A bag sealing machine heat welding system for multilayer co-extruded film infusion bags
The welding system, which controls the temperature with heat transfer oil, solves the temperature gradient problem caused by traditional electric heating tubes, improves the welding quality and stability of multilayer co-extruded film infusion bags, and reduces the risk of leakage.
Patent Information
- Application Number
- CN202522663659.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-16
AI Technical Summary
The electric heating tube of the traditional infusion bag welding mold has a temperature gradient, which can cause the welding surface to stick or have a poor weld, leading to the risk of leakage. In particular, the temperature sensitivity of the low-temperature membrane material can result in insufficient weld strength or thermal degradation of the membrane material.
The welding system, which uses heat transfer oil to control the temperature, employs edge welding, weak welding, and end-pipe welding systems. It utilizes heat transfer oil circuits and mold temperature controllers to precisely control the welding temperature, keeping the temperature gradient within ±1℃, thus avoiding the temperature gradient problem of electric heating tubes.
It improves welding quality, reduces the risk of leakage, ensures the stability of the membrane material and welding strength, and avoids welding defects caused by uneven temperature.
Smart Images
Figure CN224928637U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of welding system technology, specifically to a hot welding system for a bag-making and sealing machine for multi-layer co-extruded film infusion bags. Background Technology
[0002] The powder-liquid dual-chamber bag infusion product is based on a regular soft bag infusion bag, using a special technology to divide it into two independent, sealed chambers. One chamber contains the liquid medication for regular infusion, and the other chamber contains the sterile powder medication. Different medications are sealed in each chamber. Before use, the two chambers are opened, mixed, and then administered intravenously. This is a ready-to-use infusion product. The current technical problem is that the powder-liquid dual-chamber bag infusion product is made by welding a multi-layer co-extruded film and a polypropylene tube. The multi-layer co-extruded film typically contains a heat-sealing layer (such as LDPE), a cationic barrier layer (such as EVOH), and a structural layer (such as PP). During welding, only the heat-sealing layer needs to be melted to avoid damaging the function of other layers. Traditional infusion bag welding molds have a temperature gradient (±5℃) in the heating element, leading to adhesion or incomplete welding of the bag surface and poor welding of the polypropylene interface, causing leakage risks. Low-temperature film materials (such as domestic non-PVC multi-layer co-extruded film) are temperature sensitive; uneven temperature leads to insufficient weld strength or thermal degradation of the film material. Utility Model Content
[0003] To address the problems existing in the prior art, the purpose of this utility model is to provide a hot welding system for a bag-making and sealing machine for multi-layer co-extruded film infusion bags, in order to solve the problem that the electric heating tube of the welding mold of traditional infusion bags has a temperature gradient (±5℃), which leads to adhesion or incomplete welding of the bag welding surface and poor welding of polypropylene interfaces, resulting in the risk of leakage.
[0004] A hot welding system for a bag-making and sealing machine for multilayer co-extruded film infusion bags includes an edge welding system, a weak welding system, and an end-tube welding system. The edge welding system includes an edge welding mold, a first heating oil circuit, and a first mold temperature controller. The first heating oil circuit is connected to the edge welding mold, and the first mold temperature controller is connected to the first heating oil circuit. The first heating oil circuit is used to transport heat transfer oil, and the first mold temperature controller is used to heat the heat transfer oil in the first heating oil circuit. The welding temperature of the edge welding mold is controlled by the temperature of the heat transfer oil. The weak welding system includes a weak welding mold, a second heating oil circuit, and a second mold temperature controller. The second heating oil circuit is connected to the weak welding mold, and the second mold temperature controller is connected to the second heating oil circuit. The second heating oil circuit is used to transport heat transfer oil, and the second mold temperature controller is used to heat the heat transfer oil in the second heating oil circuit. The welding temperature of the weak welding mold is controlled by the temperature of the heat transfer oil. The tube welding system includes a tube welding mold, a third heating oil circuit, and a third mold temperature controller. The third heating oil circuit is connected to the tube welding mold, and the third mold temperature controller is connected to the third heating oil circuit. The third heating oil circuit is used to transport heat transfer oil, and the third mold temperature controller is used to heat the heat transfer oil in the third heating oil circuit. The welding temperature of the tube welding mold is controlled by the temperature of the heat transfer oil.
[0005] Furthermore, the welding mold includes an upper welding mold and a lower welding mold, and the first heating oil circuit includes a first oil circuit disposed on the upper welding mold and a second oil circuit disposed on the lower welding mold. The first oil circuit and the second oil circuit are connected to the first mold temperature controller.
[0006] Furthermore, the upper side welding mold is provided with a first placement groove for installing the first oil circuit, and the lower side welding mold is provided with a second placement groove for installing the second oil circuit.
[0007] Furthermore, the weak welding mold includes a weak welding upper mold and a weak welding lower mold, and the second heating oil circuit includes a third oil circuit disposed on the weak welding upper mold and a fourth oil circuit disposed on the weak welding lower mold, and the third oil circuit and the fourth oil circuit are connected to the second mold temperature controller.
[0008] Furthermore, the upper mold for weak welding is provided with a third placement groove for installing a third oil circuit, and the lower mold for weak welding is provided with a fourth placement groove for installing a fourth oil circuit. Furthermore, the pipe welding mold includes an upper pipe welding mold and a lower pipe welding mold, and the third heating oil circuit includes a fifth oil circuit disposed on the upper pipe welding mold and a sixth oil circuit disposed on the lower pipe welding mold, the fifth oil circuit and the sixth oil circuit being connected to the third mold temperature controller.
[0009] Furthermore, the upper die for welding the nozzle is provided with a fifth placement groove for installing the fifth oil circuit, and the lower die for welding the nozzle is provided with a sixth placement groove for installing the sixth oil circuit.
[0010] Beneficial effects: Controlling the temperature of the heat transfer oil is easier than controlling the temperature of the electric heating element. The temperature change of the heat transfer oil is more uniform, making it easier to control the temperature of the heat transfer oil within a suitable range. The temperature gradient of the electric heating element is ±5℃, while the temperature gradient of the heat transfer oil is ±1℃ according to experiments. Molds heated by heat transfer oil have better welding quality and a lower risk of product leakage. Attached Figure Description
[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the specification will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.
[0012] Figure 1 This is a schematic diagram of the edge welding system structure according to an embodiment of the present utility model; Figure 2 This is a welding schematic diagram of the edge welding system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the weak welding system structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the weak-welding system according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the tube welding system according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the welding system for the nozzle of this utility model.
[0013] In the diagram: 1. First mold temperature controller; 2. Upper mold welded on the side; 3. Lower mold welded on the side; 401. First oil circuit; 402. Second oil circuit; 5. Second mold temperature controller; 6. Upper mold welded on the side; 7. Lower mold welded on the side; 801. Third oil circuit; 802. Fourth oil circuit; 9. Third mold temperature controller; 10. Upper mold welded to the nozzle; 11. Lower mold welded to the nozzle; 1201. Fifth oil circuit; 1202. Sixth oil circuit; 13. Co-extruded film. Detailed Implementation
[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. For ease of explanation, the terms "vertical", "horizontal", "left", "right", "upper", "lower", "inner", "outer", "bottom", etc., used in this specification to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0015] It should be noted that the embodiments and features involved in the embodiments of this utility model can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0016] like Figures 1-6 The illustrated hot welding system for a bag-making and sealing machine for multilayer co-extruded film infusion bags includes an edge welding system, a weak welding system, and an end-tube welding system for welding multilayer co-extruded films to manufacture powder-liquid dual-chamber bags. The edge welding system includes an edge welding mold, a first heating oil circuit, and a first mold temperature controller 1. The first heating oil circuit is connected to the edge welding mold, and the first mold temperature controller 1 is connected to the first heating oil circuit. The first heating oil circuit is used to transport heat transfer oil, and the first mold temperature controller 1 is used to heat the heat transfer oil in the first heating oil circuit. The welding temperature of the edge welding mold is controlled by the temperature of the heat transfer oil. The weak welding system includes a weak welding mold, a second heating oil circuit, and a second mold temperature controller 5. The second heating oil circuit is connected to the weak welding mold, and the second mold temperature controller 5 is connected to the second heating oil circuit. The second heating oil circuit is used to transport heat transfer oil, and the second mold temperature controller 5 is used to heat the heat transfer oil in the second heating oil circuit. The welding temperature of the weak welding mold is controlled by the temperature of the heat transfer oil. The tube welding system includes a tube welding mold, a third heating oil circuit, and a third mold temperature controller 9. The third heating oil circuit is connected to the tube welding mold, and the third mold temperature controller 9 is connected to the third heating oil circuit. The third heating oil circuit is used to transport heat transfer oil, and the third mold temperature controller 9 is used to heat the heat transfer oil in the third heating oil circuit. The welding temperature of the tube welding mold is controlled by the temperature of the heat transfer oil.
[0017] In this embodiment, controlling the temperature of the heat transfer oil is easier than controlling the temperature of the electric heating element. The temperature change of the heat transfer oil is more uniform, making it easier to control the temperature of the heat transfer oil within a suitable range. The temperature gradient of the electric heating element is ±5℃, while the temperature gradient of the heat transfer oil is ±1℃ according to the test. The mold welding quality is better when heated by the heat transfer oil, and the risk of product leakage is lower.
[0018] The edge welding mold includes an upper edge welding mold 2 and a lower edge welding mold 3. The first heating oil circuit includes a first oil circuit 401 disposed on the upper edge welding mold 2 and a second oil circuit 402 disposed on the lower edge welding mold 3. The first oil circuit 401 and the second oil circuit 402 are connected to the first mold temperature controller 1.
[0019] In this embodiment, the edge welding mold has a simple structure, is easy to install and use, and oil circuits are set in the upper edge welding mold 2 and the lower edge welding mold 3 respectively, which can control the welding temperature on the corresponding molds.
[0020] The upper mold 2 is provided with a first placement groove for installing the first oil passage 401, and the lower mold 3 is provided with a second placement groove for installing the second oil passage 402.
[0021] In this embodiment, the first placement slot and the second placement slot are provided to facilitate the installation of the first oil passage 401 and the second oil passage 402.
[0022] The weak welding mold includes a weak welding upper mold 6 and a weak welding lower mold 7. The second heating oil circuit includes a third oil circuit 801 disposed on the weak welding upper mold 6 and a fourth oil circuit 802 disposed on the weak welding lower mold 7. The third oil circuit 801 and the fourth oil circuit 802 are connected to the second mold temperature controller 5.
[0023] In this embodiment, the weak welding mold has a simple structure, is easy to install and use, and oil circuits are set in the weak welding upper mold 6 and the weak welding lower mold 7 respectively, which can control the welding temperature on the corresponding molds.
[0024] The upper mold 6 for weak welding is provided with a third placement groove for installing the third oil circuit 801, and the lower mold 7 for weak welding is provided with a fourth placement groove for installing the fourth oil circuit 802.
[0025] In this embodiment, the third placement slot and the fourth placement slot are provided to facilitate the installation of the third oil circuit 801 and the fourth oil circuit 802.
[0026] The tube welding mold includes a tube welding upper mold 10 and a tube welding lower mold 11. The third heating oil circuit includes a fifth oil circuit 1201 provided on the tube welding upper mold 10 and a sixth oil circuit 1202 provided on the tube welding lower mold 11. The fifth oil circuit 1201 and the sixth oil circuit 1202 are connected to the third mold temperature controller 9.
[0027] In this embodiment, the tube welding mold has a simple structure, is easy to install and use, and has oil circuits set in the upper tube welding mold 10 and the lower tube welding mold 11 respectively, which can control the welding temperature on the corresponding molds.
[0028] The upper mold 10 for welding the nozzle is provided with a fifth placement groove for installing the fifth oil passage 1201, and the lower mold 11 for welding the nozzle is provided with a sixth placement groove for installing the sixth oil passage 1202.
[0029] In this embodiment, the fifth placement slot and the sixth placement slot are provided to facilitate the installation of the fifth oil passage 1201 and the sixth oil passage 1202.
[0030] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from its spirit and scope. Thus, if such modifications and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include such modifications and modifications.
Claims
1. A heat welding system for sealing multilayer co-extruded film infusion bags, characterized in that, This includes edge welding systems, weak welding systems, and nozzle welding systems; The edge welding system includes an edge welding mold, a first heating oil circuit, and a first mold temperature controller. The first heating oil circuit is connected to the edge welding mold, and the first mold temperature controller is connected to the first heating oil circuit. The first heating oil circuit is used to transport heat transfer oil, and the first mold temperature controller is used to heat the heat transfer oil in the first heating oil circuit. The welding temperature of the edge welding mold is controlled by the temperature of the heat transfer oil. The weak welding system includes a weak welding mold, a second heating oil circuit, and a second mold temperature controller. The second heating oil circuit is connected to the weak welding mold, and the second mold temperature controller is connected to the second heating oil circuit. The second heating oil circuit is used to transport heat transfer oil, and the second mold temperature controller is used to heat the heat transfer oil in the second heating oil circuit. The welding temperature of the weak welding mold is controlled by the temperature of the heat transfer oil. The tube welding system includes a tube welding mold, a third heating oil circuit, and a third mold temperature controller. The third heating oil circuit is connected to the tube welding mold, and the third mold temperature controller is connected to the third heating oil circuit. The third heating oil circuit is used to transport heat transfer oil, and the third mold temperature controller is used to heat the heat transfer oil in the third heating oil circuit. The welding temperature of the tube welding mold is controlled by the temperature of the heat transfer oil.
2. The hot welding system for sealing multilayer co-extruded film infusion bags according to claim 1, characterized in that, The welding mold includes an upper welding mold and a lower welding mold. The first heating oil circuit includes a first oil circuit disposed on the upper welding mold and a second oil circuit disposed on the lower welding mold. The first oil circuit and the second oil circuit are connected to a first mold temperature controller.
3. The hot welding system for sealing multilayer co-extruded film infusion bags according to claim 2, characterized in that, The upper side welding mold is provided with a first placement groove for installing the first oil circuit, and the lower side welding mold is provided with a second placement groove for installing the second oil circuit.
4. The hot welding system for sealing multilayer co-extruded film infusion bags according to claim 1, characterized in that, The weak welding mold includes a weak welding upper mold and a weak welding lower mold. The second heating oil circuit includes a third oil circuit disposed on the weak welding upper mold and a fourth oil circuit disposed on the weak welding lower mold. The third oil circuit and the fourth oil circuit are connected to the second mold temperature controller.
5. The hot welding system for sealing multilayer co-extruded film infusion bags according to claim 4, characterized in that, The upper mold for weak welding is provided with a third placement groove for installing a third oil circuit, and the lower mold for weak welding is provided with a fourth placement groove for installing a fourth oil circuit.
6. The hot welding system for sealing multilayer co-extruded film infusion bags according to claim 1, characterized in that, The pipe welding mold includes an upper pipe welding mold and a lower pipe welding mold. The third heating oil circuit includes a fifth oil circuit disposed on the upper pipe welding mold and a sixth oil circuit disposed on the lower pipe welding mold. The fifth oil circuit and the sixth oil circuit are connected to the third mold temperature controller.
7. The hot welding system for sealing multilayer co-extruded film infusion bags according to claim 6, characterized in that, The upper die for welding the nozzle is provided with a fifth placement groove for installing the fifth oil circuit, and the lower die for welding the nozzle is provided with a sixth placement groove for installing the sixth oil circuit.