Method for manufacturing a shrink-labeled container, shrink-labeled container, and shrink label

Abstract

We provide shrink labels that can be opened cleanly by removing the top of the cap seal. [Solution] A method for manufacturing shrink labels includes: a diagonal perforation line forming step of forming multiple diagonal perforations at predetermined intervals in the longitudinal direction on a long sleeve-shaped shrink label folded along a first fold line extending in the longitudinal direction; a fold position changing step of changing the fold position after the diagonal perforation line forming step so that the long sleeve-shaped shrink label is folded along a second fold line extending in the longitudinal direction at a circumferential position different from the first fold line; a horizontal perforation line forming step of forming multiple horizontal perforations at predetermined intervals in the longitudinal direction on a long sleeve-shaped shrink label folded along the second fold line; and a cutting step of cutting the long sleeve-shaped shrink label folded along the second fold line into individual sheets and forming a tab.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a container with a shrink label, a container with a shrink label, and a shrink label.

Background Art

[0002] It is widely practiced to attach a heat-shrinkable label to an adherend such as a container containing seasonings, cosmetics, pharmaceuticals, foods, beverages, toiletries, machine parts, etc. For example, a heat-shrinkable label is attached to a container with a cap, such as an eye drop container, to seal and protect it. As such a heat-shrinkable label (also called a cap seal) used for such purposes, shrink labels, shrink tack labels, etc. are known.

[0003] In the case of a shrink label, after fitting a shrink label, which is a cylindrical body formed by shaping a sheet-like heat-shrinkable film into a cylindrical shape, onto a container, the shrink label is heat-shrunk in the circumferential direction to seal the cap portion of the container and the like.

[0004] On the other hand, in the case of a shrink tack label, a shrink tack label, which is a sheet-like heat-shrinkable film having an adhesive layer or the like in part, is attached to and wound around a container with an adhesive or the like at one circumferential end (side end), and then the back surface of the other side end is adhered to the surface of the one side end, whereby it is attached to the container (see, for example, FIG. 5 of Patent Document 1). Further, by heat-shrinking the shrink tack label attached to the container in the circumferential direction, the cap portion of the container and the like can be sealed.

[0005] Also, it is known to open a heat-shrinkable label (cap seal) by removing a cap portion (upper part) covering the outer circumference of a cap while leaving a main body part (lower part) with a product display or the like covering the container body in the heat-shrinkable label attached to a container with a cap (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Patent No. 6360710 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Patent Document 1 describes a heat-shrinkable label in which a horizontal perforation line extending horizontally (circumferentially to the container) and a diagonal perforation line connected to the horizontal perforation line and extending diagonally to the horizontal end of the tab on the upper edge of the cap seal are formed at the boundary between the main body and the cap portion. This allows the cap seal to be neatly opened by pinching the tab on the upper edge of the cap seal with your fingers, cutting along the diagonal perforation line in the axial direction up to the horizontal perforation line, and then continuing to cut along the horizontal perforation line.

[0008] Here, heat-shrinkable labels (shrink tack labels and shrink labels) tend to tear in the circumferential direction (the direction of heat shrinkage). If the slope of the diagonal perforation line 4 is large near the upper end 4a of the diagonal perforation line 4, which is the starting point for cutting, the label will tend to tear diagonally along the perforation line rather than vertically. This can easily induce lateral tearing of the shrink label, potentially making it impossible to cut off the cap portion 40 of the shrink label 2 so that it reaches the horizontal perforation line 3.

[0009] In shrink tack labels, perforations are typically formed on a continuous label stacked on a release liner using a Pinnacle® blade or the like, and then die-cut into the label shape to create a continuous label stack in which multiple labels can be peeled off the release liner. In this case, since perforations can be formed on a sheet-like continuous label stack, diagonal perforations can be made to extend over the length of the label by gradually changing the slope from the vertical direction to a gentle slope (see Figure 5 of Patent Document 1).

[0010] On the other hand, since the shrink label is fitted onto the container as a tubular body, when forming similar perforations, the label continuous body (long sleeve-shaped shrink label 2B), which is formed by molding a long strip-shaped base film into a tubular shape, is protected by an inner guide 24 to prevent perforations from being formed on the opposite side, and perforations (diagonal perforations 4) are formed by intermittently irradiating one side with a laser, so that the perforations are formed only on one side of the tubular body (a range of less than half the surface of the tube) (see Figure 6(a)). The inner guide is, for example, a metal plate placed inside the long sleeve-shaped shrink label 2B. After that, the long sleeve-shaped shrink label is cut, and the tubular shrink label is fitted onto the container.

[0011] Thus, when forming perforations on a long, sleeve-shaped shrink label, if the cutting process is carried out so that the tab 5 is located in the center of the width direction of the long, sleeve-shaped shrink label, as shown in Figure 9(a), then an unnecessary tab 5 (and its corresponding notch 51) is formed on the back side where there are no perforations, which is undesirable. Furthermore, as shown in Figure 9(b), if the cutting process is carried out so that the tab portion 5 is provided at one end in the width direction of the long sleeve-shaped shrink label, one tab portion 5 is formed. Although it is possible to create one tab portion 5 by carrying out the cutting process so that the tab portion 5 is provided at such a folding position, it was difficult to provide a diagonal perforation line 4 that starts from the lateral end of this tab portion 5, extends diagonally downward, and connects to the horizontal perforation line 3. Furthermore, as shown in Figure 9(c), if the width of the tab 5 is increased in Figure 9(b), the diagonal perforation line 4 can be made to slope more gently. However, the tab 5 (and the corresponding notch 51) becomes larger, a larger portion of the container is exposed, and the tab becomes less noticeable.

[0012] However, shrink tack labels require an adhesive layer and release paper, resulting in high material costs. There was a need to replace them with shrink labels that do not require the disposal of release paper.

[0013] The object of the present invention is to provide a shrink label (cap seal) that can be neatly opened by pinching the tab at the upper edge of the shrink label with your fingers, cutting axially along the diagonal perforations up to the horizontal perforations, and then continuing to cut along the horizontal perforations to remove the top of the shrink label. [Means for solving the problem]

[0014] The present invention provides a method for manufacturing a shrink-labeled container, which involves heat-shrinking a cylindrical shrink label, whose primary shrinkage direction is circumferential, onto a container. The aforementioned shrink label is A gripping portion provided on a part of the upper edge, The horizontal stitching lines extend in the circumferential direction, A diagonal stitch line extending from the upper edge to the horizontal stitch line, The gripping portion comprises a fold line that passes through the circumferential center and extends axially. The diagonal stitching line is provided at an inclination with respect to the axial direction, extending circumferentially from approximately one end of the gripping portion on the upper edge toward the horizontal stitching line, and crossing the fold line. The aforementioned manufacturing method is A diagonal perforation line forming step, in which a plurality of diagonal perforations are formed at predetermined intervals in the longitudinal direction on a long sleeve-shaped shrink label folded along a first fold line extending in the longitudinal direction, After the diagonal perforation line formation step, the folding position is changed such that the elongated sleeve-shaped shrink label is folded along a second fold line that extends longitudinally at a circumferential position different from the first fold line. A horizontal perforation line forming step, in which a plurality of horizontal perforations are formed at predetermined intervals in the longitudinal direction on the long sleeve-shaped shrink label that has been folded along the second fold line, A cutting step is to cut the long, sleeve-shaped shrink label, which has been folded along the second fold line, into individual sheets to form the tab portion, comprises.

Advantages of the Invention

[0015] According to the present invention, by pinching the gripping portion at the upper end edge of the shrink label (cap seal) with a finger, cutting axially along the diagonal perforation line until reaching the horizontal perforation line, and then further cutting along the horizontal perforation line, it is possible to provide a shrink label that can remove the upper part of the shrink label and be neatly opened.

Brief Description of the Drawings

[0016] [Figure 1] It is a perspective view showing a container with a shrink label according to an embodiment. [Figure 2] It is a perspective schematic view from directly above the front of an open state immediately before fitting the shrink label according to an embodiment to the container. [Figure 3] It is a front schematic view (planar schematic view) showing a shrink label according to an embodiment. [Figure 4] It is a front schematic view showing a shrink label. [Figure 5] It is a schematic view for explaining a method of manufacturing a shrink label according to an embodiment. [Figure 6] It is another schematic view for explaining a method of manufacturing a shrink label according to an embodiment. [Figure 7] It is a schematic view showing a center seal step in a method of manufacturing a shrink label according to an embodiment. Note that FIG. 7(b) is a view of the cross section of FIG. 7(a) seen from the upstream side (original roll side) in the length direction of the base material film 2A. [Figure 8] It is a schematic view showing a folding position changing step in a method of manufacturing a shrink label according to an embodiment. [Figure 9] It is a schematic view for explaining problems in the manufacture of a conventional shrink label. [Figure 10] It is a front schematic view (planar schematic view) showing a modified example of a shrink label according to an embodiment. [Figure 11]This is a schematic front view (schematic plan view) showing another modified example of the shrink label of the embodiment. [Figure 12] (a) is a schematic front view (plan view) showing yet another modification of the shrink label of the embodiment. (b) is a magnified view of a portion of the diagonal perforation line 4 shown in (a). [Modes for carrying out the invention]

[0017] Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or common parts are denoted by the same reference numerals.

[0018] In this specification, unless otherwise specified, “inside” means the inner surface of a cylindrical body that is open so that the shrink label can be fitted onto an adherend, and “outside” means the outer surface of the cylindrical body. Also, “front surface” means the outer surface, and “back surface” means the inner surface.

[0019] In this specification, "axial direction" (X) means the direction connecting the center of one opening and the center of the other opening in the cylindrical body. "Circumferential direction" means the direction along the outer circumference (or inner circumference) of the cylindrical body on a virtual plane perpendicular to the axial direction. Furthermore, the upper surface of the adherend (container) refers to the surface that faces upward in the normal manner of use, and the lower surface refers to the surface that faces downward in the normal manner of use; however, in the configuration of the present invention, it is not necessary for the two to be clearly distinguishable. The outer circumferential surface of the container is the surface to which the shrink label is mainly attached, and at least a part of it extends along the axial direction.

[0020] In describing the embodiments, terms indicating directions such as up and down are used for convenience of explanation, but the relationship between the components of the present invention and such directions is not limited. Such terms indicating directions refer, for example, to the orientation in the installed state, such as when a shrink-labeled container is normally displayed or used.

[0021] With respect to shrink label 2, the reference numerals in this specification and the drawings are as follows: 2A: Long strip-shaped base film used in the production of shrink labels 2B: A long, sleeve-shaped shrink label formed by bonding the base film 2A at the center seal. 2C: Long sleeve-shaped shrink label after changing the folding position 2D: Shrink Label

[0022] <Container with shrink-wrapped label> In this embodiment, a shrink label is a tubular label that shrinks in diameter when heated to a predetermined temperature or higher and can be attached to an object such as a container. A tubular label is any label that can form a tubular body that can be fitted onto an object, and this includes sleeve-shaped labels in which the tubular body is folded flat along two opposing fold lines extending in the axial direction X. Unlike shrink tack labels that are wrapped around and attached to containers, the shrink labels used in this embodiment do not require an adhesive layer or release paper. Therefore, materials are reduced, waste is minimized, and they can be manufactured at a low cost.

[0023] The container (subject to be covered) is, for example, cylindrical and has an outer surface, a top surface, a bottom surface, etc. The shrink label covers, for example, at least the outer surface of the container, and further covers the peripheral edges of the top and bottom surfaces. The container may be, for example, a container with a cap 8 consisting of a container body 81 which is the storage part for the contents, and a cap 82 which is attached to the container body 81 so as to be openable and closable by screwing or the like (see Figure 1). The contents are not particularly limited, but examples include seasonings, cosmetics, pharmaceuticals, food, beverages, toiletries, and machine parts. The shrink label can be used, for example, as a label that also serves as a cap seal to seal the cap 82 of a capped container 8.

[0024] Referring to Figures 2 and 3, the shrink label 2 is A gripping portion 5 is provided on a part of the upper edge 2x, A horizontal stitch line 3 extending in the circumferential direction, A diagonal stitch line 4 extends from the top edge 2x to the horizontal stitch line 3, The gripping portion 5 is provided with a fold line (second fold line 202) that passes through the circumferential center and extends axially. The fold line (second fold line 202) extends from the upper edge 2x to the lower edge 2y of the shrink label 2.

[0025] Here, the diagonal perforation line 4 is provided at an angle with respect to the axial direction X, extending circumferentially from approximately the end position (circumferentially) of one of the gripping portions 5 on the upper edge 2x toward the horizontal perforation line 3, and crossing the fold line (second fold line 202). The approximately end position is a position within a predetermined range in the circumferential direction that includes the end, and for example, it is sufficient if the diagonal perforation line 4 provided at that position can be torn from the upper end side when the gripping portion 5 is pulled away approximately downwards.

[0026] Shrink labels (heat-shrinkable labels) tend to tear in the circumferential direction (direction of heat shrinkage). If the inclination of the diagonal perforation line 4 is large near the upper end 4a of the diagonal perforation line 4, which is the starting point for cutting, the label will tend to tear diagonally along the perforation line rather than vertically. This can easily induce lateral tearing of the shrink label, potentially making it impossible to cut off the cap portion 40 of the shrink label 2 to reach the horizontal perforation line 3. In contrast, in this embodiment, by providing the diagonal perforation line 4 so as to straddle the fold line (second fold line 202), in a plan view (see Figure 3(a)), the inclination angle β with respect to the axial direction X from the upper end 4a of the diagonal perforation line 4 to a predetermined position 4c in the middle is reduced, and the inclination angle γ with respect to the axial direction X from the predetermined position 4c in the middle of the diagonal perforation line 4 to the lower end 4b is increased, allowing the section from the predetermined position 4c to the lower end 4b to be sufficiently long. This allows the tab 5 to be peeled off in a nearly downward direction, guiding the cap portion 40 of the shrink label 2 to be torn in a direction close to the vertical direction. This suppresses lateral tearing when cutting the label along the diagonal perforation line 4. Furthermore, by further peeling the tab 5 diagonally downward from the perforation line, lateral tearing is suppressed, and the cap portion 40 can be torn along the diagonal perforation line 4 to continue along the horizontal perforation line 3. Subsequently, the boundary between the cap portion 40 and the main body portion 30 can be torn along the horizontal perforation line 3. As a result, the cap portion 40 of the shrink label 2 can be cut off smoothly and cleanly.

[0027] The primary shrinkage direction of shrink label 2 is the circumferential direction in the tubular body described above. For example, after fitting the shrink label 2 onto the substrate, the shrink label 2 can be attached to the substrate by blowing hot air heated to a predetermined heat shrink temperature (for example, around 100°C to 180°C) onto it, thereby heating the shrink label 2 to around 65°C to 100°C.

[0028] The shrink label 2 covers at least the outer surface and the peripheral edge (the edge and the portion adjacent to the edge) of the top surface of the container. For example, when a shrink label 2 is used to seal and protect a capped container 8, such as an eye drop container, the shrink label 2 is attached to the capped container 8 such that the main body portion 30 (lower part) of the shrink label 2 covers the outer surface of the container body 81, and the cap portion 40 (upper part) of the shrink label 2 covers the outer surface of the cap 82 attached to the container body 81 (see Figure 1). This allows the cap 82 of an unused capped container 8 to be sealed, and after the cap portion 40 (upper part) of the shrink label 2 is cut axially along the diagonal perforation line 4, it is then cut along the horizontal perforation line 3 to remove the cap portion 40, allowing the cap 82 to be opened and closed, while the main body portion 30, which has a display function, remains attached to the container body 81. The cap portion 40 is the part of the shrink label 2 above the horizontal perforation line 3, and the main body portion 30 is the part of the shrink label 2 below the horizontal perforation line 3.

[0029] The shrink-labeled container of this embodiment is formed by heat-shrinking and attaching the above-mentioned shrink label to the container (so that its circumferential direction is the circumferential direction of the container). The shrink label on the container with the shrink label, after heat shrinking, has the same features as the shrink label described above, including a tab, horizontal perforations, diagonal perforations, and fold lines. The fold lines are the traces of the folds at the positions where the cylindrical body was folded flat before being attached to the container, and even on the heat-shrinked shrink label 2 attached to the object, the fold lines (first fold line 201, second fold line 202) are usually slightly visible.

[0030] (Pinch part) In this embodiment, the shrink label 2 (shrink label 2D) has a tab 5 on a part of its upper edge 2x (see Figures 1 to 4). The upper edge 2x is the edge on one side of the shrink label 2 (2D) in the axial direction X (the side that will be above the container to which it will be attached).

[0031] The shape of the gripping portion 5 is not particularly limited and may be a trapezoidal shape as shown in the illustration, or it may be a square shape, a semicircular shape, or the like. If the gripping portion 5 has a shape with corners such as a square or trapezoid, those corners may be formed in a rounded R shape.

[0032] (From the perspective of the horizontal stitching) In this embodiment, the shrink label 2 is provided with horizontal perforations 3 for removing the cap portion 40 (upper part) of the shrink label 2 that covers the outer surface of the cap portion of the container. The horizontal perforation line 3 is a perforation line that extends in the circumferential direction. It is preferable that the horizontal perforation line 3 is provided along the entire circumference of the shrink label 2 in the circumferential direction in order to cleanly remove the cap portion 40.

[0033] (From the perspective of the diagonal stitching) The shrink label 2 has a diagonal stitch line 4 that extends from the top edge 2x to the horizontal stitch line 3.

[0034] As described in the manufacturing method of the shrink-labeled container below, the individual shrink label 2D after the cutting process is folded along the second fold line 202 as shown in Figure 5(c). However, for convenience, in order to explain the characteristics of the diagonal perforation line 4, Figure 3 shows the shrink label 2 folded along the first fold line 201. In the shrink-labeled container of this embodiment, the position of such fold lines is not particularly limited and may be any. Figure 4 shows the shrink label 2D of Figure 5(c) in an unfolded state. Figure 2 shows the shrink label 2 of Figure 3(a) in an unfolded state.

[0035] Preferably, the angle of inclination of the diagonal perforation line 4 with respect to the axial direction X gradually increases from the upper end 4a to the lower end 4b. For example, referring to Figure 3(a), in a plan view, it is preferable that the inclination angle β with respect to the axial direction X from the upper end 4a of the diagonal perforation line 4 to a predetermined position 4c in the middle is less than 45°, and the inclination angle γ with respect to the axial direction X from the predetermined position 4c in the middle of the diagonal perforation line 4 to the lower end 4b is greater than 45°. Here, "plan view" refers to a plan view of the shrink label 2 in a flat state, such as the sheet-fed sleeve-shaped shrink label 2 shown in Figure 3(a), where the portion of the shrink label 2 with the diagonal perforations 4 is laid flat.

[0036] In this way, by sufficiently inclining the portion of the diagonal perforation line 4 that connects to the horizontal perforation line 3 (from a predetermined position 4c in the middle of the diagonal perforation line 4 to the lower end 4b) with respect to the axial direction X, the label can be cut along the diagonal perforation line 4 and then neatly cut along the horizontal perforation line 3.

[0037] In particular, the inclination angle with respect to the axial direction X at the upper end 4a of the diagonal stitch line 4 is preferably 30° or less, especially preferably 15° or less, and as shown in Figure 3(b), it is preferable that the inclination angle with respect to the axial direction X at the upper end 4a of the diagonal stitch line 4 is approximately 0°. Furthermore, as shown in Figure 3(b), it is preferable that the range from the upper end 4a of the diagonal perforation line 4 to the predetermined position 4d is a straight line extending approximately in the axial direction X. If the inclination of the diagonal perforation line 4 is large near the upper end 4a of the diagonal perforation line 4, which serves as the starting point for cutting, the shrink label will tend to tear diagonally along the perforation line rather than vertically, which can easily induce lateral tearing of the shrink label and may prevent the cap portion 40 of the shrink label 2 from being cut to reach the horizontal perforation line 3. Therefore, by reducing the inclination of the diagonal perforation line 4 near the upper end 4a (preferably making it approximately a straight line along the axial direction X), lateral tearing at the starting point of cutting can be suppressed. However, if the distance from the upper end 4a to the predetermined position 4d becomes too long, the tear during cutting may not connect to the inclined portion, and if force is applied laterally from the middle, lateral tearing may occur. Therefore, it is preferable that the distance from the upper end 4a to the predetermined position 4d is approximately 5-30% of the distance from the upper end 4a to the lower end 4b, and that its length is in the range of 3mm to 10mm. Furthermore, in the case of a perforation line 4 consisting of a curve as shown in Figure 3(a), for the same reason, it is preferable that the inclination angle of the perforation line 4 with respect to the axial direction X is 30° or less in the range from the upper end 4a to 30% of the distance from the upper end 4a to the lower end 4b.

[0038] Furthermore, by making the angle of inclination with respect to the axial direction X sufficiently large from predetermined positions 4c and 4d along the diagonal perforation line 4 to the lower end 4b, the cap portion 40 can be smoothly cut along the diagonal perforation line 4 all the way to the end. In this way, by sufficiently tilting the portion of the diagonal perforation line 4 that connects to the horizontal perforation line 3 with respect to the axial direction X, the label can be cut along the diagonal perforation line 4, and then the label can be neatly cut along the horizontal perforation line 3.

[0039] In the range from predetermined positions 4c and 4d along the diagonal perforation line 4 to the lower end 4b, it is preferable that the shape of the diagonal perforation line 4 is a curved shape in which the angle of inclination with respect to the axial direction X gradually increases downwards. In this case, the cap portion 40 can be cut more smoothly along the diagonal perforation line 4.

[0040] It is preferable that the diagonal perforation line 4 is provided so as not to intersect with the center seal portion 25. This is because if the diagonal perforation line 4 intersects with the center seal portion 25, the operation of cutting the label along the diagonal perforation line 4 may be hindered at the intersection, potentially preventing a smooth cutting operation.

[0041] In addition, there is a commonly used perforation method for cap seals in which, instead of the diagonal perforation line 4, two perforations are provided circumferentially spaced apart, extending vertically from the upper edge 2x of the shrink label 2 (cap portion 40) to the horizontal perforation line 3. After cutting the film between the two perforations from the upper edge 2x, the cap portion 40 (upper part) of the shrink label 2 is cut along the horizontal perforation line 3. However, in this case, two steps are required, and the cap portion 40 of the shrink label 2 is divided into two parts. In contrast, with the shrink label of this embodiment, by providing the diagonal perforation line 4, it can be opened efficiently in one step, and since the cap portion 40 of the shrink label is not divided, disposal can also be carried out comfortably.

[0042] In this specification, the term "perforation line" refers to a detachable linear portion that includes multiple intermittent cuts. The perforation line includes at least one break line. A break line is a continuous linear portion consisting of multiple cuts 4X arranged along the direction of cutting and a break 4Y between the multiple cuts 4X when a portion of the shrink label 2 is cut along the perforation line (see Figure 12(b)).

[0043] Each of the multiple cuts may extend along the break line (the direction of cutting) (see Figures 1-6, 9), or it may extend in a direction different from the break line (see Figure 12). In Figure 12, below the predetermined position 4d of the diagonal perforation line 4, each cut 4X extends in a direction different from the break line (the direction in which it is cut). Specifically, at the upper end, it extends axially, and as it goes downwards, it extends in a direction that is inclined circumferentially, smoothly connecting to the cut of the horizontal perforation line 3. As a result, the shrink label 2 can be cut along the diagonal perforation line 4, and then the cap portion 40 of the shrink label 2 can be smoothly cut along the horizontal perforation line 3. Multiple cuts 4X in various directions, as shown in Figure 12, can be formed by laser processing or the like.

[0044] In the fracture line, adjacent cuts 4X in the circumferential direction may have overlapping portions in the axial direction (see Figure 12). In this case, the shrink label 2 is prone to lateral cuts in the circumferential direction, but even if a lateral cut occurs and the cutting direction shifts from the direction of the fracture line toward the circumferential direction, the cutting direction is corrected by adjacent cuts 4X in the circumferential direction, making it possible to cut along the fracture line.

[0045] In the fracture line, the axial length B (see Figure 12(b)) of the overlapping portion in the axial direction of adjacent circumferential cuts 4X is not particularly limited, but is, for example, 0.2 to 0.5 mm. The length of the cuts 4X is, for example, 0.7 to 1.5 mm. The circumferential spacing A (see Figure 12(b)) of the cuts 4X is, for example, 0.7 to 2.0 mm.

[0046] The perforation line may include multiple break lines 41, 42, 43 in at least part of it (see Figures 10 to 12).

[0047] As shown in Figures 10 to 12, multiple break lines 41, 42, and 43 may be provided at intervals in the circumferential direction within the range from at least the upper end 4a of the diagonal perforation line 4 to a predetermined position 4d.

[0048] In this case, even if the position of the upper end 4a of the diagonal perforation line 4 is shifted circumferentially relative to the tab 5 due to cutting of the tab 5, processing of the diagonal perforation line 4, or positional misalignment in the folding position change process described later, the shrink label 2 will be cut along one of the multiple break lines 41, 42, or 43 in the range from the upper end 4a to the predetermined position 4d, thus enabling more reliable cutting of the shrink label 2. As a result, the shrink label 2 will continue to be cut along the diagonal perforation line 4 in the range below the predetermined position 4d, and furthermore, the cap portion 40 of the shrink label 2 can be cut along the horizontal perforation line 3.

[0049] The length of the vertical range in which the multiple break lines 41, 42, and 43 are provided, that is, the range from the upper end 4a to the predetermined position 4d, is not particularly limited, and it is sufficient that the multiple break lines 41, 42, and 43 are provided in a range that includes at least the upper end 4a.

[0050] The circumferential spacing between the multiple fracture lines 41, 42, and 43 is not particularly limited, but is, for example, about 0.7 to 2.0 mm.

[0051] Of the multiple break lines 41, 42, and 43 described above, it is preferable that the lower ends 42a and 43a of the break lines 42 and 43 that are shifted circumferentially with respect to the upper end of the diagonal perforation line 4 below the predetermined position 4d are inclined to approach the upper end of the diagonal perforation line 4 below the predetermined position 4d (see Figure 10). This ensures that even when the shrink label 2 is cut along the break lines 42 and 43 in the range from the upper end 4a to the predetermined position 4d, the cutting direction is guided so that the shrink label 2 is subsequently cut along the diagonal perforation line 4 in the range below the predetermined position 4d.

[0052] As shown in Figure 10, for example, the lower end of break line 41, which is located in the circumferential center of the three break lines 41, 42, and 43, may be designed to be located at approximately the same circumferential position as the upper end of the diagonal perforation line 4 below the predetermined position 4d. Alternatively, as shown in Figure 11, for example, the lower end of break line 43, which is located furthest from the circumferential gripping portion 5 of the three break lines 41, 42, and 43, may be designed to be located at approximately the same circumferential position as the upper end of the diagonal perforation line 4 below the predetermined position 4d. As shown in Figure 11, the arrangement of the three break lines 41, 42, and 43 ensures that even if the position of the gripping portion 5 shifts circumferentially, if any of the three break lines 41, 42, or 43 is cut axially (downward in the drawing), the break will progress to the diagonal perforation line 4 below the predetermined position 4d, and the shrink label 2 can then be cut along the diagonal perforation line 4. Furthermore, the lower ends of the break lines 41 and 42, which are positioned offset from the upper end of the diagonal perforation line 4 below the predetermined position 4d toward the circumferential gripping portion 5, are separated vertically from the diagonal perforation line 4 below the predetermined position 4d. However, when the break lines 41 and 42 are torn in the axial direction (downward in the drawing), the break of the shrink label 2 progresses downward from the lower ends of the break lines 41 and 42, and the break reaches the diagonal perforation line 4 below the predetermined position 4d, allowing the shrink label 2 to be cut along the diagonal perforation line 4.

[0053] Although not shown in the diagram, for example, the diagonal perforation line 4 may include multiple break lines in at least a portion of the area other than the range from the upper end 4a to the predetermined position 4d, and the entire diagonal perforation line 4 may include multiple break lines.

[0054] As shown in Figures 11 and 12, a notch 44a may be provided on the upper edge 2x of the shrink label 2, extending downward from the end of the tab 5 that is closer to the upper end 4a of the diagonal perforation line 4, to serve as a starting point for tearing off the shrink label 2 by pulling the tab 5 downwards. If this notch 44a is provided, for example, at the same time as cutting the tab 5, the position of the notch 44a will not shift from the end of the tab 5, and therefore it can reliably function as a starting point for tearing off the shrink label 2 by pulling the tab 5 downwards.

[0055] As will be described later, when the cutting process is performed by cutting a long, sleeve-shaped shrink label 2C folded along the second fold line 202 into individual sheets, when attempting to form a notch 44a, a notch 44b extending downward from the end furthest from the upper end 4a of the diagonal perforation line 4 is also formed, resulting in notches 44a and 44b being formed at both ends of the gripping portion 5. Here, if the shrink label 2 is cut off starting from the notch 44b when the gripping portion 5 is pulled off in a roughly downward direction, it will be impossible to cut along the diagonal perforation line 4 properly. For this reason, a notch 44c extending in a different direction from the notch 44b is provided below the notch 44b as a stopper to prevent cutting starting from the notch 44b. Preferably, the notch 44c has at least a portion extending in a direction perpendicular to the notch 44b, and may be in the shape of an arc as shown in Figures 11 and 12. The notch 44c may be formed, for example, when a diagonal perforation line 4 is created by irradiating it with a laser.

[0056] (Base film: Heat-shrinkable film) The shrink label 2 is mainly composed of a base film. The shrink label 2(2D) is manufactured, for example, by joining the back surface of the first end 21 (one end in the width direction) and the front surface of the second end 22 (the other end in the width direction) of a long strip of base film 2A at a center seal portion 25 (center seal) (see Figure 7).

[0057] Examples of heat-shrinkable films used in the base film of this embodiment include single-layer films made of polyester resins, polystyrene resins, polyolefin resins, or mixed resins thereof, and multi-layer films made by laminating two or more layers of these resins.

[0058] Suitable heat-shrinkable films include, for example, single-layer or multi-layer films of polyester resin, and laminated films (hybrid type films) made by laminating a layer (at least one layer) of polyester resin and a layer (at least one layer) of polystyrene resin. For hybrid type films, the lamination order of the polyester resin layer and the polystyrene resin layer, as well as the number of each layer, are not particularly limited, but for example, a laminated film laminated in the order of polyester resin layer / polystyrene resin layer / polyester resin layer is an example. In particular, the above-mentioned hybrid type films, which are less prone to shrinkage and distortion even with rapid temperature increases due to high-temperature heating, can be suitably used.

[0059] Examples of polyester resins include various polyesters composed of dicarboxylic acid and diol components as essential constituents (i.e., polyesters containing at least constituent units (structural units) derived from dicarboxylic acid and constituent units derived from diol). The main examples include polymers and copolymers formed by the condensation reaction of dicarboxylic acid and diol. Among these, aromatic polyester resins are preferred from the viewpoint of rigidity, shrinkage characteristics, and heat resistance.

[0060] While there are no particular limitations on the aromatic polyester resin, a substantially amorphous modified aromatic polyester resin containing a modifying component (copolymer component) rather than being composed of a single repeating unit is preferred. A modified PET is preferably exemplified in which part of the dicarboxylic acid component and / or diol component is replaced with a modifying component (i.e., another dicarboxylic acid component and / or another diol component) in polyethylene terephthalate (PET) using terephthalic acid as the dicarboxylic acid component and ethylene glycol (EG) as the diol component. Examples of other dicarboxylic acid components include cyclohexanedicarboxylic acid, adipic acid, and isophthalic acid. Examples of other diol components include 1,4-cyclohexanedimethanol (CHDM) and neopentyl glycol (NPG).

[0061] The polystyrene resin is preferably a styrene-diene copolymer, more preferably a styrene-butadiene copolymer or a styrene-butadiene-styrene block copolymer (SBS). The polystyrene resin may also contain other styrene-diene copolymers, and may include general-purpose polystyrene (GPPS), high-impact polystyrene (HIPS), or styrene elastomers.

[0062] Furthermore, lubricants, fillers, heat stabilizers, antioxidants, ultraviolet absorbers, antistatic agents, colorants, etc., may be added to the resin constituting the heat-shrinkable film (base film) as appropriate.

[0063] The thickness of the heat-shrinkable film is, for example, 10 to 80 μm, preferably 20 to 60 μm, and more preferably 40 to 50 μm.

[0064] The thermal shrinkage rate of the heat-shrinkable film is not particularly limited, as long as it is sufficient to adhere to at least the outer surface of the container (adhesion object) through thermal shrinkage. The thermal shrinkage rate in the circumferential direction is not particularly limited, but is preferably 20% or more, more preferably 30% or more, and even more preferably 40% or more. Here, the thermal shrinkage rate is the circumferential (lateral) shrinkage rate when a heat-shrinkable film cut into a 5cm x 5cm square is immersed in a 140°C oil bath for 10 seconds.

[0065] The above film can be obtained, for example, by extruding a single-layer or multi-layer resin sheet made of the above resin using a T-type die, and then stretching it mainly in the TD direction (width direction) to impart heat shrinkability mainly in the TD direction (width direction) to form a film. In the case of a uniaxially stretched base film, the base film primarily exhibits thermal shrinkage in one direction. The stretching ratio is, for example, about 2 to 6 times in the main stretching direction (main shrinkage direction), which is one direction. The base film may also be stretched in a direction perpendicular to the main shrinkage direction at a ratio of about 1.01 to 2 times.

[0066] (Printing layer) A printed layer may be provided on the back of the main body of the shrink label for design display. The printed layer may have a design printed layer that displays text or images, and a background printed layer (for example, a solid white printed layer) laminated on the back side of the design printed layer to make the text or images look nice. When a printed layer is provided on the back of the base film (especially when the above-mentioned solid white printed layer is not provided), a transparent resin layer (cover layer) may be provided to cover the back of the printed layer for purposes such as protecting the printed layer. When a printed layer is provided on the back of the base film 2A, a film with excellent light transmittance (a colorless transparent film or a slightly colored transparent film) may be used as the base film. Furthermore, a printed layer, a slippery overcoat layer, a matte coat layer with a non-glossy effect, and the like may be appropriately provided on the front surface of the base film 2A. However, in order to maintain the adhesion of the center seal portion 25, it is preferable that the printed layer, etc., is not provided on the back surface of the first end portion 21 and the front surface of the second end portion 22 of the long strip-shaped base film 2A, or is provided very thinly. In this specification, "substrate film" is a term used regardless of whether or not it is printed, and it encompasses substrate films that have a printed layer.

[0067] Preferably, the shrink label 2(2D) has a guide marking 40a consisting of symbols such as arrows indicating the tearing direction and explanatory text provided on the gripping portion 5 and / or directly below the gripping portion 5 by the above-mentioned printed layer (see Figure 3). When gripping the gripping portion 5 and cutting off the cap portion 40, if the gripping portion 5 is pulled in the circumferential direction from the beginning, a lateral tear may occur, making it impossible to cut off the cap portion 40 along the diagonal perforation line 4. Therefore, it is preferable to use the guide marking 40a to guide the gripping portion 5 to be pulled downwards so that the angle with the axial direction X is less than 45° (preferably 30° or less, particularly preferably 15° or less) in order to prevent a lateral tear.

[0068] <Embodiment 1: Method for manufacturing a shrink-labeled container> The manufacturing method of this embodiment is the manufacturing method of the shrink-labeled container described above. The manufacturing method of this embodiment is A diagonal perforation line forming step is performed on a long, sleeve-shaped shrink label 2B that is folded along a first fold line 201 extending in the longitudinal direction, and a plurality of diagonal perforations 4 are formed at predetermined intervals in the longitudinal direction. After the diagonal perforation line formation process, the folding position is changed in a folding position change process so that the long, sleeve-shaped shrink label 2B is folded along a second fold line 202 that extends longitudinally at a circumferential position different from the first fold line 201. A horizontal perforation line forming step is performed in which multiple horizontal perforations 3 are formed at predetermined intervals in the longitudinal direction on a long, sleeve-shaped shrink label 2C that has been folded along a second fold line 202. A cutting process is performed in which the long, sleeve-shaped shrink label 2C, folded along the second fold line 202, is cut into individual sheets to form the tab portion 5. It is equipped with.

[0069] (Preparation of long sleeve-shaped shrink labels 2B) Before describing the features of the manufacturing method for shrink labels according to this embodiment, we will first describe an example of the process for producing a long sleeve-shaped shrink label 2B from a long strip-shaped base film 2A (heat-shrinkable film). Generally, shrink labels are provided in the form of a long sleeve-shaped shrink label (in a roll state, folded flat and wound up) formed by shaping a long strip-shaped base film 2A into a tubular form.

[0070] Shrink labels 2B are manufactured using various known manufacturing methods. For example, referring to Figure 7, shrink labels 2B can be manufactured by a manufacturing method that includes the following dispensing process, folding process, center sealing process, etc.

[0071] Referring to Figure 7(a), first, a process is carried out to unwind the long strip of base film 2A (a film on which a design, display, etc., has been printed in a separate process and which has been slit to a predetermined width) that has been wound onto a roll (unwinding process).

[0072] In the folding process, both sides of the base film 2A in the width direction (TD: transverse direction) are folded inward (to the back side) at a predetermined first fold line 201 (folding position) (Figure 7).

[0073] In the center sealing process, the back surface of the first side end 21 (one end in the width direction) of the base film 2A is bonded to the front surface of the second side end 22 (the other end in the width direction) (Figures 7(a) and (b)). In the center sealing process, first, a solvent (or adhesive) is applied to at least one of the back surface of the first end portion 21 and the front surface of the second end portion 22. For example, as shown in Figure 7(a), the solvent may be sprayed from the tip of the nozzle 72 onto the front surface of the second end portion 22, thereby applying the solvent to the front surface of the second end portion 22. With the back surface of the first end portion 21 and the front surface of the second end portion 22, both coated with a solvent (or adhesive), overlapping so that they are in contact with each other, the base film 2A is transported so that the adhesive surfaces pass between a pair of nip rolls 71, thereby bonding the back surface of the first end portion 21 and the front surface of the second end portion 22 together and forming the center seal portion 25 (see Figure 7).

[0074] In this way, a long, sleeve-shaped shrink label 2B is produced. This shrink label 2B is folded flat along the first fold line 201 during the center sealing process, etc. The shrink label 2B can be wound onto a roll in this folded state (sleeve shape) and transported and stored as a label roll. Alternatively, after center sealing, diagonal perforations 4 may be formed before being wound onto a roll.

[0075] (Diagonal perforation line formation process) In the diagonal perforation line formation process, multiple diagonal perforations 4 are formed at predetermined intervals along the longitudinal direction on a long, sleeve-shaped shrink label 2B that has been folded along a first fold line 201 extending in the longitudinal direction (MD: machine direction) (see Figure 5(a)). The long, sleeve-shaped shrink label 2B on which the diagonal perforations 4 have been formed may be wound onto a roll (see Figure 6(b)).

[0076] The diagonal perforations 4 are formed by a method that allows perforations to be formed on only one side of the elongated sleeve-shaped shrink label 2B. Specifically, for example, while protecting the film on the opposite side with an internally installed inner guide 24, the elongated sleeve-shaped shrink label 2B is continuously conveyed in the longitudinal direction, and one side of the shrink label 2B is intermittently irradiated with a laser by a laser irradiator 24a, and the irradiation position is scanned to form the diagonal perforations 4 (see Figures 6(a) and (a1)). Figure 6(a1) is a longitudinal cross-sectional view of the laser irradiation position in Figure 6(a). As the laser, carbon dioxide lasers, YAG lasers, etc. can be used, but carbon dioxide lasers that can efficiently intermittently cut (perforate) polyester resin films and polystyrene resin films are preferred. The diagonal perforations 4 may be formed by other methods.

[0077] Furthermore, unlike the horizontal perforation line 3, the diagonal perforation line 4 must be performed before the next folding position change step. This allows the horizontal perforation line formation step and the subsequent cutting step to be performed on long, sleeve-shaped shrink labels with different folding positions, thereby resolving the problems in the conventional manufacturing method shown in Figure 9. Only one tab 5 of an appropriate width is formed, and by sufficiently inclining the portion of the diagonal perforation line 4 that connects to the horizontal perforation line 3 with respect to the axial direction X, the label can be cut along the diagonal perforation line 4, and then the label can be neatly cut along the horizontal perforation line 3.

[0078] The processes from the diagonal stitching line formation process onward may be carried out by an automatic mounting machine.

[0079] (Folding position change process) The folding position change process is performed after the diagonal perforation line formation process. In the folding position changing process, the folding position of the elongated sleeve-shaped shrink label 2B is changed so that it is folded along a second fold line 202 that extends longitudinally at a circumferential position different from the first fold line 201.

[0080] The folding position change process can be carried out, for example, using a folding direction change guide 60. As the folding direction change guide 60, for example, a tetrahedron-shaped member (tetra guide) can be used. Specifically, as shown in Figures 8 and 9, for example, a folding direction changing guide 60 is inserted into the elongated sleeve-shaped shrink label 2B so as to be able to move relative to it, and the upstream nip roll 61 and the downstream nip roll 62 of the folding direction changing guide 60 are positioned at a predetermined angle of twist. This makes it possible to change the folding position of the shrink label 2B (fold it back) so that a new second fold line 202 is formed in the middle of the width direction of the shrink label 2B. The technique for changing the folding position of an elongated sleeve-shaped shrink label in this way is disclosed, for example, in Japanese Utility Model Publication No. 7-44574.

[0081] The "circumferential position different from the first fold line" which is the folding position of the second fold line 202 is not particularly limited, but for example, it is a position shifted by 90° in the circumferential direction with respect to the first fold line 201. However, it is preferable that the folding position is set (the folding position is shifted) so that the folding position of the second fold line 202 after the change in folding position is in the center of the formation position of the gripping part 5. It is sufficient that the folding position can be shifted in this way, and the change in the circumferential angle of the folding position is not limited to 90°.

[0082] This operation of changing the folding position (folding back) is performed by a shrink label attachment device (shrink labeler) just before attaching it to the container. This creates the first fold line 201 and the second fold line 202, making it easier to unfold the sleeve-shaped shrink label when attaching it to the container, and allowing the shrink label to be attached neatly to the container. Furthermore, the aforementioned folding technique has been used conventionally to make sleeve-shaped shrink labels easier to unfold, and compared to that, the folding position change process in this embodiment does not particularly increase the number of manufacturing steps.

[0083] The above folding position modification process yields a long, sleeve-shaped shrink label 2C that is folded flat along the second fold line 202. The long, sleeve-shaped shrink label 2C folded along the second fold line 202 may be wound onto a roll (see Figure 6(c)).

[0084] (Process for forming horizontal perforations) In the horizontal perforation line formation process, multiple horizontal perforations 3 are formed at predetermined intervals in the longitudinal direction on the long sleeve-shaped shrink label 2C (after the folding position change process) that has been folded along the second fold line 202.

[0085] In this embodiment, the formation of the horizontal perforations 3 is performed on the elongated, sleeve-shaped shrink label 2C, which has been folded flat after the folding position change process, before the cutting process (formation of the tab). However, the horizontal perforation line formation process may be performed before the folding position change process or after the folding position change process. If the horizontal perforation line 3 is formed after the folding position change process, the horizontal perforation line 3 may be formed before the cutting process described later or may be performed almost simultaneously with the cutting process. Note that since the long sleeve-shaped shrink label with the horizontal perforation line 3 formed is prone to tearing during transport, it is preferable to perform the horizontal perforation line formation process after the folding position change process and immediately before the cutting process.

[0086] The horizontal perforations 3 are formed, for example, by continuously conveying a long, sleeve-shaped shrink label 2C in the longitudinal direction (MD: machine direction) using a perforating blade (such as a perforated Thomson blade or die set blade) that extends across the width direction.

[0087] (Cutting process) In the cutting process, the long, sleeve-shaped shrink label 2C, folded along the second fold line 202, is cut into individual sheets (to a predetermined length) to form the tab portion 5.

[0088] For example, referring to Figure 5, a single-sheet shrink label 2D having a tab 5 can be produced by making cuts along the cut line 23 shown in Figure 5(b) at predetermined intervals in the longitudinal direction (MD) of a long, sleeve-shaped shrink label 2C that has been folded flat along the second fold line 202 (Figure 5(c)). In this way, when cutting the long, sleeve-shaped shrink label 2C to divide it into the size of a single-sheet shrink label 2D, a tab 5 can be formed on the single-sheet shrink label 2D by making a part of the cut line 23 the shape corresponding to the tab 5. Furthermore, when cutting the long (sleeve-shaped) shrink label 2B, if the cut is made in such a way that the above-mentioned tab 5 is formed, a notch 51 with the same shape as the tab 5 will inevitably be formed on the lower edge 2y of the cut sheet of shrink label 2C (see Figure 5(c)).

[0089] The shrink label 2B is cut, for example, by continuously conveying a long, sleeve-shaped shrink label 2C in the longitudinal direction (MD: machine direction) and feeding it between cutting blades (receiving blade and pushing blade) that extend in the width direction, and cutting it by clamping it between the cutting blades (a so-called guillotine method). Other cutting methods, such as die cutting, may also be used.

[0090] The cutting process is carried out, for example, in an automatic shrink label application machine. A long, sleeve-shaped shrink label 2C is continuously cut in the automatic shrink label application machine to form single-sheet sleeve-shaped shrink labels 2D, which are then expanded into a cylindrical shape and fitted onto the outside of a container.

[0091] By performing this cutting process, a sheet-sleeve-shaped shrink label 2D (see Figures 4 and 5(c)) having a tab at its upper edge 2x is obtained.

[0092] This shrink label 2D is folded flat along the second fold line 202. Here, as shown in Figure 5(c), the shrink label 2D has a first fold line 201 formed along the axial direction X from the upper edge 2x to the lower edge 2y. More precisely, it is the trace of the first fold line 201 formed during the folding process in the production of the long sleeve-shaped shrink label 2B that remains. Note that fold lines (first fold line 201 and second fold line 202) are visible on the shrink label 2(2D) before heat shrinking (see Figures 2 to 4).

[0093] The sheet-sleeve-shaped shrink label 2D is opened into a cylindrical shape before being fitted onto the container. Although the shrink label 2D shown in Figure 4(C) is folded along the second fold line 202, in an actual automated application machine, it is opened immediately after the cutting process and fitted onto the container with folds at four points in the circumferential direction. By heat-shrinking the externally fitted shrink label 2D, a shrink-labeled container 1 with the shrink label 2 attached can be manufactured.

[0094] <Embodiment 2: Modification 1 of the method for manufacturing a shrink-labeled container> The manufacturing method of this embodiment is the same as the manufacturing method of shrink labels described above. The manufacturing method of this embodiment is Preparation steps include: preparing a long, sleeve-shaped shrink label that is folded along a first fold line 201 extending in the longitudinal direction and has multiple diagonal perforations 4 at predetermined intervals in the longitudinal direction; A folding position modification step involves changing the folding position of a long, sleeve-shaped shrink label so that it is folded along a second fold line that extends longitudinally at a circumferential position different from the first fold line 201. A horizontal perforation line forming step is performed on a long, sleeve-shaped shrink label folded along a second fold line, in which multiple horizontal perforations are formed at predetermined intervals in the longitudinal direction. The cutting process involves cutting a long, sleeve-shaped shrink label, folded along the second fold line, into individual sheets to form the tab, and then... It is equipped with.

[0095] In other words, the manufacturing method of this embodiment does not perform the diagonal perforation line formation step in the manufacturing method of Embodiment 1, but instead includes a preparation step of preparing a long sleeve-shaped shrink label 2B that is folded along a first fold line 201 extending in the longitudinal direction and has a plurality of diagonal perforations 4 at predetermined intervals in the longitudinal direction. Otherwise, it is basically the same as Embodiment 1.

[0096] In the preparation process, for example, a long sleeve-shaped shrink label 2B (see Figure 6(b)) with diagonal perforations 4 can be prepared by receiving a roll of these labels from a label manufacturer or the like. The preparation process may also include preparing the roll of long sleeve-shaped shrink labels 2B so that it can be unwound in order to carry out the folding position change process.

[0097] (Method for manufacturing long sleeve-shaped shrink labels) The present invention relates to a method for manufacturing a shrink-labeled container according to this embodiment, and also to a method for manufacturing a long sleeve-shaped shrink label prepared in the above preparation step. The manufacturing method includes a diagonal perforation line forming step, in which diagonal perforations 4 are formed at predetermined intervals on a long, sleeve-shaped shrink label 2B that is folded along a first fold line 201 extending in the longitudinal direction.

[0098] The long, sleeve-shaped shrink labels 2B with diagonal perforations 4, manufactured in this manner by a label manufacturer, are delivered in a rolled state (see Figure 6(b)) to, for example, manufacturers of shrink-labeled containers (food manufacturers, pharmaceutical manufacturers, etc.). At the shrink-labeled container manufacturer, the above-mentioned folding position change process, horizontal perforation process, and cutting process (cut with tab) are carried out using an automatic attachment machine, etc., to form individual shrink labels that are then attached to the containers.

[0099] Furthermore, label manufacturers and the like may perform the above-mentioned folding position change process after the diagonal perforation line formation process. For shrink label container manufacturers and the like, the long sleeve-shaped shrink label 2C (see Figure 6(c)) wound onto a roll after the folding position change process will not undergo the folding position change process, and only the process after the folding position change process will be performed. Furthermore, the long, sleeve-shaped shrink label 2C shown in Figure 6(c) may be further perforated horizontally 3 to form a roll, which may be manufactured by a label manufacturer or the like, and a cutting process may be carried out on this roll by a manufacturer that produces shrink-labeled containers.

[0100] <Embodiment 3: Modification 2 of the method for manufacturing shrink labels> The manufacturing method of this embodiment is the same as the manufacturing method of shrink labels described above. The manufacturing method of this embodiment is A diagonal perforation line forming step is performed in which multiple diagonal perforations 4 are formed at predetermined intervals in the longitudinal direction on a long, strip-shaped base film 2A. A folding process in which both sides of the base film 2A in the width direction are folded inward along the first fold line 201, A center sealing step is performed in which the back surface of one end of the base film 2A in the width direction and the front surface of the other end in the width direction are bonded together after the folding step. A horizontal perforation line forming step is performed in which multiple horizontal perforations 3 are formed at predetermined intervals in the longitudinal direction on a long sleeve-shaped shrink label folded along the first fold line 201 obtained in the center sealing step, A cutting process involves cutting a long, sleeve-shaped shrink label folded along the first fold line 201 into individual sheets to form the tab portion 5. It is equipped with.

[0101] In other words, in this embodiment, the formation of the diagonal perforations 4 in the shrink label manufacturing method of Embodiment 1 is performed on the long strip-shaped base film 2A before the center sealing step described above is carried out. The manufacturing method of this embodiment differs from the manufacturing method of Embodiment 1 mainly in this respect.

[0102] In this embodiment, by folding at a predetermined position intersecting the diagonal perforation line 4 and performing a center seal to join both ends in the width direction, it is not necessary to actually perform a folding position change process. However, for a material that has been folded at a position other than the predetermined position intersecting the diagonal perforation line 4 and a center seal to join both ends in the width direction, the folding position may be changed to the predetermined position and then cut (pinched) to make it easier to unfold before attaching it to the object.

[0103] Furthermore, forming the diagonal perforations 4 after the center sealing process (and preferably before winding into a roll), as in Embodiment 1, is preferable because it reduces the possibility of the diagonal perforations 4 tearing during processes such as the center sealing process in which the base film is formed into a cylindrical shape.

[0104] The present invention is not limited to the embodiments described above and can be modified in various ways. Two or more embodiments selected from the various embodiments described above may be combined as appropriate, or at least one configuration (part of a configuration) selected from the various embodiments described above may be replaced with a part of a configuration of another embodiment. [Explanation of symbols]

[0105] 2 shrink labels 2A Base film (long strip) 2B Shrink Label (Long sleeve-shaped, folded along the first fold line) 2C shrink label (long sleeve-shaped, folded along the second fold line) 2D shrink labels 2x upper edge 2y lower edge 201 First fold line 202 Second fold line 21 First side end 21a 1st side edge 22 Second side end 22a 2nd side edge 23 Cut line 24 Inner Guide 24a Laser irradiator 25 Center seal section 3. Horizontal stitching line 30 Main body 4. Diagonal stitching line 4a top end 4b Bottom edge 4c,4d in place 4X cuts 4Y fracture section 40 Cap section 40a guidance display 41, 42, 43 Fracture lines 42a, 43a Lower part 44a, 44b, 44c cuts 5. Pinching part 51 Notch 60 Folding Position Change Guide 61, 62, 63 Nipple Roll 71 Nip Roll 72 nozzles 8 containers with caps 81 Container body 82 Cap X-axis direction α, β, γ angles A interval B Length

Claims

1. A method for manufacturing a shrink-labeled container, comprising heat-shrinking and attaching a cylindrical shrink label, whose primary shrinkage direction is circumferential, to a container, The aforementioned shrink label is A handle is provided on a part of the upper edge, The horizontal stitching lines extend in the circumferential direction, A diagonal stitch line extending from the upper edge to the horizontal stitch line, The aforementioned gripping portion comprises a fold line that passes through the circumferential center and extends axially, The aforementioned diagonal stitching line is provided at an inclination with respect to the axial direction, extending circumferentially from approximately one end of the gripping portion of the upper edge toward the horizontal stitching line, and crossing the fold line. A diagonal perforation line forming step, in which a plurality of diagonal perforations are formed at predetermined intervals in the longitudinal direction on a long sleeve-shaped shrink label folded along a first fold line extending in the longitudinal direction, After the diagonal perforation line formation step, the folding position is changed such that the elongated sleeve-shaped shrink label is folded along a second fold line that extends longitudinally at a circumferential position different from the first fold line. A horizontal perforation line forming step, in which a plurality of horizontal perforations are formed at predetermined intervals in the longitudinal direction on the long sleeve-shaped shrink label that has been folded along the second fold line, A cutting step is performed to cut the long, sleeve-shaped shrink label, which has been folded along the second fold line, into individual sheets to form the tab portion. A manufacturing method that includes the following features.

2. A method for manufacturing a shrink-labeled container, comprising heat-shrinking and attaching a cylindrical shrink label, whose primary shrinkage direction is circumferential, to a container, The aforementioned shrink label is A handle is provided on a part of the upper edge, The horizontal stitching lines extend in the circumferential direction, A diagonal stitch line extending from the upper edge to the horizontal stitch line, The aforementioned gripping portion comprises a fold line that passes through the circumferential center and extends axially, The aforementioned diagonal stitching line is provided at an inclination with respect to the axial direction, extending circumferentially from approximately one end of the gripping portion of the upper edge toward the horizontal stitching line, and crossing the fold line. Preparation steps include: preparing a long, sleeve-shaped shrink label that is folded along a first fold line extending in the longitudinal direction and has multiple diagonal perforations at predetermined intervals in the longitudinal direction; A folding position modification step is performed to change the folding position of the long, sleeve-shaped shrink label so that it is folded along a second fold line that extends longitudinally at a circumferential position different from the first fold line. A horizontal perforation line forming step, in which a plurality of horizontal perforations are formed at predetermined intervals in the longitudinal direction on the long sleeve-shaped shrink label that has been folded along the second fold line, A cutting step is performed to cut the long, sleeve-shaped shrink label, which has been folded along the second fold line, into individual sheets to form the tab portion. A manufacturing method that includes the following features.

3. A method for manufacturing a shrink-labeled container according to claim 2, wherein the method for manufacturing the elongated sleeve-shaped shrink label prepared in the preparation step is as follows: A manufacturing method comprising a diagonal perforation line forming step, in which a plurality of diagonal perforations are formed at predetermined intervals in the longitudinal direction on a long sleeve-shaped shrink label that has been folded along a first fold line extending in the longitudinal direction.

4. A method for manufacturing a shrink-labeled container, comprising heat-shrinking and attaching a cylindrical shrink label, whose primary shrinkage direction is circumferential, to a container, The aforementioned shrink label is A handle is provided on a part of the upper edge, The horizontal stitching lines extend in the circumferential direction, A diagonal stitch line extending from the upper edge to the horizontal stitch line, The aforementioned gripping portion comprises a fold line that passes through the circumferential center and extends axially, The aforementioned diagonal stitching line is provided at an inclination with respect to the axial direction, extending circumferentially from approximately one end of the gripping portion of the upper edge toward the horizontal stitching line, and crossing the fold line. A diagonal perforation line forming step, in which a plurality of diagonal perforations are formed at predetermined intervals in the longitudinal direction on a long, strip-shaped base film, A folding step in which both sides in the width direction of the base film are folded inward along the first fold line, A center sealing step is performed in which the back surface of one end in the width direction of the base film after the folding step is bonded to the front surface of the other end in the width direction. A horizontal perforation line forming step is performed in which a plurality of horizontal perforations are formed at predetermined intervals in the longitudinal direction on the long sleeve-shaped shrink label folded along the first fold line obtained in the center sealing step, A cutting step is to cut the long, sleeve-shaped shrink label, which has been folded along the first fold line, into individual sheets to form the tab portion, A manufacturing method that includes the following features.

5. A shrink-labeled container is formed by heat-shrinking a cylindrical shrink label, whose primary shrinkage direction is circumferential, onto the container. The aforementioned shrink label is A handle is provided on a part of the upper edge, The horizontal stitching lines extend in the circumferential direction, A diagonal stitch line extending from the upper edge to the horizontal stitch line, The aforementioned gripping portion comprises a fold line that passes through the circumferential center and extends axially, A shrink-labeled container, wherein the diagonal perforation line is provided at an inclination with respect to the axial direction, extending circumferentially from approximately one end of the tab portion on the upper edge toward the horizontal perforation line, and crossing the fold line.

6. The aforementioned diagonal perforation line includes multiple break lines, which are continuous linear portions consisting of multiple cuts arranged along the cutting direction and breaks between multiple cuts. In the range from at least the upper end of the diagonal perforation line to a predetermined position, a plurality of the break lines are provided at intervals in the circumferential direction. A shrink-wrapped container according to claim 5.

7. The aforementioned diagonal perforation line includes at least one break line, which is a continuous linear portion consisting of a plurality of cuts arranged along the direction of cutting and a break between the plurality of cuts. In the aforementioned fracture line, adjacent breaks in the circumferential direction have portions that overlap each other in the axial direction. A shrink-wrapped container according to claim 5.

8. A tubular shrink label in which the primary shrinkage direction is circumferential, A handle is provided on a part of the upper edge, The horizontal stitching lines extend in the circumferential direction, A diagonal stitch line extending from the upper edge to the horizontal stitch line, The aforementioned gripping portion comprises a fold line that passes through the circumferential center and extends axially, The diagonal perforation line is provided at an angle with respect to the axial direction, extending circumferentially from approximately one end of the tab portion on the upper edge toward the horizontal perforation line, and crossing the fold line, in a shrink label.

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