Breathable paper cover

Abstract

A breathable paper lid is suitable for covering a cup body that defines a space. The breathable paper lid includes a top wall, a tear line, and a waterproof and breathable element. The top wall is made of paper material and includes a body and an extension. The body has a front end and at least one vent hole communicating with the space and the outside. The extension has a connecting section connecting to the front end and at least one tear corner connecting to the connecting section. The tear corner protrudes from the front end in a left-right direction. The waterproof and breathable element faces the top wall and covers the at least one vent hole, allowing the space to ventilate or dissipate heat. Hereby, hot air within the space can escape to the outside through the at least one vent hole, achieving the function of ventilation. Furthermore, the waterproof and breathable element also prevents beverage leakage within the space.

Description

[Technical Field]

[0001] This invention relates to a cup lid, and more particularly to a breathable paper lid. [Previous Technology]

[0002] An existing beverage container includes a cup body for holding a beverage and a cap made of plastic material that is affixed to the top side of the cup body. The merchant achieves the packaging function by placing the cup body in a sealing machine and using the sealing machine to seal the cap to the top side of the cup body by heat pressing.

[0003] However, since the cap is made of plastic, it is difficult to recycle and decompose after use, which puts a burden on the environment and is not environmentally friendly. In addition, when the cup is filled with hot drinks, hot air can easily accumulate inside the cup, causing the cap to deform and affecting the sealing effect, and even causing the risk of liquid spillage or burns when drinking. [Summary of the Invention]

[0004] Therefore, the object of the present invention is to provide a breathable paper cover that is breathable and environmentally friendly.

[0005] Therefore, the breathable paper cover of the present invention is suitable for covering a cup body that surrounds and defines a space. The breathable paper cover includes a top wall, a tear line, and a waterproof and breathable element.

[0006] The top wall is made of paper material and has an outer surface and an inner surface arranged in opposite directions along a vertical axis. The inner surface is adapted to face the space. The top wall includes a body and an extension piece connecting the body. The body has at least one vent hole penetrating the outer surface and the inner surface and communicating the space with the outside, and an outer edge adapted to connect to the cup body. The outer edge has a front end. The extension piece has a connecting section connecting to the front end and at least one tear angle connecting to the connecting section. The tear angle protrudes from the front end of the body in a left-right direction intersecting the vertical axis.

[0007] The tear line disconnectably connects the front end of the body to the connecting segment. When the tear line is broken, the front end and the cup body cooperate to define a drinking opening that connects the space to the outside. When the tear line connects the front end and the connecting segment, the connecting segment closes the drinking opening.

[0008] The waterproof and breathable component faces the inner surface of the top wall and covers the at least one vent. The waterproof and breathable component is located between the space and the body in the vertical direction and is used to allow the space to breathe or dissipate heat.

[0009] The advantages of this invention are:

[0010] 1. Since the top wall is made of paper material, it is more environmentally friendly than the existing plastic cover.

[0011] 2. The space is connected to the outside through at least one vent, and the waterproof and breathable component allows the space to breathe or dissipate heat. This allows hot air in the space to escape to the outside through the at least one vent, achieving the effect of ventilation. Furthermore, compared to omitting the waterproof and breathable component and directly opening the vents in the top wall, the waterproof and breathable component can also prevent beverages from leaking out of the space.

[0012] 3. When the consumer wants to drink, he / she only needs to hold the tear corner and tear the extension piece off the main body along the tear line to open the drinking spout and drink directly from the mouth. The operation is very convenient.

Implementation Method

[0013] Referring to Figures 1, 2, and 3, a first embodiment of the breathable paper lid of the present invention is suitable for covering a cup body 9. The cup body 9 surrounds and defines a space 90 for holding a beverage and has a generally circular rim 91 located on the top side. The breathable paper lid includes a top wall 1, a tear line 2, an adhesive film 3, and a waterproof and breathable element 4.

[0014] The top wall 1 is made of paper material and has an outer surface 11 and an inner surface 12 opposite to the outer surface 11 in a vertical direction Z. The inner surface 12 is adapted to face the space 90. The top wall 1 includes a body 13 that can partially shield the space 90 and an extension 14 connected to the body 13.

[0015] Referring to Figures 1, 3, and 4, the body 13 has several vent holes 131 penetrating the outer surface 11 and the inner surface 12 and communicating the space 90 with the outside, an outer edge 132 suitable for connecting the cup body 9, and several contacting joints 134 that can periodically define a slot 133. The outer edge 132 has a front end 135. The slot 133 is spaced apart from the vent holes 131 along a front-back direction Y intersecting the vertical direction Z, and is suitable for inserting a straw (not shown).

[0016] Referring to Figures 1, 2, and 3, the extension piece 14 has two opposite ends separated by a distance D1 along the left-right direction X, and has a connecting segment 141 connecting to the front end 135, and two tear angles 142 connecting to the connecting segment 141. These tear angles 142 protrude from the front end 135 of the body 13 along the left-right direction X. In this first embodiment, the bottom portion of the connecting segment 141 is connected to the cup rim 91 of the cup body 9, and the tear angles 142 are respectively connected to the two opposite ends of the connecting segment 141 along the left-right direction X, and each tear angle 142 cooperates with the outer edge 132 to define a notch 140. The left-right direction X intersects the up-down direction Z and the front-back direction Y, and is substantially perpendicular to the up-down direction Z and the front-back direction Y.

[0017] Since the top wall 1 is made of paper material, it is more environmentally friendly than the existing plastic cap.

[0018] Referring to Figures 3, 5, and 6, the tear line 2 is generally arc-shaped and disconnectably connects the front end 135 of the body 13 to the connecting segment 141 of the extension piece 14. The two opposite ends of the tear line 2 are separated by a first length L1 along the left-right direction X, where D1:L1 is between 1:0.8 and 1:0.3, for example, 1:0.8. When the tear line 2 is broken, the front end 135 cooperates with the cup body 9 to define a drinking opening 10 connecting the space 90 to the outside. When the tear line 2 connects the front end 135 and the connecting segment 141, the connecting segment 141 closes the drinking opening 10.

[0019] In this first embodiment, the tear line 2 is configured as an arc-shaped, discontinuous cutting line with several spaced cuts 21. However, in other embodiments, the tear line 2 can also be a straight line extending along the left-right direction X, an easy-tear line, a raised or recessed cutting line, or a seam line, as long as it can achieve the function of connection and easy disconnection. This first embodiment is not limited to this.

[0020] Referring to Figures 1, 4, and 5, the adhesive film 3 is formed on the inner surface 12 of the top wall 1 and is adapted to face the space 90. The vent holes 131 also penetrate the adhesive film 3 in the vertical direction Z. In this first embodiment, the adhesive film 3 is, for example, a complete plastic film made of polyethylene (PE) or polypropylene (PP), which has good high temperature resistance and grease resistance, and is commonly used in paper lunch boxes or coffee cups for holding hot food. For clarity, Figure 5 shows the adhesive film 3 separated from the top wall 1. However, in actual production, the adhesive film 3 is directly applied to the inner surface 12 of the top wall 1 in one piece. The manufacturer then uses a cutting mold (not shown) to pierce the top wall 1 and the adhesive film 3, so that the vent holes 131 and the slots 133 simultaneously penetrate the body 13 of the top wall 1 and the adhesive film 3. Since those skilled in the art can deduce the details of manufacturing the adhesive film 3 and the expansion details of the top wall 1 from the above description, no further explanation is needed.

[0021] Referring to Figures 1, 3, and 4, the waterproof and breathable component 4 faces the inner surface 12 of the top wall 1 and covers the venting holes 131. The waterproof and breathable component 4 is located between the space 90 and the body 13 along the vertical direction Z, and is connected to the membrane 3 on the side opposite to the space 90 along the vertical direction Z. In this first embodiment, the waterproof and breathable component 4 is used to allow the space 90 to breathe or dissipate heat, and is configured as any one of filter paper, waterproof and breathable paper, breathable cotton, waterproof and breathable fabric, or non-woven fabric.

[0022] Accordingly, the space 90 is connected to the outside through the vents 131, and the waterproof and breathable component 4 is designed to allow the space 90 to breathe or dissipate heat, so that the heat inside the space 90 can escape to the outside through the vents 131, thus achieving the effect of ventilation. In addition, compared to omitting the waterproof and breathable component 4 and directly opening the vents 131 on the top wall 1, the waterproof and breathable component 4 can also achieve the effect of preventing beverages inside the space 90 from leaking out.

[0023] It should be noted that in this first embodiment, the waterproof and breathable component 4 is designed as an elliptical sheet, but its shape is not limited to this. The waterproof and breathable component 4 can also be circular, rectangular, or other geometric shapes, as long as it can achieve the function of covering the vent holes 131. In addition, in this first embodiment, the number of vent holes 131 is two and they are spaced apart along the left-right direction X, but this is not a limitation. In other embodiments, the number of vent holes 131 can also be one or more, and the vent holes 131 can also be spaced apart along the front-back direction Y or arranged in a ring. Manufacturers can freely change the number and arrangement of the vent holes 131 according to production needs.

[0024] Referring to Figures 3, 6, and 7, in use, the merchant first places the beverage in the space 90, and then uses a sealing machine 6 to fix the outer edge 132 of the top wall 1 to the cup rim 91 of the cup body 9 through a hot pressing process, achieving the effect of sealing and packaging. When the consumer wants to drink, they first lift one of the tear corners 142, and then tear the connecting section 141 off the front end 135 of the main body 13 along the tear line 2, so that they can drink the beverage contained in the space 90 from the drinking spout 10 and drink it directly from their mouth. Therefore, this first embodiment also has the effect of being easy to operate.

[0025] It is worth mentioning that the sealing machine 6 has an upward-facing opening 60 for placing the cup body 9, and several positioning protrusions 61 located on the left and right sides of the opening 60. When the top wall 1 of this first embodiment is placed on the top of the cup body 9, the positioning protrusions 61 of the sealing machine 6 can serve as positioning points for the notches 140. Therefore, when the merchant places the top wall 1 on the cup body 9, the notches 140 can be aligned with the positioning protrusions 61 along the vertical direction Z, achieving the function of positioning the first embodiment on the sealing machine 6. Thus, this first embodiment also helps the merchant position the top wall 1 on the sealing machine 6, making it highly practical.

[0026] In this first embodiment, there are two tear corners 142, which are respectively connected to two opposite ends of the connecting segment 141 along the left-right direction X. However, in other embodiments, as shown in FIG8, there may also be only one tear corner 142, which is formed at one end of the connecting segment 141. In this way, the consumer can also tear the connecting segment 141 away from the body 13 by lifting the tear corner 142 and tearing it along the tear line 2.

[0027] Referring to Figures 3, 9, and 10, in this first embodiment (Figure 3), the tear line 2 is separated by a first length L1 at its two opposite ends along the left-right direction X. However, in other variations, as shown in Figures 9 and 10, the tear line 2 can also be designed to be separated by a smaller (i.e., shorter) first length L1 along the left-right direction X, for example, D1:L1=1:0.3. Therefore, when the tear line 2 is broken, the drinking spout 10 is generally semi-circular.

[0028] By shortening the distance the tear line 2 extends along the left-right direction X, the length of the drinking opening 10 extending along the left-right direction X is reduced, further preventing the beverage from leaking from the corners of the mouth and the gaps at both ends of the drinking opening 10 when the consumer drinks. The tear line 2 can also be configured in other shapes, such as, but not limited to, triangles or rectangles, so that the drinking opening is triangular or rectangular, without limitation.

[0029] Referring to Figure 11, a second embodiment of the breathable paper cover of the present invention is shown, which is similar to the first embodiment, also including the top wall 1, the tear line 2, the adhesive film 3, and the waterproof and breathable component 4. The difference is that:

[0030] The second embodiment further includes a cut edge 5 formed on the adhesive film 3. The cut edge 5 divides the adhesive film 3 into a front adhesive layer 31 and a rear adhesive layer 32. The front adhesive layer 31 is attached to the bottom side of the extension sheet 14, and the rear adhesive layer 32 is attached to the bottom side of the body 13. The tear line 2 is configured as a discontinuous cutting line, and the cut edge 5 is also configured as a discontinuous cutting line, and has several spaced cuts 51. When the adhesive film 3 is attached to the inner surface 12 of the top wall 1, the cuts 51 are staggered with the cuts 21 of the tear line 2 along the vertical direction Z, and each cut 51 is located between two adjacent cuts 21 on the left and right.

[0031] In operation, when the consumer tears the left tear corner 142 to the right along the left-right direction X from the body 13, the extension piece 14 and the front adhesive layer 31 can be torn from the body 13 and the rear adhesive layer 32 in sequence from left to right, following one of the cuts 21 located on the far left, one of the cuts 51 arranged at the right end of one of the cuts 21, and another cut 21 arranged at the right end of one of the cuts 51.

[0032] Thus, through the special structural design of the tear line 2 and the cuts 21 and the cut edges 5 intersecting each other in the left-right direction X, the front adhesive layer 31 attached to the bottom side of the extension piece 14 can be prevented from tearing off the back adhesive layer 32 attached to the bottom side of the body 13 together, and the inner surface 12 of the top wall 1 (the bottom side of the body 13) and the back adhesive layer 32 of the adhesive film 3 can be prevented from being torn off together and breaking.

[0033] Referring to Figure 12, a third embodiment of the breathable paper cover of the present invention is shown, which is similar to the second embodiment, also including the top wall 1, the tear line 2, the adhesive film 3, the waterproof and breathable component 4, and the cut edge 5. The difference is that:

[0034] The cut edge 5 is formed on the adhesive film 3 and aligned with the tear line 2 along the vertical direction Z, dividing the adhesive film 3 into the front adhesive layer 31 and the rear adhesive layer 32. The tear line 2 is configured as either a half-cut slit or a dent obtained from the half-cutting process. The cut edge 5 is configured as a continuous cutting line. The aforementioned half-cutting process refers to cutting a portion of the thickness of the cardboard (i.e., the top wall 1 of this third embodiment) without completely cutting through it, so that the cardboard forms a dented and bendable structure.

[0035] In operation, when the consumer tears the left tear corner 142 to the right along the left-right direction X from the body 13, the extension piece 14 and the front adhesive layer 31 can be torn off together with the back adhesive layer 32 along the tear line 2 and the cut edge 5 aligned with the tear line 2 along the up-down direction Z.

[0036] In this way, by cutting the edge 5, the adhesive film 3 is divided into the front adhesive layer 31 and the rear adhesive layer 32. This also prevents the front adhesive layer 31, which is attached to the bottom side of the extension piece 14, from tearing off the rear adhesive layer 32, which is attached to the bottom side of the body 13. This also prevents the inner surface 12 of the top wall 1 (the bottom side of the body 13) and the rear adhesive layer 32 of the adhesive film 3 from being torn off together and breaking.

[0037] It is worth mentioning that in this third embodiment, the tear line 2 can also be configured as a discontinuous cutting line (see Figure 11), and is not limited thereto.

[0038] Referring to Figure 13, a fourth embodiment of the breathable paper cover of the present invention is shown, which is similar to the third embodiment, also including the top wall 1, the tear line 2, the adhesive film 3, the waterproof and breathable component 4, and the cut edge 5. The difference is that:

[0039] The cut edge 5 is adjacent to the tear line 2 along the front-back direction Y and spaced apart from the tear line 2, and is not aligned with the tear line 2 along the up-down direction Z. The cut edge 5 divides the adhesive film 3 into the front adhesive layer 31 and the rear adhesive layer 32. The front adhesive layer 31 is attached to the bottom side of the extension sheet 14 and a part of the body 13 (adjacent to the front end 135), and the rear adhesive layer 32 is attached to the bottom side of the remaining part of the body 13.

[0040] Unlike the third embodiment, in this fourth embodiment, the cut edge 5 is spaced apart from the tear line 2 along the front-back direction Y (i.e., the cut edge 5 is located behind the tear line 2). In other words, when the consumer tears the extension piece 14 along the tear line 2, only the front adhesive layer 31 will be torn off together, and the rear adhesive layer 32 will not be torn off and broken.

[0041] Therefore, this fourth embodiment can also prevent the front adhesive layer 31, which is attached to the bottom side of the extension piece 14 and a part of the body 13, from being torn off along with the rear adhesive layer 32, which is attached to the bottom side of the remaining part of the body 13, and can prevent the inner surface 12 of the top wall 1 (the bottom side of the body 13) and the rear adhesive layer 32 of the adhesive film 3 from being torn off and cracked.

[0042] It should be noted that in other variations, the tear line 2 of the third embodiment and the fourth embodiment can also be configured as the aforementioned discontinuous cutting line, and is not limited thereto.

[0043] Based on the above description, the advantages of the aforementioned embodiments can be summarized as follows:

[0044] 1. The space 90 is connected to the outside through the vents 131, and the waterproof and breathable component 4 is designed to allow the space 90 to breathe or dissipate heat. This allows heat inside the space 90 to escape to the outside through the vents 131, achieving the effect of ventilation and preventing heat buildup inside the space 90 from causing burns, thus ensuring high safety. Furthermore, compared to omitting the waterproof and breathable component 4 and directly opening the vents 131 on the top wall 1, the waterproof and breathable component 4 can also prevent beverage leakage from the space 90.

[0045] 2. The top wall 1 is made of paper material, which is more environmentally friendly than the existing plastic cap.

[0046] 3. When the consumer wants to drink, he / she only needs to lift the tear corner 142 to tear the extension piece 14 away from the body 13 along the tear line 2, so as to open the drinking mouth 10 and drink directly from the mouth.

[0047] 4. In addition, consumers can also insert straws into the slot 133, so the present invention can also be applied to non-sipped drinking methods.

[0048] 5. When the merchant places the cup body 9 into the setting port 60 of the sealing machine 6, the positioning protrusions 61 of the sealing machine 6 can serve as positioning points for the notches 140, thereby achieving the function of positioning the top wall 1 in the sealing machine, which is highly practical.

[0049] 6. The cut edge 5 can prevent the front adhesive layer 31 attached to the bottom side of the extension piece 14 from tearing off the rear adhesive layer 32 attached to the bottom side of the body 13 together, and can prevent the inner surface 12 of the top wall 1 and the rear adhesive layer 32 of the adhesive film 3 from being torn off together and breaking.

[0050] However, the above description is only an embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the patent specification shall still fall within the scope of the patent of the present invention. [Simplified Explanation of the Diagram]

[0051] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: Figure 1 is an exploded perspective view illustrating a first embodiment of the breathable paper cover of the present invention that can be covered on a cup body; Figure 2 is an exploded perspective view of the first embodiment viewed from the bottom side to the top side; Figure 3 is a top view of the first embodiment; Figure 4 is a cross-sectional view taken along line IV-IV in Figure 3; Figure 5 is an exploded perspective view of the first embodiment; Figure 6 is a top view illustrating an extension piece of the top wall of the first embodiment torn off from a body; Figure 7 is a schematic diagram illustrating the first embodiment placed in a sealing machine in use; Figure 8 is a top view similar to Figure 3 illustrating a variation of the extension piece; Figure 9 is a top view similar to Figure 3 illustrating another variation of the first embodiment; Figure 10 is a top view similar to Figure 6 illustrating the extension piece of Figure 9 torn off from the body; Figure 11 is an exploded perspective view similar to Figure 5 illustrating a second embodiment of the breathable paper cover of the present invention. Figure 12 is an exploded perspective view similar to Figure 11, illustrating a third embodiment of the breathable paper cover of the present invention; and Figure 13 is an exploded perspective view similar to Figure 12, illustrating a fourth embodiment of the breathable paper cover of the present invention.

Claims

1. A breathable paper lid suitable for covering a cup body surrounding and defining a space, the breathable paper lid comprising: a top wall made of paper material and having an outer surface and an inner surface arranged oppositely in a vertical direction, the inner surface being adapted to face the space, the top wall including a body and an extension piece connecting the body, the body having at least one vent hole penetrating the outer surface and the inner surface and communicating the space with the outside, and an outer edge adapted to connect to the cup body, the outer edge having a front end, the extension piece having a connecting segment connecting to the front end, and at least one tear corner connecting to the connecting segment, the tear corner protruding from the front end of the body in a left-right direction intersecting the vertical direction; A tear line disconnectably connects the front end of the body to the connecting segment. The tear line is configured as a discontinuous cutting line with several spaced cuts. When the tear line breaks, the front end cooperates with the cup body to define a drinking opening that connects the space to the outside. When the tear line connects the front end and the connecting segment, the connecting segment closes the drinking opening. A waterproof and breathable component faces the inner surface of the top wall and covers the at least one vent. The waterproof and breathable component is located between the space and the body in the vertical direction and is used to allow the space to breathe or dissipate heat. An adhesive film is formed on the inner surface of the top wall and is adapted to face the space. At least one vent also penetrates the adhesive film in the vertical direction. The waterproof and breathable component is connected to the adhesive film on the side opposite to the space in the vertical direction. A cut edge is formed on the adhesive film, which divides the adhesive film into a front adhesive layer and a rear adhesive layer. The cut edge is configured as a discontinuous cutting line and has several spaced cuts. The cuts are staggered with the slits in the vertical direction, and each cut is located between two adjacent slits.

2. The breathable paper cover as described in claim 1, wherein, The extension piece has two tear angles, which are respectively connected to the two opposite ends of the connecting segment along the left-right direction.

3. The breathable paper cover as described in claim 1, wherein, The waterproof and breathable component is configured as any one of filter paper, waterproof and breathable paper, breathable cotton, waterproof and breathable fabric, or non-woven fabric.

4. The breathable paper cover as described in claim 1, wherein, The body also has several inter-contacting joints that define a slot at intervals, the slot being suitable for inserting a straw.

5. A breathable paper lid suitable for covering a cup body surrounding and defining a space, the breathable paper lid comprising: a top wall made of paper material and having an outer surface and an inner surface arranged oppositely in a vertical direction, the inner surface being adapted to face the space; the top wall including a body and an extension piece connecting the body; the body having at least one vent hole penetrating the outer surface and the inner surface and communicating the space with the outside, and an outer edge adapted to connect to the cup body, the outer edge having a front end; the extension piece having a connecting segment connecting to the front end, and at least one tear corner connecting the connecting segment, the tear corner protruding from the front end of the body in a left-right direction intersecting the vertical direction; a tear line disconnectably connecting the front end of the body and the connecting segment; when the tear line is broken, the front end cooperates with the cup body to define a drinking opening communicating with the space and the outside; when the tear line connects the front end and the connecting segment, the connecting segment closes the drinking opening. A waterproof and breathable component facing the inner surface of the top wall and covering the at least one vent hole, the waterproof and breathable component being located between the space and the body in the vertical direction and used to allow the space to breathe or dissipate heat; an adhesive film formed on the inner surface of the top wall and adapted to face the space, the at least one vent hole also penetrating the adhesive film in the vertical direction, the waterproof and breathable component being connected to the adhesive film on the side opposite to the space in the vertical direction; and a cut edge formed on the adhesive film and aligned with the tear line in the vertical direction, the cut edge dividing the adhesive film into a front adhesive layer and a rear adhesive layer, the tear line being configured as either a half-cut mark or a groove obtained from a half-cutting process.

6. A breathable paper lid suitable for covering a cup body surrounding and defining a space, the breathable paper lid comprising: a top wall made of paper material and having an outer surface and an inner surface arranged oppositely in a vertical direction, the inner surface being adapted to face the space; the top wall including a body and an extension piece connecting the body; the body having at least one vent hole penetrating the outer surface and the inner surface and communicating the space with the outside, and an outer edge adapted to connect to the cup body; the outer edge having a front end; the extension piece having a connecting segment connecting to the front end and at least one tear corner connecting the connecting segment; the tear corner protruding from the front end of the body in a left-right direction intersecting the vertical direction; a tear line disconnectably connecting the front end of the body and the connecting segment; when the tear line is broken, the front end cooperates with the cup body to define a drinking opening communicating with the space and the outside; when the tear line connects the front end and the connecting segment, the connecting segment closes the drinking opening. A waterproof and breathable component facing the inner surface of the top wall and covering the at least one vent hole, the waterproof and breathable component being located between the space and the body in the vertical direction and used to allow the space to breathe or dissipate heat; an adhesive film formed on the inner surface of the top wall and adapted to face the space, the at least one vent hole also penetrating the adhesive film in the vertical direction, the waterproof and breathable component being connected to the adhesive film on the side opposite to the space in the vertical direction; and a cut edge formed on the adhesive film and adjacent to the tear line, the cut edge dividing the adhesive film into a front adhesive layer and a rear adhesive layer, the tear line being configured as any one of a discontinuous cutting line, a half-cutting mark obtained from a half-cutting process, or a groove.

7. The breathable paper cover as claimed in claim 1, wherein, The at least one tear corner of the top wall mates with the outer edge to define a notch.

8. The breathable paper cover as claimed in claim 1, wherein, The extension piece is spaced apart by a distance (D1) at its two opposite ends along the left-right direction, and the tear line is spaced apart by a first length (L1) at its two opposite ends along the left-right direction, with the ratio of D1:L1 being between 1:0.8 and 1:0.3.

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