CN113291613B

CN113291613B - Food packaging bottle with expiration prompt function

Info

Publication number: CN113291613B
Application number: CN202110574075.0A
Authority: CN
Inventors: 李留华
Original assignee: Hebei Derong Plastic Packaging Products Co ltd
Current assignee: Hebei Derong Plastic Packaging Products Co ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2022-11-11
Anticipated expiration: 2041-05-25
Also published as: CN113291613A

Abstract

The invention discloses a food packaging bottle with an expiration prompting function, which comprises a bottle body and a cover, wherein yoghourt is filled in the bottle body, the bottle opening of the bottle body is closed by a sealing film, and the cover comprises a main body part and an interlayer part; the main body part comprises a central body and a shell, the central body is positioned above the sealing film, the bottom of the central body is provided with a puncture sheet, a channel and a valve are arranged in the central body, the shell wraps the periphery of the central body, a cavity communicated with the channel is arranged in the shell, the surface of the cavity is sealed by a spacer, and a feedback unit is arranged in the cavity; the sandwich portion is located between the central body and the shell. When the cover is opened, the shell is pressed downwards and then rotated, the sealing film is punctured by the puncturing sheet in the process, then a mouth is cut, if the yoghourt in the bottle body is deteriorated, gas generated by deterioration can push the valve open and flow into the channel, and then the feedback unit in the cavity is changed, so that when the yoghourt is not beyond the shelf life but is deteriorated, a prompt can be obtained from the cover when the cover is opened, and the yoghourt is prevented from being eaten by mistake.

Description

Food packaging bottle with expiration prompt function

Technical Field

The invention relates to the field of food packaging, in particular to a food packaging bottle with an expiration prompting function.

Background

Yogurts are classified into low-temperature yogurts and normal-temperature yogurts, wherein the low-temperature yogurts generally require refrigeration storage to control the activity of lactic acid bacteria because they contain a large amount of viable lactic acid bacteria, because they lose their activity in advance by continuous fermentation at normal or high temperature, finally deteriorate and generate gas. For example, the shelf life of low-temperature yogurt can reach two to three weeks in an environment of 2 to 6 degrees celsius, but yogurt may be deteriorated after several hours because lactic acid bacteria are continuously fermented in a normal or high temperature environment.

It is known that the production date and shelf life of the outer package are marked at the time of shipment, so that if the low-temperature yogurt is not stored in a low-temperature environment as required after shipment, the yogurt may not exceed the shelf life but actually deteriorate. And the eater usually judges whether the yogurt is overdue or not only according to the production date and the shelf life of the outer package, so that the eater is very likely to eat deteriorated yogurt by mistake in the case.

In view of the above, the applicant has improved a packaging bottle for low-temperature yogurt and applied for a related patent (application number: 202110470534.0), and when the packaging bottle is opened, if the yogurt in the bottle body is deteriorated, a corresponding prompt is provided on the cap, so that when the package bottle is opened, a user can judge whether the yogurt is deteriorated according to the prompt on the cap, so as to avoid eating the deteriorated yogurt by mistake. However, in the packaging bottle, the indication that the yoghourt is deteriorated by the cover is displayed at the bottom of the cover, and the bottom of the cover is not noticed by a user sometimes, so that the problem that the indication is not obvious enough exists.

Disclosure of Invention

The invention aims to improve a packaging bottle for low-temperature yoghourt, and after improvement, when the yoghourt is deteriorated, a change prompt can be displayed by a cover by using gas generated by deterioration on one hand, and on the other hand, the displayed position is positioned on the upper surface of the cover so as to be convenient for a user to notice.

In order to achieve the purpose, the invention provides a food packaging bottle with an expiration prompting function, which is used for packaging yoghourt and comprises a bottle body and a cover, wherein the bottle opening of the bottle body is closed by a sealing film, the periphery of the bottle opening is provided with external threads, and the cover comprises a main body part and an interlayer part;

the body portion includes a central body and a housing; the central body is positioned above the sealing film and is cylindrical, a puncture piece for cutting the sealing film is arranged at the bottom of the central body, a circle of convex edges are arranged on the periphery of the central body, and an overdue prompting unit is arranged in the central body, wherein the overdue prompting unit comprises a passage and a valve, the passage extends from the bottom of the central body to the upper part of the central body, the valve is arranged in the passage, the valve is closed or opened to block or open the circulation of the passage, and when the air pressure below the valve exceeds a preset value, the valve can be pushed by the air pressure to be opened; the shell comprises a top surface and a ring surface, wherein the top surface is positioned above the central body and is connected with the central body into a whole, a concave cavity is formed on the upper surface of the top surface and is communicated with the channel, the top of the cavity is sealed by a spacer, a feedback unit is arranged in the cavity, when gas enters the cavity from the valve, the feedback unit changes, the ring surface surrounds the periphery of the central body and keeps a distance from the central body, and the ring surface is connected with the top surface into a whole; in addition, in a natural state, the valve is in a closed state, gas below the valve cannot enter the channel above the valve, the feedback unit cannot change at the moment, when the valve is opened and gas below the valve enters the channel above the valve, the feedback unit changes at the moment, and the change of the feedback unit can be observed from the outer side of the spacer;

the sandwich part is a hollow cylinder structure and is positioned between the central body and the ring surface of the shell, gaps are kept between the sandwich part and the ring surfaces of the central body and the shell, the bottom of the sandwich part is connected with the external thread of the bottle mouth through internal threads, the inner wall of the sandwich part is provided with a first annular groove and a second annular groove which allow the convex edge of the central body to be clamped into the first annular groove and the second annular groove, the first annular groove is positioned above the second annular groove, the convex edge of the central body is clamped in the first annular groove, the central body cannot be separated from the sandwich part at the moment, but can freely rotate in the sandwich part, and when the central body moves downwards to the convex edge to be clamped in the second annular groove, the sandwich part can rotate together when the central body rotates.

The invention is designed based on the following concept: because the low-temperature yoghourt can deteriorate in advance and generate a large amount of gas when being stored improperly, whether the yoghourt in the packaging bottle deteriorates can be judged according to whether the air pressure in the packaging bottle rises.

In the invention, in an initial state (namely, in the natural state), the valve is closed, gas below the valve cannot enter the upper part of the valve, and at the moment, the feedback unit in the cavity cannot change, and once the cover is opened, the puncture sheet at the bottom of the central body can cut the sealing film at the bottle opening, so that if yogurt in the front bottle is deteriorated, a large amount of gas generated by deterioration can cause the air pressure in the bottle to rise, and further, once the sealing film is cut, the valve can be pushed away by the air pressure, and meanwhile, the gas below the valve can enter the channel above the valve, and at the moment, the feedback unit in the cavity can change, the change of the feedback unit in the cavity can be observed from the outer side of the partition, and if the yogurt in the front bottle is not deteriorated, the air pressure in the bottle cannot rise, so that when the sealing film is cut, the valve cannot be opened, and the feedback unit in the cavity cannot change. Therefore, when a user prepares to eat the yoghourt, the user can judge whether the yoghourt is deteriorated or not according to whether the change of the feedback unit can be observed from the outer side of the spacer after opening the cover, so that the situation that the deteriorated yoghourt without the shelf life is eaten by mistake is avoided.

Further, the valve includes first gas pocket ring, second gas pocket ring, end cap and first spring, wherein, first gas pocket ring with second gas pocket ring all is provided with the through-hole that the gas passed, first gas pocket ring is fixed in the passageway in, second gas pocket ring is fixed in the passageway of first gas pocket ring top, the end cap is located between first gas pocket ring and the second gas pocket ring, the one end and the second gas pocket of first spring are encircled and are connected, and the other end is connected with the end cap, and when first spring was in natural state, the end cap was leaned on in the top of first gas pocket ring and is sealed the through-hole of first gas pocket ring under the effect of first spring.

Furthermore, the outer wall of the interlayer part is provided with a circle of convex ring, the inner wall of the annular surface of the shell is provided with a circle of concave ring, wherein the convex ring is embedded in the concave ring, the width of the concave ring is greater than that of the convex ring, and the depth of the concave ring is greater than that of the convex ring.

Furthermore, the outer surface of the convex edge of the central body is arc-shaped, and the maximum protruding height of the convex edge relative to the outer surface of the central body is between 0.2mm and 1.5 mm;

the first annular groove and the second annular groove of the interlayer part are both concave arc-shaped grooves, when the convex edge is positioned in the first annular groove, the convex edge is in clearance fit with the first annular groove, and when the convex edge is positioned in the second annular groove, the convex edge is in interference fit with the second annular groove.

Preferably, the rib is integrally formed around the central body.

Or, preferably, the convex edge is a silica gel ring which is clamped in a groove around the central body.

In conclusion, the invention has the following beneficial effects: by improving the cover of the packaging bottle, a method for judging whether the yoghourt in the bottle is deteriorated is added, and when the yoghourt is not stored according to the requirement and the situation that the yoghourt does not exceed the quality guarantee period but actually is deteriorated occurs, a user can observe the deterioration prompt of the yoghourt from the top of the cover when opening the cover, so that the problem that the deteriorated yoghourt is eaten by mistake under the situation can be solved.

Drawings

FIG. 1 is a schematic view of the structure of the packaging bottle of the present invention;

FIG. 2 is an enlarged view of the closure and finish of FIG. 1;

FIG. 3 is an enlarged view within dashed box A of FIG. 2;

FIG. 4 is an enlarged view within dashed box B of FIG. 2;

FIG. 5 is a schematic view of the base upper cover of FIG. 2 after the body portion has been moved downwardly;

FIG. 6 is an enlarged view within dashed box C of FIG. 5;

FIG. 7 is a schematic illustration of the lid of FIG. 5 with the body portion of the lid rotated to bring the sandwich portion into rotation;

FIG. 8 is an enlarged view within dashed box D of FIG. 7;

FIG. 9 is a schematic illustration of the integrated rib being replaced with a rib in the form of a silicone ring based on FIG. 3;

fig. 10 is a schematic diagram of the structure of the feedback unit in the present invention.

Detailed Description

The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.

The yogurt is classified into low-temperature yogurt and normal-temperature yogurt, wherein the low-temperature yogurt contains a large amount of live lactic acid bacteria, so that the low-temperature yogurt needs to be refrigerated for storage to control the activity of the lactic acid bacteria. If the merchant or the consumer improperly preserves the low-temperature yogurt, the low-temperature yogurt may be deteriorated without exceeding the shelf life, and the consumer usually cannot perceive the low-temperature yogurt before eating the low-temperature yogurt and only finds that the taste of the low-temperature yogurt is not reflected after eating the low-temperature yogurt.

The deteriorated yoghourt can generate a large amount of gas due to internal fermentation, so that the phenomenon of bag expansion can occur when the soft packaged yoghourt (such as paper packaging) is deteriorated, but the hard packaged yoghourt (such as thick-wall plastic bottle or glass bottle packaging) can not observe any abnormality from the outside. Therefore, the inventor improves the existing hard yoghourt packaging bottle, and when the yoghourt is deteriorated, the deterioration prompt can be reflected on the cover of the packaging bottle by using the gas generated by the deteriorated yoghourt so as to remind the eater of avoiding eating the deteriorated yoghourt without the shelf life by mistake.

Specifically, referring to fig. 1-4, the invention provides a food packaging bottle with an expiration prompting function, which is used for packaging low-temperature yogurt and comprises a bottle body 1 and a cover 2. The bottle opening 11 of the bottle body 1 is sealed by a sealing film 12, and external threads 111 are arranged on the periphery of the bottle opening 11. The lid 2 comprises a body portion 21 and a sandwich portion 22.

In the present invention, the bottle body 1 is made of plastic and the wall thickness of the bottle body 1 is thick, or the bottle body 1 may be made of glass, so that when the yogurt in the bottle body 1 is deteriorated and generates gas, the bottle body 1 is not expanded, and thus the "bag expansion" phenomenon mentioned above is not observed from the outside of the bottle body 1.

The body portion 21 includes a central body 211 and a housing 212. The central body 211 is located above the sealing film 12, the central body 211 is cylindrical, a puncturing plate 2111 for cutting the sealing film 12 is arranged at the bottom of the central body 211, a circle of convex ribs 2112 are arranged around the central body 211, a channel 2113 and a valve 2114 are arranged in the central body, the channel 2113 extends from the bottom of the central body 211 to the upper part of the central body 211, an opening of the channel 2113 is located on the bottom surface of the central body 211, the valve 2114 is arranged in the channel 2113, the valve 2114 is closed or opened to block or open the circulation of the channel 2113, and when the air pressure below the valve 2114 exceeds a preset value, the valve 2114 is pushed by the air pressure to be opened. The housing 212 includes a top surface 2121 and a ring surface 2122, wherein the top surface 2121 is located above the central body 211 and is integrally connected to the central body 211, a concave cavity 21211 is formed on an upper surface of the top surface 2121, the cavity 21211 is communicated with the passage 2113, a top of the cavity 21211 is sealed by a spacer 21212, a feedback unit is disposed in the cavity 21211 and changes when gas enters the cavity 21211 from the valve 2114, the ring surface 2122 surrounds the central body 211 and is spaced apart from the central body 211, and the ring surface 2122 is integrally connected to the top surface 2121. In addition, in a natural state, the valve 2114 is in a closed state, and the gas below the valve 2114 does not enter the passage 2113 above the valve 2114, and the feedback unit does not change at this time, and when the valve 2114 is opened and the gas below the valve 2114 enters the passage 2113 above the valve 2114, the feedback unit changes at this time, and the change of the feedback unit can be observed from the outside of the diaphragm 21212.

The interlayer part 22 is a hollow cylindrical structure, and is located between the central body 211 and the annular surface 2122 of the housing 212, and the interlayer part 22, the central body 211 and the annular surface 2122 of the housing 212 are both kept with a gap (i.e., the inner diameter of the interlayer part 22 is greater than the outer diameter of the central body 211, and the outer diameter is smaller than the inner diameter of the annular surface 2122 of the housing 212), the bottom of the interlayer part 22 is connected with the external thread 111 of the bottle mouth 11 through the internal thread 221, the inner wall of the interlayer part 22 is provided with a first annular groove 222 and a second annular groove 223 allowing the rib 2112 of the central body 211 to be clamped therein, wherein the first annular groove 222 is located above the second annular groove 223, and the rib 2112 of the central body 211 is clamped in the first annular groove 222, at this time, the central body 211 cannot be separated from the interlayer part 22, but can freely rotate in the interlayer part 22, and when the central body 211 moves down to the rib 2112 is clamped in the second annular groove 223, the central body 211 rotates together with the interlayer part 211.

The sealing film 12, besides closing the bottle opening 11, has the following functions: when the cap 2 is not opened and the bottle body 1 is tilted or inverted, yogurt is prevented from entering the passage 2113 and blocking the passage 2113.

Further, referring to fig. 4, the valve 2114 includes a first air hole ring 21141, a second air hole ring 21142, a plug 21143 and a first spring 21144, wherein the first air hole ring 21141 and the second air hole ring 21142 are provided with through holes for air to pass through, the first air hole ring 21141 is fixed in the channel 2113, the second air hole ring 21142 is fixed in the channel 2113 above the first air hole ring 21141, the plug 21143 is located between the first air hole ring 21141 and the second air hole ring 21142, one end of the first spring 21144 is connected with the second air hole ring 21142, the other end is connected with the plug 21143, and when the first spring 21144 is in a natural state, the plug 21143 abuts against the first air hole ring 3924 zxft And closes the through holes 21141 under the action of the first spring 21144.

Wherein the first spring 21144 further satisfies the following condition: when the yogurt in the bottle body 1 is deteriorated and a certain amount of gas is generated, the first spring 21144 cannot maintain the close state of the plug 21143, i.e. the plug 21143 is pushed away, and the first spring 21144 is compressed. The specific specification of the first spring 21144 can be determined by experiment according to actual conditions, and it is better to ensure that the yogurt is just deteriorated and the plug 21143 is opened when a small amount of gas is generated.

Further, in order to prevent the central body 211 from being separated from the sandwich portion 22 when the housing 212 is pulled up by force, the present invention is specifically designed as follows: referring to fig. 2, the outer wall of the interlayer part 22 is provided with a ring of convex rings 224, the inner wall of the annular surface 2122 of the housing 212 is provided with a ring of concave rings 21221, wherein the convex rings 224 are embedded in the concave rings 21221, the width of the concave rings 21221 is larger than the width of the convex rings 224 (i.e. the vertical dimension of the concave rings 21221 is larger than the vertical dimension of the convex rings 234 in fig. 2), and the depth of the concave rings 21221 is larger than the height of the convex rings 224 (i.e. the transverse dimension of the concave rings 21221 is larger than the transverse dimension of the convex rings 234 in fig. 2).

Further, referring to fig. 3, the outer surface of the rib 2112 of the central body 211 is curved, and the maximum protrusion height of the rib 2112 relative to the outer surface of the central body 211 is between 0.2mm and 1.5 mm. The first annular groove 222 and the second annular groove 223 of the interlayer part 22 are both concave arc-shaped grooves, and when the protruding edge 2112 is located in the first annular groove 222, the protruding edge 2112 is in clearance fit with the first annular groove 222, and when the protruding edge 2112 is located in the second annular groove 223, the protruding edge 2112 is in interference fit with the second annular groove 223.

For example, the outer diameter of the central body 211 is 28mm, the inner diameter of the sandwich portion 22 is 30mm, the maximum protrusion height of the rib 2112 relative to the central body 211 is 1.5mm, the maximum depth of the first annular groove 222 is 1mm, the maximum depth of the second annular groove 223 is 0.3mm, the radius of curvature of the first annular groove 222 is equal to the radius of curvature of the outer surface of the rib 2122, and the radius of curvature of the second annular groove 223 is greater than the radius of curvature of the outer surface of the rib 2122, so that when the rib 2122 is located in the first annular groove 222, there is a gap between the rib 2112 and the first annular groove 222 (see fig. 3), and when the rib 2112 is located in the second annular groove 223, the rib 2112 and the second annular groove 223 are pressed against each other and are in interference fit (see fig. 6).

In the present invention, the central body 211 is preferably made of plastic, and the protruding rib 2112 may be an annular protrusion (see fig. 3) which is made of the same material as the central body 211 and is integrally formed around the central body 211, or a silicone ring which is separable from the central body 211 and is inserted into a groove 2115 (see fig. 9) which is pre-arranged around the central body 211.

Preferably, the feedback unit is specifically designed in a manner that:

referring to fig. 10, the feedback unit includes a movable plate 21213 and a plurality of second springs 21214; the movable plate 21213 is transversely disposed in the cavity 21211, and the movable plate 21213 is movable up and down in the cavity 21211, a side wall of the movable plate 21213 is in sealing engagement with an inner wall of the cavity 21211 through a sealing ring, and an upper surface of the movable plate 21213 is printed with a mark for indicating that the yogurt is expired, for example, a red "expired" letter is printed on the movable plate 21213; the second springs 21214 are uniformly distributed below the movable plate 21213, one end of each second spring 21214 is connected to the movable plate 21213, and the other end is connected to the bottom surface of the cavity 21211; the septa 21212 are white ground glass sheets or ground plastic sheets, and the bottom surfaces of the septa 21212 are provided with adhesives; also, when the second spring 21214 is in a natural state, the movable plate 21213 is spaced apart from the spacer 21212 by a sufficient distance, and the mark printed on the upper surface of the movable plate 21213 in the cavity 21211 is not visible from the outside of the frosted spacer 21212, and when the valve 2114 is opened and the pressure of the gas entering the cavity 21211 exceeds a predetermined value, the movable plate 21213 is pushed by the gas pressure to a position where it is attached to the spacer 21212 and is adhered by the adhesive, and the mark printed on the upper surface of the movable plate 21213 is visible from the outside of the spacer 21212.

In the present invention, before the cap 2 is opened, the position relationship of the components is as shown in fig. 2, at this time, the piercing piece 2111 is located above the sealing film 12, the protruding edge 2112 of the central body 211 is clamped in the first annular groove 222 of the sandwich portion 22, and since the two are in clearance fit, when the housing 212 is rotated, the central body 211 rotates in the sandwich portion 22, and the sandwich portion 22 does not move, so that the cap 2 cannot be opened only by rotating the housing 212 at this time.

When the cover is opened, the specific process is as follows:

first, top surface 2121 of housing 212 is pressed down with force; in the process, the housing 212 and the central body 211 move downward, so that the protruding ribs 2112 of the central body 211 are separated from the first annular groove 222 of the sandwich portion 22, and then move downward and snap into the second annular groove 223, and meanwhile, the piercing piece 2111 also moves downward and punctures the sealing film 12, as shown in fig. 5 and 6;

thereafter, the housing 212 is rotated; at this time, the protruding ridge 2112 is clamped in the second annular groove 223, and the protruding ridge 2112 and the second annular groove 223 are in interference fit, so that the central body 211 drives the interlayer part 22 to rotate together when the housing 212 rotates, and the interlayer part 22 is connected with the bottle opening 11 through threads, so that the cap 2 can be gradually opened, and meanwhile, the piercing piece 2111 is driven by the central body 211 to form an arc-shaped opening on the sealing film 12, as shown in fig. 7; during this process, if the yoghurt in the bottle 1 has been previously deteriorated, the gas generated by the deterioration will pass through the opening of the sealing film 12 and enter the passage 2113 of the central body 211, then push the plug 21143 of the valve 2114 away, and then enter the upper cavity 21211 along the passage 2113, see fig. 8; thereafter, the movable plate 21213 is pushed by air pressure and moved upward until it is moved to a position where it is in contact with the spacer 21212 and is adhered by the adhesive, at which time the mark printed on the upper surface of the movable plate 21213 is visible from the outside of the spacer 21212. Therefore, when the cover 2 is opened, the user can judge whether the yogurt is going bad according to whether the mark (such as the 'expired' two-character) on the movable plate 21213 can be observed from the outside of the spacer 21212, so as to avoid eating the yogurt which is not over the shelf life but is going bad by mistake.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a food package bottle with expiration prompt facility for the packing of acidophilus milk, this packing bottle includes bottle (1) and lid (2), bottleneck (11) of bottle (1) are sealed by sealing membrane (12), be provided with external screw thread (111), its characterized in that around bottleneck (11): the lid (2) comprises a body portion (21) and a sandwich portion (22);

the main body portion (21) comprises a central body (211) and a housing (212); the central body (211) is positioned above the sealing film (12), the central body (211) is cylindrical, a puncturing sheet (2111) for cutting the sealing film (12) is arranged at the bottom of the central body (211), a circle of convex ribs (2112) are arranged on the periphery of the central body, a channel (2113) and a valve (2114) are arranged in the central body, the channel (2113) extends from the bottom of the central body (211) to the upper part of the central body (211), the valve (2114) is arranged in the channel (2113), the valve (2114) is closed or opened to block or open the circulation of the channel (2113), and when the air pressure below the valve (2114) exceeds a preset value, the valve (2114) can be pushed by the air pressure to be opened; the housing (212) comprises a top surface (2121) and an annular surface (2122), wherein the top surface (2121) is located above the central body (211) and is integrally connected to the central body (211), a recessed cavity (21211) is formed in an upper surface of the top surface (2121), the cavity (21211) is communicated with the passage (2113), a top of the cavity (21211) is sealed by a spacer (21212), a feedback unit is arranged in the cavity (21211), the feedback unit changes when gas enters the cavity (21211) from the valve (2114), the annular surface (2122) surrounds the central body (211) and keeps a distance from the central body (211), and the annular surface (2122) is integrally connected to the top surface (2121); in addition, in a natural state, the valve (2114) is in a closed state, gas below the valve (2114) cannot enter the channel (2113) above the valve (2114), the feedback unit cannot change at the moment, when the valve (2114) is opened and gas below the valve (2114) enters the channel (2113) above the valve (2114), the feedback unit changes at the moment, and the change of the feedback unit can be observed from the outer side of the diaphragm (21212);

the interlayer part (22) is of a hollow cylindrical structure, the interlayer part (22) is positioned between the central body (211) and the annular surface (2122) of the shell (212), gaps are reserved between the interlayer part (22) and the central body (211) as well as the annular surface (2122) of the shell (212), the bottom of the interlayer part (22) is connected with the external thread (111) of the bottle mouth (11) through an internal thread (221), the inner wall of the interlayer part (22) is provided with a first annular groove (222) and a second annular groove (223) which allow the rib (2112) of the central body (211) to be clamped into the groove, the first annular groove (222) is positioned above the second annular groove (223), and the rib (2112) of the central body (211) is clamped in the first annular groove (222), the central body (211) cannot be separated from the interlayer part (22) at the moment, but can freely rotate in the interlayer part (22), and when the central body (211) moves down to the rib (2112) is clamped in the second annular groove (223), the central body (211) rotates together.

2. The food packaging bottle with expiration prompting function as claimed in claim 1, characterized in that: the valve (2114) comprises a first air hole ring (21141), a second air hole ring (21142), a plug (21143) and a first spring (21144), wherein the first air hole ring (21141) and the second air hole ring (21142) are provided with through holes for gas to pass through, the first air hole ring (21141) is fixed in the channel (2113), the second air hole ring (21142) is fixed in the channel (2113) above the first air hole ring (21141), the plug (21143) is positioned between the first air hole ring (21141) and the second air hole ring (21142), one end of the first spring (21144) is connected with the second air hole ring (21142), the other end is connected with the plug (21143), and when the first spring (21144) is in a natural state, the first spring (21143) abuts against the first air hole ring (3524) to close the through holes (21134) below the first air hole ring (3524 zxft 3934).

3. The food packaging bottle with expiration prompting function as claimed in claim 1, characterized in that: the outer wall of the interlayer part (22) is provided with a circle of convex rings (224), the inner wall of the annular surface (2122) of the shell (212) is provided with a circle of concave rings (21221), wherein the convex rings (224) are embedded in the concave rings (21221), the width of the concave rings (21221) is larger than the width of the convex rings (224), and the depth of the concave rings (21221) is larger than the height of the convex rings (224).

4. The food packaging bottle with expiration prompting function as claimed in claim 1, characterized in that: the outer surface of the convex rib (2112) of the central body (211) is arc-shaped, and the maximum protruding height of the convex rib (2112) relative to the outer surface of the central body (211) is between 0.2mm and 1.5 mm;

the first annular groove (222) and the second annular groove (223) of the interlayer part (22) are both concave arc-shaped grooves, when the convex rib (2112) is located in the first annular groove (222), the convex rib (2112) is in clearance fit with the first annular groove (222), and when the convex rib (2112) is located in the second annular groove (223), the convex rib (2112) is in interference fit with the second annular groove (223).

5. The food packaging bottle with expiration prompting function as claimed in claim 4, wherein: the convex rib (2112) is integrally formed around the central body (211).

6. The food packaging bottle with expiration prompting function as claimed in claim 4, characterized in that: the convex rib (2112) is a silica gel ring and is clamped in the groove around the central body (211).