Easy-open container lid

Abstract

An easy-open container lid includes: a circular top wall; a skirt having an arcuate portion extending radially outward and downward from the periphery of the top wall in a longitudinal sectional view, and a linear portion extending vertically downward immediately following the arcuate portion; and a flap extending from the lower end of the skirt. At least the base of the flap is integrally formed with the top wall and the skirt by a metal sheet. The container lid consists of a lid body and a disc-shaped synthetic resin liner. The lid body has grooves, each groove having a first portion extending upward along the skirt from both sides of the flap and a second portion extending arcuately from the upper end of the skirt to the periphery of the top wall. The synthetic resin liner is placed on the inner surface of the top wall of the lid body. The lower portion of the linear portion of the skirt is radially forged below a locking ridge of the neck opening to attach to the neck opening. The first portion of each of these grooves extends straight from the lower end of the skirt to an area above the lower end of the linear portion.

Description

Technical Field

[0001] The present invention relates to an easy-open container lid for a container having a cylindrical neck with an annular locking ridge formed at the upper end of its outer circumferential surface, and the neck being sealed after the container is filled with a gaseous liquid to give the interior of the container a positive internal pressure. Background Technology

[0002] Patent documents 1 to 3 disclose an easy-open container lid for a container having a cylindrical neck with an annular locking ridge formed at the upper end of its outer circumferential surface. The neck is sealed to provide positive internal pressure to the container after it is filled with a gaseous liquid. The lid includes a lid body and a liner. The lid body includes a flat, circular top wall, an arcuate portion extending radially outward and downward from the periphery of the top wall in a longitudinal sectional view, a skirt wall extending vertically downward to meet the arcuate portion, and a flap extending from the lower end of the skirt wall. The top wall, skirt wall, and at least the base of the flap are integrally formed from a sheet of metal. A disc-shaped liner made of synthetic resin is provided on the inner surface of the top wall of the lid body. A pair of notches, each consisting of a first part and a second part, are formed on the lid body. The first part extends upward from both sides of the flap on the skirt wall in an arc shape in the circumferential direction, and the second part extends in an arc shape between the upper end of the skirt wall and the periphery of the top wall.

[0003] The container lid is attached to the neck of the container by mounting it onto the neck and pressing the liner against the neck, such that the lower part of the linear portion of the skirt is radially forged inward to below the locking ridge of the neck. To release the neck, the lid detaches from the neck by grasping the flip tab and pulling it radially outward and then upward, causing a pair of grooves to gradually break.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: JP 2008-174266 A

[0007] Patent Document 2: JP 2011-173594 A

[0008] Patent Document 3: JP 2015-40060 A Summary of the Invention

[0009] The problem the invention aims to solve

[0010] However, the inventors have discovered the following problems with the conventional container caps described above based on experience. Specifically, especially when a container equipped with a cap and sealed at the neck is exposed to high temperatures, such as under direct sunlight, the pressure inside the container can increase significantly. When the cap is detached from the neck to release the seal, there is a risk that the cap may suddenly fly off / fall off the neck as the high pressure inside the container is released.

[0011] To address this problem, the present invention aims to provide a novel and improved container lid. According to the invention, the primary technical objective is to provide a container lid that, even with a significant increase in pressure within the container, will not suddenly fly off / fall off the neck when detached from the neck, and that will not substantially cause any other problems or require any excessive force when detached from the neck.

[0012] Problem-solving methods

[0013] As a result of in-depth research, the inventors have discovered that the main objective in this technical field can be achieved by modifying the extension of the first portion of a pair of notches so that the first portion extends straight from the lower end of the skirt wall to a position above the upper end of the lower part of the linear portion to be forged here.

[0014] In other words, the present invention provides an easy-open container lid to achieve the above-mentioned main technical objectives. This container lid is an easy-open container lid for containers having a cylindrical neck portion, wherein the neck portion has an annular locking ridge formed at the upper end of its outer circumferential surface. After the container is filled with gaseous liquid, the neck portion will be sealed to have positive internal pressure.

[0015] The container lid includes a lid body and an inner liner.

[0016] The cover includes a flat, circular top wall, an arcuate portion extending radially outward and downward from the periphery of the top wall in a longitudinal sectional view, a linear portion extending vertically downward immediately following the arcuate portion, and a lifting tab extending from the lower end of the skirt.

[0017] The top wall, the skirt wall, and at least the base of the lifting tab are integrally formed from a metal sheet and have a pair of grooves each consisting of a first part and a second part, wherein the first part extends upward from both sides of the lifting tab on the skirt wall, and the second part extends in an arc shape between the upper end of the skirt wall and the peripheral portion of the top wall.

[0018] The disc-shaped liner, made of synthetic resin, is disposed on the inner surface of the cover.

[0019] The container lid is attached to the neck by forging the lower portion of the linear section of the skirt wall radially inward to below the locking ridge of the neck, wherein...

[0020] The first portion of each of the pair of grooves extends straight from the lower end of the skirt wall to the upper end of the lower portion above the linear portion.

[0021] Preferably, the first portion of each of the pair of notches extends vertically from the lower end of the skirt wall to the upper end above the lower portion of the linear portion. Applicably, the first portion of the pair of notches extends straight to the upper end of the linear portion of the skirt wall and extends upward and arcuately in a direction circumferentially spaced apart from each other at the arcuate portion of the skirt wall. Preferably, the liner is non-adhesive or weakly adhesive to the cover body extending along the pair of notches and covering the pair of arcuate areas of the pair of notches, while the liner is adhesive to the cover body in areas other than the pair of arcuate areas. Applicably, the liner has a thin-walled central portion and a thick-walled peripheral portion, the thick-walled peripheral portion having a lower surface on which an inner annular seal and an outer annular seal are formed concentrically downwards, and the lower end of the outer annular seal is positioned above the upper end of the linear portion of the skirt wall. Preferably, the lower end of the outer annular seal is positioned at the same height as the vertical middle portion of the arcuate portion of the skirt. Preferably, the lower end of the inner annular seal is positioned below the lower end of the outer annular seal but above the upper end of the linear portion of the skirt.

[0022] Invention Effects

[0023] When the container cap detaches from the neck of the container, the internal pressure is typically released approximately at the moment when the first portion of each of the pair of notches breaks from the lower end of the skirt wall to the upper end of the lower part of the forged linear portion of the skirt wall. For the container cap of this invention, the first portion of each of the pair of notches extends vertically from the lower end of the skirt wall to the upper end of the lower part of the forged linear portion. Therefore, when releasing the internal pressure of the container, compared to conventional container caps, the circumferential length of the area where the forged state at the linear portion of the skirt wall is not released but is maintained can be increased. This will prevent the container cap from suddenly flying off / falling when detached from the neck. Simultaneously, the portion of each first portion of the pair of notches extending from the lower end of the skirt wall in the first portion to the upper end of the lower forged linear portion of the skirt wall is the portion that will break during the initial breaking stage of the pair of notches. Because this section extends in a straight line, it requires less force in the initial stage of breaking a pair of notches compared to a section that extends upwards in an arc to both sides circumferentially (i.e., to the direction that separates them circumferentially). Therefore, not much force is needed to detach the lid from the neck. The required force will be much less than that for a conventional lid. Attached Figure Description

[0024] Figure 1 This is a perspective view showing a suitable embodiment of a container lid constructed according to the present invention.

[0025] Figure 2 It is shown in part Figure 1 A cross-sectional view of the container lid.

[0026] Figure 3 It is shown Figure 1 An unfolded diagram of an example of a pair of notches on the lid of a medium-sized container.

[0027] Figure 4 It is shown Figure 1 A diagram showing the relationship between the inner lining and the top wall of the container lid.

[0028] Figure 5 It is shown Figure 1 A partial sectional side view of the container lid attached to the neck of the container. Detailed Implementation

[0029] The preferred embodiments of the container lid constructed according to the present invention will now be described in more detail with reference to the accompanying drawings.

[0030] Reference Figure 1 and Figure 2 The following description is provided. The container lid, marked with 2, consists of a lid body 4 and an inner liner 6 (see...). Figure 2 )composition.

[0031] The cover 4 has a circular top wall 8, a cylindrical skirt 10 hanging down from the periphery of the top wall 8, and a lifting tab 12 extending from the lower end of the skirt 10. (See reference...) Figure 2 Clearly understood, the skirt 10 has the function of... Figure 2 In the longitudinal sectional view, there is an arc-shaped portion 10a extending radially outward and downward from the periphery of the top wall 8, and a linear portion 10b extending vertically downward immediately following the arc-shaped portion 10a. As will be described in more detail later, the container lid 2 is attached to the neck portion 32 of the container (see... Figure 5 When the skirt wall 10 is formed, the lower part 10b-1 of the linear portion 10b is radially deformed inward to form a locking ridge 34 at the neck portion 32 (see Figure 5 The base 14 of the hinged tab 12 (see also...) Figure 3The top wall 8 and skirt wall 10 are integrally formed by applicable machining processes such as stamping and stretching of suitable metal sheets, such as aluminum-based alloy sheets, chromate-treated steel sheets, or tin sheets. Notches 16a and 16b are formed at the lower end of the skirt wall 10, specifically on both sides of the base 14 of the flap 12. The flap 12 consists of a base 14 and an annular portion 18 attached to the base 14. The annular portion 18 of the flap 12 is formed using the base 14 as a core by injection molding or compression molding of any suitable synthetic resin material, such as polypropylene or polyethylene, so that the annular portion 18 can be attached to the base 14 during molding. If desired, the entire flap 12, together with the top wall 8 and skirt wall 10, can be integrally formed from a metal sheet.

[0032] A pair of notches 20a and 20b are formed on the cover 4, or more specifically on the area integrally formed from the metal sheet. Advantageously, the notches 20a and 20b are formed by machining the metal sheet from the back side using a tool that reduces the thickness of the metal sheet. The notches 20a and 20b include first portions 20a-1 and 20b-1, and also include second portions 20a-2 and 20b-2. The first portions 20a-1 and 20b-1 extend upward on the skirt wall 10 from the lower end of the skirt wall 10, more specifically from the notches 16a and 16b formed on both sides of the flap 12. The second portions 20a-2 and 20b-2, respectively immediately following the first portions 20a-1 and 20b-1, extend in an arc shape between the upper end of the skirt wall 10 and the periphery of the top wall 8. In the illustrated embodiment, the second portions 20a-2 and 20b-2 extend at the periphery of the top wall 8. In the illustrated embodiment, third portions 20a-3 and 20b-3 are further formed (see also...). Figure 3 The third parts 20a-3 and 20b-3, which immediately follow the second parts 20a-2 and 20b-2, extend to the skirt wall 10.

[0033] Figure 3 The metal sheet used to manufacture the top wall 8, skirt wall 10, and base 14 of the flap 12 of the cover body 4 is shown. Figure 3 The metal sheets in the middle have been stamped into the corresponding parts but have not yet been stretched. In other words, Figure 3 A surface of a metal sheet is shown, which defines the inner surfaces of the top wall 8 and the skirt wall 10 when the base 14 of the hinge tab 12 of the cover 4 is unfolded in a plane with the top wall 18 and the skirt wall 10. A pair of notches 20a and 20b can be made on the inner surfaces used to define the top wall 8 and the skirt wall 10 (e.g., Figure 3 Grooves are formed on the plane of the surface shown to advantageously reduce the thickness of the material while stamping the sheet into the desired shape or before / after stretching the sheet.

[0034] Alternatively, the notches 20a and 20b can be formed by creating grooves on the planes that define the outer surfaces of the top wall 8 and the skirt wall 10, thereby reducing the material thickness. However, this may cause breakage at the pair of notches 20a and 20b during the stretching of the metal sheet, particularly at the location where the arcuate portion 10a of the skirt wall 10 extends. In a pair of notches 20a and 20b, t1 represents the residual material thickness at the following locations of the first portions 20a-1 and 20b-1, ranging from the lower end of the skirt wall 10 of the first portions 20a-1 and 20b-1 beyond the upper end of the lower part 10b-1 of the linear portion 10b of the skirt wall 10 to the middle portion of the linear portion 10b excluding the lower part 10b-1; t2 represents the residual material thickness of the remaining portions of the first portions 20a-1 and 20b-1 (i.e., the portion other than the range from the lower end of the skirt wall 10 through the upper end of the lower part 10b-1 to the middle portion of the linear portion of the skirt wall 10 excluding the lower part 10b-1 of the linear portion 10b, and the portion where the arcuate portion 10 of the skirt wall 10 is located); t3 represents the residual material thickness at the second portions 20a-2 and 20b-2 and the third portions 20a-3 and 20b-3. Preferably, t1 is a larger value, t2 is an intermediate value, and t3 is a smaller value. For example, when the metal sheet is made of an aluminum-based alloy with a thickness of 0.24 mm, t1 is suitable to be in the range of about 170 to about 190 micrometers, t2 is in the range of about 155 to about 175 micrometers, and t3 is in the range of about 110 to about 130 micrometers.

[0035] Reference Figure 3 as well as Figure 1 and Figure 2 The following explanation is provided. Importantly, the first portions 20a-1 and 20b-1 of the pair of notches 20a and 20b extend straight and preferably vertically (i.e., parallel to the central axis of the container 2) from the lower end of the skirt wall 10 to the portion above the upper end of the lower portion 10b-1 of the linear portion 10b. Figure 3 In the illustrated embodiment, the first portions 20a-1 and 20b-1 of a pair of notches 20a and 20b extend straight and vertically from the lower end of the skirt wall 10 to the upper end of the linear portion 10b (in... Figure 3 (The upper part is indicated by a double-dotted line B). Figure 3 In the diagram, this area is indicated by markings 20a-1-1 and 20b-1-1. On the arcuate portion 10a of the skirt wall 10, the first portions 20a-1 and 20b-1 of a pair of notches 20a and 20b extend arcuately and circumferentially upward to both sides (which are... Figure 3 (The areas shown in the text are indicated by reference numerals 20a-1-2 and 20b-1-2).

[0036] Reference Figure 2The following description is provided. In this embodiment, the liner 6 is manufactured by applying a suitable synthetic resin material, such as soft polyethylene, to the inner surface of the top wall 8 of the cap 4 and pressing the synthetic resin material into the desired shape. The liner 6 is generally disc-shaped and has a relatively thin-walled central portion 22 and a relatively thick-walled peripheral portion 24. An inner annular seal 26 and an outer annular seal 28, both concentrically drooping, are formed on the thick-walled peripheral portion 24. Experiments by the inventors have shown that it is preferable to position the lower end of the outer annular seal 28 above the upper end of the linear portion 10b of the skirt wall 10 so that the internal pressure of the container can be released at a relatively early stage during the separation of the container cap 2 from the neck portion 32 of the container (see...). Figure 5 More specifically, the lower end of the outer annular seal 28 is at the same height as the vertical middle portion of the arcuate portion 10a of the skirt wall 10. The lower end of the inner annular seal 26 can also be positioned below the lower end of the outer annular seal 28 but above the upper end of the linear portion 10b of the skirt wall 10.

[0037] Figure 4 The relationship between the inner surface of the top wall 8 and the liner 6 is schematically shown. In the illustrated embodiment, an adhesive coating for bonding to the liner 6 is applied to the entire inner surface defining the inner surface of the top wall 8 (one surface of the base 14 of the flap 12, which is integrally formed with the top wall 8 and skirt wall 10 of the cover 4). Figure 4 In the diagram, the high-density dotted areas indicate areas where additional non-adhesive or weakly adhesive coating has been applied for bonding to the lining 6. (See also...) Figure 2 as well as Figure 4 It is understood that a non-adhesive or weakly adhesive coating is applied to a pair of arc-shaped areas 30a and 30b. These arc-shaped areas 30a and 30b exist along the second portions 20a-2 and 20b-2 of a pair of notches 20a and 20b, and cover the second portions 20a-2 and 20b-2 of the pair of notches 20a and 20b. Therefore, in the pair of arc-shaped areas 30a and 30b, the liner 6 is non-adhesive or weakly adhesive to the inner surface of the top wall 8 of the cover 4, while the liner 6 is adhesive to the remaining area of ​​the inner surface of the top wall 8 of the cover 4.

[0038] Figure 5The diagram shows the container lid 2 attached to the neck portion 32 of the container, with the neck portion 32 sealed. The container can be made of glass, any suitable synthetic resin such as polyethylene terephthalate, or metal sheet such as aluminum alloy. An annular locking ridge is formed at the outer peripheral end of the neck portion 32. To attach the container lid 2 to the neck portion 32 and seal it, the container lid 2 is mounted on the neck portion 32 and pressed downward so that the inner annular ridge 26 and the outer annular ridge 28 of the liner 6 are in close contact with the upper end of the neck portion 32. Then, the lower portion 10b-1 of the linear portion 10b of the skirt 10 is radially inwardly forged (deformed) to be locked by the lower surface 34a of the annular locking ridge 34 of the neck portion 32. In this way, the container lid 2 is attached to the neck portion 32 of the container to seal the neck portion 32.

[0039] When consuming the contents of the container, the container is opened by detaching the container lid 2 from the neck portion 32. In this case, the consumer hooks his finger around the annular portion 18 of the lid body 4 of the container lid 2 and pulls it radially outward and then upward. As a result, the first portions 20a-1 and 20b-1 of the pair of notches 20a and 20b break off near the upper end of the lower portion 10b-1 of the linear portion 10b of the skirt wall 10. At the same time, the broken portion between the first portions 20a-1 and 20b-1 of the pair of notches 20a and 20b at the lower portion 10b-1 of the linear portion 10b of the skirt wall 10 is moved radially outward and upward to be spaced apart from the annular locking ridge 34, thereby appropriately releasing the internal pressure of the container. At this time, the portion at the lower part 10b-1 of the linear portion 10b of the skirt wall 10, except for a specific area between the first portions 20a-1 and 20b-1 of the broken pair of notches 20a and 20b, is still locked by the lower surface 34a of the annular locking ridge 34 of the neck portion 32. This prevents the container lid 2 from suddenly flying off / falling. Furthermore, since the first portions 20a-1 and 20b-1 of the pair of notches 20a and 20b provided on the lower part 10b-1 of the linear portion 10b of the skirt wall 10 extend straight, they can be broken without applying excessive force. In contrast, in a conventional container lid, the pair of notches arc upwards and extend circumferentially to both sides of the lower part of the first portion of the skirt wall, such as... Figure 3 As shown by the double-dotted line X in the diagram. When the score line breaks at the lower part of the first portion of the skirt wall, at the portion that is circumferentially longer than the corresponding portion of this application, the lower part of the linear portion of the skirt wall shifts radially outward and upward, and the lower part separates from the neck portion. As a result, the locking force of the container cap 2 relative to the neck portion 32 will be excessively reduced, and this may lead to the risk of the container cap suddenly flying off / falling off. Furthermore, in the container cap, the lower part of the first portion of the skirt wall extends circumferentially to both sides and upward in an arc shape. This construction requires an upward force applied simultaneously to both circumferential sides to break, and therefore the breaking requires a relatively large force.

[0040] The annular portion 18 is further displaced upwards or in the opposite radial direction to further break the area except for the first portions 10a-1 and 10b-1 of the pair of notches 10a and 10b, and to break the second portions 10a-2 and 10b-2. As a result, the lower portion 10b-1 of the linear portion 10b of the skirt wall 10 is circumferentially spaced from the annular locking ridge 34 of the neck portion 32 by a certain length. Thus, the lower portion 10b-1 disengages from the neck portion 32 of the container lid 2, thereby releasing the neck portion 32 from its seal.

[0041] Example

[0042] A 0.24 mm thick aluminum alloy sheet is stamped into a shape with... Figure 3 The shape shown is then processed as needed, for example, stretched into the shape shown. Figure 1 and Figure 2 The cover shown has a top wall, a skirt wall, and a base for a hinged tab. A polypropylene ring is then compression-formed onto the base of the hinged tab, and a soft polyethylene liner is formed by pressing it onto the inner surface of the top wall, thereby creating a cover as shown. Figure 1 and Figure 2 The container lid shown has an outer diameter of 27.00 mm, an overall height of 7.00 mm for the skirt (excluding the flap), a vertical length of 4.26 mm for the linear portion of the skirt, and a vertical length of 1.75 mm for the lower portion of the linear portion. The lower end of the outer annular seal of the liner is positioned 1.20 mm above the upper end of the linear portion of the skirt, and the lower end of the inner annular seal of the liner is positioned 0.90 mm above the upper end of the linear portion of the skirt.

[0043] In a pair of notches, t1 represents the residual material thickness at a specific location, specifically the area extending from the lower end of the skirt wall of the first section beyond the upper end of the lower skirt wall to the middle portion of the linear section excluding the lower part; t2 represents the residual material thickness of the remaining portion of the first section; and t3 represents the residual material thickness of the second and third sections. Thickness t1 is 180 micrometers, thickness t2 is 165 micrometers, and thickness t3 is 120 micrometers. The radius of curvature of the portion of the pair of notches located at the arcuate part of the skirt wall is 5.00 millimeters.

[0044] Having such Figure 5 The glass container shown at the neck (nominal capacity: 120 ml) contains 120 ml of water with 3.4 volumes of carbonic acid. The container lid is as follows... Figure 5 The cap is attached to the neck of the container, and the neck is sealed. The container with the sealed neck was left to stand at 50°C for three days, after which the cap was detached from the neck to release the seal. This same procedure was performed on 150 containers, and no caps flew off or fell off upon detachment from the neck.

[0045] Comparative example

[0046] For comparison, the same experiment as in the above embodiment was performed on 150 containers, except that the shape of the first part of the pair of notches formed on the lid was different. Figure 1 and Figure 2 The double-dotted line X indicates a radius of curvature of 8.00 mm. The lower end of the outer annular seal of the liner is positioned 1.20 mm below the upper end of the linear portion of the skirt, and the lower end of the inner annular seal of the liner is positioned 0.90 mm above the upper end of the linear portion of the skirt. As a result, the lids of 15 containers flew off / fell violently when detached from the neck.

[0047] Letter or number explanation

[0048] 2: Container lid

[0049] 4: Cover

[0050] 6: Lining

[0051] 8: Top Wall

[0052] 10: Skirt

[0053] 10a: The curved part of the skirt wall

[0054] 10b: Linear part of the skirt wall

[0055] 10b-1: Lower part of the linear section

[0056] 12: Lifting tab

[0057] 14: Base of the flip-up tab

[0058] 16a: Notch

[0059] 16b: Notch

[0060] 18: Circular part

[0061] 20a: Scratches

[0062] 20b: Scratches

[0063] 20a-1: First part of the notch

[0064] 20b-1: First part of the notch

[0065] 20a-2: The second part of the indentation

[0066] 20b-2: Second part of the incision

[0067] 20a-3: The third part of the notch

[0068] 20b-3: The third part of the notch

[0069] 22: The central part of the thin-walled lining

[0070] 24: Thick-walled perimeter of the lining

[0071] 26: Inner annular seal

[0072] 28: Outer annular seal

[0073] 30a: Curved area where non-adhesive or weakly adhesive coating is applied

[0074] 30b: Curved area where non-adhesive or slightly adhesive coating is applied

[0075] 32: The neck of the container

[0076] 34: Annular locking part

Claims

1. An easy-open container lid for a container having a cylindrical neck, the cylindrical neck having an annular locking ridge formed at the upper end of its outer circumferential surface, wherein the neck is sealed to have positive internal pressure after the container is filled with a gaseous liquid. The container lid includes a lid body and an inner liner. The cover includes a flat, circular top wall, an arcuate portion extending radially outward and downward from the periphery of the top wall in a longitudinal sectional view, a linear portion extending vertically downward immediately following the arcuate portion, and a lifting tab extending from the lower end of the skirt. The top wall, the skirt wall, and at least the base of the lifting tab are integrally formed from a metal sheet and have a pair of grooves, each comprising a first portion and a second portion, wherein the first portion extends upward from both sides of the lifting tab on the skirt wall, and the second portion extends in an arc shape between the upper end of the skirt wall and the peripheral portion of the top wall. The liner is disc-shaped and made of synthetic resin, and is disposed on the inner surface of the top wall of the cover. The container lid is attached to the neck by forging the lower portion of the linear part of the skirt wall radially inward to below the locking ridge of the neck, wherein The first portion of each of the pair of notches extends vertically from the lower end of the skirt wall to a position above the upper end of the lower portion of the linear portion; t1>t2>t3, where t1 represents the residual material thickness at the following location of the first portion of the pair of notches, ranging from the upper end of the lower part of the skirt wall of the first portion beyond the lower part of the linear portion of the skirt wall to the middle part of the linear portion excluding the lower part; t2 represents the residual material thickness at the remaining portion of the first portion of the pair of notches; and t3 represents the residual material thickness at the second and third portions of the pair of notches.

2. The easy-open container lid according to claim 1, wherein t1 is from 170 micrometers to 190 micrometers, t2 is from 155 micrometers to 175 micrometers, and t3 is from 110 micrometers to 130 micrometers.

3. The easy-open container lid according to claim 1 or 2, wherein the first portion of each of the pair of grooves extends straight to the upper end of the linear portion of the skirt wall, and extends upward and arcuately at the arcuate portion of the skirt wall in a direction circumferentially spaced apart from each other.

4. The easy-open container lid of claim 1, wherein the liner is non-adhesive or weakly adhesive to the lid body and covers the pair of grooves in an arcuate region extending along the pair of grooves, while the liner is adhesive to the lid body in a region outside the pair of arcuate regions.

5. The easy-open container lid according to claim 1, wherein the liner has a thin-walled central portion and a thick-walled peripheral portion, the thick-walled peripheral portion having a lower surface, wherein an inner annular seal and an outer annular seal are formed on the lower surface, both concentrically hanging downwards, and the lower end of the outer annular seal is positioned above the upper end of the linear portion of the skirt wall.

6. The easy-open container lid according to claim 5, wherein the lower end of the outer annular seal is positioned at the same height as the vertical midpoint of the arcuate portion of the skirt.

7. The easy-open container cap according to claim 5 or 6, wherein the lower end of the inner annular seal is positioned below the lower end of the outer annular seal and above the upper end of the linear portion of the skirt.

Images