A container forming die apparatus

Abstract

This utility model discloses a container forming mold device, including a first mold assembly and a second mold assembly arranged opposite to each other. The first mold assembly has a push rod, a first air chamber, a second air chamber, a first filling and venting channel, and a second filling and venting channel. One end of the push rod has a push block, and the other end has a piston assembly. The first and second air chambers are located on both sides of the piston assembly. The first filling and venting channel communicates with the first air chamber, and the second filling and venting channel communicates with the second air chamber. Inflating the first air chamber through the first filling and venting channel pushes the push rod to move, causing the push block to extend into the forming cavity and compress the container, expelling the gas inside. Even if subsequent heating causes expansion, the container will not bulge. Inflating the second air chamber through the second filling and venting channel pushes the push rod to move in the opposite direction, causing the push block to retract from the forming cavity. The first filling and venting channel, the first air chamber, etc., are integrated within the first mold assembly, occupying no additional space and resulting in a compact structure.

Description

Technical Field

[0001] This utility model relates to a blow-fill-seal integrated machine, and more particularly to a container forming mold device. Background Technology

[0002] Large-volume infusion bottles typically reach or exceed 200ml. For these large-volume bottles, the forming mold of the blow-fill-seal (BFS) machine generally uses positive pressure blowing (i.e., filling the preform with clean pressurized gas to make it expand). Because the mold closing causes the molten preform to form a bottle with a relatively high initial temperature (of course, the liquid in the syringe also absorbs some heat when passing through the extrusion die), the gas inside the bottle expands when heated. During subsequent sterilization, the gas expands again due to heating, causing the bottle to bulge and affecting its appearance. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a blow-fill-seal method for containers that is easy to operate and helps to prevent bulging.

[0004] This utility model further provides a container forming mold device that is simple in structure, compact, reliable, and easy to maintain.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A blow-fill-seal method for a container includes the following steps: Container forming and filling: The forming molds of the first mold assembly and the second mold assembly are closed to form a container, and the filling tool is used to fill the container; Container venting: The top block on the first mold assembly extends into the molding cavity to vent the gas inside the container; Container sealing: The sealing molds of the first mold assembly and the second mold assembly close to seal the container.

[0006] A container forming mold device includes a first mold assembly and a second mold assembly arranged opposite to each other. The first mold assembly is provided with a push rod, a first air chamber, a second air chamber, a first filling and venting channel, and a second filling and venting channel. One end of the push rod is provided with a push block, and the other end is provided with a piston assembly. Along the axial direction of the push rod, the first air chamber and the second air chamber are located on both sides of the piston assembly. The first filling and venting channel communicates with the first air chamber, and the second filling and venting channel communicates with the second air chamber.

[0007] As a further improvement to the above technical solution: the first mold assembly is further provided with a guide ring, and the push rod passes through the guide ring.

[0008] As a further improvement to the above technical solution: the second air chamber is located between the guide ring and the piston assembly, and the guide ring is provided with an air guide hole for connecting the second charging and discharging channel and the second air chamber.

[0009] As a further improvement to the above technical solution: a first buffer pad is provided on the side of the guide ring near the piston assembly, and a second buffer pad is provided in the first air chamber.

[0010] As a further improvement to the above technical solution: a guide sleeve is provided on the outer periphery of the push rod, and the piston assembly is in contact with the inner wall of the guide sleeve.

[0011] As a further improvement to the above technical solution: the piston assembly includes a mounting base, and the mounting base is provided with first seals on both axial sides, the first seals abutting against the inner wall of the guide sleeve.

[0012] As a further improvement to the above technical solution: a wear-resistant ring is provided on the outer periphery of the mounting base.

[0013] As a further improvement to the above technical solution: the push rod is provided with a limiting step, the piston assembly also includes a locking member provided on the push rod, and the mounting seat is provided between the limiting step and the locking member.

[0014] As a further improvement to the above technical solution: a second sealing element is provided between the end of the push rod with the top block and the first mold assembly.

[0015] Compared with the prior art, the advantages of this utility model are: The blow-fill-seal method for containers disclosed in this utility model involves squeezing the container by inserting a top block into the forming cavity of the first mold assembly after the container has been filled and before it has been sealed, thereby expelling the gas inside the container. Because the amount of gas inside the container is reduced, even if the container expands due to subsequent heating, it will not cause the container to bulge, and the operation is convenient.

[0016] The container forming mold device disclosed in this utility model can inflate the first air chamber through the first inflation / deflation channel, pushing the ejector rod to move and causing the ejector block to extend into the forming cavity to squeeze the container, thus expelling the gas inside. Because the amount of gas inside the container is reduced, even if it expands due to subsequent heating, it will not cause the container to bulge. Inflation of the second air chamber through the second inflation / deflation channel pushes the ejector rod to move in the opposite direction, causing the ejector block to retract from the forming cavity. The first inflation / deflation channel, the first air chamber, the second inflation / deflation channel, and the second air chamber are all integrated inside the first mold assembly, occupying no extra space, resulting in a more compact structure. It also reduces some connecting pipes, which helps prevent air leakage, improves reliability, and facilitates inspection and maintenance.

[0017] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] Figure 1 This is a partial enlarged view of the container forming mold device of this utility model. Figure 2 This is a simplified schematic diagram of the container forming mold device of this utility model.

[0019] The labels in the diagram represent: 1. First mold assembly; 11. First air chamber; 12. Second air chamber; 13. First filling and venting channel; 14. Second filling and venting channel; 141. First segment; 142. Second segment; 2. Second mold assembly; 21. Mold body; 211. Molding mold; 212. Sealing mold; 213. Molding cavity; 22. Mold frame; 3. Ejector rod; 31. Limiting step; 32. Ejector block; 4. Piston assembly; 41. Mounting seat; 42. First seal; 43. Wear-resistant ring; 44. Locking component; 5. Guide ring; 51. Air vent; 61. First buffer pad; 62. Second buffer pad; 7. Guide sleeve; 8. Second seal; 9. Sealing component. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 The blow-fill-seal method for the container in this embodiment includes the following steps. Container forming and filling: The forming molds 211 of the first mold assembly 1 and the second mold assembly 2 are closed to form a container, and the filling tool is used to fill the container; Container venting: The top block 32 on the first mold assembly 1 extends into the molding cavity 213 to vent the gas inside the container; Container sealing: The sealing mold 212 of the first mold assembly 1 and the second mold assembly 2 closes to seal the container. The container may be, for example, a large infusion bottle.

[0025] In the container blow-fill-seal method of this embodiment, after the container is filled and before it is sealed, the top block 32 extends into the molding cavity 213 of the first mold assembly 1 to squeeze the container, so that the gas in the container is discharged. Since the amount of gas in the container is reduced, even if it expands due to heat later, it will not cause the container to bulge, and the operation is convenient.

[0026] Example 2 like Figure 1 and Figure 2As shown, the container forming mold device of this embodiment includes a first mold assembly 1 and a second mold assembly 2 arranged opposite to each other. The first mold assembly 1 is provided with a push rod 3, a first air chamber 11, a second air chamber 12, a first filling and venting channel 13, and a second filling and venting channel 14. One end of the push rod 3 is provided with a push block 32, and the other end is provided with a piston assembly 4. Along the axial direction of the push rod 3, the first air chamber 11 and the second air chamber 12 are located on both sides of the piston assembly 4. The first filling and venting channel 13 communicates with the first air chamber 11, and the second filling and venting channel 14 communicates with the second air chamber 12. Both the first mold assembly 1 and the second mold assembly 2 include a mold body 21 and a mold frame 22. The mold body 21 is mounted on the mold frame 22 and is driven by the mold frame 22 to achieve mold opening and closing. The mold body 21 mainly includes a forming mold 211 and a sealing mold 212. It is understood that the first air chamber 11, the second air chamber 12, the first filling and venting channel 13, and the second filling and venting channel 14 are located inside the forming mold 211.

[0027] In this embodiment, the container forming mold device can inflate the first air chamber 11 through the first inflation / deflation channel 13, pushing the ejector rod 3 to move, causing the ejector block 32 to extend into the forming cavity 213 to squeeze the container and expel the gas inside. Because the amount of gas inside the container is reduced, even if it expands due to subsequent heating, it will not cause the container to bulge. Inflation can also be achieved by inflating the second air chamber 12 through the second inflation / deflation channel 14, pushing the ejector rod 3 to move in the opposite direction, causing the ejector block 32 to retract from the forming cavity 213, preparing for the next action. The first inflation / deflation channel 13, the first air chamber 11, the second inflation / deflation channel 14, and the second air chamber 12 are all integrated inside the first mold assembly 1, without occupying additional space, resulting in a more compact structure. This also reduces some connecting pipes, which helps prevent air leakage, improves reliability, and facilitates maintenance.

[0028] The working process of the container forming mold device in this embodiment is as follows: Container forming and filling: The forming molds 211 of the first mold assembly 1 and the second mold assembly 2 are closed to form a container, and the filling tool is used to fill the container; Container venting: The first filling and venting channel 13 fills the first air chamber 11 with air and pushes the top rod 3 to move (at this time, the gas in the second air chamber 12 is squeezed and discharged from the second filling and venting channel 14), causing the top block 32 to extend out of the molding cavity 213 to squeeze the container and the gas in the container is discharged. Container sealing: The sealing mold 212 of the first mold assembly 1 and the second mold assembly 2 closes to seal the container; Top block 32 reset: The second inflation and deflation channel 14 inflates the second air chamber 12, pushing the top rod 3 to move in the opposite direction, causing the top block 32 to retract from the molding cavity 213 (at this time, the gas in the first air chamber 11 is squeezed and discharged from the first inflation and deflation channel 13).

[0029] Furthermore, in this embodiment, the first mold assembly 1 is also provided with a guide ring 5, and the ejector rod 3 passes through the guide ring 5. The guide ring 5 can provide support and guidance for the ejector rod 3, preventing the ejector rod 3 from deviating during reciprocating movement, and further improving the reliability of the device.

[0030] Furthermore, in this embodiment, the second air chamber 12 is located between the guide ring 5 and the piston assembly 4. The guide ring 5 is provided with a vent hole 51 for connecting the second charging / discharging channel 14 and the second air chamber 12. The second charging / discharging channel 14 and the second air chamber 12 can be connected through the vent hole 51, thereby realizing the charging / discharging function of the second air chamber 12. See details. Figure 1 Since the second inflation / exhaust channel 14 needs to connect to the second air chamber 12 and is relatively long, in order to facilitate processing and manufacturing, the second inflation / exhaust channel 14 includes a first segment 141 and a second segment 142 that are perpendicular to each other. After the processing of the first segment 141 and the second segment 142 is completed, the end of the second segment 142 connected to the first segment 141 is sealed by a sealing member 9, so that the gas can flow along the set path. Preferably, the sealing member 9 and the first mold assembly 1 are connected by a thread, which is reliable and easy to disassemble and assemble.

[0031] Furthermore, in this embodiment, a first buffer pad 61 is provided on the side of the guide ring 5 near the piston assembly 4, and a second buffer pad 62 is provided in the first air chamber 11. When the push rod 3 and the piston assembly 4 reciprocate, the first buffer pad 61 and the second buffer pad 62 can play a buffering role, avoiding damage caused by rigid collision. The structure is simple and effective.

[0032] Furthermore, in this embodiment, a guide sleeve 7 is provided on the outer periphery of the push rod 3, and the piston assembly 4 abuts against the inner wall of the guide sleeve 7. The abutment between the piston assembly 4 and the guide sleeve 7 against the inner wall can achieve a sealed isolation between the first air chamber 11 and the second air chamber 12 to prevent leakage, and at the same time can provide a guiding effect for the reciprocating movement of the piston assembly 4 to avoid deviation or shaking.

[0033] Furthermore, in this embodiment, the piston assembly 4 includes a mounting base 41, and first sealing elements 42 (such as O-rings, sealing rings, etc.) are provided on both axial sides of the mounting base 41. The first sealing elements 42 are in contact with the inner wall of the guide sleeve 7. The mounting base 41 provides a mounting foundation for the first sealing elements 42. The first sealing elements 42 are provided on both axial sides of the mounting base 41, which is beneficial to achieve bidirectional sealing during the reciprocating movement process. The structure is simple and reliable.

[0034] Furthermore, in this embodiment, a wear-resistant ring 43 is provided on the outer periphery of the mounting base 41. Compared to the mounting base 41 directly contacting the inner wall of the guide sleeve 7, using a wear-resistant ring 43 with better wear resistance to contact the inner wall of the guide sleeve 7 is beneficial to reduce wear and extend service life.

[0035] Furthermore, in this embodiment, the push rod 3 is provided with a limiting step 31, and the piston assembly 4 also includes a locking member 44 (e.g., a T-shaped locking nut) provided on the push rod 3. The mounting seat 41 is located between the limiting step 31 and the locking member 44. By cooperating with the locking member 44, the axial positioning of the mounting seat 41 and the first sealing member 42 is achieved, preventing movement relative to the push rod 3, further improving reliability, and facilitating disassembly and assembly.

[0036] Furthermore, in this embodiment, the top rod 3 has a top block 32 at one end ( Figure 1 A second sealing element 8 (such as an O-ring or sealing ring) is provided between the left end of the ejector rod 3 and the first mold assembly 1, which can achieve a seal between the left end of the ejector rod 3 and the first mold assembly 1, preventing gas in the second air chamber 12 from leaking from the gap between the left end of the ejector rod 3 and the first mold assembly 1.

[0037] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A container forming mold apparatus, comprising a first mold assembly (1) and a second mold assembly (2) arranged opposite to each other, characterized in that: The first mold assembly (1) is provided with a push rod (3), a first air chamber (11), a second air chamber (12), a first filling and venting channel (13), and a second filling and venting channel (14). One end of the push rod (3) is provided with a push block (32), and the other end is provided with a piston assembly (4). Along the axial direction of the push rod (3), the first air chamber (11) and the second air chamber (12) are located on both sides of the piston assembly (4). The first filling and venting channel (13) is connected to the first air chamber (11), and the second filling and venting channel (14) is connected to the second air chamber (12).

2. The container forming mold device according to claim 1, characterized in that: The first mold assembly (1) is also provided with a guide ring (5), and the push rod (3) passes through the guide ring (5).

3. The container forming mold apparatus according to claim 2, characterized in that: The second air chamber (12) is located between the guide ring (5) and the piston assembly (4). The guide ring (5) is provided with an air guide hole (51) for connecting the second charging and discharging channel (14) and the second air chamber (12).

4. The container forming mold apparatus according to claim 2, characterized in that: The guide ring (5) is provided with a first buffer pad (61) on the side near the piston assembly (4), and a second buffer pad (62) is provided in the first air chamber (11).

5. The container forming mold apparatus according to claim 1, characterized in that: The top rod (3) is provided with a guide sleeve (7) on its outer periphery, and the piston assembly (4) is in contact with the inner wall of the guide sleeve (7).

6. The container forming mold apparatus according to claim 5, characterized in that: The piston assembly (4) includes a mounting base (41), and the mounting base (41) has a first seal (42) on both axial sides, and the first seal (42) is in contact with the inner wall of the guide sleeve (7).

7. The container forming mold apparatus according to claim 6, characterized in that: The mounting base (41) is provided with a wear-resistant ring (43) on its outer periphery.

8. The container forming mold apparatus according to claim 6, characterized in that: The push rod (3) is provided with a limiting step (31), and the piston assembly (4) also includes a locking member (44) provided on the push rod (3). The mounting seat (41) is located between the limiting step (31) and the locking member (44).

9. The container forming mold apparatus according to any one of claims 1 to 8, characterized in that: The top rod (3) has a second seal (8) between one end of the top block (32) and the first mold assembly (1).

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