Lid material and container with lid

Abstract

To improve the reliability of opening.SOLUTION: A lid body 33 of a lid material 3 has: a first full cutting line 40; a back half cutting line 60; and a front half cutting line 70. The back half cutting line 60 has: a back half cutting main line 61 extending along the outer periphery of the lid body 33; and a first back half cutting guide line 63 extending from the vicinity of the first full cutting line 40 and connected to the back half cutting main line 61. The front half cutting line 70 has a first front half cutting line portion 71 extending from the vicinity of the tip 40b of the first full cutting line 40 on the opposite side to a gripping portion 34. A tip 40b of the first full cutting line 40 is located on the opposite side of the gripping portion 34 with respect to a first reference line L1 that passes through a first connection point 61c where the back half cutting main line 61 and the first back half cutting guide line 63 are connected and is inclined at 45° in a direction away from the gripping portion 34 with respect to a protruding direction D5 of the gripping portion 34.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a lid material that is joined to a flange formed around the periphery of the opening of a container, and to a lidded container to which the lid material is joined. [Background technology]

[0002] Patent Document 1 describes a container with a lid in which a lid is sealed to a flange on the periphery of a rectangular container opening. The lid described in Patent Document 1 includes a tab (opening tab) that is provided at a position corresponding to a corner of the rectangular container opening and opens the lid, a front half-cut line (front half-cut line) that cuts the front layer, a back half-cut line (back half-cut line and auxiliary half-cut line) that cuts the back layer, and a pair of full cut lines (score lines) that cut the lid on both sides of the tab. The front half-cut lines extend from the respective tips of the pair of full cut lines and go around the rectangular container opening except for the corners where the tabs are provided. The back half-cut lines extend from the respective middles of the pair of full cut lines and go around the rectangular container opening. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-095168 A Summary of the Invention [Problem to be solved by the invention]

[0004] The full cut line, the front half cut line, and the back half cut line are simultaneously formed by a blade such as a Thomson blade. However, since the cutting edge of the blade for forming the full cut line, the cutting edge of the blade for forming the front half cut line, and the cutting edge of the blade for forming the back half cut line cannot be continuously connected without interruption, these cutting edges are separated from each other. For this reason, in the container with a lid described in Patent Document 1, the front half cut line is not connected to each tip of the pair of full cut lines, but extends from the vicinity of each tip of the pair of full cut lines, and the back half cut line is not connected to each midway of the pair of full cut lines, but extends from the vicinity of each midway of the pair of full cut lines. Note that the vicinity refers to a nearby, separated position.

[0005] In the container with lid described in Patent Document 1, when the handle is pulled to open the container, the lid is delaminated between the full cut line and the back half cut line. Then, the breakage of the lid progresses from the tip of the full cut line to the front half cut line, and the lid is delaminated between the front half cut line and the back half cut line, thereby opening the lid. However, if the tip of the front half cut line is located closer to the surface of the lid than the tip of the back half cut line, the breakage of the lid progresses from the tip of the full cut line to the front half cut line, and the peeled surface may move closer to the surface of the lid than the back half cut line. As a result, there are cases where the peeled surface progresses to the inside of the lid, resulting in defective opening.

[0006] Therefore, an object of the present invention is to provide a lid material and a lidded container that can improve the reliability of opening. [Means for solving the problem]

[0007] [1] The lid material of the present invention is a sheet-like lid material for being joined to a flange of a container having an opening and a flange extending from the opening to close the opening, the sheet-like lid material comprising: a lid body joined to the flange to close the opening, and a knob portion protruding from the lid body, the lid body having a first full cut line extending from the knob portion, a back half-cut line formed on the back surface of the lid body, and a front half-cut line formed on the front surface of the lid body, the back half-cut line having a main back half-cut line extending along the outer periphery of the lid body and a first back half-cut guide line extending from near the first full cut line and connected to the main back half-cut line, the front half-cut line having a first front half-cut line portion extending from near the tip of the first full cut line opposite the knob portion, and the tip of the first full cut line is located on the opposite side of the knob portion with respect to a first reference line that passes through a first connection point where the main back half-cut line and the first back half-cut guide line are connected and that is inclined at 45° away from the knob portion with respect to the protruding direction of the knob portion.

[0008] In this lid material, the lid body has a first full cut line extending from the gripping portion, a back half cut line formed on the back surface of the lid body, and a front half cut line formed on the front surface of the lid body, the back half cut line has a main back half cut line extending along the outer periphery of the lid body, and a first back half cut guide line extending from the vicinity of the first full cut line and connected to the main back half cut line, and the front half cut line has a first front half cut line portion extending from the vicinity of the tip of the first full cut line on the opposite side to the gripping portion. Therefore, when an attempt is made to open the lid material by pulling the gripping portion, the lid body is delaminated between the first full cut line and the first back half cut guide line. The peeling surface of the delamination progresses from the first full cut line to the first front half cut line portion and from the first back half cut guide line to the main back half cut line. As a result, the lid body is delaminated between the front half cut line and the main back half cut line, and the lid material is opened.

[0009] Moreover, in this lid material, the tip of the first full cut line is located on the opposite side of the tab with respect to the first reference line that passes through the first connection point where the back half cut main line and the first back half cut guide line are connected and is inclined at 45 degrees away from the tab with respect to the protruding direction of the tab. Therefore, the interlayer peeling is likely to progress to a position farther away than the first connection point of the back half cut main line before progressing to the tip of the first full cut line. Therefore, even if the peeling surface moves toward the front side of the lid material from the back half cut main line as a result of the breakage of the lid body progressing from the tip of the first full cut line to the first front half cut line, a force acts to lift the part surrounded by the back half cut main line from the back side of the lid material, making it easier to tear off the part between the peeling surface and the back half cut main line. This improves the reliability of opening.

[0010] [2] In the lid material described in [1], the lid body has a second full cut line extending from the gripping portion, the back half cut line has a second back half cut guide line extending from near the second full cut line and connected to the back half cut main line, the front half cut line has a second front half cut line portion extending from near the tip of the second full cut line on the opposite side to the gripping portion, and the tip of the second full cut line passes through a second connection point where the back half cut main line and the second back half cut guide line connect and may be located on the opposite side of the gripping portion with respect to a second reference line that is inclined at 45° in a direction away from the gripping portion with respect to the protruding direction of the gripping portion.

[0011] In this lid material, the lid body has a second full cut line extending from the gripping portion, the back half cut line has a second back half cut guide line extending from the vicinity of the second full cut line and connected to the back half cut main line, and the front half cut line has a second front half cut line portion extending from the vicinity of the tip of the second full cut line on the opposite side to the gripping portion. Therefore, when an attempt is made to open the lid material by pulling the gripping portion, the lid body is delaminated between the second full cut line and the second back half cut guide line. The peeling surface of the delamination progresses from the second full cut line to the second front half cut line portion and from the second back half cut guide line to the back half cut main line. As a result, the lid body is delaminated between the front half cut line and the back half cut main line, and the lid material is opened.

[0012] Moreover, in this lid material, the tip of the second full cut line is located on the opposite side of the tab with respect to the second reference line that passes through the second connection point where the back half cut main line and the second back half cut guide line are connected and is inclined at 45 degrees away from the tab with respect to the protruding direction of the tab. Therefore, the interlayer peeling is likely to progress to a position farther away than the second connection point of the back half cut main line before progressing to the tip of the second full cut line. Therefore, even if the peeling surface moves toward the front side of the lid material from the back half cut main line as the breakage of the lid body progresses from the tip of the second full cut line to the second front half cut line, a force acts to lift the part surrounded by the back half cut main line from the back side of the lid material, making it easier to tear off the part between the peeling surface and the back half cut main line. This improves the reliability of opening.

[0013] [3] The lid material of the present invention is a sheet-like lid material for being joined to a flange of a container having a rectangular opening and a flange extending from the opening to close the opening, the sheet-like lid material comprising: a rectangular lid body joined to the flange to close the opening, and a knob portion located at a corner of the lid body and protruding from the lid body, the lid body having a first full cut line extending from the knob portion, a back half-cut line formed on the back surface of the lid body, and a front half-cut line formed on the front surface of the lid body, the back half-cut line having a main back half-cut line extending along the outer periphery of the lid body and a first back half-cut guide line extending from near the first full cut line and connected to the main back half-cut line, the front half-cut line having a first front half-cut line portion extending from near the tip of the first full cut line opposite the knob portion, and the tip of the first full cut line being located on the opposite side of the knob portion with respect to a first reference line extending in the long side direction of the lid body through a first connection point where the main back half-cut line and the first back half-cut guide line are connected.

[0014] In this lid material, the lid body has a first full cut line extending from the gripping portion, a back half cut line formed on the back surface of the lid body, and a front half cut line formed on the front surface of the lid body, the back half cut line has a main back half cut line extending along the outer periphery of the lid body, and a first back half cut guide line extending from the vicinity of the first full cut line and connected to the main back half cut line, and the front half cut line has a first front half cut line portion extending from the vicinity of the tip of the first full cut line on the opposite side to the gripping portion. Therefore, when an attempt is made to open the lid material by pulling the gripping portion, the lid body is delaminated between the first full cut line and the first back half cut guide line. The peeling surface of the delamination progresses from the first full cut line to the first front half cut line portion and from the first back half cut guide line to the main back half cut line. As a result, the lid body is delaminated between the front half cut line and the main back half cut line, and the lid material is opened.

[0015] Moreover, in this lid material, the tip of the first full cut line is located on the opposite side of the gripping portion with respect to the first reference line that passes through the first connection point where the back half cut main line and the first back half cut guide line are connected and extends in the long side direction of the lid body. Therefore, the interlayer peeling is likely to progress to a position farther away than the first connection point of the back half cut main line before progressing to the tip of the first full cut line. Therefore, even if the peeling surface moves toward the front side of the lid material from the back half cut main line as the breakage of the lid body progresses from the tip of the first full cut line to the first front half cut line, a force acts to lift the part surrounded by the back half cut main line from the back side of the lid material, making it easier to tear off the part between the peeling surface and the back half cut main line. This improves the reliability of opening.

[0016] [4] In the lid material described in [3], the lid body has a second full cut line extending from the gripping portion, the back half cut line has a second back half cut guide line extending from near the second full cut line and connected to the back half cut main line, the front half cut line has a second front half cut line portion extending from near the tip of the second full cut line opposite the gripping portion, and the tip of the second full cut line may be located on the opposite side of the gripping portion with respect to a second reference line extending in the short side direction of the lid body through a second connection point where the back half cut main line and the second back half cut guide line are connected.

[0017] In this lid material, the lid body has a second full cut line extending from the gripping portion, the back half cut line has a second back half cut guide line extending from the vicinity of the second full cut line and connected to the back half cut main line, and the front half cut line has a second front half cut line portion extending from the vicinity of the tip of the second full cut line on the opposite side to the gripping portion. Therefore, when an attempt is made to open the lid material by pulling the gripping portion, the lid body is delaminated between the second full cut line and the second back half cut guide line. The peeling surface of the delamination progresses from the second full cut line to the second front half cut line portion and from the second back half cut guide line to the back half cut main line. As a result, the lid body is delaminated between the front half cut line and the back half cut main line, and the lid material is opened.

[0018] Moreover, in this lid material, the tip of the second full cut line is located on the opposite side of the gripping portion with respect to the second reference line that passes through the second connection point where the back half cut main line and the second back half cut guide line are connected and extends in the short side direction of the lid body. Therefore, the interlayer peeling is likely to progress to a position farther away than the second connection point of the back half cut main line before progressing to the tip of the second full cut line. Therefore, even if the break progresses from the tip of the second full cut line to the second front half cut line portion and the peeling surface moves toward the front side of the lid material from the back half cut main line, a force acts to lift the part surrounded by the back half cut main line from the back side of the lid material, making it easier to tear off the part between the peeling surface and the back half cut main line. This improves the reliability of opening.

[0019] [5] In the lid material described in [2] or [4], the first slit line may have a first straight line portion extending in a straight line to the tip of the first slit line, and the second slit line may have a second straight line portion extending in a straight line to the tip of the second slit line, and the first straight line portion and the second straight line portion may extend in a direction opposite to the protruding direction of the gripping portion, so that the first straight line portion extending in a straight line to the tip of the first slit line and the second straight line portion extending in a straight line to the tip of the second slit line extend in a direction opposite to the protruding direction of the gripping portion, so that a triangle is formed by the straight line passing through the first connection point and the second connection point, the straight line passing through the first straight line portion, and the straight line passing through the second straight line portion. As a result, when the gripping portion is lifted, the lid body is easily bent on the straight line passing through the first connection point and the second connection point, so that the gripping portion can be easily lifted.

[0020] [6] In the lid according to any one of [2], [4] and [5], when a straight line passing through the tip of the first total cut line and the tip of the second total cut line is defined as a total cut line tip reference line, and a straight line passing through the first connection point and the second connection point is defined as a connection point reference line, the inclination angle of the total cut line tip reference line relative to the connection point reference line may be 10° or less. In this lid, since the inclination angle of the total cut line tip reference line relative to the connection point reference line is 10° or less, when the gripping portion is lifted, the lid body is easily bent on the connection point reference line. This makes it easier to lift the gripping portion, and the lid can be easily opened.

[0021] [7] In the lid material described in [6], the first and second connection points may be located on the opposite side of the tab with respect to the reference line for the tip of the full cut line. In this lid material, when an attempt is made to open the lid by pulling the tab, the resistance to opening the lid material increases at the tip of the first and second full cut lines, and the lid body bends at the reference line for the tip of the full cut line. Since the first and second connection points are located on the opposite side of the tab with respect to the reference line for the tip of the full cut line, the lid body can be smoothly broken from the tip of the first and second full cut lines to the main line for the back half cut.

[0022] [8] In the lid material according to any one of [1] to [7], the lid body may have a flange arrangement portion arranged on the flange, and an opening arrangement portion located inside the flange arrangement portion and arranged closer to the opening than the flange, and the front half-cut line may be formed on the flange arrangement portion, and the back half-cut main line may be formed on the opening arrangement portion. In this lid material, the front half-cut line is formed on the flange arrangement portion arranged on the flange, and the back half-cut main line is formed on the opening arrangement portion arranged closer to the opening than the flange. Therefore, when the peeling surface advances to a position farther away than the first connection point of the back half-cut main line, a force that tries to lift the part surrounded by the back half-cut main line from the back side of the lid material is easily applied. This makes it easier for the part between the peeling surface and the back half-cut main line to be torn off.

[0023] [9] A container with lid according to the present invention comprises a container having an opening and a flange formed around the opening, and the lid according to any one of [1] to [8], wherein the lid is joined to the flange to close the opening. In this container with lid, any one of the lids described above is joined to the flange to close the opening, thereby improving the reliability of opening the container. Effect of the Invention

[0024] According to the present invention, the reliability of opening can be improved. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a plan view showing a container with a lid according to an embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view taken along line II-II shown in FIG. [Diagram 3] FIG. 3 is a schematic cross-sectional view showing an enlarged portion of the lid. [Figure 4] FIG. 4 is an enlarged plan view of a portion of the covering material according to the embodiment. [Diagram 5] FIG. 5 is an enlarged plan view of a portion of the covering material according to the embodiment. [Figure 6]FIG. 6 is an enlarged plan view of a portion of the lid according to the embodiment. [Figure 7] FIG. 7 is a schematic end view taken along line VII-VII shown in FIG. [Figure 8] FIG. 8 is a schematic end view corresponding to FIG. 7, showing a state in which the covering material has been delaminated. [Figure 9] FIG. 9 is a schematic end view taken along line IX-IX shown in FIG. [Figure 10] FIG. 10 is a schematic end view corresponding to FIG. 9, showing a state in which the covering material has been delaminated. [Figure 11] FIG. 11 is a schematic end view taken along line XI-XI shown in FIG. [Figure 12] FIG. 12 is a schematic end view corresponding to FIG. 11, showing a state in which the covering material has been delaminated. [Figure 13] FIG. 13 is an enlarged plan view of a portion of the lid of the comparative example. [Figure 14] FIG. 14 is a schematic end view taken along line XIV-XIV shown in FIG. [Figure 15] FIG. 15 is a schematic end view corresponding to FIG. 14, showing the lid body in a delaminated state. [Figure 16] FIG. 16 is a schematic end view taken along line XVI-XVI shown in FIG. [Figure 17] FIG. 17 is a schematic end view corresponding to FIG. 16, showing the lid body in a delaminated state. [Figure 18] FIG. 18 is a schematic end view taken along line XVIII-XVIII shown in FIG. [Figure 19] FIG. 19 is a schematic end view corresponding to FIG. 18, showing the lid body in a delaminated state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are designated by the same reference numerals, and duplicated description will be omitted.

[0027] Fig. 1 is a front view showing a container with a lid according to an embodiment. Fig. 2 is a schematic cross-sectional view taken along line II-II shown in Fig. 1. As shown in Figs. 1 and 2, a container with a lid 1 according to this embodiment includes a container 2 and a lid 3.

[0028] The container 2 has a rectangular opening 21 and a flange 22 formed around the periphery of the opening 21. A rectangular shape is a shape that can be considered to be substantially rectangular, and includes, for example, a shape with rounded corners of a rectangle. The container 2 is filled with contents 23, such as food. The contents 23 can be removed from the opening 21. The flange 22 is formed in a rectangular shape similar to the opening 21.

[0029] Fig. 3 is a schematic cross-sectional view in which a part of the lid material is enlarged. As shown in Figs. 1 to 3, the lid material 3 is a sheet-like member that is joined to the flange 22 of the container 2 to close the opening 21 of the container 2. The front surface 3a of the lid material 3 is the surface exposed above the lidded container 1, and the back surface 3b of the lid material 3 is the surface that is joined to the flange 22 of the container 2. The lid material 3 is a laminate in which a sealant layer 31 and a paper base layer 32 are laminated.

[0030] The sealant layer 31 forms the back surface 3b of the lid 3 and is joined to the flange 22 of the container 2. The sealant layer 31 is joined to the flange 22 by, for example, heat sealing. The material of the sealant layer 31 is not particularly limited, and may be, for example, polypropylene (PP), polyethylene (PE), etc. From the viewpoint of heat resistance, it is preferable that the sealant layer 31 is polypropylene.

[0031] The paper base layer 32 is disposed on the surface 3a side of the sealant layer 31. The paper base layer 32 may or may not form the surface 3a. For example, another layer such as a coating layer may be disposed on the surface 3a side of the paper base layer 32, and this other layer may form the surface 3a. The paper base layer 32 may have a single-layer structure or a multi-layer structure. By forming the paper base layer 32 into a multi-layer structure, the paper base layer 32 can easily be given thickness and rigidity.

[0032] The container 2 may be a laminate of a sealant layer (not shown) and a paper base layer (not shown) similarly to the lid material 3. In this case, the lidded container 1 may be configured such that the sealant layer 31 of the lid material 3 is heat-healed to the sealant layer of the container 2.

[0033] Fig. 4 is an enlarged plan view of a portion of the lid material according to the embodiment. As shown in Figs. 1 to 4, the lid material 3 includes a lid main body 33 and a gripping portion 34. Each of the lid main body 33 and the gripping portion 34 is a laminated body in which a sealant layer 31 and a paper base layer 32 are laminated. The layering direction of the sealant layer 31 and the paper base layer 32 is referred to as the thickness direction D1 of the lid material 3.

[0034] As shown in Figs. 1 and 4, the lid body 33 is a part that is joined to the flange 22 of the container 2 to close the opening 21 of the container 2. The lid body 33 is formed in a rectangular shape so as to be joined to the flange 22 to close the opening 21. One of the four corners of the lid body 33 is called a corner portion 35. The lid body 33 has a first outer peripheral portion 36 and a second outer peripheral portion 37 that extend linearly with the corner portion 35 in between. The first outer peripheral portion 36 and the second outer peripheral portion 37 are two outer peripheral portions adjacent to each other with the corner portion 35 in between, among the four linearly extending outer peripheral portions of the lid body 33. The first outer peripheral portion 36 and the second outer peripheral portion 37 extend in directions perpendicular to each other. The first outer peripheral portion 36 extends in the short side direction D2 of the lid material 3 and forms the long side of the lid material 3, and the second outer peripheral portion 37 extends in the long side direction D3 of the lid material 3 and forms the short side of the lid material 3. The long side direction D3 of the lid material 3 is the grain direction D4 of the lid material 3. Therefore, the first outer peripheral portion 36 extends in a direction perpendicular to the grain direction D4 of the lid material 3, and the second outer peripheral portion 37 extends in the grain direction D4 of the lid material 3.

[0035] Furthermore, the lid main body 33 has a flange arrangement portion 38 that is arranged on the flange 22, and an opening arrangement portion 39 that is located inside the flange arrangement portion 38 and arranged closer to the opening 21 than the flange 22. The flange arrangement portion 38 is joined to the flange 22 in whole or in part. In other words, the flange arrangement portion 38 may have a portion that is not joined to the flange 22. The opening arrangement portion 39 does not face the flange 22. Furthermore, the opening arrangement portion 39 is not joined to the flange 22.

[0036] The tab 34 is a portion to be grasped when opening the lid 3. The tab 34 is also called an opening tab. The tab 34 is located at a corner 35 of the lid body 33. The tab 34 protrudes from the lid body 33. The direction in which the tab 34 protrudes from the lid body 33 is called the protruding direction D5, and the direction opposite to the protruding direction D5 is called the pulling direction D6. The pulling direction D6 is also the direction in which the tab 34 is pulled to open the lid 3. The protruding direction D5 and the pulling direction D6 can be, for example, a direction that is 45° (135°) with respect to the first outer peripheral portion 36 and the second outer peripheral portion 37. The imaginary line that is the boundary between the tab 34 and the lid body 33 is called the boundary imaginary line 34a.

[0037] The cover body 33 has a first full cutting line 40, a second full cutting line 50, a back half cutting line 60, and a front half cutting line 70.

[0038] The first cutting line 40 is a cutting line cut from the front surface 3a to the back surface 3b. The first cutting line 40 extends from the knob portion 34. Specifically, the first cutting line 40 extends from the tip of one side of the boundary imaginary line 34a located at the edge of the corner portion 35 of the lid main body 33. The tip of the boundary imaginary line 34a is the tip of the boundary imaginary line 34a on the first outer peripheral portion 36 side. The first cutting line 40 has a first cutting line upstream portion 41 extending from the tip of the boundary imaginary line 34a on the one side in the tensile direction D6, and a first cutting line downstream portion 42 bending from the tip of the first cutting line upstream portion 41 toward the first outer peripheral portion 36 and extending in a direction inclined with respect to the tensile direction D6. The first cutting line downstream portion 42 may extend while curving from the tip of the first cutting line upstream portion 41 and be smoothly connected to the first cutting line upstream portion 41. The tip of the first complete cutting line 40 on the side of the pinching portion 34 is referred to as the base end 40a, the tip of the first complete cutting line 40 on the side opposite the pinching portion 34 is referred to as the tip 40b, and the place where the first complete cutting line 40 bends toward the first outer peripheral portion 36 or where it starts to curve is referred to as the bending point 40c. The base end 40a is also the tip of the first complete cutting line upstream portion 41 on the side of the pinching portion 34. The tip 40b is also the tip of the first complete cutting line downstream portion 42 on the side opposite the pinching portion 34. The bending point 40c is also the point where the first complete cutting line upstream portion 41 and the first complete cutting line downstream portion 42 are connected.

[0039] The second total cutting line 50 is a total cutting line cut from the front surface 3a to the back surface 3b. The second total cutting line 50 extends from the knob portion 34. Specifically, the second total cutting line 50 extends from the tip of the other side of the boundary virtual line 34a located at the edge of the corner portion 35 of the lid main body 33. The tip of the other side of the boundary virtual line 34a is the tip of the boundary virtual line 34a on the second outer peripheral portion 37 side. The second total cutting line 50 has a second total cutting line upstream portion 51 extending from the tip of the other side of the boundary virtual line 34a in the tensile direction D6, and a second total cutting line downstream portion 52 bending from the tip of the second total cutting line upstream portion 51 toward the second outer peripheral portion 37 and extending in a direction inclined with respect to the tensile direction D6. The second total cutting line downstream portion 52 may extend while curving from the tip of the second total cutting line upstream portion 51 and be smoothly connected to the second total cutting line upstream portion 51. The tip of the second complete cutting line 50 on the side of the pinching portion 34 is referred to as the base end 50a, the tip of the second complete cutting line 50 on the side opposite the pinching portion 34 is referred to as the tip 50b, and the location where the second complete cutting line 50 bends toward the second outer peripheral portion 37 or where it begins to curve is referred to as the bending point 50c. The base end 50a is also the tip of the second complete cutting line upstream portion 51 on the side of the pinching portion 34. The tip 50b is also the tip of the second complete cutting line downstream portion 52 on the side opposite the pinching portion 34. The bending point 50c is also the location where the second complete cutting line upstream portion 51 and the second complete cutting line downstream portion 52 are connected.

[0040] The first cut line upstream portion 41 and the second cut line upstream portion 51 are parallel to each other. The first cut line downstream portion 42 has a first straight portion extending in a straight line to the tip 40b. When the first cut line downstream portion 42 is bent from the tip of the first cut line upstream portion 41 toward the first outer peripheral portion 36 and extends in a direction inclined with respect to the tensile direction D6, the entire first cut line downstream portion 42 becomes the first straight portion. On the other hand, when the first cut line downstream portion 42 extends while curving from the tip of the first cut line upstream portion 41, a part of the first cut line downstream portion 42 including the tip 40b becomes the first straight portion. The second cut line downstream portion 52 has a second straight portion extending in a straight line to the tip 50b. When the second cut line downstream portion 52 is bent from the tip of the second cut line upstream portion 51 toward the second outer peripheral portion 37 and extends in a direction inclined with respect to the tensile direction D6, the entire second cut line downstream portion 52 becomes the second straight portion. On the other hand, when the second full cut line downstream portion 52 extends while curving from the tip of the second full cut line upstream portion 51, a part including the tip 50b of the second full cut line downstream portion 52 becomes the second straight portion.

[0041] The first straight line portion, which is the entirety or a part of the first full cut line downstream portion 42, and the second straight line portion, which is the entirety or a part of the second full cut line downstream portion 52, extend in a direction away from each other in the tensile direction D6. That is, the first straight line portion, which is the entirety or a part of the first full cut line downstream portion 42, extends in a direction inclined toward the first outer peripheral portion 36 with respect to the tensile direction D6, and the second straight line portion, which is the entirety or a part of the second full cut line downstream portion 52, extends in a direction inclined toward the second outer peripheral portion 37 with respect to the tensile direction D6. FIG. 5 is a plan view showing an enlarged portion of the lid material according to the embodiment. As shown in FIG. 5, a triangle is formed by a straight line L3 passing through the first connection point 61c and the second connection point 61d, a straight line L4 passing through the first straight line portion, and a straight line L5 passing through the second straight line portion.

[0042] As shown in FIG. 1 and FIG. 4, the back half-slicing line 60 is a half-slicing line formed on the back surface 3b side of the lid body 33. In other words, the back half-slicing line 60 is a half-slicing line cut into the lid body 33 from the back surface 3b toward the front surface 3a so as not to reach the front surface 3a. The front half-slicing line 70 is a half-slicing line formed on the front surface 3a side of the lid body 33. In other words, the front half-slicing line 70 is a half-slicing line cut into the lid body 33 from the front surface 3a toward the back surface 3b so as not to reach the back surface 3b. The half-slicing line is also called a half-cut line. In the thickness direction D1, the cutting tip of the back half-slicing line 60 is preferably located closer to the front surface 3a than the cutting tip of the front half-slicing line 70. Similarly, in the thickness direction D1 of the lid material 3, the cutting tip of the front half-slicing line 70 is preferably located closer to the back surface 3b than the cutting tip of the back half-slicing line 60. However, due to defects in the formation of the back half cutting line 60 and the front half cutting line 70, the cutting tip of the back half cutting line 60 may be located closer to the surface 3a than the cutting tip of the front half cutting line 70. In plan views such as Figure 1, the front half cutting line 70 is shown by a solid line, and the back half cutting line 60 is shown by a dashed line.

[0043] The back half cut line 60 has a back half cut main line 61, a first back half cut guiding line 63, and a second back half cut guiding line 64.

[0044] The back half cut main line 61 is formed in the opening arrangement portion 39 of the lid body 33. The back half cut main line 61 extends along the outer periphery of the lid body 33. In other words, the back half cut main line 61 extends endlessly so as to go around the outer periphery of the lid body 33. The back half cut main line 61 has a first back half cut main line portion 61a and a second back half cut main line portion 61b. The first back half cut main line portion 61a extends along the outer periphery of the lid body 33 except for the corner portion 35 of the lid body 33. The second back half cut main line portion 61b is connected to one end of the first back half cut main line portion 61a and the other end of the first back half cut main line portion 61a. Of the two connection points at which the first half-cut back main line portion 61a and the second half-cut back main line portion 61b are connected, the connection point located on the first outer peripheral portion 36 side is referred to as the first connection point 61c, and the connection point located on the second outer peripheral portion 37 side is referred to as the second connection point 61d. The first half-cut back main line portion 61a extends from the first connection point 61c to the second connection point 61d so as to pass on the side opposite to the corner portion 35. The second half-cut back main line portion 61b extends from the first connection point 61c to the second connection point 61d so as to pass on the corner portion 35 side. The second half-cut back main line portion 61b extends in a straight line. However, the second half-cut back main line portion 61b may extend in a curved line or a bent line.

[0045] The first back half cut guiding line 63 extends from the vicinity of the first full cut line 40, more specifically, from the vicinity of the bending point 40c of the first full cut line 40, and is connected to the back half cut main line 61. The first back half cut guiding line 63 is connected to the back half cut main line 61 at a first connection point 61c. Therefore, the first connection point 61c is also a connection point where the back half cut main line 61 and the first back half cut guiding line 63 are connected. The tip of the first back half cut guiding line 63 on the first full cut line 40 side is called a tip 63a. The vicinity of the first full cut line 40 refers to a position separated from the first full cut line 40 and close to the first full cut line 40. Therefore, the tip 63a of the first back half cut guiding line 63 is separated from the first full cut line 40. The tip 63a of the first back half cut guiding line 63 is formed in the flange arrangement portion 38 of the lid main body 33.

[0046] The second back half cut guiding line 64 extends from the vicinity of the second full cut line 50, more specifically, from the vicinity of the bending point 50c of the second full cut line 50, and is connected to the back half cut main line 61. The first back half cut guiding line 63 is connected to the back half cut main line 61 at the second connection point 61d. Therefore, the second connection point 61d is also the connection point where the back half cut main line 61 and the second back half cut guiding line 64 are connected. The tip of the second back half cut guiding line 64 on the second full cut line 50 side is called the tip 64a. The vicinity of the second full cut line 50 refers to a position separated from the second full cut line 50 and close to the second full cut line 50. Therefore, the tip 64a of the second back half cut guiding line 64 is separated from the second full cut line 50. The tip 64a of the second back half cut guiding line 64 is formed in the flange arrangement portion 38 of the lid main body 33.

[0047] The front half cutting line 70 is formed in the flange arrangement portion 38 of the lid body 33. The front half cutting line 70 is located between the back half cutting line 60 and the outer periphery of the lid material 3. The front half cutting line 70 extends along the outer periphery of the lid body 33 excluding the corners 35 of the lid body 33. The front half cutting line 70 extends along the outer periphery of the lid body 33 from the vicinity of the first full cutting line 40 to the vicinity of the second full cutting line 50, passing on the side opposite to the corners 35.

[0048] The surface half-slit line 70 has a first surface half-slit line portion 71 and a second surface half-slit line portion 72 .

[0049] The first front half cut line portion 71 is the tip portion of the front half cut line 70 on the first full cut line 40 side. The first front half cut line portion 71 is located between the first outer peripheral portion 36 and the back half cut line 60. The first front half cut line portion 71 extends from near the tip 40b of the first full cut line 40 along the first outer peripheral portion 36 in the short side direction D2 (a direction perpendicular to the grain direction D4). The tip of the first front half cut line portion 71 on the first full cut line 40 side is referred to as the tip 71a. The tip 71a of the first front half cut line portion 71 is separated from the first full cut line 40.

[0050] The second front half cut line portion 72 is the tip portion of the front half cut line 70 on the second full cut line 50 side. The second front half cut line portion 72 is located between the second outer peripheral portion 37 and the back half cut line 60. The second front half cut line portion 72 extends from near the tip 50b of the second full cut line 50 along the second outer peripheral portion 37 in the long side direction D3 (grain direction D4). The tip of the second front half cut line portion 72 on the second full cut line 50 side is referred to as the tip 72a. The tip 72a of the second front half cut line portion 72 is separated from the second full cut line 50.

[0051] A tip 71a of the first surface half cut line portion 71 is located on the opposite side to the first outer peripheral portion 36 of the first full cutting line 40. In other words, when viewed from the long side direction D3, a part of the first surface half cut line portion 71 is located on the opposite side to the first outer peripheral portion 36 of the first full cutting line 40 and is located so as to overlap a part of the first full cutting line 40. A tip 72a of the second surface half cut line portion 72 is located on the opposite side to the tab portion 34 than a tip 50b of the second full cutting line 50 in the long side direction D3.

[0052] Here, a line passing through the first connection point 61c and inclining at 45° in a direction away from the knob portion 34 with respect to the protruding direction D5, or a line passing through the first connection point 61c and extending in the long side direction D3 of the lid main body 33 is defined as a first reference line L1. The first reference line L1 may be a line passing through the first connection point 61c and inclining at 45° in a direction away from the knob portion 34 with respect to the protruding direction D5, and may also be a line passing through the first connection point 61c and extending in the long side direction D3 of the lid main body 33. The first reference line L1 is a virtual line on the lid main body 33. The tip 40b of the first full cutting line 40 is located on the opposite side of the knob portion 34 with respect to the first reference line L1. That is, in a direction perpendicular to the first reference line L1, the tip 40b of the first full cutting line 40 is located farther from the knob portion 34 than the first connection point 61c. In addition, in the short side direction D2 of the lid main body 33, the tip 40b of the first entire cutting line 40 is located farther from the knob portion 34 than the first connection point 61c.

[0053] Also, a line passing through the second connection point 61d and inclined at 45° in a direction away from the knob portion 34 with respect to the protruding direction D5, or a line passing through the second connection point 61d and extending in the short side direction D2 of the lid main body 33 is defined as a second reference line L2. The second reference line L2 may be a line passing through the second connection point 61d and inclined at 45° in a direction away from the knob portion 34 with respect to the protruding direction D5, and may also be a line passing through the second connection point 61d and extending in the short side direction D2 of the lid main body 33. The second reference line L2 is a virtual line on the lid main body 33. The tip 50b of the second full cutting line 50 is located on the opposite side of the knob portion 34 with respect to the second reference line L2. That is, in a direction perpendicular to the second reference line L2, the tip 50b of the second full cutting line 50 is located farther from the knob portion 34 than the second connection point 61d. In addition, in the long side direction D3 of the lid main body 33, the tip 50b of the second full cutting line 50 is located farther from the knob portion 34 than the second connection point 61d.

[0054] 6 is a plan view of a portion of the lid according to the embodiment, which is enlarged. As shown in FIG. 6, a straight line passing through the tip 40b of the first cut line 40 and the tip 50b of the second cut line 50 is defined as a cut line tip reference line L6, and a straight line passing through the first connection point 61c and the second connection point 61d is defined as a connection point reference line L7. In this case, the inclination angle of the cut line tip reference line L6 with respect to the connection point reference line L7 is preferably 10° or less, more preferably 8° or less, and even more preferably 5° or less. The inclination angle of the cut line tip reference line L6 with respect to the connection point reference line L7 being 10° or less includes the case where the connection point reference line L7 and the cut line tip reference line L6 are parallel to each other.

[0055] The positional relationship between the first connection point 61c and the second connection point 61d and the total cutting line tip reference line L6 in the protrusion direction D5 is not particularly limited, but it is preferable that the first connection point 61c and the second connection point 61d are located on the opposite side of the knob portion 34 with respect to the total cutting line tip reference line L6.

[0056] 1 and 2, in the lidded container 1, the lid material 3 is joined to the flange 22 of the container 2 so that the flange arrangement portion 38 is arranged on the flange 22 and the opening arrangement portion 39 is arranged on the opening 21 side of the flange 22. In other words, the lid material 3 is joined to the flange 22 of the container 2 so that the front half-cut line 70 is arranged on the flange 22 and the back half-cut main line 61 is arranged on the opening 21 side of the flange 22.

[0057] In the container with lid 1 thus configured, when the tab 34 is pulled in the pulling direction D6 to open the lid material 3, the lid body 33 is delaminated between the first full cut line 40 and the first back half cut guide line 63. The peeling surface of this delamination progresses from the first full cut line 40 to the first front half cut line portion 71, and also progresses from the first back half cut guide line 63 to the second back half cut main line portion 61b. In addition, the lid body 33 is delaminated between the second full cut line 50 and the second back half cut guide line 64. The peeling surface of this delamination progresses from the second full cut line 50 to the second front half cut line portion 72, and also progresses from the second back half cut guide line 64 to the second back half cut main line portion 61b. As a result, the lid body 33 is delaminated between the front half cut line 70 and the second back half cut main line portion 61b, and the lid material 3 is opened.

[0058] Here, a lid material of a comparative example will be described with reference to Fig. 13. Fig. 13 is a plan view showing an enlarged portion of the lid material of the comparative example. As shown in Fig. 13, the lid material 103 of the comparative example is basically the same as the lid material 3 of the present embodiment, but is different from the lid material 3 of the present embodiment in the relationship between the tip of the first full cutting line on the opposite side to the pinching portion and the first reference line, and the relationship between the tip of the second full cutting line on the opposite side to the pinching portion and the second reference line.

[0059] The lid body 133 of the lid material 103 of the comparative example has a first full cutting line 140 corresponding to the first full cutting line 40 of the above embodiment, a second full cutting line 150 corresponding to the second full cutting line 50 of the above embodiment, a back half cutting line 60, and a front half cutting line 170 corresponding to the front half cutting line 70 of the above embodiment.

[0060] The first total cutting line 140 has a first total cutting line upstream portion 41 and a first total cutting line downstream portion 142 corresponding to the first total cutting line downstream portion 42 of the above embodiment. The first total cutting line downstream portion 142 extends to a position farther from the pinching portion 34 than the first total cutting line downstream portion 42 of the above embodiment. The second total cutting line 150 has a second total cutting line upstream portion 51 and a second total cutting line downstream portion 152 corresponding to the second total cutting line downstream portion 52 of the above embodiment. The second total cutting line downstream portion 152 extends to a position farther from the pinching portion 34 than the second total cutting line downstream portion 52 of the above embodiment.

[0061] The front half cutting line 170 has a first front half cutting line portion 171 corresponding to the first front half cutting line portion 71 of the above embodiment, and a second front half cutting line portion 172 corresponding to the second front half cutting line portion 72 of the above embodiment. A tip 171a of the first front half cutting line portion 171 on the first full cutting line 140 side is located farther from the tab portion 34 than the tip 71a of the first front half cutting line portion 71 of the above embodiment, and is located near the tip 140b of the first full cutting line 140 on the opposite side to the tab portion 34. A tip 172a of the second front half cutting line portion 172 on the second full cutting line 150 side is located farther from the tab portion 34 than the tip 72a of the second front half cutting line portion 72 of the above embodiment, and is located near the tip 150b of the second full cutting line 150 on the opposite side to the tab portion 34.

[0062] The tip 140b of the first cutting line 140 is located on the side of the gripping portion 34 with respect to the first reference line L1, and the tip 150b of the second cutting line 150 is located on the side of the gripping portion 34 with respect to the second reference line L2.

[0063] As shown in Fig. 13, in a container with a lid in which the lid material 103 of the comparative example is joined to the flange 22 of the container 2, when the handle portion 34 is pulled in the tensile direction D6, the lid body 33 is delaminated at a portion sandwiched between the first full cutting line 140 and the second full cutting line 150. Then, the fracture of the lid body 133 progresses from the bending point 40c of the first full cutting line 140 or its vicinity to the first back half cutting guide line 63, and the fracture of the lid body 133 progresses from the bending point 50c of the second full cutting line 150 or its vicinity to the second back half cutting guide line 64. After that, the fracture of the lid body 133 progresses from the tip 140b of the first full cutting line 140 to the first front half cutting line portion 171, and the fracture of the lid body 133 progresses from the tip 150b of the second full cutting line 150 to the second front half cutting line portion 172.

[0064] Fig. 14 is a schematic end view taken along line XIV-XIV in Fig. 13. Fig. 15 is a schematic end view corresponding to Fig. 14, showing a state in which the lid body is delaminated. As shown in Figs. 13 to 15, when the fracture of the lid body 133 progresses from the first full cutting line 140 to the first back half cut guiding line 63 and from the second full cutting line 150 to the second back half cut guiding line 64, the lid body 133 is delaminated between the first full cutting line 140 and the first back half cut guiding line 63, between the first back half cut guiding line 63 and the second back half cut guiding line 64, and between the second back half cut guiding line 64 and the second full cutting line 150. That is, the peeled surfaces of this interlayer peeling are a peeled surface 133a from the first full cut line 140 to the first back half cut guiding line 63, a peeled surface 133b from the first back half cut guiding line 63 to the second back half cut guiding line 64, and a peeled surface (not shown) from the second back half cut guiding line 64 to the second full cut line 150. The part of the lid body 133 on the peeled surface 103a side is referred to as a peeled portion 133c.

[0065] FIG. 16 is a schematic end view taken along line XVI-XVI in FIG. 13. FIG. 17 is a schematic end view corresponding to FIG. 16, showing a state in which the lid body is delaminated. FIG. 18 is a schematic end view taken along line XVIII-XVIII in FIG. 13. FIG. 19 is a schematic end view corresponding to FIG. 18, showing a state in which the lid body is delaminated. As shown in FIG. 13, FIG. 16, and FIG. 17, when the delamination of the lid body 133 progresses to the tip 140b of the first full cutting line 140, the peeled portion 133c of the lid body 133 breaks, and this breakage progresses from the tip 140b of the first full cutting line 140 to the first front half cutting line portion 171. Here, consider a case in which the cutting tip 170a of the front half cutting line 170 is located closer to the front surface 103a than the cutting tip 60a of the back half cutting line 60 (see FIG. 16). In this case, the breakage of the peeled portion 133c of the lid body 133 progresses from the tip 140b of the first full cut line 140 to the first front half cut line portion 171, so that the peeled surface 133a is pulled up toward the front surface 103a of the lid material 103 and may move toward the front surface 103a side from the back half cut line 60. As a result, an opening defect occurs in which the peeled surface 133a passes through the front surface 103a side of the first back half cut guiding line 63 and the second back half cut main line portion 61b and progresses to the inside of the lid body 133. If the peeled surface 133a moves toward the front surface 103a side from the first back half cut guiding line 63, as shown in Figures 13, 18, and 19, even if the interlayer peeling of the lid body 133 progresses beyond the first connection point 61c, the peeled surface 133a is likely to pass through the front surface 103a side of the first back half cut main line portion 61a. As a result, the peel surface 133a passes through the front surface 103a side of the second back half cut main line portion 61b and progresses to the inside of the lid body 133, resulting in a defective opening.

[0066] Similarly, when the interlayer peeling of the lid body 133 progresses to the tip 150b of the second full cutting line 150, the peeled portion 133c of the lid body 133 breaks, and this breakage progresses from the tip 150b of the second full cutting line 150 to the second front half cutting line portion 172. Here, consider a case where the cutting tip 170a of the front half cutting line 170 is located closer to the front surface 103a than the cutting tip 60a of the back half cutting line 60 (see FIG. 16). In this case, as the breakage of the peeled portion 133c of the lid body 133 progresses from the tip 150b of the second full cutting line 150 to the second front half cutting line portion 172, the peeled surface may be pulled up to the front surface 103a side of the lid material 103, and may move closer to the front surface 103a than the second back half cutting guide line 64. As a result, an opening failure occurs in which the peeling surface passes through the surface 103a side of the second back half cut guiding line 64 and the second back half cut main line portion 61b and progresses to the inside of the lid body 133. If the peeling surface moves toward the surface 103a side from the second back half cut guiding line 64, even if the interlayer peeling of the lid body 133 progresses beyond the second connection point 61d, the peeling surface is likely to pass through the surface 103a side of the first back half cut main line portion 61a. As a result, an opening failure occurs in which the peeling surface passes through the surface 103a side of the second back half cut main line portion 61b and progresses to the inside of the lid body 133.

[0067] 7 is a schematic end view taken along line VII-VII in FIG. 4. FIG. 8 is a schematic end view corresponding to FIG. 7, showing a state in which the lid body is delaminated. As shown in FIG. 1, FIG. 4, FIG. 7, and FIG. 8, in the lid-equipped container 1 of this embodiment, when the gripping portion 34 is pulled in the tensile direction D6, the lid body 33 is delaminated at a portion sandwiched between the first full cut line 40 and the second full cut line 50. Then, when the fracture of the lid body 33 progresses from the first full cut line 40 to the first back half cut guiding line 63 and the second full cut line 50 to the second back half cut guiding line 64, the lid body 33 is delaminated between the first full cut line 40 and the first back half cut guiding line 63, between the first back half cut guiding line 63 and the second back half cut guiding line 64, and between the second back half cut guiding line 64 and the second full cut line 50. That is, the peeled surfaces of this interlayer peeling are peeled surface 33a from first full cut line 40 to first back half cut guiding line 63, peeled surface 33b from first back half cut guiding line 63 to second back half cut guiding line 64, and a peeled surface (not shown) from second back half cut guiding line 64 to second full cut line 50. The part of lid body 33 on the peeled surface 3a side is called peeled portion 33c.

[0068] FIG. 9 is a schematic end view taken along line IX-IX in FIG. 4. FIG. 10 is a schematic end view corresponding to FIG. 9, showing a state in which the lid body is delaminated. FIG. 11 is a schematic end view taken along line XI-XI in FIG. 4. FIG. 12 is a schematic end view corresponding to FIG. 11, showing a state in which the lid body is delaminated. As shown in FIG. 4 and FIG. 9 to FIG. 12, when the delamination of the lid body 33 progresses to the tip 40b of the first full cutting line 40, the peeled portion 33c of the lid body 33 breaks, and this breakage progresses from the tip 40b of the first full cutting line 40 to the first front half cutting line portion 71. Here, consider a case in which the cutting tip 70a of the front half cutting line 70 is located closer to the front surface 3a than the cutting tip 60a of the back half cutting line 60 (see FIG. 11). In this case, the breakage of the peeled portion 33c of the lid body 33 progresses from the tip 40b of the first full cut line 40 to the first front half cut line portion 71, so that the peeled surface 33a is pulled up toward the front surface 3a of the lid material 3 and may move toward the front surface 3a side of the back half cut line 60. However, since the tip 40b of the first full cut line 40 is located on the opposite side of the knob portion 34 with respect to the first reference line L1, before the interlayer peeling of the lid body 33 progresses to the first back half cut main line portion 61a, so that the peeled surface 33a is likely to reach the first back half cut main line portion 61a. Therefore, a force acts to lift the portion surrounded by the back half cut main line 61 from the back surface 3b side of the lid material 3, and the portion between the peeled surface 33a and the first back half cut main line portion 61a is likely to be torn off. As a result, defective opening caused by the peel surface 33a passing through the front surface 3a side of the second back half cut main line portion 61b and progressing to the inside of the lid body 33 is less likely to occur.

[0069] Similarly, when the interlayer peeling of the lid body 33 progresses to the tip 50b of the second full cutting line 50, the peeled portion 33c of the lid body 33 breaks, and this breakage progresses from the tip 50b of the second full cutting line 50 to the second front half cutting line portion 72. Here, consider a case where the cutting tip 70a of the front half cutting line 70 is located closer to the front surface 3a than the cutting tip 60a of the back half cutting line 60 (see FIG. 11). In this case, as the breakage of the peeled portion 33c of the lid body 33 progresses from the tip 50b of the second full cutting line 50 to the second front half cutting line portion 72, the peeled surface may be pulled up to the front surface 3a side of the lid material 3 and move closer to the front surface 3a side than the back half cutting line 60. However, since the tip 50b of the second full cut line 50 is located on the opposite side of the tab portion 34 with respect to the second reference line L2, before the delamination of the lid body 33 advances to the tip 50b of the second full cut line 50, the delamination of the lid body 33 advances to the first back half cut main line portion 61a, and the peeled surface is likely to reach the first back half cut main line portion 61a. Therefore, a force acts to lift the portion surrounded by the back half cut main line 61 from the back surface 3b side of the lid material 3, and the portion between the peeled surface and the first back half cut main line portion 61a is likely to be torn off. As a result, opening defects in which the peeled surface passes through the front surface 3a side of the second back half cut main line portion 61b and advances to the inside of the lid body 33 are unlikely to occur.

[0070] As described above, in the lid material 3 according to this embodiment, the lid body 33 has the first full cut line 40 extending from the gripping portion 34, the back half cut line 60 formed on the back surface of the lid body 33, and the front half cut line 70 formed on the front surface of the lid body 33, the back half cut line 60 has the back half cut main line 61 extending along the outer periphery of the lid body 33, and the first back half cut guide line 63 extending from the vicinity of the first full cut line 40 and connected to the back half cut main line 61, and the front half cut line 70 has the first front half cut line portion 71 extending from the vicinity of the tip 40b of the first full cut line 40 on the opposite side to the gripping portion 34. Therefore, when an attempt is made to open the lid body 33 by pulling the gripping portion 34, the lid body 33 is delaminated between the first full cut line 40 and the first back half cut guide line 63. The peel surface 33a of the delamination progresses from the first full cutting line 40 to the first front half cutting line portion 71, and also progresses from the first back half cutting guide line 63 to the back half cutting main line 61. As a result, the lid body 33 is delaminated between the front half cutting line 70 and the back half cutting main line 61, and the lid material 3 is opened.

[0071] Moreover, in this lid material 3, the tip 40b of the first full cut line 40 is located on the opposite side of the tab portion 34 with respect to the first reference line L1. Therefore, the interlayer peeling is likely to progress to the first back half cut main line portion 61a before progressing to the tip 40b of the first full cut line 40. Therefore, even if the peeling surface 33a moves toward the front surface 3a of the lid material 3 from the back half cut main line 61 as the fracture of the lid body 33 progresses from the tip 40b of the first full cut line 40 to the first front half cut line portion 71, a force acts to lift the portion surrounded by the back half cut main line 61 from the back surface 3b side of the lid material 3, and the portion between the peeling surface 33a and the first back half cut main line portion 61a is likely to be torn off. This improves the reliability of opening.

[0072] In addition, in this lid material 3, the lid body 33 has a second full cut line 50 extending from the gripping portion 34, the back half cut line 60 has a second back half cut guide line 64 extending from the vicinity of the second full cut line 50 and connected to the back half cut main line 61, and the front half cut line 70 has a second front half cut line portion 72 extending from the vicinity of the tip 50b of the second full cut line 50 on the opposite side to the gripping portion 34. Therefore, when an attempt is made to open the lid material 3 by pulling the gripping portion 34, the lid body 33 is delaminated between the second full cut line 50 and the second back half cut guide line 64. The peeling surface of the delamination progresses from the second full cut line 50 to the second front half cut line portion 72 and from the second back half cut guide line 64 to the back half cut main line 61. As a result, the lid body 33 is delaminated between the front half cut line 70 and the back half cut main line 61, and the lid material 3 is opened.

[0073] Moreover, in this lid material 3, the tip 50b of the second full cut line 50 is located on the opposite side of the tab portion 34 with respect to the second reference line L2. Therefore, the interlayer peeling is likely to progress to the second back half cut main line portion 61b before progressing to the tip 50b of the second full cut line 50. Therefore, even if the peeling surface moves toward the front surface 3a of the lid material 3 from the back half cut main line 61 as a result of the breakage of the lid body 33 progressing from the tip 50b of the second full cut line 50 to the second front half cut line portion 72, a force acts to lift the portion surrounded by the back half cut main line 61 from the back surface 3b side of the lid material 3, and the portion between the peeling surface and the first back half cut main line portion 61a is likely to be torn off. This improves the reliability of opening.

[0074] In addition, in this lid material 3, the first straight line portion extending in a straight line to the tip of the first total cutting line 40 and the second straight line portion extending in a straight line to the tip of the second total cutting line 50 extend in directions away from each other in the tensile direction D6, so that a triangle is formed by the straight line passing through the first connection point 61c and the second connection point 61d, the straight line passing through the first straight line portion, and the straight line passing through the second straight line portion. As a result, when the gripping portion 34 is lifted, the lid body is easily bent on the straight line passing through the first connection point 61c and the second connection point 61d, so that the gripping portion 34 can be easily lifted.

[0075] In addition, in this lid member 3, the inclination angle of the all-cut line tip reference line L6 with respect to the connection point reference line L7 is 10° or less, 8° or less, or 5° or less, so that when the gripping portion 34 is lifted, the lid body 33 is easily bent on the connection point reference line L7. This makes it easier to lift the gripping portion 34, so that the lid member 3 can be easily opened.

[0076] In addition, when attempting to open the lid material 3 by pulling the tab 34, the resistance to opening the lid material 3 becomes large at the tip 40b of the first full cutting line 40 and the tip 50b of the second full cutting line 50, causing the lid body to bend at the full cutting line tip reference line L6. Since the first connection point 61c and the second connection point 61d are located on the opposite side of the tab 34 with respect to the full cutting line tip reference line L6, the lid body 33 can be smoothly broken from the tip 40b of the first full cutting line 40 and the tip 50b of the second full cutting line 50 to the back half-cut main line 61.

[0077] In addition, in this lid material 3, the front half-cut line 70 is formed in the flange arrangement portion 38 that is arranged on the flange 22, and the back half-cut main line 61 is formed in the opening arrangement portion 39 that is arranged closer to the opening 21 than the flange 22. Therefore, when the peel-off surface 33a advances to the first back half-cut main line portion 61a, a force that tries to appropriately lift the portion surrounded by the back half-cut main line 61 from the back surface side of the lid material 3 is easily applied. This makes it easier to tear off the portion between the peel-off surface 33a and the first back half-cut main line portion 61a.

[0078] In the lidded container 1 according to this embodiment, the above-mentioned lid member 3 is joined to the flange 22 to close the opening 21, so that the reliability of opening can be improved.

[0079] Although an embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and may be modified or applied to other things without departing from the gist of the claims.

[0080] For example, in the above embodiment, the lid material is described as being formed into a rectangular shape that is long in the long side direction and short in the short side direction, but the shape of the lid material is not particularly limited and may be formed into, for example, a square shape, a pentagonal shape, a hexagonal shape, an octagonal shape, a circular shape, an elliptical shape, etc.

[0081] In addition, in the above embodiment, the first outer peripheral portion is described as extending in a direction perpendicular to the grain direction, and the second outer peripheral portion is described as extending in the grain direction, but the grain direction may be a direction other than the above.

[0082] In the above embodiment, the tip of the first total cutting line on the opposite side to the pinching portion is located farther from the pinching portion than the first reference line, and the tip of the second total cutting line on the opposite side to the pinching portion is located farther from the pinching portion than the first reference line, but at least one of the tip of the first total cutting line on the opposite side to the pinching portion and the tip of the second total cutting line on the opposite side to the pinching portion may be located farther from the pinching portion than the first reference line. In other words, either one of the tip of the first total cutting line on the opposite side to the pinching portion and the tip of the second total cutting line on the opposite side to the pinching portion does not have to be located farther from the pinching portion than the first reference line.

[0083] In addition, in the above embodiment, the specific shapes of the first full cutting line, the second full cutting line, the back half cutting line, and the front half cutting line are described, but the shapes of these cutting lines are not particularly limited and can be changed as appropriate. [Explanation of symbols]

[0084] 1...container with lid, 2...container, 3...lid material, 3a...surface, 3b...backside, 21...opening, 22...flange, 23...contents, 31...sealant layer, 32...paper base layer, 33...lid body, 33a...release surface, 33b...release surface, 33c...released portion, 34...grip portion, 34a...imaginary boundary line, 35...corner portion, 36...first outer periphery, 37...second outer periphery, 38...flange arrangement portion, 39...opening arrangement portion, 40...first total cut line, 40a...base end, 40b ...tip, 40c...bending point, 41...upstream portion of first full cut line, 42...downstream portion of first full cut line, 50...second full cut line, 50a...base end, 50b...tip, 50c...bending point, 51...upstream portion of second full cut line, 52...downstream portion of second full cut line, 60...back half cut line, 60a...cutting tip, 61...back half cut main line, 61a...first back half cut main line portion, 61b...second back half cut main line portion, 61c...first connection point, 61d...second connection point, 63...first back half cut guide line, 63a...tip, 64...second back half cut guide line, 64a...tip, 70...front half cut line, 70a...cut tip, 71...first front half cut line portion, 71a...tip, 72...second front half cut line portion, 72a...tip, 103...lid material, 103a...surface, 133...lid main body, 133a...peeling surface, 133b...peeling surface, 133c...peeling portion, 140...first full cut line, 140b...tip, 142...downstream portion of first full cut line, 150...second full cut line, 150b...tip Edge, 152...downstream portion of second full cut line, 170...front half cut line, 170a...cut tip, 171...first front half cut line portion, 171a...tip, 172...second front half cut line portion, 172a...tip, D1...thickness direction, D2...short side direction, D3...long side direction, D4...grain direction, D5...protrusion direction, D6...pulling direction, L1...first reference line, L2...second reference line, L3...straight line, L4...straight line, L5...straight line, L6...full cut line tip reference line, L7...connection point reference line.

Claims

1. A sheet-like lid material for joining to a flange of a container having an opening and a flange extending from the opening to close the opening, comprising: a lid body joined to the flange to close the opening; A knob protruding from the lid body, The lid body is A first cut line extending from the knob portion; A back half-cut line formed on the back surface of the lid body; A surface half-cut line formed on the surface of the lid body, The back half cut line is A back half-cut main line extending along the outer periphery of the lid body; A first back half cut guide line extending from the vicinity of the first full cut line and connected to the back half cut main line, the surface half-slicing line has a first surface half-slicing line portion extending from a vicinity of a tip end of the first full-slicing line on a side opposite to the tab portion, The tip of the first full cutting line is located on the opposite side of the gripping portion with respect to a first reference line that passes through a first connection point where the back half cutting main line and the first back half cutting guide line are connected and is inclined at 45° in a direction away from the gripping portion with respect to the protruding direction of the gripping portion. Lid material.

2. The lid body has a second full cut line extending from the knob portion, The back half cut line has a second back half cut guide line extending from the vicinity of the second full cut line and connected to the back half cut main line, the surface half-slicing line has a second surface half-slicing line portion extending from a vicinity of a tip end of the second full-slicing line on a side opposite to the tab portion, The tip of the second full cut line is located on the opposite side of the tab with respect to a second reference line that passes through a second connection point where the back half cut main line and the second back half cut guide line are connected and is inclined at 45° in a direction away from the tab with respect to the protruding direction of the tab, The lid material according to claim 1.

3. A sheet-like lid material for joining to a flange of a container having a rectangular opening and a flange extending from the opening to close the opening, a rectangular lid body joined to the flange to close the opening; a knob located at a corner between a short side and a long side of the lid body and protruding from the lid body; The lid body is A first cut line extending from the knob portion; A back half-cut line formed on the back surface of the lid body; A surface half-cut line formed on the surface of the lid body, The back half cut line is A back half-cut main line extending along the outer periphery of the lid body; A first back half cut guide line extending from the vicinity of the first full cut line and connected to the back half cut main line, the surface half-slicing line has a first surface half-slicing line portion extending from a vicinity of a tip end of the first full-slicing line on a side opposite to the tab portion, The tip of the first full cutting line is located on the opposite side of the knob portion with respect to a first reference line extending in the long side direction of the lid body through a first connection point where the back half cutting main line and the first back half cutting guide line are connected, Lid material.

4. The lid body has a second full cut line extending from the knob portion, The back half cut line has a second back half cut guide line extending from the vicinity of the second full cut line and connected to the back half cut main line, the surface half-slicing line has a second surface half-slicing line portion extending from a vicinity of a tip end of the second full-slicing line on a side opposite to the tab portion, The tip of the second full cutting line is located on the opposite side of the knob portion with respect to a second reference line extending in the short side direction of the lid body through a second connection point where the back half cutting main line and the second back half cutting guide line are connected, The lid material according to claim 3.

5. The first entire cutting line has a first straight portion that extends linearly to the tip of the first entire cutting line, The second entire cutting line has a second straight portion that extends linearly to the tip of the second entire cutting line, The first straight portion and the second straight portion extend in a direction opposite to a protruding direction of the knob portion and away from each other. The lid material according to claim 2.

6. When a straight line passing through the tip of the first total cutting line and the tip of the second total cutting line is defined as a total cutting line tip reference line, and a straight line passing through the first connection point and the second connection point is defined as a connection point reference line, the inclination angle of the total cutting line tip reference line with respect to the connection point reference line is 10° or less. The lid material according to claim 2.

7. The first connection point and the second connection point are located on opposite sides of the knob portion with respect to the total cutting line tip reference line. The lid material according to claim 6.

8. The lid body is a flange mounting portion disposed on the flange; an opening arrangement portion located inside the flange arrangement portion and arranged on the opening side of the flange, The surface half-cut line is formed in the flange arrangement portion, The back half-cut main line is formed in the opening arrangement portion. The lid material according to claim 1.

9. a container having an opening and a flange formed around the periphery of the opening; The lid material according to any one of claims 1 to 8, The lid is joined to the flange to close the opening. Container with lid.

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