Special coating plate roller for convenient food cover material and cover material

Abstract

The utility model relates to the technical field of packaging engineering, and provides a special coating plate roller for a convenient food cover material and the cover material, which comprises a roller body, a coating area is arranged on the roller body, a plurality of first holes are formed in the coating area, the first holes are used for processing water filtering holes after extrusion compounding or gluing of a coating glue layer, and the coating area is further provided with a plurality of second holes. The second holes are used for adhering the sub-cover and the base layer at the second holes after extrusion compounding, so that intermittent adhesion is realized. By means of the technical scheme, the problems that in the prior art, a direct cloth coating printing technology is adopted, and it is difficult to meet the requirement for arrangement of a draining opening during printing; the draining opening is easy to tear due to the coating arrangement of the release oil, but the strength of the cover material is sacrificed.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging engineering, and in particular to a special coating roller for instant food cover materials and the cover material. Background Art

[0002] The production and pattern design of the drain cover for mixed noodles mainly involve gravure printing technology, especially in the food packaging industry, where the design of the drain cover and pattern printing is a highly sophisticated process that requires both functionality and aesthetics. In the coating layout processing, the coating roller is the core component, and its task is to coat the layout with water or ink, ensure uniformity through the anilox design, and provide a smooth pretreatment layer for subsequent printing. The precision, hardness, and anilox design of the coating roller have a significant impact on the uniformity of water distribution. The existing direct coating printing technology can form a pattern, but it is difficult to meet the setting of the drain port at the same time, because the drain design requires special treatment. In order to facilitate the tearing of the cover, the tearing design, such as the coating of the release oil, is easy to tear off, but the strength of the cover material is sacrificed, resulting in easy damage near the tearing, affecting the user experience and product protection. Utility Model Content

[0003] The utility model provides a coating plate roller and a cover material specially used for a convenient food cover material, which solves the problem in the related art that it is difficult to simultaneously meet the requirements of setting a drain port by using direct coating material printing technology; the coating arrangement of release oil makes the drain port easy to tear open, but sacrifices the strength of the cover material.

[0004] The technical solution of the utility model is as follows:

[0005] A coating plate roller for instant food cover material, used for coating a release oil layer on a cover layer or a base layer, the release oil layer is used to maintain release when the cover layer and the base layer are compounded, the cover layer and the base layer are compounded into an instant food cover material, the instant food cover material is used to process an instant food cover, the cover layer of the instant food cover comprises a mother cover and a sub-cover arranged on the mother cover, the release oil layer is provided between the sub-cover and the base layer, comprising:

[0006] A roller body, wherein the roller body has a coating area, the coating area has a plurality of first holes, the first holes are used to process drainage holes after the cover layer and the base layer are compounded, and the coating area also has a plurality of second holes, the second holes are used to adhere the sub-cover and the base layer at the plurality of second holes after the cover layer and the base layer are compounded, thereby achieving intermittent adhesion.

[0007] As a further technical solution, the first hole is circular, elliptical or elongated.

[0008] As a further technical solution, the second holes are arranged in a ring-shaped area or in an array throughout the coating area, and the second holes are distributed around the first holes.

[0009] As a further technical solution, the second hole is circular, elliptical, a long hole or a polygonal shape.

[0010] As a further technical solution, the coating area further has an edge portion, and the edge portion is located at the edge of the sub-cover and outside the annular area.

[0011] Cover materials, including:

[0012] Grassroots,

[0013] A cover layer, wherein the cover layer is arranged on the base layer, and comprises a mother cover and a sub-cover arranged on the mother cover, wherein a release area is provided between the sub-cover and the base layer, wherein the release area has a plurality of first holes, wherein the first holes are used for processing water filtering holes, and the release area also has a plurality of second holes, wherein the second holes are used for bonding the sub-cover and the base layer at the plurality of second holes after the cover layer and the base layer are compounded, thereby achieving intermittent bonding.

[0014] As a further technical solution, the first hole is circular, elliptical or a long strip hole; the second hole is circular, elliptical, a long strip hole or a polygon; the second holes are arranged in an annular area or distributed in an array in the release area, and the second holes are distributed around the first hole.

[0015] As a further technical solution, the release area further has an edge portion, and the edge portion is located at the edge of the sub-cover and outside the annular area.

[0016] As a further technical solution, a first breaking line is provided between the sub-cover and the mother cover, and both the sub-cover and the mother cover are composited on the base layer.

[0017] As a further technical solution, there is a dividing line between the sub-cover and the mother cover, and the base layer has a plurality of annular dividing lines at positions corresponding to the first hole. The annular dividing lines divide the base layer into a plurality of water filtering holes and adhesive strips. The adhesive strips are compounded on the sub-cover, and the shapes of the water filtering holes and the adhesive strips are the same as that of the first hole.

[0018] The working principle and beneficial effects of the utility model are:

[0019] In the utility model, the cover is divided into a cover layer and a base layer. The base layer is a material in contact with a convenient food container, and a food-safe material is selected. A design of coating release oil on the cover layer or the base layer is adopted. At the same time, the design of the sub-cover and the mother cover realizes the setting of the drain port to realize the release, so that the cover layer and the base layer can be separated simply and smoothly by manpower at a specific position. The main structure includes a coating roller body, and a coating area is specially provided on the surface of the roller body. The area is used to coat the release oil, and the coating area is provided with two groups of holes: a first hole and a second hole. The first hole is used to process the position without release oil in the release oil layer corresponding to the position of the water filter hole, so that the sub-cover can be smoothly separated from the base layer at the position of the release oil. The position of the first hole on the roller body coincides with the position of the water filter hole. The setting of the first hole makes the position of the water filter hole not coated with release oil. After the release oil layer is covered on the base layer or the cover layer and the cover layer and the base layer are compounded, since the first hole and the position corresponding to the first hole are not coated with release oil, the cover layer and the base layer at the position corresponding to the first hole will adhere together. When the sub-cover part of the cover layer is torn off, the corresponding position of the first hole of the base layer will be torn off synchronously, achieving the effect of leaking out the drain port, ensuring the convenient opening of the drain port without damaging the overall structure. The convenience and practicality of the food cover are improved, the processing flow is simplified, and the production efficiency of the food packaging industry is optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0021] Figure 1 This is a schematic diagram of the layered structure of the instant food cover in the utility model;

[0022] Figure 2 for Figure 1 Middle A is a schematic diagram of a partially enlarged structure;

[0023] Figure 3 for Figure 1 Another perspective structural diagram;

[0024] Figure 4 This is a schematic diagram of the roller structure in the utility model;

[0025] Figure 5 for Figure 4 Middle B is a schematic diagram of a partially enlarged structure;

[0026] In the figure: cover layer -101, base layer -102, release oil layer -103, mother cover -104, sub cover -105, water filter hole -106, release area -107, first dividing line -108, annular dividing line -109, adhesive strip -110, roller body -2, coating area -201, first hole -202, second hole -203, edge part -204. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0028] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0029] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0030] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0031] Reference Figure 1~Figure 5 The embodiment of the utility model provides a coating roller for instant food cover material, which is used to coat a release oil layer 103 on a cover layer 101 or a base layer 102. The release oil layer 103 is used to maintain release when the cover layer 101 and the base layer 102 are compounded. The cover layer 101 and the base layer 102 are compounded into an instant food cover material. The instant food cover material is used to process an instant food cover. The cover layer 101 of the instant food cover has a mother cover 104 and a sub-cover 105 opened on the mother cover 104. The sub-cover 105 There is a release oil layer 103 between the cover layer 101 and the base layer 102, including a roller body 2, and a coating area 201 on the roller body 2. The coating area 201 has a plurality of first holes 202. The first holes 202 are used to process water filtering holes 106 after the cover layer 101 and the base layer 102 are compounded. The coating area 201 also has a plurality of second holes 203. The second holes 203 are used to adhere the sub-cover 105 to the base layer 102 at a plurality of second holes 203 after the cover layer 101 and the base layer 102 are compounded, thereby achieving intermittent adhesion.

[0032] In this embodiment, considering that the prior art uses direct coating material printing technology, it is difficult to simultaneously meet the requirements of the setting of the drain port; this solution divides the cover into a cover layer 101 and a base layer 102. The base layer 102 is a material that comes into contact with a convenient food container, and a food-safe material is selected. A design of coating release oil on the cover layer 101 or the base layer 102 is adopted. At the same time, the setting of the drain port is realized through the design of the sub-cover 105 and the mother cover 104 to achieve release, so that the cover layer 101 and the base layer 102 can be separated simply and smoothly by manpower at a specific position. The main structure includes a coating roller body 2, and a coating area 201 is specially provided on the surface of the roller body 2. The area is used to apply release oil, and the coating area 201 is provided with two groups of holes: a first hole 202 and a second hole 203. The first hole 202 is used to process a position without release oil in the release oil layer 103 corresponding to the position of the water filter hole 106, so that the sub-cover 105 can be smoothly separated from the base layer 102 at the position of the release oil. The position of the first hole 202 on the roller body 2 coincides with the position of the water filter hole 106. The setting of the first hole 202 makes it possible for the position of the water filter hole 106 to be free of release oil. After the release oil layer 103 is covered on the base layer 102 or the cover layer 101 and the base layer 102 and the cover layer 101 are compounded, due to the first hole 202 and the first hole 2 02 corresponding position is not coated with release oil, the position coated with release oil will form a relatively separated and difficult to fall off part under the action of release oil, the area not coated with release oil will be squeezed out of the resin or adhesive compound, the cover layer 101 and the base layer 102 corresponding position of the first hole 202 will be adhered together, when the sub-cover 105 part of the cover layer 101 is torn off, it will be torn off with the corresponding position of the first hole 202 of the base layer 102, achieving the effect of leaking out the drain port, ensuring the convenient opening of the drain port without damaging the overall structure. The convenience and practicality of the food cover are improved, the processing flow is simplified, and the production efficiency of the food packaging industry is optimized.

[0033] At the same time, considering the arrangement of the release oil coating, the drain port is easy to tear, but the strength of the cover material is sacrificed. In this solution, a second hole 203 is arranged on the roller body 2. The second hole 203 is arranged in a plurality of ways. The second hole 203 has the same effect on the release oil as the first hole 202. The position corresponding to the second hole 203 is a composite layer without a release oil layer 103, which can make the sub-cover 105 and the base layer 102 intermittently adhere at the second hole 203. The specific effect is that multiple connection points enhance the strength of the cover material around the drain port. At the same time, the intermittent design can also make the sub-cover 105 easier to tear off from the base layer 102. The intermittent adhesion effect also avoids the occurrence of accidental tearing. For the user, the process of tearing off the sub-cover 105 can be smoother and more controllable, and the strength of the tearing is enhanced, thereby further enhancing the overall strength of the cover material.

[0034] Furthermore, the first hole 202 is circular, elliptical or elongated.

[0035] In this embodiment, the hole shape of the first hole 202 is optimized, and the first hole 202 of the coating area 201 is designed to be circular or elliptical / elongated. The circular hole design ensures the uniformity of coating and reduces dripping. The elliptical hole and the elongated coating path are conducive to continuous coverage, which is suitable for the specific distribution of the release oil layer 103 or the composite layer, ensures the precise positioning of the drain port, and improves production flexibility. In addition, the shape of the water filter hole 106 on the base layer 102 is limited. This solution not only improves the uniformity of the cloth layer by optimizing the shape of the first hole 202 and designing it into a circular or elliptical / elongated shape, but also adapts to different process requirements, especially the drainage design, improves the production efficiency of the food cover material and the functionality of the final product, and meets the market's diverse needs for food packaging.

[0036] Furthermore, the second holes 203 are arranged in a ring-shaped area or in an array throughout the coating area 201 , and the second holes 203 are distributed around the first holes 202 .

[0037] In this embodiment, the hole arrangement design of the coating roller for instant food cover material is optimized to further improve the coating efficiency and uniformity of the coating layer. The specific features are the annular or array layout of the second hole 203 and the coordinated distribution with the first hole 202. Specifically, the second hole 203 of the coating area 201 adopts an annular arrangement or array design, and the annular arrangement surrounds the coating area 201, or coats the coating area 201 except the first hole 202. When the second hole 203 is arranged in an annular manner, the continuity of the coating can be increased, and the uniform distribution of the composite layer can be ensured, and finally a state of annular intermittent adhesion is formed between the sub-cover 105 and the base layer 102, which is conducive to tearing off the sub-cover 105 to leak out of the drain outlet, and the strength of the cover material at the drain outlet is also guaranteed. The first hole 202 and the second hole 203 are distributed around to form an effective synergy, which ensures the precise positioning of the drain outlet and the composite layer, avoids the problem of uneven distribution, and improves the overall aesthetic and practical effects. The array is filled in a predetermined pattern to achieve precise control and adapt to the thickness of the extrusion layer or glue layer in a specific area, so that the strength of the cover material at the drain port is more stable. The circular or array arrangement of the second holes 203 and the coordinated layout with the first holes 202 not only improve the uniformity of coating, but also achieve precise positioning of the drain design, improve the production efficiency of food cover materials and the quality of finished products, and meet the high standards of modern packaging.

[0038] Furthermore, the second hole 203 is circular, elliptical, elongated or polygonal.

[0039] In this embodiment, the second hole 203 is designed in a circular, elliptical, long strip or polygonal shape, which greatly enhances the flexibility and adaptability of coating, meets the requirements of drainage design from basic to complex, improves the beauty and functionality of food cover materials, and adapts to the diversification trend of the modern packaging market. The diversified hole design makes the coating process more flexible, not only meets the basic uniform coating requirements, but also can be designed for special drainage, complex patterns or enhanced structures, thereby enhancing the personalization and functionality of food cover materials.

[0040] Furthermore, the coating area 201 also has an edge portion 204 , and the edge portion 204 is located at the edge of the sub-cover 105 and outside the annular area.

[0041] In this embodiment, the coating area 201 is specially provided with an edge portion 204, which is located at the edge of the food cover, ensuring the uniform distribution of the entire edge of the cover material, especially the continuity of the edge of the cover, and preventing problems such as uneven distribution and falling off at the edge. The design of the edge portion 204 makes the coating contour of the release oil located outside the outer contour of the sub-cover 105, which can prevent the edge of the sub-cover 105 from being unable to be effectively and evenly coated with the release oil, thereby causing the sub-cover 105 to be difficult to tear off smoothly from the base layer 102, making the product more stable in use. The coating process of the edge of the food cover material is optimized, which not only improves the quality of the edge of the sub-cover 105, but also enhances the stable aesthetics and improves the market competitiveness of the product.

[0042] The cover material includes a base layer 102, a cover layer 101 is arranged on the base layer 102, and has a mother cover 104 and a sub-cover 105 arranged on the mother cover 104. A release area 107 is provided between the sub-cover 105 and the base layer 102. The release area 107 has a plurality of first holes 202. The first holes 202 are used to process the water filtering holes 106. The release area 107 also has a plurality of second holes 203. The second holes 203 are used to adhere the sub-cover 105 to the base layer 102 at the plurality of second holes 203 after the cover layer 101 is compounded with the base layer 102, so as to achieve intermittent adhesion.

[0043] In this embodiment, the design of the cover material includes a base layer 102, which serves as the inner layer in contact with the food and the location where the water filter hole 106 is set, and is covered with a cover layer 101. The cover layer 101 not only includes a mother cover 104, but also a sub-cover 105 cleverly designed on the mother cover 104, which is separated from the base layer 102 by a release area 107, ensuring the convenience of opening and closing and draining. The release area 107 is provided with a first hole 202, which is specially designed to process the water filter hole 106, improve the drainage function, and make eating more convenient. At the same time, the release oil layer 103 ensures that the sub-cover 105 is easily separated from the base layer 102, making it easy to open the water filter hole 106. The second hole 203 of the release area 107 is used to bond the sub-cover 105 to the base layer 102 at a specific second hole 203 position after extruding a composite or coating an adhesive layer, thereby forming an intermittent adhesion, thereby strengthening the strength of the overall structure and ensuring the easy-tear performance of the drainage part. The overall design simplifies the opening operation of the food cover and facilitates drainage, while maintaining the strong inherent structure of the cover and improving the user experience.

[0044] Furthermore, the first hole 202 is circular, elliptical or a long strip hole; the second hole 203 is circular, elliptical, a long strip hole or a polygon; the second holes 203 are arranged in an annular area or distributed in an array in the release area 107, and the second holes 203 are distributed around the first hole 202.

[0045] In this embodiment, the first hole 202 is designed to be circular or elliptical / elongated. The circular hole ensures the uniformity of water filtration, while the elliptical or elongated hole is adapted to specific drainage design to meet diverse needs. The second hole 203 includes circular, elliptical, elongated or polygonal shapes. The circular and elliptical holes provide uniform coating, the elongated shape adapts to special cloth paths, and the polygonal shape enhances the flexibility of patterned design. The arrangement of the second holes 203 is optimized to be a ring or array. The ring layout surrounds the release area 107 to ensure continuity and beauty; the array layout accurately controls the coating to meet complex design requirements. The second holes 203 are distributed around the first hole 202, ensuring the precise positioning of drainage and compounding and improving the overall coordination.

[0046] Furthermore, the release area 107 also has an edge portion 204 , and the edge portion 204 is located at the edge of the sub-cover 105 and outside the annular area.

[0047] In this embodiment, the release area 107 is additionally provided with an edge portion 204, and the edge portion 204 is located at the edge of the sub-cover 105. This design is intended to strengthen the edge processing, improve the firmness and aesthetics of the edge, and avoid uneven edges. The edge portion 204 is arranged outside the annular area to prevent the edge of the sub-cover 105 from being unable to be effectively and evenly coated with release oil, thereby causing the sub-cover 105 to be difficult to tear off smoothly from the base layer 102. At the same time, such a layout design ensures a natural transition between the edge portion 204 and the main structure, improves the overall coordination, and makes the edge processing less abrupt and more aesthetically pleasing.

[0048] Furthermore, a first breaking line 108 is formed between the sub-cover 105 and the main cover 104 , and both the sub-cover 105 and the main cover 104 are composited on the base layer 102 .

[0049] In this embodiment, a clear first breaking line 108 is provided between the sub-cover 105 and the mother cover 104. This design optimization ensures the separation process of the sub-cover 105 and the mother cover 104, so that when the user opens the sub-cover 105, it is easy to separate along the breaking line without effort, which simplifies the operation and improves the user experience. It improves the convenience of use. Despite the separation design of the sub-cover 105 and the mother cover 104, the composite on the base layer 102 maintains overall stability. Through the release design, the tightness during drainage and composite is guaranteed without affecting the overall structural stability.

[0050] Furthermore, there is a dividing line between the sub-cover 105 and the main cover 104, and the base layer 102 has a plurality of annular dividing lines 109 at positions corresponding to the first hole 202. The annular dividing lines 109 divide the base layer 102 into a plurality of water filtering holes 106 and adhesive strips 110. The adhesive strips 110 are compounded on the sub-cover 105, and the shapes of the water filtering holes 106 and the adhesive strips 110 are the same as the shapes of the first hole 202.

[0051] In this embodiment, the base layer 102 corresponds to the first hole 202, and the annular dividing line divides the base layer 102 to create a water filter hole 106 and an adhesive strip. The water filter hole 106 and the adhesive strip 110 formed by the annular dividing line match the shape of the first hole 202, ensuring accurate drainage and convenient bonding. The adhesive strip 110 is compounded on the sub-cover 105 to ensure the stability of the water filter hole 106 and the bonding. The design of the water filter hole 106 and the adhesive strip 110 not only optimizes the drainage performance, but also strengthens the bonding between the sub-cover 105 and the base layer 102, making the overall structure more stable, improving the user experience, and giving equal importance to beauty and functionality.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A coating roller specially used for instant food cover material, characterized in that: The invention is used for coating a release oil layer (103) on a cover layer (101) or a base layer (102), the release oil layer (103) being used to maintain release when the cover layer (101) and the base layer (102) are compounded, the cover layer (101) and the base layer (102) are compounded to form a convenient food cover material, the convenient food cover material is used to process a convenient food cover, the cover layer (101) of the convenient food cover comprises a mother cover (104) and a sub-cover (105) opened on the mother cover (104), the release oil layer (103) is provided between the sub-cover (105) and the base layer (102), and comprises a roller body (2), the roller body (2) having a coating area (201), the coating area (201) having a plurality of first holes (202), the first holes (202) being used to process water filtering holes (106) after the cover layer (101) and the base layer (102) are compounded.

2. The coating roller for instant food cover material according to claim 1, characterized in that: The coating area (201) also has a plurality of second holes (203), and the second holes (203) are used to adhere the sub-cover (105) and the base layer (102) at the plurality of second holes (203) after the cover layer (101) and the base layer (102) are compounded, thereby achieving intermittent adhesion, and the first hole (202) is a circular, oval or elongated hole type.

3. The coating roller for instant food cover material according to claim 2, characterized in that: The second holes (203) are arranged in a ring-shaped area or in an array throughout the coating area (201), and the second holes (203) are distributed around the first holes (202).

4. The coating roller for instant food cover material according to claim 2, characterized in that: The second hole (203) is circular, elliptical, a long hole or a polygonal shape.

5. The coating roller for instant food cover material according to claim 3, characterized in that: The coating area (201) further has an edge portion (204), and the edge portion (204) is located at the edge of the sub-cover (105) and outside the annular area.

6. A cover material, characterized in that: include: Grassroots (102), A cover layer (101), wherein the cover layer (101) is arranged on the base layer (102), and comprises a mother cover (104) and a sub-cover (105) arranged on the mother cover (104), wherein a release area (107) is provided between the sub-cover (105) and the base layer (102), wherein the release area (107) has a plurality of first holes (202), and wherein the first holes (202) are used to process water filter holes (106).

7. The cover material according to claim 6, characterized in that: The first hole (202) is circular, elliptical or a long strip hole type; the release area (107) also has a plurality of second holes (203), and the second holes (203) are used to adhere the sub-cover (105) and the base layer (102) at a plurality of second holes (203) after the cover layer (101) and the base layer (102) are compounded, so as to achieve intermittent adhesion, and the second holes (203) are circular, elliptical, a long strip hole type or a polygonal shape; the second holes (203) are arranged in a ring area or in an array in the release area (107), and the second holes (203) are distributed around the first holes (202).

8. The cover material according to claim 6, characterized in that: The release area (107) further comprises an edge portion (204), wherein the edge portion (204) is located at the edge of the sub-cover (105) and outside the annular area.

9. The cover material according to claim 6, characterized in that: A first breaking line (108) is provided between the sub-cover (105) and the main cover (104), and both the sub-cover (105) and the main cover (104) are composited on the base layer (102).

10. The cover material according to claim 6, characterized in that: There is a dividing line between the sub-cover (105) and the main cover (104), and the base layer (102) has a plurality of annular dividing lines (109) at positions corresponding to the first hole (202), the annular dividing lines (109) dividing the base layer (102) into a plurality of water filtering holes (106) and adhesive strips (110), the adhesive strips (110) being composited on the sub-cover (105), the shapes of the water filtering holes (106) and the adhesive strips (110) being the same as the shape of the first hole (202).

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