Container cover and processing method thereof

Abstract

The invention discloses a container cover and a processing method thereof.The container cover comprises an upper cover body and a lower cover body which are arranged in a stacked mode, a release layer is arranged between the upper cover body and the lower cover body, the upper cover body is provided with a first notch, and the first notch penetrates through the thickness of the upper cover body and defines a peelable part; the peelable part comprises a main body part and a first tongue piece arranged on the main body part. The second notch, corresponding to the first tongue piece, in the lower cover is designed to be in an arc shape sunken towards the center of the container cover, and L1gt is met; according to the geometric relationship of the first tongue piece root area and the second tongue piece root area, the acute angle structure which easily generates stress concentration is converted into the obtuse angle structure which is more uniform in stress dispersion, the bending deformation of the first tongue piece root in the die cutting material receiving and stacking transportation process is effectively avoided, and the product flatness is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of instant food packaging, in particular to a container cover and a processing method thereof. Background Art

[0002] Existing food container lids (such as instant noodle bowl lids) are often designed with a peelable structure to facilitate user opening. This peelable structure typically relies on a cut line (notch) in a specific area of the lid and a release layer applied to the entire area between the upper and lower lids to reduce the peeling force between the layers, thereby achieving controllable opening of the lid.

[0003] In some existing designs of peelable food container lids, such as patent CN205738834U, in order to form a tongue portion that can be pinched by the user to peel off, the cutting line is often designed to be straight. The geometric relationship between this straight cutting line and the edge of the tongue often results in the formation of an acute angle area with a smaller angle at the intersection of the root of the tongue and the cutting line. This design exposes some shortcomings in actual production and use. Especially after the lid is die-cut and formed, during the automatic material collection, stacking and subsequent packaging and transportation process, the above-mentioned acute angle area is easily affected by external pressure and deformed by bending, warping, etc. This deformation not only affects the appearance flatness and overall aesthetics of the product, reduces the product's sense of quality, but may also cause inconvenience to the subsequent automated packaging process or the consumer's experience.

[0004] Therefore, how to avoid or reduce the warping deformation of the tongue root while ensuring good peeling performance is a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0005] The main purpose of the present invention is to provide a container cover and a processing method thereof to solve the above technical problems.

[0006] In a first aspect, the present invention provides a container lid, comprising an upper lid and a lower lid stacked together, a release layer disposed between the upper lid and the lower lid, a first incision disposed on the upper lid, the first incision extending through the thickness of the upper lid and defining a peelable portion, the peelable portion comprising a main portion and a first tongue disposed on the main portion;

[0007] The lower cover is provided with a second cutout and a third cutout extending through the thickness thereof, wherein the second cutout is located in a region corresponding to the first tongue piece, and the third cutout is located in a region corresponding to the main portion of the peelable portion and forms a drainage hole membrane;

[0008] The second cutout is in an arc shape that is concave toward the center of the container cover, and a distance L1 from the midpoint of the outer edge of the first tongue piece to the maximum arc height of the second cutout is greater than a vertical distance L2 from the midpoint of the outer edge to the root of the first tongue piece;

[0009] Wherein, the release layer is arranged between the main body of the peelable part and the lower cover, and the drainage hole membrane and the main body of the peelable part are directly bonded.

[0010] Wherein, the release layer is provided with a plurality of holes penetrating the release layer in an inner area adjacent to the boundary.

[0011] Wherein, the release layer is provided between the upper cover and the lower cover in the root area of the first tongue piece.

[0012] The main body of the peelable portion and the first tongue piece are integrally formed, and the main body of the peelable portion is located within the covering area of the release layer.

[0013] Wherein, the third incision forms a plurality of drainage hole membranes arranged at intervals.

[0014] The upper cover includes a protective layer, an ink layer, a first printed film layer, an adhesive layer and a second printed film layer which are sequentially distributed from the outside to the inside.

[0015] The lower cover includes an adhesive layer, a barrier layer and a heat-sealing layer sequentially distributed from the outside to the inside, and the release layer is arranged between the second printed film layer and the adhesive layer.

[0016] The container cover is adapted to the container mouth and has two tongues extending radially outward, wherein the two tongues include a first tongue and a second tongue arranged opposite to the first tongue.

[0017] In a second aspect, the present invention further provides a method for processing the container lid according to the first aspect, comprising the following steps:

[0018] locally applying a release layer between the upper cover and the lower cover, such that the release layer is applied to an area between the main portion of the corresponding peelable portion and the lower cover, and is not applied to an area between the corresponding drainage hole membrane and the upper cover;

[0019] The upper cover and the lower cover with the release layer applied thereto are die-cut to form:

[0020] a first cutout extending through the thickness of the upper cover, wherein the first cutout defines the peelable portion, the peelable portion comprising a main portion and a first tongue disposed on the main portion;

[0021] a second cutout extending through the thickness of the lower cover, the second cutout being located in a region corresponding to the first tongue, the second cutout being in an arc shape that is concave toward the center of the container cover, and a distance L1 from the midpoint of the outer edge of the first tongue to the maximum arc height of the second cutout being greater than a vertical distance L2 from the midpoint of the outer edge to the root of the first tongue; and

[0022] A third cut is formed through the thickness of the lower cover, the third cut is located in a region corresponding to the main portion of the peelable portion, and forms the drainage hole membrane directly bonded to the main portion of the peelable portion.

[0023] Wherein, the die-cutting of the upper cover and the lower cover with the release layer applied thereon further comprises:

[0024] The upper cover and the lower cover are fully cut to form an outer contour of the container cover, wherein the outer contour includes the first tongue piece and a second tongue piece arranged opposite to the first tongue piece.

[0025] Beneficial technical effects of the present invention:

[0026] The present invention designs the second incision on the lower cover corresponding to the first tongue piece into an arc shape that is concave toward the center of the container cover and satisfies the geometric relationship L1>L2, so that the root area of the first tongue piece is transformed from an acute-angle structure that is prone to stress concentration to an obtuse-angle structure with more uniform stress dispersion, effectively avoiding the bending and deformation of the root area of the first tongue piece during the die-cutting, material collection, stacking and transportation processes, and ensuring the flatness of the product; at the same time, by only arranging the release layer between the peelable part and the lower cover, and maintaining a direct bonding connection between the drainage hole membrane and the upper cover, it is ensured that the peelable part can be easily peeled off, and that the drainage hole membrane is removed together with the peelable part, so that a drainage hole is reliably formed on the lower cover, avoiding the problem of residual drainage hole membrane or premature falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the upper cover of a container lid and its first cutout provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the lower cover of a container lid and its drainage hole membrane provided by an embodiment of the present invention;

[0030] Figure 3 for Figure 2An enlarged schematic diagram of the intersection of the first tongue and the second incision;

[0031] Figure 4 A schematic diagram of removing the peelable portion of a container lid provided by an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the release layer covering the container lid provided by an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of the interlayer structure of the upper cover and the lower cover of the container cover provided by an embodiment of the present invention;

[0034] Figure 7 Schematic diagram of a first die-cutting knife and a fourth die-cutting knife applicable to a container cover provided in an embodiment of the present invention;

[0035] Figure 8 A schematic diagram of a second die-cutting knife suitable for a container cover provided in an embodiment of the present invention;

[0036] Figure 9 A schematic diagram of another second die-cutting knife suitable for container lids provided in an embodiment of the present invention;

[0037] Figure 10 A schematic diagram of a second die cutter provided as a comparative example of the present invention;

[0038] Figure 11 A schematic diagram of another second die cutter provided as a comparative example of the present invention;

[0039] Figure 12 A schematic diagram of a second die cutter provided as a comparative example of the present invention;

[0040] Figure 13 A schematic diagram of a processing method provided by an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] In the figure: 100-upper cover, 200-lower cover, 300-release layer, 110-first incision, 120-peelable part, 121-first tongue piece, 122-second tongue piece, 210-second incision, 220-third incision, 221-drainage hole film, 222-drainage hole, 101-protective layer, 102-ink layer, 103-first printed film layer, 104-adhesive layer, 105-second printed film layer, 201-adhesive layer, 202-barrier layer, 203-heat sealing layer, 310-hole, 1001-first die-cutting knife, 1002-second die-cutting knife, 1003-third die-cutting knife, 1004-fourth die-cutting knife. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0045] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0046] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0047] Please also refer to Figures 1-12 The embodiment of the present invention provides a container cover that can be used in the field of convenient food packaging, and is particularly suitable for packaging such as instant noodle bowls that require a drainage function. The container cover includes an upper cover 100 and a lower cover 200 that are stacked, with a release layer 300 disposed between the upper cover 100 and the lower cover 200; the upper cover 100 is provided with a first incision 110, which passes through the thickness of the upper cover 100 and defines a peelable portion 120, which includes a main body and a first tongue 121 disposed on the main body; the lower cover 200 is provided with a second incision and a third incision that pass through its thickness, with the second incision being located in the area corresponding to the first tongue 121. The third incision is located in the area corresponding to the main part of the peelable part 120 and forms a drainage hole membrane 221; the second incision is an arc-shaped indentation toward the center of the container cover, and the distance L1 from the midpoint of the outer edge of the first tongue 121 to the maximum arc height of the second incision is greater than the vertical distance L2 from the midpoint of the outer edge to the root of the first tongue 121; wherein, the release layer 300 is arranged between the main part of the peelable part 120 and the lower cover 200, and the drainage hole membrane 221 and the main part of the peelable part 120 are directly bonded.

[0048] In this embodiment, the upper cover 100 and the lower cover 200 are laminated and bonded together to form an integral cover structure. A release layer 300 is provided between the upper cover 100 and the lower cover 200. The release layer 300 does not cover the entire interlayer area, but is provided locally.

[0049] The upper cover 100 is provided with a first cutout 110. This first cutout 110 is a cut line that runs through the entire thickness of the upper cover 100. Its trajectory forms a semi-enclosed area on the upper cover 100, thereby defining a peelable portion 120. The peelable portion 120 includes a main portion and a first tab 121 extending outward from the main portion. The first tab 121 extends in a predetermined direction, which may be radially outward, to facilitate the user's grasping and peeling operation.

[0050] The lower cover 200 is provided with a second notch 210 and a third notch 220, both of which extend through the thickness of the lower cover 200. The second notch 210 is located in the region corresponding to the first tab 121. That is, when the upper cover 100 and the lower cover 200 are stacked, the second notch 210 overlaps with the region of the first tab 121 in vertical projection. The third notch 220 is located in the region corresponding to the main portion of the removable portion 120. The third notch 220 forms a drainage hole membrane 221 on the lower cover 200.

[0051] Crucially, as Figure 2 and Figure 3 As shown, the second notch 210 is an arc-shaped indentation toward the center of the container lid. This arc-shaped design has specific geometric parameter relationships: let P1 be the midpoint of the outer edge of the first tongue 121, P2 be the maximum arc height of the second notch 210 (i.e., the most concave point of the arc), and L1 be the distance from P1 to P2. The root of the first tongue 121 can be understood as the connecting line formed by the two intersection points of the second notch 210 and the edge of the first tongue 121. The vertical distance from the midpoint of the outer edge P1 to this connecting line is L2. In this embodiment, L1 is greater than L2.

[0052] The placement of the release layer 300 is optional: it is placed between the main body of the peelable portion 120 and the lower cover 200 to reduce the interlayer peeling force in this area, allowing the user to easily remove the peelable portion 120. In contrast, the release layer 300 is not placed in the corresponding area between the drainage membrane 221 and the main body of the peelable portion 120. This results in a direct adhesive connection between the drainage membrane 221 and the upper cover 100, providing a stronger bond. This bond is stronger than the bond between the drainage membrane 221 and the rest of the lower cover 200.

[0053] In this embodiment, by designing the second notch 210 as an arc concave toward the center of the container lid and satisfying the geometric relationship L1 > L2, the transition at the base of the first tongue 121 becomes smoother, transforming the previously acute angle into an obtuse angle. This obtuse angle effectively disperses stress when subjected to external forces, preventing stress concentration and significantly reducing the likelihood of warping or deformation at the base of the tongue.

[0054] At the same time, the parameter relationship L1>L2 ensures that the arc-shaped recess has sufficient depth, increasing the angle formed by the first tongue 121 and the second notch 210, thereby enhancing the structural stability of this area. Even when subjected to certain external forces during the die-cutting, collecting, and stacking processes, the base of the first tongue 121 remains flat and is not easily deformed.

[0055] In addition, the local setting of the release layer 300 ensures that the peelable part 120 can be easily peeled off, and ensures that the drainage hole membrane 221 can be removed together with the peelable part 120, forming a complete drainage hole 222 on the lower cover 200, realizing a reliable drainage function, and avoiding the problem of the drainage hole membrane 221 remaining on the lower cover 200 or falling off prematurely.

[0056] In summary, this embodiment, through the specific arc design of the second incision 210 (satisfying L1>L2) and the selective setting of the release layer 300, not only effectively solves the problem of the tongue being easily bent and deformed in the prior art, but also improves the product appearance quality and the stability of production stacking, while ensuring the reliable realization of the drainage function, providing users with a better user experience.

[0057] In one embodiment, the release layer 300 is provided with a plurality of holes penetrating the release layer 300 in an inner region adjacent to the boundary.

[0058] In this embodiment, the overall contour of the release layer 300 corresponds to the area between the removable portion 120 and the lower cover 200 where the peeling force needs to be reduced. Near the edge of the release layer 300, that is, in an area close to but within the outer contour of the release layer 300, there are multiple holes 310. These holes 310 completely penetrate the thickness of the release layer 300, allowing the second printed film layer 105 of the upper cover 100 to directly contact and bond with the adhesive layer 201 of the lower cover 200 at the locations of these holes 310.

[0059] While the primary function of the release layer 300 is to reduce the peeling force between the removable portion 120 and the lower cover 200, if the peeling force is too weak, the removable portion 120 may accidentally open or partially fall off when not in use (e.g., during transportation or storage). By providing holes 310 on the inner edge of the release layer 300, these holes 310 create localized "anchor points," maintaining the original bond strength between the upper cover 100 and the lower cover 200 at these locations, thereby providing a moderate fixing effect.

[0060] Because the holes 310 are primarily located within the inner region of the release layer 300, they provide additional bonding points near the edge of the main portion of the peelable portion 120. This design effectively prevents the main portion of the peelable portion 120 from lifting or separating under external forces, thereby improving the integrity and sealing of the container lid when it is not opened.

[0061] When the user peels off the peelable portion 120, these holes 310 distributed along the inner edge provide a gradual peeling experience. Initial peeling requires overcoming the adhesive force at the holes 310. Once these "anchor points" are broken, the subsequent peeling process becomes smoother due to the presence of the large release layer 300. This design avoids the problem of an overly uniform peeling force resulting in a lack of a "tearing sensation," providing the user with clear feedback upon opening.

[0062] The presence of holes 310 prevents the release layer 300 from completely isolating the upper and lower covers, but instead forms a structure with alternating strong and weak adhesion areas. This structure ensures easy peelability while also enhancing the overall stability of the laminated structure, especially at the edges.

[0063] In practical applications, the shape of holes 310 can be circular, square, or other regular shapes, and their size, number, and distribution density can be adjusted based on specific product requirements. For example, for products requiring a greater initial peel force, the number or size of holes 310 can be increased; for products requiring a smoother peeling experience, the number of holes 310 can be appropriately reduced.

[0064] In one embodiment, a release layer is disposed between the upper cover 100 and the lower cover 200 in the root area of the first tongue 121 .

[0065] In this embodiment, the root area of the first tab 121 refers to the connection between the first tab 121 and the main portion of the removable portion 120, roughly corresponding to the locations on both sides of the second cutout 210 on the lower cover 200. The release layer 300 is applied not only to the main portion of the removable portion 120, but also to the root area of the first tab 121. This means that at the root area of the first tab 121, the second printed film layer 105 of the upper cover 100 and the adhesive layer 201 of the lower cover 200 are separably connected via the release layer 300, rather than directly bonded.

[0066] Such a configuration ensures that when the user pinches the first tongue piece 121 and peels the peelable portion 120 upward, the first tongue piece 121 and its root can be separated from the lower cover 200 smoothly with a low peeling force, thereby achieving easy peeling of the entire peelable portion.

[0067] In this embodiment, in order to ensure a certain degree of adhesion between the first tongue 121 and the lower cover 200 before being opened to avoid accidental opening, the release layer 300 may not be provided at the end region of the first tongue 121, so that the end maintains a strong bond with the corresponding portion of the lower cover 200. However, this does not affect the easy-to-peel effect achieved by providing the release layer 300 at the root region. The end region of the first tongue 121 is the region between the second incision 210 and the two sides of the first tongue 121. In this end region, the second printed film layer 105 of the upper cover 100 directly contacts and bonds with the adhesive layer 201 of the lower cover 200, maintaining the original bonding strength of the material itself. By maintaining direct bonding at the end, the opening of the first tongue 121 when not in use is effectively ensured, avoiding potential food safety hazards.

[0068] In one embodiment, the main portion of the peelable portion 120 and the first tongue piece 121 are integrally formed, and the main portion of the peelable portion 120 is located within the coverage area of the release layer 300 .

[0069] In this embodiment, “integrally formed” means that the main body and the first tongue piece 121 are a continuous structure formed by the same piece of material of the upper cover 100 , and are not spliced or assembled later.

[0070] The main portion of the peelable portion 120 is defined by the first cut 110 on the upper lid 100. The first cut 110 is a cut line that penetrates the thickness of the upper lid 100, forming a semi-enclosed area that serves as the main portion of the peelable portion 120. The first tab 121 is an outward extension formed by cutting the outer contour of the container lid (i.e., by a full cut by the fourth die cutter 1004). It connects to the main portion and together form the complete peelable portion 120.

[0071] The main portion of the peelable portion 120 is located within the coverage area of the release layer 300. This means that the release layer 300 is applied to the overlapping area corresponding to the main portion of the peelable portion 120 (i.e., the area defined by the first incision 110) and the lower cover 200, ensuring that the main portion can be peeled off from the lower cover 200 with a relatively small peeling force.

[0072] In this embodiment, the overall dimensions of the outer perimeter of the main portion of the removable portion 120 are designed to be smaller than the outer edge dimensions of the actual coated area of the release layer 300. In other words, the coated area of the release layer 300 completely covers the main portion of the removable portion 120, with a certain margin outside the edge of the main portion.

[0073] During actual production, there may be some tolerance between the coating position of the release layer 300 and the cutting position of the first incision 110. By ensuring that the coating area of the release layer 300 is larger than the outline of the main portion of the removable portion 120, even if there is a positional deviation, the entire main portion can still be covered by the release layer 300. If the edge of the main portion of the removable portion 120 coincides with or exceeds the edge of the release layer 300, this edge area may not be covered by the release layer 300, resulting in localized excessive adhesion and affecting the smoothness of the peel. By ensuring that the coverage area of the release layer 300 is larger than the main portion, this situation can be avoided.

[0074] In one embodiment, the third incision forms a plurality of drainage hole membranes 221 that are spaced apart.

[0075] In this embodiment, the third incision 220 is not a single large incision, but rather a plurality of independent closed incision lines, forming a plurality of mutually separated drainage membranes 221 on the lower cover 200. Each drainage membrane 221 is an independent area defined by a closed incision line. These drainage membranes 221 are arranged in an array within the area corresponding to the main portion of the removable portion 120, maintaining a certain distance between each other.

[0076] The drainage hole membranes 221 can be designed to have the same or different shapes and sizes. For example, they can all be circular, square, oval, or other regular shapes. They can be arranged in a regular matrix or in other distribution patterns.

[0077] Compared to a single large hole, multiple drainage holes 222 provide a more uniform drainage path. When liquid in the container needs to be drained, it can flow out from multiple locations simultaneously, greatly improving drainage speed and efficiency. Furthermore, compared to a single large hole, multiple smaller drainage holes 222 can more effectively prevent solid particles in food (such as noodles and vegetables) from passing through, achieving liquid-solid separation.

[0078] In one embodiment, the upper cover 100 includes a protective layer 101 , an ink layer 102 , a first printed film layer 103 , an adhesive layer 104 , and a second printed film layer 105 , which are sequentially arranged from the outside to the inside.

[0079] In this embodiment, the upper cover 100 is a multi-layer composite structure, and its specific layers, from the outside to the inside, that is, from the side in contact with the external environment to the side in contact with the lower cover 200, include:

[0080] Protective layer 101: The outermost layer, made of PET (polyethylene terephthalate) film or printing varnish. Ink layer 102: Located inside protective layer 101, formed through a printing process. First printed film layer 103: Located inside ink layer 102, it serves as the substrate for ink layer 102. Adhesive layer 104: Located inside first printed film layer 103, it securely bonds first printed film layer 103 to subsequent second printed film layer 105. Second printed film layer 105: Located inside adhesive layer 104, it forms the innermost layer of upper cover 100.

[0081] This embodiment adopts the design of the upper cover 100 with a multi-layer composite structure, which not only meets the basic functional requirements of the container cover, but also provides excellent performance.

[0082] In one embodiment, the lower cover 200 includes an adhesive layer 201 , a barrier layer 202 , and a heat-sealing layer 203 , which are sequentially distributed from the outside to the inside. The release layer 300 is disposed between the second printed film layer 105 and the adhesive layer 201 .

[0083] In this embodiment, the lower cover 200 is also a multi-layer composite structure, and its specific layers from the outside to the inside, that is, from the side in contact with the upper cover 100 to the side heat-sealed with the container mouth, include:

[0084] Adhesive layer 201: The outermost layer of the lower cover 200, which is in direct contact with the upper cover 100 (or the release layer 300 thereon). The main function of this layer is to provide adhesion to the upper cover 100 (in areas without release agent) or to serve as a carrier surface for the release agent. Barrier layer 202: Located on the inner side of the adhesive layer 201, it is used to provide barrier properties against oxygen, water vapor, light, etc., to protect the flavor and quality of the food in the bowl and extend the shelf life. Heat sealing layer 203: Located on the inner side of the barrier layer 202, which is the innermost layer of the lower cover 200. This layer of material has good heat sealing properties and can be fused to the mouth of a matching container (such as a paper bowl or plastic bowl) under heating and pressurization conditions to form a reliable seal.

[0085] Crucially, the release layer 300 is positioned between the outer surface (i.e., the downward-facing side) of the second printed film layer 105 of the upper cover 100 and the outer surface (i.e., the upward-facing side) of the adhesive layer 201 of the lower cover 200. In other words, when the upper cover 100 and the lower cover 200 are stacked, the release layer 300 is sandwiched between the second printed film layer 105 and the adhesive layer 201, effectively reducing the interlayer adhesion at the location where separation is required without affecting the functions of other layers.

[0086] In one embodiment, the container cover is adapted to the container mouth and has two tongues extending radially outward, wherein the two tongues include a first tongue 121 and a second tongue 122 disposed opposite to the first tongue 121 .

[0087] In this embodiment, the container lid is designed to fit snugly over the container mouth. The container can be a noodle bowl, soup cup, or other food container requiring sealing and drainage. The main contour of the container lid matches the shape of the container mouth, typically circular, but can also be designed to be oval, square, or other suitable shapes depending on the actual shape of the container mouth.

[0088] The container cap has two tongues extending radially outward. These two tongues protrude outward from the main contour of the container cap, forming a structure that is convenient for users to grasp. Specifically:

[0089] The first tab is the first tab 121 in the aforementioned embodiment, which is an integral part of the peelable portion 120 and extends radially outward. As previously mentioned, the primary function of the first tab 121 is to provide a gripping point for the user to peel off the peelable portion 120, thereby achieving partial opening and drainage of the container lid.

[0090] The second tongue, 122, is positioned opposite the first tongue 121. "Oppositely positioned" means that the second tongue 122 and the first tongue 121 are approximately 180 degrees symmetrically spaced about the circumference of the container lid, i.e., the two tongues are located at opposite ends of the container lid's diameter. The second tongue 122 also extends radially outward, and its extension length and width can be the same or similar to those of the first tongue 121 to maintain the container lid's symmetrical appearance.

[0091] This design not only ensures the drainage and anti-bending properties of the aforementioned embodiments, but also improves overall opening convenience. The user can pinch the first tab 121 to peel off the removable portion 120 to drain water, or pinch the second tab 122 to peel the entire lid off the container.

[0092] like Figure 13 As shown, corresponding to the above container cover, an embodiment of the present invention further provides a method for processing a container cover, which is used to manufacture the container cover as described in the above embodiment. The method mainly includes the following steps:

[0093] S1: Locally apply the release layer 300 between the upper cover 100 and the lower cover 200 so that the release layer 300 is applied to the area between the main part of the corresponding peelable part 120 and the lower cover 200, and is not applied to the area between the corresponding drainage hole membrane 221 and the upper cover 100.

[0094] First, prepare the materials for the upper cover 100 and lower cover 200. The upper cover 100 has a multi-layer composite structure, including, from the outside to the inside, a protective layer 101, an ink layer 102, a first printed film layer 103, an adhesive layer 104, and a second printed film layer 105. The lower cover 200 also has a multi-layer composite structure, including, from the outside to the inside, an adhesive layer 201, a barrier layer 202, and a heat seal layer 203.

[0095] In this step, a release layer 300 is locally applied between the second printed film layer 105 of the upper cover 100 and the adhesive layer 201 of the lower cover 200. Specifically:

[0096] Application area of release layer 300: The release layer 300 is applied to the area between the main portion of the peelable portion 120 and the lower cover 200. This ensures that the peelable portion 120 can be peeled off from the lower cover 200 with a small peeling force.

[0097] Non-application area of release layer 300: The release layer 300 is not applied in the area between the corresponding drainage hole membrane 221 and the upper cover 100. This selective local application ensures that the drainage hole membrane 221 and the upper cover 100 maintain a direct adhesive connection with a strong bonding force.

[0098] After the release agent is partially applied, the upper cover 100 and lower cover 200 materials are aligned and laminated, with their adhesive layers 201 forming a bond in the areas where the release agent has not been applied. In the areas where the release agent has been applied, an easily peelable interface is formed. The resulting composite film roll is a semi-finished product consisting of the upper cover 100, lower cover 200, and a partial release layer 300.

[0099] S2: Die-cutting the upper cover 100 and the lower cover 200 to which the release layer 300 is applied.

[0100] The prepared composite film roll semi-finished product is fed into a die-cutting device and die-cut using a die-cutting plate. The die-cutting plate includes an upper die-cutting plate and a lower die-cutting plate. The upper die-cutting plate includes a first die-cutting blade 1001, and the lower die-cutting plate includes a second die-cutting blade 1002 and a third die-cutting blade 1003. Through one or more die-cutting stamping operations, the following incision structure is formed on the composite film roll:

[0101] Forming a first cut 110: The composite film roll is cut using a first die cutter 1001. The first die cutter 1001 is configured to penetrate only the thickness of the upper cover 100 without damaging the lower cover 200. The trajectory of the first cut 110 defines a peelable portion 120, which includes a main portion and a first tab 121 disposed on the main portion.

[0102] Forming the Second Incision 210: The composite film roll is cut using the second die-cutter 1002. The second die-cutter 1002 is configured to penetrate only the thickness of the lower cover 200, without damaging the upper cover 100. The second incision 210 is located in the area corresponding to the first tongue 121. The cutting edge of the second die-cutter 1002 is designed to be arc-shaped, concave toward the center of the container cover. Its geometric parameters ensure that the distance L1 from the midpoint of the outer edge of the final first tongue 121 to the maximum arc height of the second incision 210 is greater than the vertical distance L2 from the midpoint of the outer edge to the base of the first tongue 121.

[0103] Forming the third incision 220: The composite film roll is cut using the third die cutter 1003. This third die cutter 1003 is also configured to penetrate only the thickness of the lower cover 200, leaving the upper cover 100 undamaged. The third incision 220 is located in the area corresponding to the main portion of the removable portion 120, forming a drainage hole membrane 221 on the lower cover 200. Because the release layer 300 is not applied in this area, the drainage hole membrane 221 is directly bonded to the main portion of the removable portion 120.

[0104] In actual production, the formation of the first, second, and third cuts can be accomplished at one or more die-cutting stations by designing blades with different heights and shapes. For example, the height of the first die-cutting blade 1001 is designed to just cut through the upper cover 100, and the heights of the second die-cutting blade 1002 and the third die-cutting blade 1003 are designed to just cut through the lower cover 200.

[0105] Through the above steps, a container lid can be processed on the composite film roll. This processing method, by controlling the application area of the release layer 300 and combining it with a die-cutting process with a specific geometry and cutting depth, can efficiently produce a container lid with the desired anti-bending and warping properties (due to the second incision design with L1>L2) and reliable drainage function (due to the direct adhesion of the drainage hole film 221 to the main portion of the peelable portion 120), thus overcoming the shortcomings of the existing technology.

[0106] In one embodiment, die-cutting the upper cover 100 and the lower cover 200 to which the release layer 300 is applied further includes: fully cutting the upper cover 100 and the lower cover 200 to form the outer contour of the container cover, the outer contour including the first tongue piece 121 and the second tongue piece 122 arranged opposite to the first tongue piece 121.

[0107] In this embodiment, in the step of die-cutting the upper cover 100 and the lower cover 200 to which the release layer 300 is applied, in addition to forming the first incision 110, the second incision 210 and the third incision 220, it also includes a process of fully cutting the upper cover 100 and the lower cover 200 to form the outer contour of the container cover.

[0108] Specifically, the full cutting process is achieved by the fourth die cutter 1004 belonging to the upper die cutter plate. The fourth die cutter 1004 is configured to simultaneously penetrate the entire thickness of the upper cover 100 and the lower cover 200, and the shape of its blade corresponds to the final desired shape of the container cover.

[0109] The container lid has a profile designed to fit the mouth of a specific container (e.g., an instant noodle bowl), such as a circular, oval, or other shape that matches the mouth of the container. The profile also includes a first tongue 121 and a second tongue 122 disposed opposite the first tongue 121.

[0110] This means that during the die-cutting process, the container lid with the aforementioned internal functional cutout is completely punched out of the composite film roll through full-depth cutting. This punching process not only defines the main contour of the container lid, but also forms the first tongue piece 121 and the second tongue piece 122 extending radially outward from the main contour of the container lid.

[0111] In the design of the die-cutting knife plate, the first die-cutting knife 1001, the second die-cutting knife 1002, the third die-cutting knife 1003 and the fourth die-cutting knife 1004 can complete the processing of all cuts and the punching of the outer contours through one or multiple closely connected stamping actions.

[0112] This embodiment adds the step of full cutting to form the outer contour of the container lid (including the first tongue piece 121 and the second tongue piece 122), so that the processed container lid not only has the expected functional characteristics, but also has a complete appearance and a structure that is easy to open as a whole, making the production process more efficient and integrated.

[0113] In a specific embodiment, in order to verify the actual effect of the arc-shaped design (L1>L2) of the second notch 210 in the embodiment of the present invention on solving the warping problem of the root of the first tongue, the following comparative test was conducted.

[0114] Experimental Example 1: Effects of different shapes of the second incision on the warping of the root of the first tongue piece 121 .

[0115] For comparison, except for the parameters shown in Table 1, all other processing parameters, materials used, and the first die cutter for forming the first incision were kept the same or substantially the same. Multiple groups of container lid samples were prepared according to the processing method of the present invention. As shown in Table 1, the incision shapes of each group of samples (Examples 1-1 to 3-4) differed only in the model of the second die cutter 1002 for forming the second incision (corresponding to Figures 8 to 12 ), thereby obtaining a second incision of a different shape.

[0116] Among them, the use of Figure 8 The sample of the second die cutter 1002 (Example 1-1) shown in FIG. 1 shows a second incision in the shape of an arc concave toward the center of the container cover, satisfying the condition of L1>L2; Figure 9 The sample of the second die cutter 1002 (Example 2-1) shown in FIG. 1 also has a second incision in the shape of an arc concave toward the center of the container cover, satisfying the condition of L1>L2; while the sample of the second die cutter 1002 (Example 2-1) shown in FIG. Figures 10 to 12 The second cuts of the samples of the second die-cutting knife 1002 shown have different shapes, and none of them are in the shape of an arc concave toward the center of the container lid. Figure 8 and Figure 9 The second cuts shown have the same arc chord length and different center distances, but they both satisfy the condition L1>L2.

[0117] After die-cutting, the container lid samples were processed according to the actual production process: first, automatic material collection, then sample handling and stacking, etc., to simulate the stacking and storage conditions in actual production. After a period of time, samples were removed from different positions in the stack and visually inspected for the heat seal surface of the container lid. The degree of localized warping at the ends of the second cut (i.e., the base of the first tongue 121) was recorded according to the following standards: Level 0 (no warping), Level 1 (warping is present but not noticeable), Level 2 (slight warping), and Level 3 (severe warping).

[0118] The test results are shown in Table 1:

[0119]

[0120] in conclusion:

[0121] The choice of heat seal layer during processing has little effect on the warping problem. What really affects the degree of warping is the shape design of the second incision. When the second incision is designed to be an arc shape concave toward the center of the container lid and meets the geometric relationship of L1>L2, if the second incision is used, Figure 8 、 Figure 9 The second die-cutting knife can improve the local warping phenomenon at the root of the first tongue, and the warping degree is level 0-1; when the second incision adopts other shape designs, the warping problem at the root of the first tongue is more obvious, and the warping degree reaches level 2-3.

[0122] The above test results fully demonstrate that the embodiment of the present invention effectively solves the technical problem of the tongue root being easily bent and deformed in the prior art through the specific second incision arc design (L1>L2), and significantly improves product quality.

[0123] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A container cover comprising an upper cover and a lower cover arranged in a stacked manner, wherein a release layer is provided between the upper cover and the lower cover, wherein: The upper cover is provided with a first incision, the first incision penetrates the thickness of the upper cover and defines a peelable portion, the peelable portion includes a main portion and a first tongue provided on the main portion; The lower cover is provided with a second cutout and a third cutout extending through the thickness thereof, wherein the second cutout is located in a region corresponding to the first tongue piece, and the third cutout is located in a region corresponding to the main portion of the peelable portion and forms a drainage hole membrane; The second cutout is in an arc shape that is concave toward the center of the container cover, and a distance L1 from the midpoint of the outer edge of the first tongue piece to the maximum arc height of the second cutout is greater than a vertical distance L2 from the midpoint of the outer edge to the root of the first tongue piece; Wherein, the release layer is arranged between the main body of the peelable part and the lower cover, and the drainage hole membrane and the main body of the peelable part are directly bonded.

2. The container cover according to claim 1, wherein: The release layer is provided with a plurality of holes penetrating the release layer in an inner area adjacent to the boundary.

3. The container cap according to claim 1, wherein: The release layer is provided between the upper cover and the lower cover in the root area of the first tongue piece.

4. The container cover according to claim 1, wherein: The main body of the peelable portion and the first tongue piece are integrally formed, and the main body of the peelable portion is located in the covering area of the release layer.

5. The container cap according to claim 1, wherein: The third incision forms a plurality of drainage hole membranes that are spaced apart.

6. The container cap according to claim 1, wherein: The upper cover includes a protective layer, an ink layer, a first printing film layer, an adhesive layer and a second printing film layer which are sequentially distributed from the outside to the inside.

7. The container cap according to claim 6, wherein: The lower cover includes an adhesive layer, a barrier layer and a heat-sealing layer which are sequentially distributed from the outside to the inside, and the release layer is arranged between the second printed film layer and the adhesive layer.

8. The container lid according to any one of claims 1 to 7, characterized in that: The container cover is adapted to the container mouth and has two tongues extending radially outward. The two tongues include a first tongue and a second tongue arranged opposite to the first tongue.

9. A method for processing a container cap according to any one of claims 1 to 8, characterized in that: The following steps are involved: locally applying a release layer between the upper cover and the lower cover, such that the release layer is applied to an area between the main portion of the corresponding peelable portion and the lower cover, and is not applied to an area between the corresponding drainage hole membrane and the upper cover; The upper cover and the lower cover with the release layer applied thereto are die-cut to form: a first cutout extending through the thickness of the upper cover, wherein the first cutout defines the peelable portion, the peelable portion comprising a main portion and a first tongue disposed on the main portion; a second cutout extending through the thickness of the lower cover, the second cutout being located in a region corresponding to the first tongue, the second cutout being in an arc shape that is concave toward the center of the container cover, and a distance L1 from the midpoint of the outer edge of the first tongue to the maximum arc height of the second cutout being greater than a vertical distance L2 from the midpoint of the outer edge to the root of the first tongue; and A third cut is formed through the thickness of the lower cover, the third cut is located in a region corresponding to the main portion of the peelable portion, and forms the drainage hole membrane directly bonded to the main portion of the peelable portion.

10. The processing method according to claim 9, characterized in that: The die-cutting of the upper cover and the lower cover with the release layer applied thereon further comprises: The upper cover and the lower cover are fully cut to form an outer contour of the container cover, wherein the outer contour includes the first tongue piece and a second tongue piece arranged opposite to the first tongue piece.

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