JP2023183690A - resin lid - Google Patents

Abstract

To provide a container lid which improves sealability with a simple constitution and can suppress liquid leakage.SOLUTION: A resin lid 1 is provided in a container 100. The container 1 has a container fitting part 103 provided in a container opening 104. The resin lid 1 has a lid top surface 10, and a lid fitting part 30 which is provided in the periphery of the lid top surface 10 and is fit into the paper container fitting part 103. The lid fitting part 30 has a lid fitting part outer wall 31, a lid fitting part top part 32, and a lid fitting part inner wall 33. The lid fitting part inner wall 33 faces a body part 102 of the paper container. An under projection 36 projecting in a circumferential outer direction is provided below the lid fitting part inner wall 33. A step rib part 12 is provided on the lid top surface 10 so as to be adjacent to the lid fitting part inner wall 33. The step rib part 12 is composed of a width part 13 extending in a horizontal direction, and a height part 14 extending in an upper direction from the end of the width part. The height part 14 of the step rib part corresponds to the position of the under projection 36.SELECTED DRAWING: Figure 1

Description

The present invention relates to a resin lid provided on a container.

Containers for beverages and juicy foods preferably have lids. By devising the fitting structure between the lid and container, it is possible to prevent liquid leakage during transportation, for example.

Common containers include paper containers, resin containers, aluminum containers, etc., and shapes include circular containers (including inverted truncated cones) and rectangular containers (including inverted trapezoids). , a bottom portion, a body portion erected from the bottom portion, and a flange portion formed at the upper end of the body portion. An opening is formed at the upper end of the body.

The lid is fitted into the flange. A fitting space surrounding the container flange is formed at the peripheral edge of the lid. At this time, when the upper part of the inner wall of the container body and the lid fitting part make surface contact, the sealing performance is improved. In particular, the longer the contact length (contact area) in the vertical direction, the better the sealing performance (for example, Patent Document 1 or Patent Document 2).

Patent No. 2004-001892 JP2021-075287A

As described above, the lid and lid fitting structure described in Patent Document 1 or Patent Document 2 have sufficient sealing performance. However, in recent years, as the demand for delivery of beverages and food by motorbike and bicycle has increased, the number of liquid leakage problems due to containers falling over has also increased. Therefore, it is necessary to further improve the sealing performance.

Although the manufacturing accuracy of the container and the manufacturing accuracy of the lid described in Patent Document 1 or Patent Document 2 are sufficient, even if there is a slight dimensional error, the airtightness deteriorates.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a container lid that can improve sealing performance and suppress liquid leakage with a simple configuration.

To achieve the above object, the resin lid of the present invention includes a lid top surface and a lid fitting portion provided around the lid top surface that fits into a container fitting portion provided at the container opening. Be prepared. The lid fitting part has a lid fitting part outer wall, a lid fitting part top part, and a lid fitting part inner wall. The inner wall of the lid fitting portion faces the body of the container. The inner wall of the lid fitting part is provided with an under protrusion that protrudes in a circumferential direction. A stepped rib portion is provided on the lid top surface so as to be adjacent to the inner wall of the lid fitting portion, and the stepped rib portion includes a width portion extending in the horizontal direction and a portion extending upward from the end of the width portion. The height of the stepped rib portion corresponds to the position of the under protrusion.

The under projection is brought into close contact with the container body while being deformed. At this time, the stepped rib portion functions as a rib and resists the elastic deformation of the under protrusion. This ensures that the under protrusion functions reliably.

In the above invention, preferably, the width of the step rib is 1 to 3 times the height of the step rib. About twice as much is preferable.

Thereby, the step rib functions as a rib.

In the above invention, preferably, the thickness of the under protrusion is thinner than the thickness of the stepped rib.

The under protrusion has low rigidity and is easily deformed. The stepped ribs have high rigidity and are difficult to deform.

To achieve the above object, the resin lid of the present invention includes a lid top surface and a lid fitting portion provided around the lid top surface that fits into a container fitting portion provided at the container opening. Be prepared. The lid fitting part has a lid fitting part outer wall, a lid fitting part top part, and a lid fitting part inner wall. The inner wall of the lid fitting portion faces the body of the container. The inner wall of the lid fitting part is provided with an under protrusion that protrudes in a circumferential direction. A first stepped rib portion is provided on the top surface of the lid so as to be adjacent to the inner wall of the lid fitting portion, and a second stepped rib portion is provided adjacent to the first stepped rib portion.

The first stepped rib portion functions as a rib and resists elastic deformation of the under protrusion. The second stepped rib portion assists the rib function of the first stepped rib portion.

In the above invention, preferably, the taper angle of the inner wall of the lid fitting portion is equal to the taper angle of the paper container, and the inner wall of the lid fitting portion is provided with a step protrusion that protrudes in a circumferential direction above the under protrusion. , the height of the second stepped rib portion corresponds to the position of the stepped protrusion.

The stepped protrusion presses against the container body, improving sealing performance. At this time, the second step rib portion functions as a rib and opposes the pressing force of the step protrusion.

The lid of the present invention can improve sealing performance and suppress liquid leakage.

Schematic diagram of a container with a lid Schematic diagram of the lid body Detailed configuration diagram of the lid body Schematic diagram of the fitting operation of the lid and container Detailed explanatory diagram of the contact state between the inner wall of the lid fitting part and the container body Explanation diagram of second step rib operation Variant Application examples other than circular paper containers

～Basic configuration～
FIG. 1 is a schematic diagram of a container with a lid. First, the basic configuration will be explained. The lidded container consists of a lid 1 and a container 100.

The container 100 is made of paper, for example. Generally laminated. It includes a bottom portion 101, a body portion 102, and a flange portion 103. The bottom portion 101 is circular in plan view. The body portion 102 has a substantially inverted truncated cone shape when viewed from the side, and stands upright from the bottom portion 101 . A flange portion 103 formed at the upper end of the body portion 102 is formed at the upper end of the body portion 102 . It is formed in a curl shape on the outside of the circumference.

An opening 104 is formed at the upper end of the body 102 . The lid 1 is fitted onto the flange portion 103 and closes the opening 104.

The lid 1 is made of resin. For example, it is made of polypropylene. Polyethylene, polyethylene terephthalate, polystyrene, etc. may also be used.

～Lid composition～
FIG. 2 is a schematic diagram of the lid. FIG. 3 is a detailed configuration diagram of the lid.

The lid 1 consists of a lid top surface 10 and a lid fitting part 30. The lid fitting part 30 is provided on the periphery of the lid top surface 10 and fits into a container fitting part (flange part 103 ) provided in the container opening 104 .

The lid fitting part 30 has a lid fitting part outer wall 31, a lid fitting part top part 32, and a lid fitting part inner wall 33. That is, the lid fitting part outer wall 31 and the lid fitting part inner wall 33 face each other, and the lid fitting part outer wall 31 and the lid fitting part inner wall 33 are continuous with the lid fitting part top part 32 at the upper end, and are approximately gate-shaped. A fitting space 34 surrounded by a portal shape is formed.

An under protrusion 36 is provided at the lower part of the inner wall 33 of the lid fitting part, and a step protrusion 37 is provided at the middle of the inner wall 33 of the lid fitting part and above the under protrusion 36 (details will be described later).

The configuration of the lid top surface 10 will be explained. The lid top surface central portion 11 is located at the center of the lid top surface 10.

The step rib portion 12 is provided on the top surface 10 of the lid so as to be adjacent to the inner wall 33 of the lid fitting portion. The stepped rib portion 12 consists of a width portion 13 and a height portion 14. The width portion 13 extends horizontally from the lower end of the inner wall 33 of the lid fitting portion. The height portion 14 extends diagonally upward from the end of the width portion 13. The taper is preferably about 0 to 45 degrees.

The stepped rib portion 15 is provided on the lid top surface 10 so as to be adjacent to the stepped rib portion 12. The stepped rib portion 15 consists of a width portion 16 and a height portion 17. The width portion 16 extends horizontally from the upper end of the height portion 14 of the stepped rib portion 12. The height portion 17 extends diagonally upward from the end of the width portion 16. The taper is preferably about 0 to 45 degrees.

The stepped rib portion 18 is provided on the lid top surface 10 so as to be adjacent to the stepped rib portion 15. The stepped rib portion 18 consists of a width portion (numbering omitted) and a height portion (numbering omitted). The width portion of the step rib portion 18 extends horizontally from the upper end of the height portion 17 of the step rib portion 15. The height portion of the stepped rib portion 18 extends downward from the end portion of the width portion of the stepped rib portion 18, and is continuous with the periphery of the lid top surface center portion 11.

Furthermore, a plurality of (five shown in the drawings) stepped rib portions 19 that cut into the radial direction are provided on the center portion 11 of the lid top surface substantially equally in the circumferential direction.

～Protrusion～
An under protrusion 36 is provided at the lower part of the inner wall 33 of the lid fitting part, and a stepped protrusion 37 is provided at the middle part of the inner wall 33 of the lid fitting part and above the under protrusion 36. In the illustrated preferred example, one under protrusion 36 and three step protrusions 37 are provided, but the number is not limited.

The under protrusion 36 is provided so as to protrude outward along the circumference. The illustrated preferred embodiment has a semi-elliptical shape in vertical section. For example, when the height of the inner wall 33 of the lid fitting part is about 10 mm, the long axis diameter of the under protrusion 36 is preferably about 1 to 3 mm, and the short axis diameter is preferably about 0.5 to 1.2 mm. . In addition to the semi-elliptical shape, it is preferable to have a curved shape in the vertical cross section, such as a semicircle or a semi-ellipse, since this will not inhibit the deformation of the under protrusion when fitting the lid.

The step protrusion 37 is provided so as to protrude outward along the circumference. In the preferred embodiment shown, it is a right triangle in vertical section. The stepped protrusion 37 is formed to extend vertically downward from the upper end and horizontally from the lower end. For example, when the height of the inner wall 33 of the lid fitting part is about 10 mm, it is preferable that the height of the step protrusion 37 is about 1 to 2 mm, and the width is about 0.1 to 0.3 mm.

The stepped protrusion 37 may have any triangular shape as long as the stepped shape can ensure appropriate rigidity when fitting the lid. It may have a rectangular shape or the like.

In addition, the above-mentioned dimensions are illustrations for easy understanding of the invention, and are not limited to each dimension.

～Thick～
The thickness of the resin lid of the present application will be considered. The following dimensions are illustrative to facilitate understanding of the invention, and are not limited to each dimension. For example, a film with a thickness of 0.3 mm is formed.

The thickness of the outer wall 31 of the lid fitting part is 0.17 to 0.21 mm, the thickness of the top part 32 of the lid fitting part is 0.25 to 0.27 mm, and the thickness of the upper part of the inner wall 33 of the lid fitting part is 0.17 to 0.21 mm. The wall thickness in the range where is not formed is 0.21 to 0.24 mm, the wall thickness of the step protrusion 37 is 0.15 to 0.20 mm, and the wall thickness of the under protrusion 36 is 0.12 to 0.14 mm. be.

The thickness of the height portion 14 of the step rib portion 12 is 0.12 to 0.16 mm, and the thickness of the height portion 17 of the step rib portion 15 is 0.18 to 0.21 mm.

That is, the under protrusion 36 has the thinnest wall and is easily deformed due to its low rigidity.

Further, by forming the stepped projection 37 in the middle of the inner wall 33 of the lid fitting portion, the sheet is stretched to the stepped portion and the distance in the vertical direction is further increased, so that the under projection 36 can be reliably made thinner.

～Mating～
FIG. 4 is a schematic diagram showing the fitting operation of the lid 1 and the container 100. The container flange portion 103 is fitted into the fitting space 34 of the lid fitting portion 30. The outer wall 31 of the lid fitting part is recessed inward to correspond to the shape of the container flange part 103.

When fitted, the lid fitting part inner wall 33 and the container body 102 face each other. In particular, it is preferable that the taper angle of the inner wall 33 of the lid fitting part be equal to the taper angle of the paper container 102, and that the inner wall 33 of the lid fitting part and the container body 102 be in contact with each other as much as possible. This improves sealing performance.

FIG. 5 is a detailed view of the contact state between the lid fitting part inner wall 33 and the container body 102 when they are fitted. The under protrusion 36 is provided so as to protrude outward along the circumference.

A reaction force acts on the container body 102. The under protrusion 36 is easily displaced due to the synergistic effect of its curved shape and thin wall. The elastic force of the under protrusion 36 further improves the sealing performance with the inner wall of the container body 102. Thereby, liquid leakage can be suppressed with a simple configuration.

While the under protrusion 36 is easily deformed, the step protrusion 37 has a high rigidity (is difficult to displace) due to the synergistic effect of its right triangular shape and relatively thick wall. The step protrusion 37 is provided so as to protrude outward along the circumference. The convex portion of the step projection 37 presses the container body 102. The pressing force of the step protrusion 37 improves sealing performance.

On the other hand, the stepped rib portion 12 functions as a rib (details will be described later). Further, the thickness of the stepped rib portion 12 is approximately the same as or slightly thicker than the thickness of the under projection 36. The stepped rib portion 12 has high rigidity (is not easily displaced) due to the synergistic effect of the rib function and the thick wall.

When the under protrusion 36 attempts to return to its original shape after deformation, the under protrusion 36 is held between the container body 102 and the stepped rib portion 12, and the elastic force of the under protrusion 36 is maintained.

As a result, a rigid 12-soft 36-rigid 37 structure is formed. Since the flexible structure is sandwiched between the rigid structures, the under protrusion 36 cannot escape upward or in the radial center direction, and the under protrusion 36 can reliably move along the inner wall of the container body 102 in the circumferential direction. deforms and prevents liquid leakage.

Note that the stepped rib portion 15 functions as a rib (details will be described later). The step rib portion 15 counters the pressing force of the step protrusion 37 and assists the rib function of the step rib portion 12.

～Step rib～
The step rib portion 12 is provided on the top surface 10 of the lid so as to be adjacent to the inner wall 33 of the lid fitting portion. The stepped rib portion 12 consists of a width portion 13 and a height portion 14.

The height portion 14 of the stepped rib portion 12 corresponds to the position of the under projection 36. In the illustrated example, the upper and lower ends of the under protrusion 36 are included between the upper and lower ends of the height portion 14 . For example, when the height of the inner wall 33 of the lid fitting part is about 10 mm and the long axis diameter of the under protrusion 36 is about 1 to 3 mm, the height of the height part 14 is preferably about 1 to 4 mm. Alternatively, the height of the height portion 14 is preferably about 1.0 to 1.5 times the major axis diameter of the under protrusion 36. More specifically, in the stepped rib portion 12, the outer end of the width portion 13 and the lower end of the under projection 36 are continuous via another minute arc. Note that the under protrusion 36 is more easily deformed due to the small circular arc.

It is preferable that the width portion 13 is within a predetermined width so that the stepped rib 12 functions as a rib. If the width portion 13 is too long, it will bend and sufficient rib rigidity will not be obtained. When the height of the height portion 14 is approximately 1 to 4 mm, the width of the width portion 13 is preferably 2 to 6 mm. Alternatively, the width of the width portion 13 is preferably about twice the height of the height portion 14. The above-mentioned dimensions are illustrative to facilitate understanding of the invention, and are not limited to each dimension.

Thereby, the step rib portion 12 functions as a rib and counteracts the elastic force of the under protrusion 36.

FIG. 6 is an explanatory diagram of the operation of the stepped rib portion 15.

The stepped rib portion 15 is provided on the lid top surface 10 so as to be adjacent to the stepped rib portion 12. The stepped rib portion 15 consists of a width portion 16 and a height portion 17.

The height portion 17 of the step rib portion 15 corresponds to the position of the step protrusion 37. In the illustrated example, the lower end position of the height portion 17 of the stepped rib portion 15 approximately corresponds to the lower end position of the three stepped protrusions 37 . The upper end position of the height portion 17 of the step rib portion 15 is located at a position approximately 1.5 times the total length of the three step protrusions 37 in the height direction. For example, if the height of the inner wall 33 of the lid fitting part is about 10 mm and the total height of the three step protrusions 37 is about 3 to 6 mm, the height of the height part 17 is about 2 to 8 mm. preferable. Alternatively, the height of the height portion 17 is preferably about 0.5 to 1.5 times the total height of the three stepped protrusions 37.

It is preferable that the width portion 16 is within a predetermined width so that the stepped rib 15 functions as a rib. If the width portion 16 is too long, it will bend and sufficient rib rigidity will not be obtained. When the height of the height portion 17 is approximately the same as the height of the three stepped protrusions 37, the width of the width portion 16 is preferably approximately the same as the height portion 17. For example, the width of the width portion 16 is preferably about 0.5 to 1.5 times the height of the height portion 17. The above-mentioned dimensions are illustrative to facilitate understanding of the invention, and are not limited to each dimension.

As a result, the stepped rib portion 15 resists the pressing force of the stepped protrusion 37 and assists the rib function of the stepped rib portion 12.

~ Verification when falling ~
The sealing performance of the lid of the present invention was verified as follows. By the way, since the body of a paper container is formed by overlapping the end portions of substantially fan-shaped blanks, a step is created at the overlapped portion. When the container falls over, there is a risk of liquid leakage due to the difference in level or slight dimensional error.

(Verification Example 1) Coffee at room temperature was added as the content, and the time at which liquid dripping started after falling was measured. When comparing five conventional examples without the under protrusion 36-step rib part 12 structure and five examples with the under protrusion 36-step rib part 12 structure, it was found that the conventional example started dripping in an average of 4 seconds. In the example, dropping started in an average of 13 seconds. Although liquid leakage cannot be completely prevented, the drip start time is extended nearly three times, and liquid leakage is suppressed.

According to the above verification, liquid leakage can be prevented if the container is returned within a few seconds after being overturned.

(Verification Example 2) Pork soup was added as the contents and heated in a microwave, and the time when the liquid started dripping after falling over was measured. When comparing three conventional examples without the under protrusion 36-step rib part 12 structure and three examples with the under protrusion 36-step rib part 12 structure, it was found that the conventional example started dripping in an average of 2 seconds. In the example, no dripping occurred even after 3 minutes had passed. Liquid leakage was completely prevented.

Similar tests were conducted with yukkejang and ginger soup. As with the pork soup, in the Example, the Yukgaejang did not drip even after 3 minutes. In the case of ginger soup, there were cases in which dripping did not occur even after 3 minutes, cases in which dripping started in 42 seconds, and cases in which dripping started in 14 seconds.

(Discussion) The liquid leakage suppressing effect was confirmed even at room temperature without heating. The effect becomes more noticeable when heated in a microwave. It can be inferred that the resin is softened by the heating of the contents, and the under protrusion 36 is flexibly deformed in accordance with the inner wall of the container, and the stepped rib portion 12 acts to prevent the elastic deformation from escaping.

Not only for microwave heating, but also for hot beverages such as hot coffee, hot pork soup, and hot soup, the steam heat causes the under protrusion 36 to flexibly deform in accordance with the inner wall of the container, and the stepped rib portion 12 to It can be inferred that this acts to prevent the elastic deformation from escaping.

～Variation example～
The present invention is not limited to the above-mentioned embodiments, and various changes can be made within the scope of the above-mentioned technical idea.

FIG. 7 shows one of the modified examples. In the embodiment described above, the combinations of the under protrusion 36-step rib portion 12 structure and the stepped protrusion 37-step rib portion 15 structure have been described, but the effects of the present invention can be obtained with the under protrusion 36-step rib portion 12 structure alone. In the illustrated modification, the step protrusion 37-step rib portion 15 structure is omitted.

FIG. 8 shows another application example. In the above embodiment, the application to a lid for a circular paper container has been described, but the illustrated modification is an example of application to a lid for a rectangular resin container. That is, it is applicable without being limited by the container shape or container material. Even in the modified example, sealing performance can be improved and liquid leakage can be suppressed.

1 Lid 10 Lid top surface 11 Lid top center portion 12 Step rib portion 13 Width portion 14 Height portion 15 Step rib portion 16 Width portion 17 Height portion 18 Step rib portion 19 Step rib portion 30 Lid fitting portion 31 Lid fitting Joining part outer wall 32 Lid fitting part top part 33 Lid fitting part inner wall 34 Lid fitting space 36 Under projection 37 Step projection

Claims (5)

The lid top and
comprising a lid fitting part provided around the lid top surface and fitting with a container fitting part provided at the container opening;
The lid fitting part has a lid fitting part outer wall, a lid fitting part top part, and a lid fitting part inner wall,
An under protrusion is provided at the lower part of the inner wall of the lid fitting part, and the under protrusion projects in the circumferential direction,
A stepped rib portion is provided on the lid top surface so as to be adjacent to the inner wall of the lid fitting portion,
The stepped rib portion includes a width portion extending in the horizontal direction and a height portion extending upward from an end of the width portion,
A resin lid characterized in that the height of the stepped rib portion corresponds to the position of the under protrusion. 2. The resin lid according to claim 1, wherein the width of the stepped rib is 1 to 3 times the height of the stepped rib. 2. The resin lid according to claim 1, wherein the thickness of the under projection is thinner than the thickness of the step rib. The lid top and
comprising a lid fitting part provided around the lid top surface and fitting with a container fitting part provided at the container opening;
The lid fitting part has a lid fitting part outer wall, a lid fitting part top part, and a lid fitting part inner wall,
An under protrusion is provided at the lower part of the inner wall of the lid fitting part, and the under protrusion projects in the circumferential direction,
The lid top surface is provided with a first step rib portion adjacent to the inner wall of the lid fitting portion, and a second step rib portion is provided adjacent to the first step rib portion,
A resin lid characterized in that the height of the first stepped rib portion corresponds to the position of the under protrusion. The taper angle of the inner wall of the lid fitting part is equal to the taper angle of the paper container,
The inner wall of the lid fitting part is provided with a step protrusion that protrudes in a circumferential direction above the under protrusion,
5. The resin lid according to claim 4, wherein the height of the second stepped rib portion corresponds to the position of the stepped projection.