JP6595579B2 - Plastic container lid structure - Google Patents

Description

  The present invention relates to a lid structure for a resin container, and more specifically, a cap having a mouth portion having a male screw portion on the outer peripheral surface and a female screw portion having a plurality of protrusions intermittently connected in the circumferential direction on the inner peripheral surface. And the male screw part has at least a part of the circumferential direction having one screw part in which the number of threads between the front end and the end of the mouth part is one, and the mouth part The present invention relates to a lid structure for a resin container in which the female screw portion of the cap is screwed into a male screw portion, and the mouth portion is wound and sealed with the cap.

  For example, when a carbonated beverage is filled in a resin container, if the carbonated beverage is stored in a place where the ambient temperature is high, the contents will thermally expand, and further the carbonic acid will escape from the liquid, which is accompanied by the resin. The internal pressure in the container increases. When the internal pressure increases, the top surface of the cap is pushed up, but since the male threaded portion provided in the mouth and the female threaded portion of the cap are in a threaded state, the male threaded portion is the lower female threaded portion. Is prevented from being pushed up, and this prevents the top of the cap from being pushed up. As a result, the inside of the resin container is kept in a sealed state, and the escape of carbonic acid is suppressed.

  On the other hand, the inventor, when the male screw portion has one screw portion where the number of threads between the front end and the end of the mouth portion is one in a part in the circumferential direction, It has been found that the force to prevent the female screw portion from being pushed up in the portion is weakened. In this case, when the internal pressure in the resin container increases, the sealed state in the resin container is hindered, and carbonic acid may escape. In order to solve this problem, it is conceivable to change the design of the mouth so that one screw portion does not occur, but this also involves a change in the design of the cap. In addition, there are also inconveniences such as increasing the height of the mouth by increasing the screw thread, becoming a special specification and making the mouth standard unusable.

  Therefore, an object of the present invention is to provide a lid structure for a resin container that suitably keeps the sealed state in the resin container simply by changing the configuration of the cap.

The lid structure of the resin container according to the present invention is
A mouth portion having a single threaded male thread portion on the outer peripheral surface;
A cap having a single threaded female thread portion on the inner peripheral surface, the plurality of protrusions being intermittently continuous in the circumferential direction;
The male screw portion has one screw portion in which at least a part of the circumferential direction has one screw thread between the distal end and the end of the mouth portion,
A resin container lid structure in which the female screw portion of the cap is screwed into the male screw portion of the mouth portion, and the mouth portion is wound and sealed by the cap,
Predetermined between a maximum winding state in which the cap is wound around the mouth portion to the maximum and a minimum winding state in which the cap is tightened by a minimum amount necessary for sealing the mouth portion. The projecting portion of the female screw portion placed on the lower side of the one screw portion of the male screw portion when the amount of tightening is less than the circumferential length of the other projecting portion. An extended projection having a long length is provided.

  Normally, a gap is formed in the female threaded part of the cap in order to reduce the weight and to remove the residue remaining in the female threaded part when the cap is attached, and to efficiently release the internal pressure. The plurality of protrusions are intermittently connected in the circumferential direction. And the inventor is engaged with one screw portion in the shape of the female screw portion of the cap in which a plurality of protrusions are intermittently connected, without changing the shape of the male screw portion of the mouth portion, for the above problem. It has been found that the protrusions (that are arranged on the lower side of one screw part) can be reinforced by increasing the length thereof to prevent the female screw part from being pushed up. In other words, the push-up of the female screw part is accompanied by the deformation of the protrusion part, but the deformation of the protrusion part can be suppressed by increasing the length of the protrusion part. Pushing up is suppressed.

  In the configuration described above, the protrusion disposed below the one screw portion is an extended protrusion having a circumferential length longer than the circumferential length of the other protrusion. Raising can be suppressed, and pushing up of the top surface of the cap can be suppressed. Therefore, the sealed state in the resin container can be suitably maintained only by changing the configuration of the cap.

  Hereinafter, the suitable aspect of the lid structure of the resin container of this invention is demonstrated. However, the scope of the present invention is not limited by the preferred embodiments described below.

In one aspect, the extension設突electromotive unit, the cap before Symbol outermost Shinji clamped over prior Symbol outermost Komaki clamped, is provided in the range that is disposed on the lower side of the one threaded portion It is preferable.

  In other words, in order to seal the mouth with the cap, it is not always necessary to wrap the cap to the mouth to the maximum extent (maximum tightening state). When tightened (minimum winding state), the mouth can be sealed. That is, the mouth portion can be in a hermetically sealed state as long as the tightening amount is between the maximum winding state and the minimum winding state. And according to the said structure, since the extending projection part is provided in the range by which the extending projection part is arrange | positioned under one screw part from the maximum winding state to the minimum winding state, the maximum winding state In any amount of tightening between the minimum tightening state, the extended protrusion is positioned below one screw portion, and the push-up of the female screw portion can be suppressed with higher accuracy.

  As one aspect, it is preferable that the projecting height of the extended projecting portion from the inner peripheral surface of the cap is higher than the projecting height of the other projecting portions.

  According to this configuration, since the area where the extended protrusion comes into contact with the one screw portion is increased, the female screw portion can be further prevented from being pushed up, and the top surface of the cap can be further restrained from being pushed up. .

As one aspect, it is preferable that the shape of the tip end edge of the extending protrusion in a cross section perpendicular to the top surface of the cap has at least two apexes .

  According to this configuration, by extending the tip end edge of the extended protrusion, the extended protrusion is strongly hooked by one screw portion. Thereby, the push-up of the female screw part can be further suppressed, and the push-up of the top surface of the cap can be further suppressed.

As one aspect, a rib connecting the outer seal portion that seals the outer peripheral surface of the mouth portion in the cap and the inner peripheral surface of the cap is provided with the extending protrusion at least when the predetermined amount of tightening It is suitable if it is provided in the part located above the part.

  That is, the push-up of the top surface of the cap is caused by the expansion and deformation of the top surface portion of the cap. According to this configuration, since the rib is provided between the outer seal portion and the inner peripheral surface of the cap, the rib can suppress the top surface portion of the cap from expanding and deforming at a portion corresponding to the one screw portion. be able to. Therefore, it is possible to further suppress the top surface of the cap from being pushed up.

Description perspective view of lid structure Cap cross section front view Description perspective view of the lid structure in the maximum winding state Description perspective view of the lid structure in the minimum winding state (A) Cross-sectional view showing a state in which the extended protrusion is positioned below one screw portion, (b) Cross-sectional view showing a state in which another protrusion is positioned below the one screw portion Cross section of cap

  An embodiment of a lid structure for a resin container according to the present invention will be described with reference to the drawings. The lid structure S of the resin container according to the present embodiment includes a mouth portion 10 having a male screw portion 12 on the outer peripheral surface 11 and a female screw portion 22 in which a plurality of protrusions 23 are intermittently connected in the circumferential direction. A male screw part 12 having at least a part in the circumferential direction and a single screw part 13a having one screw thread between the tip and the end of the mouth part 10. Have. Then, the female screw portion 22 of the cap 20 is screwed into the male screw portion 12 of the mouth portion 10, and the mouth portion 10 is wound and sealed with the cap 20. Further, the protruding portion 23 of the female screw portion 22 disposed below the one screw portion 13a of the male screw portion 12 is extended so that the circumferential length is longer than the circumferential length of the other protruding portion 23. Protrusions 24 and 25 are provided. Thereby, the force which prevents the female screw part 22 from being pushed up can be reinforced, and the top face 26 of the cap 20 can be prevented from being pushed up. Hereinafter, an example in which the lid structure S of the present embodiment is applied to a plastic bottle 1 (hereinafter referred to as a bottle 1) as a resin container will be described in detail.

  As shown in FIG. 1, the lid structure S includes a mouth portion 10 of the bottle 1 and a cap 20 attached to the mouth portion 10. The mouth portion 10 has a male screw portion 12 on the outer peripheral surface 11, and the cap 20 has a female screw portion 22 on the inner peripheral surface 21. In the lid structure S, the female screw portion 22 of the cap 20 is screwed into the male screw portion 12 of the mouth portion 10, and the mouth portion 10 is wound and sealed with the cap 20.

  The bottle 1 can be integrally molded by a stretch molding method such as biaxial stretch blow molding using a thermoplastic resin such as polyethylene, polypropylene, or polyethylene terephthalate as a main material. The capacity | capacitance of the bottle 1 is not specifically limited, It can be about 200 milliliters-2 liters generally distribute | circulating.

  Moreover, the liquid with which the bottle 1 is filled is not particularly limited. For example, beverages such as drinking water, tea, fruit juice, coffee, cocoa, soft drinks, alcoholic beverages, milk beverages, soups, and liquid seasonings such as sauces and soy sauces. Fees. In addition, when the lid structure S in this embodiment is stored in a place where the atmospheric temperature is high, the internal pressure in the bottle 1 is particularly increased due to the occurrence of carbonic acid loss from the liquid in addition to the thermal expansion of the contents. This is particularly preferable when the bottle 1 is filled with a carbonated beverage. However, even if it is not a carbonated beverage, the internal pressure in the bottle 1 increases due to the thermal expansion of the contents, and therefore the lid structure S in the present embodiment can also be suitably used for a non-carbonated beverage.

  The male screw portion 12 in the mouth portion 10 is formed by intermittently connecting a screw thread 13 protruding in a radial direction (a direction perpendicular to the outer peripheral surface 11) from the outer peripheral surface 11 in a spiral shape in the circumferential direction. And the male screw part 12 has the one screw part 13a in which the number of the screw threads 13 in the middle is one from the front-end | tip of the opening | mouth part 10 to the terminal at least in a part of the circumferential direction.

  As shown in FIGS. 1 and 2, the female screw portion 22 in the cap 20 includes a plurality of protrusions 23 that are intermittently connected in the circumferential direction. Then, the male screw portion 12 (screw thread 13) and the female screw portion 22 (projection) so that the screw thread 13 of the male screw portion 12 is accommodated in a gap formed between the two protrusion portions 23 arranged in the vertical direction. Part 23) is formed in a complementary manner.

  In the female screw part 22, two extending protrusions 24 and 25 having a circumferential length longer than the circumferential length of the other protruding part 23 are continuously provided. The extended protrusions 24 and 25 are positioned below the one screw portion 13a of the male screw portion 12 (the end side of the mouth portion 10) when the mouth portion 10 is wound and sealed with the cap 20. Are arranged as follows.

  In order to make the mouth 10 sealed with the cap 20, it is not always necessary to make the cap 20 tightly wound around the mouth 10 (maximum tightening state), and it is required as a minimum. If it is tightened to the tightening amount (minimum tightening state), the mouth portion 10 can be sealed. In other words, the mouth portion 10 can be in a sealed state as long as the amount of winding is between the maximum winding state and the minimum winding state. Further, in the lid structure S in the present embodiment, the difference in the amount of tightening between the maximum winding state and the minimum winding state is a central angle of 35 ° when the outer peripheral surface 11 of the mouth portion 10 is a circumference. Corresponds to the length of the arc.

  Therefore, the length of each of the extending protrusions 24 and 25 is a length corresponding to the length of an arc having a central angle of 35 ° when the outer peripheral surface 11 of the mouth 10 is a circumference. That is, the extended protrusions 24 and 25 are provided in a range of an arc having a central angle of 70 °. In the maximum winding state (see FIG. 3), the extended protrusion 24 is arranged below the one screw portion 13a. In the minimum winding state (see FIG. 4), the extended protrusion 25 is one. It arrange | positions under the screw part 13a. When the amount of tightening is between the maximum winding state and the minimum winding state (see FIG. 1), both extending protrusions 24 and 25 are disposed below one screw portion 13a. That is, the extended protrusions 24 and 25 are provided in a range in which the extended protrusion 24 and / or the extended protrusion 25 are arranged below the one screw portion 13a from the maximum winding state to the minimum winding state. It is in the state that was.

  5A shows a state in which the extended protrusion 24 is positioned below the one screw portion 13a, and FIG. 5B shows another protrusion 23 positioned below the one screw portion 13a. Indicates the state. As shown in FIGS. 5A and 5B, in the extended protrusion 24, the protrusion height from the inner peripheral surface 21 of the cap 20 is higher than the protrusion height of the other protrusions 23. Further, the extended protrusion 24 has a tip edge 24a that is angular. As for the extended protrusion 25, similarly to the extended protrusion 24, the protruding height from the inner peripheral surface 21 of the cap 20 is set higher than the protruding height of the other protruding portions 23, and the leading edge thereof. Is angry.

  As shown in FIGS. 5 and 6, the inner surface 26 a of the top surface 26 of the cap 20 is formed with an outer seal portion 27 that seals the outer peripheral surface 11 of the mouth portion 10. Then, a rib 28 connecting the outer seal portion 27 and the inner peripheral surface 21 of the cap 20 is provided in a portion corresponding to the one screw portion 13a when the mouth portion 10 is tightly sealed by the cap 20 and sealed. is there. More specifically, ribs 28 are provided above the extended protrusions 24 and 25, respectively.

  Next, the state when the mouth part 10 is wound and sealed with the cap 20 will be described. At this time, as shown in FIGS. 1, 3, and 4, the extended protrusion 24 and / or the extended protrusion 25 is disposed below the one screw portion 13 a. That is, when the internal pressure in the bottle 1 increases and the top surface 26 of the cap 20 is pushed up, the one screw portion 13a engages with the extended protrusion 24 and / or the extended protrusion 25. Become. For the one screw portion 13a, the force to prevent the female screw portion 12 to be engaged from being pushed up is usually weak. However, in the lid structure S in this embodiment, the extending protrusions 24 and 25 to be engaged are in the circumferential direction. The length is long and the deformation can be suppressed, and the one screw portion 13a suppresses the female screw portion 12 from being pushed up.

  Further, as shown in FIGS. 5A and 5B, in the extended protrusion 24, the protrusion height from the inner peripheral surface 21 of the cap 20 is higher than the protrusion height of the other protrusions 23. As a result, the area where the extended protrusion 24 abuts against the one screw portion 13a is increased. The extended protrusion 24 has a square end edge 24a, and the extended protrusion 24 is strongly hooked by the one screw portion 13a. As a result, the push-up of the female screw portion 13 is further suppressed. Note that the extended protrusion 25 has the same shape as the extended protrusion 24 and has the same effect.

  Moreover, since the rib 28 which connects between the outer seal part 27 and the internal peripheral surface 21 of the cap 20 is provided in the part corresponding to the one screw part 13a, it suppresses that the top | upper surface 26 of the cap 20 expands and deforms. As a result, the push-up of the top surface 26 of the cap 20 is further suppressed.

  As described above, in the lid structure S in the present embodiment, the force that prevents the female screw portion 23 from being pushed up in the one screw portion 13a is reinforced, and the top surface 26 of the cap 20 is prevented from expanding and deforming. The push-up of the top surface 26 of the cap 20 can be suppressed. Thus, in the lid structure S in the present embodiment, the hermetic state in the bottle 1 can be suitably maintained only by changing the configuration of the cap 20.

[Other Embodiments]
Finally, other embodiments of the lid structure of the resin container according to the present invention will be described. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises.

(1) In the above embodiment, the configuration in which the two extending protrusions 24 and 25 are continuously provided has been described as an example. However, the embodiment of the present invention is not limited to this. For example, a configuration in which one extended protrusion having a length obtained by combining the two extended protrusions 24 and 25 may be provided. Moreover, what is necessary is just to change suitably the length dimension of the extension protrusion parts 24 and 25 according to the length of the circumferential direction of the one screw part in resin-made containers.

(2) In the above embodiment, the extended protrusions 24 and 25 extend from the maximum winding state to the minimum winding state, and the extension protrusion 24 and / or the extension protrusion 25 is below the one screw portion 13a. The configuration provided in the range arranged in FIG. However, the embodiment of the present invention is not limited to this. For example, the extension protrusions 24 and 25 are provided with the single screw portion 13a only when the maximum winding state is only, the minimum winding state is only, or only when the amount of tightening is between the maximum winding state and the minimum winding state. It is good also as a structure arrange | positioned below.

(3) In the above embodiment, as shown in FIG. 5A, the protruding height from the inner peripheral surface 21 of the cap 20 in the extended protruding portion 24 is higher than the protruding height of the other protruding portions 23. The configuration in which the leading edge 24a is squared has been described as an example. However, the embodiment of the present invention is not limited to this. For example, the protruding height from the inner peripheral surface 21 may be the same as that of the other protrusions 23, and the tip edge 24a may be configured with a corner cut off. Similar changes can be made to the extended protrusions 25.

(4) In the above embodiment, the configuration in which the rib 28 that connects the outer seal portion 27 and the inner peripheral surface 21 of the cap 20 is provided in the portion corresponding to the one screw portion 13a has been described as an example. However, the embodiment of the present invention is not limited to this. For example, the configuration may be such that the rib 28 is not provided, or the configuration in which the rib 28 is provided in addition to the portion corresponding to the one screw portion 13a.

(5) Regarding other configurations, it should be understood that the embodiments disclosed herein are illustrative in all respects and that the scope of the present invention is not limited thereby. Those skilled in the art will readily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Accordingly, other embodiments modified without departing from the spirit of the present invention are naturally included in the scope of the present invention.

  The present invention can be used for, for example, a lid structure of a resin container in which a liquid is filled.

S Lid structure 1 Resin container 10 Mouth part 11 Outer peripheral surface 12 Male screw part 13a One screw part 20 Cap 21 Inner peripheral surface 22 Female screw part 23 Projection part 24, 25 Extension projection part 24a, 25a Tip edge 27 Outer seal part 28 Ribs

Claims (5)

A mouth portion having a single threaded male thread portion on the outer peripheral surface;
A cap having a single threaded female thread portion on the inner peripheral surface, the plurality of protrusions being intermittently continuous in the circumferential direction;
The male screw portion has at least a part of the circumferential direction of the mouth portion, and one screw portion in which the number of threads between the front end and the end of the mouth portion is one,
A resin container lid structure in which the female screw portion of the cap is screwed into the male screw portion of the mouth portion, and the mouth portion is wound and sealed by the cap,
Predetermined between a maximum winding state in which the cap is wound around the mouth portion to the maximum and a minimum winding state in which the cap is tightened by a minimum amount necessary for sealing the mouth portion. The projection portion of the female screw portion disposed on the lower side of the one screw portion of the male screw portion when the amount of tightening is approximately longer than the circumferential length of the other projection portion. A lid structure with a long extended projection. The extension設突electromotive unit, before Symbol from the most Shinji clamped, before Symbol over top Komaki clamped, the lid structure according to claim 1 provided in the range that is disposed on the lower side of the one threaded portion .   The lid structure according to claim 1 or 2, wherein a protruding height of the extended protruding portion from the inner peripheral surface of the cap is higher than a protruding height of the other protruding portion. The lid structure according to any one of claims 1 to 3 , wherein a shape of a front end edge of the extending projection portion in a cross section perpendicular to the top surface of the cap has at least two apexes . A rib that connects the outer seal portion that seals the outer peripheral surface of the mouth portion of the cap and the inner peripheral surface of the cap is positioned above the extending projection at least at the predetermined amount of tightening The lid structure according to any one of claims 1 to 4, wherein the lid structure is provided at a portion to be operated.

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