Medical PVC (polyvinyl chloride) calendered film

Abstract

The utility model discloses a medical PVC calendered film, and belongs to the technical field of medical instruments. The film comprises a double-sided reticulated area and a visible area, the double-sided reticulated area is formed by rolling double-sided metal, the double-sided reticulated area is formed by closely arranging a plurality of grids, and the highest point of each grid is 0.04 mm-0. 1mm higher than the visible area. The uniform grid lines are formed on the two surfaces of the thin film, so that the thin film still has high anti-adhesion performance in a high-temperature sterilization environment, and the drainage speed is effectively increased when the thin film is made into a medical bag body such as a drainage bag.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a medical-grade PVC calendered film. Background Art

[0002] The main component of PVC is polyvinyl chloride. After PVC is mixed with additives and plasticized, it can be calendered to make a transparent or translucent film with a specific thickness, namely PVC calendered film. Due to its good performance in antibacterial properties, light resistance, aging resistance, high strength and toughness, it is widely used in medical-grade products such as drainage bags, platelet storage bags, urine collection bags, infusion bags, medical equipment packaging films, etc.

[0003] Medical-grade products made of PVC calendered film often need to be sterilized at high temperature before use. However, in the traditional PVC film preparation process, a single-sided metal roller embossing process using a metal roller on one side and a rubber roller on the other side is used to emboss the film surface. The patterns on both sides of the film formed by this process are not consistent, which causes the film to easily adhere after high-temperature sterilization, resulting in poor drainage of the drainage fluid when the film is made into a medical bag, which in turn causes safety issues such as patient infection.

[0004] In addition, in some improved processes, although some medical film manufacturers have been able to overcome the technical problem of easy adhesion, the texture design they use will greatly reduce the speed of liquid discharge. In fact, in addition to the production process and whether the texture on both sides is symmetrical, the texture structure in the film will also have a greater impact on the drainage speed. Therefore, the shape of the texture, related dimensions and connection angles also need to be considered.

[0005] When PVC calendered film is used in medical bags such as drainage bags for peritoneal dialysis, it is often necessary to provide a perspective window to facilitate observation of the state of the liquid in the bag.

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a new PVC calendered film with good anti-adhesion performance, fast liquid outflow speed and a viewing area for observing the liquid. Utility Model Content

[0007] The purpose of the utility model is to provide a new type of PVC calendered film used for medical bags, which has excellent anti-adhesion performance, fast drainage speed to avoid the risk of infection caused by poor drainage, and a visible area to ensure that the film is easy to observe the liquid condition in the bag when it is prepared into a medical bag.

[0008] The purpose of the utility model is achieved through the following structural design: the medical PVC calendered film of the utility model comprises a double-sided reticulated area and a visible area formed by double-sided metal roller pressing, wherein the double-sided reticulated area is formed by a plurality of closely arranged grids, and the highest point of the grid is 0.04mm-0.1mm higher than the visible area.

[0009] In a specific embodiment of the present invention, the shape of the grid is one of rhombus, square, rectangle, triangle, polygon, or a combination of any two of them.

[0010] In a specific embodiment of the present invention, the distance between two adjacent vertices in the grid is 0.37-0.60 mm, and the distance between two mutually symmetrical vertices in the grid is 0.45 mm-0.70 mm.

[0011] In a specific embodiment of the present invention, the minimum angle formed by two adjacent sides in the grid is 80°-100°.

[0012] In a specific embodiment of the present invention, the double-sided textured area is connected to the visible area in a stepped manner.

[0013] In a specific embodiment of the present invention, the film is applied to a medical drainage bag.

[0014] In a specific embodiment of the present invention, the visible area is a transparent area that has not been embossed.

[0015] In a specific embodiment of the present invention, the highest point of one side of the grid is 0.04 mm-0.1 mm higher than the visible area.

[0016] In a specific embodiment of the present invention, the highest point of the other side of the grid is 0.04 mm-0.1 mm higher than the visible area.

[0017] The technical effects of the technical solution provided by the utility model are:

[0018] First, by using the double-sided metal roller embossing process, that is, using upper and lower metal rollers to emboss the surface of the PVC film, both sides of the PVC film are formed with clear textures. Medical-grade products made of this film, such as drainage bags, not only have a more beautiful surface, but also have better anti-adhesion properties on both sides of the bag after medical high-temperature sterilization;

[0019] Second, the unique surface texture design can ensure the speed of drainage while preventing adhesion, so that the liquid can be discharged smoothly;

[0020] Third, by setting a textured area and a visible area without embossing in the PVC calendered film, it is convenient for medical staff to observe the liquid content in the medical bag, foreign matter or turbidity in the liquid, so that medical staff can accurately judge the condition of the liquid in the bag, which has the advantages of improving the work efficiency of medical staff and facilitating observation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the process of PVC calendering film in the prior art;

[0022] Figure 2 This is a schematic diagram of the process of PVC calendering film of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the PVC calendered film of the utility model;

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of the reticulated area in the PVC calendered film of the utility model;

[0025] Figure 5 This is a schematic diagram of the planar structure of the reticulated area in the PVC calendered film of the utility model;

[0026] Figure 6 for Figure 5 Sectional view along the AA plane;

[0027] Figure 7 for Figure 5 Sectional view along plane BB;

[0028] Figure 8 This is a schematic structural diagram of a PVC calendered film according to another embodiment of the present invention;

[0029] Fig. 9 This is a schematic structural diagram of the reticulated area in a PVC calendered film according to another embodiment of the utility model.

[0030] In the figure: 110. rubber roller, 120. metal roller, 210. metal roller, 220. metal roller, 310. reticulated area, 320. visible area, 311. grid, 312. first vertex, 313. second vertex, 314. third vertex, 315. fourth vertex, 316. highest point of grid, 810. reticulated area, 820. visible area. DETAILED DESCRIPTION

[0031] In order to more clearly understand the technical essence and beneficial effects of the present invention, a detailed description will be given below in the form of embodiments. However, the description of the embodiments is not a limitation on the scheme of the present invention. Any equivalent changes made based on the concept of the present invention that are merely formal and not substantial should be regarded as within the scope of the technical scheme of the present invention.

[0032] In the following description, all concepts related to up, down, left, right, front, back, front, and back directions or orientations are based on Figure 1 and Figure 8 The position state is taken as a reference, and therefore it cannot be understood as a special limitation on the technical solution provided by the utility model.

[0033] Example 1

[0034] Figure 1 The conventional process of forming a film by embossing a single-sided metal roller is shown. In the embossing step, a rubber roller 110 is used to emboss the back side of the film, and a metal roller 120 is used to emboss the front side of the film. After the embossing step is completed, clear lines are formed on the front side of the film, but there are no clear lines on the back side of the film.

[0035] Figure 2 The utility model shows the process of forming a film by double-sided metal roller pressing. In the embossing step, both sides of the film are embossed using metal rollers 210 and 220, so that after the embossing step is completed, clear lines can be formed on both sides of the film.

[0036] Figure 3 The structure of the PVC calendered film of the utility model is shown, and the film can be used for medical bags, such as drainage bags, urine collection bags, blood bags, etc. The film consists of a textured area 310 and a visible area 320. Specifically, the textured area 310 is formed by double-sided metal rolling, so that clear patterns can be formed on both sides of the textured area to form a double-sided textured area. The patterns in the double-sided textured area can effectively solve the problem of film adhesion after high-temperature sterilization. The visible area 320 is a transparent area that has not been double-sided metal rolled. The transparent area can facilitate observation when the film is made into a medical bag. For example, when the film is prepared into a drainage bag for peritoneal dialysis, medical staff can observe the liquid content, liquid color, presence of impurities, etc. through the visible area. The visible area 320 can be as follows Figure 1 As shown, the visible area 320 is disposed between the two mesh areas 310 , and the visible area 320 may also be disposed on the left or right side of the two mesh areas, and the present invention does not impose any limitation on this.

[0037] Furthermore, the textured area 310 is formed by a plurality of closely arranged grids, and the shape of the grids can be one of rhombus, square, rectangle, triangle, polygon, or a combination of any two.

[0038] In some embodiments, the textured area 310 and the visible area 320 are connected in a gradual or stepped manner. Specifically, at the connection between the textured area 310 and the visible area 320, the thickness of the textured area 310 gradually decreases and transitions to the visible area 320, so as to avoid a large difference in film thickness at the connection between the textured area 310 and the visible area 320 that affects the appearance and use.

[0039] Figure 4 The three-dimensional structure of the reticulated area 310 of the PVC calendered film of the present invention is shown. The reticulated area 310 is formed by a plurality of closely arranged rhombus-shaped grids. When the film is made into a medical bag, poor texture design often leads to a slow liquid discharge rate. For example, when the film is applied to a drainage bag for peritoneal dialysis, poor drainage may cause infection. Therefore, the present invention designs a unique reticulated structure, which refers to the angle and size of the grid. For details, see Figure 5 , the diamond grid includes four vertices, namely the first vertex 312, the second vertex 313, the third vertex 314, and the fourth vertex 315. Among them, the distance d3 between two adjacent vertices in the grid is 0.37mm-0.60mm, preferably, the distance d3 between two adjacent vertices is 0.42mm-0.55mm, for example, the straight-line distance between the first vertex 312 and the third vertex 314 is 0.50mm. In some embodiments, the distance between two mutually symmetrical vertices in the grid is 0.45mm-0.70mm, preferably, the distance between two mutually symmetrical vertices is 0.50mm-0.65mm, for example, the straight-line distance d2 between the first vertex 312 and the fourth vertex 315 is 0.60mm. For another example, the straight-line distance d1 between the second vertex 313 and the third vertex 314 is 0.55mm. In a specific embodiment of the present invention, the minimum angle α formed by two adjacent edges in the grid is 80°-100°. Preferably, the minimum angle between two adjacent edges is 85°-95°, for example, the minimum angle α is 90°.

[0040] Figure 6 , Figure 7 The Figure 5 Cross-sectional view of the AA and BB surfaces of the reticulated structure. Figure 6 The maximum height d4 of the diamond grid is shown, that is, the maximum height difference between the highest point of the grid area on one side of the film and the surface of the visible area on this side. In some embodiments, the height of d4 is 0.04mm-0.1mm. Specifically, the maximum height of one side of the grid is 0.04mm-0.85mm, preferably, the maximum height of one side of the grid is 0.05mm-0.07mm. The maximum height of the other side of the grid is 0.04mm-0.1mm, preferably, the maximum height of the other side of the grid is 0.05mm-0.08mm.

[0041] The utility model can achieve, through the mesh structure designed with the above dimensions, that, for example, a drainage bag for peritoneal dialysis always remains unobstructed during the peritoneal dialysis process, thereby avoiding the risk of infection due to poor drainage and improving the dialysis effect and comfort of the patient.

[0042] Example 2

[0043] like Figure 8 , Fig. 9 As shown, the difference between this embodiment and the first embodiment is the shape of the grid. In this embodiment, the shape of the grid is a regular hexagon.

[0044] The other technical features of this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0045] In summary, the technical solution provided by the utility model makes up for the deficiencies in the prior art. A PVC calendered film with high strength and toughness is formed by double-sided metal rolling. During the embossing process, a layer of fine lines composed of multiple grids is formed on both sides of the film. By setting the relevant parameters of the grid, excellent anti-adhesion and smooth drainage effect are achieved. In addition, by setting a visible area, a transparent observation area is formed when the film is prepared into a medical bag body, so that medical staff can observe the state of the liquid in the bag body in time.

[0046] It should be understood that the exemplary embodiments described herein should be considered in a descriptive sense only and not for limiting purposes. Descriptions of features or aspects in each embodiment should generally be considered to be feasible for similar features or aspects in other embodiments.

Claims

1. A medical PVC calendered film, characterized in that: It comprises a double-sided reticulated area and a visible area formed by double-sided metal rolling, wherein the double-sided reticulated area is formed by a plurality of closely arranged grids, and the highest point of the grid is 0.04mm-0.1mm higher than the visible area.

2. The medical PVC calendered film according to claim 1, characterized in that: The shape of the grid is one of rhombus, square, rectangle, triangle or a combination of any two thereof.

3. The medical PVC calendered film according to claim 2, characterized in that: The distance between two adjacent vertices in the grid is 0.37-0.60 mm and / or the distance between two mutually symmetrical vertices in the grid is 0.45 mm-0.70 mm.

4. The medical PVC calendered film according to claim 2, characterized in that: The minimum angle formed by two adjacent sides in the grid is 80°-100°.

5. The medical PVC calendered film according to claim 1, characterized in that: The double-sided textured area is connected to the visible area in a stepped manner.

6. The medical PVC calendered film according to claim 1, characterized in that: The film is applied to medical drainage bags.

7. The medical PVC calendered film according to claim 1, characterized in that: The visible area is a transparent area that has not been embossed.

8. The medical PVC calendered film according to claim 1, characterized in that: The highest point of one side of the grid is 0.04 mm to 0.1 mm higher than the visible area.

9. The medical PVC calendered film according to claim 1, characterized in that: The highest point of the other side of the grid is 0.04 mm to 0.1 mm higher than the visible area.

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