Cylindrical bag body forming method

Abstract

This application relates to the field of biopharmaceutical technology, and in particular to a method for forming a cylindrical bag. It includes cutting a membrane material to size, welding two cut membrane materials according to specified steps, and then inflating or injecting liquid into the internal space of the welded membrane material to form a finished cylindrical bag. This cylindrical bag forming method eliminates the need for molds and the requirement to produce molds of the corresponding size each time, significantly reducing production costs. Furthermore, the forming process is convenient, quick, simple, practical, and highly efficient.

Description

Technical Field

[0001] This application relates to the field of biopharmaceutical technology, and in particular to a method for forming a cylindrical bag. Background Technology

[0002] Cylindrical bags are a common bag shape in product lines, widely used in the biopharmaceutical field, such as 3F cylindrical bags. Current technology typically produces these cylindrical bags by welding pre-cut film material using a heated cylindrical welding mold. Figure 1 As shown, the membrane material is first cut to the required dimensions. Then, the cut membrane material 2 is welded into a column 4 using straight-line welding. Next, the column 4 is fitted into a cylindrical mold 5 and the two ends are flanged 6. Then, membrane material 1 and membrane material 3 are placed on the two flanged edges 6 respectively. The mold is then closed by pressing the mold 7 to seal the top and bottom. Finally, it is heated to form the finished product 8. Figure 1 The diameter and height of the finished product are both described using the symbol x.

[0003] However, this method involves a complicated forming process and requires the use of molds. Furthermore, different sizes of molds need to be pre-produced for bags of different diameters, resulting in high production costs. Summary of the Invention

[0004] The purpose of this application is to provide a method for forming a cylindrical bag to solve the technical problems of cumbersome forming process and high production cost in the prior art.

[0005] This application provides a method for forming a cylindrical bag, including:

[0006] Step 100: Cut the membrane material. The membrane material includes a square portion and two angular portions connected to opposite sides of the square portion. The square portion includes a first side and a second side with a length of h and opposite to each other, and a third side and a fourth side with a length of 3.14x / 2 and opposite to each other. The angular portion includes four identical isosceles triangles, namely a first isosceles triangle, a second isosceles triangle, a third isosceles triangle, and a fourth isosceles triangle. The length of each adjacent equal side of the isosceles triangle is x / 2, and the length of its hypotenuse is 3.14x / 4. The first isosceles triangle and the second isosceles triangle are connected sequentially along the third side, and the hypotenuse of the first isosceles triangle coincides with the hypotenuse of the second isosceles triangle and the third side. The third isosceles triangle and the fourth isosceles triangle are connected sequentially along the fourth side, and the hypotenuse of the third isosceles triangle coincides with the hypotenuse of the fourth isosceles triangle and the fourth side. Cut two identical membrane materials, namely the first membrane material and the second membrane material.

[0007] Step 200: Align the first membrane material and the second membrane material, weld the first edges of the aligned first membrane material and the second membrane material together, and weld the second edges of the aligned first membrane material and the second membrane material together.

[0008] The first isosceles triangle includes a first short side and a second short side of adjacent length and equal length; the second isosceles triangle includes a third short side and a fourth short side of adjacent length and equal length, with the second short side and the third short side being adjacent; the third isosceles triangle includes a fifth short side and a sixth short side of adjacent length and equal length; the fourth isosceles triangle includes a seventh short side and an eighth short side of adjacent length and equal length, with the sixth short side and the seventh short side being adjacent; the first short sides of the aligned first membrane material and the second membrane material are welded together, the fourth short sides are welded together, the fifth short sides are welded together, and the eighth short sides are welded together.

[0009] Step 300: Weld the second short side and the third short side of the first membrane material together; weld the second short side and the third short side of the second membrane material together; weld the sixth short side and the seventh short side of the first membrane material together; weld the sixth short side and the seventh short side of the second membrane material together.

[0010] Step 400: Inflate or inject liquid into the internal space of the welded membrane material to form a cylindrical bag. The height of the cylindrical bag is h, and the diameter of its circular top and bottom surfaces is x.

[0011] Furthermore, the first membrane material and the second membrane material have outwardly extended edges on the sides that need to be welded, and the welding is performed on the extended edges.

[0012] Furthermore, the outward extension width of the reserved edge is 8-12mm.

[0013] Furthermore, the welding is performed using a straight-edge welding method.

[0014] Furthermore, the membrane material is a heat-sealing membrane material, and the welding is performed using a hot-melt welding method; or

[0015] The welding is performed using a high-frequency welding method in the form of electric current.

[0016] Furthermore, the square portion of the membrane material is rectangular or square.

[0017] Furthermore, x is greater than or equal to 169 mm.

[0018] Furthermore, the volume of the finished cylindrical bag is 1L to 2000L; and / or

[0019] The h is greater than or equal to 200 mm.

[0020] Furthermore, the membrane material has pre-drilled holes that can be opened and closed, through which air can be injected or liquid can be injected.

[0021] Furthermore, the cylindrical bag is a 3F cylindrical bag.

[0022] Compared with the prior art, the cylindrical bag forming method provided in this application does not require the use of molds. By cutting two membrane materials according to the size and shape requirements, welding the two membrane materials together as required, and finally inflating or injecting liquid to expand the welded shape, a cylindrical bag of the predetermined size can be formed. The process is convenient, quick and simple, highly practical and efficient. Moreover, it does not require the pre-made molds or the production of molds of the corresponding size each time, which greatly reduces the production cost. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the existing cylindrical bag forming process;

[0025] Figure 2 This is a schematic diagram of the membrane material provided in the embodiments of this application;

[0026] Figure 3 A flowchart of a cylindrical bag forming method provided in an embodiment of this application.

[0027] Figure label:

[0028] 10-Membrane material;

[0029] 11-First membrane material;

[0030] 12-Second membrane material;

[0031] 21-Square section;

[0032] 211 - First side;

[0033] 212 - Second side;

[0034] 31 - First isosceles triangle;

[0035] 32 - Second isosceles triangle;

[0036] 33 - The third isosceles triangle;

[0037] 34 - The fourth isosceles triangle;

[0038] 41 - First short side;

[0039] 42 - Second shorter side;

[0040] 43 - Third shorter side;

[0041] 44 - Fourth shorter side;

[0042] 45 - Fifth short side;

[0043] 46 - The sixth shorter side;

[0044] 47 - The seventh short side;

[0045] 48 - The eighth short side;

[0046] 20 - Cylindrical bag body. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0050] In the description of this application, it should be noted that the terms "center," "upper," and "lower" are used interchangeably.

[0051] The orientation or positional relationship indicated by terms such as "left," "right," "vertical," "horizontal," "inner," and "outer" is based on the orientation or positional relationship shown in the attached diagram, or is the orientation or positional relationship commonly used when using the product in this application.

[0052] The orientation or positional relationship of the components is provided solely for the purpose of facilitating and simplifying the description of this application, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. Furthermore, the term "first,"

[0053] The terms "second" and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0054] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0055] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, "5" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0056] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0057] like Figure 2 and Figure 3 As shown in the embodiment of this application, a method for forming a cylindrical bag is provided. Specifically, the cylindrical bag 20 can be a 3F cylindrical bag commonly used in the biopharmaceutical field.

[0058] The method for forming the cylindrical bag includes:

[0059] Step 100: Cut the film material. The film material 10 includes a square portion 21 and a angular portion connected to the two opposite sides (the third side and the fourth side) of the square portion 21. The square portion 21 includes a first side 211 and a second side 212 with a length of h and opposite sides, and a third side and a fourth side with a length of 3.14x / 2 and opposite sides. The square portion is formed by connecting the first side 211, the third side, the second side 212 and the fourth side end to end in sequence. x is the diameter of the circular top surface and the circular bottom surface of the cylindrical bag body 20 after it is opened, and h is the height of the cylindrical bag body 20 after it is opened. The angular portion includes four identical isosceles triangles, namely the first isosceles triangle 31, the second isosceles triangle 32, the third isosceles triangle 33, the fourth isosceles triangle 34, the fifth isosceles triangle 35, the sixth isosceles triangle 36, the seventh isosceles triangle 37, the elliptical triangle 38, the elliptical triangle 39, the elliptical triangle 31 ... Shape 32, third isosceles triangle 33, and fourth isosceles triangle 34, the length of each of the two adjacent equal sides of the isosceles triangle is x / 2, and the length of its hypotenuse is 3.14x / 4; the first isosceles triangle 31 and the second isosceles triangle 32 are connected sequentially along the aforementioned third side, and the hypotenuse of the first isosceles triangle 31 coincides with the hypotenuse of the second isosceles triangle 32 and the aforementioned third side; the third isosceles triangle 33 and the fourth isosceles triangle 34 are connected sequentially along the aforementioned fourth side, and the hypotenuse of the third isosceles triangle 33 coincides with the hypotenuse of the fourth isosceles triangle 34 and the aforementioned fourth side; and two identical membrane materials 10 are cut, namely the first membrane material 11 and the second membrane material 12.

[0060] The first isosceles triangle 31 includes a first short side 41 and a second short side 42 that are adjacent and of equal length; the second isosceles triangle 32 includes a third short side 43 and a fourth short side 44 that are adjacent and of equal length, and the second short side 42 and the third short side 43 are adjacent to each other; the third isosceles triangle 33 includes a fifth short side 45 and a sixth short side 46 that are adjacent and of equal length; and the fourth isosceles triangle 34 includes a seventh short side 47 and an eighth short side 48 that are adjacent and of equal length, and the sixth short side 46 and the seventh short side 47 are adjacent to each other.

[0061] Step 200: Align the first membrane material 11 and the second membrane material 12, and weld their first edges 211 together. Then weld their second edges 212 together. Next, weld their first short edges 41, fourth short edges 44, fifth short edges 45, and eighth short edges 48 together. Figure 3 In step 200, the welding of the shaded areas of the overlapping first membrane material 11 and second membrane material 12 is preferably performed using a straight-edge welding method.

[0062] Step 300: Weld the second short side 42 and the third short side 43 of the first membrane material 11 together; weld the second short side 42 and the third short side 43 of the second membrane material 12 together; weld the sixth short side 46 and the seventh short side 47 of the first membrane material 11 together; weld the sixth short side 46 and the seventh short side 47 of the second membrane material 12 together. The welding is now complete. In this step, a straight-edge welding method is preferred.

[0063] Step 400: Inflate or inject liquid into the internal space of the aforementioned welded membrane material to form a finished cylindrical bag 20. The height of the cylindrical bag 20 is h, and the diameter of its circular top and bottom surfaces is x.

[0064] Compared with the prior art, the cylindrical bag forming method provided in this application embodiment does not require the use of molds. By cutting two membrane materials 10 according to size and shape requirements, welding the two membrane materials 10 together as required, and finally inflating or injecting liquid to expand the welded shape, a cylindrical bag 20 of a predetermined size can be formed. The process is convenient, quick and simple, highly practical and efficient. Moreover, it does not require the pre-made molds or the production of molds of the corresponding size each time, which greatly reduces the production cost.

[0065] Furthermore, in a preferred embodiment, in step 100, each side (first side 211, second side 212, first short side 41, second short side 42, third short side 43, fourth short side 44, fifth short side 45, sixth short side 46, seventh short side 47, and eighth short side 48) of the aforementioned first membrane material 11 and second membrane material 12 that needs to be welded in subsequent steps 200 and 300 can be provided with an outwardly extended edge, and welding is performed on the extended edge. Preferably, the outward extension width of the extended edge is between 8 and 12 mm, and preferably 12 mm.

[0066] This setup serves two purposes: firstly, it makes welding on the edge more convenient, and it also allows for extra space for welding, preventing the loss of the effective forming size of the membrane material 10 due to welding, which could result in the final inability to form or poor forming results; secondly, it allows for extra space at the connection points, preventing insufficient size when cutting the membrane material 10, which could lead to inability to form or poor forming results. The extra space left on the edge can compensate for any possible insufficient size, ensuring successful final forming.

[0067] Another preferred embodiment is that the aforementioned membrane material 10 may have a pre-drilled hole that can be opened and closed, through which air or liquid can be injected. This pre-drilled hole can be a type of switchable valve. Since the cylindrical bag 20 is itself used for storing liquid, when it is expanded and formed, the pre-drilled hole can be opened directly, and the liquid to be stored can be injected through the pre-drilled hole, thus expanding and forming the cylindrical bag 20 simultaneously. This makes the work more efficient and saves time and costs.

[0068] In one optional embodiment, the aforementioned membrane material 10 is a heat-sealing membrane material, and the aforementioned welding is performed using a hot-melt welding method, which provides better welding results. In another optional embodiment, the aforementioned welding can be performed using a high-frequency welding method in the form of electric current, which provides even better welding results.

[0069] In one specific embodiment, the square portion 21 of the aforementioned membrane material 10 can be either rectangular or square, depending on the specific dimensions required for the formed cylindrical bag body 20, and is not limited here. Specifically, in practical applications, the volume of the cylindrical bag body 20 is generally between 1L and 2000L, the diameter x of the circular top and bottom surfaces of the expanded cylindrical bag body 20 is generally greater than or equal to 169mm, and the height h of the expanded cylindrical bag body 20 is generally greater than or equal to 200mm.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for forming a cylindrical bag, characterized in that, include: Step 100: Cut the membrane material. The membrane material includes a square portion and two angular portions connected to opposite sides of the square portion. The square portion includes a first side and a second side with a length of h and opposite to each other, and a third side and a fourth side with a length of 3.14x / 2 and opposite to each other. The angular portion includes four identical isosceles triangles, namely a first isosceles triangle, a second isosceles triangle, a third isosceles triangle, and a fourth isosceles triangle. The length of each adjacent equal side of the isosceles triangle is x / 2, and the length of its hypotenuse is 3.14x / 4. The first isosceles triangle and the second isosceles triangle are connected sequentially along the third side, and the hypotenuse of the first isosceles triangle coincides with the hypotenuse of the second isosceles triangle and the third side. The third isosceles triangle and the fourth isosceles triangle are connected sequentially along the fourth side, and the hypotenuse of the third isosceles triangle coincides with the hypotenuse of the fourth isosceles triangle and the fourth side. Cut two identical membrane materials, namely the first membrane material and the second membrane material. Step 200: Align the first membrane material and the second membrane material, weld the first edges of the aligned first membrane material and the second membrane material together, and weld the second edges of the aligned first membrane material and the second membrane material together. The first isosceles triangle includes a first short side and a second short side of adjacent length and equal length; the second isosceles triangle includes a third short side and a fourth short side of adjacent length and equal length, with the second short side and the third short side being adjacent; the third isosceles triangle includes a fifth short side and a sixth short side of adjacent length and equal length; the fourth isosceles triangle includes a seventh short side and an eighth short side of adjacent length and equal length, with the sixth short side and the seventh short side being adjacent; the first short sides of the aligned first membrane material and the second membrane material are welded together, the fourth short sides are welded together, the fifth short sides are welded together, and the eighth short sides are welded together. Step 300: Weld the second short side and the third short side of the first membrane material together; weld the second short side and the third short side of the second membrane material together; weld the sixth short side and the seventh short side of the first membrane material together; weld the sixth short side and the seventh short side of the second membrane material together. Step 400: Inflate or inject liquid into the internal space of the welded membrane material to form a cylindrical bag. The height of the cylindrical bag is h, and the diameter of its circular top and bottom surfaces is x. Wherein, the first membrane material and the second membrane material have outwardly extended edges on each side that need to be welded, and the welding is performed on the extended edges.

2. The method for forming a cylindrical bag according to claim 1, characterized in that, The outward extension width of the reserved edge is 8~12mm.

3. The method for forming a cylindrical bag according to claim 1 or 2, characterized in that, The welding method used is straight-edge welding.

4. The method for forming a cylindrical bag according to claim 3, characterized in that, The membrane material is a heat-sealing membrane material, and the welding is performed using a hot-melt welding method; or The welding is performed using a high-frequency welding method in the form of electric current.

5. The method for forming a cylindrical bag according to claim 1, characterized in that, The square portion of the membrane material is rectangular or square.

6. The method for forming a cylindrical bag according to claim 5, characterized in that, The x is greater than or equal to 169 mm.

7. The method for forming a cylindrical bag according to claim 6, characterized in that, The volume of the finished cylindrical bag is 1L~2000L; and / or The h is greater than or equal to 200 mm.

8. The method for forming a cylindrical bag according to claim 1, characterized in that, The membrane material has pre-drilled holes that can be opened and closed, through which air can be injected or liquid can be injected.

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