JP2021191699A - Paper-made container with lid - Google Patents

Abstract

To provide a practical paper-made lid and paper-made container with the lid capable of obtaining sufficient shape retention and strength.SOLUTION: A paper-made lid of the invention is formed by press molding from one sheet of a paper board to fit the size of the opening of the container main body having the opening in the upper part, and has a bottom part 11, a sidewall part 12 connected to the bottom part 11, a flange part 13 connected to the sidewall part 12 and extending in the substantially horizontal direction in the outward direction, and an edge winding part 14 formed on the outer peripheral edge of the flange part 13. With such a configuration, since sufficient shape retention and strength can be obtained by the edge winding part and the flange part, the practical paper-made lid can be provided.SELECTED DRAWING: Figure 7

Description

The present invention relates to a paper lid and a container with a paper lid composed of a paper lid and a container body, and more particularly to a paper lid and a container with a paper lid formed by press molding.

Conventionally, as a lightweight and cost-effective packaging container for food, a plastic container made of a synthetic resin such as polypropylene has been useful. Since plastic containers are easy to use, they are often used as containers for lunch boxes and the like.

However, since plastic containers have problems such as separation of garbage and resource saving of petroleum raw materials, paper containers that can be disposed of as combustible garbage and can save resources of petroleum raw materials are being adopted.

Therefore, conventionally, a paper container manufactured by press-molding a paperboard base paper has been proposed (Patent Document 1 and Patent Document 2). These paper containers are made by press-molding one sheet of paperboard base paper, and the outer peripheral edge is edge-wrapped.

Japanese Unexamined Patent Publication No. 10-43027 Japanese Unexamined Patent Publication No. 10-7165

However, in these prior arts, the container body is made of paper rather than plastic, while the lid is still made of plastic (see, for example, FIG. 16 of Patent Document 1 and FIG. 23 of Patent Document 2). .. For this reason, in such a conventional paper container with a lid, the lid and the container body must be separated and disposed of, and the problem of separating dust still remains.

Further, if the lid is also made of paper, the lid and the paper container have the same texture, so that a sense of design unity as a whole packaging container can be obtained.

As described above, it has been desired that the lid is also made of paper, but the paper lid may not be sufficient in terms of shape retention and strength, especially when it is manufactured by press molding of paperboard base paper. No one has been proposed that is easy to use and practical.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a practical paper lid and a container with a paper lid, which can obtain sufficient shape retention and strength.

In order to achieve the above object, the invention according to claim 1 is a paper lid formed by press molding from a single paperboard base paper according to the size of the opening of the container body having an opening at the top. It is provided with a bottom portion, a side wall portion connected to the bottom portion, a flange portion connected to the side wall portion and extending substantially horizontally in the outward direction, and a rim winding portion formed on the outer peripheral edge of the flange portion. be.

With this configuration, sufficient shape retention and strength can be obtained by the edge winding portion and the flange portion.

In the invention according to claim 2, in the configuration of the invention according to claim 1, the horizontal width of the flange portion is set to a size of 1/5 times or more and 1 times or less the diameter of the edge winding portion. It is something that is.

With this configuration, when the paper lid is stacked on the container body, the degree of protrusion of the edge winding portion of the paper lid to the outside of the container body can be suppressed as much as possible.

The invention according to claim 3 has a size in which the side wall portion extends downward from the upper end of the container body when it is put on the container body in the configuration of the invention according to claim 1 or 2. The angle θ formed by the lower surface of the flange portion and the outer surface of the side wall portion is 95 ° or more and 120 ° or less.

With this configuration, the side wall portion of the paper lid is formed at an angle close to vertical.

The invention according to claim 4 is the configuration of the invention according to any one of claims 1 to 3, wherein the flange portion is located above the lower end of the edge winding portion, and the lower end of the flange portion and the lower end of the edge winding portion. The distance is 1/5 times or more and 1/2 times or less the diameter of the edge winding portion.

With this configuration, a space defined by the flange portion and the side wall portion is formed on the inner side of the edge winding portion.

The invention according to claim 5 has a height of a side wall portion of 5 mm or more and 12 mm or less in the configuration of the invention according to any one of claims 1 to 4.

With this configuration, when the paper lid and the container body are overlapped, the side wall portion of the paper lid and the side wall of the container body are often caught, while the decrease in the storage capacity can be suppressed.

The invention according to claim 6 comprises the configuration of the invention according to any one of claims 1 to 5, wherein the bottom portion has a convex bulging portion bulging upward.

With this configuration, a space is provided in which the bottom of the paper lid is convex upward.

The invention according to claim 7 is the configuration of the invention according to claim 6, wherein the bottom portion is substantially horizontal from the connection portion with the side wall portion to the peripheral edge of the bulge portion between the connection portion with the side wall portion and the bulge portion. It is provided with a first flat portion extending to.

With this configuration, the bulge acts like a rib.

The invention according to claim 8 is a paper container in which the container body is formed by combining and bonding and pressing the paperboard base paper of the bottom plate and the side plate in the configuration of the invention according to claim 7, and is the first flat portion. The width of is set to be 10 times or more and 20 times or less the thickness of the paperboard base paper constituting the paper container.

With this configuration, the combined portion of the bottom plate and side plate becomes the leg of the container body, and when a plurality of containers with paper lids on which the paper lid and the container body are stacked are stacked, the paper lids stacked on top of each other are stacked. The entire leg of the container body of the attached container can be installed on the first flat portion of the lid of the container with a paper lid located below, and the width of the first flat portion is predetermined according to the base paper. Since it fits within the range, lateral deviation can be suppressed.

The invention according to claim 9 comprises the configuration of the invention according to any one of claims 6 to 8, wherein the bulging portion includes a second flat portion extending substantially horizontally in the central portion.

With this configuration, the height of the central portion of the bulging portion can be suppressed as compared with the case where the bulging portion is projected upward without providing the second flat portion.

The invention according to claim 10 is the invention according to any one of claims 1 to 9, wherein the shape in a plan view is formed into a substantially circular shape, a substantially elliptical shape, or a substantially oval shape. Is.

With this configuration, the shape of the paper lid in a plan view becomes a substantially circular shape, a substantially elliptical shape, or a substantially oval shape, which is often used as the shape of the container body.

The invention according to claim 11 is a container with a paper lid composed of the paper lid according to any one of claims 1 to 10 and a corresponding paper container main body.

With this configuration, it is possible to unify the materials of the lid and the container.

As described above, the invention according to claim 1 is a practical paper lid because sufficient shape retention and strength can be obtained.

The invention according to claim 2 has, in addition to the effect of the invention according to claim 1, the degree of protrusion of the edge winding portion of the paper lid to the outside of the container body when the paper lid is placed on the container body. As much as possible, the size of the entire container with a paper lid can be made compact, and the lateral displacement between the paper lid and the container body can also be reduced.

In the invention according to claim 3, in addition to the effect of the invention according to claim 1 or 2, since the side wall portion of the paper lid is formed at an angle close to vertical, the paper lid is overlapped with the container body. Sometimes, even when a lateral force is applied to the paper lid, the side wall of the paper lid gets caught in the opening of the container body, which causes the paper lid to unintentionally come off from the container body. Can be suppressed.

In the invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, a space defined by a flange portion and a side wall portion is formed on the inner side of the edge winding portion. Therefore, if the upper end of the opening of the container body has a width equal to or less than that of the flange, the upper end of the opening of the container body is on the inner side of the edge winding part of the paper lid. Since it enters the space, the height when the paper lid and the container body are overlapped can be suppressed.

The invention according to claim 5 has the effect of the invention according to any one of claims 1 to 4, and when the paper lid and the container body are overlapped with each other, the side wall portion of the paper lid and the container body Since the side wall is often caught and the reduction in storage capacity can be suppressed, it is made of paper unintentionally even when lateral force is applied to the side wall of the paper lid and the side wall of the container body. It is possible to prevent the lid from coming off, and it is also possible to reduce the lateral displacement of the paper lid from the container body.

The invention according to claim 6 has, in addition to the effect of the invention according to any one of claims 1 to 5, a space in which the bottom of the paper lid is convex upward, so that the paper lid and the container body are provided. When and are overlapped, the substantial capacity of the container body can be increased. Also, when used as a lid for a container with a paper lid that stores food such as for lunch, the paper lid can be turned over and the food can be stored in the bulge so that it can also be used as a dish for eating and drinking. Become.

In the invention according to claim 7, in addition to the effect of the invention according to claim 6, since the bulging portion acts like a rib, the horizontal strength of the paper lid can be improved.

The invention according to claim 8 has, in addition to the effect of the invention according to claim 7, a paper lid stacked on top of a plurality of containers with a paper lid in which a paper lid and a container body are stacked. The entire leg of the container body of the attached container can be installed on the first flat portion of the lid of the container with a paper lid located below, and the width of the first flat portion is predetermined according to the base paper. Since it fits within the range, it is possible to suppress lateral displacement, and the stability during stacking is further improved.

The invention according to claim 9 has, in addition to the effect of the invention according to any one of claims 6 to 8, a case where the bulging portion is projected upward without providing the second flat portion. Since the height of the central part of the bulging part can be suppressed, the bulging part of the paper lid becomes the container body when a plurality of containers with a paper lid on which the paper lid and the container body are stacked are stacked. It is possible to avoid contact with the bottom surface of the paper as much as possible, and even if it touches, it is flat, so the stacked state is stable.

In the invention according to claim 10, in addition to the effect of the invention according to any one of claims 1 to 9, the shape of the paper lid in a plan view is a substantially circular shape often used as the shape of the container body. Since it can be adapted to a substantially elliptical shape or a substantially oval shape, the shape of the paper lid can be preferably adapted to the shape of a common container body.

The invention according to claim 11 has the effect of the invention according to any one of claims 1 to 10, and can unify the materials of the lid and the container. Therefore, both the paper lid and the container body are made of ordinary paper. It will be possible to dispose of it as garbage and incinerate it. Moreover, since the lid and the container have the same texture, a sense of design unity is obtained as a whole.

It is a top view which shows the appearance shape of the container with a paper lid by 1st Embodiment of this invention. It is a partial cross-sectional view of the II-II line shown in FIG. It is a top view which shows the appearance shape of the container body which the container with a paper lid shown in FIG. 1 has. It is a partial cross-sectional view of the IV-IV line shown in FIG. It is a top view which shows the appearance shape of the paper lid provided in the container with a paper lid shown in FIG. 1. It is a partial cross-sectional view of the VI-VI line shown in FIG. It is an enlarged view of the P11 part shown in FIG. It is a schematic diagram which showed one process of the manufacturing method of a paper lid. It is a schematic diagram which showed the edge winding forming process which follows the process shown in FIG. It is a schematic diagram which showed an example for comparison with the process shown in FIG. 8 and FIG. It is an enlarged view of the P1 part shown in FIG. It is a figure which shows the dimensional relationship when the width in the horizontal direction of a flange part is set more than 1 times the diameter of a rim winding part. It is a figure which shows the dimensional relationship when the flange part is formed below the lower end of the edge winding part. It is a figure which shows the laminated body obtained by stacking the container with a paper lid in the vertical direction. It is an enlarged view of the P3 part shown in FIG. It is a figure which shows the laminated body obtained by stacking a paper lid in the vertical direction. It is an enlarged sectional view which shows the structure of the container with a paper lid by 2nd Embodiment of this invention, and corresponds to FIG. 7. It is an enlarged sectional view which shows the structure of the container with a paper lid by the 3rd Embodiment of this invention, and corresponds to FIG. 7.

FIG. 1 is a plan view showing an external shape of a container with a paper lid according to the first embodiment of the present invention, and FIG. 2 is a partial cross-sectional view of the II-II line shown in FIG.

With reference to the figure, the paper container 1 with a lid is composed of a paper lid 10 and a corresponding paper container body 30.

The paper lid 10 and the container body 30 are each formed to have a substantially oval shape in a plan view.

Hereinafter, each configuration will be described in detail in the order of the container body 30 and the paper lid 10.

FIG. 3 is a plan view showing the external shape of the container body included in the container with a paper lid shown in FIG. 1, and FIG. 4 is a partial cross-sectional view of the IV-IV line shown in FIG.

With reference to these figures, the container body 30 has a substantially oval bottom 31 in a plan view, a side wall portion 32 connected to the peripheral edge of the bottom portion 31, and an edge formed at the upper end of the side wall portion 32. It is connected to the peripheral edge of the winding portion 33 and the bottom portion 31, has a leg portion 34 extending downward, and has an opening 35 above.

The width W31, depth D31, and height H31 of the container body 30 are set to 147.6 mm, 102.6 mm, and 41 mm, respectively.

Such a container body 30 can be manufactured, for example, by using the technique described in Japanese Patent Application Laid-Open No. 2013-35168, combining the base papers of the bottom plate and the side plates, and adhering and pressing them.

That is, the container body 30 is formed by bonding a side plate base paper punched into a substantially cylindrical shape having an oval shape in a plan view by rolling and a bottom plate base paper punched into a substantially oval shape by pressing. A rim roll is formed. Further, the portion bonded by combining the bottom plate and the side plate becomes the leg portion 34 of the container main body 30.

The base paper for the side plate and bottom plate is ^{a thick paper with a grain size of 260 to 300 g / m 2} laminated with a polypropylene (PP) resin film (thickness: 20 μm) on both sides, or polybutylene terephthalate on the inner surface side thereof. (PBT) A resin film (thickness: 25 μm) laminated and punched out from a sheet having a thickness of about 0.3 to 0.4 mm can be used.

5 is a plan view showing the external shape of the paper lid included in the container with a paper lid shown in FIG. 1, and FIG. 6 is a partial cross-sectional view of the VI-VI line shown in FIG. 7 is an enlarged view of the P11 portion shown in FIG.

With reference to these figures, the paper lid 10 is formed by press molding from a single paperboard base paper and has a substantially oval shape in a plan view. In the production of the paper lid 10, the paperboard base paper as described above can be used.

The paper lid 10 is connected to the bottom portion 11 and the peripheral edge of the bottom portion 11 and is connected to the side wall portion 12 extending upward, the flange portion 13 connected to the side wall portion 12 and extending substantially horizontally in the outward direction, and the flange portion 13. It is provided with a flange winding portion 14 formed on the outer peripheral edge of the paper.

As described above, by providing the edge winding portion 14 and the flange portion 13, sufficient shape retention and strength are obtained, so that a practical paper lid can be obtained.

Further, the bottom portion 11 has a convex-shaped bulging portion 22 that bulges upward, and a bulging portion 22 from a connecting portion with the side wall portion 12 between the connecting portion with the side wall portion 12 and the bulging portion 22. The bulging portion 22 includes a first flat portion 21 extending substantially horizontally toward the peripheral edge, and the bulging portion 22 includes a second flat portion 23 extending substantially horizontally in the central portion.

The dimensional relationship of the paper lid 10 will be described below.

The width W11, depth D11, and height H11 of the paper lid 10 are set to 163.0 mm, 120.0 mm, and 10.65 mm, respectively.

With reference to FIG. 7, the horizontal width W12 of the flange portion 13 is set to 1.5 mm, and the edge winding diameter W13 of the edge winding is set to 3.0 mm. That is, the width W12 is set to be 1/2 times the size of the edge winding diameter W13.

The angle θ formed by the lower surface of the flange portion 13 and the outer surface of the side wall portion 12 is set to 95 °.

The flange portion 13 is located above the lower end of the edge winding portion 14, and the distance W14 between the lower end of the flange portion 13 and the lower end of the edge winding portion 14 is 1/5 or more and 1/2 times the diameter of the edge winding portion 14. It has the following length.

The width W15 of the first flat portion 21 is 5.0 mm, and is set to be 10 times or more and 20 times or less the thickness of the paperboard base paper constituting the paper cover 10.

The height H12 of the side wall portion 16 is set to 8.0 mm.

According to the container 1 with a paper lid as described above, the paper lid 10 and the container body 30 are both made of paper, and the materials can be unified. Therefore, both the paper lid 10 and the container body 30 can be disposed of and incinerated as ordinary paper waste. Further, since the paper lid 10 and the container body 30 have the same texture, a sense of design unity is obtained as a whole.

Such a paper lid 10 can be manufactured, for example, by applying the techniques described in Patent Document 1 and Patent Document 2, etc., by press-molding one sheet of paperboard base paper.

Hereinafter, a specific application example thereof will be described.

FIG. 8 is a schematic diagram showing one step of a method for manufacturing a paper lid, and FIG. 9 is a schematic diagram showing a margin winding forming step following the step shown in FIG.

First, with reference to FIG. 8, the paper lid manufacturing apparatus includes a first mold 50 located on the upper side and a second mold 60 located on the lower side.

The first mold 50 includes an upper mold member 51 and an elevating member 52 arranged on the outer peripheral side of the upper mold member 51 and having a curl groove 54.

The second mold 60 is arranged on the outer peripheral side of the lower mold member 61 arranged at a position facing the upper mold member 51 of the first mold 50 and the lower mold member 61, and the first mold 50. It is provided with a curling member 62 facing the elevating member 52 and having a curl groove 64.

In the preparatory step of the edge winding forming step, the central portion of the paperboard base paper 41 is sandwiched between the upper mold member 51 and the lower mold member 61, and the outer peripheral portion is between the lower mold member 61 and the elevating member 52. It is sandwiched between the grooves 55 formed in the above. Further, at this time, the peripheral edge of the central portion is sandwiched between the flange forming portion 53 of the upper mold member 51 and the flange forming portion 63 of the lower mold member 61, and is firmly held.

Next, with reference to FIG. 9, the elevating member 52 of the upper mold member 51 and the curling member 62 of the lower mold member 61 rise from this state, so that the end portion of the paperboard base paper 41 becomes the curling member 62. The curl groove 64 and the curl groove 54 of the elevating member 52 are wound to form the edge winding 14.

FIG. 10 is a schematic diagram showing an example for comparison with the steps shown in FIGS. 8 and 9.

With reference to the figure, a manufacturing apparatus including a first mold 50A in which the flange forming portion 53 is not formed on the upper mold member 51 and a second mold 60A in which the flange forming portion 63 is not formed on the lower mold member 61. A case of manufacturing a paper lid will be described. In other words, it is a case of manufacturing a paper lid having no flange portion.

In this case, in the preparatory step of the edge winding forming step, the portion where the paperboard base paper 41 is sandwiched between the first mold 50A and the second mold 60A is the inclined portion 59 of the upper mold member 51 and the lower mold member 61. Since it is only a portion between the inclined portion 69 and the curling member 62 of the lower die member 61 and the elevating member 52 of the upper die member 51 in the edge winding forming step, the paperboard base paper may be displaced. be. When this deviation occurs, the diameter of the edge winding changes for each press, and a (sweet) edge winding with a poor winding state is formed, so that the quality of the paper lid 10 may vary.

On the other hand, since the first mold 50A and the second mold 60A each include a flange forming portion 53 and a flange forming portion 63 for forming the flange portion 13 of the paper lid 10, the edge winding is provided. In the preparatory step of the forming step, the upper and lower molds can firmly hold the portion corresponding to the flange portion 13. As a result, the displacement of the paperboard base paper in the edge winding forming step can be suppressed, and the formation of a badly wound (sweet) edge winding due to the change in the edge winding diameter for each press can be suppressed. Therefore, the diameter of the rim winding is stable and the quality is improved.

Further, as will be described later, the horizontal width W12 of the flange portion 13 should be small in consideration of the substantial accommodating capacity of the container body 30, but the holding by the flange forming portions 53 and 63 is stabilized. Considering this, it is preferable that the thickness is set to about 5.0 mm as described above.

Subsequently, the effect of setting the dimensional relationship of the paper lid 10 as described above will be described below.

FIG. 11 is an enlarged view of the P1 portion shown in FIG. 2, and FIG. 12 is a diagram showing a dimensional relationship when the horizontal width of the flange portion is set to more than 1 times the edge winding diameter of the edge winding portion. FIG. 13 is a diagram showing a dimensional relationship when the flange portion is formed below the lower end of the edge winding portion.

First, referring to FIG. 11, since the paper lid 10 of the container with a paper lid 1 is configured to include a convex bulging portion 22 that bulges upward, the bottom portion 11 of the paper lid 10 is , A space 25 that is convex upward is provided.

Therefore, when the paper lid 10 and the container body 30 are overlapped with each other, the substantially capacity of the container body 30 can be increased by the amount of the space 25.

Further, since the bulging portion 22 has a shape protruding upward from the flat portion 21, the bulging portion 22 acts like a rib, and as a result, the strength of the paper lid 1 in the horizontal direction is improved. be able to.

Further, the horizontal width W12 of the flange portion 13 is set to be 1/2 times the size of the edge winding diameter W13 of the edge winding portion 14, and the edge formed at the upper end of the side wall portion 32 of the container body 30. The width of the winding 33 is set to be slightly smaller than the edge winding diameter W13 of the edge winding portion 14 and larger than the horizontal width W12 of the flange portion 13. Therefore, the protruding length L11 of the edge winding portion 14 is smaller than the edge winding diameter W13.

On the other hand, with reference to FIG. 12, when the horizontal width N12 of the flange portion 13 is set to be more than 1 times the edge winding diameter N13 of the edge winding portion 14, the protruding length M11 is shown in FIG. It is larger than the protrusion length L11.

Therefore, according to the paper lid 10 and the container main body 30 in which the dimensional relationship as shown in FIG. 11 is set, when the paper lid 10 is placed on the container main body 30, the edge winding portion 14 of the paper lid 10 is used. The outward protrusion length L11 (protrusion degree) of the container body 30 can be suppressed as much as possible, and as a result, the size of the entire container with a paper lid can be made compact.

Therefore, even when the paper container 1 with a lid is displayed in a place where the space of the display shelf such as a convenience store is limited, the display can be efficiently performed.

Further, with such a configuration, there is also an effect of reducing the lateral displacement between the paper lid 10 and the container main body 30.

With reference to FIG. 11 and further with reference to FIG. 7, the side wall portion 12 has a size extending downward from the upper end of the container body 30 when it is put on the container body 30, and is a flange. The angle θ formed by the lower surface of the portion 13 and the outer surface of the side wall portion is set to 95 °.

Since the side wall portion 12 of the paper lid 10 is formed at an angle close to vertical in this way, even when a lateral force is applied to the paper lid 10 when the paper lid 10 is overlapped with the container body 30. The side wall portion 12 of the paper lid 10 is caught in the opening of the container body 30, which can prevent the paper lid 10 from being unintentionally detached from the container body 30.

Furthermore, since the height of the side wall portion is 8 mm, the side wall portion 12 of the paper lid 10 and the side wall 32 of the container body 30 are often caught when the paper lid 10 and the container body 30 are overlapped with each other. Since the decrease in the storage capacity can be suppressed, the paper lid is unintentionally removed even when a lateral force is applied to the side wall portion 12 of the paper lid 10 and the side wall portion 32 of the container body 30. This can be suppressed, and the lateral displacement of the paper lid 10 from the container body 30 can be reduced.

Continuing with reference to FIG. 11, as described above, the flange portion 13 is located above the lower end of the rim winding portion 14, and the distance W14 between the lower end of the flange portion 13 and the lower end of the rim winding portion 14 is the rim winding of the rim winding portion 14. The length is 1/5 times or more and 1/2 times or less the diameter. Therefore, a space 15 defined by the flange portion 13 and the side wall portion 12 is formed on the inner side of the edge winding portion 14.

On the other hand, referring to FIG. 13, the lower surface of the flange portion 13 is located at substantially the same level M12 as the lower end of the edge winding portion 14. Therefore, the space portion 15 as shown in FIG. 11 is not formed. Therefore, the upper end of the side wall portion 32 of the container main body 30 and the lower surface of the flange portion 13 and the lower end of the edge winding portion 14 come into contact with each other at the level M12.

According to the paper lid 10 shown in FIG. 11, since the space 15 defined by the flange portion 13 and the side wall portion 12 is formed on the inner side of the edge winding portion 14, the upper end portion of the opening of the container body 30 is formed. If has a width equal to or less than that of the flange portion 13, the upper end portion of the opening of the container body 30 enters the space 15 of the paper lid 10, so that the paper lid 10 and the container body 30 are overlapped with each other. The height of the paper can be suppressed.

FIG. 14 is a diagram showing a laminated body obtained by stacking containers with paper lids in the vertical direction, and FIG. 15 is an enlarged view of a P3 portion shown in FIG.

With reference to these figures, the laminated body 5 is formed by stacking the containers 1A, 1B, and 1C with paper lids in order on the upper side.

For example, when the paper container 1B is stacked on the paper container 1A, the leg portion 34 of the container body 30B of the paper container 1B is replaced with the paper lid of the paper container 1A. It is installed on the first flat portion 21 of 10A.

Further, as described above, the width W15 of the first flat portion 21 is set to 5.0 mm.

Further, since the legs 34 of the container body 30B are combined and bonded in a folded state, the width W15 of the first flat portion 21 may be at least larger than the thickness of three paperboard base papers. .. On the other hand, since the side wall portion 12 of the paper lid 10A and the side wall portion 32 of the container body 30B are provided with an inclination, it is preferable to set the dimensions in consideration of this inclination to some extent.

Further, considering dimensional error, clearance, resistance to tearing of paper during molding, etc., the width W15 of the first flat portion 21 is 10 times or more and 20 times or less the thickness of the paperboard base paper constituting the paper lid 10. It can be said that it is preferable that it is set to.

Since a paperboard base paper having a thickness of about 0.3 to 0.4 mm is used, the range of 10 times or more and 20 times or less is in the range of 3.0 mm to 8.0 mm, and that of the first flat portion 21. The width W15 is set to fall within this range.

With this configuration, the entire leg portion 34 of the container body 30B of the paper lid container 1B stacked on top is the first flat portion 21 of the paper lid 1A of the paper lid container 1A located below. Can be installed in. Further, since the width W15 of the first flat portion 21 is within a predetermined range according to the paperboard base paper, it is possible to suppress the deviation in the lateral direction.

Further, the bottom portion 11 is configured to include a bulging portion 22 which is convex upward from the first flat portion 21 and is provided with a flat second flat portion 23 in the central portion.

Therefore, for example, the height of the central portion of the bulging portion 22 can be suppressed as compared with the case where the bulging portion 22 is projected upward on the curved surface without providing the second flat portion 23. Therefore, when the paper lid 1A and the container body 30B are overlapped with each other, it is possible to prevent the bulging portion 22 of the paper lid 1A from coming into contact with the bottom surface of the container body 30 as much as possible, and even if they come into contact with each other. Since it is flat, the stacked state is stable.

FIG. 16 is a diagram showing a laminated body obtained by stacking paper lids in the vertical direction.

With reference to the figure, a plurality of paper lids 10A, 10B, and 10C of the same type as the paper lid 10 described above can be stacked to form a laminated body.

Even when the laminate is formed in this way, for example, the paper lid 10B is placed on the paper lid 10A in a state where the side wall portion of the paper lid 10B is in contact with the side wall portion of the paper lid 10A. Will be installed. For this reason, lateral displacement is suppressed and the installation state is stable.

FIG. 17 is an enlarged cross-sectional view showing the configuration of a container with a paper lid according to the second embodiment of the present invention, and corresponds to FIG. 7.

In the description, since it is basically the same as that according to the first embodiment, the differences will be mainly described.

With reference to the figure, in the paper lid 10 of the container with a paper lid according to this embodiment, the height of the rising portion of the bulging portion 22, that is, the first flat portion 21 and the second flat portion 21 The height difference from the unit 23 is set higher than that of the first embodiment. According to such a shape, when the paper lid 10 and the container body 30 are overlapped with each other, the substantial capacity of the container body 30 can be increased.

FIG. 18 is an enlarged cross-sectional view showing the configuration of a container with a paper lid according to a third embodiment of the present invention, and corresponds to FIG. 7.

In the description, since it is basically the same as that according to the first embodiment, the differences will be mainly described.

With reference to the figure, in the paper lid 10 of the container with a paper lid according to this embodiment, the bulging portion 22 is changed to a shape that rises in a stepped manner. Even with such a shape, when the paper lid 10 and the container body 30 are overlapped with each other, the substantial capacity of the container body 30 can be increased.

In each of the above embodiments, the paper container body has been described, but the present invention is not limited to this, and the container body is not particularly limited as long as it has an opening at the top.

Further, in each of the above-described embodiments, it has been described that the container main body is manufactured by combining the base papers of the bottom plate and the side plate and adhering and pressing them, but the present invention is not limited to this. For example, it may be a paper container obtained by press-molding a piece of punched paperboard base paper, and as an example of the manufacturing method thereof, the technique described in JP-A No. 10-43027 can be used. can. Further, in this case, it is preferable that a leg portion or a convex portion is formed on the bottom portion of the paper container from the viewpoint of ensuring stability during stacking.

Further, in each of the above embodiments, the paper lid and the container body having a substantially oval shape in a plan view have been described, but the present invention is not limited to this. The shape of the paper lid and the container body in a plan view may be, for example, a substantially circular shape, a substantially elliptical shape, or the like.

Since a substantially circular shape, a substantially elliptical shape, a substantially oval shape, or the like is often used as the shape of the container body, a substantially circular shape, a substantially elliptical shape, a substantially oval shape, or the like is adopted as the shape of the paper lid in a plan view. Then, it can be preferably adapted to the shape of such a common container body.

Further, in each of the above embodiments, the configuration in which the bulging portion and the first flat portion are provided at the bottom of the paper lid has been described, but the first flat portion may be omitted. Therefore, the bulging portion may be configured to extend from the connecting portion between the bottom portion and the side wall portion. It is also possible to omit both the bulging portion and the first flat portion. Furthermore, a plurality of bulging portions may be provided. Further, in the bulging portion, instead of the second flat portion, a portion protruding upward in a curved surface shape may be provided.

Further, in each of the above embodiments, it has been described that the paper lid, the container body, and the like have specific dimensions, but the present invention is not limited to this.

For example, it has been explained that the horizontal width of the flange portion is ½ of the rim winding diameter of the rim winding portion, but the width is not limited to this. It is advantageous for the horizontal width of the flange to be as small as possible in terms of the actual capacity of the container body, but considering the manufacturing aspect such as mold making, the size is 1/5 times or more and 1 times or less. It is preferable to set it to, and it is more preferable if the size is 1/2 times or more and 1 times or less.

Further, although it has been explained that the height of the side wall portion is 8 mm, the height is not limited to this, and may be 5 mm or more and 12 mm or less. When the paperboard base paper is press-molded, the height of the side wall portion tends to be wrinkled or torn, so that the height is preferably 12 mm or less. Further, the height of the side wall portion is more preferably 8 mm or more from the viewpoint of suppressing lateral displacement.

With this configuration, when the paper lid and the container body are overlapped as described above, the side wall portion of the paper lid and the side wall of the container body are often caught, while the decrease in the storage capacity can be suppressed.

Further, although it has been explained that the edge winding diameter (diameter) of the edge winding portion has a specific dimension, the present invention is not limited to this. The edge winding diameter of the edge winding portion can be set, for example, in the range of 2.0 mm or more and 5.0 mm or less.

Further, it is desirable that the angle θ formed by the lower surface of the flange portion and the outer surface of the side wall portion is set to 95 ° or more and 120 ° or less. From another point of view, the angle θ can be said to be an element that determines the inclination angle of the side wall portion. By setting the angle θ to 120 ° or less, it is possible to prevent the paper lid from not fitting well with the opening of the container body even if the side wall opens slightly outward due to springback. .. From another point of view, in the configuration including the first flat portion, since the flange portion and the flat portion are in a parallel relationship in the side view, the angle θ formed by the lower surface of the flange portion and the outer surface of the side wall portion is , The angle formed by the inner surface of the side wall portion and the upper surface of the first flat portion. That is, in the configuration including the first flat portion, the angle θ can be said to be an element that determines the angle formed by the inner surface of the side wall portion and the upper surface of the first flat portion.

The thickness of the paperboard base paper is not particularly limited, but is preferably about ^{0.2 to 0.5 mm (weight 150 to 500 g / m 2).}

Further, although not described in detail in each of the above embodiments, the type of paperboard base paper is not particularly limited. As the paperboard base paper, pure white roll paper, kraft paper, parchment paper, ivory paper, Manila paper, card paper, cup paper, glassin paper and the like can be used depending on the desired use.

Further, as described in each of the above embodiments, a synthetic resin film or coating may be laminated on the surface of the paperboard base paper. The type of synthetic resin is not particularly limited, and is limited to polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyolefin resins such as polypropylene, polyethylene and polymethylpentene, acrylic (methacryl) resins, diene resins such as polybutadiene, and polycarbonate. Examples thereof include thermoplastic resins such as based resins. The thickness is also not limited, and examples thereof include a thickness range of 10 to 50 μm. By laminating the synthetic resin, it is possible to impart properties such as heat resistance, water resistance, and air permeability to the lid and container after molding.

Further, although not described in each of the above embodiments, the surface of the paperboard base paper may be printed. In this case, the design can be improved.

Further, although not described in each of the above embodiments, an adhesive may be appropriately applied to the end portion of the edge winding portion to fix it to the flange portion or the side wall portion. In this case, since the edge winding portion is fixed by the adhesive, springback can be suppressed.

Further, although not described in each of the above embodiments, the paperboard base paper may be provided with lines (ruled lines) as needed. Wrinkles generated during molding of the lid are absorbed by this ruled line, and a lid having a neat appearance can be formed.

1 ... Container with paper lid 10 ... Paper lid 11 ... Bottom 12 ... Side wall 13 ... Flange 14 ... Edge winding 21 ... First flat part 22 ... Swelling part 23 ... Second flat part 30 ... Container Main body 31 ... Bottom 32 ... Side wall 33 ... Edge winding 35 ... Opening In each figure, the same reference numerals indicate the same or corresponding parts.

This invention relates to a container body and a container with Paper lid composed of a paper cover, in particular, to a container with a paper lid that will be formed by press molding.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a practical container with a paper lid, which can obtain sufficient shape retention and strength.

In order to achieve the above object, the invention according to claim 1 has a paper container body having an opening at the top, and one sheet separately from the container body according to the size of the opening of the container body. It is a container with a paper lid composed of a paper lid formed from paperboard base paper by press molding, and a rim winding is formed on the outer peripheral edge of the opening of the container body, and the paper lid is , a bottom, a side wall portion connected to the bottom, connected to the side wall, e Bei a flange portion extending substantially horizontally outward direction, and a Enmaki portion formed on the outer periphery of the flange portion, the flange portion Is located above the lower end of the edge winding portion, and the horizontal width of the flange portion is set to be 1/5 or more and 1 times or less the edge winding diameter of the edge winding portion. ..

With this configuration, sufficient shape retention and strength can be obtained by the edge winding portion and the flange portion. Further, when the paper lid is placed on the container body, the degree of protrusion of the edge winding portion of the paper lid to the outside of the container body can be suppressed as much as possible. Further, a space defined by the flange portion and the side wall portion is formed on the inner side of the edge winding portion. Furthermore, the materials of the lid and the container can be unified.

According to a second aspect of the invention, in the configuration of the invention of claim 1 Symbol placement, sidewall portions, when put on the container body, the upper end of the container body has a size that extends downwardly, the flange portion The angle θ formed by the lower surface and the outer surface of the side wall portion is 95 ° or more and 120 ° or less.

According to a third aspect of the invention, in the structure of the invention of claim 1 or claim 2 Symbol placement, the distance between the flange portion lower end Enmaki portion lower or higher 1/5 times the edge winding diameter of Enmaki section 1 / It is less than twice as long.

With this configuration, a space defined by the flange portion and the side wall portion is more preferably formed on the inner side of the edge winding portion.

The invention according to claim 4 has a height of a side wall portion of 5 mm or more and 12 mm or less in the configuration of the invention according to any one of claims 1 to 3.

The invention according to claim 5 comprises the configuration of the invention according to any one of claims 1 to 4 , wherein the bottom portion has a convex bulging portion bulging upward.

The invention according to claim 6 is the configuration of the invention according to claim 5, wherein the bottom portion is substantially horizontal from the connection portion with the side wall portion to the peripheral edge of the bulge portion between the connection portion with the side wall portion and the bulge portion. It is provided with a first flat portion extending to.

The invention according to claim 7 is a paper container in which the container body is formed by combining and bonding and pressing the paperboard base paper of the bottom plate and the side plate in the configuration of the invention according to claim 6, and is the first flat portion. The width of is set to be 10 times or more and 20 times or less the thickness of the paperboard base paper constituting the paper container.

The invention according to claim 8 comprises the configuration of the invention according to any one of claims 5 to 7 , wherein the bulging portion includes a second flat portion extending substantially horizontally in the central portion.

The invention according to claim 9 is the invention according to any one of claims 1 to 8 , wherein the shape in a plan view is formed into a substantially circular shape, a substantially elliptical shape, or a substantially oval shape. Is.

With this configuration, the shape of the paper lid in a plan view becomes a substantially circular shape, a substantially elliptical shape, or a substantially oval shape, which is often used as the shape of the container body.
The invention according to claim 10 is the configuration of the invention according to any one of claims 1 to 9, wherein the container body includes a bottom portion and a side wall portion connected to the peripheral edge of the bottom portion and extends upward, and has an edge. The winding is formed at the upper end of the side wall portion.
The invention according to claim 11 has the configuration of the invention according to any one of claims 1 to 10, wherein the width of the edge winding of the container body is smaller than the edge winding diameter of the edge winding portion of the paper lid. Moreover, it is set to be larger than the width of the flange portion in the horizontal direction.

As described above, the invention according to claim 1 is a practical paper lid because sufficient shape retention and strength can be obtained. In addition, when the paper lid is placed on the container body, the degree of protrusion of the edge winding part of the paper lid to the outside of the container body can be suppressed as much as possible, so that the size of the entire container with a paper lid can be reduced. Not only can it be made compact, but the lateral displacement between the paper lid and the container body can also be reduced. Further, since a space defined by the flange portion and the side wall portion is formed on the inner side of the edge winding portion, if the upper end portion of the opening portion of the container body has a width equal to or less than that of the flange portion. Since the upper end of the opening of the container body enters the space on the inner side of the edge winding portion of the paper lid, the height when the paper lid and the container body are overlapped can be suppressed. Furthermore, since the materials of the lid and the container can be unified, both the paper lid and the container body can be disposed of and incinerated as ordinary paper waste. Moreover, since the lid and the container have the same texture, a sense of design unity is obtained as a whole.

According to a second aspect of the invention, in addition to the effect of the invention of claim 1 Symbol placement, since the side wall portion of the paper cover is formed at an angle close to perpendicular, the paper when the superimposed paper lid and container body Even when a lateral force is applied to the lid, the side wall of the paper lid is caught in the opening of the container body, which can prevent the paper lid from being unintentionally removed from the container body.

According to a third aspect of the invention, in addition to claim 1 or claim 2 Symbol mounting the effect of the invention, the space defined by the flange portion and the side wall portion on the inner side of the Enmaki portion is more preferably formed Therefore, if the upper end of the opening of the container body has a width equal to or less than that of the flange, the upper end of the opening of the container body is the space on the inner side of the edge winding part of the paper lid. Since it penetrates, the height when the paper lid and the container body are overlapped can be more preferably suppressed.

The invention according to claim 4 has the effect of the invention according to any one of claims 1 to 3 , and when the paper lid and the container body are overlapped with each other, the side wall portion of the paper lid and the container body Since the side wall is often caught and the reduction in storage capacity can be suppressed, it is made of paper unintentionally even when lateral force is applied to the side wall of the paper lid and the side wall of the container body. It is possible to prevent the lid from coming off, and it is also possible to reduce the lateral displacement of the paper lid from the container body.

The invention according to claim 5 has, in addition to the effect of the invention according to any one of claims 1 to 4 , a space in which the bottom of the paper lid is convex upward, so that the paper lid and the container body are provided. When and are overlapped, the substantial capacity of the container body can be increased. Also, when used as a lid for a container with a paper lid that stores food such as for lunch, the paper lid can be turned over and the food can be stored in the bulge so that it can also be used as a dish for eating and drinking. Become.

In the invention according to claim 6 , in addition to the effect of the invention according to claim 5 , since the bulging portion acts like a rib, the horizontal strength of the paper lid can be improved.

The invention according to claim 7 has, in addition to the effect of the invention according to claim 6 , when a plurality of containers with paper lids in which a paper lid and a container body are stacked are stacked, the paper lids stacked on top of each other are stacked. The entire leg of the container body of the attached container can be installed on the first flat portion of the lid of the container with a paper lid located below, and the width of the first flat portion is predetermined according to the base paper. Since it fits within the range, it is possible to suppress lateral displacement, and the stability during stacking is further improved.

The invention according to claim 8 has the effect of the invention according to any one of claims 5 to 7 , as compared with the case where the bulging portion is projected upward without providing the second flat portion. Since the height of the central part of the bulging part can be suppressed, the bulging part of the paper lid becomes the container body when a plurality of containers with a paper lid on which the paper lid and the container body are stacked are stacked. It is possible to avoid contact with the bottom surface of the paper as much as possible, and even if it touches, it is flat, so the stacked state is stable.

In the invention according to claim 9 , in addition to the effect of the invention according to any one of claims 1 to 8 , the shape of the paper lid in a plan view is a substantially circular shape often used as the shape of the container body. Since it can be adapted to a substantially elliptical shape or a substantially oval shape, the shape of the paper lid can be preferably adapted to the shape of a common container body.

Claims (11)

A paper lid formed by press molding from a single paperboard base paper according to the size of the opening of the container body having an opening at the top.
At the bottom,
A side wall connected to the bottom and
A flange portion connected to the side wall portion and extending substantially horizontally in the outward direction, and a flange portion.
A paper lid comprising a marginal winding portion formed on the outer peripheral edge of the flange portion. The paper lid according to claim 1, wherein the horizontal width of the flange portion is set to a size of 1/5 times or more and 1 times or less the diameter of the edge winding portion. The side wall portion has a size extending downward from the upper end of the container body when it is put on the container body.
The paper lid according to claim 1 or 2, wherein the angle θ between the lower surface of the flange portion and the outer surface of the side wall portion is 95 ° or more and 120 ° or less. The flange portion is located above the lower end of the edge winding portion and is located above the lower end.
The method according to any one of claims 1 to 3, wherein the distance between the lower end of the flange portion and the lower end of the edge winding portion is 1/5 times or more and 1/2 times or less the diameter of the edge winding portion. The paper lid described. The paper lid according to any one of claims 1 to 4, wherein the height of the side wall portion is 5 mm or more and 12 mm or less. The paper lid according to any one of claims 1 to 5, wherein the bottom portion has a convex bulging portion that bulges upward. 6. The bottom portion comprises a first flat portion extending substantially horizontally between the connection portion with the side wall portion and the bulging portion from the connection portion with the side wall portion to the peripheral edge of the bulging portion. The described paper lid. The container body is a paper container made by combining and adhering and pressing the base paper of the bottom plate and the side plate.
The paper lid according to claim 7, wherein the width of the first flat portion is set to be 10 times or more and 20 times or less the thickness of the paperboard base paper constituting the paper container. The paper lid according to any one of claims 6 to 8, wherein the bulging portion includes a second flat portion extending substantially horizontally in the central portion. The paper lid according to any one of claims 1 to 9, wherein the shape in a plan view is formed into a substantially circular shape, a substantially elliptical shape, or a substantially oval shape. A container with a paper lid, comprising the paper lid according to any one of claims 1 to 10 and a corresponding paper container body.

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