CN110615173B

CN110615173B - Twist-off type unscrewing cap with safety structure

Info

Publication number: CN110615173B
Application number: CN201810631620.3A
Authority: CN
Inventors: 翟银星; 骆轶; 傅一飞
Original assignee: YIWU EASY OPEN END INDUSTRY CORP
Current assignee: YIWU EASY OPEN END INDUSTRY CORP
Priority date: 2018-06-19
Filing date: 2018-06-19
Publication date: 2022-10-14
Anticipated expiration: 2038-06-19
Also published as: CN110615173A

Abstract

The invention discloses a twist-off type unscrewing cap with a safety structure, which comprises a cap top and a cylindrical cap wall, wherein a pit is formed on the cap top, the bottom surface of the pit is arched upwards to form a safety button, two convex rings are arranged at the lower part of the cap wall, an annular groove is formed between the two convex rings, a plurality of U-shaped cutting seams are arranged at the groove bottom of the annular groove along the circumferential direction of the cap wall, the cap wall at the upper side of each U-shaped cutting seam is inclined inwards to form a stamping opening penetrating through the cap wall, the cap wall between the adjacent stamping openings forms a bridging, the cap wall below the stamping opening forms an anti-theft ring, and the anti-theft ring is connected with the cap wall above the stamping opening through the bridging. The invention effectively solves the problems that the unscrewing cap in the prior art lacks a product quality safety reminding function and an operator is easy to be injured in the process of opening the cap, greatly improves the safety of the unscrewing cap in the using process and has very high practical value.

Description

Twist-off type unscrewing cap with safety structure

Technical Field

The invention relates to the technical field of packaging containers, in particular to a twist-off type unscrewing cap with a safety structure.

Background

Twist-off closures of the prior art generally have the following construction: the anti-theft cover comprises a cover top, a cover top side edge and a synthetic resin sealing gasket adhered to the inner side of the cover top, wherein an anti-theft ring is arranged on the lower side of the side edge and connected with the side edge through a bridging. The sealing gasket is contacted with the container opening and has a certain compression amount by being sleeved into the container opening and applying certain pressure on the cover top, and the sealing gasket is pulled by the thread on the side edge of the cover and the opening of the packaging container, the anti-theft ring and the edge-curling seal of the opening of the packaging container, so that the unscrewing cover can be well sealed on the container and the sealing performance is ensured. When the anti-theft ring is opened, the container is held by one hand, the container cover is pinched by the other hand to rotate upwards in the thread loosening direction, the anti-theft ring is limited at the neck of the container opening after being rolled and sealed, the bridging connecting the lateral edge and the anti-theft ring is broken, and the cover is removed. Usually, a plurality of notches are formed at the lower end of the side edge of the unscrewing cover, a bridge is formed among the notches, the formed bridge is also longer, the bridge and the edge of the notch are basically exposed outside, a plurality of sharp fracture points can be formed after the bridge is twisted off, operators are easily injured when the cover is rotated, and potential safety hazards exist. In addition, the safety of food is always an important concern of the industry, and the twist-off type unscrewing cap can verify whether the product is opened by people or not by judging whether the bridging is damaged or not, so that the anti-theft effect is achieved. However, the sealed product may be stored for a long time or in various aspects, and under various factors such as long-time temperature difference, collision, material performance degradation and the like, the original sealed product has a gas leakage problem, and at this time, whether the food is safe or not can not be judged according to the characteristic that the bridge is broken, so that the food safety problem may be caused. The twist-off type unscrewing cap in the prior art does not have a food safety reminding function, and the direction of how to better help and remind consumers to pay attention to the safety of purchased products is always the direction of efforts in the industry.

And on the other hand, the cover is screwed off to cover the container, the cover is sleeved into the opening of the container, after a certain pressure is applied to the top of the cover, the thread forming cutter in the middle of the side edge of the cover and the sealing cutter at the lower anti-theft ring are rotated, the threads of the cover are formed according to the threads of the container opening, and the anti-theft ring of the cover is formed according to the neck structure of the anti-theft ring of the container opening. In order to ensure the sealing performance of the cover after the cover is closed, a certain pressure is often applied to the top of the cover during the sealing, so that the sealing gasket and the container opening have certain interference to ensure the sealing, but the excessive pressure of the cover can cause the problems of container collapse, container anti-theft ring neck deformation and the like. The unscrewing cover cannot restore to an original state after being opened and bridged to break so as to play a role in theft prevention, but in the practical process, the opening part of the container cannot be completely consistent in forming, the anti-theft ring cannot be particularly attached to a convex ring of the container when being curled, so that the unscrewing cover firstly rotates for a certain angle when being opened, the anti-theft ring and the unscrewing cover firstly move upwards for a small end distance, the anti-theft ring is clamped by the convex ring, and the bridging of the unscrewing cover is broken only by continuously rotating the unscrewing cover; particularly, in a metal container, the cross section of a convex ring of which the neck of a container opening is used for limiting the upward movement of the anti-theft ring can only be formed into an arc-shaped structure, so that the anti-theft ring cannot be tightly attached to the anti-theft ring when being curled, and generally can rotate for a certain angle when the rotary cover is opened, so that a potential safety hazard exists, namely, the rotary cover rotates (or loosens) to a certain extent when the rotary cover is touched in the process of carrying and storing products, namely, the compression amount of a sealing gasket is reduced before a bridge is not broken, and at the moment, the quality guarantee period of the products can be greatly shortened due to the poor sealing property.

Disclosure of Invention

The invention aims to solve the problems that the unscrewing cover in the prior art lacks a product safety reminding function and an operator is easy to hurt in the cover opening process, and provides the twist-off unscrewing cover with a safety structure, which can remind a consumer of safety and greatly improve the safety of the unscrewing cover in the using process.

Another object of the present invention is to provide a twist-off type unscrewing cap with a safety structure, which solves the problems of container collapse and neck deformation of the anti-theft ring of the container caused by excessive cap top pressure during the closing process of the unscrewing cap in the prior art, and can greatly reduce the problems of container collapse and neck deformation of the anti-theft ring of the container caused by the unscrewing cap during the closing process.

The third purpose of the invention is to solve the problem that the sealing performance of the unscrewing cap in the prior art is easy to deteriorate, so that the shelf life of a product is greatly shortened, and provide the twist-off unscrewing cap with a safety structure, which has the characteristics of simple structure, good sealing performance and convenience in opening.

The invention adopts a specific scheme that the twisting-off type unscrewing cap with a safety structure is used for sealing the opening part of a container, the unscrewing cap comprises a cap top and a cylindrical cap wall formed by downwards extending the outer edge of the cap top, a sealing gasket is arranged on the lower surface of the cap top, a pit is formed on the cap top, the bottom surface of the pit is upwards arched to form a safety button, two convex rings which are parallel to each other and surround the cap wall are arranged on the lower part of the cap wall, an annular groove is formed between the two convex rings, a plurality of U-shaped cutting seams are arranged on the groove bottom of the annular groove along the circumferential direction of the cap wall, the cap wall on the upper side of each U-shaped cutting seam inclines inwards to form a stamping opening penetrating through the cap wall, the cap wall between the adjacent stamping openings forms a bridging, the cap wall below the stamping opening forms an anti-theft ring, and the anti-theft ring is connected with the cap wall above the stamping opening through the bridging. The top of the unscrewing cover is provided with a pit, the bottom of the pit is provided with an upward arc-shaped arch structure, the arch structure can be sunken to form a downward concave surface under the action of external atmospheric pressure when negative pressure is generated inside the product after the product is vacuumized or the product is subjected to heat packaging and cooling, and the concave surface is always present in the shelf life of the product. When the sealing failure of the container causes the air to flow into the container or the food in the container is deteriorated to generate gas, so that when the internal and external air pressure is the same or the internal air pressure is greater than the external atmospheric pressure, the arch structure can bounce and restore to the original state to form the structural characteristic that the safety button arches upwards, at the moment, the consumer is reminded of paying attention, the commodity possibly has quality safety problems, and is not suitable for purchase or eating. On the other hand, two convex rings which are parallel to each other and surround the cover wall are arranged between the upper part of the unscrewing cover and the anti-theft ring, an annular groove is formed between the two convex rings, and the cutting seams for separating the anti-theft ring and the bridging bridges between the adjacent cutting seams are arranged at the groove bottom of the annular groove, so that the cutting seams and the bridging bridges are both positioned at the concave parts of the groove and are not easy to contact with the palm of an operator when the unscrewing cover is rotated, and the palm can be prevented from being injured by sharp pricks after the anti-theft ring is broken (namely the bridging bridges are broken). Meanwhile, the cover wall on the upper side of the U-shaped cutting seam is inclined inwards to form a punching opening (used for replacing a cut in the traditional process) penetrating through the cover wall, so that a spike formed during bridging fracture can be extruded by the cover wall on the upper side of the U-shaped cutting seam when the unscrewing cover rotates, and the sharpness of the spike is lost to a certain extent (or the direction of the spike is consistent with the rotating direction through extrusion), so that the possibility of damaging the palm of an operator is greatly reduced. Therefore, the problem that an operator is easily injured in the process of opening the cover of the unscrewing cover in the prior art is solved, and the safety of the unscrewing cover in the using process is greatly improved.

Preferably, the concave pit and the safety button are both circular, the diameter of the safety button is 10 mm to 35 mm, and the arching height of the safety button is 0.3 mm to 1 mm and is lower than the depth of the concave pit; the number of the U-shaped cutting seams is 6-12, and the U-shaped cutting seams are uniformly distributed on the peripheral surface of the unscrewing cover.

Preferably, the bridge is provided with a notch, the notch is arranged along the circumferential direction of the periphery of the cover wall, the number of the notches on the bridge is one, the cross section of each notch is triangular, the bottom edge of each triangular notch is flush with the lower side edge of the stamping opening, the maximum depth of each notch is 40% -60% of the thickness of the cover wall, and the width of the notch of each notch is 0.7-1.3 times of the depth of each notch. The notch is formed by removing a part of cover wall materials in a cutting mode, and is different from a notch pressing structure formed by extrusion and the like, on one hand, the existence of the notch enables the wall thickness of a bridge to be locally thinned and the structural strength to be reduced, on the other hand, the stress at the notch is concentrated when the unscrewing cover is opened, so that the opening force of the unscrewing cover can be greatly reduced, and the purpose of opening is facilitated. The bottom edge of the triangular notch groove is flush with the lower side edge of the stamping opening, so that the outer edge of the lower side edge of the stamping opening after the bridge is fractured by rotating the unscrewing cover is a complete circle, namely the round outer edge has no sharp pricks, and the palm can be furthest prevented from being injured by the sharp pricks after the bridge is fractured.

Preferably, an inner seal ring for abutting against an inner wall of the container mouth and an outer seal ring for abutting against an outer wall of the container mouth are integrally extended downward from an outer peripheral portion of the gasket, and a seal groove with a downward opening is formed between the inner seal ring and the outer seal ring. The inner side surface of the outer sealing ring (namely the outer side groove wall of the sealing groove) is tightly attached to the outer wall of the container opening to form outer sealing, the outer side surface of the inner sealing ring (namely the inner side groove wall of the sealing groove) is tightly attached to the inner wall of the container opening to form inner sealing, and the groove bottom of the sealing groove is tightly attached to the upper edge of the container opening to form upper sealing, so that the container is well sealed by screwing the cover.

Preferably, the top surface of the sealing gasket vertically corresponding to the sealing groove is provided with a material containing groove, the bottom surface of the material containing groove is arc-shaped, the central line of the cross section of the material containing groove is superposed with the central line of the cross section of the sealing groove, the opening width of the material containing groove is 55-75% of the width of the sealing groove, and the depth of the material containing groove is 35-65% of the opening width of the material containing groove; when the cover is screwed to seal the container opening, the inner side surface of the outer sealing ring is tightly attached to the outer wall of the container opening, the outer side surface of the inner sealing ring is tightly attached to the inner wall of the container opening, the groove bottom of the sealing groove is tightly attached to the upper edge of the opening of the container, the cross-sectional area of the container groove is reduced, and the groove bottom of the container groove is close to the lower surface of the cover top. According to the invention, the material containing groove is arranged on the top surface of the sealing gasket above the sealing groove, and is arranged on the surface, which is contacted with the cover top, of the sealing gasket, when the cover is unscrewed to cover the container opening, downward pressure is generated when the cover is covered by the cover top, and the sealing gasket interferes to generate a reaction force, and part of the reaction force can be deformed and absorbed by the material containing groove, so that the reaction force can not be completely acted on the container, the pressure bearing of the container is greatly reduced, and the problems of container collapse, container anti-theft ring neck deformation and the like caused in the cover closing process of the unscrewing cover are greatly reduced.

Preferably, the height of the cross section of the inner sealing ring is greater than that of the cross section of the outer sealing ring (namely, the downward extension length of the inner sealing ring is greater than that of the outer sealing ring), an interference ring is convexly arranged at the lower part of the outer side surface of the inner sealing ring, and the distance between the interference ring and the bottom of the sealing groove is greater than the axial moving distance of the cap top when the unscrewing cap opening bridge is broken. The interference ring is of an annular structure protruding on the outer side surface of the inner sealing ring, the interference ring can play a role in strengthening sealing when the outer side surface of the inner sealing ring is tightly attached to the inner wall of a container opening, and because the distance between the interference ring and the bottom of the sealing groove is larger than the axial moving distance of the cover top when the anti-theft ring opened by the unscrewing cover is broken, namely in the initial stage of rotating and opening the unscrewing cover, when the unscrewing cover moves a certain distance in the axial direction but the anti-theft ring is not broken, the interference ring is always tightly attached to the inner wall of the container opening, so that the sealing between the inner sealing ring and the inner wall of the container opening before the anti-theft ring is broken is ensured, and the situation that the unscrewing cover rotates (or loosens) to a certain degree when the unscrewing cover is touched in the process of carrying and storing products, namely the compression amount of the sealing gasket is reduced before the breakage of the bridging does not occur, so that the sealing performance is poor and the quality guarantee period of the products is greatly shortened can be avoided.

Preferably, an annular tapered wall with a small upper part and a large lower part is formed on the cover wall close to the cover top, the upper section of the tapered wall is tightly attached to the outer sealing ring to form an outer sealing ring extruding part, when the cover is screwed off to seal the container opening, the pressure of the outer sealing ring to the outer wall of the container opening is greater than the pressure of the inner sealing ring to the inner wall of the container opening, and the apex angle of the tapered wall is 26-49 degrees. The invention forms an annular tapered wall with a small top and a big bottom on the cover wall close to the cover top, namely the upper section of the unscrewing cover is of a structure with a small top and a big bottom, the cross section of the cover wall of the section is inclined, the outer sealing ring is extruded by the tapered wall to form an extruding part, the inner side surface of the outer sealing ring is tightly attached to the outer wall of the container opening after being extruded by the extruding part, and the pressure of the outer sealing ring to the outer wall of the container opening is greater than that of the inner sealing ring to the inner wall of the container opening, so that the sealing of the outer sealing ring to the container opening is ensured, the problem of poor sealing performance of the traditional process in the mode that the container opening is tightly pressed by the cover top and a single-side (inner side) sealing ring is solved, meanwhile, the unscrewing cover is easy to be separated from the container opening when the unscrewing cover is opened due to the large friction force generated by the cover top and the double-side (inner and outer side) sealing rings to cause the difficulty in the opening of the traditional process, and the unscrewing cover is convenient on the premise of ensuring the sealing. The top angle is an included angle between conical walls on two sides of the cover top, the top angle is too small, and the lateral extrusion force of the outer sealing ring to the container opening is too large, so that the opening force of the unscrewing cover is too large easily; if the vertex angle is too large, the pressure of the outer sealing ring on the container opening is too small, and although the opening is easy, the sealing performance is poor.

Preferably, the inner side surface of the inner sealing ring is in transitional connection with the lower surface of the sealing gasket (namely the bottom surface of the sealing gasket which is close to the inner sealing ring and does not extend downwards) through a compression-resistant cambered surface, and the radius of the compression-resistant cambered surface is 0.7 to 1.3 times of the height of the cross section of the inner sealing ring; the lower part of the annular conical wall is provided with a plurality of internal pressure release openings punched inwards along the circumferential direction of the cover wall, and the cover wall at the lower side edge of the internal pressure release openings is bent inwards to form an inwards inclined plane structure. The compression-resistant cambered surface is arranged between the inner side surface of the inner sealing ring and the lower surface of the sealing gasket, so that the compression resistance of the inner sealing ring can be obviously improved, and the sealing effect of the interference ring on the inner wall of the container opening is strengthened. The internal pressure release port is used for releasing gas or liquid in the container in time when the pressure in the container is overlarge, so that the serious result caused by direct flying of the unscrewing cover due to overlarge pressure in the container is avoided.

Preferably, a decompression groove extending along the sealing groove is arranged on one side, close to the inner sealing ring, of the groove bottom of the sealing groove, the opening width of the decompression groove is 11% -24% of the width of the groove bottom of the sealing groove, and the depth of the decompression groove is 16% -29% of the width of the groove bottom of the sealing groove; the central line of the cross section of the pressure reducing groove is parallel to the central line of the cross section of the sealing groove, the inner side groove wall of the pressure reducing groove and the inner side groove wall at the groove bottom of the sealing groove are on the same cylindrical surface (namely the inner side groove wall of the pressure reducing groove is formed by extending the inner side groove wall of the sealing groove close to the groove bottom), and the groove bottom surface of the pressure reducing groove is arc-shaped. The function of the pressure reducing groove is to properly reduce the resistance of the inner sealing ring entering the container opening, and avoid the serious damage to the sealing performance of the container caused by the excessive resistance when the container opening is unscrewed and sealed by the cover due to the existence of the interference ring and the pressure-resistant cambered surface and the wrinkle at the interference ring caused by the excessive squeezing of the sealing gasket at the upper edge of the opening part of the container. Although the resistance when the container mouth is capped by unscrewing the cap can be reduced by reducing the compression-resistant cambered surface, the influence on the sealing performance of the interference ring is large, the influence can be reduced to the minimum degree by arranging the pressure reduction groove, and meanwhile, the phenomenon that the interference ring is folded is avoided, so that the technical scheme is ideal; on the other hand, the size of the cross section of the pressure reducing groove has a great influence on the sealing performance, and the oversize pressure reducing groove not only influences the sealing of the top end of the container mouth, but also reduces the sealing performance of the interference ring, so that the pressure reducing groove needs to be controlled within a reasonable range.

Preferably, the lower end of the outer side surface of the inner sealing ring is provided with a guide arc-shaped edge, and the upper edge of the guide arc-shaped edge is connected with the lower edge of the interference ring. The guide arc edge plays a guide role when the unscrewing cover is matched with the container opening.

The invention has the beneficial effects that: 1. the problem that the unscrewing cap in the prior art lacks a product quality safety reminding function and the unscrewing cap in the prior art is easy to hurt an operator in the cap opening process is effectively solved, the product quality safety reminding can be carried out on a consumer, and the safety of the unscrewing cap in the using process is greatly improved. 2. The problems that in the prior art, the container is easily collapsed and the neck of the anti-theft ring of the container is deformed due to overlarge capping pressure during capping of the unscrewing cap are solved, and the problems that the container is collapsed and the neck of the anti-theft ring of the container is deformed during capping of the unscrewing cap are greatly reduced. 3. The problem of prior art's screw cap appear the leakproofness variation easily, lead to the product shelf life to shorten greatly is solved. The twist-off type unscrewing cap has the advantages of being good in anti-theft sealing performance and convenient to open, and has a product quality safety reminding function, and high practical value.

Drawings

FIG. 1 is a cross-sectional view of one construction of a twist-off closure having a safety feature in accordance with the present invention;

FIG. 2 is a partial cross-sectional view of the construction of a twist-off cap of the present invention;

FIG. 3 is a cross-sectional view of another partial construction of the twist-off cap of the present invention;

FIG. 4 is a partial cross-sectional view of the invention shown in a configuration for unscrewing the cap to close the mouth of the container;

FIG. 5 is a cross-sectional view of an alternative embodiment of the invention shown in partial cross-section during unscrewing of the closure for the container mouth;

FIG. 6 is a partial cross-sectional view of the structure at the location of the swing-out cover bridge of the present invention;

FIG. 7 is a schematic view of the invention in a stressed state during unscrewing of the closure over the mouth of the container;

fig. 8 is a structural sectional view of the unscrewing cap of the present invention in an operating state (negative pressure state).

In the figure: 1. the anti-theft cap comprises a cap top, a cap wall, a theft-proof ring, a sealing gasket, a container opening, an inner sealing ring, a sealing groove, a groove containing groove 9, an interference ring 10, a conical wall 11, an extrusion part 12, a compression-resistant arc surface 13, a decompression groove 14, a guide arc edge 15, an inner pressure release opening 16, a bridging 17, a convex ring 18, a circular groove 19, a U-shaped groove 20, a stamping opening 21, a notch groove 22, a pit 23 and a safety button 24.

Detailed Description

The following provides a further description of embodiments of the present invention by way of examples and with reference to the accompanying drawings.

Example 1

In embodiment 1 shown in fig. 1, a twist-off type unscrewing cap with a safety structure is used for sealing a container mouth, and the unscrewing cap comprises a cap top 1 and a cylindrical cap wall 2 formed by extending the outer edge of the cap top downwards, a sealing gasket 4 is arranged on the lower surface of the cap top, an inner sealing ring 6 used for abutting against the inner wall of a container mouth 5 (see fig. 4 and 5) and an outer sealing ring 7 used for abutting against the outer wall of the container mouth extend downwards integrally from the outer peripheral part of the sealing gasket, and a sealing groove 8 with a downward opening is formed between the inner sealing ring and the outer sealing ring. A pit 23 is formed on the top of the cover, the depth of the pit is 0.6 mm, the bottom surface of the pit is arched upwards to form a safety button 24, the pit and the safety button are both circular, the diameter of the safety button is 10 mm, and the arched height of the safety button is 0.3 mm; the lower part of the cover wall is provided with two convex rings 18 which are parallel to each other and surround the cover wall, an annular groove 19 is formed between the two convex rings, the groove bottom of the annular groove is provided with 8U-shaped cutting seams 20 along the circumferential direction of the cover wall, the U-shaped cutting seams are uniformly arranged on the outer circumferential surface of the unscrewing cover, the cover wall on the upper side of each U-shaped cutting seam inclines inwards to form a stamping opening 21 which penetrates through the cover wall, the cover wall between the adjacent stamping openings forms a bridging 17, the cover wall below the stamping opening forms an anti-theft ring 3, and the anti-theft ring is connected with the cover wall above the stamping opening through the bridging.

An annular tapered wall 11 with a small upper part and a large lower part is formed on the cover wall close to the cover top, the upper section of the tapered wall is tightly attached to the outer sealing ring to form an outer sealing ring extrusion part 12, when the container opening is unscrewed and covered, the pressure of the outer sealing ring on the outer wall of the container opening is greater than the pressure of the inner sealing ring on the inner wall of the container opening, and the vertex angle of the tapered wall is 38 degrees. The bridge of this embodiment is provided with a notch 22 (see fig. 6), the notch is arranged along the circumferential direction of the periphery of the cover wall, the notch on the bridge is one, the cross section of the notch is triangular, the bottom side of the triangular is flush with the lower side of the punching opening, the maximum depth of the notch is 51% of the thickness of the cover wall, and the width of the notch is 1 time of the depth of the notch. The upper part of the cover wall is provided with a plurality of internal pressure release openings 16 which are punched inwards along the circumferential direction of the cover wall, and the cover wall at the lower side of the internal pressure release openings is bent inwards to form an inwards inclined plane structure.

Example 2

In embodiment 2 shown in fig. 2, the top surface of the sealing gasket vertically corresponding to the sealing groove is provided with a material accommodating groove 9, the bottom surface of the material accommodating groove is arc-shaped, the central line of the cross section of the material accommodating groove coincides with the central line of the cross section of the sealing groove, the opening width of the material accommodating groove is 55% of the width of the sealing groove, and the depth of the material accommodating groove is 35% of the opening width of the material accommodating groove. In this embodiment, the height of the cross section of the inner sealing ring is greater than that of the cross section of the outer sealing ring, an interference ring 10 (the left part of the dotted line in the figure) is convexly arranged on the lower part of the outer side surface of the inner sealing ring, and the distance between the interference ring and the bottom of the sealing groove bottom is greater than the axial moving distance of the cap top when the opening bridge of the unscrewing cap is broken (namely, the leakage angle of the unscrewing cap is greater than the breaking angle of the anti-theft ring of the unscrewing cap). The lower extreme of the lateral surface of interior sealing ring is equipped with direction arc limit 15, the last edge on direction arc limit is connected with the lower limb of interference ring. When the cover is screwed to seal the container opening (see figure 5), the inner side surface of the outer sealing ring is tightly attached to the outer wall of the container opening, the outer side surface of the inner sealing ring is tightly attached to the inner wall of the container opening, the groove bottom of the sealing groove is tightly attached to the upper edge of the opening of the container, the cross-sectional area of the container groove is reduced, and the groove bottom of the container groove is close to the lower surface of the cover top. The depth of the concave pit in this embodiment is 1.5 mm, the diameter of the safety button is 35 mm, and the height of the arch of the safety button is 1 mm, and the rest is the same as that in embodiment 1.

Example 3

In the embodiment 3 shown in fig. 3, the inner side surface of the inner seal ring and the lower surface of the seal are transitionally connected by a compression-resistant arc surface 13, the radius of which is 1 time the height of the cross section of the inner seal ring. A decompression groove 14 extending along the sealing groove is arranged on one side, close to the inner sealing ring, of the groove bottom of the sealing groove, the opening width of the decompression groove is 17% of the width of the groove bottom of the sealing groove, and the depth of the decompression groove is 22% of the width of the groove bottom of the sealing groove; the center line of the cross section of the pressure reducing groove is parallel to the center line of the cross section of the sealing groove, the inner side groove wall of the pressure reducing groove and the inner side groove wall at the groove bottom of the sealing groove are on the same cylindrical surface, and the groove bottom of the pressure reducing groove is arc-shaped. The opening width of the material accommodating groove in this embodiment is 75% of the sealing groove width, and the depth of the material accommodating groove is 65% of the opening width of the material accommodating groove, and the rest is the same as that in embodiment 1 or embodiment 2.

The top of the unscrewing cover is provided with a pit, the bottom of the pit is provided with an upward arc-shaped arch structure, the arch structure can be sunken to form a downward concave surface (see figure 8) under the action of external atmospheric pressure when negative pressure is generated inside after products are vacuumized or heat-sealed and cooled, and the concave surface is always present in the shelf life of the products. When the sealing failure of the container causes the air to flow into the container or the food in the container is deteriorated to generate gas, so that when the internal and external air pressure is the same or the internal air pressure is greater than the external atmospheric pressure, the arch structure can bounce and restore to the original state to form the structural characteristic that the safety button arches upwards, at the moment, the consumer is reminded of paying attention, the commodity possibly has quality safety problems, and is not suitable for purchase or eating. In addition, two convex rings which are parallel to each other and surround the cover wall are arranged between the upper part of the unscrewing cover and the anti-theft ring, an annular groove is formed between the two convex rings, and the cutting seams for separating the anti-theft ring and the bridging bridges between the adjacent cutting seams are arranged at the groove bottom of the annular groove, so that the cutting seams and the bridging bridges are positioned at the concave parts of the groove when the unscrewing cover is rotated and are not easy to contact with the palm of an operator, and the palm can be prevented from being injured by sharp after the anti-theft ring is broken (namely the bridging bridges are broken). On the other hand, the cover wall on the upper side of the U-shaped cutting seam is inclined inwards to form a punching opening (used for replacing a notch in the traditional process) penetrating through the cover wall, so that a spike formed during bridging fracture can be extruded by the cover wall on the upper side of the U-shaped cutting seam when the unscrewing cover rotates, and the spike loses the sharpness to a certain extent (or the direction of the spike is consistent with the rotating direction through extrusion), so that the possibility of damaging the palm of an operator is greatly reduced. Therefore, the problem that an operator is easily injured in the process of opening the cover of the unscrewing cover in the prior art is solved, and the safety of the unscrewing cover in the using process is greatly improved. In addition, the container mouth matching part on the periphery of the sealing gasket of the unscrewing cover is provided with an inner sealing ring and an outer sealing ring, a sealing groove for being sleeved in the container mouth is formed between the two sealing rings, so that after the container mouth enters the sealing groove, the inner side surface of the outer sealing ring clings to the outer wall of the container mouth to form outer sealing, the outer side surface of the inner sealing ring clings to the inner wall of the container mouth to form inner sealing, and the groove bottom of the sealing groove clings to the upper edge of the container mouth to form upper sealing (see figure 5, the overlapping part in the figure is a compression part of the sealing gasket during actual matching), so that the unscrewing cover can well seal the container; the top surface of the sealing gasket above the sealing groove is provided with the material containing groove which is arranged on the surface of the sealing gasket, which is in contact with the cover body, when the container opening is unscrewed and the cover is closed, downward pressure F1 is generated when the cover is closed, and the reaction force F2 (shown in figure 7) generated by interference of the sealing gasket is generated, and part of the reaction force can be absorbed by the material containing groove due to deformation, so that the reaction force can not be completely acted on the container, the pressure bearing of the container is greatly reduced, and the problems of container collapse, container anti-theft ring neck deformation and the like caused in the process of closing the cover by unscrewing the cover are greatly reduced. Meanwhile, the interference ring is convexly arranged at the lower part of the outer side surface of the inner sealing ring, the interference ring is of an annular belt structure protruding on the outer side surface of the inner sealing ring, the interference ring can play a role of strengthening sealing when the outer side surface of the inner sealing ring is tightly attached to the inner wall of the container opening, because the distance between the interference ring and the bottom of the sealing groove is larger than the axial moving distance of the cover top when the anti-theft ring is opened by unscrewing the cover, namely, in the initial stage of the rotation opening of the unscrewing cover, when the unscrewing cover moves a certain distance in the axial direction but the anti-theft ring is not broken, the interference ring is always tightly attached to the inner wall of the container opening (see fig. 4, the state shown in fig. 4 is the leakage critical state of the container), the sealing between the inner sealing ring and the inner wall of the container opening before the anti-theft ring is broken is ensured, and therefore, the situation that the rotation (or loosening) of the unscrewing cover is caused to a certain extent when the unscrewing cover is touched in the process of carrying and storing products, namely, the compression amount of the sealing gasket is reduced before the bridging is not broken, and the quality guarantee period of the products is greatly shortened can be avoided.

In addition to the above embodiments, the technical features or technical data of the present invention may be reselected and combined to form new embodiments within the scope of the claims and the specification of the present invention, which are all realized by those skilled in the art without creative efforts, and thus, the embodiments of the present invention not described in detail should be regarded as specific embodiments of the present invention and are within the protection scope of the present invention.

Claims

1. The twist-off type unscrewing cap with the safety structure is used for sealing the opening of a container and is characterized in that the unscrewing cap comprises a cap top (1) and a cylindrical cap wall (2) formed by downward extending of the outer edge of the cap top, a sealing gasket (4) is arranged on the lower surface of the cap top, a pit (23) is formed in the cap top, the bottom surface of the pit is upwards arched to form a safety button (24), two mutually parallel convex rings (18) surrounding the cap wall are arranged on the lower portion of the cap wall, an annular groove (19) is formed between the two convex rings, a plurality of U-shaped cutting seams (20) are arranged at the groove bottom of the annular groove along the circumferential direction of the cap wall, the cap wall on the upper side of each U-shaped cutting seam is inwards inclined to form a stamping opening (21) penetrating through the cap wall, a bridging frame (17) is formed by the cap wall between the adjacent stamping openings, an anti-theft ring (3) is formed by the cap wall below the stamping opening, and the anti-theft ring is connected with the cap wall above the stamping opening through the bridging frame;

the bridge is provided with a notch (22) which is arranged along the circumferential direction of the periphery of the cover wall, the notch on the bridge is a single notch, the cross section of the notch is triangular, the bottom edge of the triangle is flush with the lower side edge of the punching opening, the maximum depth of the notch is 40-60% of the thickness of the cover wall, and the width of the notch is 0.7-1.3 times of the depth of the notch;

an inner sealing ring (6) which is used for being abutted against the inner wall of the container opening (5) and an outer sealing ring (7) which is abutted against the outer wall of the container opening extend downwards integrally from the outer peripheral part of the sealing gasket, and a sealing groove (8) with a downward opening is formed between the inner sealing ring and the outer sealing ring;

a material containing groove (9) is arranged on the top surface of the sealing gasket vertically corresponding to the sealing groove, the bottom surface of the material containing groove is arc-shaped, the central line of the cross section of the material containing groove is overlapped with the central line of the cross section of the sealing groove, the opening width of the material containing groove is 55-75% of the width of the sealing groove, and the depth of the material containing groove is 35-65% of the opening width of the material containing groove; when the cover is screwed to seal the container opening, the inner side surface of the outer sealing ring is tightly attached to the outer wall of the container opening, the outer side surface of the inner sealing ring is tightly attached to the inner wall of the container opening, the bottom of the sealing groove is tightly attached to the upper edge of the opening of the container, the cross-sectional area of the material containing groove is reduced, and the bottom of the material containing groove is tightly attached to the lower surface of the cover top;

the height of the cross section of the inner sealing ring is larger than that of the cross section of the outer sealing ring, an interference ring (10) is convexly arranged on the lower portion of the outer side face of the inner sealing ring, and the distance between the interference ring and the bottom of the sealing groove is larger than the axial moving distance of the cover top when the unscrewing cover opens the bridging and is broken.

2. The twist-off lid with safety structure as claimed in claim 1, wherein the recess and the safety button are both circular, the diameter of the safety button is 10 mm to 35 mm, and the height of the arch of the safety button is 0.3 mm to 1 mm and lower than the depth of the recess; the number of the U-shaped cutting seams is 6-12, and the U-shaped cutting seams are uniformly distributed on the peripheral surface of the unscrewing cover.

3. The twist-off type unscrewing cap with a safety structure as claimed in claim 1, wherein a cap wall close to the cap top is formed with an annular tapered wall (11) with a small upper part and a large lower part, the upper section of the tapered wall clings to the outer sealing ring to form an outer sealing ring squeezing part (12), when the cap is unscrewed to close the container mouth, the pressure of the outer sealing ring on the outer wall of the container mouth is greater than that of the inner sealing ring on the inner wall of the container mouth, and the apex angle of the tapered wall is 26-49 degrees; the number of the U-shaped cutting seams is 6-12, and the U-shaped cutting seams are uniformly arranged on the peripheral surface of the unscrewing cover.

4. The twist-off type unscrewing cap with a safety structure as claimed in claim 3, characterized in that the inner side face of the inner sealing ring and the lower surface of the sealing gasket are transitionally connected by a compression-resistant arc face (13), the radius of which is 0.7 to 1.3 times the height of the cross-section of the inner sealing ring; the lower part of the annular conical wall is provided with a plurality of internal pressure release ports (16) which are punched inwards along the circumferential direction of the cover wall, and the cover wall at the lower side edge of the internal pressure release ports is bent inwards to form an inwards inclined plane structure.

5. The twist-off type screw-on cap with safety structure according to claim 4, wherein a decompression groove (14) extending along the sealing groove is provided on the groove bottom of the sealing groove on the side close to the inner sealing ring, the opening width of the decompression groove is 11% to 24% of the width of the groove bottom of the sealing groove, and the depth of the decompression groove is 16% to 29% of the width of the groove bottom of the sealing groove; the center line of the cross section of the pressure reducing groove is parallel to the center line of the cross section of the sealing groove, the inner side groove wall of the pressure reducing groove and the inner side groove wall at the groove bottom of the sealing groove are on the same cylindrical surface, and the groove bottom of the pressure reducing groove is arc-shaped.

6. The twist-off unscrewing cap with safety feature as claimed in claim 1, characterized in that the lower end of the outer side of the inner sealing ring is provided with a guiding arc-shaped edge (15), the upper edge of which is connected to the lower edge of the interference ring.