Multi-layer co-extrusion film bag making machine

Abstract

The utility model discloses a multi-layer co-extrusion film bag making machine, and belongs to the technical field of medical infusion bag preparation. The device comprises a heat sealing mold and a liquid filling opening reserving assembly, the liquid filling opening reserving assembly comprises a suction shell, a first one-way opening unit and a second one-way opening unit, the suction shell comprises a first shell and a second shell, and the second shell is arranged on the first shell in a sleeving mode to form an annular flow guide cavity; the end, close to the heat sealing mold, of the first shell is relatively sealed and connected with the first one-way opening unit, an inner cavity of the first shell is a negative pressure cavity, and the negative pressure cavity can suck air in a co-extrusion film in a one-way mode through the first one-way opening unit, so that the co-extrusion film is relatively flat; the second one-way opening unit is arranged on the first shell, and the negative pressure cavity can suck air in the annular flow guide cavity through the second one-way opening unit. According to the infusion bag, adhesion of the reserved liquid filling opening can be prevented, and the reject ratio of the infusion bag is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical infusion bag preparation, in particular to a multi-layer co-extrusion film bag making machine. Background Art

[0002] The body filling type infusion bag is a newly developed soft packaging infusion bag in China. The infusion bag is formed by welding and sealing an infusion tube cap with a self-sealing function, a medicine adding tube cap and a multi-layer co-extrusion film.

[0003] When using a hot pressing die to hot press and form the co-extrusion film, due to the possible misalignment and wrinkles between the two co-extrusion films, the forming quality of the hot-pressed infusion bag is poor. Summary of the Utility Model

[0004] In view of this, it is necessary to provide a multi-layer co-extrusion film bag making machine to solve the problem that the liquid filling port of the existing infusion bag is prone to adhesion.

[0005] The utility model provides a multi-layer co-extrusion film bag making machine, which includes a hot pressing die for heat-sealing the co-extrusion film, and also includes a liquid filling port reservation component arranged opposite to the hot pressing die. The liquid filling port reservation component includes a suction housing, a first one-way opening unit and a second one-way opening unit. The suction housing includes a first housing body and a second housing body. The second housing body is sleeved on the first housing body to form an annular diversion cavity. One end of the first housing body close to the hot pressing die is relatively sealed and connected to the first one-way opening unit. The inner cavity of the first housing body is a negative pressure cavity. The negative pressure cavity can unidirectionally suck the air in the co-extrusion film through the first one-way opening unit, so that the co-extrusion film is relatively flat. The second one-way opening unit is arranged on the first housing body. The negative pressure cavity can suck the air in the annular diversion cavity through the second one-way opening unit to cool the reserved opening of the infusion bag in contact with the second housing body.

[0006] Further, the opening pressure of the second one-way opening unit is greater than the opening pressure of the first one-way opening unit. Under the action of the negative pressure cavity, the first one-way opening unit opens and sucks the air in the co-extrusion film prior to the second one-way opening unit.

[0007] Further, the second one-way opening unit includes a first opening formed in the first housing body, a blocking piece and an elastic member. One end of the blocking piece is connected to the inner wall of the first housing body. The two ends of the elastic member are respectively connected to the blocking piece and the inner wall of the second housing body. The elastic member can drive the blocking piece to block the first opening.

[0008] Further, one end of the second housing relatively far from the heat-sealing die is sealingly connected to the first housing, the annular diversion cavity is relatively sealed, a second opening for air intake from the outside is formed in the side of the second housing, and the second opening is arranged away from the heat-sealing die.

[0009] Further, a plurality of diversion plates arranged in a zigzag manner are provided in the annular diversion cavity, a relatively zigzag flow channel is formed between adjacent diversion plates, and two ends of the flow channel are respectively communicated with the first opening and the second opening.

[0010] Further, a base layer and a copper coating are sequentially arranged on the second housing from the inside to the outside.

[0011] Further, a horn sleeve is arranged at one end of the first housing close to the heat-sealing die, a small-mouth end of the horn sleeve is connected to the first housing, and an inner cavity of the horn sleeve is communicated with the negative pressure cavity.

[0012] Further, the first one-way opening unit includes a baffle plate and an opening piece, the baffle plate is arranged between the horn sleeve and the first housing, a third opening is formed in the baffle plate, and one side of the opening piece is connected to the baffle plate and arranged opposite to the third opening for one-way opening of the third opening to suck air in the co-extrusion film.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] A multi-layer co-extrusion film bag-making machine of the present utility model is provided with a liquid filling port reservation assembly. The liquid filling port reservation assembly includes a suction housing, a first one-way opening unit and a second one-way opening unit. The suction housing includes a first housing and a second housing. The second housing is sleeved on the first housing, and a space is kept between the first housing and the second housing to form an annular diversion cavity. One end of the first housing close to the heat-sealing die is relatively sealed and connected to the first one-way opening unit. The inner cavity of the first housing is a negative pressure cavity. The negative pressure cavity can suck air in the co-extrusion film unidirectionally through the first one-way opening unit, reduce the negative pressure between the two co-extrusion films, make the two co-extrusion films relatively close and aligned, avoid wrinkles of the co-extrusion films and keep them flat, and help the die to heat-seal and seal the co-extrusion films. The second one-way opening unit is arranged on the first housing. The negative pressure cavity can suck air in the annular diversion cavity through the second one-way opening unit, accelerate the gas flow in the annular diversion cavity, reduce the temperature of the second housing, thereby absorb the temperature at the reserved port of the infusion bag in contact with the second housing, prevent the adhesion of the infusion bag, and reduce the defective rate of the infusion bag. Description of the Drawings

[0015] The accompanying drawings described herein are used to provide a further understanding of the present utility model and form a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0016] Figure 1 is a schematic structural diagram of the whole of the present utility model;

[0017] Figure 2 is a schematic structure of the liquid filling port reserved component in the present utility model Figure 1 ;

[0018] Figure 3 is a schematic structure of the liquid filling port reserved component in the present utility model Figure 2 ;

[0019] Figure 4 is a schematic structure of the liquid filling port reserved component in the present utility model Figure 3 ;

[0020] Figure 5 is a schematic connection structure diagram of the first housing and the flow guide plate in the present utility model;

[0021] Figure 6 is Figure 3 a schematic enlarged partial structure diagram of the A position of

[0022] Figure 7 is a schematic connection structure diagram of the horn sleeve and the second single - way opening unit in the present utility model.

[0023] In the figure, 100, heat - sealing die;

[0024] 200, liquid filling port reserved component; 210, suction housing; 211, first housing; 211a, horn sleeve; 212, second housing; 212a, second opening; 212b, base layer; 212c, aluminum coating; 220, first one - way opening unit; 221, baffle plate; 221a, third opening; 222, opening piece; 230, second one - way opening unit; 231, first opening; 232, blocking piece; 233, elastic member; 240, flow guide plate. Detailed implementation manners

[0025] The following will specifically describe the preferred embodiments of the present utility model in conjunction with the accompanying drawings. Among them, the accompanying drawings form a part of this application and are used together with the embodiments of the present utility model to explain the principle of the present utility model, rather than to limit the scope of the present utility model.

[0026] A multi-layer co-extrusion film bag-making machine in this embodiment relates to the technical field of medical infusion bag preparation. By using the liquid filling port reservation component 200, air is sucked relative to the inside of the co-extrusion film, so that the two co-extrusion films are relatively close and aligned, which helps the die point to heat-seal and seal the co-extrusion film. The liquid filling port reservation component 200 can also cool the liquid filling reserved port, prevent the adhesion of the liquid filling port reserved port, and reduce the defective rate of the infusion bag.

[0027] Please refer to Figures 1 to 7 , a multi-layer co-extrusion film bag-making machine in this embodiment includes a heat-sealing die 100 and a liquid filling port reservation component 200 arranged opposite to the heat-sealing die 100. The heat-sealing die 100 is used to thermally press and seal two co-extrusion films to form an infusion bag. The liquid filling port reservation component 200 can be inserted into the two co-extrusion films to suck air, and while pressing the co-extrusion films tightly, cool the liquid filling port reservation.

[0028] The liquid filling port reservation component 200 includes a suction housing 210, a first one-way opening unit 220, and a second one-way opening unit 230. The suction housing 210 includes a first housing 211 and a second housing 212. The second housing 212 is sleeved on the first housing 211, and a gap is maintained between the first housing 211 and the second housing 212 to form an annular diversion cavity. One end of the first housing 211 close to the heat-sealing die 100 is relatively sealed and connected to the first one-way opening unit 220. The inner cavity of the first housing 211 is a negative pressure cavity, and the negative pressure cavity can unidirectionally suck the air in the co-extrusion film through the first one-way opening unit 220, reduce the negative pressure between the two co-extrusion films, make the two co-extrusion films relatively close and aligned, avoid wrinkles in the co-extrusion film and keep it flat, which helps the die point to heat-seal and seal the co-extrusion film. The second one-way opening unit 230 is arranged on the first housing 211, and the negative pressure cavity can suck the air in the annular diversion cavity through the second one-way opening unit 230, accelerate the gas flow in the annular diversion cavity, reduce the temperature of the second housing 212, thereby absorbing the temperature at the reserved port of the infusion bag in contact with the second housing 212, preventing the adhesion of the infusion bag, and reducing the defective rate of the infusion bag.

[0029] It should be noted that: the liquid filling port of the infusion bag body is formed by a reserved area that is not welded on any one side of the bag body periphery. When the co-extrusion film is thermally pressed and formed by the peripheral heat-sealing die of the bag-making and potting equipment, the multi-layer co-extrusion films in the reserved non-welded area on any one side of the bag body will adhere together under the action of the high temperature of the thermal pressing. In the subsequent bag-opening process, the multi-layer co-extrusion films in the reserved non-welded area on any one side of the infusion bag cannot be separated as the liquid filling port, resulting in defective products, wasting the infusion bags, increasing the production cost invisibly, and reducing the efficiency.

[0030] In some embodiments, please refer to Figures 1 to Figure 5, the opening pressure of the second one-way opening unit 230 is greater than that of the first one-way opening unit 220. Under the action of the negative pressure chamber, the first one-way opening unit 220 opens before the second one-way opening unit 230 and sucks the air in the co-extruded film. Under the negative pressure of the negative pressure chamber, the first one-way opening unit 220 first opens, sucks the air in the co-extruded film, and compresses the co-extruded film so that the two co-extruded films are relatively close and aligned. The second one-way opening unit 230 opens after the two co-extruded films are close, driving the air flow in the annular diversion chamber to cool the second housing 212.

[0031] During use, because the opening negative pressure in the negative pressure chamber is relatively low, the first one-way opening unit 220 will be opened first, which can quickly suck the air in the co-extruded film, making the co-extruded film quickly become flat in the un-welded area. Quickly flattening the co-extruded film helps to improve production efficiency and helps the heat-sealing die 100 to hold the two co-extruded films for heat-sealing. There is relative vacuum between the two co-extruded films, and the first one-way opening unit 220 is relatively closed. After the further action of the negative pressure chamber, the second one-way opening unit 230 is relatively opened, thereby sucking the air in the annular diversion chamber to cool the reserved position of the infusion bag being hot-pressed, so as to reduce the downtime adjustment time and reject rate caused by film layer adhesion.

[0032] By setting different opening pressures, the suction process can be controlled step by step, cooperating with the heat-sealing process of the heat-sealing die 100, reasonably distributing the pressure of the negative pressure chamber. When it is necessary to suck the co-extruded film, the negative pressure is concentrated at the co-extruded film. When it is necessary to cool the second housing 212, the negative pressure is concentrated at the annular diversion chamber. Through reasonable concentration of the negative pressure, the use efficiency of the negative pressure can be improved, the efficiency of the production process and the product quality can be improved, and the reject rate and adjustment time caused by film layer adhesion can be reduced.

[0033] In some embodiments, please refer to Figure 5 and Figure 6 , the second one-way opening unit 230 includes a first opening 231 formed in the first housing 211, a blocking piece 232, and an elastic member 233. One end of the blocking piece 232 is connected to the inner wall of the first housing 211, and both ends of the elastic member 233 are respectively connected to the blocking piece 232 and the inner wall of the second housing 212. The elastic member 233 is specifically a spring, and the spring drives the blocking piece 232 to block the first opening 231 through elastic force. Only when the negative pressure overcomes the elastic force of the spring can the blocking piece 232 be opened.

[0034] The combination of the plugging piece 232 and the elastic member 233 can achieve precise control of the opening pressure. The elastic force of the elastic member 233 determines when the plugging piece 232 opens or closes the first opening 231. By adjusting the elastic coefficient of the elastic member 233, the opening pressure of the plugging piece 232 can be precisely set, so that the second one-way opening unit 230 opens only after the negative pressure chamber reaches a specific pressure, ensuring that the air in the negative pressure chamber is first extracted through the first one-way opening unit 220, and the coextruded film is flattened. Subsequently, when the set pressure is reached, the air in the annular diversion chamber is sucked through the second one-way opening unit 230 for cooling.

[0035] In some embodiments, referring to Figure 3 , one end of the second housing 212 relatively far from the heat sealing die 100 is hermetically connected to the first housing 211, so that the air in the annular diversion chamber does not leak, thereby maintaining a stable negative pressure effect. The relatively sealed annular diversion chamber ensures the negative pressure effect in the negative pressure chamber, so that the air in the coextruded film can be sucked more effectively to keep it flat.

[0036] A second opening 212a for admitting air from the outside is provided on the side of the second housing 212. The second opening 212a is arranged far from the heat sealing die 100, so that the cold air entering from the outside is not directly affected by the high temperature of the heat sealing die 100. The outside air enters through the second opening 212a and is output from the first opening 231 after passing through the annular diversion chamber. The arrangement of the annular diversion chamber enables the cold air to be evenly distributed throughout the diversion chamber, uniformly cooling the second housing 212 and avoiding local overheating.

[0037] It should be particularly noted that: the second opening 212a can be connected to a refrigeration device through a pipeline. The refrigeration device can cool the air entering the annular diversion chamber, reduce the temperature of the air, thereby enhancing the heat exchange between the second housing 212 and the reserved opening of the infusion bag, reducing the temperature of the reserved opening, and preventing the two coextruded films from adhering reversely.

[0038] In some embodiments, referring to Figure 5 , a plurality of diverting plates 240 arranged in a zigzag manner are provided in the annular diversion chamber. A relatively zigzag flow path is formed between adjacent diverting plates 240. The two ends of the flow path are respectively communicated with the first opening 231 and the second opening 212a. The zigzag arrangement of the diverting plates 240 increases the length of the air flow path in the annular diversion chamber. The longer the flow path, the longer the residence time, so that the cold air has more time to contact the diverting plates 240 and the second housing 212 in the chamber for heat exchange, enhancing the cooling effect. At the same time, the extended flow path enables the cold air to be evenly distributed throughout the diversion chamber, avoiding local overcooling or overheating and ensuring a more uniform temperature of the second housing 212.

[0039] In some embodiments, referring toFigure 6 The second housing 212 is provided with a base layer 212b and a copper coating in sequence from the inside to the outside. The base material is a high-strength iron-carbon alloy, providing basic structural support and durability.

[0040] Copper has extremely high thermal conductivity and conducts heat more effectively than most metals. The copper coating can quickly conduct and dissipate heat, improve the cooling efficiency, and maintain a relatively low temperature on the surface of the housing. The high thermal conductivity of copper ensures that heat is quickly conducted to the entire coating surface, achieving a uniform cooling effect and avoiding local overheating.

[0041] In some embodiments, please refer to Figure 1 and Figure 7 One end of the first housing 211 close to the heat-sealing die 100 is provided with a horn sleeve 211a. The small-mouth end of the horn sleeve 211a is connected to the first housing 211, and the inner cavity of the horn sleeve 211a is communicated with the negative-pressure cavity. The sleeve in the shape of a horn has its small-mouth end connected to the first housing 211 and its large-mouth end close to the heat-sealing die 100. The inner cavity of the horn sleeve 211a is communicated with the negative-pressure cavity inside the first housing 211, enabling the horn sleeve 211a to participate in the negative-pressure suction process. The horn-shaped design of the horn sleeve 211a gradually becomes smaller from the large mouth, which can effectively guide and concentrate the airflow.

[0042] In some embodiments, please continue to refer to Figure 7 In the first one-way opening unit 220, it includes a baffle plate 221 and an opening piece 222. The baffle plate 221 is arranged between the horn sleeve 211a and the first housing 211. A third opening 221a is provided on the baffle plate 221. One side of the opening piece 222 is connected to the baffle plate 221 and is arranged opposite to the third opening 221a. The opening piece 222 only opens under negative pressure, ensuring that air can only enter the negative-pressure cavity from the direction of the coextruded film. Through the one-way opening function of the opening piece 222, effective one-way suction is achieved, preventing air backflow and improving the suction efficiency.

[0043] Workflow: First, the multi-layer coextruded film material is transported to the heat-sealing area of the bag-making machine through the feeding device. Then, the liquid-filling port reservation assembly 200 is inserted between the two coextruded films and starts to work. The suction housing 210 performs suction through the negative-pressure cavity. The first one-way opening unit 220 controls the one-way flow of air through the opening piece 222, sucking the air in the coextruded film to make the coextruded film relatively flat. While the heat-sealing die 100 performs heat-sealing and forming, the second one-way opening unit 230 opens under appropriate pressure, sucking the air in the annular diversion cavity for cooling. Through reasonable negative-pressure control and cooling, the coextruded film remains flat near the heat-sealing die 100 without sticking, thus reserving the liquid-filling port.

[0044] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the present utility model.

Claims

1. A multi-layer co-extruded film bag making machine, comprising a heat-sealing die for heat-sealing a co-extruded film, characterized in that: It also includes a filling port reservation component arranged relative to the heat-sealing mold, the filling port reservation component includes a suction shell, a first one-way opening unit and a second one-way opening unit, the suction shell includes a first shell and a second shell, the second shell is sleeved on the first shell to form an annular guide cavity; the first shell is relatively sealed at one end close to the heat-sealing mold and is connected to the first one-way opening unit, the inner cavity of the first shell is a negative pressure cavity, the negative pressure cavity can unidirectionally suck air in the co-extruded film through the first one-way opening unit, so that the co-extruded film is relatively flat; the second one-way opening unit is arranged on the first shell, the negative pressure cavity can suck air in the annular guide cavity through the second one-way opening unit, so as to cool the infusion bag reserved port in contact with the second shell.

2. A multi-layer co-extrusion film bag making machine according to claim 1, characterized in that: The opening pressure of the second one-way opening unit is greater than the opening pressure of the first one-way opening unit. Under the action of the negative pressure chamber, the first one-way opening unit opens before the second one-way opening unit and sucks air from the co-extruded film.

3. A multi-layer co-extrusion film bag making machine according to claim 2, characterized in that: The second one-way opening unit includes a first opening opened on the first shell, a blocking piece and an elastic member, one end of the blocking piece is connected to the inner wall of the first shell, and the two ends of the elastic member are respectively connected to the blocking piece and the inner wall of the second shell, and the elastic member can drive the blocking piece to block the first opening.

4. A multi-layer co-extrusion film bag making machine according to claim 3, characterized in that: One end of the second shell relatively far away from the heat-sealing mold is sealed and connected to the first shell, the annular guide cavity is relatively sealed, and a second opening for air intake from the outside is opened on the side of the second shell, and the second opening is arranged far away from the heat-sealing mold.

5. A multi-layer co-extrusion film bag making machine according to claim 4, characterized in that: A plurality of meandering guide plates are disposed in the annular guide cavity, and a relatively meandering flow channel is formed between adjacent guide plates, and two ends of the flow channel are respectively connected to the first opening and the second opening.

6. The multi-layer co-extrusion film bag making machine according to claim 1, characterized in that: The second shell is provided with a base layer and a copper coating in sequence from the inside to the outside.

7. The multi-layer co-extrusion film bag making machine according to claim 1, characterized in that: A horn sleeve is provided at one end of the first shell body close to the heat-sealing mold, the small-mouth end of the horn sleeve is connected to the first shell body, and the inner cavity of the horn sleeve is communicated with the negative pressure cavity.

8. The multi-layer co-extrusion film bag making machine according to claim 7, characterized in that: The first one-way opening unit includes a baffle plate and an opening sheet. The baffle plate is arranged between the speaker cover and the first shell. A third opening is provided on the baffle plate. One side of the opening sheet is connected to the baffle plate and is arranged opposite to the third opening so as to open the third opening in one direction and suck the air in the co-extruded film.

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