A TPU air nozzle injection mold and injection molding method

Abstract

The invention discloses a TPU air nozzle injection mold, comprising a movable mold and a fixed mold, the movable mold comprising a movable mold seat, a movable mold core and a side core pulling mechanism arranged on the side of the movable mold core, the fixed mold comprising a fixed mold seat and a fixed mold core, the side core pulling mechanism comprising an inner core pulling seat, an outer core pulling seat and a plurality of cores, one end of the core is fixed to the outer core pulling seat, and the other end passes through the inner core pulling seat and is placed on the movable mold core; during the mold opening process, the outer core pulling seat is separated from the inner core pulling seat under the elastic force of an elastic member, while the inner core pulling seat remains stationary and presses the movable mold core, so that the TPU air nozzle performs a core pulling in the mold cavity, so as to effectively reduce the adhesion of the TPU air nozzle to the core, so that when the outer core pulling seat drives the core to move outward for a second core pulling, the core can be smoothly pulled out of the TPU air nozzle, so as to facilitate demoulding, reduce demoulding time and improve production efficiency.

Description

Technical Field

[0001] The invention relates to TPU air nozzle production equipment, and more specifically, to a TPU air nozzle injection mold and an injection molding method. Background Art

[0002] At present, massage chairs with airbag massage function are becoming more and more popular in the market. The air nozzle is an important part of the airbag, and the inflation and deflation of the airbag are both achieved through the air nozzle. The existing air nozzle is usually made of TPU material through injection molding through an injection mold. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the high-pressure injection of heated and melted plastic into the mold cavity by an injection molding machine, and after cooling and solidification, a molded product is obtained.

[0003] Since the air nozzle has an airway structure for inflation and deflation, the injection mold is accordingly provided with a corresponding side core pulling mechanism. During demolding, the movable mold is separated from the fixed mold, and the side core pulling mechanism is pulled out at one time, and then the air nozzle is pried out from the movable mold or the fixed mold using a tool. However, due to the characteristics of TPU rubber material, the product is soft in texture and has a smooth surface, and has strong adhesion to the mold surface. During the side core pulling action, the air nozzle is easily deformed, which can easily cause damage to the air nozzle, a long demolding time, and low production efficiency. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a TPU air nozzle injection mold and an injection molding method.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A TPU air nozzle injection mold comprises a movable mold and a fixed mold, wherein the movable mold comprises a movable mold seat, a movable mold core and a side core pulling mechanism arranged on the side of the movable mold core, the fixed mold comprises a fixed mold seat and a fixed mold core, the side core pulling mechanism comprises an inner core pulling seat, an outer core pulling seat and a plurality of cores, one end of the core is fixed to the outer core pulling seat, and the other end passes through the inner core pulling seat and is placed on the movable mold core; the outer core pulling seat is connected to the inner core pulling seat through a first connecting component, and a pushing elastic member is compressed and arranged between the outer core pulling seat and the inner core pulling seat. When the mold is opened, the outer core pulling seat will be separated from the inner core pulling seat under the elastic force of the pushing elastic member.

[0007] The present invention further provides that: the fixed mold core is installed on the fixed mold base through a second connecting component, and a clamping elastic member is compressed and arranged between the fixed mold core and the fixed mold base. When the mold is opened, the fixed mold core will clamp the movable mold core under the elastic force of the clamping elastic member.

[0008] The present invention is further provided that: the first connecting component includes a first pull rod and a first countersunk hole opened on the outer core pulling seat, the pull rod head of the first pull rod is placed in the first countersunk hole, and the other end passes through the first countersunk hole to be connected to the inner core pulling seat, when the outer core pulling seat is separated from the inner core pulling seat and moves outward to the desired position, the pull rod head of the first pull rod will abut against the bottom of the first countersunk hole.

[0009] The present invention further provides that: the first pull rod is a bolt, wherein the bolt head is placed in the first countersunk hole, and the screw rod passes through the first countersunk hole and is threadedly connected to the inner core-pulling seat.

[0010] The present invention further provides that: the pushing elastic member is a spring, the inner core-pulling seat is provided with a first installation groove for installing the spring, one end of the pushing elastic member is compressed and placed in the first installation groove, and the other end abuts against the outer core-pulling seat.

[0011] The present invention further provides that: the first connecting component includes a pull tab and a separation groove opened on the inner core pulling seat, one end of the pull tab is fixed on the outer core pulling seat, and the other end is provided with a connecting portion and placed in the separation groove, when the outer core pulling seat is separated from the inner core pulling seat and moved outward to the desired position, the connecting portion will abut against the groove wall of the separation groove.

[0012] The present invention further provides that: the outer core-pulling seat comprises an outer core-pulling seat body and a connecting block for installing and fixing the core, and the connecting block is embedded in the outer core-pulling seat body.

[0013] The present invention is further provided that: the second connecting component includes a second pull rod and a second countersunk hole opened on the fixed mold seat, the pull rod head of the second pull rod is placed in the second countersunk hole, and the other end passes through the second countersunk hole to be connected to the inner core pulling seat, and when the fixed mold core is separated from the fixed mold seat and moves forward to the required position, the pull rod head of the second pull rod will abut against the bottom of the second countersunk hole.

[0014] The present invention further provides that: the clamping elastic member is a spring, the fixed mold seat is provided with a second installation groove for installing the spring, one end of the clamping elastic member is compressed and placed in the second installation groove, and the other end abuts against the fixed mold core.

[0015] The present invention also provides a TPU air nozzle injection molding method, using the above-mentioned TPU air nozzle injection molding mold, comprising the following steps:

[0016] S1. Mold closing: The movable mold moves toward the fixed mold, so that the movable mold core, the fixed mold core and the side core pulling mechanism cooperate with each other to form a cavity;

[0017] S2, glue injection: inject glue into the mold cavity after mold closing, and keep pressure to cool;

[0018] S3, mold opening: when the plastic injected into the cavity is cooled and formed, the movable mold is pushed to move away from the fixed mold, and the fixed mold core will still press the movable mold core under the elastic force of the pressing elastic member, and at the same time, the outer core puller will push the elastic member to separate from the inner core puller under the elastic force of the elastic member, driving the core to move outward for the first core pull, while the inner core puller still remains stationary and presses the movable mold core, so that the core and the TPU air nozzle move relative to each other;

[0019] The movable mold is pushed away from the fixed mold to continue moving. The fixed mold core no longer moves forward under the action of the second connecting component, and the fixed mold core is separated from the movable mold core. At the same time, the outer core puller drives the core to move outward for the second core pull, so that the core is pulled out of the TPU air nozzle, and the outer core puller drives the inner core puller to move outward together through the first connecting component, so that the inner core puller is separated from the movable mold core.

[0020] S4, material removal: remove the formed TPU air nozzle from the movable mold core.

[0021] The beneficial effects of the present invention are as follows: the inner core-pulling seat and the outer core-pulling seat are both slidably arranged on the movable mold seat, and the inner core-pulling seat and the outer core-pulling seat are connected by a first connecting component. During the mold opening process, the outer core-pulling seat pushes the elastic force of the elastic member to separate from the inner core-pulling seat, while the inner core-pulling seat remains stationary and presses the movable mold core, so that the TPU air nozzle performs a core pulling in the mold cavity, so that the core will not move relative to the TPU air nozzle when the TPU air nozzle is pulled and deformed, thereby effectively reducing the adhesion of the TPU air nozzle to the core. Therefore, when the outer core-pulling seat drives the core to move outward for the second core pulling, the core can be smoothly pulled out of the TPU air nozzle, and the TPU air nozzle will not be pulled and deformed due to excessive adhesion of the TPU air nozzle to the core, which facilitates demolding, reduces demolding time, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a TPU air nozzle injection mold of the present invention;

[0023] Figure 2 This is an exploded view of a TPU air nozzle injection mold of the present invention;

[0024] Figure 3 It is a structural diagram of the movable mold and the side core pulling mechanism;

[0025] Figure 4 It is a structural schematic diagram of the outer core-pulling seat;

[0026] Figure 5 It is a structural schematic diagram of the side core pulling mechanism when completing the first core pulling action;

[0027] Figure 6 It is a structural schematic diagram of the side core pulling mechanism when completing the second core pulling action;

[0028] Figure 7 A cross-sectional view of a TPU air nozzle injection mold of the present invention;

[0029] Figure 8 The structure diagram of the fixed mold Figure 1 ;

[0030] Fig. 9 The structure diagram of the fixed mold Figure 2 ;

[0031] Fig.10 It is a structural schematic diagram of the fixed mold core springing outwards under the elastic force of the pressing elastic member.

[0032] Fig.11 This is a schematic structural diagram of a side core pulling mechanism according to another embodiment of the present invention;

[0033] Fig.12 for Fig.11 Enlarged view of part A in .

[0034] Explanation of the reference numerals: 1. movable mold; 11. movable mold seat; 111. guide slide groove; 12. movable mold core; 2. fixed mold; 21. fixed mold seat; 211. second mounting groove; 22. fixed mold core; 23. second connecting assembly; 231. second pull rod; 232. second countersunk hole; 24. clamping elastic member; 3. side core pulling mechanism; 31. inner core pulling seat; 311. first mounting groove; 32. outer core pulling seat; 321. outer core pulling seat body; 322. connecting block; 323. guide protrusion; 33. core; 34. first connecting assembly; 341. first pull rod; 342. first countersunk hole; 35. push elastic member; 36. first connecting assembly; 361. pull tab; 362. separation groove; 363. connecting part; 4. TPU air nozzle. DETAILED DESCRIPTION

[0035] See attached Figures 1 to 12 A TPU air nozzle injection mold of the present invention is further described in detail.

[0036] from Figure 1 and Figure 2It can be seen that a TPU air nozzle injection mold includes a movable mold 1 and a fixed mold 2, wherein the movable mold 1 includes a movable mold seat 11, a movable mold core 12 and a side core pulling mechanism 3 arranged on the side of the movable mold core 12, the fixed mold 2 includes a fixed mold seat 21 and a fixed mold core 22, the side core pulling mechanism 3 includes an inner core pulling seat 31, an outer core pulling seat 32 and a plurality of cores 33, one end of the core 33 is fixed to the outer core pulling seat 32, and the other end passes through the inner core pulling seat 31 and is placed on the movable mold core 12, wherein guide pillars and guide sleeves are respectively installed on the movable mold seat 11 and the fixed mold seat 21 to achieve precise mold closing and mold opening of the movable mold 1 and the fixed mold 2, and an inclined guide pillar is also installed on the fixed mold seat 21 to provide the side core pulling mechanism 3 with the power required for lateral core pulling, and the movable mold 1 can be linked with the side core pulling mechanism 3 when it can move back and forth relative to the fixed mold 2.

[0037] from Figure 3 and Figure 3 It can be known that the inner core pulling seat 31 and the outer core pulling seat 32 are both slidably arranged on the movable mold seat 11, wherein the outer core pulling seat 32 is connected to the inner core pulling seat 31 through the first connecting component 34, and a pushing elastic member 35 is compressed and arranged between the outer core pulling seat 32 and the inner core pulling seat 31; the outer core pulling seat 32 will be separated from the inner core pulling seat 31 under the elastic force of the pushing elastic member 35, and the first connecting component 34 includes a first pull rod 341 and a first countersunk hole 342 opened on the outer core pulling seat 32, one end of the first pull rod 341 is placed in the first countersunk hole 342, and the other end passes through the first countersunk hole 342 and is connected to the inner core pulling seat 31, when the outer core pulling seat 32 moves outward under the action of the inclined guide column to perform the side core pulling process, the outer core pulling seat 32 will be separated from the inner core pulling seat 31 under the elastic force of the pushing elastic member 35, thereby driving the core 33 to perform the first core pulling such as Figure 5 As shown, at this time, the inner core pulling seat 31 remains stationary and still cooperates with the movable mold core 12, and one end of the first pull rod 341 moves toward the bottom of the first countersunk hole 342. When the outer core pulling seat 32 and the inner core pulling seat 31 are separated to the required distance, the pull rod head of the first pull rod 341 abuts against the bottom of the first countersunk hole 342 to limit the movement of the outer core pulling seat 32 relative to the inner core pulling seat 31. At this time, the outer core pulling seat 32 can pull the inner core pulling seat 31 through the first pull rod 341 to move outward and separate from the movable mold core 12, driving the core 33 to perform a second core pulling. Figure 6 shown.

[0038] In order to be able to adjust the installation position of the first pull rod 341 to adjust the separation distance between the outer core pulling seat 32 and the inner core pulling seat 31, the first pull rod 341 can be a bolt, wherein the bolt head is placed in the first countersunk hole 342, and the screw passes through the first countersunk hole 342 and is threadedly connected to the inner core pulling seat 31. By rotating the bolt, the distance between the bolt head and the bottom of the first countersunk hole 342 can be adjusted, thereby adjusting the maximum relative movement distance between the outer core pulling seat 32 and the inner core pulling seat 31.

[0039] The pushing elastic member 35 is a spring, and the inner core-pulling seat 31 is provided with a first mounting groove 311 for mounting the spring. One end of the pushing elastic member 35 is compressed and placed in the first mounting groove 311, and the other end is against the outer core-pulling seat 32, wherein the compression amount of the spring is greater than the maximum relative movement distance between the outer core-pulling seat 32 and the inner core-pulling seat 31, so that the pushing elastic member 35 can provide sufficient elastic force for the outer core-pulling seat 32.

[0040] A guide groove 111 is provided on the movable mold base 11, and a guide protrusion 323 matched with the guide groove 111 is provided on the side wall of the outer core pulling seat 32. The outer core pulling seat 32 can move along the guide groove 111, so that the sliding of the outer core pulling seat 32 is more accurate and reliable. The outer core pulling seat 32 includes an outer core pulling seat body 321 and a connecting block 322 for installing and fixing the core 33. The connecting block 322 is embedded in the outer core pulling seat body 321, so that the connecting block 322 and the outer core pulling seat body 321 can be manufactured with two different materials, which effectively saves manufacturing costs.

[0041] from Figure 7 , Figure 8 and Fig. 9 It can be seen that the fixed mold core 22 is installed on the fixed mold base 21 through the second connecting component 23, and a compression elastic member 24 is compressed and arranged between the fixed mold core 22 and the fixed mold base 21; the fixed mold core 22 will compress the movable mold core 12 under the elastic force of the compression elastic member 24. Fig.10 It can be known that the second connecting component 23 includes a second pull rod 231 and a second countersunk hole 232 opened on the fixed mold seat 21, one end of the second pull rod 231 is placed in the second countersunk hole 232, and the other end passes through the second countersunk hole 232 to be connected with the inner core pulling seat 31. When the movable mold 1 moves away from the fixed mold 2 to open the mold, the fixed mold core 22 will still cooperate with the movable mold core 12 under the elastic force of the clamping elastic member 24, so that the TPU air nozzle 4 is still in the molding cavity, effectively preventing the core 33 from pulling and deforming the TPU air nozzle 4 during the core pulling process. At the same time, one end of the second pull rod 231 will move toward the bottom of the second countersunk hole 232. When one end of the second pull rod 231 abuts against the bottom of the second countersunk hole 232, the core 33 completes the core pulling action, and the second pull rod 231 will limit the movement of the fixed mold core 22, so that the fixed mold core 22 is separated from the movable mold core 12.

[0042] The clamping elastic member 24 is a spring, and the fixed mold base 21 is provided with a second installation groove 211 for installing the spring. One end of the clamping elastic member 24 is compressed and placed in the second installation groove 211, and the other end is against the fixed mold core 22, wherein the compression amount of the spring is greater than the maximum relative movement distance between the fixed mold base 21 and the fixed mold core 22, so that the clamping elastic member 24 can provide sufficient elastic force for the fixed mold core 22.

[0043] In the present invention, both the inner core puller 31 and the outer core puller 32 are slidably arranged on the movable mold base 11, and the inner core puller 31 and the outer core puller 32 are connected by a first connecting component 34. When the movable mold 1 moves away from the fixed mold 2 to open the mold, the fixed mold core 22 will still cooperate with the movable mold core 12 under the elastic force of the pressing elastic member 24; the outer core puller 32 pushes the elastic member 35 to separate from the inner core puller 31, while the inner core puller 31 remains stationary and presses the movable mold core 12, so that the TPU gas The nozzle 4 performs the first core pulling in the cavity, so that the core 33 will not move relative to the TPU air nozzle 4 when the TPU air nozzle 4 is pulled out and deformed, so as to effectively reduce the adhesion of the TPU air nozzle 4 to the core 33. Therefore, when the outer core pulling seat 32 drives the core 33 to move outward for the second core pulling, the core 33 can be smoothly pulled out of the TPU air nozzle 4, and the TPU air nozzle 4 will not be pulled out and deformed due to excessive adhesion of the TPU air nozzle 4 to the core 33, which facilitates demolding, reduces demolding time, and improves production efficiency.

[0044] The present invention also provides another embodiment, which is different from the above technical solution in that the first connecting component has a different structure. Fig.11 and Fig.12 It can be seen that the first connecting component 36 of this embodiment includes a pull tab 361 and a separation groove 362 opened on the inner core pulling seat 31, one end of the pull tab 361 is fixed on the outer core pulling seat 32 by inlaying, and the other end is provided with a connecting portion 363 and is placed in the separation groove 362, and the connecting portion 363 can move back and forth in the separation groove 362. When the outer core pulling seat 32 is separated from the inner core pulling seat 31 and moves outward to the desired position, the connecting portion 363 will abut against the groove wall of the separation groove 362 to limit the movement of the outer core pulling seat 32 relative to the inner core pulling seat 31. At this time, the outer core pulling seat 32 can pull the inner core pulling seat 31 through the pull tab 361 to move outward and separate from the movable mold core 12, thereby driving the core 33 to perform a second core pulling.

[0045] The present invention also provides a TPU air nozzle 4 injection molding method, using the above-mentioned TPU air nozzle 4 injection molding mold, comprising the following steps:

[0046] S1, mold closing: the movable mold 1 moves toward the fixed mold 2, so that the movable mold core 12, the fixed mold core 22 and the side core pulling mechanism 3 cooperate with each other to form a cavity;

[0047] S2, glue injection: inject glue into the mold cavity after mold closing, and keep pressure to cool;

[0048] S3, mold opening: when the plastic injected into the cavity is cooled and formed, the movable mold 1 is pushed to move away from the fixed mold 2, and the fixed mold core 22 will still press the movable mold core 12 under the elastic force of the pressing elastic member 24, and at the same time, the outer core puller 32 will push the elastic member 35 to separate from the inner core puller 31, driving the core 33 to move outward for the first core pull, while the inner core puller 31 still remains stationary and presses the movable mold core 12, so that the core 33 and the TPU air nozzle 4 move relative to each other;

[0049] The movable mold 1 is pushed to continue moving away from the fixed mold 2. The fixed mold core 22 no longer moves forward under the action of the second connecting component 23, and the fixed mold core 22 is separated from the movable mold core 12. At the same time, the outer core puller 32 drives the core 33 to move outward for the second core pull, so that the core 33 is pulled out of the TPU air nozzle 4, and the outer core puller 32 drives the inner core puller 31 to move outward together through the first connecting component 34, so that the inner core puller 31 is separated from the movable mold core 12.

[0050] S4, taking out the material: taking out the formed TPU air nozzle 4 from the movable mold core 12.

[0051] Through the above-mentioned TPU air nozzle 4 injection molding method, the TPU air nozzle 4 performs the first core pulling in the mold cavity, so that the core 33 will not move relative to the TPU air nozzle 4 when the TPU air nozzle 4 is pulled out and deformed, thereby effectively reducing the adhesion of the TPU air nozzle 4 to the core 33. Therefore, when the outer core pulling seat 32 drives the core 33 to move outward for the second core pulling, the core 33 can be smoothly pulled out of the TPU air nozzle 4, which is convenient for demolding, reduces the demolding time, and improves production efficiency.

[0052] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A TPU air nozzle injection mold, comprising a movable mold and a fixed mold, wherein the movable mold comprises a movable mold seat, a movable mold core, and a side core pulling mechanism arranged on the side of the movable mold core, and the fixed mold comprises a fixed mold seat and a fixed mold core, wherein: The side core pulling mechanism comprises an inner core pulling seat, an outer core pulling seat and a plurality of cores, one end of the core is fixed to the outer core pulling seat, and the other end passes through the inner core pulling seat and is placed on the movable mold core; The outer core-pulling seat is connected to the inner core-pulling seat through a first connecting component, and a pushing elastic member is compressed and arranged between the outer core-pulling seat and the inner core-pulling seat. When the mold is opened, the outer core-pulling seat will be separated from the inner core-pulling seat under the elastic force of the pushing elastic member; The fixed mold core is installed on the fixed mold base through a second connecting component, and a pressing elastic member is compressed and arranged between the fixed mold core and the fixed mold base. When the mold is opened, the fixed mold core will press the movable mold core under the elastic force of the pressing elastic member; The pushing elastic member is a spring, the inner core-pulling seat is provided with a first mounting groove for mounting the spring, one end of the pushing elastic member is compressed and placed in the first mounting groove, and the other end abuts against the outer core-pulling seat; The second connecting component includes a second pull rod and a second countersunk hole opened on the fixed mold seat. The pull rod head of the second pull rod is placed in the second countersunk hole, and the other end passes through the second countersunk hole to be connected to the inner core pulling seat. When the fixed mold core is separated from the fixed mold seat and moves forward to the required position, the pull rod head of the second pull rod will abut against the bottom of the second countersunk hole.

2. A TPU air nozzle injection mold according to claim 1, characterized in that: The first connecting component includes a first pull rod and a first countersunk hole opened on the outer core pulling seat. The pull rod head of the first pull rod is placed in the first countersunk hole, and the other end passes through the first countersunk hole to be connected to the inner core pulling seat. When the outer core pulling seat is separated from the inner core pulling seat and moves outward to the desired position, the pull rod head of the first pull rod will abut against the bottom of the first countersunk hole.

3. The TPU air nozzle injection mold according to claim 2, characterized in that: The first pull rod is a bolt, wherein the bolt head is placed in the first countersunk hole, and the screw rod passes through the first countersunk hole and is threadedly connected with the inner core-pulling seat.

4. The TPU air nozzle injection mold according to claim 1, characterized in that: The first connecting component includes a pull tab and a separation groove opened on the inner core pulling seat. One end of the pull tab is fixed on the outer core pulling seat, and the other end is provided with a connecting portion and placed in the separation groove. When the outer core pulling seat is separated from the inner core pulling seat and moves outward to the desired position, the connecting portion will abut against the groove wall of the separation groove.

5. A TPU air nozzle injection mold according to claim 1, 2 or 3, characterized in that: The outer core-pulling seat comprises an outer core-pulling seat body and a connecting block for installing and fixing the core, and the connecting block is embedded in the outer core-pulling seat body.

6. The TPU air nozzle injection mold according to claim 1, characterized in that: The clamping elastic member is a spring, and the fixed mold seat is provided with a second installation groove for installing the spring. One end of the clamping elastic member is compressed and placed in the second installation groove, and the other end is against the fixed mold core.

7. A TPU air nozzle injection molding method, characterized in that: The TPU air nozzle injection mold according to any one of claims 1 to 6 is used, comprising the following steps: S1. Mold closing: The movable mold moves toward the fixed mold, so that the movable mold core, the fixed mold core and the side core pulling mechanism cooperate with each other to form a cavity; S2, glue injection: inject glue into the mold cavity after mold closing, and keep pressure to cool; S3, mold opening: when the plastic injected into the cavity is cooled and formed, the movable mold is pushed to move away from the fixed mold, and the fixed mold core will still press the movable mold core under the elastic force of the pressing elastic member, and at the same time, the outer core puller will push the elastic member to separate from the inner core puller under the elastic force of the elastic member, driving the core to move outward for the first core pull, while the inner core puller still remains stationary and presses the movable mold core, so that the core and the TPU air nozzle move relative to each other; The movable mold is pushed away from the fixed mold to continue moving. The fixed mold core no longer moves forward under the action of the second connecting component, and the fixed mold core is separated from the movable mold core. At the same time, the outer core puller drives the core to move outward for the second core pull, so that the core is pulled out of the TPU air nozzle, and the outer core puller drives the inner core puller to move outward together through the first connecting component, so that the inner core puller is separated from the movable mold core. S4, material removal: remove the formed TPU air nozzle from the movable mold core.

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