Stacked POF heat shrink film package for sheet products
By incorporating rounded corners and perforated structures into the heat shrink film, secure packaging of sheet products is achieved, solving the problem of sharp edges on the heat shrink film, enhancing the stability and security of the packaging, and facilitating stacking and hanging.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KUNSHAN HENGJIEYUAN PACKAGE MATERIAL CO LTD
- Filing Date
- 2025-09-23
- Publication Date
- 2026-05-19
AI Technical Summary
The existing heat shrink film, after wrapping thin sheet products, has thin and sharp edges that can easily scratch handling personnel and consumers, and the packaging structure is not stable enough.
A stacked POF heat shrink film packaging is designed. By setting the outer rounded corners at the raised edge of the heat shrink film, the molten material of adjacent heat shrink films can flow through the inner wall of the perforation and bond with the perforation using perforations and adhesive parts, forming a multi-layer three-dimensional bond, which enhances the structural stability and is further reinforced during heat bonding.
It effectively improves the safety of heat shrink film edges, reduces the risk of scratches, enhances the stability and anti-loosening ability of packaging, facilitates stacking and hanging, and improves usage safety and packaging efficiency.
Smart Images
Figure CN224257311U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat shrink film, specifically to a stacked POF heat shrink film packaging for sheet products. Background Technology
[0002] POF, or heat shrink film, is a multilayer co-extruded polyolefin heat shrink film. It is made by extruding linear low-density polyethylene as the middle layer and copolymer polypropylene as the inner and outer layers using three extruders, followed by die forming and bubble inflation. Heat shrink film is a thermoplastic film that tightly wraps around a product after shrinking when heated.
[0003] Heat shrink film can also be used to wrap thin products with sharp edges. However, compared to wrapping boxes or bottles with heat shrink film, the edges of thin products wrapped with heat shrink film are still relatively thin and sharp. The edges of the heat-shrinked and hardened film may also scratch personnel and consumers. Utility Model Content
[0004] The problem to be solved by this utility model is to provide a stacked POF heat shrink film packaging for sheet products.
[0005] To solve the above problems, this utility model provides a stacked POF heat shrink film packaging for sheet products. To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problems is as follows:
[0006] A stacked POF heat shrink film packaging for sheet products includes: openings at both ends of the heat shrink film, allowing the sheet product to enter; perforations, where the heat shrink film wraps around the sheet product after being heated and shrinks, forming a raised edge around the sheet product composed of two layers of film; several heat shrink films wrapped with sheet products are stacked together, and several perforations are punched in their respective raised edges; an adhesive section, where several heat shrink films wrapped with sheet products are stacked together, and a portion of their respective raised edges are bonded together by heat pressing; and rounded corners, where rounded corners are formed at the top corners of the raised edges; wherein all perforations are located within the adhesive section, and the molten heat shrink film material in the adhesive section flows through the inner wall of the perforations and bonds the several heat shrink films together.
[0007] As a further improvement of this utility model, the protruding edge is divided into a first protruding edge and a second protruding edge according to different widths. The width of the first protruding edge is smaller than the width of the second protruding edge, and the adhesive part is located on the second protruding edge.
[0008] As a further improvement of this utility model, the punching includes a first punch and a second punch, the inner diameter of the first punch is larger than the inner diameter of the second punch, the number of second punches is greater than the number of first punches, and the first punch can pass through the hook.
[0009] As a further improvement of this utility model, the first punch is located on the same side of all the second punches.
[0010] As a further improvement of this utility model, the width of the adhesive portion is smaller than the width of the second protruding edge.
[0011] As a further improvement of this utility model, a number of second punches are arranged in a rectangular array at the adhesive part, and the inner diameter of the second punches is less than 2mm.
[0012] As a further improvement of this utility model, the number of heat-shrink films wrapped around the sheet product and stacked on top of each other does not exceed six.
[0013] As a further improvement of this utility model, the thickness of the heat shrink film is one of 12μm, 15μm, 20μm, 25μm, 30μm, and 37μm.
[0014] The beneficial technical effects of using the stacked POF heat shrink film packaging for sheet products according to this application are:
[0015] First, by forming an outer rounded corner at the top of the raised edge, the problem of thin and sharp edges in traditional thin sheet heat shrink film packaging is effectively improved, reducing the risk of scratches to handling personnel and consumers, and improving safety in use.
[0016] Secondly, high-temperature heat sealing allows adjacent layers of heat-shrinkable film to be bonded together piece by piece. During the heat sealing process, some molten heat-shrinkable film material flows through the inner wall of the perforation and then solidifies. This further strengthens the bond by connecting the material within the perforation, enhancing the adhesion strength between the stacked heat-shrinkable films and preventing the stacked structure from loosening.
[0017] Finally, the openings at both ends of the heat-shrink film allow for quick insertion of sheet products. The two layers of film formed after heat shrinking protect the sharp edges of the sheet products while also providing a larger overall surface area for easier stacking. Several packaged sheet products can then be circulated or sold together. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the first processing stage of one embodiment of the present invention;
[0020] Figure 2This is a schematic diagram of the second processing stage of one embodiment of the present invention;
[0021] Figure 3 This is a schematic diagram of the third processing stage of one embodiment of the present invention;
[0022] Figure 4 This is a schematic diagram of the fourth processing stage in one embodiment of this utility model.
[0023] 1-Sheet product; 2-Heat shrink film; 201-Opening; 202-First raised edge; 203-Second raised edge; 3-Heat-pressing area; 4-Adhesive part; 5-Gap; 6-First punch; 7-Outer rounded corner; 8-Second punch. Detailed Implementation
[0024] The present invention will be further described in detail below with reference to specific embodiments:
[0025] To achieve the purpose of this utility model, a stacked POF heat shrink film packaging for sheet products is provided, such as... Figure 4 As shown on the far right, it includes: openings 201, with openings 201 at both ends of the heat shrink film 2, allowing the sheet product 1 to enter; perforations, where the heat shrink film 2 wraps around the sheet product 1 after being heated and shrinks, forming a raised edge around the sheet product 1 formed by two layers of film; several heat shrink films 2 wrapped with the sheet product 1 are stacked on each other, and several perforations are punched in their respective raised edges; adhesive portion 4, where several heat shrink films 2 wrapped with the sheet product 1 are stacked on each other, and the portions of their respective raised edges are bonded together by heat; outer rounded corner 7, an outer rounded corner 7 is formed at the top corner of the raised edge; wherein, all the perforations are located in the adhesive portion 4, and the molten heat shrink film 2 material of the adhesive portion 4 flows through the inner wall of the perforations and bonds several heat shrink films 2 together.
[0026] Figures 1 to 4 Two different texture fillers are used to represent the sheet product 1 and the adhesive part 4. The adhesive part 4 is bonded together along the thickness direction. The outer walls of adjacent heat shrink films 2 are bonded together due to heat, and a small part of the heat shrink film 2 melts and flows into the perforation, thus bonding the different layers of heat shrink film 2 together from another perspective, improving the mutual adhesion effect.
[0027] Additionally, the illustrated sheet product 1 has a rectangular shape. For example... Figure 1 As shown, the heat-shrinkable film 2 in its unheated state is an axially continuous tubular shape. After heat shrinking, a single heat-shrinkable film 2 becomes a double-layer film structure.
[0028] Figure 4 The far right, that is Figure 4 The middle arrow points to the final product state.
[0029] Figure 1 The arrows indicate the installation direction of the sheet product 1 and the heat shrink film 2. Figure 2 , Figure 3 , Figure 4 The arrows in the diagram represent the direction of change. Figure 2 , Figure 3 , Figure 4 They change sequentially, representing different processing stages. Additionally, Figure 2 Taking four stacked together as an example, the actual number can be determined according to specific needs.
[0030] Figure 1 It involves the packaging and heat shrinking of a single heat-shrink film 2 and a single sheet product 1. Figure 2 It is a stack and punching of multiple packaged sheet products 1. Figure 3 Is to continue in Figure 2 On the basis of hot scalding, Figure 4 Is Figure 3 Based on this, trim the edges, that is, trim the outer corner radius 7.
[0031] The beneficial effects of adopting the above technical solution are as follows: By setting an outer rounded corner 7 at the top corner of the convex edge, the sharp edges and corners of traditional sheet packaging are eliminated, reducing the risk of personnel scratches. The molten material inside the adhesive section 4 flows through the inner wall of the perforation and solidifies, achieving multi-layer three-dimensional bonding of adjacent heat-shrink films 2, significantly improving the integrity and anti-loosening ability of the stacked structure. This provides a reinforced bonding method based on the bonding of adjacent layers of heat-shrink film 2. Finally, several packaged sheet products can be circulated or sold together, or sold by hooking them through the perforations.
[0032] In some other embodiments of this utility model, the protruding edge is divided into a first protruding edge 202 and a second protruding edge 203 according to different widths. The width of the first protruding edge 202 is smaller than the width of the second protruding edge 203, and the adhesive part 4 is located on the second protruding edge. The adhesive part 4 is the heat-pressing area 3.
[0033] like Figure 1 As shown, the number of first convex edges 202 is three, and the number of second convex edges 203 is one.
[0034] The beneficial effects of adopting the above technical solution are: dividing the convex edge into a first convex edge 202 and a second convex edge 203 according to the width, and limiting the adhesive part 4 on the wider second convex edge 203, which not only ensures sufficient bonding area, but also avoids the hot-burning operation from interfering with the main protective area of the sheet product 1, thus taking into account both bonding strength and product safety.
[0035] like Figure 2 As shown, in some other embodiments of this utility model, the punching includes a first punch 6 and a second punch 8. The inner diameter of the first punch 6 is larger than the inner diameter of the second punch 8. The number of second punches 8 is greater than the number of first punches 6. The first punch 6 can pass through the hook.
[0036] In addition, the center of the first punch 6 coincides with the center of the adjacent outer rounded corner 7.
[0037] The beneficial effects of adopting the above technical solution are as follows: by setting the first punch 6 and the second punch 8 with different inner diameters, the large-diameter first punch 6 is adapted to the hook suspension function. The small-diameter second punch 8 is densely distributed to increase the flow channel of molten material, strengthen the mechanical interlocking between layers, and simultaneously achieve the dual requirements of convenient suspension and adhesive reinforcement.
[0038] In some other embodiments of this invention, the first punch 6 is located on the same side of all the second punches 8.
[0039] The beneficial effect of adopting the above technical solution is that the first punch 6 is located on the same side of all the second punches 8, ensuring that the hook suspension point is located in one corner.
[0040] In some other embodiments of this invention, the width of the adhesive portion 4 is smaller than the width of the second protruding edge 203.
[0041] The beneficial effects of adopting the above technical solution are: the design that the width of the adhesive part 4 is smaller than the width of the second convex edge 203 provides a buffer boundary for hot melting, prevents material overflow and contamination of the thin sheet product 1, and ensures that the adhesive area is fully heated, avoiding weak edge adhesion.
[0042] In some other embodiments of this utility model, a plurality of second punches 8 are arranged in a rectangular array in the adhesive part 4, and the inner diameter of the second punches 8 is less than 2 mm.
[0043] The molten heat-shrinkable film 2 can fill the inner cavity of the second punch 8.
[0044] The beneficial effects of adopting the above technical solution are: the second perforation 8 is arranged in a rectangular array on the adhesive part 4, and the inner diameter is less than 2 mm, so that the molten material can fully fill the cavity and be evenly distributed, forming dense micro-anchoring points, which significantly enhances the bonding uniformity and peel strength.
[0045] In some other embodiments of this invention, the number of heat-shrink films 2 wrapped around the sheet product 1 and stacked on top of each other does not exceed six. For example... Figure 2 As shown, the quantity of heat shrink film 2 and sheet product 1 is four.
[0046] The beneficial effects of adopting the above technical solution are: limiting the number of stacked layers to no more than six layers, balancing packaging efficiency and structural stability, avoiding adhesion failure or damage to the thin sheet product 1 due to excessive pressure on the bottom layer, and avoiding the situation where heat is applied but not fully penetrated.
[0047] In some other embodiments of this utility model, the thickness of the heat-shrinkable film 2 is one of 12μm, 15μm, 20μm, 25μm, 30μm, and 37μm.
[0048] The beneficial effects of adopting the above technical solution are: the thickness of the heat shrink film 2 is limited to the standard specification between 12μm and 37μm, which can meet the protection requirements of thin sheet products 1 of different sizes while satisfying the mechanical strength and shrinkage performance.
[0049] In other embodiments, the thickness of the adhesive portion 4 is relatively thin because the heat shrink film 2 will be appropriately flattened when it is heat-bonded and pressed. The sum of the thicknesses of the adhesive portions 4 of several heat shrink films 2 is 75% to 85% of the sum of the thicknesses of several heat shrink films 2.
[0050] Where the heat shrink films 2 are stacked but not bonded together, gaps 5 are formed between adjacent heat shrink films 2.
[0051] In other embodiments, the radius corresponding to the outer fillet 7 is greater than the inner diameter corresponding to the first punch 6.
[0052] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.
Claims
1. A stacked POF heat shrink film packaging for sheet products, characterized in that, include: The heat shrink film has openings at both ends, which allow the sheet product to enter; The heat shrink film, after being heated and shrunk, wraps around the sheet product and forms a raised edge around the sheet product, which is formed by two layers of film. Several heat shrink films wrapped around the sheet product are stacked on each other, and several holes are punched in their respective raised edges. In the adhesive section, several heat-shrink films wrapped with thin sheet products are stacked together, and the protruding parts of their respective edges are bonded together by heat pressing. The outer rounded corner is formed at the apex of the convex edge; All the punches are located within the adhesive section, where the molten heat-shrinkable film material flows through the inner wall of the punches and bonds several heat-shrinkable films together.
2. The stacked POF heat shrink film packaging for sheet products according to claim 1, characterized in that: The protruding edge is divided into a first protruding edge and a second protruding edge according to different widths. The width of the first protruding edge is smaller than the width of the second protruding edge, and the adhesive part is located on the second protruding edge.
3. The stacked POF heat shrink film packaging for sheet products according to claim 1, characterized in that: The punching includes a first punch and a second punch. The inner diameter of the first punch is larger than the inner diameter of the second punch. The number of second punches is greater than the number of first punches. The first punch can pass through the hook.
4. The stacked POF heat shrink film packaging for sheet products according to claim 3, characterized in that: The first punch is located on the same side of all the second punches.
5. The stacked POF heat shrink film packaging for sheet products according to claim 2, characterized in that: The width of the adhesive portion is less than the width of the second protrusion.
6. The stacked POF heat shrink film packaging for sheet products according to claim 3, characterized in that: Several second punches are arranged in a rectangular array at the bonding part, and the inner diameter of the second punches is less than 2 mm.
7. The stacked POF heat shrink film packaging for sheet products according to claim 1, characterized in that: The number of heat-shrink films wrapped around sheet products and stacked on top of each other shall not exceed six.
8. The stacked POF heat shrink film packaging for sheet products according to claim 1, characterized in that: The thickness of the heat-shrinkable film is one of 12μm, 15μm, 20μm, 25μm, 30μm, and 37μm.