Cream bottle and production process thereof

Abstract

According to the technical scheme, the cream bottle is characterized by comprising a wide-mouth-shaped bottle body with an air hole in the bottom, an inner bottle is detachably arranged in the bottle body, a vacuum pump assembly is installed at the position of a bottle mouth of the inner bottle, and a piston assembly is arranged in an inner cavity of the inner bottle in a sliding mode. The piston assembly is inserted through an installation opening in the bottom of the inner bottle, the bottom of the inner bottle and the piston assembly are connected through a connecting piece, the connecting piece is used for enabling the piston assembly to be fixed in place after sliding to a bottle opening of the inner bottle, and therefore smooth discharging is guaranteed. The design of the connecting piece facilitates disassembly and replacement of the inner bottle, and a user can conveniently clean or replace the inner bottle. The piston assembly is attached to the inner wall of the inner bottle in a sealed mode, it is guaranteed that cream is not polluted, and the cream bottle is reasonable in structural design, convenient to use, high in sealing performance and good in detachability.

Description

Technical Field

[0001] The invention relates to the technical field of cosmetic packaging bottles, and in particular to a cream bottle and a production process thereof. Background Art

[0002] A cream bottle is a container used to store cream-type skin care products. In order to ensure that the contents stored in the cream bottle do not come into contact with the air and be oxidized, vacuum cream bottles are commonly used to store skin care products on the market. Vacuum cream bottles can preserve the contents through vacuum technology, prevent oxidation, contamination and external contact, thereby extending the service life of the product.

[0003] Existing vacuum cream bottles usually include a bottle body and an inner liner for storing contents, wherein the bottom of the inner liner is in an open state and is connected to a piston assembly, and a vacuum pump assembly is arranged on the top of the inner liner. The vacuum pump assembly can maintain a vacuum state in the inner liner and pump out the contents in the inner liner, and the piston assembly can squeeze the contents in the inner liner toward the vacuum pump assembly under the action of external atmospheric pressure so as to squeeze out the product.

[0004] In order to allow the piston assembly to work properly, a through hole connected to the inner liner must be opened on the bottle body to ensure that the piston assembly is in contact with the outside air. This results in the bottom of some existing inner liners being completely connected to the bottom of the bottle body and being integrally formed, so that the inner liner cannot be replaced and reused; and in an insert-replaceable cream bottle disclosed in patent No. (202420034736.X), in order to facilitate the replacement of the inner liner, the piston assembly is placed inside the inner liner and an air hole connected to the outside is opened at the bottom of the inner liner; but this makes it impossible to remove the piston assembly located in the inner liner. Each time the inner liner is replaced, the piston assembly needs to be replaced as well, which increases the cost. Summary of the invention

[0005] The invention provides a cream bottle and a production process thereof, which solves the problem that the inner liner of the existing cream bottle is difficult to replace and the replacement cost is high.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a cream bottle, including a bottle body with an air hole at the bottom and a wide mouth, an inner bottle is detachably arranged in the bottle body, a vacuum pump assembly is arranged at the bottle mouth of the inner bottle, a piston assembly is slidably arranged in the inner cavity of the inner bottle, a mounting port is arranged at the bottom of the inner bottle, the piston assembly is inserted into the inner cavity of the inner bottle through the mounting port, a connecting piece is arranged between the piston assembly and the bottle body, and the connecting piece is used to make the piston assembly slide to the bottle mouth of the inner bottle and then be fixed relative to the bottle body.

[0007] The present invention is further configured such that the connecting member includes a positioning rod connected to the bottom of the bottle body, the positioning rod is hollow, and one end thereof away from the bottom of the bottle body is slidably provided with a limiting rod whose end is connected to the bottom of the piston assembly.

[0008] The present invention is further configured such that the piston assembly includes a piston body fixedly connected to a limiting rod, a sealing component that fits the inner wall of the inner bottle is arranged on the circumference of the piston body, and the sealing component includes a sealing gasket arranged on the top of the piston body and an inflatable gasket located below the sealing gasket.

[0009] The present invention is further configured such that the inner diameter of the mounting port is larger than the inner diameter of the inner bottle, the inner wall of the mounting port is provided with a driving thread, a plurality of thread blocks are slidably provided at the bottom of the piston body, the plurality of thread blocks are circumferentially distributed at the bottom of the piston body and form a thread ring of an annular structure, a thread structure matching the driving thread is provided on the outer side of the thread ring; an abutment spring is also provided between the thread block and the piston body for driving the thread block to abut and cooperate with the driving thread.

[0010] The present invention is further configured such that a buffer portion is provided between the inner cavity of the inner bottle and the mounting opening, and the inner diameter of the buffer portion gradually decreases from the mounting opening toward the inner cavity of the inner bottle.

[0011] The present invention is further configured as follows: the vacuum pump assembly includes a sealing plate arranged at the mouth of the inner bottle, a pump barrel connected to the inner cavity of the inner bottle is arranged in the middle of the sealing plate, a feed port is arranged at one end of the pump barrel close to the piston assembly, and the feed port is provided with a one-way valve for allowing the material to flow from the inner cavity of the inner bottle to the pump barrel; a connecting port is arranged at one end of the pump barrel away from the piston assembly, a pressure cover is slidably arranged at the connecting port, a discharge port connected to the inside of the pump barrel is arranged on the pressure cover, and a sealing plug is arranged at the discharge port; a return spring is abutted between the pressure cover and the sealing plate.

[0012] The present invention is further configured such that the pressure cover includes an extrusion cylinder with a sliding rod arranged in the pump cylinder, a sealing ring is arranged on the outer side of the circumference of the extrusion cylinder and is in contact with the inner wall of the pump cylinder, and a separation head is also arranged on one end of the extrusion cylinder facing the pump cylinder and is in contact with the inner wall of the pump cylinder and has a conical cross-section, and the separation head is used to scrape the inner wall of the pump cylinder when the extrusion cylinder moves.

[0013] The present invention is further configured such that a guide head with a conical cross section is arranged in the extrusion barrel, one end of the guide head corresponds to the position of the discharge port and the inner diameter of the guide head gradually decreases from one end of the pump barrel to one end of the discharge port.

[0014] 9. A cream bottle production process, used to make a cream bottle, the steps are as follows: S1. Material selection: Polypropylene is used as the material of the bottle body and inner bottle, ABS plastic is used as the material of the piston assembly and vacuum pump assembly, and food-grade silicone is used as the material of the sealing component; S2. Mold design and manufacturing: Design injection molds according to components; S3, injection molding: heating and melting the material selected in S1, and injecting it into the mold designed in S2 through an injection molding device for molding, and obtaining the components of each component after cooling and demolding; S4, component assembly: assembling the components prepared in S3 to obtain a finished product; S5. Quality inspection: Conduct quality inspection on the assembled cream bottles, including sealing test, piston sliding test, vacuum pump function test and appearance quality test to ensure the quality of the finished product; S6. Cleaning and disinfection: The cream bottles that have passed the inspection are first cleaned by ultrasonic wave and then disinfected by ultraviolet irradiation; S7, Packaging: Pack the products that have been cleaned and disinfected in S6 individually or in batches.

[0015] The present invention is further configured that the assembly steps of S4 are as follows: A: First, connect one end of the connector to the bottom of the bottle body and the other end to the piston assembly, and place the piston assembly in the bottle body. During this process, the sealing component must be assembled with the piston assembly first, and then the subsequent assembly can be carried out; B: Then insert the inner bottle into the bottle body, and make the mounting port of the inner bottle correspond to the piston assembly, so that the piston assembly is inserted into the inner bottle through the mounting port, and then rotate the inner bottle to make the inner bottle and the piston assembly rotate relative to each other, so that the piston assembly is completely rotated to be out of the mounting port and abut against the inner wall of the inner bottle; C: Assemble the vacuum pump assembly first, and then install the vacuum pump assembly to the mouth of the inner bottle to complete the overall installation.

[0016] In summary, the beneficial effects of the present invention are: Compared with the prior art, the present application adopts a detachable inner bottle and bottle body structure, making it simple and quick to replace the inner bottle, and the user can use the outer bottle multiple times, thereby improving the sustainability of the product and reducing packaging waste. A connector is provided between the piston and the bottom of the bottle body, making the sliding of the piston assembly in the inner bottle more stable, and through the design of the connector, when the user replaces the inner bottle, the piston can be fixed in the bottle body, so that the piston assembly can be easily removed from the inner bottle. This structure not only simplifies the disassembly and replacement operations, but also ensures that the piston assembly can be smoothly loaded and unloaded through the installation port at the bottom of the inner bottle, thereby improving the maintainability and convenience of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram of an explosion of a cream bottle.

[0018] Figure 2 This is a schematic diagram of the disassembled cream bottle.

[0019] Figure 3 This is a cross-sectional diagram of a cream bottle.

[0020] Figure 4 It is a three-dimensional structural diagram of the piston assembly.

[0021] Figure 5 yes Figure 3 Enlarged view of point A.

[0022] Figure 6 This is a partial structural diagram of the piston assembly.

[0023] Figure numerals: 1. bottle body; 2. inner bottle; 21. inner cavity; 22. bottle mouth; 23. installation port; 24. driving thread; 25. buffer part; 3. bottle cap; 4. vacuum pump assembly; 41. sealing plate; 42. pump barrel; 43. feed port; 44. one-way valve; 45. connecting port; 46. pressure cover; 47. discharge port; 48. sealing plug; 49. reset spring; 5. piston assembly; 51. piston body; 52. sealing gasket; 53. inflatable gasket; 54. threaded block; 55. abutment spring; 6. connecting piece; 61. positioning rod; 62. limiting rod; 7. extrusion cylinder; 8. separation head; 9. guide head. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention. Embodiment 1

[0025] like Figure 1-6 As shown, this embodiment discloses a cream bottle, including a bottle body 1 with air holes at the bottom and in a wide-mouth shape, an inner bottle 2 detachably arranged in the bottle body 1, the inner bottle 2 is plugged into the bottle body 1, and a vacuum pump assembly 4 is arranged at the bottle mouth 22 of the inner bottle 2, the vacuum pump assembly 4 can discharge the substance filled in the inner bottle 2 to the outside for use, and a piston assembly 5 is slidably arranged in the inner cavity 21 of the inner bottle 2, the piston assembly 5 can ensure the vacuum in the inner bottle 2, so as to ensure that the substance in the inner bottle 2 will not be oxidized and deteriorated by contact with the air. On the bottle body 1, a bottle cap 3 is also provided, which can play a dust-proof role for the vacuum pump assembly 4, so as to prevent the pump head of the vacuum pump assembly 4 from being contaminated by dust and affecting its use.

[0026] like Figure 1-2 As shown, a mounting port 23 is provided at the bottom of the inner bottle 2, and the piston assembly 5 is inserted into the inner cavity 21 of the inner bottle 2 through the mounting port 23. A connecting member 6 is provided between the piston assembly 5 and the bottle body 1, and the connecting member 6 includes a positioning rod 61 connected to the bottom of the bottle body 1. The positioning rod 61 is hollow, and a limiting rod 62 whose end is connected to the bottom of the piston assembly 5 is slidably provided at one end away from the bottom of the bottle body 1.

[0027] Among them, the positioning rod 61 is fixed at the bottom of the bottle body 1, and is connected to the bottle body 1 through a thread, and the limiting rod 62 is slidably arranged in the positioning rod 61, and the end of the limiting rod 62 away from the positioning rod 61 is fixedly connected to the piston assembly 5 through a thread or glue, and there can be multiple limiting rods 62 and they are hollow, so that the number of limiting rods 62 can be adjusted according to the movement stroke of the piston assembly 5; when the user needs to replace the used inner bottle 2, the user disassembles the vacuum pump and pulls the inner bottle 2 out of the bottle body 1. In the process of pulling out the inner bottle 2, since the piston assembly 5 is fixed by the limiting rod 62, the user can directly separate the inner bottle 2 from the piston assembly 5, thereby facilitating the disassembly of the inner bottle 2, without replacing the piston assembly 5, reducing waste and reducing production costs.

[0028] like Figure 3-6 As shown, the inner diameter of the mounting port 23 is larger than the inner diameter of the inner bottle 2, and a driving thread 24 is provided on the inner wall of the mounting port 23. A plurality of thread blocks 54 are slidably provided at the bottom of the piston body 51 of the piston assembly 5. The plurality of thread blocks 54 are circumferentially distributed at the bottom of the piston body 51 and form a thread ring of an annular structure, and a thread structure matching with the driving thread 24 is provided on the outer side of the thread ring; an abutment spring 55 is also provided between the thread block 54 and the piston body 51, for the driving thread 24 block to abut and cooperate with the driving thread 24.

[0029] A buffer portion 25 is provided between the inner cavity 21 of the inner bottle 2 and the mounting opening 23 , and the inner diameter of the buffer portion 25 gradually decreases from the mounting opening 23 toward the inner cavity 21 of the inner bottle 2 .

[0030] When the staff needs to insert the piston body 51 into the inner bottle 2 to make it fit with the inner wall of the inner bottle 2, due to the large friction between the piston body 51 and the inner wall of the inner bottle 2, if brute force is used to squeeze it, it requires a lot of force and it is easy to cause the piston body 51 to tilt, affecting normal use.

[0031] By means of the driving thread 24 provided at the installation opening 23 and the threaded ring composed of a plurality of threaded blocks 54 provided at the bottom of the piston body 51, after the piston body 51 is inserted into the installation opening 23, the piston body 51 will first be located at the buffer portion 25, at which time the threaded ring will abut against the driving thread 24 at the installation opening 23, and then the staff will rotate the inner bottle 2, and through the cooperation of the threaded ring and the driving thread 24, the piston body 51 will gradually slide into the inner bottle 2, so that the piston body 51 can slide smoothly into the inner bottle 2, thereby preventing the piston body 51 from tilting during the installation process. At the same time, during disassembly, by rotating the inner bottle 2, it can also be separated from the piston body 51, thereby facilitating disassembly and assembly.

[0032] There is an abutment spring 55 between the thread block 54 and the piston body 51, which can drive the thread block 24 to slide outward and abut against the driving thread 24 to ensure stable cooperation between the threads. When the piston body 51 slides to the inner cavity 21 of the inner bottle 2, due to the extrusion of the inner wall of the inner bottle 2, the thread block 54 will slide toward the piston body 51 to ensure stable and smooth sliding of the piston body 51 in the inner bottle 2.

[0033] like Figure 4-6 As shown, the piston assembly 5 includes a piston body 51 fixedly connected to the limiting rod 62, and a sealing component that fits the inner wall of the inner bottle 2 is arranged on the circumference of the piston body 51. The sealing component includes a sealing gasket 52 arranged on the top of the piston body 51 and an inflatable gasket 53 located below the sealing gasket 52.

[0034] The sealing gasket 52 arranged on the side of the piston body 51 can ensure the seal between the piston body 51 and the inner bottle 2, ensuring that the cream will not be exposed to air and deteriorate, and at the same time allow the piston body 51 to scrape the cream on the inner wall of the inner bottle 2 during movement, thereby reducing the waste of cream.

[0035] The inflatable gasket 53 arranged around the piston body 51 is arranged below the sealing gasket 52, which further enhances the sealing performance and plays a buffering role. When the piston assembly 5 slides, it can ensure that the piston fits tightly against the inner wall of the inner bottle 2.

[0036] And as Figure 3As shown, the vacuum pump assembly 4 includes a sealing plate 41 arranged at the bottle mouth 22 of the inner bottle 2, a pump barrel 42 connected to the inner cavity 21 of the inner bottle 2 is arranged in the middle of the sealing plate 41, and a feed port 43 is arranged at one end of the pump barrel 42 close to the piston assembly 5, and the feed port 43 is provided with a one-way valve 44 for allowing the material to flow from the inner cavity 21 of the inner bottle 2 to the pump barrel 42; a connecting port 45 is arranged at one end of the pump barrel 42 away from the piston assembly 5, a pressure cover 46 is slidably arranged at the connecting port 45, a discharge port 47 connected to the inside of the pump barrel 42 is arranged on the pressure cover 46, and a sealing plug 48 is arranged at the discharge port 47; a return spring 49 is abutted between the pressure cover 46 and the sealing plate 41.

[0037] When the user needs to take the cream in the inner bottle 2, the user first presses the pressure cap 46. Pressing the pressure cap 46 downward will squeeze the cream in the pump barrel 42, so that the cream in the pump barrel 42 is discharged toward the discharge port 47, thereby opening the sealing plug 48 at the discharge port 47 to enable the cream to be taken. When the user loosens the pressure cap 46, the pressure cap 46 will move upward under the action of the return spring 49. During the movement, the air in the pump barrel 42 will be extracted, so that the pump barrel 42 will be in a vacuum, thereby opening the one-way valve 44 at the feed port 43, and then allowing the cream in the inner bottle 2 to enter the pump barrel 42 through the feed port 43; the preparation of the cream is achieved, and it is ensured that each press can accurately control the discharge amount while avoiding the backflow of the cream.

[0038] The pressure cap 46 includes an extrusion barrel 7 with a sliding rod arranged in the pump barrel 42, and a sealing ring is arranged on the outer side of the circumference of the extrusion barrel 7, which fits the inner wall of the pump barrel 42. The setting of the sealing ring can form a piston structure between the extrusion barrel 7 and the pump barrel 42, so that when the extrusion barrel 7 moves upward under the action of the pressure cap 46, it can play a role in evacuating the pump barrel 42, so that the cream in the inner bottle 2 can smoothly enter the pump barrel 42 and reduce the contact with the air; and the end of the extrusion barrel 7 facing the pump barrel 42 is also provided with a separation head 8 that fits the inner wall of the pump barrel 42 and has a conical cross-section. The separation head 8 is used to move the extrusion barrel 7 upward. The inner wall of the pump barrel 42 is scraped while the extruder 7 is used to reduce the residual cream in the pump barrel 42 and reduce waste. A guide head 9 with a conical cross-section is provided in the extruder 7, one end of the guide head 9 corresponds to the position of the discharge port 47 and the inner diameter of the guide head 9 gradually decreases from one end of the pump barrel 42 to the other end of the discharge port 47. The conical guide head 9 can effectively guide the cream to flow from the pump barrel 42 to the discharge port 47, ensuring smooth and uniform discharge and reducing the problem of jamming of the cream during the discharge process. Therefore, for some creams with higher viscosity, it can also ensure that the cream can be squeezed out normally through the discharge port 47.

[0039] Working principle: Figure 3As shown, when the staff needs to take the cream, they first open the bottle cap 3, and the bottle cap 3 and the bottle body 1 are attracted to each other by magnets to ensure that the connection between the bottle cap 3 and the bottle body 1 is firm. Then the user presses the pressure cap 46, and the pressure cap 46 will overcome the force of the return spring 49 to drive the extrusion cylinder 7 to slide to the bottom of the pump cylinder 42. During the sliding process, since the feed port 43 of the pump cylinder 42 is provided with a one-way valve 44, the feed port 43 will be in a closed state during this process, thereby preventing the cream in the pump cylinder 42 from flowing back. During the downward pressing of the extrusion cylinder 7, the cream in the pump cylinder 42 will act in the direction of the discharge port 47. Under the pressure of the cream, the sealing plug 48 at the discharge port 47 will be opened, so that the cream can be squeezed out for use; then the pressure cap 46 is released, and the pressure The cover 46 and the extrusion cylinder 7 will be reset under the action of the reset spring 49. During the upward movement of the extrusion cylinder 7, the pump cylinder 42 will be in a negative pressure state, thereby allowing the one-way valve 44 of the feed port 43 to open, allowing the material in the inner bottle 2 to flow into the pump cylinder 42, which is used as a preparation for the next cream, ensuring the accuracy of the amount of each press; and in this process, the sealing plug 48 will re-seal the discharge port 47 under the action of pressure, thereby ensuring that the cream in the pump cylinder 42 is in a vacuum storage state to avoid oxidation due to contact with air; at the same time, the inner bottle 2 is in a vacuum state, and since the cream therein is delivered to the pump cylinder 42, the piston body 51 will move toward the inner bottle 2 under the external atmospheric pressure, and squeeze the cream toward the vacuum pump for easy use next time. Embodiment 2

[0040] A cream bottle production process is used to make the cream bottle in Example 1, and the steps are as follows: S1. Material selection: Polypropylene material is used as the material of the bottle body 1 and the inner bottle 2, ABS plastic is used as the material of the piston assembly 5 and the vacuum pump assembly 4, and food-grade silicone is used as the material of the sealing component; The material is polypropylene, which is light, durable, and stable to cosmetic ingredients, and can ensure the safety of the cream inside; the piston body 51 and the vacuum pump assembly 4 are made of ABS plastic, which has high hardness and strength, can avoid wear and tear, making it more durable; the sealing parts are made of sealing gaskets 52 and inflatable gaskets 53, and use food-grade silicone to ensure their durability and sealing performance.

[0041] S2. Mold design and manufacturing: Design injection molds according to components; S3, injection molding: heating and melting the material selected in S1, and injecting it into the mold designed in S2 through an injection molding device for molding, and obtaining the components of each component after cooling and demolding; S4, component assembly: Assemble the components prepared in S3 to obtain a finished product. The specific assembly steps are as follows: A: First, connect one end of the connector 6 to the bottom of the bottle body 1 and the other end to the piston assembly 5, and place the piston assembly 5 in the bottle body 1. During this process, the sealing component must be assembled with the piston assembly 5 first, and then the subsequent assembly is performed; B: Then insert the inner bottle 2 into the bottle body 1, and make the mounting opening 23 of the inner bottle 2 correspond to the piston assembly 5, so that the piston assembly 5 is inserted into the inner bottle 2 through the mounting opening 23, and then rotate the inner bottle 2 to make the inner bottle 2 and the piston assembly 5 rotate relative to each other, so that the piston assembly 5 is completely rotated to be out of the mounting opening 23 and abut against the inner wall of the inner bottle 2; C: First assemble the vacuum pump assembly 4, and then install the vacuum pump assembly 4 to the bottle mouth 22 of the inner bottle 2 to complete the overall installation.

[0042] S5. Quality inspection: Conduct quality inspection on the assembled cream bottles, including sealing test, piston sliding test, vacuum pump function test and appearance quality test to ensure the quality of the finished product; Among them, the sealing test: testing the sealing performance inside the bottle by vacuuming or injecting water to ensure that air cannot enter the bottle, and checking whether the sealing between the piston assembly 5 and the wall of the inner bottle 2 meets the standards.

[0043] Piston sliding performance test: Test the sliding smoothness of the piston in the bottle to ensure that the performance of the telescopic connector 6 meets the design requirements and that the piston does not get stuck or tilt during use.

[0044] Vacuum pump performance test: Perform a pressure test on the vacuum pump to ensure that the cream can be squeezed out smoothly each time it is pressed, and test the rebound ability and sealing of the pump head.

[0045] Appearance quality inspection: Check the appearance of each component, especially the bottle body 1, bottle mouth 22, pump head and other positions, to ensure that the surface is smooth and free of defects, there is no deformation at the thread, and there is no obvious scratch on the bottle body.

[0046] S6. Cleaning and disinfection: The cream bottles that have passed the inspection are first cleaned by ultrasonic wave and then disinfected by ultraviolet irradiation; S7, Packaging: Pack the products that have been cleaned and disinfected in S6 individually or in batches.

[0047] The present invention is further configured that the assembly steps of S4 are as follows: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A cream bottle, comprising a bottle body (1) with air holes at the bottom and in a wide-mouth shape, wherein an inner bottle (2) is detachably arranged in the bottle body (1), a vacuum pump assembly (4) is arranged at the bottle mouth (22) of the inner bottle (2), and a piston assembly (5) is slidably arranged in the inner cavity (21) of the inner bottle (2), characterized in that: The bottom of the inner bottle (2) is provided with a mounting opening (23), and the piston assembly (5) is inserted into the inner cavity (21) of the inner bottle (2) through the mounting opening (23). A connecting piece (6) is provided between the piston assembly (5) and the bottle body (1), and the connecting piece (6) is used to enable the piston assembly (5) to slide to the bottle opening (22) of the inner bottle (2) and then be fixed relative to the bottle body (1).

2. A cream bottle according to claim 1, characterized in that: The connecting member (6) comprises a positioning rod (61) connected to the bottom of the bottle body (1); the positioning rod (61) is hollow and has a limiting rod (62) slidably disposed at one end thereof away from the bottom of the bottle body (1) and having an end connected to the bottom of the piston assembly (5).

3. A cream bottle according to claim 1, characterized in that: The piston assembly (5) comprises a piston body (51) fixedly connected to a limit rod (62); a sealing component is arranged on the circumference of the piston body (51) and is in contact with the inner wall of the inner bottle (2); the sealing component comprises a sealing gasket (52) arranged on the top of the piston body (51) and an inflatable gasket (53) located below the sealing gasket (52).

4. A cream bottle according to claim 3, characterized in that: The inner diameter of the mounting opening (23) is larger than the inner diameter of the inner bottle (2); a driving thread (24) is arranged on the inner wall of the mounting opening (23); a plurality of thread blocks (54) are slidably arranged at the bottom of the piston body (51); the plurality of thread blocks (54) are circumferentially distributed at the bottom of the piston body (51) and form a thread ring of an annular structure; a thread structure matching the driving thread (24) is arranged on the outer side of the thread ring; and an abutting spring (55) is further arranged between the thread block (54) and the piston body (51) for abutting and matching the driving thread block (24) with the driving thread (24).

5. A cream bottle according to claim 4, characterized in that: A buffer portion (25) is provided between the inner cavity (21) of the inner bottle (2) and the mounting opening (23), and the inner diameter of the buffer portion (25) gradually decreases from the mounting opening (23) toward the inner cavity (21) of the inner bottle (2).

6. A cream bottle according to any one of claims 1 to 5, characterized in that: The vacuum pump assembly (4) comprises a sealing plate (41) arranged at the mouth (22) of the inner bottle (2); a pump barrel (42) communicating with the inner cavity (21) of the inner bottle (2) is arranged in the middle of the sealing plate (41); a feed port (43) is arranged at one end of the pump barrel (42) close to the piston assembly (5); the feed port (43) is provided with a one-way valve (44) for allowing material to flow from the inner cavity (21) of the inner bottle (2) to the pump barrel (42); a connecting port (45) is arranged at one end of the pump barrel (42) away from the piston assembly (5); a pressure cover (46) is slidably arranged at the connecting port (45); a discharge port (47) communicating with the interior of the pump barrel (42) is arranged on the pressure cover (46); a sealing plug (48) is arranged at the discharge port (47); a return spring (49) is abutted between the pressure cover (46) and the sealing plate (41).

7. A cream bottle according to claim 6, characterized in that: The gland (46) comprises an extrusion barrel (7) with a sliding rod arranged in the pump barrel (42); a sealing ring is arranged on the outer side of the circumference of the extrusion barrel (7) and is in contact with the inner wall of the pump barrel (42); and a separation head (8) is arranged on the end of the extrusion barrel (7) facing the pump barrel (42) and is in contact with the inner wall of the pump barrel (42) and has a conical cross-section. The separation head (8) is used to scrape the inner wall of the pump barrel (42) when the extrusion barrel (7) moves.

8. The cream bottle according to claim 7, characterized in that: A guide head (9) having a conical cross section is arranged in the extrusion barrel (7), one end of the guide head (9) corresponds to the position of the discharge port (47), and the inner diameter of the guide head (9) gradually decreases from one end of the pump barrel (42) to one end of the discharge port (47).

9. A process for producing a cream bottle, used for producing the cream bottle as claimed in any one of claims 1 to 8, characterized in that: Here are the steps: S1. Material selection: Polypropylene is used as the material of the bottle body and inner bottle, ABS plastic is used as the material of the piston assembly and vacuum pump assembly, and food-grade silicone is used as the material of the sealing component; S2. Mold design and manufacturing: Design injection molds according to components; S3, injection molding: heating and melting the material selected in S1, and injecting it into the mold designed in S2 through an injection molding device for molding, and obtaining the components of each component after cooling and demolding; S4, component assembly: assembling the components prepared in S3 to obtain a finished product; S5. Quality inspection: Conduct quality inspection on the assembled cream bottles, including sealing test, piston sliding test, vacuum pump function test and appearance quality test to ensure the quality of the finished product; S6. Cleaning and disinfection: The cream bottles that have passed the inspection are first cleaned by ultrasonic wave and then disinfected by ultraviolet irradiation; S7, Packaging: Pack the products that have been cleaned and disinfected in S6 individually or in batches.

10. A cream bottle production process according to claim 9, characterized in that: The assembly steps of S4 are as follows: A: First, connect one end of the connector to the bottom of the bottle body and the other end to the piston assembly, and place the piston assembly in the bottle body. During this process, the sealing component must be assembled with the piston assembly first, and then the subsequent assembly can be carried out; B: Then insert the inner bottle into the bottle body, and make the mounting port of the inner bottle correspond to the piston assembly, so that the piston assembly is inserted into the inner bottle through the mounting port, and then rotate the inner bottle to make the inner bottle and the piston assembly rotate relative to each other, so that the piston assembly is completely rotated to be out of the mounting port and abut against the inner wall of the inner bottle; C: Assemble the vacuum pump assembly first, and then install the vacuum pump assembly to the mouth of the inner bottle to complete the overall installation.

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