JP2013189219A - Rectangular container with shrink label, rectangular container, and shrink label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container with a shrink label which prevents a crease from being caused in a shrink label at the corner portions of the sidewalls of the container, and a rectangular container, and a shrink label.SOLUTION: A rectangular container with a shrink label has a shrink label mounted on the sidewalls 11 of the rectangular container rectangular in a cross-sectional view. The external surfaces of the wall surface portions 20 and 21 other than the corner portions 22 in the sidewalls 11 of the container 1 are made as smooth surfaces, and vertical grooves 23 are formed in an external surface of at least one of the corner portions 22 of the sidewalls 11 of the container 1. The formation of the vertical grooves 23 on the corner portions 22 makes the circumferential frictional resistance between themselves and the shrink label 2 relatively small in the corner portions 22, and relatively large in the wall surface portions 20 and 21.

Description

  The present invention relates to a rectangular container with a shrink label in which a shrink label is attached to a rectangular container, a rectangular container used for the rectangular container with a shrink label, and a shrink label.

  Shrink labels are used in various containers. When a shrink label is attached to a container, the shrink label is heated and contracted by steam or the like (Patent Documents 1 and 2 below), but no wrinkles or the like are generated on the shrink label in order to ensure aesthetics. It is demanded to contract.

  However, it has been found that when the side wall of the container is square in a cross sectional view, wrinkles are likely to occur on the shrink label at the corner of the side wall. The cause is not necessarily clear, but it was considered that the shrink label could not move smoothly in the circumferential direction at the corner of the side wall when the shrink label contracted.

JP 2002-46715 A JP-A-7-156930

  Therefore, the present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a rectangular container with a shrink label, a rectangular container, and a shrink label, in which wrinkles of the shrink label are unlikely to occur at the corners of the side wall of the container.

  The present invention has been made to solve the above problems, and a rectangular container with a shrink label according to the present invention is a rectangular container with a shrink label in which a shrink label is attached to a side wall of a container having a rectangular shape in cross section. And at least one of the outer surface of the side wall and the inner surface of the shrink label at at least one corner of the side wall of the container has a circumferential frictional resistance between the shrink label and the side wall of the container at the corner of the side wall of the container. An easy-sliding portion for reducing the friction resistance in the wall surface portion other than the corner portion of the side wall is formed.

  In the rectangular container with a shrink label having the above structure, an easily sliding portion is formed on at least one of the outer surface of the side wall and the inner surface of the shrink label at at least one corner of the side wall of the container. The shrink label can smoothly move in the circumferential direction and heat shrink.

  In particular, when the easy-sliding portion is provided on the container side, the following configuration is preferable. That is, it is preferable that the outer surface of the wall surface portion other than the corner portion on the side wall of the container is a smooth surface, and a vertical groove as an easy-sliding portion is formed on the outer surface of at least one corner portion of the container side wall. By making the outer surface of the wall portion of the side wall of the container a smooth surface, the shrink label on the outer side is also smoothed, so that characters and figures printed on the shrink label can be clearly seen and a good appearance can be obtained. Then, by forming vertical grooves at the corners, the contact area with the shrink label is reduced at the corners, and the circumferential frictional resistance between the shrink labels is relatively less at the corners where the vertical grooves are provided. Small and relatively large at the wall surface.

  Moreover, when providing an easily-sliding part in the shrink label side, it is preferable to comprise as follows. That is, it is preferable to partially form a resin layer having excellent slipperiness as an easy-sliding portion on the inner surface of the shrink label and corresponding to at least one corner of the side wall of the container. By locally forming a resin layer having excellent slidability on the inner surface of the shrink label as the easy-sliding portion, it is possible to easily reduce the frictional resistance of the inner surface of the shrink label locally instead of overall. That is, the frictional resistance of the inner surface of the shrink label is not made uniform over the entire circumference, but can be reduced only at a location corresponding to at least one corner of the side wall of the container.

  The rectangular container according to the present invention is a rectangular container in which a shrink label is attached to a side wall having a square cross-sectional view, and the outer surface of at least one corner of the side wall is between the shrink label in the corner. An easy-sliding portion is formed to make the frictional resistance in the circumferential direction smaller than the frictional resistance in the wall surface portion other than the corner portion of the side wall.

  Further, the shrink label for a rectangular container according to the present invention is a shrink label for a rectangular container attached to a side wall of a container having a rectangular shape in a cross-sectional view, and has a location corresponding to at least one corner of the side wall of the container. The inner surface is formed with an easy-sliding portion for making the frictional resistance in the circumferential direction between the side wall of the container at the location smaller than the frictional resistance at the location corresponding to the wall portion other than the corner portion. And

  As described above, the shrink-labeled rectangular container according to the present invention can smoothly shrink the shrink label at the corner portion by the easy-sliding portion, so that shrinkage of the shrink label that easily occurs at the corner portion can be suppressed.

  Similarly, in the rectangular container and the shrink label for the rectangular container according to the present invention, the shrink label can be smoothly heat-shrinked in the corner portion by the easy-sliding portion, so that the shrinkage of the shrink label that is likely to occur in the corner portion is suppressed. be able to.

The perspective view which shows the square container with a shrink label in one Embodiment of this invention. The side view which shows the container currently used for the square container with the said shrink label. AA sectional drawing of FIG. The B section enlarged view of FIG. It is a figure which shows the principal part of the container used for the square container with a shrink label in other embodiment of this invention, Comprising: Sectional drawing corresponding to FIG. The principal part front view which shows the inner surface of the shrink label used for the square container with a shrink label in other embodiment of this invention.

  Hereinafter, a rectangular container with a shrink label according to an embodiment of the present invention will be described with reference to FIGS. The square container with a shrink label shown in FIG. 1 is obtained by mounting a shrink label 2 on a container 1 having a side wall 11 having a square cross-sectional view. In FIG. 2, the shrink label 2 is indicated by a two-dot chain line.

  The container 1 has a bottomed rectangular tube shape with an open top surface, and includes a bottom wall 10, a rectangular side wall 11 rising upward from the peripheral edge of the bottom wall 10, and an upper end of the side wall 11. And a flange 12 projecting outward. The bottom wall 10 has a rectangular shape in accordance with the rectangular side wall 11 in a cross-sectional view.

  The side wall 11 is formed to rise upward from the peripheral edge of the bottom wall 10, and is roughly divided into two regions, upper and lower. That is, the side wall 11 is a lower region of the side wall main portion 15 via the side wall main portion 15 rising from the bottom wall 10 and an upper region of the side wall main portion 15 via the stepped portion 16 extending outward from the side wall main portion 15. It consists of a side wall upper step 17 extending upward.

  The side wall main portion 15 occupies most of the region of the side wall 11 and is formed in a tapered shape that gradually spreads upward from the bottom wall 10. However, the inclination gradient of the side wall main portion 15 is about several degrees. The side wall main portion 15 includes four wall surface portions 20 and 21. That is, the side wall main portion 15 includes a pair of wall surfaces 20 on the long side and a pair of wall surfaces 21 on the short side. The pair of wall surfaces 21 on the short side is the surfaces that are the left and right sides of the container 1, and the pair of wall surfaces 20 on the long side are the surfaces that serve as the front and back surfaces of the container 1. As shown in FIG. 3, the pair of wall surfaces 21 on the short side is formed in a substantially flat shape, while the pair of wall surfaces 20 on the long side is formed in a shape bulging slightly toward the outside. Has been. The outer surfaces of these four wall surface portions 20 and 21 are smooth and smooth surfaces without any irregularities.

  There are a total of four corner portions 22 between the adjacent wall portions 20 and 21, that is, the corner portions 22 between the long-side wall portion 20 and the short-side wall portion 21, but any corner portion. 22 is also formed in an arc shape in cross section. Longitudinal grooves 23 are formed on the outer surfaces of the four corners 22. A plurality of (for example, eight) vertical grooves 23 are arranged in parallel with a certain interval in the circumferential direction (lateral direction). The vertical groove 23 is formed only in the side wall main portion 15 and is not formed in the side wall upper step portion 17. As described above, since the side wall main portion 15 has a tapered shape spreading upward, the interval between the vertical grooves 23 is slightly wider toward the upper side. The vertical groove 23 is formed over substantially the entire height of the side wall main portion 15, and its upper end reaches the vicinity of the step portion 16. The vertical groove 23 is V-shaped (that is, a V-groove) in a cross-sectional view as shown in FIG. The width of the vertical groove 23 is, for example, about 1 mm at the upper end, and the interval between the vertical grooves 23 is larger than the width of the vertical groove 23, for example, about 2-3 mm. Since the vertical groove 23 is formed on the outer surface of the corner portion 22 in this way, a vertical protrusion 24 is provided on the inner surface of the corner portion 22 so as to protrude inward corresponding to the vertical groove 23. That is, the protrusion 24 is formed on the inner surface of the corner portion 22 corresponding to the vertical groove 23, so that the thickness is not extremely reduced in the portion where the vertical groove 23 is formed. In the present embodiment, the vertical groove 23 forms an easy-sliding portion, and by forming the vertical groove 23, the circumferential frictional resistance between the shrink label 2 and the corner portion 22 of the side wall main portion 15 is reduced. Is relatively small, and is relatively large at the wall surface portions 20 and 21 of the side wall main portion 15.

  The side wall upper step portion 17 is expanded one step outward from the side wall main portion 15, and its vertical dimension is smaller than that of the side wall main portion 15 and has a strip shape. Has been. The side wall main portion 15 is tapered, while the side wall upper step portion 17 stands substantially upright, and the flange 12 is formed substantially horizontally at the upper end thereof over the entire circumference.

  The side wall upper step portion 17 also includes four wall surface portions 30 and 31. That is, the side wall upper step portion 17 includes a pair of wall surfaces 30 on the long side and a pair of wall surfaces 31 on the short side. The pair of wall surfaces 31 on the short side is positioned above the wall surface 21 on the short side of the side wall main portion 15 and constitutes the left and right side surfaces of the container 1 together with the wall surface 21 on the short side of the side wall main portion 15. The pair of wall portions 30 on the long side is located above the wall portion 20 on the long side of the side wall main portion 15 and the front and back surfaces of the container 1 together with the wall portion 20 on the long side of the side wall main portion 15. Is configured. In the side wall upper step portion 17, as in the side wall main portion 15, the pair of wall surfaces 31 on the short side is formed substantially flat, while the pair of wall surfaces 30 on the long side is slightly curved toward the outside. It is formed in a bulging shape. The outer surfaces of these four wall surface portions 30 and 31 are smooth and smooth surfaces with no irregularities. And there are a total of four corner portions 32 between the adjacent wall portions 30, 31, that is, the corner portions 32 between the long-side wall portion 30 and the short-side wall portion 31, whichever corner The portion 32 is also formed in an arc shape in cross section, but the vertical groove 23 is not formed in the corner portion 32 of the upper side wall step portion 17. That is, the outer surface of the side wall upper step portion 17 is a smooth smooth surface having no unevenness over the entire circumference. Thus, in this embodiment, the corner of the side wall 11 of the container 1 is composed of the corner 22 of the side wall main portion 15 and the corner 32 of the side wall upper step portion 17, and a vertical groove is formed in the corner 22 of the side wall main portion 15. 23 is formed.

  The container 1 configured as described above is formed from various synthetic resins by injection molding, but may be formed by blow molding or sheet molding.

  A cylindrical shrink label 2 is attached to the side wall 11 of the container 1. The shrink label 2 covers substantially the entire side wall 11, its lower end 2 b extends to the peripheral edge of the bottom wall 10, and its upper end 2 a reaches almost the upper end of the side wall upper step 17. That is, the upper end portion 2 a of the shrink label 2 is located substantially directly below the flange 12. The longitudinal groove 23 formed in the corner portion 22 of the side wall main portion 15 is entirely covered with the shrink label 2 and cannot be viewed from the outside of the shrink label 2. In addition, since the width of the vertical groove 23 is narrow, the shrink label 2 does not enter the vertical groove 23 due to thermal contraction and the vertical stripe corresponding to the vertical groove 23 is generated on the surface of the shrink label 2. The surface is also a smooth surface at the corner 22.

  The shrink label 2 has a display printing layer such as letters and designs laminated on the inner surface of the film substrate, a white printing layer laminated on the inner surface of the display printing layer, and the display printing layer is visually recognized through the film substrate. It has a configuration. As the film substrate, various known materials such as polyester resins and polystyrene resins can be used. The thermal shrinkage in the circumferential direction of the film substrate is preferably about 30% or more, particularly about 40% or more when immersed in warm water at 80 ° C. for 10 seconds. As described above, the side wall main portion 15 of the container 1 has a tapered shape spreading upward, and the side wall upper step portion 17 is one step larger than the side wall main portion 15, so that the shrinkage amount of the shrink label 2 is The side wall upper step portion 17 is the smallest, and the contraction amount in the side wall main portion 15 is larger than that in the side wall upper step portion 17 and becomes larger toward the lower side. Moreover, it is preferable to apply a delayed tack type adhesive to the upper predetermined region of the inner surface of the shrink label 2 by, for example, gravure printing. When the adhesive is activated by heat during shrinking, the shrink label 2 is adhered to the side wall upper step portion 17, thereby preventing the shrink label 2 from being displaced downward. The adhesive may be formed on the upper predetermined region of the inner surface of the shrink label 2 as desired. For example, instead of continuously forming the application part to which the adhesive is applied in the circumferential direction over the entire circumference, a predetermined amount is used. It is preferable to alternately form the length of the application portion and the non-application portion where the adhesive is not applied in the circumferential direction, thereby preventing blocking of the inner surfaces when the shrink label 2 is folded flat. it can. In addition, when the application part and the non-application part are alternately formed in the circumferential direction, two rows along the circumferential direction are formed in the upper and lower rows, and the application parts are arranged in a staggered manner in the upper row and the lower row. It is preferable to form as described above.

  As described above, a plurality of vertical grooves 23 are formed at each corner 22 in the side wall main portion 15 which is a region where the shrinkage amount of the shrink label 2 is relatively large in the side wall 11 of the container 1. When the thin shrink label 2 is placed on the side wall 11 to be heated and contracted, the shrink label 2 can smoothly move and contract in the circumferential direction at each corner portion 22 of the side wall main portion 15. Therefore, wrinkles that are likely to occur in the shrink label 2 at the corner portion 22 of the side wall main portion 15 can be prevented, and a good aesthetic appearance can be obtained. Even if the vertical groove 23 is formed in the corner portion 22 of the side wall main portion 15, the vertical groove 23 is covered with the shrink label 2 and is not visually recognized from the outside. Moreover, since the wall surface portions 20 and 21 of the side wall main portion 15 do not have the vertical grooves 23 and the wall surface portions 20 and 21 are smooth surfaces, the shrink label 2 positioned outside the wall surface portions 20 and 21 is also a smooth surface. Thus, a display function as a label can be sufficiently secured. In addition, since the shrinkage amount of the shrink label 2 is small in the side wall upper step portion 17, wrinkles are hardly generated even if the vertical groove 23 is not formed in the corner portion 32. In the side wall upper step portion 17 having a small shrinkage amount, an adhesive is applied to the inner surface of the shrink label 2 so that the shrink label 2 is securely attached without being displaced downward. In the side wall main portion 15 having a large amount, vertical grooves 23 are formed in the corner portions 22 to reduce the coefficient of friction in the circumferential direction during contraction to prevent wrinkles.

  Moreover, although the vertical groove 23 was formed in V shape in the said embodiment, as shown in FIG. 5, you may form the vertical groove 23 in cross-sectional view circular arc shape, and the shape is arbitrary. Further, the width, interval, length, and number of the longitudinal grooves 23 are also arbitrary, and may be formed not in a straight line but in a jagged or curved shape.

  Further, instead of the vertical groove 23, a vertical protrusion may be formed on the outer surface of the corner portion 22 of the side wall main portion 15. Furthermore, you may form a ditch | groove and a protrusion in the diagonal direction and the circumferential direction. Furthermore, a large number of convex portions and concave portions may be formed only on the outer surface of the corner portion 22 of the side wall main portion 15 instead of the linear shape. In any case, by forming an uneven shape on the outer surface of the corner portion 22 of the side wall main portion 15, the contact area with the shrink label 2 becomes smaller than in the case of a smooth surface. The frictional resistance with the shrink label 2 can be made relatively smaller than the wall surface portions 20 and 21 of the side wall main portion 15, and even in a region where the shrinkage amount is relatively large, Occurrence of wrinkles can be easily prevented. In addition, the outer surface of the corner 22 of the side wall main portion 15 is formed with an uneven shape on the outer surface of the corner portion 22 of the side wall main portion 15, and the coating for reducing the frictional resistance with the shrink label 2 is an easy sliding portion. You may form only.

  In the present embodiment, the side wall 11 is composed of two regions of the side wall main portion 15 and the side wall upper step portion 17. However, the side wall 11 may be configured to have a tapered shape up to the upper end portion without the side wall upper step portion 17. . In that case, the vertical groove 23 may be formed up to the upper end portion of the side wall 11, or may be formed only at a part of the total height of the side wall 11.

  Further, in addition to forming the easy sliding portion on the container 1 side as described above, the easy sliding portion may be formed on the shrink label 2 side. For example, as shown in FIG. 6, a total of four ink layers 40 are formed on the inner surface of the shrink label 2 at intervals in the circumferential direction as a resin layer having excellent slipperiness. The ink layer 40 is part-coated by gravure printing, for example, on the inner side of the above-described white print layer. The ink layer 40 is preferably transparent, and can be a medium ink layer containing no pigment, for example. This medium ink is substantially free of pigment, for example, an aqueous resin such as an emulsion in which an acrylic resin, an acrylic copolymer, a polyester resin, a urethane resin, an aqueous polyamide resin, etc. are dispersed in water or water and alcohol. Rosin, ketone resin, vinyl chloride resin, vinyl chloride-vinyl acetate copolymer, acrylic resin, urethane resin, acrylic-urethane copolymer, polyester resin, and other solvents such as toluene, methyl ethyl ketone, ethyl acetate, isopropyl alcohol The solvent type thing etc. which dissolved etc. are mentioned. In particular, an acrylic resin, a medium ink mainly composed of an acrylic resin and a nitrocellulose resin are preferable. In order to improve slipperiness, it is also preferable to add fine particles such as waxes, silicone, silica, and various lubricants. In addition, various additives, such as a thickener, an antifoamer, a fungicide, and a water-solubilizing agent, can be mixed as needed. As described above, an adhesive may be applied to the upper predetermined region of the inner surface of the shrink label 2. In that case, the adhesive may be applied so as not to overlap the ink layer 40 or may be applied so as to overlap the upper region of the ink layer 40 from above.

  Thus, an easy sliding part may be provided in the shrink label 2 side, and an easy sliding part may be provided in both the container 1 and the shrink label 2.

  Moreover, it is not necessary to provide an easy sliding part in all the corner | angular parts 22 of the side wall main part 15, for example, it provides only in the two corners 22 on a diagonal, or two corners 22 of one long side. Or may be provided only in one place. The same applies when an easy-sliding portion is provided on the shrink label 2 side. Further, the easy sliding portion such as the vertical groove 23 may not be formed over the entire height of the corner portion 22 of the side wall main portion 15, for example, the vertical groove 23 or the like only in the lower region of the corner portion 22 of the side wall main portion 15. May be provided over the entire height of the side wall 11 including the upper side step portion 17 of the side wall, and provided that it is formed on at least a part of the total height of the corner portion of the side wall 11. Good. However, it is preferable to provide the easy-sliding portion at a location where the amount of contraction is relatively large in the overall height of the corner portion of the side wall 11.

  In addition, although the thing of the cross-sectional view rectangle was illustrated as the container 1, the cross-sectional view square thing may be sufficient, and it cannot be overemphasized that other square shape may be sufficient. Moreover, although demonstrated as the container 1 with the flange 12, the trunk | drum (side wall) may be a PET bottle with a cross-sectional view square shape.

DESCRIPTION OF SYMBOLS 1 Container 2 Shrink label 2a Upper end part 2b Lower end part 10 Bottom wall 11 Side wall 12 Flange 15 Side wall main part 16 Step part 17 Side wall upper step part 20 Wall surface part 21 Wall surface part 22 Corner part 23 Vertical groove (easy sliding part)
24 ridge 30 wall surface portion 31 wall surface portion 32 corner portion 40 ink layer (resin layer, easy sliding portion)

Claims (5)

A rectangular container with a shrink label in which a shrink label is attached to a side wall of a container having a square shape in cross section,
At least one of the outer surface of the side wall and the inner surface of the shrink label at at least one corner of the side wall of the container has side frictional resistance between the shrink label and the side wall of the container at the corner of the side wall of the container. A rectangular container with a shrink label, wherein an easily sliding portion for reducing the frictional resistance in the wall surface portion other than the corner portion is formed.   The shrink label according to claim 1, wherein the outer surface of the wall surface portion other than the corner portion on the side wall of the container is a smooth surface, and a longitudinal groove as an easy-sliding portion is formed on the outer surface of at least one corner portion of the side wall of the container. A square container.   The resin layer excellent in the slidability as an easily-sliding part is partially formed in the location corresponding to at least one corner of the side wall of the container on the inner surface of the shrink label. Square container with shrink label. A square container in which a shrink label is attached to a side wall having a square shape in cross section,
An easy-sliding portion is formed on the outer surface of at least one corner portion of the side wall so that the frictional resistance in the circumferential direction between the corner portion and the shrink label is smaller than the frictional resistance in the wall surface portion other than the corner portion of the side wall. A rectangular container characterized by being made. A shrink label for a rectangular container to be attached to a side wall of a rectangular container having a cross-sectional view,
On the inner surface of the portion corresponding to at least one corner of the side wall of the container, the frictional resistance in the circumferential direction between the portion and the side wall of the container is smaller than the friction resistance in the portion corresponding to the wall portion other than the corner. A shrink label for a rectangular container, characterized in that an easy-sliding portion is formed.

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