Stackable paper cover with PHA (Polyhydroxyalkanoate) laminated film

Abstract

The utility model discloses a PHA drenched stackable paper cover, which comprises a stackable paper cover body and a reinforcing edge strip arranged at the edge of the bottom end of the stackable paper cover body, the stackable paper cover body is composed of a sleeving ring and a stacking top cover, the stacking top cover is located at the top end of the sleeving ring, and the reinforcing edge strip is arranged at the edge of the bottom end of the stacking top cover. The multiple stacked top covers can be stacked up and down layer by layer, the reinforcing edge strips are fixed to the outer wall of the edge of the bottom pad of the sleeving ring, the paper base layer is a base layer and an outer layer of the stackable paper cover body, a paper cover reinforcing and shaping device is additionally arranged on the outer wall of the PHA spraying film stackable paper cover, and the strip-shaped reinforcing patches are made of polylactic acid fibers and resin in a composite mode. The paper cover is attached to the stacking top cover and the sleeving ring in a hot-pressing mode, compression resistance is enhanced, pressure is dispersed, the paper cover is helped to be recovered after deformation, the service life is prolonged, when the paper cover serves as a beverage cup cover, heat dissipation and impurity prevention can be achieved through the design of the air holes, the blocking pieces and the sealing plugs, and the strip-shaped reinforcing patch materials are biodegradable and good in environment friendliness.

Description

Technical Field

[0001] This utility model belongs to the field of packaging-related technical technology, specifically relating to a stackable paper cap with PHA coating. Background Technology

[0002] In today's packaging industry, stackable paper lids are widely used in food, beverage, and other packaging components. Their performance directly affects the storage, transportation, and use of products. Traditional stackable paper lids have a relatively simple structural design, relying solely on the strength of the paper base to withstand the pressure generated during stacking. However, when multiple paper lids are stacked, the pressure on the bottom lid increases dramatically with the number of stacks, often leading to deformation, especially of the top lid and the connecting ring. This deformation not only affects the appearance of the paper lid, making it difficult to stack neatly, but may also compromise the lid's seal, reducing its protective function for the contents.

[0003] Regarding material selection, although some paper lids employ a waterproof and oil-proof inner layer, this design primarily focuses on preventing liquid penetration and has limited effect on improving the overall compressive strength of the paper lid. The paper base material itself has insufficient compressive strength and is prone to permanent deformation under long-term or significant pressure, making it unable to return to its original shape and thus affecting the reusability of the paper lid. Utility Model Content

[0004] The purpose of this invention is to provide a PHA-coated stackable paper cover to solve the problems mentioned in the background art. The traditional stackable paper cover has a simple structural design, relies on the strength of the paper base layer to bear the stacking pressure, and the pressure on the bottom paper cover increases dramatically when the number of stacks increases. The stacked top cover and the connecting ring are easily deformed, affecting the appearance, stacking neatness and sealing. In terms of material selection, the waterproof and oil-proof inner layer focuses on liquid protection and has limited effect on improving the pressure resistance. The paper base layer has insufficient pressure resistance and is prone to permanent deformation under long-term or heavy pressure, affecting the reusability.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stackable paper cover with PHA coating, comprising a stackable paper cover body and a reinforcing strip disposed at the bottom edge of the stackable paper cover body. The stackable paper cover body is composed of two main parts: a connecting ring and a stackable top cover. The stackable top cover is located at the top of the connecting ring, and multiple stackable top covers can be stacked one on top of the other. The reinforcing strip is fixed to the outer wall of the bottom edge of the connecting ring. The stackable paper cover body includes a waterproof and oil-proof inner layer and a paper base layer. The paper base layer is the base layer and outer layer of the stackable paper cover body. The inner wall of the paper base layer is provided with a waterproof and oil-proof inner layer. The outer wall of the stackable paper cover body is provided with a paper cover reinforcing and shaping device, and the outer walls of both the paper base layer and the paper cover reinforcing and shaping device are coated with PHA coating.

[0006] Preferably, the paper cover reinforcing and shaping device includes strip-shaped reinforcing patches and sealing discs. The sealing discs are attached to the outer wall of the top of the stackable paper cover body. Multiple strip-shaped reinforcing patches are equidistantly arranged on the circular outer wall of the sealing disc. The strip-shaped reinforcing patches are respectively attached to the stacking top cover and the sleeve ring of the stackable paper cover body. The multiple strip-shaped reinforcing patches are fixed to the outer wall of the paper base layer by hot pressing. After the strip-shaped reinforcing patches and the paper base layer are hot-pressed together, the strip-shaped reinforcing patches, the paper base layer and the outer wall of the sealing disc are all coated with PHA film.

[0007] Preferably, the sealing disc is not fixed to the paper base layer, and the strip-shaped reinforcing patch is made of polylactic acid fiber and polylactic acid resin composite, and the tensile strength of the strip-shaped reinforcing patch is greater than that of the paper base layer and the waterproof and oil-proof inner layer.

[0008] Preferably, the paper cover reinforcing and shaping device further includes a vent hole, a baffle plate, and a sealing plug. A vent hole is provided inside the center of the top of the stackable top cover of the upper half of the stackable paper cover body. A sealing plug is inserted into the vent hole. The sealing plug is fixed to the bottom outer wall of the sealing disc. A baffle plate is attached and fixed to the bottom outer wall of the sealing plug.

[0009] Preferably, the length of the baffle is greater than the diameter of the vent hole, and the width of the baffle is less than the diameter of the vent hole. When the sealing disc pulls the sealing plug upward, it can drive the baffle to pass through the vent hole from bottom to top, and after the upward pulling stops, the baffle can block the top of the vent hole.

[0010] Preferably, the thickness of the waterproof and oil-proof inner layer is less than the thickness of the paper base layer, the waterproof and oil-proof inner layer is a food-grade polyethylene film, and the waterproof and oil-proof effect of the waterproof and oil-proof inner layer is better than that of the PHA coating.

[0011] Preferably, the reinforcing strip extends outward from the bottom edge of the paper base layer, and the edge of the reinforcing strip curls inward into a circle to increase the tensile strength of the reinforcing strip.

[0012] Compared with the prior art, this utility model provides a stackable paper cover with PHA coating, which has the following beneficial effects:

[0013] This invention adds a novel paper cover reinforcing and shaping device to the outer wall of the PHA-coated stackable paper cover. The strip-shaped reinforcing patch of this device increases the compressive strength of the stackable paper cover. The strip-shaped reinforcing patch is made of polylactic acid fiber and polylactic acid resin composite and has a tensile strength greater than that of the paper base layer and the waterproof and oil-proof inner layer. It is heat-pressed onto the stacking top cover and connecting ring of the stackable paper cover body. This not only enhances the tightness and stability of the connections between the various parts of the paper cover, making multiple paper covers more safe and reliable when stacked, but also effectively disperses external pressure, greatly improving the overall compressive strength of the stackable paper cover. The device's ability to quickly restore the paper base layer after the stackable paper caps are deformed by compression extends the lifespan of the paper caps. In terms of functional applications, when the stackable paper caps are used as beverage cup end caps, the ingenious design of the vent, baffle, and sealing plug allows hot air to escape through the vent by pulling the sealing plug upwards with the sealing disc, thus cooling the beverage. Simultaneously, the baffle prevents impurities from falling in, improving the user experience. From an environmental perspective, the strip-shaped reinforcing patch uses biodegradable materials, reducing negative environmental impact while ensuring device performance. Attached Figure Description

[0014] Figure 1 This is a front-view three-dimensional structural diagram of a stackable paper cover with PHA coating according to the present invention.

[0015] Figure 2 This is a cross-sectional perspective view of a stackable paper cover with PHA coating according to the present invention.

[0016] Figure 3 This is a three-dimensional disassembly diagram of the paper cover reinforcing and shaping device of this utility model.

[0017] Figure 4 This is a cross-sectional perspective view of the three-dimensional structure of the paper cover reinforcing and shaping device of this utility model.

[0018] In the diagram: 1. Reinforcing edge strip; 2. Stackable paper cover body; 3. Connecting ring; 4. Stackable top cover; 5. Paper cover reinforcing and shaping device; 6. Waterproof and oil-proof inner layer; 7. Paper base layer; 8. Strip-shaped reinforcing patch; 9. Ventilation hole; 10. Sealing disc; 11. Baffle; 12. Sealing plug. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] This utility model provides, for example Figure 1-4 The illustrated stackable paper cover with PHA coating includes a stackable paper cover body 2 and a reinforcing strip 1 disposed at the bottom edge of the stackable paper cover body 2. The stackable paper cover body 2 consists of two main parts: a connecting ring 3 and a stacking top cover 4. The stacking top cover 4 is located at the top of the connecting ring 3, and multiple stacking top covers 4 can be stacked one on top of the other. The reinforcing strip 1 is fixed to the outer wall of the bottom edge of the connecting ring 3. The stackable paper cover body 2 is composed of a connecting ring 3 and a stacking top cover 4. The stacking top cover 4 is located at the top of the connecting ring 3. This design allows multiple stacking top covers 4 to be stacked one on top of the other. The principle is that by utilizing the cooperation of the connecting ring 3 and the stacking top cover 4, when multiple paper covers are stacked, the connecting ring 3 of the upper paper cover can naturally fit onto the stacking top cover 4 of the lower paper cover, achieving a stable stacking effect, facilitating storage and transportation, and reducing space occupation. The stackable paper cover body 2 includes a waterproof and oil-proof inner layer 6 and a paper base. Layer 7, the paper base layer 7, serves as the base layer and outer layer of the stackable paper cover body 2. The inner wall of the paper base layer 7 is provided with a waterproof and oil-proof inner layer 6, and the outer wall of the stackable paper cover body 2 is provided with a paper cover reinforcing and shaping device 5. Both the outer walls of the paper base layer 7 and the outer walls of the paper cover reinforcing and shaping device 5 are coated with a PHA film. PHA is a biodegradable thermoplastic polyester with good biocompatibility and processing performance. The principle of coating with PHA film is that PHA can form a uniform and continuous film on the surface of the paper cover. This film can further improve the waterproof and moisture-proof performance of the paper cover by filling the tiny pores on the surface of the paper base layer 7 and reducing the possibility of moisture entering the interior of the paper cover. On the other hand, the biodegradable characteristics of PHA meet environmental protection requirements. After the paper cover is used, the PHA film can gradually decompose in the natural environment, reducing environmental pollution. It has obvious advantages over traditional non-degradable coatings.

[0021] like Figure 1 and Figure 2As shown, the thickness of the waterproof and oil-proof inner layer 6 is less than the thickness of the paper base layer 7. The waterproof and oil-proof inner layer 6 is a food-grade polyethylene film, and its waterproof and oil-proof effect is superior to that of the PHA coating. The paper base layer 7, as the base layer and outer layer of the stackable paper cap body 2, provides the basic shape and a certain strength. The waterproof and oil-proof inner layer 6 is set on the inner wall of the paper base layer 7. Food-grade polyethylene film is chosen because of its good waterproof and oil-proof effect. The principle is that the polyethylene molecular structure is compact, which can effectively block the penetration of water and oil, protect the paper base layer 7 from liquid corrosion, and extend the service life of the paper cap. At the same time, the food-grade material ensures safety when in contact with food, and the thickness of the waterproof and oil-proof inner layer 6 is less than that of the paper base layer 7. This design ensures both waterproof and oil-proof functionality, while preventing the inner layer from being too thick and affecting the overall flexibility and lightness of the paper cover. The reinforcing strip 1 extends outward from the bottom edge of the paper base layer 7, and the edge of the reinforcing strip 1 is rolled inward into a circle to increase the tensile strength of the reinforcing strip 1. The principle behind this design to increase the tensile strength of the reinforcing strip 1 is that the outward extension expands the support area, while the inward rolling and curling structure changes the force distribution. When subjected to external force, the circular structure can evenly distribute the force to the entire reinforcing strip 1, avoiding excessive local stress, thereby effectively enhancing the tensile and deformation resistance of the bottom edge of the paper cover and protecting the bottom edge of the paper cover from damage during use.

[0022] like Figure 1 , Figure 3 and Figure 4As shown, the paper cover reinforcing and shaping device 5 includes strip-shaped reinforcing patches 8 and sealing discs 10. The sealing discs 10 are attached to the outer wall of the top of the stackable paper cover body 2. Multiple strip-shaped reinforcing patches 8 are equidistantly arranged on the circular outer wall of the sealing discs 10. The strip-shaped reinforcing patches 8 are respectively attached to the stacking top cover 4 and the sleeve ring 3 of the stackable paper cover body 2. The multiple strip-shaped reinforcing patches 8 are fixed to the outer wall of the paper base layer 7 by hot pressing. The principle of hot pressing is to use high temperature and pressure to reduce the distance between the molecules on the surface of the strip-shaped reinforcing patches 8 and the paper base layer 7, increase the intermolecular interaction force, and thus achieve a firm bond. In this way, when the paper cover is subjected to external force, the strip-shaped reinforcing patches 8 can distribute the force to the entire surface of the paper cover, avoiding excessive local force that could lead to deformation or damage. After the strip-shaped reinforcing patches 8 and the paper base layer 7 are hot-pressed together, the strip-shaped reinforcing patches 8 and the paper base layer 7 form a solid bond. Both the outer walls of 7 and the sealing disc 10 need to be coated with PHA film. The sealing disc 10 is not fixed to the paper base layer 7. The strip-shaped reinforcing patch 8 is made of polylactic acid fiber and polylactic acid resin composite. The tensile strength of the strip-shaped reinforcing patch 8 is greater than that of the paper base layer 7 and the waterproof and oil-proof inner layer 6. The strip-shaped reinforcing patch 8 is made of polylactic acid fiber and polylactic acid resin composite. Both materials have good biodegradability and certain mechanical properties. Polylactic acid fiber has high strength and good flexibility, while polylactic acid resin has good formability and adhesion. Combining them to make strip-shaped reinforcing patch 8 can not only give full play to their respective advantages, so that the strip-shaped reinforcing patch 8 has a tensile strength greater than that of the paper base layer 7 and the waterproof and oil-proof inner layer 6, but also conforms to the concept of environmental protection. While ensuring the performance of the reinforced paper cover structure, it can gradually degrade in the natural environment after use, reducing the burden on the environment.

[0023] like Figure 1 , Figure 3 and Figure 4 As shown, the paper cover reinforcing and shaping device 5 also includes a vent hole 9, a baffle plate 11, and a sealing plug 12. A vent hole 9 is provided inside the center of the top of the stacking top cover 4 of the upper half of the stackable paper cover body 2. A sealing plug 12 is inserted into the vent hole 9. The sealing plug 12 is fixed to the bottom outer wall of the sealing disc 10. A baffle plate 11 is adhered and fixed to the bottom outer wall of the sealing plug 12. The length of the baffle plate 11 is greater than the diameter of the vent hole 9, and the width of the baffle plate 11 is less than the diameter of the vent hole 9. When the sealing disc 10 pulls the sealing plug 12 upwards, it can cause the baffle plate 11 to pass through the vent hole 9 from bottom to top. After the upward pulling stops, the baffle 11 can block the top of the vent hole 9. This design is mainly used to achieve heat dissipation. When the stackable paper lid is used in containers such as beverage cups, the heat generated by the beverage accumulates inside the container. Pulling the sealing plug 12 upward opens the vent hole 9, and the heat can be discharged through the vent hole 9, thereby reducing the temperature inside the container. After the sealing plug 12 is pulled out, the baffle 11 blocks the top of the vent hole 9, which can prevent external impurities from falling into the container and ensure the hygiene of the container. This ingenious structural design satisfies both heat dissipation needs and hygiene requirements.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stackable paper cover with PHA coating, comprising a stackable paper cover body (2) and a reinforcing strip (1) disposed at the bottom edge of the stackable paper cover body (2), the stackable paper cover body (2) being composed of two main parts: a connecting ring (3) and a stackable top cover (4), the stackable top cover (4) being located at the top of the connecting ring (3), and multiple stackable top covers (4) being stacked layer by layer, the reinforcing strip (1) being fixed to the outer wall at the bottom edge of the connecting ring (3), the stackable paper cover body (2) comprising a waterproof and oil-proof inner layer (6) and a paper base layer (7), the paper base layer (7) being the base layer and outer layer of the stackable paper cover body (2), the inner wall of the paper base layer (7) being provided with a waterproof and oil-proof inner layer (6), characterized in that: The outer wall of the stackable paper cover body (2) is provided with a paper cover reinforcing and shaping device (5), and both the paper base layer (7) and the outer wall of the paper cover reinforcing and shaping device (5) are coated with PHA film; The paper cover reinforcing and shaping device (5) includes strip reinforcing patches (8) and sealing discs (10). The sealing discs (10) are attached to the top outer wall of the stackable paper cover body (2). Multiple strip reinforcing patches (8) are equidistantly arranged on the circular outer wall of the sealing discs (10). The strip reinforcing patches (8) are respectively attached to the stacking top cover (4) and the sleeve ring (3) of the stackable paper cover body (2). The multiple strip reinforcing patches (8) are fixed to the outer wall of the paper base layer (7) by hot pressing. After the strip reinforcing patches (8) and the paper base layer (7) are hot-pressed together, the strip reinforcing patches (8), the paper base layer (7) and the outer wall of the sealing discs (10) are all coated with PHA film.

2. The stackable paper cap with PHA coating according to claim 1, characterized in that: The sealing disc (10) is not fixed to the paper base layer (7), and the tensile strength of the strip-shaped reinforcing patch (8) is greater than that of the paper base layer (7) and the waterproof and oil-proof inner layer (6).

3. The stackable paper cover with PHA coating according to claim 2, characterized in that: The paper cover reinforcing and shaping device (5) also includes a vent hole (9), a baffle (11) and a sealing plug (12). The upper half of the stackable paper cover body (2) has a vent hole (9) inside the center of the top of the stacking top cover (4). A sealing plug (12) is inserted into the vent hole (9). The sealing plug (12) is fixed to the bottom outer wall of the sealing disc (10). A baffle (11) is pasted and fixed to the bottom outer wall of the sealing plug (12).

4. The stackable paper cover with PHA coating according to claim 3, characterized in that: The length of the baffle (11) is greater than the diameter of the vent (9), and the width of the baffle (11) is less than the diameter of the vent (9). When the sealing disc (10) pulls the sealing plug (12) upward, the baffle (11) can be driven to pass through the vent (9) from bottom to top. After the upward pulling stops, the baffle (11) can block the top of the vent (9).

5. A stackable paper cap with PHA coating according to claim 1, characterized in that: The thickness of the waterproof and oil-proof inner layer (6) is less than that of the paper base layer (7). The waterproof and oil-proof inner layer (6) is a food-grade polyethylene film, and the waterproof and oil-proof inner layer (6) has a better waterproof and oil-proof effect than the PHA coating.

6. The stackable paper cap with PHA coating according to claim 1, characterized in that: The reinforcing strip (1) is formed by extending outward from the bottom edge of the paper base layer (7), and the edge of the reinforcing strip (1) is rolled inward into a circle to increase the tensile strength of the reinforcing strip (1).

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