Packaging box with transparent isolation display area and forming method of packaging box

Abstract

The invention discloses a packaging box with a transparent isolation display area and a forming method thereof, the packaging box comprises a box body and a transparent layer, and the box body is formed by a compacted packaging plate; a hollow window is formed in at least one forming wall of the box body, a bearing locking part is integrally pressed on the periphery of the hollow window, the bearing locking part comprises an annular groove and a supporting step, the transparent layer comprises a transparent area matched with the hollow window in a profiling mode, a composite outer edge is arranged on the periphery of the transparent area, and the outer edge of the composite outer edge is matched with the annular groove. The composite outer edge comprises an attaching edge and a peripheral bending edge used for being embedded into the annular groove. And the composite outer edge is bonded and compounded with the bearing locking part. An integrated punching pressing and embedding locking structure is adopted, the transparent layer is firmly assembled, and edge warping, falling and displacement are not prone to occurring. No bubbles and no excessive glue exist in compounding, and the appearance is flat and attractive. The supporting step and the decorative coating have the functions of positioning, decorating and glue covering, the machining precision is high, and the visual texture is high. The structure and thickness parameters are matched with a plate compacting technology, the strength is reliable, and machining is efficient.

Description

Technical Field

[0001] This invention relates to a packaging box with a transparent, isolated display area and its forming method, belonging to the technical field of product packaging. Background Technology

[0002] Packaging boxes serve multiple functions, including product protection, visual display, and brand image enhancement, making them a crucial medium in product distribution. Currently, the industry categorizes transparent display packaging boxes into three tiers based on product positioning, cost budget, and perceived quality. Each tier corresponds to specific substrates and processing techniques: low-end packaging primarily uses ordinary corrugated cardboard, mid-to-high-end packaging uses pressed board as its core substrate, and high-end luxury packaging utilizes metal materials. Packaging boxes with transparent display areas allow for a visible view of the internal product and are widely used in industries such as cosmetics, digital products, cultural and creative products, and gifts, representing the mainstream form of mid-to-high-end packaging.

[0003] Ordinary corrugated cardboard is low in cost but lacks structural strength, making it only suitable for temporary packaging of simple, low-value products. Its durability and aesthetics are poor, and its transparent areas are typically simply glued together, resulting in poor sturdiness and appearance. Solid-pack packaging uses solid, compressed cardboard, which is stiff, resistant to deformation, and is the preferred material for mid-to-high-end gift boxes. However, current processing techniques for the transparent areas are relatively crude. Metal packaging boxes use metal layers, fixing the transparent components through riveting and interlocking. They offer a high-end feel and strong sturdiness, but the high cost of raw materials and processing makes large-scale adoption difficult.

[0004] Corrugated cardboard and solid-press packaging boxes are both paper structures, with their transparent layers bonded to the cardboard only by a single layer of glue. After long-term storage or bumpy transportation, problems such as delamination, curling, and shifting easily occur. Inner-attached structures, lacking effective support, are prone to collapse and deformation, not only compromising packaging integrity but also causing damage to the internal products. Outer-attached transparent layers have exposed edges, frequently exhibiting glue overflow, rough edges, and uneven splicing, resulting in a noticeably rough finish. While mid-to-high-end solid-press packaging boards themselves have a superior feel, the combination with a simple, glued transparent layer significantly lowers the overall quality, highlighting a cheap appearance. Without a reinforcement structure at the bond between the transparent layer and the cardboard, they are easily deformed under external pressure, leading to a high probability of the transparent layer breaking and packaging damage, failing to guarantee product safety during transportation. While the riveting and embedding process of metal packaging is excellent, it is too costly. Mid-to-high-end solid-press packaging boards lack matching high-quality transparent layer fixing processes, failing to balance texture, sturdiness, and cost control. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art and to propose a packaging box with a transparent isolation display area and its forming method, which addresses the problems of poor adhesion of the transparent layer of traditional paper packaging boxes, poor aesthetics, cheap appearance, and easy damage during turnover and transportation.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A packaging box with a transparent isolated display area includes a box body and a transparent layer, wherein the box body is formed from a solid-pressure packaging board; At least one of the constituent walls of the box body is provided with a perforated window for mounting the transparent layer. A supporting and locking part is integrally pressed around the outer periphery of the perforated window. The supporting and locking part includes an annular groove and a supporting step. The annular groove is located on the side of the supporting step away from the perforated window and faces the outside of the box body. The transparent layer includes a transparent area that conforms to the shape of the openwork window. The outer periphery of the transparent area is provided with a composite outer edge. The composite outer edge includes an fitting edge for fitting with the supporting step and an outer peripheral bent edge for embedding into the annular groove. The composite outer edge is bonded to the supporting and locking part.

[0007] Preferably, the perforated window and the supporting locking part are integrally punched and pressed.

[0008] Preferably, the supporting and locking part is provided with a hot melt adhesive layer, and the composite outer edge is hot-molded and composited with the supporting and locking part.

[0009] Preferably, the outer peripheral bending edge is a thermoformed structure.

[0010] Preferably, the sidewall of the supporting step facing the open window has a chamfered arc surface, and the supporting step has a decorative coating to create a metallic reflective effect.

[0011] Preferably, the wall of the box body with the perforated window is flush with the surface of the corresponding transparent layer.

[0012] Preferably, the wall of the box body with the hollowed-out window is covered with a decorative surface layer, and the decorative surface layer is provided with a through-avoidance area that is aligned with the outer peripheral bending edge. The decorative surface layer is flush with the surface of the transparent layer.

[0013] Preferably, the depth of the annular groove is less than or equal to 1 / 2 of the thickness of the constituent wall; The thickness of the wall is 1.5mm to 3.5mm; The transparent layer is a transparent plastic sheet, and the thickness of the transparent layer is 0.3mm to 1.1mm.

[0014] The present invention also proposes a packaging box forming method for forming the packaging box, comprising the following steps: S1 cutting: Cut the packaging board according to the structure of the packaging box to form a board that forms the wall or contains the wall. S2 stamping and cutting simultaneously processes hollow windows, annular grooves, and supporting steps on the constituent walls; S3 transparent layer preparation: Pre-fabricate the corresponding transparent layer according to the hollowed-out window; S4 bonding composite: A hot melt adhesive layer is set on the supporting and locking part, and the transparent layer and the hollow window are aligned and then hot molded composite is performed. S5 molding processes the formed structural walls into a packaging box with a transparent, isolated display area.

[0015] Preferably, in step S4, the outer peripheral bend is formed during hot molding composite.

[0016] The beneficial effects of this invention are mainly reflected in: 1. It adopts an integrated punching and pressing and interlocking structure, and the transparent layer is firmly assembled, making it less prone to curling, falling off, or shifting.

[0017] 2. Hot molding and hot melt adhesive flow and leveling result in a smooth and aesthetically pleasing finish with no bubbles or excess adhesive.

[0018] 3. The supporting steps and decorative coating have the functions of positioning, decoration and masking, with high processing precision and strong visual texture.

[0019] 4. The structure and thickness parameters are adapted to the solid pressing process, ensuring reliable strength and efficient processing. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is an exploded structural diagram of the wall forming the packaging box of the present invention, which has a transparent and isolated display area.

[0021] Figure 2 This is a cross-sectional structural diagram of the transparent isolation display area in the packaging box of the present invention.

[0022] Figure 3 This is a cross-sectional structural diagram of a preferred embodiment of the transparent isolation display area in a packaging box of the present invention.

[0023] Figure 4 This is a flowchart of the packaging box forming method of the present invention.

[0024] Figure 5 This is a flowchart illustrating a preferred embodiment of the packaging box forming method of the present invention.

[0025] Figure 6 This is a photograph of the transparent isolation display area of ​​the packaging box of this invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0028] This invention provides a packaging box with a transparent, isolated display area, such as... Figures 1 to 3 As shown, it includes a box body and a transparent layer 1. The box body 1 is formed by pressing a packaging board.

[0029] At least one of the constituent walls 2 of the box body has a perforated window 3 for mounting a transparent layer. The outer periphery of the perforated window 3 is integrally pressed with a supporting locking part 4. The supporting locking part 4 includes an annular groove 41 and a supporting step 42. The annular groove 41 is located on the side of the supporting step 42 away from the perforated window 3, and the annular groove 41 faces the outside of the box body 1.

[0030] The transparent layer 1 includes a transparent area that conforms to the shape of the perforated window. The outer periphery of the transparent area 1 is provided with a composite outer edge 5. The composite outer edge 5 includes an fitting edge 51 for fitting with the supporting step and an outer peripheral bending edge 52 for embedding into the annular groove.

[0031] The composite outer edge is bonded to the supporting and locking part.

[0032] Detailed implementation process and principle explanation: Compact packaging board is an existing technology and a mid-to-high-end material in the packaging industry. It is primarily made from recycled waste paper pulp or wood pulp / bamboo fiber, and can be single-layer or multi-layer composites. Some formulations incorporate modifiers such as starch adhesives and water-based resins to improve moisture resistance and adhesion. It boasts superior structural strength and support reliability.

[0033] This packaging box is made of solid pressure packaging board. Taking advantage of the material characteristics of the board, such as high density, good structural strength and easy one-piece molding, a hollow window is directly formed on the wall of the box through a pressing process. A supporting and locking part composed of annular grooves and supporting steps is integrally processed on the outer circumference of the window.

[0034] The support step provides a flat support surface for the transparent layer, and the annular groove is set outward to form a fitting and limiting relationship with the outer edge of the transparent layer. The transparent layer realizes product display by conforming to the transparent area of ​​the window. Its outer periphery composite edge is respectively fitted with the support step by the fitting edge and embedded in the annular groove by the outer periphery bend edge, forming a dual positioning constraint in the radial and axial directions.

[0035] By bonding and bonding the transparent layer with the supporting and locking parts, the transparent layer is integrated into a whole, which ensures that the transparent layer is firmly installed, stable in position, and has a flat surface. It is not easy to loosen, curl up or fall off during use. At the same time, it makes the overall structure of the packaging box reliable and the appearance neat, meeting the requirements for transparent display and protection.

[0036] In one specific embodiment, the perforated window 3 and the supporting locking part 4 are integrally punched and pressed.

[0037] By adopting a simultaneous punching and pressing forming process, the punching of the hollow window 3 and the pressing of the supporting locking part 4 are completed in one go on the constituent wall 2, so that the hollow window 3, the annular groove 41 and the supporting step 42 form an integral structure in the same process, without the need for secondary processing or splicing.

[0038] This molding method ensures high dimensional accuracy and good positional consistency of the supporting locking part 4, strong structural integrity with the box body 1, avoids edge cracking, delamination or deformation, simplifies processing procedures, improves production efficiency and product qualification rate, and provides a stable and accurate installation foundation for the assembly of the transparent layer 1.

[0039] In one specific embodiment, a hot melt adhesive layer 6 is provided on the supporting and locking part, and the composite outer edge is hot-molded and composited with the supporting and locking part.

[0040] By setting a hot melt adhesive layer 6 on the supporting and locking part, the hot melt adhesive melts when heated during the hot molding and bonding process and has good fluidity. It can flow evenly on the structural surfaces of the annular groove 41 and the supporting step 42, fully filling the gap between the bonding edge 51, the outer peripheral bending edge 52 and the supporting and locking part 4, so that the bonding interface is dense, flat and free of air bubbles.

[0041] Under the pressure of the hot mold, the outer edge of the transparent layer is tightly bonded to the supporting locking part. After cooling, the hot melt adhesive solidifies to form a continuous and stable bonding structure, which not only ensures that the transparent layer is firmly assembled and accurately positioned, but also makes the surface of the joint smooth. This effectively avoids warping, loosening and appearance defects caused by air bubbles and insufficient adhesive, and improves the overall assembly quality and reliability of the product.

[0042] In one specific embodiment, the outer peripheral bending edge 52 is a thermoformed structure.

[0043] Utilizing the thermoplasticity of the transparent layer itself, during thermoforming assembly, directional heat and pressure are applied to the corresponding annular groove on the outer periphery of the transparent layer using a mold. This causes the area to soften and bend upon heating, forming a folded outer periphery 52 that matches the annular groove. This structure eliminates the need for pre-bending processing, and the bending angle and dimensions closely match the annular groove, resulting in a tight fit. This avoids stress cracking and dimensional deviations caused by pre-bending, while also improving fit stability and ensuring a flat and secure assembly.

[0044] In one specific embodiment, the sidewall of the supporting step facing the open window is provided with a chamfered arc surface 7, and the supporting step is provided with a decorative coating for forming a metallic reflective effect.

[0045] The inner sidewall of the support step is provided with a chamfered arc surface 7, which can eliminate the stress of the sharp corners, prevent the transparent layer from being scratched and damaged during assembly, and facilitate the flow and guidance of hot melt adhesive, avoiding local glue accumulation and glue shortage.

[0046] The surface of the supporting steps is covered with a metallic decorative coating, which can not only cover the edge adhesive marks and enhance the appearance of the packaging box, but also enhance the visual layer of the display area with the help of reflective effect. In addition, the coating adheres to the surface of the dense solid packaging board, with strong adhesion and not easy to fall off, thus taking into account both aesthetics and structural practicality.

[0047] The decorative coating with the metallic reflective effect is not limited to designs that match curvature, and can also be achieved using methods such as iridescent layers. As long as it satisfies the need to enhance the metallic texture, it is within the scope of protection of this case.

[0048] In addition, the decorative coating can also play a visual positioning role in the punching and pressing process, serving as a reference for processing position accuracy. At the same time, it provides a precise alignment basis for the subsequent transparent layer thermal bonding process, ensuring that the relative positions of the perforated window, the supporting locking part, the transparent layer and the decorative surface layer are accurate and unified, effectively reducing assembly deviations and improving product processing consistency and finished product qualification rate.

[0049] In one specific embodiment, the casing is equipped with a perforated window forming wall 2 that is flush with the surface of the corresponding transparent layer.

[0050] The height of the supporting steps for the locking mechanism is designed to match the thickness of the transparent layer, ensuring that the outer surface of the transparent layer and the outer surface of the constituent wall are flush after assembly, with no height difference or step gaps. This flush structure not only improves the overall neatness of the packaging box's appearance but also prevents dust accumulation and scratches. Furthermore, it reduces the inconvenience of storage and stacking caused by assembly protrusions, further optimizing the product's user experience and visual appeal.

[0051] In one specific embodiment, the box body is equipped with a decorative surface layer 8 on the wall with a hollowed-out window. The decorative surface layer has a through-avoidance area that is aligned with the outer peripheral bending edge. The decorative surface layer is flush with the surface of the transparent layer.

[0052] The outer decorative surface layer 8 forms the outer wall, which can enhance the overall appearance and surface texture of the packaging box. A through-flow avoidance area is opened at the corresponding outer circumferential bending edge of the decorative surface layer to avoid the assembly structure of the transparent layer and avoid assembly interference.

[0053] By matching the thickness and positioning the assembly, the decorative surface layer and the outer surface of the transparent layer are kept flush, resulting in a smooth and continuous overall appearance without steps or drops. This not only improves the overall appearance and aesthetics but also facilitates packaging stacking, storage, and use.

[0054] In one specific embodiment, the depth of the annular groove is less than or equal to half the thickness of the wall; the thickness of the wall is 1.5mm to 3.5mm; the transparent layer is a transparent plastic sheet with a thickness of 0.3mm to 1.1mm.

[0055] The walls are made of 1.5mm to 3.5mm thick solid-press packaging board. This thickness range is suitable for the high-pressure compaction molding process of the board, which can not only ensure the overall pressure resistance and deformation resistance of the box body to meet the load-bearing requirements of handling and stacking, but also facilitate the one-piece punching and pressing of hollow windows and supporting locking parts, avoiding the difficulty of molding due to excessive thickness and the structural weakness due to excessive thinness.

[0056] The boards are preferably made from recycled wood pulp, bamboo pulp or waste paper pulp as the base material, and mixed with starch glue and water-based acrylic resin as modified binders to improve the moisture resistance and edge density of the boards, prevent delamination and edge chipping after molding, and take into account the processing precision.

[0057] The depth of the annular groove is controlled within 1 / 2 of the wall thickness to ensure sufficient fitting space along the outer circumferential bending edge, without damaging the continuity of the main structure of the wall, preventing stress concentration and cracking at the grooved area, and balancing the locking strength and the integrity of the board.

[0058] The transparent layer uses a transparent plastic sheet with a thickness of 0.3mm to 1.1mm, and the material can be flexibly selected for different application scenarios: Standard display packaging uses PET transparent sheets, which are tough, have high light transmittance, and are moderately priced, making them suitable for thermoforming and bending. High-end or wear-resistant packaging uses PC transparent sheets, which are impact-resistant, scratch-resistant, weather-resistant, and not easily broken. For scenarios requiring extremely high transparency and flatness, PVC transparent rigid sheets can be used; these have a smooth, non-crystalline surface and good heat-sealing adhesion. This thickness range ensures both the visibility of the transparent display area and its own bending resistance, while also allowing for precise matching with supporting steps and decorative surfaces, achieving a flush surface without protrusions or depressions, thus improving the overall appearance and assembly stability.

[0059] A method for forming a packaging box according to the present invention will be described, with reference to Figure 4 and Figure 5 As shown, it includes the following steps: Cutting: Cut the packaging board according to the structure of the packaging box to form the wall or the board containing the wall.

[0060] Stamping and cutting are used to simultaneously process openwork windows, annular grooves, and supporting steps on the wall.

[0061] Transparent layer preparation: The transparent layer is prefabricated according to the cut-out window.

[0062] The bonding and bonding process involves applying a hot melt adhesive layer to the supporting and locking part, aligning the transparent layer with the perforated window, and then performing hot molding bonding.

[0063] Molding involves preparing the molded structural walls into a packaging box with a transparent, isolated display area.

[0064] This method relies on the material characteristics of the solid-pressure packaging board and the transparent plastic board, and adopts a step-by-step molding and integrated composite process to achieve high-precision and high-efficiency processing of the transparent display area of ​​the packaging box, ensuring product structural stability and a flush appearance.

[0065] First, according to the overall cutting drawing of the packaging box, the solid packaging board is precisely cut to obtain individual constituent boards or overall box pieces with constituent walls. Controlling the cutting size accuracy lays the foundation for subsequent stamping and assembly processes.

[0066] Subsequently, the punching and pressing processes are completed simultaneously using a stamping die. Hollowed-out windows, annular grooves, and supporting steps are machined in one go at the preset positions of the constituent wall to ensure the coaxiality and positional uniformity of each structure, avoid dimensional deviations caused by multiple processing steps, and at the same time ensure the integrated structural strength of the supporting locking part and the constituent wall, and prevent edge delamination and chipping.

[0067] Next, based on the outline dimensions of the cut-out window, a matching transparent layer blank is prefabricated to ensure that the transparent area fits the window shape and leaves a machining allowance for the outer perimeter composite edge, which is convenient for direct processing or subsequent hot molding and bending structure.

[0068] In the bonding and bonding stage, hot melt adhesive is first evenly applied to the support steps and annular groove area of ​​the supporting and locking part. After the transparent layer and the hollow window are precisely aligned, they are placed into the hot press mold. The hot melt adhesive is melted and leveled by controlling the temperature and pressure, fully filling the gaps without air bubbles. The outer circumference is bent and embedded into the annular groove to form a locking mechanism.

[0069] Finally, the composite walls are bent and assembled according to the overall structure of the packaging box to form a complete packaging box with a transparent isolation display area. The entire process is tightly connected and has strong processing consistency, which not only improves production efficiency, but also ensures that the product is firmly assembled and has a neat appearance.

[0070] In one specific embodiment, the outer peripheral bend is formed during hot molding.

[0071] In the thermoforming process, the directional pressure and heating of the mold, combined with the thermoplastic softening properties of the transparent plastic sheet, allow for the simultaneous bending and pressing of the outer edge of the transparent layer corresponding to the annular groove while adhering to the supporting and locking parts. This on-site molding of the outer circumferential bend edge and its embedding into the groove eliminates the need for pre-fabrication of the bending structure. This reduces individual processing steps, ensures a complete fit between the outer circumferential bend edge and the annular groove without gaps or misalignment, and simultaneously melts and cures the hot melt adhesive, resulting in a tight bond between the bent area and the groove. This further enhances the assembly strength of the transparent layer and ensures a flush overall surface.

[0072] Additionally, refer to Figure 5 As shown, the process includes mounting steps, which involves first bonding the transparent layer and then mounting the decorative surface layer 8. First, the transparent layer and the constituent wall are hot-molded together to ensure that the transparent layer is firmly assembled and the hot melt adhesive is completely cured. Then, the decorative surface layer 8 is mounted on the outer surface of the constituent wall. The decorative surface layer 8 has a through-avoidance area corresponding to the hollowed-out window area. The inner edge of the avoidance area can slightly cover the outer perimeter of the transparent layer to achieve partial shading of the outer perimeter of the transparent layer.

[0073] This structural design not only completely covers the bonding area between the transparent layer and the supporting locking part, eliminating appearance defects caused by hot melt adhesive residue and overflow, and ensuring a clean and beautiful edge of the display area; it also ensures that the decorative surface layer 8 is flush and smooth with the outer surface of the transparent layer through precise size control, without steps or curling edges, while avoiding problems such as burns, delamination, and wrinkles caused by high temperature during hot molding of the decorative surface layer, thus taking into account appearance texture, assembly precision, and finished product stability.

[0074] As described above, the integrated punching and pressing with a locking structure ensures a secure assembly of the transparent layer, preventing warping, detachment, or displacement. The hot-molding composite, combined with hot melt adhesive leveling, results in bubble-free and adhesive-free bonding, producing a smooth and aesthetically pleasing appearance. The supporting steps and decorative coating serve multiple functions, including positioning, decoration, and adhesive masking, offering high processing precision and a strong visual appeal. The structural and thickness parameters are optimized for solid-press sheet metal processing, ensuring reliable strength and high processing efficiency.

[0075] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0076] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A packaging box with a transparent, isolated display area, comprising a box body and a transparent layer, wherein the box body is formed from a solid-pressure packaging board; characterized in that: At least one of the constituent walls of the box body is provided with a perforated window for mounting the transparent layer. A supporting and locking part is integrally pressed around the outer periphery of the perforated window. The supporting and locking part includes an annular groove and a supporting step. The annular groove is located on the side of the supporting step away from the perforated window and faces the outside of the box body. The transparent layer includes a transparent area that conforms to the shape of the openwork window. The outer periphery of the transparent area is provided with a composite outer edge. The composite outer edge includes an fitting edge for fitting with the supporting step and an outer peripheral bent edge for embedding into the annular groove. The composite outer edge is bonded to the supporting and locking part.

2. The packaging box with a transparent isolated display area according to claim 1, characterized in that: The perforated window and the supporting locking part are integrally punched and pressed.

3. The packaging box with a transparent, isolated display area according to claim 1, characterized in that: The supporting and locking part is provided with a hot melt adhesive layer, and the composite outer edge is hot-molded and composited with the supporting and locking part.

4. The packaging box with a transparent isolated display area according to claim 3, characterized in that: The outer peripheral bending edge is a hot-molded structure.

5. The packaging box with a transparent, isolated display area according to claim 1, characterized in that: The side wall of the supporting step facing the hollowed-out window has a chamfered arc surface, and the supporting step has a decorative coating to create a metallic reflective effect.

6. The packaging box with a transparent isolated display area according to claim 1, characterized in that: The wall of the box body, which has the perforated window, is flush with the surface of the corresponding transparent layer.

7. The packaging box with a transparent isolated display area according to claim 6, characterized in that: The box body is equipped with a decorative surface layer on the wall of the hollowed-out window. The decorative surface layer has a through-avoidance area that is aligned with the outer peripheral bending edge. The decorative surface layer is flush with the surface of the transparent layer.

8. The packaging box with a transparent isolated display area according to any one of claims 1 to 7, characterized in that: The depth of the annular groove is less than or equal to 1 / 2 of the thickness of the constituent wall; The thickness of the wall is 1.5mm to 3.5mm; The transparent layer is a transparent plastic sheet, and the thickness of the transparent layer is 0.3mm to 1.1mm.

9. A method for forming a packaging box, used for forming the packaging box according to any one of claims 1 to 7, characterized in that... Includes the following steps: S1 cutting: Cut the packaging board according to the structure of the packaging box to form a board that forms the wall or contains the wall. S2 stamping and cutting simultaneously processes hollow windows, annular grooves, and supporting steps on the constituent walls; S3 transparent layer preparation: Pre-fabricate the corresponding transparent layer according to the hollowed-out window; S4 bonding composite: A hot melt adhesive layer is set on the supporting and locking part, and the transparent layer and the hollow window are aligned and then hot molded composite is performed. S5 molding processes the formed structural walls into a packaging box with a transparent, isolated display area.

10. The packaging box with a transparent isolated display area according to claim 9, characterized in that: In step S4, the outer peripheral bend is formed during hot molding composite.

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