PE heat shrinkable composite film structure

Abstract

The utility model relates to a kind of PE heat shrinkage composite film structure.It solves the problem of the surface printing pattern of heat shrinkage film in prior art is not wear-resistant and the heat insulation is not good.It includes outer PE film and inner PE film, polyurethane connecting layer structure is arranged between outer PE film and inner PE film, polyurethane connecting layer structure, outer PE film and inner PE film are provided with crimping type stretch shrinkage component in circumferential two sides, outer PE film and inner PE film are respectively provided with outer corona layer and inner corona layer on the side close to polyurethane connecting layer.The utility model has the advantages of good heat insulation performance and scratch-resistant wear-resistant, and the surface energy is increased by corona treatment, so that the adhesive layer of film material and polyurethane connecting layer is tightly combined, while the ink adhesion of inner printing layer is facilitated, to ensure that printing pattern is clear and not easy to fall off.

Description

Technical Field

[0001] This utility model relates to the field of packaging film technology, specifically to a PE heat-shrinkable composite film structure. Background Technology

[0002] Heat shrink film is widely used for shrink labels on beverage bottles, daily necessities, cosmetics, electronic products, and other containers with complex shapes. However, the conjugation of benzene rings and ester groups in its molecular chain makes the heat shrink film less flexible, resulting in a hard and brittle film after shrinkage. The shrinkage force of heat shrink film is relatively large. Furthermore, with the trend towards thinner and more specialized packaging bottles, there are problems such as deformation caused by the heat shrink film squeezing the packaged items, low overall stiffness, poor aging resistance, and easy delamination. In addition, the printed patterns on the surface of existing heat shrink films are not wear-resistant and are prone to fading, and their heat insulation performance is poor.

[0003] To address the shortcomings of existing technologies, people have conducted long-term research and proposed various solutions. For example, Chinese patent literature discloses a high-barrier sheet [CN202323255328.1], which includes a core support layer, a microporous membrane layer, and an aging-resistant layer. The outer surfaces of both sides of the core support layer are bonded with microporous membrane layers, which are PETG microporous membranes. The outer surfaces of the microporous membrane layers are bonded with aging-resistant layers. The core support layer includes PS polyester chip layers, and PETG polyester chip layers are co-extruded on both sides of the outer surfaces of the PS polyester chip layers. The inner surfaces of the microporous membrane layers are bonded to the PETG polyester chip layers. The aging-resistant layer includes a PETG film, and the outer surfaces of the PETG film are bonded with UV-resistant transparent films. The PETG films are bonded to the outer surfaces of the microporous membrane layers.

[0004] The above solution has solved to some extent the problems of heat shrink film causing packaging items to deform and having poor aging resistance in the existing technology. However, the solution still has many shortcomings, such as: the printed patterns on the surface of the heat shrink film are not wear-resistant and are easy to fade, and the heat insulation performance is poor. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a PE heat-shrinkable composite film structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a PE heat-shrinkable composite film structure, comprising an outer PE film and an inner PE film, wherein a polyurethane connecting layer structure is provided between the outer PE film and the inner PE film, and a press-fit stretching and shrinking assembly is provided on both circumferential sides of the polyurethane connecting layer structure, the outer PE film and the inner PE film, and an outer corona layer and an inner corona layer are respectively provided on the side of the outer PE film and the inner PE film near the polyurethane connecting layer.

[0007] In the above-mentioned PE heat-shrinkable composite film structure, the outer PE film includes a PE co-extruded outer film, the outer wall of the PE co-extruded outer film is provided with a scratch-resistant and wear-resistant layer, and the inner wall of the PE co-extruded outer film is connected to the above-mentioned outer corona layer through an outer heat insulation layer.

[0008] In the above-mentioned PE heat-shrinkable composite film structure, the inner PE film includes a PE co-extruded inner film, an inner heat insulation layer is provided on the inner wall surface of the PE co-extruded inner film, and a printing layer is provided between the inner heat insulation layer and the aforementioned inner corona layer.

[0009] In the above-mentioned PE heat-shrinkable composite film structure, a heat-resistant layer is provided on the outer wall surface of the PE co-extruded inner film.

[0010] In the aforementioned PE heat-shrinkable composite film structure, the polyurethane connecting layer structure includes a polyurethane main layer, with adhesive layers on both sides of the polyurethane main layer, and the adhesive layers are respectively connected to the corresponding outer corona layer and inner corona layer.

[0011] In the above-mentioned PE heat-shrinkable composite film structure, a heat-insulating cavity is provided between the adhesive layer and the polyurethane main layer.

[0012] In the aforementioned PE heat-shrinkable composite film structure, a number of equally spaced filling cavities are penetrated through the polyurethane main layer, and the filling cavities are filled with heat-insulating fluid material.

[0013] In the above-mentioned PE heat shrink composite film structure, the press-fit stretch shrinkage assembly includes a positioning frame, with insertion connection parts provided at the upper and lower ends of one side of the positioning frame, and connection slots corresponding to the insertion connection parts provided at the edges of the outer PE film and the inner PE film.

[0014] In the above-mentioned PE heat shrinkable composite film structure, a flexible stretching strip is inserted through the middle of the positioning frame, the end of the flexible stretching strip passes through the positioning frame and is positioned by a ring handle plate, and the middle of the flexible stretching strip is inserted into the polyurethane main layer, and the polyurethane main layer is provided with a stretching and shrinking channel through which the flexible stretching strip can pass.

[0015] In the above-mentioned PE heat-shrinkable composite film structure, several pressure-resistant protrusions are respectively provided on the upper and lower sides of the polyurethane main layer, and the above-mentioned heat insulation cavity is formed between two adjacent pressure-resistant protrusions.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] 1. The outer wall of the PE co-extruded outer film is equipped with a scratch-resistant and wear-resistant layer, which can effectively resist friction damage during transportation and storage, extend the service life of the film, and is suitable for packaging scenarios in rough environments.

[0018] 2. The outer PE film is bonded to the outer heat insulation layer, the outer corona layer and the polyurethane connecting layer, and the inner PE film is bonded to the inner heat insulation layer, the printing layer, the inner corona layer and the polyurethane connecting layer. The multi-layer composite structure improves the tensile and tear resistance of the film material and avoids cracking during shrinkage.

[0019] 3. The pressure-resistant protrusions of the polyurethane main layer enhance the structural pressure resistance and prevent the membrane material from deforming under pressure; the heat insulation cavities formed by adjacent protrusions, together with the heat insulation fluid material, construct multiple heat insulation barriers and improve the heat insulation effect.

[0020] 4. The outer corona layer of the outer PE film and the inner corona layer of the inner PE film are treated with corona to increase surface energy, which makes the film material and the polyurethane bonding layer adhere tightly. At the same time, it facilitates the adhesion of ink in the inner printing layer, ensuring that the printed pattern is clear and not easy to fall off.

[0021] 5. The circumferentially pressed stretch shrink assembly achieves rapid positioning and assembly of the outer and inner film materials through the cooperation of the positioning frame, plug-in connector and connecting slot, avoiding film material displacement during shrinkage. The stretching force can be manually adjusted through the ring handle plate, so that the film material is subjected to uniform force during heat shrinkage, closely fits the contour of the item, and improves the packaging aesthetics and sealing performance. Attached Figure Description

[0022] Figure 1 This is an exploded view of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the PE co-extruded outer film structure in this utility model;

[0024] Figure 3 This is a schematic diagram of the PE co-extruded inner film structure in this utility model;

[0025] Figure 4 This is a schematic diagram of the polyurethane main layer structure in this utility model;

[0026] Figure 5 This is a schematic diagram of the press-fit stretch-shrink assembly structure in this utility model;

[0027] In the diagram: outer PE film 1, outer corona layer 11, PE co-extruded outer film 12, scratch-resistant and wear-resistant layer 13, outer heat insulation layer 14, inner PE film 2, inner corona layer 21, PE co-extruded inner film 22, inner heat insulation layer 23, printing layer 24, heat-resistant layer 25, polyurethane connecting layer structure 3, polyurethane main layer 31, adhesive layer 32, heat insulation cavity 33, filling cavity 34, pressure-resistant protrusion 35, press-fit stretch shrinkage assembly 4, positioning frame 41, plug-in connection part 42, connecting slot 43, flexible stretch band 44, annular handle plate 45, stretch shrinkage channel 46. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1-5 As shown, a PE heat-shrinkable composite film structure includes an outer PE film 1 and an inner PE film 2. A polyurethane connecting layer structure 3 is provided between the outer PE film 1 and the inner PE film 2. A press-fitted stretch shrinkage assembly 4 is provided on both sides of the polyurethane connecting layer structure 3, the outer PE film 1 and the inner PE film 2. An outer corona layer 11 and an inner corona layer 21 are respectively provided on the side of the outer PE film 1 and the inner PE film 2 near the polyurethane connecting layer.

[0030] The outer PE film 1 includes a PE co-extruded outer film 12, the outer wall of the PE co-extruded outer film 12 is provided with a scratch-resistant and wear-resistant layer 13, and the inner wall of the PE co-extruded outer film 12 is connected to the aforementioned outer corona layer 11 through an outer heat insulation layer 14.

[0031] By setting the scratch-resistant and abrasion-resistant layer 13, the abrasion resistance of the outer surface of the outer PE film 1 is improved, the damage caused by external friction and scratches is reduced, and the protective effect is improved.

[0032] The outer insulation layer 14 reduces the transfer of external heat to the inner layer by blocking the heat conduction path, while enhancing the toughness of the outer layer structure.

[0033] As can be seen, the inner PE film 2 includes a PE co-extruded inner film 22, an inner heat insulation layer 23 is provided on the inner wall surface of the PE co-extruded inner film 22, and a printing layer 24 is provided between the inner heat insulation layer 23 and the aforementioned inner corona layer 21.

[0034] The inner corona layer 21 enhances ink adhesion, enabling the printing of markings and information, while the inner heat insulation layer 23 prevents ink from fading or peeling off due to temperature changes.

[0035] Obviously, a heat-resistant layer 25 is provided on the outer wall surface of the PE co-extruded inner film 22.

[0036] The heat-resistant layer 25 is used to prevent the inner membrane from softening and deforming, ensuring shrinkage accuracy.

[0037] Furthermore, the polyurethane connecting layer structure 3 includes a polyurethane main layer 31, and adhesive layers 32 are provided on both sides of the polyurethane main layer 31. The adhesive layers 32 are respectively connected to the corresponding outer corona layer 11 and inner corona layer 21.

[0038] The adhesive layer 32 forms a chemical bond with the active surfaces of the outer corona layer 11 and the inner corona layer 21 through polyurethane adhesive or hot melt adhesive, thereby achieving a high-strength connection between the inner and outer membrane materials and improving structural stability.

[0039] Furthermore, a heat-insulating cavity 33 is provided between the adhesive layer 32 and the polyurethane main body layer 31.

[0040] Preferably, the upper and lower sides of the polyurethane main layer 31 are provided with a plurality of pressure-resistant protrusions 35 that are staggered with each other, and the above-mentioned heat-insulating cavity 33 is formed between two adjacent pressure-resistant protrusions 35.

[0041] The thermal insulation cavity 33 utilizes the low thermal conductivity of air to form a thermal insulation barrier; at the same time, the pressure-resistant protrusions 35 on the upper and lower sides of the polyurethane main body layer 31 are staggered to further divide the air layer and enhance the thermal insulation effect. In addition, the pressure-resistant protrusions 35 improve the pressure resistance.

[0042] Specifically, a number of equally spaced filling cavities 34 are penetrated through the polyurethane main layer 31, and the filling cavities 34 are filled with heat-insulating fluid material.

[0043] The thermal insulation fluid material is silicone or mineral oil. Through the low thermal conductivity and heat capacity of the thermal insulation fluid material, it absorbs and blocks heat conduction, forming a dynamic thermal insulation layer, thereby improving the thermal insulation performance.

[0044] More specifically, the press-fit stretch-shrink assembly 4 includes a positioning frame 41, with insertion connection parts 42 respectively provided at the upper and lower ends of one side of the positioning frame 41, and connection slots 43 corresponding to the insertion connection parts 42 provided at the edges of the outer PE film 1 and the inner PE film 2.

[0045] The membrane material is circumferentially positioned by mechanical clamping to ensure positional accuracy before heat shrinking and avoid displacement.

[0046] In detail, a flexible tension band 44 is inserted through the middle of the positioning frame 41. The end of the flexible tension band 44 passes through the positioning frame 41 and is positioned by the annular handle plate 45. The middle of the flexible tension band 44 is inserted into the polyurethane main body layer 31. The polyurethane main body layer 31 is provided with a stretching and contraction channel 46 through which the flexible tension band 44 can pass.

[0047] When the ring handle is manually pulled 45 degrees, the tension belt applies uniform tension to the membrane material, causing the membrane material to shrink along the preset direction during the heat shrinkage process and conform to the outline of the item.

[0048] In summary, the principle of this embodiment is as follows: by sequentially setting an outer heat insulation layer 14, a heat insulation cavity 33, a filling cavity 34, an inner heat insulation layer 23, and a heat-resistant layer 25 from the outside to the inside to form a multi-layer heat insulation network, combined with an air layer and fluid materials, heat insulation between the inside and outside of the packaging is achieved, thereby improving the heat insulation performance; secondly, the inner corona layer 21 is used to enhance the ink adhesion, enabling the printing of markings and information, and the inner heat insulation layer prevents the ink from fading or falling off due to temperature changes, and the mechanical adjustment of the press-fit stretch shrinkage assembly 4 ensures that the film material deforms uniformly during heat shrinkage.

[0049] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0050] Although this document frequently uses terms such as outer PE film 1, outer corona layer 11, PE co-extruded outer film 12, scratch-resistant and wear-resistant layer 13, outer heat insulation layer 14, inner PE film 2, inner corona layer 21, PE co-extruded inner film 22, inner heat insulation layer 23, printing layer 24, heat-resistant layer 25, polyurethane connecting layer structure 3, polyurethane main layer 31, adhesive layer 32, heat insulation cavity 33, filling cavity 34, pressure-resistant protrusion 35, press-fit stretch-shrink assembly 4, positioning frame 41, plug-in connection part 42, connecting slot 43, flexible stretch band 44, annular handle plate 45, and stretch-shrink channel 46, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A PE heat-shrinkable composite film structure, comprising an outer PE film (1) and an inner PE film (2), characterized in that, A polyurethane connecting layer structure (3) is provided between the outer PE film (1) and the inner PE film (2). The polyurethane connecting layer structure (3), the outer PE film (1) and the inner PE film (2) are provided with a press-fit stretch shrinkage assembly (4) on both sides of the circumference. An outer corona layer (11) and an inner corona layer (21) are respectively provided on the side of the outer PE film (1) and the inner PE film (2) near the polyurethane connecting layer.

2. The PE heat-shrinkable composite film structure according to claim 1, characterized in that, The outer PE film (1) includes a PE co-extruded outer film (12), and the outer wall of the PE co-extruded outer film (12) is provided with a scratch-resistant and wear-resistant layer (13). The inner wall of the PE co-extruded outer film (12) is connected to the outer corona layer (11) through an outer heat insulation layer (14).

3. The PE heat-shrinkable composite film structure according to claim 1, characterized in that, The inner PE film (2) includes a PE co-extruded inner film (22), and an inner heat insulation layer (23) is provided on the inner wall surface of the PE co-extruded inner film (22). A printing layer (24) is provided between the inner heat insulation layer (23) and the inner corona layer (21).

4. The PE heat-shrinkable composite film structure according to claim 3, characterized in that, The outer wall surface of the PE co-extruded inner film (22) is provided with a heat-resistant layer (25).

5. The PE heat-shrinkable composite film structure according to claim 1, characterized in that, The polyurethane connecting layer structure (3) includes a polyurethane main layer (31), and adhesive layers (32) are provided on both sides of the polyurethane main layer (31). The adhesive layers (32) are connected to the corresponding outer corona layer (11) and inner corona layer (21) respectively.

6. The PE heat-shrinkable composite film structure according to claim 5, characterized in that, A heat-insulating cavity (33) is provided between the adhesive layer (32) and the polyurethane main layer (31).

7. The PE heat-shrinkable composite film structure according to claim 5, characterized in that, The polyurethane main layer (31) has several equally spaced filling cavities (34) that are filled with heat-insulating fluid material.

8. The PE heat-shrinkable composite film structure according to claim 5, characterized in that, The press-fit stretch shrinkage assembly (4) includes a positioning frame (41), and the upper and lower ends of one side of the positioning frame (41) are respectively provided with plug-in connection parts (42). The outer PE film (1) and the inner PE film (2) are provided with connection slots (43) corresponding to the plug-in connection parts (42) at their edges.

9. The PE heat-shrinkable composite film structure according to claim 8, characterized in that, A flexible stretching band (44) is inserted through the middle of the positioning frame (41). The end of the flexible stretching band (44) passes through the positioning frame (41) and is positioned by the annular handle plate (45). The middle of the flexible stretching band (44) is inserted into the polyurethane main body layer (31). The polyurethane main body layer (31) is provided with a stretching and shrinking channel (46) through which the flexible stretching band (44) can pass.

10. A PE heat-shrinkable composite film structure according to claim 6, characterized in that, The polyurethane main layer (31) has several pressure-resistant protrusions (35) arranged in a staggered manner on its upper and lower sides, and the above-mentioned heat insulation cavity (33) is formed between two adjacent pressure-resistant protrusions (35).

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