shrink label is also proposed in which both ends in the main stretching direction are bonded to each other while being wound around, and then heat-shrinked so as to be in close contact with the container (see Patent Document 1 below).

  However, since the wrapping type shrink label is formed into a cylindrical shape while being wound, the end portion of the shrink label positioned outside in the bonding portion is easily curled outward due to thermal contraction, detracts from aesthetics, and is being conveyed. In this case, the end portion is likely to be caught, and the shrink label may be damaged.

  On the other hand, although it is a conventional type rather than a wrapping type shrink label, the curling at the upper and lower ends of the bonded portion is suppressed and the label is easily peeled off from the container as in Patent Document 2 below. Proposals have also been made. However, it is necessary to bond only the upper and lower ends of the bonded part in a different adhesive state from the other parts, which makes it difficult to manufacture and suppresses curling in other parts such as the central part of the bonded part. Can not do it.

JP 2011-128249 A JP 2010-64771 A

  Therefore, the present invention has been made in view of the above-mentioned conventional problems, and in a container with a shrink label to which a winding type shrink label that is formed into a cylindrical shape while being wound, and the shrink label of the winding type, the outer side at the bonding portion is provided. It is an object of the present invention to suppress curling due to thermal contraction of an end portion located.

  The present invention has been made to solve the above-mentioned problems, and the shrink-labeled container according to the present invention has a back surface of the other end bonded to the surface of one end in the main stretching direction of the single-wafer shrink film. A shrink-labeled container provided with a wrapping-type shrink label that is combined into a tubular shape and is in close contact with the container by heat shrinkage, and inhibits the heat shrinkage at the edge of the other end of the shrink label For this reason, the shrinkage inhibition process is performed over the entire length of the bonded portion.

  The shrink label attached to the container with the shrink label having the above structure is one end of the shrink film in the main stretching direction while being wound around the container, or when being wound around the drum once before being fitted into the container. By attaching the back surface of the other end to the surface of the part, it is cylindrical. When wound around a container, it is directly put into, for example, a shrink tunnel and thermally contracted. When wound around a drum, a cylindrical shrink label is fitted on the container and then contracted by a shrink tunnel or the like. The shrink label comes into close contact with the container by this heat shrinkage. The edge of the other end located on the outer side of the bonding part is subjected to shrinkage inhibition treatment over the entire length of the bonding part. Thermal contraction at the end is suppressed.

  In particular, an ink layer is preferably formed as a shrinkage inhibiting process on the surface of the other end portion of the shrink label and in a region having a predetermined width from the edge. Since the ink layer inhibits thermal shrinkage in the vicinity of the edge of the surface of the other end portion over the entire length of the bonded portion, curling is reliably suppressed in the vicinity of the edge, which is a particularly easily curled portion.

  Further, an adhesive layer for bonding is formed on the back surface of the other end portion of the shrink label at a position spaced a predetermined distance from the edge of the other end portion, and an adhesive agent is formed on the back surface of the other end portion. It is preferable that an uncoated region, which is a region where no layer is formed, is formed with a predetermined width from an edge, and the ink layer is formed wider than the uncoated region. For example, if an adhesive layer having a predetermined width is formed at regular intervals on the back surface of a long shrink film having the main stretching direction as the longitudinal direction, and the blade is cut with a blade so as to bisect the adhesive layer, the blade Adhesive is easy to adhere to. In order to prevent the adhesive from adhering to the blade, two rows of adhesive layers formed at predetermined intervals are formed in advance with a gap therebetween, and an uncoated region between the two rows of adhesive layers is formed on the blade. It can be a cutting position. In this way, when a single wafer type shrink label is formed, an uncoated area is formed from the edge to a predetermined width on the back surface of both ends in the main stretching direction of the film, and an adhesive is provided next to the uncoated area. The layer will be located. If only one row of adhesive layers is formed instead of two rows and the position adjacent to the adhesive layer is set as the cutting position, the uncoated region and the adhesive layer are formed only on the back surface of the other end. Also, even when applying an adhesive just before it is wrapped around a container, in order to prevent the adhesive from protruding from the edge of the shrink label, instead of applying the adhesive to the edge of the edge, instead of applying the adhesive to the edge, The adhesive is applied at a predetermined distance. In any case, at least the adhesive layer on the back surface of the other end portion of the shrink label is not formed to the end edge, but is formed at a position separated from the end edge by a predetermined distance. An uncoated area where no adhesive is applied is formed with a predetermined width from the edge on the back surface. When an uncoated area is formed on the back surface of the other end portion of the shrink label in this way, the end edge of the other end portion is not bonded to the surface of the one end portion, so that it tends to float outward, and the vicinity of the end edge is heated. Shrinkage makes it easier to curl outward. Therefore, in the case where an uncoated area is formed on the back surface of the other end of the shrink label, it is preferable to form an ink layer wider than the uncoated area on the surface of the other end. This will surely suppress curling.

  In addition, an ink layer that is narrower than the ink layer formed on the surface of the other end portion is formed on the surface of one end portion of the shrink label at a predetermined width from the edge, and the main stretching direction is the longitudinal direction. When the long shrink film is cut into predetermined lengths to form a single wafer type shrink film, the original ink layer formed on the surface of the long shrink film is divided. It is preferable that an ink layer on the surface of the other end and an ink layer on the surface of the one end are formed by cutting. If the long shrink film is cut so as to divide the original ink layer formed on the surface, the ink layer is surely formed up to the edge of the other end of the shrink label. Moreover, since the width of the ink layer on one end side is narrower than the width of the ink layer on the other end side, most of the original ink layer can be positioned on the other end side, and the original ink layer It can be used efficiently for the shrinkage inhibition treatment, and the width of the ink layer on the other end side can be sufficiently secured to suppress curling.

  On the other hand, as the shrinkage inhibition treatment, it is also preferable that the edge of the other end of the shrink label is heat-treated in advance before the heat shrinkage. If the edge of the other end of the shrink label has been heat-treated in advance before the heat shrinkage to adhere to the container, when the entire shrink label is thermally shrunk by a shrink tunnel or the like, the vicinity of the edge of the other end In the case, heat shrinkage is suppressed and curling is suppressed.

  In this case, it is particularly preferable that the edge of the other end of the shrink label is cut with a laser. The edge of the other end of the shrink label is locally heat-treated by the irradiation of the laser beam. That is, the edge of the other end portion of the shrink label is melted to have a rounded shape. By cutting with a laser in this way, cutting of the shrink film and heat treatment of the edge can be performed simultaneously in one step, and only the edge can be reliably heat-treated locally.

  The winding type shrink label according to the present invention is composed of a single-wafer type shrink film, and the film is wound in such a manner that the back surface of the other end is bonded to the surface of one end in the main stretching direction of the film. The shrink label of the mold is characterized in that a shrinkage inhibition process for inhibiting thermal shrinkage is applied to the edge of the other end portion over the entire length of the bonded portion.

  In particular, an ink layer is formed as a shrinkage inhibiting process on the surface of the other end part and having a predetermined width from the edge, or the edge of the other end part is heat treated as a shrinkage inhibiting process. preferable.

  As described above, the shrink-labeled container and the wrapping-type shrink label according to the present invention suppress the thermal contraction of the other end portion of the shrink label by the shrinkage inhibition process, and thus curling the other end portion due to the thermal contraction is suppressed. As a result, good aesthetics can be obtained and damage to the shrink label at the bonded portion can be prevented.

Sectional drawing which shows the winding type shrink label in one Embodiment of this invention. The front view which shows the state which wound the shrink label around the container. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. The state in the middle of manufacture of the said shrink label is shown, (a) is the figure seen from the front side, (b) is the figure seen from the back side. Sectional drawing which shows the state in the middle of manufacture of the shrink label. The figure which looked at the state in the middle of manufacture of the winding type shrink label in other embodiment of this invention from the back side. (A) And (b) is the figure which looked at the state in the middle of manufacture of the winding type shrink label in other embodiment of this invention from the back side. Sectional drawing which shows the winding type shrink label in other embodiment of this invention. The principal part sectional drawing which shows the state which made the winding type shrink label in other embodiment of this invention the cylinder shape.

  Hereinafter, a winding type shrink label according to an embodiment of the present invention and a container with a shrink label mounted thereon will be described with reference to FIGS. The shrink label 50 in the present embodiment is composed of a single-wafer type shrink film 1 having a predetermined length and width with the arrow M as the main stretching direction, as shown in FIG. That is, the shrink label 50 has a rectangular shape and is a single wafer type in which one direction is a main extending direction. The main extending direction indicated by an arrow M in FIG. 1 is the circumferential direction when the shrink label 50 becomes cylindrical, and the direction orthogonal to the main extending direction M is when the shrink label 50 becomes cylindrical. Is the axial direction.

  A printed layer 2 is formed on the back surface of the shrink film 1. The print layer 2 is formed on the entire back surface of the shrink film 1. And the adhesive layers 3 and 4 for bonding are formed in the both ends 10 and 11 of the main extending direction M among the back surfaces of the shrink film 1, respectively. The adhesive layers 3 and 4 are formed over the entire length in the direction orthogonal to the main stretching direction M. The adhesive layers 3 and 4 are formed at positions spaced apart from the respective edges 10a and 11a by a predetermined distance, and the adhesive layer 3 is interposed between the edges 10a and 11a and the adhesive layers 3 and 4. , 4 are not formed, and uncoated areas 5 and 6 are formed. Since the adhesive layers 3 and 4 are formed over the entire length in the direction orthogonal to the main stretching direction M, the uncoated areas 5 and 6 are also formed over the entire length in that direction. The width of the adhesive layers 3 and 4 is, for example, about 10 mm, and the width of the uncoated areas 5 and 6 is narrower than that, for example, about 1 mm.

  On the surface of the shrink film 1, ink layers 7 and 8 are formed as shrinkage inhibition treatments for inhibiting thermal shrinkage at both ends 10 and 11 in the main stretching direction M, respectively. The ink layer 7 at one end 10 in the main stretching direction M and the ink layer 8 at the other end 11 are formed over the entire length in the direction orthogonal to the main stretching direction M, and are separated from the edges 10a and 11a, respectively. It is formed without. The ink layer 7 at the one end 10 is narrower than the ink layer 8 at the other end 11. In addition, the ink layer 8 at the other end 11 is wider than the uncoated region 6 and is formed so as to cover the entire surface side of the uncoated region 6. The ink layer 8 at the other end 11 is narrower than the adhesive layer 4 and is, for example, about 5 mm. As described above, the ink layers 7 and 8 are formed only on the both end portions 10 and 11 of the surface of the shrink film 1.

  As the shrink film 1, various heat-shrinkable films such as a polyester film, a polystyrene film, and a polyolefin film can be used. Examples of the adhesive used as the adhesive layers 3 and 4 include hot melt, delay, and part coat. The printed layer 2 on the back surface and the ink layers 7 and 8 on the front surface are formed by gravure printing, for example, and are preferably acrylic inks, but various gravure inks such as urethane-based ones can be used. The ink may or may not contain a pigment, and may be a UV curable ink.

  As shown in FIG. 4, the shrink label 50 having such a configuration is formed by cutting a long shrink film 20 having a longitudinal direction as a main stretching direction M for each predetermined length. FIG. 4A shows the front surface, and FIG. 4B shows the back surface, and the cut position 21 is indicated by a dashed line. As the cutting means, for example, a blade such as a rotary blade or a Thomson blade can be used. As shown in FIG. 4 (a), the surface of the long shrink film 20 is formed with an original ink layer 22 (a region with a large number of dots) having a predetermined width at regular intervals. The cut position 21 is determined so as to divide the original ink layer 22 at a position biased to one side instead of the center, and the original ink layer 22 is cut at that position. FIG. 5 shows a state immediately after the cutting, and if the original ink layer 22 is cut in such a manner as described above, the ink layer 8 can be formed up to the edge 11 a of the surface of the other end portion 11. Can do. A narrow ink layer 7 is also formed on the surface of the one end 10. Further, as shown in FIG. 4B, two rows of adhesive layers 3 and 4 (cross-hatched portions) are formed on the back surface of the long shrink film 20 at regular intervals. An uncoated region 23 without an adhesive layer is formed between the two rows of adhesive layers 3 and 4, and the vicinity of the center of the uncoated region 23 is cut as a cutting position 21. In FIG. 4B, the region with a large number of dots is the printed layer 2 on the back side. Thus, if the long shrink film 20 is cut by setting the cut position 21 in the unapplied region 23 where the adhesive is not applied, the adhesive does not adhere to the blade, and the cutting process is highly efficient. There are few restrictions on the selection of the adhesive.

  The shrink label 50 formed in this way becomes a cylinder by being wound around the container 40 as shown in FIGS. Specifically, it is adhered to the container 40 by the adhesive layer 3 on the back surface of the one end portion 10, and the back surface of the other end portion 11 is attached to the surface of the one end portion 10 by the adhesive layer 4 on the back surface of the other end portion 11. Adapted. The ink layer 8 on the surface of the other end portion 11 as the shrinkage inhibition process is formed over the entire length of the bonded portion 30 as shown in FIG. After that, the container 40 to which the shrink label 50 is bonded is sent to the shrink tunnel, and the shrink label 50 is thermally contracted to adhere to the container 40. At this time, the ink layer 8 is formed on the surface of the other end portion 11. Since it forms over the full length of the bonding part 30, the thermal contraction in the other end part 11 is suppressed, and generation | occurrence | production of a curl can be suppressed. Further, an uncoated region 6 is formed on the back surface of the other end portion 11 so that the vicinity of the end edge 11a of the other end portion 11 is easily lifted, but the other end portion is formed by the ink layer 8 on the surface of the other end portion 11. 11 curl in the vicinity of the end edge 11a. In particular, since the ink layer 8 on the surface of the other end portion 11 is wider than the uncoated region 6, curling of the other end portion 11 is reliably suppressed. In addition, since the ink layer 8 on the surface of the other end portion 11 is narrower than the adhesive layer 4, the ink layer 8 is not excessively conspicuous and maintains a good aesthetic appearance.

  Instead of forming two rows of adhesive layers 3 and 4 on the back side, only one row of wide adhesive layers 25 is formed as shown in FIG. 6, and the wide adhesive layer 25 is divided into two substantially at the center. You may cut it. In this case, it is preferable to use an adhesive that is difficult to adhere to the blade. When cut in this manner, the uncoated areas 5 and 6 are not formed in the vicinity of the edge 10a on the back surface of the one end 10 and the position in the vicinity of the edge 11a of the back surface of the other end 11, and the adhesive layer 3 and 4 are formed to the edge 10a and 11a, but even in such a case, by forming the ink layer 8 on the surface of the other end portion 11, the thermal contraction of the other end portion 11 can be prevented. The occurrence of curling can be suppressed.

  Further, as shown in FIGS. 7A and 7B, only one row of the adhesive layer 4 may be formed and the adjacent position may be cut as the cut position 21. In this case, the adhesive layer 4 is formed only on the back surface of the other end portion 11, and no adhesive layer is formed on the back surface of the one end portion 10. Further, an uncoated region 6 is formed in the vicinity of the edge 11 a on the back surface of the other end portion 11. In this case, the shrink label 50 is not directly wound around the container 40 but is once wound around a drum to form a cylinder, and the tubular shrink label 50 is fitted on the container 40. For example, a suction hole may be formed in the drum so that the wound shrink label 50 is sucked and held. Instead of forming the entire printed layer 2 on the back side, printing is performed on both ends (or one end) of the long shrink film 20 in the short direction (width direction) as shown in FIG. 7B. The clear region 24 without the layer 2 may be continuously formed along the longitudinal direction, and this is the same when the adhesive layers 3 and 4 are formed in two rows.

  Further, as shown in FIG. 8, a clear region 24 having a predetermined width may be provided over the entire length without forming the printing layer 2 on the back surface of the other end portion 11. That is, a clear region 24 having a predetermined width is formed on the back surface of the other end portion 11 along the direction orthogonal to the main stretching direction M over the entire length. By not providing the printing layer 2 on the back surface of the other end part 11, the curling of the other end part 11 due to thermal contraction is further suppressed. In that case, the adhesive layer 4 may be provided up to the edge of the printing layer 2, or the adhesive layer 4 may extend to the clear region 24 as shown in FIG. That is, the uncoated area 6 and the clear area 24 may have the same width, and the clear area 24 may be wider than the uncoated area 6 as shown in FIG.

  In addition, although the ink layers 7 and 8 were provided only on both ends 10 and 11 in the surface of the shrink film 1, the ink layer 8 may be provided only on the surface of the other end 11 of the shrink film 1.

  In the above-described embodiment, the ink layer 8 is formed on the surface of the other end portion 11 as the shrinkage inhibition process. However, the heat shrinking step for bringing the edge 11a of the other end portion 11 into close contact with the container 40 as the shrinkage inhibition process. Prior to this, heat treatment may be performed in advance. That is, the shrink label 50 is put in a shrink tunnel or the like in a state of being attached to the container 40 and is thermally contracted to adhere to the container 40, but the other end portion 11 is in a state before being attached to the container 40. By heat-treating the vicinity of the edge 11a in advance, the shrinkage performance of the film 1 in the vicinity of the edge 11a of the other end 11 is removed and extinguished. By doing so, when the shrink label 50 is thermally contracted and is in close contact with the container 40, the shrink label 50 is not thermally contracted in the vicinity of the edge 11 a of the other end portion 11, and thus curling at the other end portion 11 is suppressed. .

  As a heat treatment of the edge 11a of the other end portion 11, there is a method of irradiating a laser beam. That is, instead of cutting with a blade as described above, the long shrink film 20 is cut by irradiating the cutting position 21 with a laser beam. When the long shrink film 20 is cut with the laser beam in this way, both edges 10a and 11a of the shrink label 50 are heat-treated simultaneously with the cutting. FIG. 9 shows a case where the shrink label 50 formed by cutting with a laser in this way is formed into a cylindrical shape. As shown in FIG. 9, the end 11a of the other end 11 and the end of the one end 10 are shown. Both edges 10a are heat-treated by laser and become rounded by melting. After this, even if the heat shrinks in a shrink tunnel or the like, the edge 11a of the other end portion 11 and the edge 11a of the one end portion 10 hardly change from the state, and the occurrence of curling at both end portions 10 and 11 is suppressed. . Moreover, when using a laser, heat treatment can be performed in a non-contact manner, heat can be applied locally, and heat treatment and cutting can be performed in a single process, resulting in production efficiency. Is also excellent.

  However, various methods other than the laser irradiation method can be adopted as the heat treatment method. For example, there are a method of cutting with ultrasonic waves and a method of a heat cutter that cuts while applying heat, and even when cutting with these methods, both end edges 10a and 11a are melted and rounded as described above. Since it becomes a tinged shape and the shape is maintained even after heat shrinkage, it can be determined whether or not the edge 11a of the other end portion 11 has been preheated before heat shrinkage even after heat shrinkage. There is also a method in which a hot plate is applied in the vicinity of the cut position 21 to eliminate the orientation of the film 20 at the contact portion and then cut. When the orientation of the film 20 is partially lost in this way, the presence or absence of heat treatment is determined by confirming the molecular orientation of the edge 11a through a polarizing plate with a CCD camera or by X-ray diffraction. This discrimination is possible even after heat shrinkage. Even when heat treatment is performed in this way, curling can be more reliably suppressed if the ink layer 8 is also formed on the surface of the other end portion 11.

  In addition to the heat treatment method, for example, the heat shrinkage may be inhibited by applying an electron beam to the cut position 21 of the film 20 to break the molecular bond at that portion.

  Note that the adhesive layer 3 and the adhesive layer 4 were previously formed on the single-wafer shrink label 50, but the adhesive was applied to the back surface of the shrink label 50 just before the shrink label 50 was wound. Layer 3 and adhesive layer 4 may be formed. Even when the adhesive is applied to the back surface of the shrink label 50 just before being wound around the container 40 or the drum, the adhesive layers 3 and 4 are applied by applying the adhesive at a position spaced a predetermined distance from the edge 10a and the edge 11a. By forming the adhesive, the adhesive does not protrude outward from the edge 10a or the edge 11a due to the pressing force during bonding. In particular, an adhesive may be applied so that the uncoated region 6 is formed on the back surface of the other end portion 11 so that the adhesive layer 4 does not protrude from the edge 11a of the other end portion 11 located outside.

DESCRIPTION OF SYMBOLS 1 Shrink film 2 Printing layer 3 Adhesive layer 4 Adhesive layer 5 Unapplication area | region 6 Unapplication area | region 7 Ink layer 8 Ink layer 10 One end part 10a Edge 11 Other end 11a Edge 20 Long-form shrink film 21 Cut Position 22 Original ink layer 23 Unapplied area 24 Clear area 25 Adhesive layer 30 Bonding part 40 Container 50 Shrink label M Main stretching direction

Claims (9)

Shrink label provided with a wrapping type shrink label in which the back surface of the other end is bonded to the surface of one end in the main stretching direction of a single wafer type shrink film and is in a cylindrical shape and is in close contact with the container by heat shrinkage A container with
A shrink-labeled container, characterized in that a shrinkage inhibition process for inhibiting the thermal shrinkage is applied to the edge of the other end of the shrink label over the entire length of the bonded portion.   The container with a shrink label according to claim 1, wherein an ink layer is formed as a shrinkage inhibiting process on a surface of the other end of the shrink label and in a region having a predetermined width from the edge.   An adhesive layer for bonding is formed on the back surface of the other end portion of the shrink label at a position spaced a predetermined distance from the edge of the other end portion, and an adhesive layer is formed on the back surface of the other end portion. The container with shrink labels according to claim 2, wherein an uncoated area, which is an unformed area, is formed with a predetermined width from an edge, and the ink layer is formed wider than the uncoated area.   An ink layer that is narrower than the ink layer formed on the surface of the other end is formed on the surface of one end of the shrink label and in a region having a predetermined width from the edge, and the main stretching direction is the longitudinal direction. When a long shrink film is cut into predetermined lengths to form a sheet-fed shrink film, the original ink layer formed on the surface of the long shrink film is cut so that it is divided. The container with a shrink label according to claim 2 or 3, wherein an ink layer on the surface of the other end and an ink layer on the surface of the one end are formed by cutting the shrink film.   The container with a shrink label according to any one of claims 1 to 4, wherein an edge of the other end portion of the shrink label is heat-treated in advance before the thermal shrinkage as the shrinkage inhibiting process.   The container with a shrink label according to claim 5, wherein the edge of the other end of the shrink label is cut with a laser. It is composed of a single-wafer type shrink film, and is a wrapping type shrink label in which the back surface of the other end is bonded to the surface of one end in the main stretching direction of the film to form a cylinder,
A shrinkable shrink label characterized in that a shrinkage inhibition process for inhibiting thermal shrinkage is applied to the edge of the other end part over the entire length of the bonded part.   The wrapping type shrink label according to claim 7, wherein an ink layer is formed as a shrinkage inhibiting process on the surface of the other end portion and in a region having a predetermined width from the edge.   The winding type shrink label according to claim 7 or 8, wherein the edge of the other end is heat-treated as the shrinkage inhibiting treatment.

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