JP2017043386A - Packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container in which occurrence of tear failure can be suppressed and of which an opening can be easily formed.SOLUTION: A packaging container in which plural front face tear guide parts (20) are formed on a front face sheet (10), plural back face tear guides are formed on a back face sheet, and the front face sheet (10) and the back face sheet are so joined to each other that each front face tear guide part (20) and each back face tear guide part overlap on each other in a thickness direction of each sheet or a region between respective front face tear guide parts (20) and each back face tear guide part overlap on each other in a thickness direction of each sheet. Each front face tear guide part (20) has a front face extroversion bend (28), each back face tear guide part has a back face extroversion bend, at least one front face changeover guide part (30) is formed on the front face sheet (10) and at least one back face changeover guide is formed on the back face sheet.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging container.

  2. Description of the Related Art Conventionally, as a packaging container for storing contents such as food, a container in which a top sheet and a back sheet are joined to face each other is known. Such a packaging container is often formed with a tear guiding portion for guiding tearing of each sheet at the time of opening.

  For example, in Patent Document 1, in a packaging container in which a top sheet and a back sheet are joined so as to face each other, each top sheet has a linear shape extending from the left edge to the right edge of the top sheet. A plurality of tear guiding portions having a shape extending in the direction is formed, and the back sheet is curved so that each of the back sheet extends from the left edge to the right edge of the back sheet and protrudes outward (upper side). The thing in which the some tear induction | guidance | derivation part which has the shape to form was formed is disclosed. The opening of the packaging container is usually performed along the tear guide part by removing the part to be cut, which is the outer part (upper side) of the tear guide part, of the packaging container from the inner side (lower side) of the tear guide part. This is performed by pulling downward toward the front side or by pushing downward on the back side. In this way, when the cut portion is cut from the packaging container by tearing each sheet along the tear guide portion, the bulging portion that bulges outward from the tear guide portion of the top sheet is provided on the back sheet. Is formed. Since this bulging portion functions as a picking allowance, it is easy to form an opening in the packaging container.

  Further, in Patent Document 2, each of the front sheet and the back sheet includes a plurality of linear tearing guide portions each having a shape extending linearly from the left edge portion to the right edge portion of each sheet. There is disclosed a packaging container in which a plurality of V-shaped guide portions that connect linear tear guide portions to each other are formed. Each V-shaped guide part is formed in a shape that is inclined so as to gradually approach a central guide part located at the center of the plurality of linear tear guide parts as it goes from the left edge part to the right edge part. . In this packaging container, even if the tearing of each sheet is started from any one of the plurality of linear tearing guiding portions, the tearing along the central guiding portion is finally performed. Be guided. For example, even when the tearing is started from the outermost guiding part located on the outermost side among the plurality of linear tearing guiding parts, by finally passing through the V-shaped guiding part during the tearing, Is guided to be torn along the central guide. That is, in the packaging container described in Patent Document 2, it is suppressed that each sheet is torn in a region different from the region in which the plurality of linear tear guiding portions are formed.

JP 2013-71733 A Japanese Patent No. 4760030

  In the packaging container described in Patent Document 1, the portion to be cut located outside the tear guide portions with the topsheet positioned in front is placed on the back side with respect to the inner portion of the tear guide portions. When tearing to push, or tearing the part to be excised with respect to the inner part of each tear guide part with the back sheet positioned in front, tear failure may occur. is there. For example, when tearing the to-be-cut portion with the back sheet positioned in front, the lower end portion of the top sheet at the cut portion interferes with the upper end portion of the bulging portion of the back sheet. Occurs. For this reason, a large force is required for tearing, and by tearing against the resistance, the upper end portion of the bulging portion is plastically deformed so that the upper end portion of the bulging portion becomes corrugated. This results in a tear failure.

  On the other hand, in the packaging container described in Patent Document 2, such a tear failure is unlikely to occur. For example, in the case where the top sheet is torn to pull the part to be excised in a state where the top sheet is located in front, the tear is out of the outermost guide part of the top sheet and the plurality of linear guide parts of the back sheet. Even if it is started along with the linear guide part located inside the outermost guide part, the lower end part of the back sheet in the part to be cut is a part of the surface sheet excluding the part to be cut. Even if the tearing is started so as to interfere with the upper end, the tearing of the top sheet is in the middle of the tearing than the linear guiding part that is torn in the back sheet by way of the V-shaped guiding part. Since it is performed along the linear tearing guide portion located on the inner side, interference between the sheets is easily avoided. However, in the packaging container described in Patent Document 2, it is difficult to form an opening in the packaging container because a picking margin is not formed after the portion to be cut is cut along the linear guide portion.

  The objective of this invention is providing the packaging container which can suppress generation | occurrence | production of a tearing defect and can form opening easily.

  In order to solve the above-mentioned problem, the present invention is a packaging container in which a top sheet and a back sheet are joined so as to face each other, and each top sheet has a specific edge from the top sheet. A plurality of surface tear guide portions that extend to reach the other edge portions and are spaced apart from each other and that induce tearing of the top sheet are formed. The surface sheet has a shape that extends from a specific edge of the sheet to another edge and is spaced apart from each other, and is formed with a plurality of back surface tear induction portions that guide tearing of the back surface sheet. And the back surface sheet, each front surface tear guide portion and each back surface tear guide portion overlap each other in the thickness direction of each sheet, or the region between each front surface tear guide portion and each back surface tear guide Are joined so as to overlap each other in the thickness direction of each sheet, and each surface tear guide portion is curved so as to be convex toward the outside of the surface sheet with respect to the center of the surface sheet Each of the back surface tear guiding portions has a back surface outward curved portion having a shape that curves toward the outside of the back surface sheet with respect to the center of the back surface sheet. The surface sheet has tearing along the specific surface tear induction part among the plurality of surface tear induction parts and from the specific edge part toward the other edge part. The specific surface tear guiding portion and the specific surface tear guiding portion so that the tearing can be switched to another along the surface tear guiding portion formed at a position closer to the center of the surface sheet than the specific surface tear guiding portion. And at least one surface switching induction portion for inducing tearing of the topsheet, and the backsheet is formed from the specific edge portion to the other edge portion. The tearing along the specific back surface tear guiding part among the plurality of back surface tear guiding parts is closer to the center of the back sheet than the specific back surface tear guiding part among the plurality of back surface tear guiding parts Connecting the specific back surface tear guiding part and the other back surface tear guiding part so as to be switched to tearing along the other back surface tear guiding part formed on the back surface, and at least inducing tearing of the back sheet Provided is a packaging container in which one back surface switching guiding portion is formed.

  In the present packaging container, when both sheets are torn along the respective guiding portions from the specific edge toward the other edge, a portion that bulges outward is formed in the opening of both sheets, that is, In addition, since the tab allowance is formed in the opening, it becomes easy to form the opening, and further, each along the front surface tear guide portion and the back surface tear guide portion formed at positions shifted from each other in the thickness direction of each sheet. Even when the tearing of the sheet is started, the occurrence of a tear failure is suppressed.

  For example, the surface sheet is positioned in front, and the part of the packaging container that is outside of each tear guide part is the part of the packaging container that is inside of each tear guide part (the side closer to the center of each sheet). In the case of tearing each sheet so that it is pulled downward toward the front, when tearing of each sheet is started along a specific back surface tear guiding portion and a specific front surface tear guiding portion formed outside this In the initial stage of tearing, the lower end of the portion outside the back surface tear guiding portion of the back sheet interferes with the upper end portion of the surface sheet inside the surface tear guiding portion, but during the tearing, In the surface sheet, along the surface switching induction part, along the other surface tear induction part formed inside the specific surface tear induction part from tearing along the specific surface tear induction part Pull It is switched to come. Here, in each sheet, each front surface tear guide portion and each rear surface tear guide portion overlap each other in the thickness direction of each sheet, or each region between each front surface tear guide portion and each rear surface tear guide portion has each Since they are joined so as to overlap each other in the thickness direction of the sheet, the other front surface tear guide portion is located inside the specific back surface tear guide portion. For this reason, interference of both sheets during tearing after passing through the surface switching guiding portion is avoided. This means that the surface sheet is positioned in front, and the outer side of each tear guiding portion of the packaging container is located on the inner side (the side closer to the center of each sheet) of each tear guiding portion of the packaging container. When tearing each sheet so as to push it downward toward the back side, tearing of each sheet starts along a specific front surface tear guiding portion and a specific back surface tear guiding portion formed outside this The same applies to the time when it is done. Therefore, the occurrence of poor tearing is suppressed.

  In this case, the at least one surface switching induction portion includes a first surface switching induction portion that connects the specific surface tear induction portion and the other surface tear induction portion, and the specific surface tear induction portion. A portion closer to the other edge of the surface sheet than an intersection between the specific surface tear guiding portion and the first surface switching guiding portion, and the other surface tear guiding portion among the other surface tear guiding portions And at least one back surface switching guiding portion that connects a portion closer to the other edge portion of the top sheet than an intersection of the first surface switching guiding portion and the first surface switching guiding portion. Are a first back surface switching induction portion that connects the specific back surface tear induction portion and the other back surface tear induction portion, and the specific back surface tear induction portion and the first back surface among the specific back surface tear induction portions. The back surface sheet is more than the intersection with the switching guide. Near the other edge of the back sheet, and the other edge of the back sheet from the intersection of the other back surface tear guiding part and the first back surface switching guiding part among the other back surface tear guiding parts. It is preferable to have the 2nd back surface switching guidance | induction part which connects a near site | part.

  In this way, when each sheet is torn along a specific surface tear guiding portion and a specific back surface tear guiding portion from a specific edge toward another edge, the occurrence of defective tears is more reliably suppressed. Is done. Specifically, two surface switching induction parts are connected to a specific surface tear induction part, and similarly, two back surface switching induction parts are connected to a specific back surface tear induction part. Compared with the case where the switching guiding part and the single back surface switching guiding part are formed, switching from a specific surface tear guiding part to another surface tear guiding part is more reliably performed during the tearing.

  Specifically, a surface reference straight line parallel to a line segment connecting the intersection of the specific edge portion of the surface sheet and the surface tear induction portion and the center of the surface sheet, the second surface switching induction portion, and the The surface second angle formed by the surface second inclination of the second surface switching guiding portion at the intersection with the specific surface tear guiding portion is the surface reference straight line, the first surface switching guiding portion, and the specific surface. The intersection between the specific edge of the back sheet and the back surface tear guide portion is greater than the first surface angle formed by the surface first inclination of the first surface switching guide portion at the cross point with the tear guide portion. A back surface reference straight line parallel to a line connecting the center of the back surface sheet, and a back surface second inclination of the second back surface switching guide portion at the intersection of the second back surface switching guide portion and the specific back surface tear guide portion. , The second corner of the back surface, the back surface reference straight line and the 1 backside switching guide section and a rear surface first slope of the first rear-side switching inductive portion at the intersection with the particular backside tearing guide portion, it is preferable form larger than the back side first angle of.

  In this way, the occurrence of a tear failure when tearing each sheet along each tear guiding portion with a tearing force including a component from a specific edge of each sheet toward the center of the sheet is more reliably suppressed. The Usually, when each sheet is torn, the surface second corner becomes the surface first corner because the sheet is torn in a substantially the same direction and with a tear force of almost the same size from a specific edge to another edge. Of the tearing force, the component in the direction orthogonal to the second surface inclination, that is, the component in the direction away from the specific surface tear guiding part (toward the other surface tear guiding part) is the tearing force. It becomes larger than the component in the direction orthogonal to the surface first inclination of the force. For this reason, even if it is a case where switching via the 1st surface switching induction part is not made, it becomes easy to be changed via the 2nd surface switching induction part after that. The same applies to the back side. Therefore, the occurrence of defective tears is more reliably suppressed.

  Further, in the present invention, the surface tear region in which the plurality of surface tear induction portions are formed in the surface sheet is the closest to the center of the surface sheet among the plurality of surface tear induction portions. There is a surface blocking region formed between the inner surface tear guiding portion and the surface tear guiding portion located outside the innermost surface tear guiding portion among the plurality of surface tear guiding portions. The surface blocking region has a shape continuously connected so as to reach the other edge from the specific edge of the surface sheet without being divided by the surface switching guide part, Among the plurality of back surface tear guide portions, the innermost back surface tear guide portion formed at a position closest to the center of the back surface sheet, and the plurality of back surface tear guide portions. Back of A back surface prevention region formed between the back surface tear induction part located outside the back surface sheet with respect to the innermost back surface tear induction part, and the back surface prevention region is the back surface switching region. It is preferable to have a shape that is continuously connected so as to reach the other edge from the specific edge of the back sheet without being divided by the guide part.

  If it does in this way, it will be suppressed that each sheet is torn in the field inside the innermost surface tear induction part among the surface sheets, and the area inside the innermost back surface tear induction part among the back sheets. Specifically, since the surface tear region has a surface blocking region and the back surface tear region has a back surface blocking region, it is assumed that the tearing force is large and outside the innermost surface tear guiding part and the innermost back surface tearing guiding part. Even if each sheet is torn to the inner side so as to cross each blocking region from the located tear guiding portion, after that the sheet is torn along the innermost surface tear guiding portion and the innermost back surface tear guiding portion. Be guided. Therefore, tearing of each sheet is effectively suppressed in a region inside the innermost surface tear guiding portion and a region inside the innermost back surface tear guiding portion (region where tearing is not scheduled).

  Further, in the present invention, each surface tear guiding portion and the at least one surface switching guiding portion have a vertical bisector connecting a line segment connecting the specific edge portion and the other edge portion of the surface sheet. Each of the back surface tear guide portions and the at least one back surface switching guide portion has a symmetric shape as a symmetry axis, and each of the at least one back surface switching guide portion has a vertical line segment connecting the specific edge portion and the other edge portion of the back surface sheet. It is preferable to have a symmetric shape with the bisector as the axis of symmetry.

  In this way, both when starting tearing of each sheet from a specific edge toward the other edge and when starting tearing of each sheet from the other edge toward the specific edge The occurrence of defective tearing is effectively suppressed.

  As described above, according to the present invention, it is possible to provide a packaging container that can suppress the occurrence of defective tearing and can easily form an opening.

It is a front view of the packaging container of one Embodiment of this invention. It is the elements on larger scale of each surface tear induction | guidance | derivation part of the packaging container shown in FIG. It is a figure which shows the relationship between tearing force and the shape of each surface switching induction | guidance | derivation part. It is a figure which shows the example of transition of the site | part by which each sheet | seat is torn.

  A packaging container according to an embodiment of the present invention will be described with reference to FIGS. In the following description, the vertical and horizontal directions are based on FIG.

  As shown in FIG. 1, the packaging container of the present embodiment includes a top sheet 10 and a back sheet (not shown). Both sheets are joined to face each other. Specifically, as shown in FIG. 1, each sheet is formed in a rectangular shape, and the left edge portions 11, the right edge portions 12, the upper edge portions 13, and the lower edge portions 14. Are joined together. Each sheet is composed of a laminated film in which a base film layer, a barrier layer, and a sealant layer are laminated and bonded in this order.

  A plurality of surface tear induction portions 20 and a plurality of surface switching induction portions 30 are formed on the surface sheet 10. Similarly, a plurality of back surface tear induction portions and a plurality of back surface switching induction portions are formed on the back surface sheet. In the present embodiment, each sheet is formed in a plane-symmetric shape with the joint surface between the two as a symmetry plane. Therefore, only the top sheet 10 will be described below, and description of the back sheet will be omitted. In addition, a display portion is formed in each of the surface tear region 20S in which the plurality of surface tear guide lines 20 are formed in the surface sheet 10 and in the back surface tear region in which the plurality of back surface tear guide lines are formed in the back sheet. Yes.

  Each surface tear guiding portion 20 is a portion that induces tearing of the topsheet 10. The surface tear guide 20 is formed by laser light irradiation (so-called half-cut processing). Each surface tear guiding portion 20 has a shape that extends from the left edge portion 11 to the right edge portion 12 of the topsheet 10 and that is spaced apart from each other in the vertical direction. Here, “to reach” means reaching an edge and is not limited to traversing. In the present embodiment, each surface tear guiding portion 20 is set in a symmetric shape with a vertical bisector L connecting a line segment connecting the left edge portion 11 and the right edge portion 12 of the topsheet 10 as a symmetry axis. . Further, the entire packaging container is set in a symmetrical shape with the vertical bisector L as the axis of symmetry. Hereinafter, a portion on the left side of the vertical bisector L of each surface tear guiding portion 20 will be described.

  Each surface tear guiding portion 20 includes a surface straight portion 26, a surface inwardly curved portion 27, and a surface outwardly curved portion 28.

  The surface straight part 26 has a shape extending along the direction perpendicular to the perpendicular bisector L from the left edge part 11 toward the right edge part 12.

  The surface inward bending portion 27 extends from the right end portion of the surface straight portion 26 toward the vertical bisector L and is curved so as to be convex toward the center O (inside) of the surface sheet 10. Has a shape. Specifically, the radius of curvature of the surface inwardly curved portion 27 is set to 50 mm. The center O is a point located on the vertical bisector L and at the center between the upper end of the topsheet 10 and the bottom end of the topsheet 10.

  The surface outward curve 28 extends from the right end of the surface inward curve portion 27 so as to reach the vertical bisector L, and toward the outside (upper side) of the surface sheet 10 with the center O as a reference. It has a shape that curves so as to be convex. Specifically, the curvature radius of the surface outward curved portion 28 is set to 50 mm.

  As shown in FIG. 2, in the present embodiment, the plurality of surface tear induction portions 20 include five (5) surface tear induction portions 20, that is, an outermost surface tear induction portion 21, and a second surface tear induction portion. The guide portion 22, the center surface tear guide portion 23, the fourth surface tear guide portion 24, and the innermost surface tear guide portion 25 are provided. However, the number of surface tear induction | guidance | derivation parts is not restricted to this.

  The outermost surface tear guiding portion 21, the second surface tear guiding portion 22, the central surface tear guiding portion 23, the fourth surface tear guiding portion 24, and the innermost surface tear guiding portion 25 are arranged on the outer side (upper edge portion 13) of the topsheet 10. From the side) toward the center O in this order. In the present embodiment, the dimension from the outermost surface tear guiding portion 21 to the innermost surface tear guiding portion 25 is set to 2.4 mm. That is, the dimension between the respective surface tear guiding portions 21 to 25 is set to 0.6 mm. In addition, the dimension H1 between the surface straight line portion 26 in the central surface tear guiding portion 23 and the apex of the surface outward curved portion 28 (the point where the central surface tear guiding portion 23 and the perpendicular bisector L intersect) is: It is set to 10 mm.

  In this embodiment, the notch 15 and the fastener 16 are formed in the packaging container. The notch 15 is formed in a region where each surface tear guiding portion 20 and the left edge portion 11 intersect and a region where each surface tear guiding portion 20 and the right edge portion 12 intersect. Each notch 15 is formed at a position where the top of the notch 15 coincides with the center surface tear guiding portion 23. However, it is more preferable that the top portion of the notch 15 is set between the outermost surface tear guiding portion 21 and the second surface tear guiding portion 22. As shown in FIG. 1, the fastener 16 is formed between each surface tear guiding portion 20 and the center O. A dimension H2 from the center surface tear guiding portion 23 to the upper end of the fastener 16 is set to 9 mm.

  Each surface switching induction part 30 is a part which induces tearing of the surface sheet 10. The surface switching guiding portion 30 is also formed by laser light irradiation (so-called half-cut processing). Each surface switching guiding portion 30 is directed from the left edge portion 11 to the right edge portion 12, and tearing along a specific surface tear guiding portion 20 among the plurality of surface tear guiding portions 20 is performed by the plurality of surface tear guiding portions 20. Among these, the specific surface tear induction part 20 and the other surface tear induction part 20 are switched so as to be switched along the other surface tear induction part 20 formed at a position closer to the center O than the specific surface tear induction part 20. The surface tear guide 20 is connected. Specifically, each surface switching guiding portion 30 is shaped so as to gradually approach the other surface tear guiding portion 20 from the specific surface tear guiding portion 20 as it approaches the vertical bisector L from the left edge portion 11. Is formed.

  As shown in FIG. 2, in the present embodiment, the plurality of surface switching induction units 30 include five (5) surface switching induction units 30, that is, an upper surface switching induction unit 31 and a first middle surface switching unit. It has a guiding part 32, a second middle surface switching guiding part 33, a first lower surface switching guiding part 34, and a second lower surface switching guiding part 35. However, the number of surface switching induction parts is not limited to this.

  The upper surface switching guide 31 connects the outermost surface tear guide 21 and the second surface tear guide 22. The intersection of the upper surface switching guide part 31 and the outermost surface tear guide part 21 is set so as to be located on the surface straight part 26 in the outermost surface tear guide part 21. An intersection between the upper surface switching guiding portion 31 and the second surface tear guiding portion 22 is set so as to be positioned on the surface inwardly curved portion 27 in the second surface tear guiding portion 22.

  The first middle stage surface switching induction part 32 connects the second surface tear induction part 22 and the central surface tear induction part 23. The intersection of the first middle surface switching induction part 32 and the second surface tear induction part 22 is set so as to be located on the surface straight line part 26 of the second surface tear induction part 22. The intersection of the first middle stage surface switching guiding portion 32 and the central surface tear guiding portion 23 is set so as to be positioned on the surface inward curved portion 27 of the central surface tear guiding portion 23. The curvature radius of the first middle stage surface switching guiding portion 32 is set to 20 mm.

  The second middle surface switching guide 33 is a portion of the second surface tear guide 22 that is closer to the right edge 12 than the intersection of the second surface tear guide 22 and the first middle surface switching guide 32. Of the central surface tear guiding portion 23, a portion closer to the right edge portion 12 than the intersection of the central surface tear guiding portion 23 and the first middle surface switching guiding portion 32 is connected. Hereinafter, in the relationship between the first middle stage surface switching guidance part 32 and the second middle stage surface switching guidance part 33, the first middle stage surface switching guidance part 32 is referred to as a “first surface switching guidance part”, and the second middle stage surface switching guidance part 32. The guiding portion 33 is referred to as a “second surface switching guiding portion”. The intersection of the second middle surface switching guiding portion 33 and the second surface tear guiding portion 22 is set so as to be located on the surface inwardly curved portion 27 of the second surface tear guiding portion 22. The intersection of the second middle surface switching guiding portion 33 and the central surface tear guiding portion 23 is set so as to be located on the surface inwardly curved portion 27 of the central surface tear guiding portion 23.

  The first lower surface switching induction portion 34 connects the central surface tear induction portion 23 and the fourth surface tear induction portion 24. The intersection of the first lower surface switching guide 34 and the center surface tear guide 23 is set so as to be located on the surface straight portion 26 of the center surface tear guide 23. The intersection of the first lower surface switching induction portion 34 and the fourth surface tear induction portion 24 is set to be located on the surface inward bending portion 27 of the fourth surface tear induction portion 24. The curvature radius of the first lower surface switching guide 34 is set to 20 mm.

  The second lower surface switching inducing portion 35 includes a portion of the central surface tear inducing portion 23 that is closer to the right edge 12 than the intersection of the central surface tear inducing portion 23 and the first lower surface switching inducing portion 34, and a fourth Of the surface tear guiding portion 24, a portion closer to the right edge portion 12 than the intersection of the fourth surface tear guiding portion 24 and the first lower surface switching guiding portion 34 is connected. Hereinafter, in the relationship between the first lower surface switching guidance part 34 and the second lower surface switching guidance part 35, the first lower surface switching guidance part 34 is referred to as a “first surface switching guidance part”, and the second lower surface switching guidance part 34. The guiding part 35 is referred to as a “second surface switching guiding part”. The intersection of the second lower surface switching guide 35 and the center surface tear guide 23 is set so as to be positioned on the surface inwardly curved portion 27 of the center surface tear guide 23. The intersection of the second lower surface switching guide part 35 and the fourth surface tear guide part 24 is set so as to be positioned on the surface outward curved part 28 in the fourth surface tear guide part 24.

  As shown in FIG. 2, the upper surface switching guidance part 31, the second middle surface switching guidance part 33, and the second lower surface switching guidance part 35 have a continuously connected shape. The radii of curvature of the upper surface switching guidance part 31, the second middle surface switching guidance part 33, and the second lower surface switching guidance part 35 are set to 55 mm.

  In the present embodiment, the surface tear region 20 </ b> S in which the plurality of surface tear induction portions 20 are formed in the surface sheet 10 includes the innermost surface tear induction portion 25 and the innermost surface tear induction portion among the plurality of surface tear induction portions 20. It has a surface blocking region 22S formed between the surface tear guiding portion 20 located on the outer side of the surface sheet 10 with respect to the portion 25. The surface blocking region 22 </ b> S has a shape that is continuously connected so as to reach the right edge 12 from the left edge 11 without being divided by the respective surface switching guides 30. That is, in the present embodiment, the surface blocking region 22S corresponds to a region between the fourth surface tear guiding portion 24 and the innermost surface tear guiding portion 25 in the surface tearing region 20S.

  Next, referring to FIG. 3, the tearing force F when tearing each sheet, the first surface switching guiding part (first middle surface switching guiding part 32, first lower surface switching guiding part 34) and the above The relationship between the shape (angle) of the second surface switching guiding part (second middle surface switching guiding part 33, second lower surface switching guiding part 35) will be described. Here, when each sheet is torn from the left edge portion 11 toward the right edge portion 12, the tear force F is generally in the same direction and substantially the same size from the left edge portion 11 to the right edge portion 12. Each sheet is torn. That is, the direction and magnitude of the tearing force F often changes substantially constant while each sheet is torn.

  As shown in FIG. 3, the direction of the tearing force F of each sheet, and the second middle stage at the intersection of the second middle stage surface switching guiding part (second surface switching guiding part) 33 and the second surface tear guiding part 22. The angle θ33 formed by the second surface inclination of the surface switching guiding portion 33 depends on the direction of the tear force F, the first middle surface switching guiding portion (first surface switching guiding portion) 32, and the second surface tear guiding portion 22. Is larger than the angle θ32 formed by the first surface inclination of the first middle surface switching guide 32 at the intersection with the first surface. For this reason, the component F33 in the direction orthogonal to the surface second inclination of the tear force F, that is, the component in the direction away from the second surface tear guiding portion 22 (toward the central surface tear guiding portion 23), The force F is larger than the component F32 in the direction orthogonal to the surface first inclination. Similarly, the direction of the tear force F and the surface of the second lower surface switching guide 35 at the intersection of the second lower surface switching guide 35 (second surface switching guide) 35 and the central surface tear guide 23. The angle θ35 formed by the two inclinations is the direction of the tearing force F and the first lower surface at the intersection of the first lower surface switching induction portion (first surface switching induction portion) 34 and the central surface tear induction portion 23. It is larger than the angle θ34 formed by the first surface inclination of the switching guiding portion 34. For this reason, the component F35 in the direction orthogonal to the second surface inclination of the tear force F, that is, the component in the direction away from the center surface tear guiding portion 23 (toward the fourth surface tear guiding portion 24), The force F is larger than the component F34 in the direction orthogonal to the first surface inclination.

  Here, the tear force F includes a component parallel to a surface reference straight line S (see FIG. 1) connecting the intersection of the left edge portion 11 and the surface tear guide portion 20 and the center O. That is, in the present embodiment, the second surface angle formed by the surface reference straight line S and the second surface inclination is larger than the first surface angle formed by the surface reference straight line S and the second surface inclination. In addition, the shape of each surface tear guiding portion 20 and each surface switching guiding portion 30 is set.

  Then, the manufacturing method of this packaging container is demonstrated. This manufacturing method includes a sheet preparation process, a front surface induction part forming process, a back surface induction part forming process, and a sheet bonding process.

  In the sheet preparation step, a sheet in which the upper end of the top sheet 10 and the upper end of the back sheet are connected to each other (the top sheet 10 and the back sheet are connected to each other so as to sandwich the boundary between the top end of the top sheet 10 and the top end of the back sheet) Prepared sheet).

  The surface guide portion forming step is a step of forming each surface tear guide portion 20 and each surface switching guide portion 30 on the top sheet 10 with a laser.

  A back surface induction | guidance | derivation part formation process is a process of forming each back surface tear induction | guidance | derivation part and each back surface switching induction | guidance | derivation part with a laser in a back surface sheet. This back surface induction part formation process may be performed after the surface induction part formation process, and may be performed simultaneously with the surface induction part formation process.

  In the sheet joining step, after the sheet is folded along the boundary between the upper end of the top sheet 10 and the upper end of the back sheet, that is, over the entire region from the left edge portion 11 to the right edge portion 12, After folding the sheet so that each back surface tear guide part overlaps each other in the thickness direction of each sheet, the left edge parts, the right edge parts, the upper edge parts, and the lower edge parts, It is a process of joining by heating. In this step, due to the tolerance of the device for folding the sheet, the region between the front surface tear guide portions 20 and the back surface tear guide portions are formed over the entire region from the left edge portion 11 to the right edge portion 12. The sheets may be folded so as to overlap each other in the thickness direction.

  Next, the process of opening this packaging container is demonstrated. Below, the surface sheet 10 is positioned in front, and a portion of the packaging container that is outside the front surface tear guiding portion 20 and the back surface tear guiding portion (hereinafter referred to as “removed portion”) is the packaging container. Each sheet is pulled to the front and lower side with respect to a portion (hereinafter referred to as “main body portion”) on the inner side (the side closer to the center of each sheet) than each front surface tear guiding portion 20 and each back surface tear guiding portion. An example of tearing will be described.

  For example, the tearing force F is applied so that the body portion is grasped with the left hand and the portion to be excised is pulled downward and forward while the portion to be excised is picked with the right hand. Then, starting from the notch 15, both sheets are torn along the respective guiding portions from the left edge portion 11 to the right edge portion 12 (the cut portion is cut from the packaging container), thereby opening the packaging container. Part is formed. Since the opening (the upper end of the main body) is formed in a shape that bulges outward, that is, a knob is formed in the opening, so that the opening can be easily formed.

  Furthermore, when both sheets are torn, even when the tearing of each sheet is started along the front surface tear guiding portion 20 and the back surface tear guiding portion formed at positions shifted from each other in the thickness direction of each sheet. The occurrence of poor tearing is suppressed. This point will be described with reference to the example shown in FIG. FIG. 4 shows that the regions between the front surface tear guide portions 20 and the back surface tear guide portions overlap each other in the thickness direction of each sheet, and the front surface tear guide portions 20 are located outside the back surface tear guide portions. It is an enlarged view of the state where both sheets were joined so as to. As shown in FIG. 4, tearing of each sheet was started along the second front surface tear guiding portion 22 and the second back surface tear guiding portion 22 ′ formed at positions shifted from each other in the thickness direction of each sheet. At the beginning of tearing, the lower end portion of the back sheet outside the second back surface tear guiding portion 22 ′ interferes with the upper end portion of the surface sheet 10 inside the second surface tear guiding portion 22. However, in the middle of the tearing, the topsheet 10 passes through the first middle surface switching guide part 32 to be inside the second surface tearing guide part 22 from the tearing along the second surface tearing guide part 22. It is switched to the tearing along the central surface tearing induction portion 23 formed in the above. For this reason, interference of both sheets during tearing after passing through the first middle stage surface switching guiding portion 32 is avoided. This is because tearing of each sheet is started along the outermost surface tear guiding portion 21 and the outermost back surface tear guiding portion, or along the central surface tear guiding portion 23 and the central back surface tear guiding portion 23 '. The same applies to the case of the case. In addition, when the surface sheet 10 is positioned in front and each sheet is torn so as to push the portion to be cut to the lower side with respect to the main body portion, the specific surface tear guiding portion 20 and When tearing of each sheet is started along a specific back surface tear guiding portion formed outside (for example, along the center surface tear guiding portion 23 and the second back surface tear guiding portion 22 ') The same applies to. Therefore, the occurrence of poor tearing is suppressed.

  Further, in the present embodiment, the second middle surface switching guidance is provided at a position on the right side of the second surface tear guiding portion 22 with respect to the connecting portion between the second surface tear guiding portion 22 and the first middle surface switching guiding portion 32. Since the part 33 is connected, generation | occurrence | production of the tearing defect is suppressed more reliably. Specifically, compared with the case where only a single surface switching induction portion is formed with respect to the second surface tear induction portion 22, the second surface tear induction portion 22 to the central surface tear induction portion 23 during the tearing. Is more reliably switched.

  Furthermore, in this embodiment, when the surface second angle is larger than the surface first angle, the component F33 in the direction orthogonal to the surface second inclination of the tear force F, that is, the second surface tear induction portion. The component in the direction away from 22 (towards the central surface tear guiding portion 23) is larger than the component F32 in the direction perpendicular to the first surface inclination of the tear force F. For this reason, even if it is a case where switching via the 1st middle stage surface switching induction | guidance | derivation part 32 was not made during the tearing along the 2nd surface tear induction | guidance | derivation part 22, after that, via the 2nd middle stage surface switching induction | guidance | derivation part 33 This makes it easier to switch. The same applies to the back side. Therefore, the occurrence of defective tears is more reliably suppressed.

  Moreover, in this embodiment, since the surface tear area | region 20S has the surface inhibition area | region 22S and a back surface tear area | region has a back surface inhibition area | region, the area | region and back surface inside the innermost surface tear induction | guidance | derivation part 25 among the surface sheets 10 It is suppressed that each sheet is torn in a region on the inner side of the innermost back surface tear guiding portion of the sheet. Temporarily, tearing force F was large, and each sheet was torn to the inner side so as to cross each blocking region from the tear guide part located outside the innermost surface tear guide part 25 and the innermost back surface tear guide part. Even then, each sheet is guided to be torn along the innermost surface tear guiding portion 25 and the innermost back surface tear guiding portion. Therefore, the tearing of each sheet is effectively suppressed in a region inside the innermost surface tear guiding portion 25 and a region inside the innermost back surface tear guiding portion (region where tearing is not scheduled).

  In addition, in the present embodiment, each guiding portion formed on the top sheet 10 and each guiding portion formed on the back sheet has a symmetrical shape with the perpendicular bisector L as the symmetry axis. Therefore, it is effective both when starting the tearing of each sheet from the left edge part 11 toward the right edge part 12 and when starting the tearing of each sheet from the right edge part 12 toward the left edge part 11. In addition, the occurrence of poor tearing is suppressed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of the claims, and includes all modifications within the meaning and scope equivalent to the scope of the claims.

  For example, each surface tear guide portion 20 is not limited to a shape extending from the left edge portion 11 to the right edge portion 12, but has a shape extending from the left edge portion 11 to the upper edge portion 13. Also good.

  In addition, the number of the plurality of surface tear guiding portions 20 can be set to 2 or more and 15 or less. When the number is 2, the surface blocking region 22S is omitted.

  Further, the surface inwardly curved portion 27 may be omitted. That is, the surface straight part 26 and the surface outward curved part 28 may be directly connected. Alternatively, both the surface straight portion 26 and the surface inward curved portion 27 may be omitted. That is, each surface tear guide line 20 may have a shape that gradually curves outward and convex outward as it goes from the left edge 11 toward the vertical bisector L. This is the same for each back surface tear guide line.

  The packaging container may be a so-called standing pouch. That is, the bottom sheet may be bonded to the bottom of each of the top sheet 10 and the back sheet.

  Further, each guiding portion may be formed by a blade instead of laser light irradiation. Each guide part may be formed in a perforation.

DESCRIPTION OF SYMBOLS 10 Surface sheet 11 Left edge part 12 Right edge part 13 Upper edge part 14 Lower edge part 20 Surface tear induction part 20S Surface tear area | region 22S Surface inhibition area | region 21 Outermost surface tear induction part 22 2nd surface tear induction part 23 Central surface tear Guide part 24 Fourth surface tear guide part 25 Innermost surface tear guide part 26 Surface straight part 27 Surface inward curved part 28 Surface outward curved part 30 Surface switching guide part 31 Upper stage surface switching guidance part 32 First middle stage surface switching guidance Part (first surface switching induction part)
33 2nd middle surface switching guidance part (2nd surface switching guidance part)
34 1st lower surface switching guidance part (1st surface switching guidance part)
35 Second lower surface switching guiding portion (second surface switching guiding portion)
F Tear force S Surface reference straight line

Claims (5)

A packaging container joined so that the top sheet and the back sheet face each other,
The surface sheet has a shape that extends from a specific edge of the surface sheet to another edge and is spaced apart from each other, and a plurality of surface tear inductions that induce tearing of the surface sheet Part is formed,
The back sheet has a shape that extends from a specific edge of the back sheet to another edge and is spaced apart from each other, and a plurality of back surface tear inductions that induce tearing of the back sheet Part is formed,
The topsheet and the backsheet are such that each front tear guide and each back tear guide overlap each other in the thickness direction of each sheet, or a region between each front tear guide and each back tear guide Are joined so as to overlap each other in the thickness direction of each sheet,
Each surface tear guide portion has a surface outward curved portion having a shape that curves so as to be convex toward the outside of the surface sheet with respect to the center of the surface sheet,
Each back surface tear guide portion has a back surface outward curved portion having a shape that curves toward the outside of the back surface sheet with respect to the center of the back surface sheet,
In the surface sheet, tearing along the specific surface tear induction portion among the plurality of surface tear induction portions and from the specific edge portion toward the other edge portion is included in the plurality of surface tear induction portions. The specific surface tear induction part and the other surface tear induction part are switched to tearing along another surface tear induction part formed at a position closer to the center of the surface sheet than the specific surface tear induction part. And at least one surface switching induction portion for inducing tearing of the surface sheet is formed.
In the back sheet, tearing along the specific back surface tear guiding portion among the plurality of back surface tear guiding portions and from the specific edge portion toward the other edge portion is included in the plurality of back surface tear guiding portions. The specific back surface tear induction part and the other back surface tear induction so that the switching can be made to tear along another back surface tear induction part formed at a position closer to the center of the back surface sheet than the specific back surface tear induction part. The packaging container in which the at least 1 back surface switching induction | guidance | derivation part which guides tearing of the said back surface sheet is formed. The packaging container according to claim 1,
The at least one surface switching guiding portion is
A first surface switching induction portion that connects the specific surface tear induction portion and the other surface tear induction portion;
Of the specific surface tear induction portion, a portion closer to the other edge of the surface sheet than an intersection of the specific surface tear induction portion and the first surface switching induction portion, and the other surface tear induction portion A second surface switching induction portion that connects a portion closer to the other edge of the surface sheet than an intersection of the other surface tear induction portion and the first surface switching induction portion. ,
The at least one back surface switching guiding portion is
A first back surface switching induction portion that connects the specific back surface tear induction portion and the other back surface tear induction portion;
Of the specific back surface tear guiding portion, a portion closer to the other edge of the back sheet than an intersection of the specific back surface tear guiding portion and the first back surface switching guiding portion, and the other back surface tear guiding portion A second back surface switching induction portion that connects a portion closer to the other edge portion of the back surface sheet than an intersection of the other back surface tear induction portion and the first back surface switching induction portion, Packaging container. The packaging container according to claim 2,
A surface reference straight line parallel to a line segment connecting the intersection of the specific edge of the surface sheet and the surface tear induction part and the center of the surface sheet, the second surface switching induction part, and the specific surface tear The surface second angle formed by the surface second inclination of the second surface switching guiding portion at the intersection with the guiding portion is the surface reference straight line, the first surface switching guiding portion, and the specific surface tear guiding portion. Is greater than the first surface angle formed by the first surface inclination of the first surface switching guiding portion at the intersection of
A back surface reference straight line parallel to a line connecting the intersection between the specific edge of the back sheet and the back surface tear guiding portion and the center of the back surface sheet, the second back surface switching guiding portion, and the specific back surface tearing The back surface second angle formed by the back surface second inclination of the second back surface switching guiding portion at the intersection with the guiding portion is the back surface reference straight line, the first back surface switching guiding portion, and the specific back surface tearing guiding portion. A packaging container that is larger than the first back surface angle formed by the back surface first inclination of the first back surface switching guiding portion at the intersection of In the packaging container according to any one of claims 1 to 3,
The surface tear region in which the plurality of surface tear induction portions are formed in the surface sheet includes an innermost surface tear induction portion formed at a position closest to the center of the surface sheet among the plurality of surface tear induction portions. A surface-blocking region formed between the surface-tear-inducing portion and the surface-tear-inducing portion located outside the surface sheet from the innermost surface-tear-inducing portion. Has a shape that is continuously connected so as to reach the other edge from the specific edge of the surface sheet without being divided by the surface switching induction part,
The back surface tear region in which the plurality of back surface tear guiding portions are formed in the back surface sheet is an innermost back surface tear guiding portion formed at a position closest to the center of the back surface sheet among the plurality of back surface tear guiding portions. A back-surface blocking region formed between the back-surface tear-inducing portion and the back-surface tear-inducing portion positioned outside the back-surface sheet with respect to the innermost back-surface tear-inducing portion. Is a packaging container having a shape continuously connected so as to reach the other edge from the specific edge of the back sheet without being divided by the back surface switching guiding part. The packaging container according to any one of claims 1 to 4,
Each surface tear guiding portion and the at least one surface switching guiding portion are symmetrical with respect to a perpendicular bisector connecting a line segment connecting the specific edge portion and the other edge portion of the surface sheet. Have
Each of the back surface tear guide portions and the at least one back surface switching guide portion are symmetrical with respect to a vertical bisector connecting a line segment connecting the specific edge portion and the other edge portion of the back surface sheet. Having a packaging container.

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