JP2020037433A - Paper lid - Google Patents

Abstract

To provide a paper lid in which contents do not leak easily, and can inhibit mutual fitting of paper lids, and comprises both an inner fitting portion and an outer fitting portion.SOLUTION: In a paper lid 1 which is mainly made of paper, the paper lid 1 includes: a top plate portion 11 which extends in a first direction; an inner fitting portion 12 which extends in a second direction Z2, has a first outer surface 12e and an inner fitting face 12f, and continues to the top plate portion 11; a top portion 13 which extends in a third direction, and continues to the inner fitting portion 12; and an outer fitting portion 14 which extends in a fourth direction Z4, has a second outer surface 14e and an outer fitting face 14f, confronts to the inner fitting portion 12 away from the inner fitting portion, and continues to the top portion 13. Wrinkles 17 exist on each of the first outer surface 12e and the second outer surface 14e.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a paper lid.

  As a lid of a paper container such as a paper cup, a resin lid such as plastic is used. However, when disposing the resin lid, it is necessary to separate the resin lid from a paper cup or a paper container, which is troublesome for the consumer.

  Patent Literature 1 describes a paper lid having a top plate and a trapezoidal groove that is provided on a peripheral side portion of the top plate and that is opened downward and includes an outer wall, an upper wall, and an inner wall. .

Patent No. 3432316

  In Patent Literature 1, a ruled line is provided radially toward the center of the paper blank at predetermined intervals around the center of the paper blank. In a paper lid manufactured using such a paper blank, irregularities due to the ruled line remain in the trapezoidal groove at predetermined intervals along the height direction from the lower part to the upper part of the groove.

  However, if irregularities remain at predetermined intervals along the height direction in the trapezoidal groove, the contents are likely to leak when the container falls. The intervals between the pressing lines are equal between the paper blanks. In a paper lid in which the unevenness due to the ruled line remains, when stacked, the irregularities of the upper and lower paper lids may mesh with each other, and the paper lids may fit. The inner wall corresponds to, for example, an inner fitting portion, and the outer wall corresponds to, for example, an outer fitting portion. For this reason, there is a situation that the content easily leaks into the paper lid provided with each of the inner fitting part and the outer fitting part, and the paper lids may fit into each other. The possibility of the paper lids being fitted together also occurs when the outer surface and the inner fitting surface of the inner fitting portion and the outer surface and the outer fitting surface of the outer fitting portion are each smooth. .

  The present invention has been made in view of the above circumstances, and an object of the invention is to provide an inner fitting portion and an outer fitting portion in which the contents are hardly leaked and the paper covers can be prevented from being fitted into each other. It is to provide a paper lid with each of the parts.

  The paper cover according to the first invention is a paper cover mainly made of paper, wherein the paper cover is provided along a top plate portion extending in a first direction and a circumferential direction of the top plate portion, An inner fitting portion extending in a second direction intersecting the one direction, having a first outer surface and an inner fitting surface on a surface opposite to the first outer surface, and an inner fitting portion continuous with the top plate portion; A top provided along the circumferential direction of the inner fitting portion, extending in a third direction intersecting the second direction, and a top portion continuous with the inner fitting portion, provided along the circumferential direction of the top portion, Extending in a fourth direction intersecting the third direction, having a second outer surface and an outer fitting surface on a surface opposite to the second outer surface, facing away from the inner fitting portion, A first outer surface and a second outer surface each having a wrinkle in a cross section of the paper cover cut along a horizontal plane including a top portion and an outer fitting portion continuous with the top portion. It is characterized in.

  A paper lid according to a second invention is the paper lid according to the first invention, wherein the top has a third outer surface continuous with each of the first outer surface and the second outer surface, and the paper lid is the first outer surface. It further comprises a plurality of wrinkles extending from the outer surface to the second outer surface and straddling the third outer surface.

  A paper lid according to a third invention is the paper lid according to the first invention or the second invention, wherein the paper lid is provided along a circumferential direction of the outer fitting portion, and extends in a fifth direction intersecting the fourth direction. A flange portion that is continuous with the outer fitting portion and that includes an end of the paper lid.

  According to the paper lid of the first invention, each of the first outer surface and the second outer surface has wrinkles. For this reason, it is possible to prevent the contents from leaking easily and to suppress the possibility that the paper covers are fitted.

  According to the paper lid according to the second aspect, the paper cover further includes a plurality of wrinkles extending from the first outer surface to the second outer surface and straddling the third outer surface. For this reason, for example, even if the outer fitting portion is formed by using "ironing", the wrinkle at the top becomes an allowance, and the outer fitting portion can be formed without breaking the blank at the top.

  According to the paper lid according to the third invention, the paper lid includes the flange portion. When the paper cover includes the flange portion, a part of the outer fitting portion is inclined toward the inner fitting portion, so that the paper cover can be hardly removed from the container.

FIG. 1A is a schematic plan view illustrating an example of a paper cover according to an embodiment of the present invention. FIG. 1B is a schematic cross-sectional view taken along line IB-IB in FIG. FIG. 2 is an enlarged schematic cross-sectional view showing the inside of a broken line frame II in FIG. FIG. 3A is a schematic perspective view showing an example of a paper cover according to one embodiment of the present invention. FIG. 3B is a schematic perspective view of the schematic perspective view shown in FIG. FIG. 4A is a drawing substitute photograph showing the end of the flange portion. FIG. 4B is a schematic cross-sectional view showing the shooting direction of the drawing substitute photograph shown in FIG. FIG. 5A is a drawing substitute photograph showing the outer surface of the flange portion. FIG. 5B is a schematic cross-sectional view showing the shooting direction of the drawing substitute photograph shown in FIG. FIG. 6A is a schematic cross-sectional view taken along the line VIA-VIA in FIG. FIG. 6B is a schematic cross-sectional view taken along the line VIB-VIB in FIG. FIG. 7A is a schematic perspective view showing a state where the paper lids 1 are stacked. FIG. 7B is an enlarged schematic cross-sectional view showing each of the inner fitting portion and the outer fitting portion when the paper lids 1 are stacked. FIG. 8 is a schematic sectional view showing an example of a processing machine that can be used for manufacturing a paper lid according to one embodiment of the present invention. FIG. 9 is a schematic cross-sectional view showing an example of a method for manufacturing a paper lid according to one embodiment of the present invention. FIGS. 10A to 10D are schematic cross-sectional views illustrating an example of a method for manufacturing a paper lid according to an embodiment of the present invention. FIGS. 11A to 11D are schematic cross-sectional views illustrating an example of a method for manufacturing a paper lid according to an embodiment of the present invention. FIG. 12A and FIG. 12B are schematic cross-sectional views each showing a mounting surface and a holding surface in a partially enlarged manner. FIG. 13A and FIG. 13B are schematic cross-sectional views each showing a draw die, a blank holder, an annular protrusion, and a plunger in a partially enlarged manner. FIG. 14 is a schematic cross-sectional view showing a draw die, a blank holder, an annular protrusion, and a reduced diameter portion in a partially enlarged manner. FIG. 15A is a schematic cross-sectional view illustrating a paper cover according to the reference example. FIG. 15B is a schematic cross-sectional view illustrating an example of a paper cover according to an embodiment of the present invention. FIG. 16 is a schematic cross-sectional view showing an example of the paper cover according to one embodiment of the present invention. FIGS. 17A to 17C are schematic cross-sectional views illustrating an example of a paper cover according to an embodiment in the order of manufacturing steps. FIG. 18A is a schematic cross-sectional view illustrating an example of a paper cover according to an embodiment of the present invention. FIG. 18B is a schematic cross-sectional view illustrating a paper container that can be fitted to an example of a paper cover according to an embodiment of the present invention. FIG. 19 is a diagram showing the relationship between the taper angle and the ratio.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Paper lid)
FIG. 1A is a schematic plan view illustrating an example of a paper cover according to an embodiment of the present invention, and FIG. 1B is a schematic cross-sectional view taken along line IB-IB in FIG. . FIG. 2 is an enlarged schematic cross-sectional view showing the inside of a broken line frame II in FIG.

  As shown in FIGS. 1 (a), 1 (b), and 2, the paper lid 1 is made of a blank 10 mainly composed of paper, and has a top plate 11, an inner fitting portion 12, and a top portion 13. And an outer fitting portion 14 and a flange portion 15. The shape of the paper cover 1 in plan view is, for example, a circle. The blank 10 may have a ruled line, for example.

  The top plate 11 extends in the first direction X1. The top plate 11 has a top surface 11a and a container surface 11b. The container surface 11b is on the back surface of the top surface 11a. The container surface 11b faces the container portion of the paper container 2 when the paper cover 1 is fitted to the paper container 2.

  The inner fitting portion 12 is provided on the peripheral edge portion OEP of the paper cover 1 along the circumferential direction of the top plate portion 11. The inner fitting portion 12 extends in a second direction Z2 intersecting the first direction X1, and is continuous with the top plate portion 11.

  The top portion 13 is provided on the peripheral portion OEP along the circumferential direction of the inner fitting portion 12. The top portion 13 extends in a third direction X3 intersecting the second direction Z2, and is continuous with the inner fitting portion 12. In the embodiment, the top portion 13 includes a curved surface that is convex in the second direction Z2 in its cross section.

  The outer fitting part 14 is provided on the peripheral part OEP along the circumferential direction of the top part 13. The outer fitting portion 14 extends in a fourth direction Z4 intersecting with the third direction X3, and is continuous with the top portion 13. The outer fitting part 14 is spaced apart from the inner fitting part 12 and faces the inner fitting part 12. Below the top portion 13, between the inner fitting portion 12 and the outer fitting portion 14, an annular recess 16 having the inner fitting portion 12 and the outer fitting portion 14 as surrounding walls and the top portion 13 as the bottom is provided. Provided. A container, for example, the paper container 2 is fitted in the annular recess 16. The paper container 2 is, for example, a paper cup. The inner fitting portion 12 fits with the inner peripheral surface 21 of the container portion of the paper container 2, and the outer fitting portion 14 fits with the outer peripheral surface of the curl portion 22 of the paper container 2.

  The flange portion 15 is provided on the peripheral edge portion OEP along the circumferential direction of the outer fitting portion 14. The flange portion 15 extends in a fifth direction X5 intersecting with the fourth direction Z4, and is continuous with the outer fitting portion 14. The flange 15 includes the end 10 a of the paper lid 1.

  In the cross section of the paper cover 1, the paper cover 1 bends in the second direction Z2 at the inner fitting portion 12, bends in the third direction X3 at the top portion 13, bends in the fourth direction Z4 at the outer fitting portion 14, and has a flange portion. At 15, it turns in the fifth direction X5. That is, each of the inner fitting part 12, the top part 13, the outer fitting part 14, and the flange part 15 is obtained from one blank 10.

  In the paper lid 1 having such a shape, the boundary between the top plate portion 11 and the inner fitting portion 12, the boundary between the inner fitting portion 12 and the top portion 13, the boundary between the top portion 13 and the outer fitting portion 14, and the outer fitting portion. If the boundary between the joint portion 14 and the flange portion 15 is to be determined, for example, the inflection point of the blank 10 or the vicinity of the inflection point may be set as the respective boundary.

  For example, assume that the blank 10 is formed by drawing, and the top plate portion 11, the inner fitting portion 12, the top portion 13, the outer fitting portion 14, and the flange portion 15 are formed in the blank 10. In this case, as shown in FIG. 2, for example, the boundary between the top plate portion 11 and the inner fitting portion 12 occurs when the blank 10 is bent (squeezed) from the first direction X1 to the second direction Z2. It can be the inflection point P1. Thereby, the top plate 11 is defined from the inflection point P1 (not shown in FIG. 2) on the opposite side to the inflection point P1 shown in FIG.

  Similarly, the boundary between the inner fitting portion 12 and the top portion 13 can be an inflection point P2 generated when the blank 10 is bent (squeezed) from the second direction Z2 to the third direction X3. Thus, the inner fitting portion 12 is defined from the inflection point P1 to the inflection point P2.

  Similarly, the boundary between the top portion 13 and the outer fitting portion 14 can be an inflection point P3 generated when the blank 10 is bent (squeezed) from the third direction X3 to the fourth direction Z4. Thereby, the top 13 is determined from the inflection point P2 to the inflection point P3. The boundary between the outer fitting portion 14 and the flange portion 15 can be an inflection point P4 generated when the blank 10 is bent (squeezed) from the fourth direction Z4 in the fifth direction X5. Thus, the outer fitting portion 14 is defined from the inflection point P3 to the inflection point P4. The flange portion 15 is defined from the inflection point P4 to the end 10a.

  FIG. 3A is a schematic perspective view showing an example of a paper cover according to one embodiment of the present invention. FIG. 3B is a schematic perspective view of the schematic perspective view shown in FIG.

  As shown in FIGS. 3A and 3B, the inner surface of the inner fitting portion 12 of the paper cover 1 is connected to the top plate 11 (specifically, the inner fitting portion 12 and the top plate 11). There is no wrinkle 17 within a range of at least 3 mm from the boundary (inflection point P1) in the second direction Z2, and there is a wrinkle 17 exceeding 3 mm. Thereby, the wrinkles 17 are eliminated from the inner surface of the inner fitting portion 12 which is in contact with the inner peripheral surface 21 of the paper container 2. For this reason, when the paper lid 1 is fitted to the paper container 2, a gap that causes leakage of the contents is formed between the inner peripheral surface 21 of the container portion of the paper container 2 and the inner surface of the inner fitting portion 12. No longer occurs. Therefore, leakage of contents can be suppressed. On the other hand, wrinkles 17 exist on the outer surface of the inner fitting portion 12.

  The top 13 has many fine wrinkles 17 on both the inner surface and the outer surface. As a result, when the outer fitting portion 14 is molded, even if the blank 10 is pulled in the fourth direction Z4 (the direction opposite to the second direction Z2), the wrinkles 17 on the outer surface of the top portion 13 are elongated, and the top portion 13 is enlarged. Thus, the paper cover 1 can be molded without breaking the blank 10.

  Further, the outer fitting portion 14 has many fine wrinkles 17 on both the inner surface and the outer surface.

  The flange portion 15 has many fine wrinkles 17 on both the inner surface and the outer surface.

  FIG. 4A is a drawing substitute photograph showing the end of the flange portion 15. FIG. 4B is a schematic cross-sectional view showing the shooting direction of the drawing substitute photograph shown in FIG. FIG. 5A is a drawing substitute photograph showing the outer surface of the flange portion 15. FIG. 5B is a schematic cross-sectional view showing the shooting direction of the drawing substitute photograph shown in FIG.

  FIG. 4A shows a state of the distal end 10a of the flange portion 15 photographed from the photographing direction SD shown in FIG. 4B. In the flange portion 15, wrinkles 17 are formed at different positions on the outer surface side and the inner surface side. In other words, between the two adjacent wrinkles 17 on the outer surface side, one wrinkle 17 is included on the inner surface side, and between the two adjacent wrinkles 17 on the inner surface side, one wrinkle 17 is included on the outer surface side. I have.

  FIG. 5A shows a state of the outer surface of the flange portion 15 photographed from the photographing direction SD shown in FIG. 5B. The end 10a of the paper lid 1 has an irregular shape in the radial direction, and the corner 10e of the end 10a of the paper lid 1 also has an irregular shape. Thereby, even if it traces the end 10a, a hand or a finger is not cut, and the safe paper lid 1 can be provided.

  FIG. 6A is a schematic cross-sectional view taken along the line VIA-VIA in FIG. FIG. 6B is a schematic cross-sectional view taken along the line VIB-VIB in FIG. The VIA-VIA line and the VIB-VIB line in FIG. 1B are, for example, cutting lines that cut the paper lid 1 along a horizontal plane. FIG. 6A shows a cross section of a portion exceeding 3 mm from the inflection point P1 in the second direction Z2, and FIG. 6B shows a cross section of a portion within 3 mm.

  As shown in FIGS. 6A and 6B, the inner fitting portion 12 has a first outer surface 12e and an inner fitting surface 12f on a surface opposite to the first outer surface 12e. . The outer fitting portion 14 has a second outer surface 14e and an outer fitting surface 14f on a surface opposite to the second outer surface 14e. In the cross section of the paper lid 1 cut along the horizontal plane, each of the first outer surface 12e, the second outer surface 14e, and the outer fitting surface 14f has a wrinkle 17. The inner fitting surface 12f has no wrinkles 17 within a range of at least 3 mm from the inflection point P1 (FIG. 6B), and has wrinkles 17 exceeding 3 mm (FIG. 6A).

  Further, as shown in FIGS. 3A and 3B, the top 13 has a third outer surface 13e continuous with each of the first outer surface 12e and the second outer surface 14e. The paper lid 1 further includes a plurality of wrinkles 17 extending from the first outer surface 12e to the second outer surface 14e and straddling the third outer surface 13. The top portion 13 has a top inner surface (not shown) continuous with each of the inner fitting surface 12f and the outer fitting surface 14f, and the paper cover 1 has a plurality of straddling the top inner surface similarly to the third outer surface 13e. Wrinkles 17 are further included.

  The wrinkles 17 can be formed, for example, by applying a compressive force to the first outer surface 12e, the second outer surface 14e, and the third outer surface 13e when manufacturing the paper lid 1. Such wrinkles 17 are generated, for example, randomly on each of the first outer surface 12e, the second outer surface 14e, and the third outer surface 13e.

  Moreover, when manufacturing the paper lid 1, by molding the inner fitting portion 12, the top portion 13, and the outer fitting portion 14 in this order, at least within 3 mm from the top plate portion 11 of the inner fitting portion 12f, in other words. The wrinkles 17 can be prevented from being generated at a portion of the inner fitting surface 12f which comes into contact with the inner peripheral surface 21 of the container portion of the paper container 2.

  According to such a paper lid 1, since wrinkles 17 do not occur in the portion of the inner fitting surface 12f that comes into contact with the inner circumferential surface 21 of the container portion, the inner fitting surface 12f is in contact with the first outer surface 12e and the second outer surface 12e. As compared with the case where the wrinkles 17 are generated in the same manner as the outer surface 14e or the like, the advantage that the contents are less likely to leak when the paper container 2 falls down can be obtained.

  FIG. 7A is a schematic perspective view showing a state where the paper lids 1 are stacked. FIG. 7B is an enlarged schematic cross-sectional view showing each of the inner fitting portion 12 and the outer fitting portion 14 when the paper lids 1 are stacked.

  As shown in FIGS. 7A and 7B, when the paper lids 1 are stacked, a gap is formed between the first outer surface 12 e and the inner fitting surface 12 f by the wrinkles 17. For this reason, the contact ratio between the first outer surface 12e and the inner fitting surface 12f can be reduced as compared with the paper lid 1 having no wrinkles 17 on each of the first outer surface 12e and the inner fitting surface 12f. . Therefore, even if the paper lids 1 are stacked, it is possible to prevent the paper lids 1 in contact with each other from being fitted.

  When a gap due to the wrinkles 17 is further generated between the second outer surface 14e and the outer fitting surface 14f, the fitting of the paper lids 1 can be more strongly suppressed.

  According to the paper lid 1 according to such an embodiment, even if the paper container 2 falls down, the contents are unlikely to leak, and even when the paper lids 1 are stacked, it is possible to prevent the paper lids 1 from fitting each other. There is an advantage that there is.

Next, an example of a method for manufacturing a paper lid will be described.
(Manufacturing method of paper lid)
<Example of processing machine>
FIG. 8 is a schematic sectional view showing an example of a processing machine that can be used for manufacturing a paper lid according to one embodiment of the present invention.

  The processing machine 100 includes a draw die 110, a blank holder 120, a draw punch 130, and a plunger 140.

  The draw die 110 has a plunger guide hole 111 and a mounting surface 112. The plunger guide hole 111 is, for example, a circular hole. The mounting surface 112 is provided outside the plunger guide hole 111. The mounting surface 112 faces the blank holder 120. The mounting surface 112 is a surface on which the blank 10 can be mounted.

  The blank holder 120 has a punch guide hole 121 and a pressing surface 122. The punch guide hole 121 is a circular hole. The pressing surface 122 is provided outside the punch guide hole 121. The pressing surface 122 faces the mounting surface 112. The blank holder 120 holds the blank 10 placed on the placement surface 112.

  The draw punch 130 is movable in the punch guide hole 121 in the upward direction ZU and the downward direction ZD. Each of the ascending direction ZU and the descending direction ZD intersects, for example, is orthogonal to the mounting surface 112. The downward direction ZD is opposite to the upward direction ZU. An annular projection 131 is provided at the tip of the draw punch 130. The annular protrusion 131 protrudes from the punch surface 132 of the draw punch 130 into, for example, a surrounding wall shape. As a result, at the tip of the draw punch 130, a depression 133 surrounded by the annular projection 131 and having the punch surface 132 as the bottom is obtained. The annular protrusion 131 can be fitted to the inner peripheral surface of the plunger guide hole 111 with a clearance provided. The tip of the annular projection 131 is a curved surface.

  The plunger 140 is movable in the plunger guide hole 111 in each of the upward direction ZU and the downward direction ZD. A reduced diameter portion 141 is provided at the tip of the plunger 140. The diameter D1 of the reduced diameter portion 141 is smaller than the diameter D2 of the base diameter portion 142 of the plunger 140. The reduced diameter portion 141 can be fitted to the annular protrusion 131 with a clearance provided.

  The processing machine 100 is, for example, a press machine. For example, by using a processing machine 100 as shown in FIG. 8, the paper lid 1 provided with each of the inner fitting portion 12 and the outer fitting portion 14 can be manufactured from the blank 10.

  FIGS. 9, 10 (a) to 10 (d), and FIGS. 11 (a) to 11 (d) are schematic cross sections showing an example of a method for manufacturing a paper lid according to an embodiment of the present invention. FIG. FIGS. 9, 10 (a) to 10 (d), and FIGS. 11 (a) to 11 (d) show a schematic cross section of the blank 10 and a schematic cross section of the processing machine 100, respectively. .

  As shown in FIG. 9, the blank 10 is placed on the placement surface 112 of the draw die 110. In this description, the position of the mounting surface 112 is referred to as a reference position RP.

  Next, as shown in FIG. 10A, the blank holder 120 is moved in the downward direction ZD, and the peripheral area 10 b of the blank 10 is pressed by the pressing surface 122 of the blank holder 120.

  FIGS. 12A and 12B are schematic cross-sectional views showing the blank 10, the draw die, and the blank holder in a partially enlarged manner. FIG. 12A shows a state in which the blank 10 is placed on the placing surface 112, and FIG. 12B shows a state in which the peripheral region 10 b is pressed by the pressing surface 122.

  As shown in FIG. 12B, when the blank 10 is pressed by the pressing surface, a first clearance 151 is provided between the mounting surface 112 and the pressing surface 122. The width W1 of the first clearance 151 is set smaller than the paper thickness T10 of the blank 10 (FIG. 12A). As a result, the blank 10 is crushed, and it is possible to perform “wrinkle suppression” on the blank 10. Note that a load for “wrinkle suppression” may be applied to the blank holder 120, and the width W1 of the first clearance may be equal to or larger than the paper thickness T10 of the blank 10.

  Next, as shown in FIG. 10B, the draw punch 130 is moved in the downward direction ZD toward the blank 10. Thereby, the draw punch 130 is lowered so that, for example, the tip of the annular projection 131 almost reaches the reference position RP. Thereby, the tip of the annular projection 131 is in contact with or close to the surface of the blank 10. In the state shown in FIG. 10B, the central region 10c of the blank 10 is located between the draw punch 130 and the plunger 140.

  Next, as shown in FIG. 10C, the plunger 140 is moved in the upward direction ZU toward the blank 10. Thereby, the plunger 140 is raised so that the tip of the reduced diameter portion 141 exceeds the reference position RP. When the reduced diameter portion 141 exceeds, for example, the reference position RP, the reduced diameter portion 141 advances into the depression 133. As a result, the central region 10c of the blank 10 is pushed into the depression 133 by the reduced diameter portion 141. The pushing amount is about 10 mm in the present embodiment. Note that the pushing amount is variously changed depending on the size of the paper lid 1 and the use of the paper lid 1.

  In this way, the central region 10c is pressed into the depression 133 while the peripheral region 10b is pressed by the pressing surface 122. Thus, the inner fitting portion 12 can be formed in the central region 10c using "drawing molding" while "wrinkling suppressing" the peripheral region 10b.

  FIGS. 13A and 13B are schematic cross-sectional views showing the draw die 110, the blank holder 120, the annular protrusion 131, and the plunger 140 in a partially enlarged manner. FIG. 13A shows a state before pressing, and FIG. 13B shows a state during pressing.

  As shown in FIGS. 13A and 13B, the plunger guide hole 111 includes a curved surface processing portion 113, for example. The curved surface processing portion 113 is provided in a portion of the plunger guide hole 111 on the blank holder 120 side. The curved surface processing portion 113 has, for example, a curved surface that is convex toward each of the plunger guide hole 111 and the punch guide hole 121. The tip of the annular projection 131 has a curved surface that is convex toward the plunger guide hole 111.

  As shown in FIG. 13B, a second clearance 152 is provided between the reduced diameter portion 141 and the annular protrusion 131. The width W2 of the second clearance 152 is set to be equal to or smaller than the paper thickness T10 of the blank 10 (FIG. 12A) (W2 ≦ T10). Thus, the inner fitting portion 12 can be formed in the central region 10c by “ironing” while “wrinkling suppressing” the peripheral region 10b.

  In the present specification, “drawing molding” means that the clearance between the dies (the draw die 110, the blank holder 120, the draw punch 130, and the plunger 140) is equal to the paper thickness T10 of the blank 10 or the paper thickness. It is set to be larger than T10, and it is defined that the blank 10 is formed by passing through such a clearance. Also, “ironing” means that the clearance between the molds is set to be smaller than the paper thickness T10 at any one place, and the blank 10 is passed through such clearance and molded. Define.

  When forming the inner fitting portion 12 by using “draw-forming” or “ironing”, a first forming load F1 is applied to the plunger 140. The direction in which the first molding load F1 is applied is the upward direction ZU. One example of the value of the first molding load F1 is, for example, about 3 kN. The magnitude of the first molding load F1 is also variously changed according to the size of the paper lid 1 and the use of the paper lid 1. The first molding load F1 is applied to a plunger from a load machine (not shown). As an example of the load machine, a load machine that applies a load to an object via an elastic body can be given. An example of such a loader is an air cylinder. The air cylinder contains air as an elastic body. Note that the loader is also used as a moving mechanism that moves the plunger 140 in the ascending direction ZU or the descending direction ZD.

  Further, when the inner fitting portion 12 is formed by “ironing”, a compressive force C is applied to the first outer surface 12e, and a tensile force T is applied to the inner fitting surface 12f. For this reason, wrinkles 17 (see FIGS. 3A to 7B) approach the first outer surface 12 e, but at least 3 mm from the top plate 11 of the inner fitting surface 12 f. Does not come.

  Next, as shown in FIG. 10D, the draw punch 130 is moved in the downward direction ZD toward the blank 10. The downward direction ZD is opposite to the upward direction ZU. Thereby, the draw punch 130 is lowered so that the tip of the annular projection 131 exceeds the reference position RP. The draw punch 130 pushes the blank 10 together with the plunger 140 into the plunger guide hole 111. In the present embodiment, the pushing amount is about 10 mm from the reference position RP. Note that the pushing amount is variously changed depending on the size of the paper lid 1 and the use of the paper lid 1.

  In this way, the central region 10c is pushed into the plunger guide hole 111 together with the plunger 140 while the peripheral region 10b is pressed by the pressing surface 122. Thus, the outer fitting portion 14 can be formed in the central region 10c by using "drawing molding" while "wrinkling" the peripheral region 10b. The outer fitting portion 14 is formed, and the flange portion 15 is formed in the peripheral region 10b.

  FIG. 14 is a schematic cross-sectional view showing the draw die 110, the blank holder 120, the annular protrusion 131, and the reduced diameter portion 141 in a partially enlarged manner. FIG. 14 shows a state after the pressing or during the pressing.

  As shown in FIG. 14, a third clearance 153 is provided between the annular protrusion 131 and the plunger guide hole 111. The width W3 of the third clearance 153 is set to be equal to or smaller than the sheet thickness T10 of the blank 10 (FIG. 12A) (W3 ≦ T10). Thus, the outer fitting portion 14 can be formed in the central region 10c by “ironing” while “performing wrinkling” of the peripheral region 10b.

  When forming the outer fitting portion 14 using “drawing molding” or “ironing molding”, a second molding load F2 is applied to the draw punch 130. The direction in which the second molding load F2 is applied is the descending direction ZD. The direction in which the second molding load F2 is applied is opposite to the direction in which the first molding load F1 is applied. One example of the value of the second molding load F2 is, for example, about 6.5 kN. The magnitude of the second molding load F2 is also variously changed according to the size of the paper lid 1 and the use of the paper lid 1. The second molding load F2 is applied to a plunger from a load machine (not shown). As an example of the loader, a loader capable of mechanically applying a load to an object can be given. An example of such a loader is a servo press. The servo press includes a servo motor. The loader is also used as a moving mechanism for moving the draw punch 130 in the descending direction ZD or the ascending direction ZU. When a servomotor is used, for example, the draw punch 130 can be precisely controlled to descend in two stages. The first stage is a descent to the reference position RP, and the second stage is a more precise descent beyond the reference position RP to a final descent position. According to the servomotor, the draw punch 130 can be reliably stopped and held at the final lowering position.

  Also, even if the outer fitting portion 14 is formed using "ironing", wrinkles 17 are present on the second outer surface 14e and the outer fitting surface 14f (FIGS. 3A to 7B). reference).

  Further, since wrinkles 17 are located on the third outer surface 13 e of the top 13 and the inner surface of the top 13, even if the outer fitting portion 14 is formed using “ironing”, the wrinkles 17 of the top 13 are not formed. Becomes an extension allowance, and the outer fitting portion 14 can be formed without breaking the blank 10 at the top portion 13.

  The magnitude of the second molding load F2 may be larger than the first molding load F1. In this case, when the plunger 140 is supported by a moving mechanism or a loader including an elastic body such as an air cylinder, the plunger 140 can be pushed down by the difference between the second molding load F2 and the first molding load F1. it can. Therefore, the tip of the annular projection 131 can be pushed into the plunger guide hole 111 while maintaining the mold-clamped state (the state where the central region 10b is sandwiched between the draw punch 130 and the plunger 140). In addition, since the plunger 140 is pushed down by the draw punch 130, there is an advantage that the position control of the plunger 140 becomes unnecessary.

  When forming the outer fitting portion 14, the central region 10 c is pushed into the plunger guide hole 111 together with the plunger 140, while leaving the peripheral region 10 b between the placing surface 112 and the pressing surface 122. Thereby, the flange portion 15 can be formed in the peripheral region 10b of the paper lid 1. When the paper cover 1 is provided with the flange portion 15, the paper cover 1 can be removed in the step of removing the paper cover 1 as follows.

  As shown in FIG. 11A, the plunger 140 is moved in the downward direction ZD while pressing the flange portion 15 with the pressing surface 122. As a result, the plunger 140 is detached from the paper lid 1. The draw punch 130 is held at the final lowering position. Therefore, the draw punch 130 remains, for example, in contact with the central region 10c. If the draw punch 130 is held at the final lowering position, the paper cover 1 will not fall even if the plunger 140 is detached from the paper cover 1.

  Next, as shown in FIG. 11B, the blank holder 120 is moved in the upward direction ZU while holding the draw punch 130 at the final lowering position. Thereby, the blank holder 120 is detached from the paper lid 1. Next, the blank holder 120 is provided with a fourth clearance 154 between the flange portion 15 and the pressing surface 122 to be on standby.

  Next, as shown in FIG. 11C, the draw punch 130 is moved in the ascending direction ZU. At this time, the annular projection 131 often cuts into the annular recess 16. When the annular protrusion 131 bites into the annular recess 16, the paper cover 1 moves in the ascending direction ZU while being attached to the draw punch 130.

  Next, as shown in FIG. 11D, the draw punch 130 is further moved in the upward direction ZU. By moving the draw punch 130 further in the upward direction ZU, the flange portion 15 can be brought into contact with the pressing surface 122 again. The annular protrusion 131 is pulled out of the annular recess 16 while the flange 15 is supported by the pressing surface 122. Eventually, the paper lid 1 is detached from the draw punch 130. Thereby, the paper cover 1 is in a state where it can be removed from the processing machine 100.

  As described above, by forming the outer fitting portion 14 in the central region 10c while leaving the peripheral region 10b between the mounting surface 112 and the pressing surface 122, the flange portion 15 is formed in the paper lid 1. be able to. In addition, the blank holder 120 is provided with a fourth clearance 154 between the flange portion 15 and the pressing surface 122 to stand by, and the flange portion 15 is brought into contact with the pressing surface 122 again. Even if the paper cover 1 is cut into the annular recess 16, the paper cover 1 can be easily removed from the draw punch 130. For example, it is not necessary to provide the draw punch 130 with a removal mechanism such as a knockout for detaching the paper cover 1.

  According to such a manufacturing method, the top plate portion 11, the inner fitting portion 12, the top portion 13, the outer fitting portion 14, and the flange portion 15 can be formed on the paper lid 1.

  Hereinafter, an example of the paper cover 1 will be described in more detail.

    <Flange part>

  FIG. 15A is a schematic cross-sectional view illustrating a paper cover according to the reference example. FIG. 15B is a schematic cross-sectional view illustrating an example of a paper cover according to an embodiment of the present invention. The cross sections shown in FIGS. 15A and 15B correspond to, for example, the cross section shown in FIG.

  As shown in FIG. 15A, in the paper lid 1 a according to the reference example, the outer fitting portion 14 includes the end 10 a of the paper lid 1. That is, the paper lid 1 has no flange portion 15. The end 10a is a free end. For this reason, since a force for returning to the original shape acts on the outer fitting portion 14 due to the residual stress, the outer fitting portion 14 is easily opened outward. Therefore, the paper lid 1a is easily detached from the paper container 2.

  As shown in FIG. 15B, the paper cover 1 according to one embodiment has a flange portion 15, and the flange portion 15 includes the end 10 a. The terminal end 10a is a free end similarly to the reference example. However, in the paper lid 1, the shoulder portion 18 exists in the entire circumferential direction from the outer fitting portion 14 to the flange portion 15. The shoulder 18 is, for example, squeezed and shrunk. Since the force that stays in the same shape acts on the contracted shoulder portion 18, it acts as a suppressing force against the force of the outer fitting portion 14 trying to return to the original shape. Further, the flange portion 15 of the paper lid 1 has a wrinkle 17 which is compressed and further crushed due to a wrinkle suppressing effect. Due to the wrinkles 17, a force acting on the flange portion 15 in the same shape acts. Further, since the flange portion 15 is provided in the entire circumferential direction, the flange portion 15 serves as a force for fixing the entire circumference, and acts as a suppressing force against the force of the outer fitting portion 14 returning. Therefore, the paper lid 1 is less likely to open outward, and is less likely to come off the paper container 2 than the paper lid 1a.

  Further, even if the paper container 2 is fitted into the annular concave portion 16 and the outer fitting portion 14 is once opened, the narrowed shoulder portion 18 tends to return to the shape after molding. It is stronger than the terminal 10a of 1a. Therefore, compared to the paper lid 1a, the fitting force of the paper lid 1 is less likely to decrease even when the paper lid 1 is repeatedly attached to and detached from the paper container 2.

  According to the paper cover 1, since each of the inner fitting portion 12 and the outer fitting portion 14 is provided, compared with a paper cover having only the inner fitting portion 12 or only the outer fitting portion 14, It is possible to fit the paper container 2 more firmly. Since the paper lid 1 is provided with the flange portion 15, the paper lid 1 is less likely to be detached from the paper container 2 than a paper lid without the flange portion 15.

  Further, even if the paper container 2 is fitted into the annular concave portion 16 and the outer fitting portion 14 is once opened, the narrowed shoulder portion 17 tends to return to the shape after molding. It is stronger than the terminal 10a of 1a. Therefore, compared to the paper lid 1a, the fitting force of the paper lid 1 is less likely to decrease even when the paper lid 1 is repeatedly attached to and detached from the paper container 2.

  According to the paper cover 1, since each of the inner fitting portion 12 and the outer fitting portion 14 is provided, compared with a paper cover having only the inner fitting portion 12 or only the outer fitting portion 14, It is possible to fit the paper container 2 more firmly. Since the paper lid 1 is provided with the flange portion 15, the paper lid 1 is less likely to be detached from the paper container 2 than a paper lid without the flange portion 15.

<Slope shape>
FIG. 16 is a schematic cross-sectional view showing an example of the paper cover according to one embodiment of the present invention. The cross section shown in FIG. 16 corresponds to, for example, the cross section shown in FIG.

  As shown in FIG. 16, in the paper cover 1 according to one embodiment, at least a part of the outer fitting portion 14 has an inclined portion 14 a inclined toward the inner fitting portion 12. In the paper lid 1, the inclined portion 14a is provided over the entire periphery of the outer fitting portion 14.

  FIGS. 17A to 17C are schematic cross-sectional views illustrating an example of a paper cover according to an embodiment in the order of manufacturing steps.

  As shown in FIG. 17A, when only the inner fitting portion 12 is "drawn", the skirt portion of the blank 10 (corresponding to the peripheral region 10b, for example) due to the residual stress after being removed from the mold. , Usually open out (try to return to its original flat shape).

  Next, as shown in FIG. 17B, when the inner fitting portion 12 and the outer fitting portion 14 are molded, after the inner fitting portion 12 and the outer fitting portion 14 are removed from the mold, the inner fitting portion 12 tends to open outward. The skirt 14b of the outer fitting portion 14 relatively enters below the top portion 13. Here, if there is no flange portion 15, the outer fitting portion 14 tends to return to the shape shown in FIG. For this reason, the hem 14 b that has once entered below the top 13 exits from below the top 13. The state in which the skirt 14b enters below the top 13 cannot be maintained.

  Therefore, as shown in FIG. 17C, the skirt 14b is left in a flange shape, and the flange portion 15 is formed on the paper lid 1. Due to the effect of suppressing wrinkles, the flange portion 15 has wrinkles that are compressed and further crushed. Since the flange portion 15 is compressed, a force acts on the flange portion 15 to remain in the same shape. Further, since the flange portion 15 is provided in the entire circumferential direction, it serves as a force for fixing the entire circumference, so that the outer fitting portion 14 is prevented from returning to the shape shown in FIG. Is done. However, no force is exerted on the upper portion 14c of the outer fitting portion 14 to suppress the outward force. For this reason, the upper part 14c opens outside. Conversely, a force that suppresses the force of opening outward acts on the lower portion 14 d of the outer fitting portion 14 by the flange portion 15. For this reason, it becomes difficult for the lower part 14d to open outward. As a result, the state where the skirt 14b enters below the top 13 is maintained. Thereby, the inclined portion 14 a can be provided to the outer fitting portion 14, and the inner fitting portion 12 can be inclined toward the outer fitting portion 14.

  According to such a paper lid 1, since the outer fitting portion 14 has the inclined portion 14a, the paper lid 1 is more firmly fitted to the paper container 2 as compared with a paper lid without the inclined portion 14a. Can be done. Therefore, the paper cover 1 can be made harder to come off from the paper container 2.

  The inclined portion 14a has a curved surface protruding toward the inner fitting portion 12 side. According to such a paper lid 1, the curved surface of the inclined portion 14a fits the fingertip of a person, so that the paper lid 1 is easily held. Therefore, even if the paper lid 1 is firmly fitted to the paper container 2, the advantage that the paper lid 1 can be easily removed from the paper container 2 can be further obtained.

  Further, by providing the inclined portion 14a over the entire circumference of the outer fitting portion 14, the fitting of the paper cover 1 and the paper container 2 can be performed as compared with a paper cover in which the inclined portion 14a is not provided on the entire circumference of the outer fitting portion 14. The resultant force can be further enhanced.

  As shown in FIG. 16, in the paper lid 1 according to the embodiment, in the sixth direction Z6 orthogonal to the first direction X1, the position P11 of the top plate 11 is different from the position P13 of the top 13 and the flange P15. Between position P15.

  According to such a paper lid 1, even when the paper lid 1 is placed on the table 3, for example, the container surface 11b does not contact the table surface 31. Such a paper lid 1 is sanitary.

  In addition, the top 13 includes a curved surface that is convex in the second direction Z2. Such a top portion 13 presses the outer fitting portion 14 against the curl portion 22 (see FIG. 2) after the curl portion 22 enters the annular concave portion 16. For this reason, the paper cover 1 can be more firmly fitted to the paper container 2.

<Relationship between height of inner fitting portion 12 and outer diameter of outer fitting portion 14>
FIG. 18A is a schematic cross-sectional view illustrating an example of a paper cover according to an embodiment of the present invention. FIG. 18B is a schematic cross-sectional view illustrating a paper container that can be fitted to an example of a paper cover according to an embodiment of the present invention.

  It is assumed that the contents contained in the paper container 2 are liquid, and the paper container 2 containing the liquid is covered with the paper cover 1. Under this assumption, when the paper container 2 falls down, for example, if the depth of the inner fitting portion 12 is small, the liquid may leak out. Therefore, the inventors examined the height of the inner fitting portion 12 at which the liquid hardly leaks even if the paper container 2 is collapsed or left for a long time in the collapsed state.

  As shown in FIGS. 18A and 18B, the height H of the inner fitting portion 12 is a height H from the top surface 11 a of the top plate portion 11 to the top of the top portion 13. Originally, the height of the inner fitting portion 12 should be the height of the portion that actually functions as a seal (from the deepest contact point where the inner fitting portion 12 contacts the container inner peripheral surface 21 to the curl portion 22). Vertex) should be chosen. However, as can be determined from the paper cover 1, the height of the inner fitting portion 12 is set as described above for convenience. Although the height H is different from the height of the portion actually functioning as the seal, the difference is small and substantially equal.

  FIG. 19 is a diagram showing the relationship between the taper angle θ and the ratio P. The taper angle θ is an angle at which the side surface of the paper container 2 opens outward. The taper angle θ is, for example, an inclination angle of the paper container 2 from the perpendicular 24 to the container bottom plate 23. The ratio P is a ratio of the height H to the outer diameter D of the outer fitting portion 14 (P = (H / D) × 100%).

  As shown in FIG. 19, the inventors performed a leak test of the paper lid 1 for each taper angle θ. The content is coffee (temperature 5 ° C. ± 2 ° C.). The inclination angle of the paper container 2 is 90 ° (side down). The paper container 2 accommodating the contents was held for 60 seconds in a state of being tilted by 90 °.

In the leak test, the contents take the following three states.
Poor: leak
Good: Slight bleeding is observed in the annular concave portion 16, but does not leak out
Excellent: Neither leakage nor bleeding When the paper lid 1 is in the state “Good” or “Excellent”, the leakage of the contents can be suppressed even if the paper container 2 falls down, and the paper lid 1 is more practical. It will be.

A plot point (indicated by “◇”) shown in FIG. 19 is a ratio P when the state becomes “Good”.
When the taper angle θ was about 4 ° 15 ′, the state became “Good” when the ratio P was about 23.8% (see “i”).
When the taper angle θ was about 5 °, the state became “Good” when the ratio P was about 17.1% (see “ii”).
When the taper angle θ was about 6 ° 15 ′, the state became “Good” at the ratio P of about 13.1% (see “iii”).
When the taper angle θ was about 7 ° 30 ′, the state became “Good” when the ratio P was about 7.7% (see “iv”).

  The leak test is performed over a long time of 60 seconds. Therefore, in actual use, the ratio P may be acceptable from the above value up to, for example, about -2%.

  From the result of the leak test, the ratio P (P = (H / D) × 100%) of the height H to the outer diameter D of the outer fitting portion 14 is, for example, at least about 6%, and the paper container 2 Even if it falls down, it is possible to suppress leakage of the contents.

  In this manner, the paper cover 1 having the ratio P of at least 6% is manufactured, and the paper container 2 that matches the paper cover 1 may be selected.

  The ratio P can be equal to or more than the above value. For example, when the taper angle θ is about 7 ° 30 ′ and the ratio P is increased to about 11.6%, the state of the contents can be changed from the state “Good” to the state “Excellent” (see “v”). When the state becomes “Excellent”, it is possible to obtain the paper lid 1 that can suppress each of leakage and bleeding even when the paper container 2 falls down. A common sense value may be selected as the upper limit of the ratio P. In one example, the upper limit of the proportion P will be about 100%. In this case, the height H is substantially equal to the outer diameter D.

<Combination of paper lid 1 and paper container 2>
From the leak test, it was confirmed that as the taper angle θ approaches 0 °, the ratio P that can be changed from the state “Poor” to the state “Good” tends to increase. In order to optimize the combination of the paper lid 1 and the paper container 2, for example, the following may be performed.

Assuming that the taper angle of the container fitted to the paper lid 1, for example, the paper container 2, is θ, the value of the ratio P (P = (H / D) × 100) is given by the following equation (1): P = −4θ + 36 (1)
Is selected.

  As described above, by selecting the ratio P of the paper cover 1 according to the taper angle θ of the paper container 2, it is possible to select the optimum paper cover 1 for the paper container 2.

<Relationship between Outer Diameter D22 of Paper Container 2 and Outer Diameter D of Outer Fitting Portion 14>
The outer diameter D22 of the mouth of the paper container 2 may be larger than the outer diameter D of the outer fitting portion 14. In this case, the outer diameter D15 of the flange portion 15 is preferably larger than the mouth outer diameter D22.

  Furthermore, when the flange portion 15 is placed on a flat surface, for example, on the table 3, it is preferable that the flange portion 15 stand up from the table surface 31 (see FIG. 16). That is, as shown in FIG. 18, the fifth direction X5 in which the flange portion 15 extends extends in a direction intersecting with the imaginary line 10 d connecting the ends 10 a of the paper lid 1 and toward the paper container 2. In this way, even if the mouth outer diameter D22 is larger than the outer diameter D, the flange portion 15 guides the curl portion 22 into the annular concave portion 16. The flange portion 15 serves as a guide for the curl portion 22. As described above, by fitting the paper container 2 having the mouth outer diameter D22 larger than the outer diameter D with the outer fitting portion 14, the outer fitting force of the paper lid 1 can be further increased.

  Further, the top 13 preferably includes a curved surface that is convex in the second direction Z2. By including such a curved surface in the top portion 13, when the curl portion 22 is guided into the annular concave portion 16 by the flange portion 15, the outer fitting portion 14 is easily opened outward. For this reason, the paper lid 1 is easily attached to the paper container 2.

  Moreover, the top portion 13 including the curved surface protruding in the second direction Z <b> 2 presses the outer fitting portion 14 against the curl portion 22 after the curl portion 22 enters the annular concave portion 16. For this reason, the paper cover 1 can be more firmly fitted to the paper container 2.

  The paper lid 1 is used, for example, as a lid of the paper container 2. For example, the paper container 2 may contain a liquid. For this reason, the paper used for the paper lid 1 is preferably water-repellent paper or paper whose surface has been subjected to water-repellent processing. Further, laminated paper in which a resin is laminated on a paper surface, coated paper coated with a resin, or the like may be used. However, the paper used for the paper lid 1 can be appropriately changed according to the needs of the consumer. Therefore, the paper used for the paper lid 1 is not limited to paper having water repellency or paper whose surface has been subjected to water repellency. The top plate 11 of the paper cover 1 may be provided with a hole for a drinking spout.

  According to such an embodiment of the present invention, the inner fitting portion can prevent the contents in the container, for example, the paper container 2 from leaking, and can prevent the paper covers 1 from being fitted into each other. Paper cover 1 provided with each of 12 and outer fitting part 14 can be provided.

  As described above, one embodiment of the present invention has been described. However, the above-described embodiment is presented as an example, and is not intended to limit the scope of the invention. Further, the embodiment of the present invention is not the only one embodiment. The present invention can be embodied in various novel forms other than the one embodiment. Therefore, the above embodiment can be variously omitted, replaced, or changed without departing from the gist of the present invention. Such new forms and modifications are included in the scope and gist of the present invention, and are also included in the scope of the invention described in the claims and the equivalents of the invention described in the claims.

1: paper lid 10: blank 10a: end 10b: peripheral area 10c: central area 10d: virtual line 10e: corner 11: top plate 11a: top surface 11b: container surface 12: inner fitting portion 12e: first outer Surface 12f: Inner fitting surface 13: Top 13e: Third outer surface 14: Outer fitting portion 14a: Inclined portion 14b: Hem 14c: Upper portion of outer fitting portion 14d: Lower portion of outer fitting portion 14e: Second outer portion Surface 14f: Outer fitting surface 15: Flange part 16: Annular concave part 17: Wrinkle 18: Shoulder part 1a: Paper cover (reference example)
2: paper container 21: inner peripheral surface of container portion 22: outer peripheral surface of curl portion 23: container plate bottom plate 3: table 31: table surface 100: processing machine 110: draw die 111: plunger guide hole 112: mounting surface 113: curved surface processing Part 120: Blank holder 121: Punch guide hole 122: Pressing surface 130: Draw punch 131: Annular protrusion 131a: Curved surface 132: Punch surface 133: Depression 140: Plunger 141: Reduced diameter part 142: Base diameter part 151: First 1 clearance 152: second clearance 153: third clearance OEP: peripheral portion X1: first direction Z2: second direction X3: third direction Z4: fourth direction X5: fifth direction Z6: sixth direction F1: first direction Molding load F2: Second molding load ZU: Upward direction ZD: Downward direction C: Compressive force T: Tensile force D1: Reduced diameter portion 1 1, the diameter D2: the diameter T10 of the base diameter portion 142: the paper thickness W1: the width W1 of the first clearance W2: the width W2 of the second clearance W3: the width RP of the third clearance RP: the reference position P11: the position P13 of the top plate portion: the top portion P15: Position of flange portion H: Height from top surface 11a to vertex 13a D: Outer diameter of outer fitting portion D22: Outer diameter of paper container 2 D15: Outer diameter of flange portion P: Ratio SD : Shooting direction

Claims (3)

A paper lid mainly made of paper,
The paper lid is
A top plate extending in the first direction;
A first outer surface and an inner fitting surface which is provided along a circumferential direction of the top plate portion and extends in a second direction intersecting the first direction, and which is on a surface opposite to the first outer surface; And an inner fitting portion continuous with the top plate portion,
A top portion provided along a circumferential direction of the inner fitting portion, extending in a third direction intersecting the second direction, and being continuous with the inner fitting portion;
An outer fitting surface is provided along a circumferential direction of the top portion, extends in a fourth direction intersecting the third direction, and has a second outer surface and an outer fitting surface on a surface opposite to the second outer surface. An outer fitting portion facing away from the inner fitting portion and continuous with the top portion,
Including
In a cross section obtained by cutting the paper lid along a horizontal plane,
A paper lid, wherein each of the first outer surface and the second outer surface has a wrinkle. The top has a third outer surface continuous with each of the first outer surface and the second outer surface,
The paper cover further includes a plurality of wrinkles extending from the first outer surface to the second outer surface and straddling the third outer surface.
The paper cover according to claim 1, wherein: The paper lid is
A flange portion provided along a circumferential direction of the outer fitting portion, extending in a fifth direction intersecting the fourth direction, continuing with the outer fitting portion, and including a distal end of the paper cover;
The paper cover according to claim 1, further comprising: