A peelable and recyclable package and bag

Abstract

The utility model discloses a kind of packaging and packaging bag of peelable recycling, the packaging includes printing substrate layer, peeling layer and heat-sealing layer in turn from outside to inside distribution;The binding force between peeling layer and printing substrate layer is greater than the binding force between peeling layer and heat-sealing layer;Wherein, peeling layer is divided into first peeling part and second peeling part, and the peeling strength of second peeling part is higher than the peeling strength of first peeling part.The utility model is by setting a peeling layer by low intensity and high intensity area, and control the binding force difference between it and printing substrate layer and heat-sealing layer, can when needing recycling, let user easily start peeling from a preset low intensity area, and along the preset, interface of relatively weak binding force, packaging is stably separated into printing substrate layer and heat-sealing layer two material components.

Description

Technical Field

[0001] This utility model relates to the field of packaging materials technology, and in particular to a peelable and recyclable packaging and packaging bag. Background Technology

[0002] With increasing environmental awareness and the development of the circular economy, the recyclability of packaging materials has become a focus of industry attention. Currently, most mainstream flexible packaging on the market is a multi-layered composite structure, using materials such as BOPP (biaxially oriented polypropylene), PET (polyethylene terephthalate), and NY (nylon) as printing substrates, bonded to heat-sealing materials such as CPP (cast polypropylene) and PE (polyethylene) with adhesives. While this structure meets the requirements for printing, protection, and heat sealing, it presents some problems: First, the various layers of materials (such as the printing layer, adhesive layer, and heat-sealing layer) are tightly bonded, making effective separation difficult. During recycling, they are typically only treated as mixed waste for downgrading, or incinerated or landfilled, failing to achieve multi-value recovery (upgraded recycling) and wasting valuable resources. Second, separating the components of these composite materials requires complex physical or chemical methods (such as solvent dissolution or high-temperature treatment), resulting in cumbersome processes, high energy consumption, and the potential for secondary pollution, leading to high recycling costs and environmental burdens.

[0003] These shortcomings severely restrict the sustainable development of the packaging industry. Therefore, there is an urgent need to develop a packaging structure that facilitates the separation of components during recycling, in order to achieve efficient and high-quality recycling and promote the closed-loop circulation of materials. Utility Model Content

[0004] The main purpose of this utility model is to provide a peelable and recyclable packaging and bag to solve the above-mentioned technical problems.

[0005] The objective of this utility model can be achieved by adopting the following technical solution: A peelable and recyclable package includes a printed substrate layer, a release layer, and a heat-sealing layer distributed sequentially from the outside to the inside; the bonding force between the release layer and the printed substrate layer is greater than the bonding force between the release layer and the heat-sealing layer; wherein the release layer is divided into a first release portion and a second release portion, and the release strength of the second release portion is higher than the release strength of the first release portion.

[0006] The first peeling portion is a coating formed by continuous application of release agent; at least a portion of the first peeling portion is located at the edge of the packaging, and the first peeling portion is disposed adjacent to the second peeling portion.

[0007] The peeling layer is further divided into a third peeling portion, the peeling strength of the third peeling portion being higher than that of the first peeling portion and lower than that of the second peeling portion; the third peeling portion is surrounded and / or divided by the second peeling portion.

[0008] The second and third peeling portions are both coatings formed by continuous application of release agent, and each coating contains an array of blank dot-like structures where the release agent is not applied.

[0009] The diameter of the blank dot structure in the second peeling part is larger than that in the third peeling part, and the density of the blank dot structure in the second peeling part is lower than that in the third peeling part.

[0010] The diameter of the blank dot-like structures in the second peeling section is 1.00-2.00 mm, and the density is 9-20 per cm³. 2 .

[0011] The diameter of the blank dot-like structures in the third peeling section is 0.25-0.50 mm, and the density is 40-70 per cm³. 2 .

[0012] It also includes a protective layer, a first adhesive layer and a first ink layer distributed sequentially from the outside to the inside, the first ink layer being disposed on the outer surface of the printed substrate layer; and a second adhesive layer being disposed between the inner surface of the release layer and the outer surface of the heat-sealing layer.

[0013] It also includes a scratch-resistant varnish layer and a second ink layer distributed sequentially from the outside to the inside, the second ink layer being disposed on the outer surface of the printed substrate layer; a third adhesive layer is disposed between the inner surface of the release layer and the outer surface of the heat-sealing layer.

[0014] A packaging bag includes a bag body formed by the packaging as described above, wherein the edge of the bag body is provided with a peeling tab corresponding to the position of the first peeling portion.

[0015] The beneficial technical effects of this utility model are as follows: By setting a peeling layer composed of low-strength and high-strength regions and controlling the difference in bonding force between the peeling layer and the printed substrate layer and the heat-sealing layer, this utility model ensures that the packaging remains structurally intact and is not prone to accidental delamination during normal transportation, storage, and use. When recycling is required, users can easily initiate peeling from a preset low-strength region (first peeling section) and stably separate the packaging into two material components, the printed substrate layer (outer layer) and the heat-sealing layer (inner layer), along a preset interface with weaker bonding force (between the peeling layer and the heat-sealing layer). This effectively solves the problem of the difficulty in separating the tightly bonded layers of existing composite packaging materials, avoids the downgraded recycling of mixed waste, achieves high-value upgraded recycling, and eliminates the need for complex physical or chemical separation methods, reducing recycling costs, energy consumption, and environmental pollution, and promoting the closed-loop circulation of packaging materials. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a single-layer packaging structure provided for an embodiment of this utility model; Figure 2 A schematic diagram of the peeling layer in the packaging provided in this embodiment of the utility model; Figure 3 This is a schematic diagram of another layered structure of packaging provided in an embodiment of the present utility model; Figure 4 A three-dimensional schematic diagram of the packaging bag provided for an embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures: In the diagram: 20-printed substrate layer, 30-release layer, 31-first release part, 32-second release part, 33-third release part, 40-heat seal layer, 50-protective layer, 51-first adhesive layer, 52-first ink layer, 60-second adhesive layer, 70-anti-scratch varnish layer, 71-second ink layer, 80-third adhesive layer, 91-bag body, 92-release sheet. 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, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0021] 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 scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0023] like Figures 1-3 As shown in the illustration, this utility model provides a peelable and recyclable packaging that allows for easy separation of different material layers after use, facilitating sorting, recycling, and reuse. The packaging includes a printed substrate layer 20, a release layer 30, and a heat-sealing layer 40, distributed sequentially from the outside to the inside. The bonding force between the release layer 30 and the printed substrate layer 20 is greater than the bonding force between the release layer 30 and the heat-sealing layer 40. The release layer 30 is divided into a first release portion 31 and a second release portion 32, with the second release portion 32 exhibiting a higher release strength than the first release portion 31.

[0024] In this embodiment, the printing substrate layer 20 serves as the printing and support layer for the packaging. The printing substrate layer 20 can be made of biaxially oriented polypropylene (BOPP) film, polyethylene terephthalate (PET) film, or paper, etc. The outer surface of the printing substrate layer 20 is used for printing product information, brand logos, and other patterns and text, while its inner surface is used to support the subsequently installed release layer 30.

[0025] The heat-sealing layer 40 is the innermost layer of the packaging, which comes into direct or indirect contact with the contents of the packaging and provides the function of sealing the packaging. The heat-sealing layer 40 can be made of materials with good heat-sealing properties, such as cast polypropylene (CPP) film or polyethylene (PE) film.

[0026] The release layer 30 is disposed between the printed substrate layer 20 and the heat-sealing layer 40. The release layer 30 is formed by applying a release agent to the inner surface of the printed substrate layer 20 through a specific process (e.g., a reverse printing process). The placement of the release layer 30 results in two bonding interfaces in the entire packaging structure: one between the printed substrate layer 20 and the release layer 30, and the other between the release layer 30 and the heat-sealing layer 40.

[0027] To ensure that separation occurs along a predetermined path when peeling is required, this embodiment designs the bonding force between the two interfaces so that the bonding force between the release layer 30 and the printed substrate layer 20 is greater than the bonding force between the release layer 30 and the heat-sealing layer 40. Specifically, the release agent itself has strong adhesion to the printed substrate layer 20 (such as BOPP or PET), ensuring a strong bond between the two. The heat-sealing layer 40 is bonded to the surface of the release layer 30 containing the release agent using an adhesive. By selecting the adhesive, the bonding force (i.e., peel force) between the release layer 30 and the heat-sealing layer 40 (adhesive) is kept at a low and controllable level. Thus, when an external force is applied to tear the packaging, the breakage will preferentially occur at the interface between the release layer 30 and the heat-sealing layer 40, where the bonding force is weaker, thereby achieving complete separation between the printed substrate layer 20 (along with the printing ink and release layer thereon) and the heat-sealing layer 40.

[0028] Furthermore, to optimize the operator's peeling experience and ensure the structural integrity of the packaging during normal use, the peel layer 30 is not a uniform whole, but is divided into regions with different peel strengths. Specifically, the peel layer 30 is at least divided into a first peeling portion 31 and a second peeling portion 32.

[0029] The first peeling section 31 has low peel strength. This area can be designed as the starting point for peeling, where the operator can easily begin the peeling action. The low peel strength means that the operator only needs to apply a small amount of force to initiate the separation process.

[0030] The second peeling portion 32 has a higher peel strength than the first peeling portion 31. This area exists to ensure that the packaging does not delaminate unintentionally when not deliberately peeled (such as during transportation, storage, and normal use), thus maintaining the integrity and protective function of the packaging. The higher peel strength provides the necessary structural stability for the packaging.

[0031] These two regions with different peel strengths can be achieved by adjusting the coating method, coating amount, or chemical formulation of the release agent, thereby forming different regions with functional gradients on the same release layer 30, taking into account both easy peeling and structural stability.

[0032] In summary, by setting a release layer 30 between the printed substrate layer 20 and the heat-sealing layer 40, and controlling the bonding force between the release layer 30 and the layers on both sides, the packaging can be easily and completely separated along a preset interface (between the release layer and the heat-sealing layer 40). This effectively solves the problem of difficulty in separating the layers of existing composite packaging materials due to their tight bonding, achieving easy tearing and separation of the packaging, and simplifying the process and difficulty of downstream recycling and sorting. After separation, the printed substrate layer 20 with printing ink and the clean heat-sealing layer 40 are separated into two independent parts. The heat-sealing layer 40 material (such as CPP, PE) contains almost no ink residue, has high purity, and can be directly used for high-value recycling manufacturing. In addition, the release layer 30 is divided into a first release part 31 and a second release part 32 with different peel strengths, so that during normal use and circulation, the packaging relies on the second release part 32 with higher peel strength to maintain the integrity of the structure and prevent accidental delamination; while when recycling is required, the operator can easily start the separation process from the first release part 31 with lower peel strength. The design balances the reliability of the packaging bag as a product container with its ease of disposal as a recyclable material.

[0033] In this embodiment, peel strength refers to the magnitude of the bonding force that needs to be overcome between the peel layer 30 and the heat-sealing layer 40 when an external force is applied to peel the packaging. The level of peel strength directly affects the ease of peeling: when the peel strength is low, separation is easier to occur; when the peel strength is high, greater force is required to achieve separation, thereby providing better structural stability.

[0034] In one embodiment, the peeling layer 30 is further divided into a third peeling portion 33, the peeling strength of the third peeling portion 33 being higher than that of the first peeling portion 31 and lower than that of the second peeling portion 32; the third peeling portion 33 is surrounded and / or divided by the second peeling portion 32.

[0035] In this embodiment, the peel strength of the three peeling portions is related as follows: the peel strength of the second peeling portion 32 is higher than that of the third peeling portion 33, and the peel strength of the third peeling portion 33 is higher than that of the first peeling portion 31. In other words, the second peeling portion 32 has the highest peel strength, the third peeling portion 33 has a moderate peel strength, and the first peeling portion 31 has the lowest peel strength.

[0036] The first peeling section 31, being the area with the lowest peeling strength, primarily functions as the "starting point" or "trigger point" for peeling, allowing the operator to effortlessly initiate the separation process.

[0037] The second peeling section 32, being the area with the highest peeling strength, primarily functions as a "structural reinforcing rib" or "skeleton" for the packaging, ensuring sufficient structural strength and sealing integrity before the packaging is actively peeled off, thus preventing accidental delamination during routine handling, storage, and use.

[0038] The third peeling section 33, as a region with moderate peeling strength, has the main function of moderately improving the interfacial bonding to obtain moderate peeling strength, so that peeling can proceed smoothly under controlled damping.

[0039] In terms of spatial layout, to ensure the synergistic effect of the aforementioned functions, the third peeling section 33 is surrounded and / or divided by the second peeling section 32. A typical layout is that the second peeling sections 32 are distributed in a grid pattern, while the third peeling section 33 fills the grid formed by the second peeling sections 32. This design allows the second peeling sections 32, with their highest strength, to form a stable framework for the entire packaging surface, while the third peeling section 33 ensures a smooth overall peeling process. When peeling occurs, the peeling path starts from the first peeling section 31 and then passes through the area jointly formed by the second and third peeling sections 32 and 33, thus achieving a smooth and continuous peeling experience from easy to stable. Therefore, the packaging remains secure during normal circulation and can be layered along a predetermined path during the recycling stage, facilitating the outer and inner layers to enter their respective recycling streams.

[0040] In one embodiment, the first peeling portion 31 is a coating formed by continuous application of release agent; at least a portion of the first peeling portion 31 is located at the edge of the packaging, and the first peeling portion 31 is disposed adjacent to the second peeling portion 32.

[0041] In this embodiment, the first release portion 31 is a continuous coating formed by the release agent. This means that within the area covered by the first release portion 31, the release agent is 100% applied to the inner surface of the printed substrate layer 20, forming a complete and uninterrupted release layer. Due to the presence of this continuous release agent coating, when the subsequent adhesive and heat-sealing layer 40 are applied, the adhesive cannot penetrate the coating to directly contact the printed substrate layer 20. Therefore, in this area, the bonding force between the heat-sealing layer 40 and the printed substrate layer 20 (through the release layer) is very weak, i.e., the peel strength is extremely low, achieving an effect of "virtually no bonding strength".

[0042] Furthermore, at least a portion of the first peeling section 31 is located at the edge of the packaging. This positioning design facilitates the operator to begin the peeling operation from the edge of the packaging, for example, by providing this area on the side or corner of the packaging bag, allowing the operator to easily initiate the entire peeling process.

[0043] Furthermore, to ensure the continuity and smooth transition of the peeling process, the first peeling section 31 and the second peeling section 32 are arranged adjacent to each other. Specifically, the first peeling section 31 can extend along the edge of the packaging for a certain distance and directly adjoin the second peeling section 32. This arrangement allows the peeling front to immediately and seamlessly enter the second peeling section 32, which has a higher peeling strength, once the operator starts tearing from the first peeling section 31, which has the lowest peeling strength. This design avoids jumps or interruptions in the peeling process, forming a guided peeling path from easy to difficult, and preventing arbitrary deviations in the peeling path.

[0044] In one embodiment, the second peeling portion 32 and the third peeling portion 33 are both coatings formed by continuous application of release agent, and each coating is provided with an array of blank dot-like structures in which the release agent is not applied.

[0045] In this embodiment, the coating is formed by applying a release agent to the inner surface of the printed substrate layer 20 using a reverse printing process. Specifically, the release agent is applied to all areas except for the "dot structure," forming a release coating with numerous "windows" or "openings." These uncoated "windows" are the blank dot structures.

[0046] In this structure, the subsequent adhesive forms a weak bond in the background area where the release agent is applied, making it easy to peel off; while in the blank dotted structure (i.e., areas without release agent), the adhesive can directly contact the printed substrate layer 20, forming strong bond anchors. The introduction of these blank dotted structures allows the overall peel strength of the second peeling section 32 and the third peeling section 33 to be controlled by adjusting the distribution of the blank dots. Specifically, areas with larger blank dot areas have higher peel strength because there are more blank areas and stronger adhesion; conversely, areas with smaller blank dot areas have lower peel strength. Through this design, the second peeling section 32 and the third peeling section 33 can achieve a preset strength gradient, ensuring the controllability and stability of the peeling process while maintaining the integrity of the packaging.

[0047] In one embodiment, the diameter of the blank dot structure of the second peeling portion 32 is larger than the diameter of the blank dot structure of the third peeling portion 33, and the density of the blank dot structure of the second peeling portion 32 is lower than the density of the blank dot structure of the third peeling portion 33.

[0048] In this embodiment, the second peeling section 32 employs a "large diameter, medium-low density" array of blank dots. This "sparse, large dot" structure, although the dots are spaced far apart, provides each dot with a substantial area of ​​strong adhesive "anchor point." These large anchor points effectively resist initial tearing forces, ensuring the structural integrity of the packaging during normal use and preventing accidental delamination.

[0049] The third peeling section 33 employs a "small diameter, high density" array of blank dots. This "dense dot" structure evenly disperses the strongly bonded area into many tiny adhesive dots. The adhesive force of these individual dots is relatively weak, and during peeling, the tearing force can smoothly and continuously destroy these small adhesive dots, resulting in a stable and controllable peeling feel, facilitating the smooth progress of the peeling process.

[0050] In one embodiment, the diameter of the blank dot-like structure of the second peeling portion 32 is 1.00-2.00 mm, and the density is 9-20 dots / cm². 2 .

[0051] In this embodiment, the parameter selection results in the blank dot structure of the second peeling section 32 exhibiting a "sparse large dot" distribution characteristic: the diameter of each blank dot is relatively large, for example, 1.50 mm, and the covered blank area is correspondingly increased, but the spacing between the blank dots is relatively large, and the density is relatively low, for example, 15 dots / cm. 2 This design leaves a relatively large continuous coating area (release agent area). Under these parameters, the blanking point structure of the second peeling section 32 can act as a "structural reinforcement area" for the packaging, providing sufficient interfacial bonding force during normal use, transportation, and storage to prevent accidental delamination or separation. Simultaneously, during the recycling peeling stage, this design allows the peeling force to maintain high resistance at the blanking points while locally decreasing in the coating area, ensuring a stable peeling process.

[0052] In one embodiment, the diameter of the blank dot-like structures in the third peeling portion 33 is 0.25-0.50 mm, and the density is 40-70 dots / cm³. 2 .

[0053] In this embodiment, the parameter selection results in the blank dot structure of the third peeling section 33 exhibiting a "dense dot" distribution characteristic: each blank dot has a small diameter, for example, 0.40 mm, and covers a limited blank area, but the blank dots are very densely distributed, with a high density, for example, 55 dots / cm². 2The adhesive's strong bonding areas are cut into numerous small fragments. These parameters ensure that the peel strength of the blanking point structure in the third peeling section 33 is relatively moderate, serving as an "auxiliary peeling zone" to provide appropriate resistance during peeling and promote smooth separation. Simultaneously, this design ensures a matching strength gradient between the third peeling section 33 and the second peeling section 32, creating a continuous transition within the layout surrounded and divided by the second peeling section 32, thus improving peel control.

[0054] In one embodiment, the material further includes a protective layer 50, a first adhesive layer 51, and a first ink layer 52 distributed sequentially from the outside to the inside, wherein the first ink layer 52 is disposed on the outer surface of the printed substrate layer 20; and a second adhesive layer 60 is disposed between the inner surface of the release layer 30 and the outer surface of the heat-sealing layer 40.

[0055] In this embodiment, the packaging further includes a protective layer 50, a first adhesive layer 51, and a first ink layer 52, distributed sequentially from the outside to the inside. The first ink layer 52 is disposed on the outer surface of the printing substrate layer 20. Specifically, the protective layer 50 is located on the outermost layer of the packaging and can be made of transparent biaxially oriented polypropylene (BOPP) film or polyethylene terephthalate (PET) film, providing wear-resistant, scratch-resistant, and waterproof protection to ensure that the packaging is protected from external damage during transportation and use. The first adhesive layer 51 is disposed between the protective layer 50 and the first ink layer 52 to firmly bond the protective layer 50 to the first ink layer 52. The first adhesive layer 51 can be made of polyurethane-based adhesive or other adhesives suitable for film lamination to ensure stable interlayer bonding without affecting transparency. The first ink layer 52 is directly printed on the outer surface of the printing substrate layer 20 to display brand logos, product information, and other patterns and text. It can be printed using solvent-based or water-based inks through flexographic or gravure printing processes.

[0056] Furthermore, a second adhesive layer 60 is provided between the inner surface of the release layer 30 and the outer surface of the heat-sealing layer 40. This second adhesive layer 60 is used to bond the heat-sealing layer 40 and the release layer 30 together. Its adhesive strength is such that the overall bonding force between the release layer 30 and the heat-sealing layer 40 is less than the bonding force between the release layer 30 and the printing substrate layer 20, thus facilitating separation during the recycling stage. This layered structure design not only enhances the protective properties of the packaging and the printing quality but also ensures the realization of the peeling function: when peeling, separation occurs at the interface between the second adhesive layer 60 and the release layer 30, separating the outer layer (protective layer, first adhesive layer 51, first ink layer 52, and printing substrate layer 20 along with the release layer) from the inner layer (heat-sealing layer), facilitating separate recycling.

[0057] In one embodiment, the material further includes a scratch-resistant varnish layer 70 and a second ink layer 71 distributed sequentially from the outside to the inside, the second ink layer 71 being disposed on the outer surface of the printing substrate layer 20; a third adhesive layer 80 is disposed between the inner surface of the release layer 30 and the outer surface of the heat-sealing layer 40.

[0058] In this embodiment, the packaging further includes a scratch-resistant varnish layer 70 and a second ink layer 71 distributed sequentially from the outside to the inside, wherein the second ink layer 71 is disposed on the outer surface of the printing substrate layer 20. Specifically, the scratch-resistant varnish layer 70 is located on the outermost layer of the packaging, providing scratch resistance, abrasion resistance, and enhancing surface gloss. The second ink layer 71 is directly printed on the outer surface of the printing substrate layer 20, used to display brand logos, product information, and other graphic text.

[0059] Furthermore, a third adhesive layer 80 is provided between the inner surface of the release layer 30 and the outer surface of the heat-sealing layer 40. This third adhesive layer 80 is used to bond the heat-sealing layer 40 and the release layer 30 together. Its adhesive strength is such that the overall bonding force between the release layer 30 and the heat-sealing layer 40 is less than the bonding force between the release layer 30 and the printing substrate layer 20, thereby facilitating separation during the recycling stage. This layered structure design not only provides economical and effective surface protection and printing effect, but also ensures the realization of the peeling function: when peeling, separation occurs at the interface between the third adhesive layer 80 and the release layer 30, separating the outer layer (anti-scratch varnish layer, second ink layer 71, and printing substrate layer 20 together with the release layer) from the inner layer (heat-sealing layer), facilitating separate recycling.

[0060] like Figure 4 As shown, corresponding to the above-mentioned recyclable packaging, this utility model embodiment also provides a packaging bag, which includes a bag body 91 formed by the packaging described in the aforementioned embodiment. Specifically, the bag body 91 is processed by cutting, folding, and heat-sealing the recyclable packaging material described in the aforementioned embodiment, for example, forming a back-sealed bag, a three-seal bag, a four-seal bag, or a stand-up pouch. The packaging material, from the outside to the inside, includes a printed substrate layer 20, a release layer 30, and a heat-sealing layer 40. The bonding force between the release layer 30 and the printed substrate layer 20 is greater than the bonding force between the release layer 30 and the heat-sealing layer 40. The release layer 30 is divided into a first release portion 31 and a second release portion 32, and the peel strength of the second release portion 32 is higher than the peel strength of the first release portion 31.

[0061] Furthermore, the edge of the bag body 91 is provided with a peeling tab 92 corresponding to the position of the first peeling portion 31. This peeling tab 92 is part of the structure of the bag body 91 and is triangular or arc-shaped, making it easy for the operator to grip and apply force. Specifically, the peeling tab 92 is located on the side or corner of the bag body 91, corresponding to the first peeling portion 31 (i.e., the area with the lowest peel strength) in the peeling layer 30, ensuring that the peeling action starts from this portion. With this design, when recycling is required after use, the operator can grasp the peeling tab 92 and pull it outwards. The peeling force will preferentially act on the first peeling portion 31, causing the interface between the peeling layer 30 and the heat-sealing layer 40 to separate, thereby separating the outer layer (including the printed substrate layer 20 and the peeling layer 30, etc.) of the bag body 91 from the inner layer (heat-sealing layer), facilitating sorting and recycling.

[0062] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model 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 this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A peelable and recyclable packaging, characterized in that, It includes a printed substrate layer, a release layer, and a heat-sealing layer distributed sequentially from the outside to the inside; the bonding force between the release layer and the printed substrate layer is greater than the bonding force between the release layer and the heat-sealing layer; wherein, the release layer is divided into a first release portion and a second release portion, and the release strength of the second release portion is higher than the release strength of the first release portion.

2. The packaging according to claim 1, characterized in that, The first peeling portion is a coating formed by continuous application of release agent; at least a portion of the first peeling portion is located at the edge of the packaging, and the first peeling portion is disposed adjacent to the second peeling portion.

3. The packaging according to claim 1, characterized in that, The peeling layer is further divided into a third peeling portion, the peeling strength of the third peeling portion being higher than that of the first peeling portion and lower than that of the second peeling portion; the third peeling portion is surrounded and / or divided by the second peeling portion.

4. The packaging according to claim 3, characterized in that, Both the second and third peeling portions are coatings formed by continuous application of release agent, and each coating contains arrayed blank dot-like structures where the release agent is not applied.

5. The packaging according to claim 4, characterized in that, The diameter of the blank dot structure in the second peeling part is larger than the diameter of the blank dot structure in the third peeling part, and the density of the blank dot structure in the second peeling part is lower than the density of the blank dot structure in the third peeling part.

6. The packaging according to claim 5, characterized in that, The diameter of the blank dot-like structures in the second peeling section is 1.00-2.00 mm, and the density is 9-20 per cm³. 2 .

7. The packaging according to claim 5, characterized in that, The diameter of the blank dot-like structures in the third peeling section is 0.25-0.50 mm, and the density is 40-70 per cm³. 2 .

8. The packaging according to claim 1, characterized in that, It also includes a protective layer, a first adhesive layer and a first ink layer distributed sequentially from the outside to the inside, the first ink layer being disposed on the outer surface of the printed substrate layer; and a second adhesive layer being disposed between the inner surface of the release layer and the outer surface of the heat-sealing layer.

9. The packaging according to claim 1, characterized in that, It also includes a scratch-resistant varnish layer and a second ink layer distributed sequentially from the outside to the inside, the second ink layer being disposed on the outer surface of the printed substrate layer; a third adhesive layer is disposed between the inner surface of the release layer and the outer surface of the heat-sealing layer.

10. A packaging bag, characterized in that, The bag body is formed by the packaging according to any one of claims 1 to 9, and the edge of the bag body is provided with a peeling piece corresponding to the position of the first peeling portion.

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