A composite film for pharmaceutical packaging having a double sealed edge

Abstract

The utility model discloses a kind of composite films with double sealing edge for medicine packaging, it is related to medicine packaging technical field, including composite film body, the top surface of composite film body is provided with outer layer barrier film, the bottom surface of outer layer barrier film is pasted with function layer, the bottom surface of function layer is pasted with inner layer heat seal layer, the periphery of composite film body is pasted with double sealing edge structure, and double sealing edge includes first main sealing edge and second auxiliary sealing edge;By forming first main sealing edge and second auxiliary sealing edge in composite film edge area synchronously, and setting guide drain groove between the two, when first main sealing edge appears failure due to process fluctuation or use damage, second auxiliary sealing edge can still maintain sealing performance;And guide drain groove can guide residual gas or water vapor to escape in time, avoid that the drum is packed or broken due to internal pressure being too high, thereby greatly reduce medicine leakage risk, guarantee packaging stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of pharmaceutical packaging technology, and in particular to a composite film for pharmaceutical packaging with double sealing edges. Background Technology

[0002] China's pharmaceutical packaging materials industry is an emerging industry. Since the beginning of the new century, its development has accelerated, playing a pivotal role in promoting the development of China's pharmaceutical industry. Pharmaceutical packaging materials are technologically advanced and have strict quality requirements. Before October 2000, my country adopted a licensing system for pharmaceutical packaging materials. Starting in October 2000, the management method was changed to a registration system—certifying and registering each product. The total output value of my country's pharmaceutical packaging industry has accounted for more than 10% of the total output value of the national packaging industry, which is much higher than the proportion of the entire pharmaceutical industry in the total industrial output value of the country. With the emergence of new products and new drugs, the market space of my country's pharmaceutical packaging industry is vast and the prospects are very attractive. However, existing equipment still has problems such as unstable sealing performance, easy leakage, limited barrier performance, simple sealing structure, inability to provide redundant protection, poor environmental protection, and difficulty in recycling. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a composite film for pharmaceutical packaging with double sealing edges, solving the problems mentioned in the background section.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a composite film for pharmaceutical packaging with double sealing edges, comprising a composite film body, an outer barrier film on the top surface of the composite film body, a functional layer attached to the bottom surface of the outer barrier film, an inner heat-sealing layer attached to the bottom surface of the functional layer, and a double sealing edge structure attached to the periphery of the composite film body. The double sealing edge includes a first main sealing edge and a second auxiliary sealing edge. The first main sealing edge is formed by heat-pressing between the inner heat-sealing layer, the intermediate functional layer, and the outer barrier film, providing a primary seal. The second auxiliary sealing edge is located outside the first main sealing edge and is formed by heat-pressing at the edge region between the intermediate functional layer and the outer barrier film, providing redundant sealing protection and enhancing barrier performance. A drainage groove is provided between the first main sealing edge and the second auxiliary sealing edge. The drainage groove guides residual gas or moisture in the sealing area to dissipate along the groove, thereby reducing internal pressure and preventing bulging and rupture.

[0005] As a further technical solution of this utility model, the outer barrier film is made of PET material, and the outer barrier film and the middle functional layer are bonded together by multiple layers of adhesive to improve the barrier performance.

[0006] As a further technical solution of this utility model, the inner heat-sealing layer is made of CPP material and is connected to the intermediate functional layer by hot rolling.

[0007] As a further technical solution of this utility model, the heat sealing width of the first main sealing edge is 3-10mm, the heat sealing width of the second auxiliary sealing edge is 2-5mm, and the center distance between the first main sealing edge and the second auxiliary sealing edge is 1-3mm.

[0008] As a further technical solution of this utility model, the guide groove is linear, and adjusts the stress distribution and pressure relief effect of the sealing edge area with the first main sealing edge and the second auxiliary sealing edge.

[0009] As a further technical solution of this utility model, the second auxiliary sealing edge is formed by multi-point intermittent heat sealing, alternating with the first main sealing edge, which is beneficial to balance redundancy protection and membrane flexibility.

[0010] As a further technical solution of this utility model, the double sealing edge structure is continuously arranged around the perimeter of the composite film, and the first main sealing edge and the second auxiliary sealing edge both form a complete sealing cavity in the edge area.

[0011] As a further technical solution of this utility model, the materials of each layer of the composite film body are combined using an environmentally friendly adhesive process to facilitate the recycling of pharmaceutical packaging.

[0012] This invention provides a composite film for pharmaceutical packaging with double sealing edges, which has the following advantages compared with the prior art:

[0013] 1. This design provides a composite film for pharmaceutical packaging with dual sealing edges. By simultaneously forming a first main sealing edge and a second auxiliary sealing edge in the edge area of ​​the composite film, and setting a drainage groove between them, the second auxiliary sealing edge can still maintain its sealing performance when the first main sealing edge fails due to process fluctuations or wear and tear. The drainage groove can guide residual gas or moisture to escape in time, avoiding excessive internal pressure that could lead to bulging or rupture. This significantly reduces the risk of pharmaceutical leakage and ensures stable and reliable packaging.

[0014] 2. This design presents a composite film for pharmaceutical packaging with double sealing edges. It consists of three layers: an outer barrier film, a middle functional layer, and an inner heat-sealing layer. These layers are tightly bonded together with adhesive, and the middle and inner layers are integrated by hot rolling. This design ensures heat-sealing strength without compromising the multiple interceptions of oxygen, water vapor, and volatile organic compounds, thereby significantly improving the overall barrier effect.

[0015] 3. The composite film for pharmaceutical packaging with double sealing edges designed in this paper can be bonded using existing mature composite adhesive and hot rolling processes through material superposition and bonding. No additional equipment modification is required. The double sealing edges are bonded in one step, eliminating the need for repeated sealing processes, simplifying the manufacturing process, significantly improving production line efficiency and reducing production costs.

[0016] 4. This design provides a composite film for pharmaceutical packaging with double sealing edges. By selecting biodegradable and recyclable thermoplastic materials and using environmentally friendly adhesive processes, the entire film is molded in one piece. After use, it can be recycled as a whole and reused in layers. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of a composite film for pharmaceutical packaging with double sealing edges;

[0018] Figure 2 This is a schematic diagram of the exploded structure of a composite film for pharmaceutical packaging with double sealing edges.

[0019] Figure 3 This is a schematic diagram of the sealing edge structure of a composite film for pharmaceutical packaging with double sealing edges.

[0020] In the diagram: 2. Outer barrier membrane; 3. Middle functional layer; 4. Inner heat-sealing layer; 5. First main sealing edge; 6. Second auxiliary sealing edge. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-3 This utility model provides a technical solution for a composite film for pharmaceutical packaging with double sealing edges:

[0023] like Figure 2 and Figure 3As shown, the membrane includes a composite membrane body. An outer barrier membrane 2 is disposed on the top surface of the composite membrane body, and a functional layer 3 is adhered to the bottom surface of the outer barrier membrane 2. The outer barrier membrane 2 is made of PET film with a thickness of 12–25 μm, providing the main oxygen and water vapor barrier functions. The PET film 2 and the intermediate functional layer 3 are bonded together by multi-point application of a 0.5–1 μm thick environmentally friendly adhesive, followed by light hot rolling (temperature 80–100℃, pressure 0.2 MPa) to complete the initial bonding, ensuring no air bubbles at the interface and a strong adhesion. An inner heat-sealing layer 4 is adhered to the bottom surface of the functional layer 3. The functional layer 3 uses a coating-type high-barrier water-based EVOH. The coating (approximately 3–5 μm thick) enhances the barrier properties against oxygen, nitrogen, and volatile organic compounds. The EVOH coating 3 and the inner heat-sealing layer 4 are compounded together on a hot-rolled co-extrusion mill (temperature 120–130℃, pressure 0.3–0.5 MPa) to ensure uniform interlayer bonding. Simultaneously, the adhesive layer with the outer barrier membrane 2 remains intact. A double-sealing edge structure is adhered to the periphery of the composite membrane body. The double-sealing edge includes a first main sealing edge 5 and a second auxiliary sealing edge 6. The first main sealing edge 5 is formed by hot-pressing between the inner heat-sealing layer 4, the intermediate functional layer 3, and the outer barrier membrane 2, providing primary sealing. The first main sealing edge 5 is formed by hot-pressing at 110–120℃, 0.4–0.5MPa, and a heat-sealing width of 3–10mm. The inner heat-sealing layer 4 is pressed against the edge area of ​​the intermediate functional layer 3 or the outer barrier film 2 to form the main sealing edge. In a high-temperature molten state, the molecular chains interpenetrate and entangle, completing the primary gas seal. It can withstand internal pressures above 0.05MPa without leakage. The second auxiliary sealing edge 6 is located outside the first main sealing edge 5. The second auxiliary sealing edge 6 is formed using a multi-point intermittent hot-pressing or laser pressing process (laser power 5–15W, scanning rate 200–600mm / s or hot-pressing width 2– The intermediate functional layer 3 and the outer barrier film 2 are joined at the edge area to form a second auxiliary sealing edge 6, forming a second sealing line parallel to the main sealing edge. This provides redundant protection when the main sealing edge fails, enhances the barrier performance, and increases the overall sealing safety margin. The second auxiliary sealing edge 6 is formed by hot pressing at the edge area of ​​the intermediate functional layer 3 and the outer barrier film 2 to provide redundant sealing protection and enhance the barrier performance. A drainage groove is provided between the first main sealing edge 5 and the second auxiliary sealing edge 6. The drainage groove is used to guide the residual gas or water vapor in the sealing area to dissipate along the groove to reduce the internal cavity pressure and prevent bulging and rupture.

[0024] like Figure 1 As shown, the outer barrier film 2 is made of PET material, and the outer barrier film 2 and the middle functional layer 3 are bonded together by multiple layers of adhesive to improve barrier performance.

[0025] like Figure 2As shown, the inner heat-sealing layer 4 is made of CPP material and is connected to the intermediate functional layer 3 by hot rolling. A 20μm thick CPP (co-extruded polypropylene) is selected as the fusible bonding surface of the heat-sealing structure to provide primary sealing strength. The CPP layer 4 is directly co-extruded with the intermediate functional layer 3 in the hot rolling process to form an integrated composite structure of inner and middle layers, ensuring that the material can melt uniformly and bond firmly during heat sealing.

[0026] like Figure 2 As shown, the heat-sealing width of the first main sealing edge 5 is 3-10 mm, the heat-sealing width of the second auxiliary sealing edge 6 is 2-5 mm, and the center distance between the first main sealing edge 5 and the second auxiliary sealing edge 6 is 1-3 mm.

[0027] like Figure 3 As shown, the guide groove is linear and works with the first main sealing edge 5 and the second auxiliary sealing edge 6 to adjust the stress distribution and pressure relief effect of the sealing area. The groove width is 0.2–0.5 mm and the groove depth is 20%–30% of the film thickness. The guide groove is formed by indentation roller or laser marking before hot pressing. It works with the two sealing structures to realize the integration of sealing and exhaust channel. When the residual gas or water vapor in the package expands, the guide groove can guide it to overflow along the groove body to avoid high internal pressure from damaging the sealing structure.

[0028] like Figure 3 As shown, the second auxiliary sealing edge 6 is formed by multi-point intermittent heat sealing, alternating with the first main sealing edge 5, which is beneficial to balance redundancy protection and membrane flexibility.

[0029] like Figure 3 As shown, the double sealing edge structure is continuously arranged around the perimeter of the composite membrane, and the first main sealing edge 5 and the second auxiliary sealing edge 6 both form a complete sealing cavity in the edge area.

[0030] like Figure 3 As shown, the materials of each layer of the composite membrane are combined using an environmentally friendly adhesive process to facilitate the recycling of pharmaceutical packaging.

[0031] The working principle of this invention is as follows: First, the outer barrier membrane 2 is firmly bonded to the intermediate functional layer 3 via adhesive bonding, providing primary oxygen and water vapor barrier. The intermediate functional layer 3 is then hot-rolled with the inner heat-sealing layer 4, maintaining overall flatness and providing a good melting interface for subsequent heat sealing. After the three layers are combined, the membrane exhibits excellent mechanical strength and barrier performance in the non-sealed area, laying the foundation for subsequent treatment of the sealed area. Second, hot pressure is applied between the inner heat-sealing layer 4 and the intermediate functional layer 3, with the temperature controlled at 110–120℃ and the pressure at 0.4–0.5MPa, forming a first main sealing edge 5 with a width of 3–10mm. This structure achieves primary gas-tight sealing through molecular melting and interpenetration. After maintaining a center distance of 1–3 mm from the first main sealing edge 5, a second auxiliary sealing edge 6 with a width of 2–5 mm is formed by multi-point intermittent hot pressing between the intermediate functional layer 3 and the outer barrier film 2, providing redundant protection for the main sealing edge. Finally, the drainage groove is a linear or wavy indentation with a groove width of 0.2–0.5 mm and a depth of 20–30% of the film thickness. When residual gas or water vapor in the sealing cavity expands due to temperature changes, the drainage groove guides it to overflow along the outside of the groove, avoiding excessive internal pressure that could cause the sealing edge to rupture or bulge. Through the coordinated cooperation of the first main sealing edge 5, the second auxiliary sealing edge 6, and the drainage groove, triple safety protection for the packaging cavity is achieved, while maintaining the environmentally friendly and recyclable characteristics of the overall film.

[0032] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. A composite film for pharmaceutical packaging with double sealing edges, characterized in that, The composite membrane body includes an outer barrier membrane (2) on its top surface, a functional layer (3) on its bottom surface, an inner heat-sealing layer (4) on its bottom surface, and a double sealing edge structure on the periphery of the composite membrane body. The double sealing edge includes a first main sealing edge (5) and a second auxiliary sealing edge (6). The first main sealing edge (5) is located between the inner heat-sealing layer (4), the intermediate functional layer (3), and the outer barrier membrane (2) and is sealed by heat pressing. The first main sealing edge (5) and the second auxiliary sealing edge (6) are formed by hot pressing to provide a primary seal. The second auxiliary sealing edge (6) is located outside the first main sealing edge (5). The second auxiliary sealing edge (6) is located at the edge area of ​​the middle functional layer (3) and the outer barrier film (2) and is formed by hot pressing to provide redundant sealing protection and enhance barrier performance. A guide groove is provided between the first main sealing edge (5) and the second auxiliary sealing edge (6). The guide groove is used to guide the residual gas or water vapor in the sealing area to dissipate along the groove to reduce the internal cavity pressure and prevent bulging and rupture.

2. The composite film for pharmaceutical packaging with double sealing edges according to claim 1, characterized in that, The outer barrier film (2) is made of PET material. The outer barrier film (2) and the middle functional layer (3) are bonded together by multiple layers of adhesive to improve barrier performance.

3. The composite film for pharmaceutical packaging with double sealing edges according to claim 1, characterized in that, The inner heat-sealing layer (4) is made of CPP material and is connected to the intermediate functional layer (3) by hot rolling.

4. The composite film for pharmaceutical packaging with double sealing edges according to claim 1, characterized in that, The heat-sealing width of the first main sealing edge (5) is 3-10 mm, the heat-sealing width of the second auxiliary sealing edge (6) is 2-5 mm, and the center distance between the first main sealing edge (5) and the second auxiliary sealing edge (6) is 1-3 mm.

5. A composite film for pharmaceutical packaging with double sealing edges according to claim 1, characterized in that, The guide groove is linear and adjusts the stress distribution and pressure relief effect of the sealing area with the first main sealing edge (5) and the second auxiliary sealing edge (6).

6. A composite film for pharmaceutical packaging with double sealing edges according to claim 1, characterized in that, The second auxiliary sealing edge (6) is formed by multi-point intermittent heat sealing and alternates with the first main sealing edge (5), which is beneficial to balance redundancy protection and membrane flexibility.

7. A composite film for pharmaceutical packaging with double sealing edges according to claim 1, characterized in that, The dual sealing edge structure is continuously arranged around the perimeter of the composite membrane, and the first main sealing edge (5) and the second auxiliary sealing edge (6) both form a complete sealing cavity in the edge region.

8. A composite film for pharmaceutical packaging with double sealing edges according to claim 1, characterized in that, The composite membrane body is made up of materials in each layer using an environmentally friendly adhesive process to facilitate the recycling of pharmaceutical packaging.

Images