JP2008280053A - Container lid, container with lid and content filling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container lid capable of preventing a quality deterioration due to the head-space volume of a container mounted with the lid. <P>SOLUTION: The container lid includes a cylindrical portion engageable with the peripheral of an opening portion of a container, and an inserting portion that is inserted into the opening portion of the container, whose tip end extending downward below the lower end of the cylindrical portion, and occupies more than a predetermined volume. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to prevention of airtight leakage of contents by a container lid placed on the mouth of a container such as a beverage bottle, and more particularly to a cap corresponding to maintaining the quality of contents such as high-concentration oxygen water or hydrogen water.

Conventionally, Patent Documents 1 to 5 disclose techniques relating to a container lid for preventing airtight leakage in the container. Each patent document discloses a container lid having a cap portion that is screwed into a screw groove formed on the outer periphery of a container mouth portion, and the inner side of the cap portion screwed into the screw groove in order to maintain the hermeticity of the contents. And a member for improving the airtightness of the container mouth. In other words, it can be said that these container lids are configured to prevent airtight leakage between the inside of the container and the outside of the container.
Japanese Patent Publication No.62-18421 JP-A-60-161062 Japanese Utility Model Publication 2-93250 Japanese Patent No. 2943048 JP-A-8-169455

  In recent years, products such as high-concentration oxygen water or high-concentration hydrogen water in which high-concentration oxygen or hydrogen is dissolved compared to ordinary mineral water have been developed. Since these products dissolve gases that are difficult to dissolve in water, such as oxygen and hydrogen, the volume occupied by gases other than the contents after filling high-concentration oxygen water as contents (hereinafter referred to as headspace) is the content. A new problem has been found that affects the maintenance of the quality of goods. That is, it has been found that it is difficult to maintain quality, no matter how much airtight leakage inside and outside the container is prevented.

  When normal contents other than high-concentration oxygen water are filled, the gas in the head space is replaced with nitrogen or carbon dioxide, thereby eliminating oxygen in the gas and preventing oxidation. It is possible to maintain the quality. In this case, it is considered sufficient to apply the techniques of the above patent documents. However, when the content is high-concentration oxygen water or the like, even if nitrogen or carbon dioxide is substituted, oxygen or hydrogen escapes to the head space, and the quality cannot be maintained. On the other hand, replacing the gas in the head space with a gas such as oxygen or hydrogen in order to maintain the quality is problematic from the viewpoint of safety. As another method, it is conceivable to fill the contents up to the mouth of the container to reduce the head space itself, but when the consumer opens the container lid, the contents are spilled due to the opening operation. As a result, there is a risk that the amount that can be consumed is reduced, and the hands and clothes of consumers are wetted.

  The present invention has been made in view of the above-described problems of the prior art, and it is an object of the present invention to provide a container lid, a container provided with a container lid, and a content filling method capable of preventing quality degradation due to headspace. And

  In the container lid of the present invention, a cylindrical portion that can be engaged with the outer periphery of the container mouth, and inserted into the container mouth, the tip extends below the lower end of the cylindrical portion, and the volume in the container mouth And an insertion portion occupying a predetermined amount or more.

  In the container lid according to the present invention, since the insertion portion occupies a predetermined amount or more of the volume in the container, the headspace is reduced when the container lid according to the present invention is attached to the container. Therefore, the oxidation of the contents can be suppressed and the deterioration of the quality can be prevented without going through the process of replacing the head space with an alternative gas. On the other hand, when the container lid according to the present invention is removed from the container, it is possible to secure a head space by the amount of the insertion portion, and when the consumer opens the container lid, the content is determined by the operation at the time of opening the container. It can prevent spilling, reducing the amount that can be drunk, and also wet the hands and clothes of consumers.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a partial cross-sectional view of the container lid 1 according to the first embodiment in a state where the container lid 1 is attached to the container mouth portion 2, and FIG. 2 is a partial cross-sectional view of the container lid 1 according to the first embodiment. In FIG. 1, the container 20 is shown as a cross-sectional view. Of the container lid 1, the cap portion 11 is shown as a cross-sectional view, and the inner plug 12 with an insertion portion is shown as a left half as a front view and a right half as a cross-sectional view. In FIG. 2, the cap portion 11 of the container lid 1 is a cross-sectional view, and the inner plug 12 with an insertion portion is shown with a left half as a front view and a right half as a cross-sectional view.

  The container 20 is a so-called PET bottle, and polyethylene, polypropylene, and polyethylene terephthalate are known as materials. However, the container 20 may be made of other synthetic resins, and is not particularly limited. Of course, it may be a metal container.

  A container mouth portion 2 is provided at the upper end of the container 20. The container mouth part 2 has a cylindrical shape with a smaller diameter than the body part of the container 2. On the outer periphery of the container mouth 2, in order from the bottom, a support ring 2a used in a content filling process and a transporting process into the container, a shoulder 2b that engages with a pilfer proof band 11c described later, and a cap part A screw groove 2c that engages with the screw 11 is formed. In addition, the inner periphery of the container mouth 2 was vertically raised in order from the top, with a sealing portion 2e that is in close contact with a part of the inner plug 12 with an insertion portion, which will be described later, to ensure airtightness in the container. An inner peripheral surface 2f is formed. Furthermore, the outer periphery and inner periphery of the container mouth part 2 are connected by the opening upper end 2d.

  The container lid 1 is composed of two parts, a cap portion 11 and an inner plug 12 with an insertion portion. First, the cap part 11 will be described. The cap part 11 is comprised from the cylindrical part 11a hold | gripped when a consumer opens, and the top-plate part 11b. A pilfer proof band 11c is attached to the lower end of the cylindrical portion 11a via a fragile portion. The pilfer proof band 11c engages with the above-mentioned shoulder 2b, and when the consumer opens the container lid 1, it can be visually confirmed whether or not it has been opened by breaking at the fragile portion.

  A screw portion 11d that is screwed into the screw groove 2c is formed on the inner periphery of the cylindrical portion 11a. An insertion portion holding convex portion 11e is formed in the inner periphery of the cylindrical portion 11a and in the vicinity of the lower surface of the top plate portion 11b. The cap portion 11 and the inner plug 12 with the insertion portion are integrated with each other by sandwiching the inner plug 12 with the insertion portion, which will be described later, between the lower surface of the top plate portion 11b and the convex portion 11e for holding the insertion portion.

  Next, the inner stopper 12 with the insertion portion will be described. The inner plug 12 with the insertion portion includes an engagement convex portion 12a that is press-fitted between the lower surface of the top plate portion 11b of the cap portion 11 and the insertion portion holding convex portion 11e, and a lower surface of the top plate portion 11b that extends in the radial direction. Is formed between the upper end opening 2d and the upper end opening 2d. Further, as shown in FIG. 2, the container mouth portion 2 has an inner peripheral upper portion that extends downward and has a slightly larger diameter than the inner diameter of the sealing portion 2e, and presses and seals with the sealing portion 2e. A first insertion portion 12c is formed. When the first insertion portion 12c is attached to the container mouth portion 2, the first insertion portion 12c comes into close contact with the sealing portion 2e by compressing and deforming. Further, a second insertion portion 12d is formed below the inner diameter of the container mouth portion 2 and below the first insertion portion 12c.

  12 d of 2nd insertion parts are made into the taper shape which becomes a small diameter as it goes below. The tip of the second insertion portion 12d has a spherical shape 12e. The lower end of the inner plug 12 with an insertion portion (spherical shape 12e) is formed so as to extend to a position below the lower end of the above-described pilfer proof band 11c. Furthermore, in Example 1, the lower end of the inner plug 12 with the insertion portion is formed so as to extend to a position below the support ring 2a.

  On the outer periphery of the second insertion portion 12d, a plurality of vertical grooves 12f communicating the upper periphery of the insertion portion and the lower periphery of the insertion portion are formed at equal intervals in the circumferential direction. A plurality of circumferential grooves 12g are formed in the axial direction on the outer periphery of the second insertion portion 12d and on the surface of the spherical shape 12e.

  The contents 3 filled in the container 20 are all filled in the gap between the side surface of the inner plug 12 with the insertion portion and the inner peripheral surface 2f. Hereinafter, the operation based on the relationship between the content unit 3 and each of the above-described configurations will be described.

(About high concentration oxygen water)
In Example 1, the content 3 is filled with high-concentration oxygen water. High-concentration oxygen water is water in which a larger amount of oxygen than that contained in water placed in normal air is dissolved. The water placed in the air is in an equilibrium state, and approximately 9.3 mg of oxygen is dissolved per liter at 20 ° C. In contrast, high-concentration oxygen water contains 5 to 30 times as much oxygen.

  At a temperature of 0 ° C., the solubility of oxygen in water is 0.049 mL under the conditions of 1 atm and 1 mL, so the oxygen concentration is 0.049 mL / 22400 mL / mol × 32 g / mol × 1000000 = 70 ppm. At a temperature of 20 ° C., the solubility of oxygen in water is 0.031 mL under the conditions of 1 atm and 1 mL, so the oxygen concentration is 0.031 mL / 22400 mL / mol × 32 g / mol × 1000000 = 44 ppm. As can be seen from the fact that the oxygen concentration in general mineral water is about 8 ppm, 44 to 70 ppm is the upper limit of the amount of oxygen in unsealed water. From the above, conventionally, high-concentration oxygen water refers to one having an oxygen concentration of about 50 ppm or more.

  In order to place high-concentration oxygen water in the distribution process, it is necessary to consider changes in the temperature environment and the like, so the container must be sealed at high pressure. The container 20 in Example 1 is sealed with high-concentration oxygen water having an oxygen concentration of 120 ppm at 100 kpa. Although it depends on the oxygen concentration, it is desirable to seal in the range of about 50 kpa to 150 kpa.

  Here, even if the high-concentration oxygen water is sealed at 100 kpa in the container, the gas other than the contents after filling the high-concentration oxygen water is dissolved because the gas that is very difficult to dissolve in water is dissolved as described above. A new problem has been found that the volume of the portion occupied by the head (hereinafter referred to as the head space) affects the quality maintenance of the contents. That is, it has been found that it is difficult to maintain the quality even if the airtight leakage between the inside of the container and the outside of the container is prevented.

  FIG. 3 is experimental data showing the relationship between the head space volume and the oxygen concentration reduction amount. When the internal pressure of the container is 100 kpa, the lower the oxygen concentration, the greater the headspace volume. That is, it can be said that there is a very strong correlation between the size of the head space volume and the quality maintenance.

  When normal contents other than high-concentration oxygen water are filled, the oxygen in the gas is eliminated by replacing the gas in the head space with nitrogen or carbon dioxide gas, thereby preventing oxidation. It is possible to maintain quality. In this case, it is considered sufficient to apply the techniques of the above-mentioned patent documents. However, when the content is high-concentration oxygen water or the like, even if the content is replaced with nitrogen or carbon dioxide, oxygen and hydrogen escape from the content into the headspace, and the quality cannot be maintained. On the other hand, replacing the gas in the head space with a gas such as oxygen or hydrogen in order to maintain the quality is problematic from the viewpoint of safety. As another method, it may be possible to reduce the headspace itself by filling the contents to the end of the container (hereinafter referred to as full filling), but when the consumer opens the container lid, There is a risk that the contents spill out due to the operation of this, the amount that can be drunk is reduced, and the hands and clothes of consumers are wetted.

  In addition, the container is fully filled with the container being compressed and deformed to some extent, and the container is closed in that state, so that when the container is opened, air is introduced into the container using the restoring force of the container, thus ensuring head space. Techniques for doing this are also known. However, when this technique is applied, it is not always useful because it requires restrictions due to the strength of the container, changes in the line in the manufacturing process, and the like.

  Therefore, in Example 1, the container lid 1 is provided with the inner plug 12 with the insertion portion. The inner plug 12 with the insertion portion occupies a predetermined amount or more of the volume in the container, and the occupied volume is set to about 5 to 10 mL. This volume corresponds to the head space secured in the container mouth 2 after opening.

  For example, when considering a container with a diameter of 20 mm for the container mouth 2, if the depth of about 16 mm is secured from the open end to the contents surface, the contents are prevented from spilling due to the opening operation of the consumer. can do. However, it is desirable to secure 20mm or more in consideration of the safety factor.

  Generally, the shape of the container mouth applied to a PET bottle or the like is standardized, and the depth of 20 mm is about the same as the height of the cylindrical portion 11a including the pilfer proof band 11c. As described in the contents filling method described later, the inner plug 12 with the insertion portion preferably has a tapered shape or a smaller diameter than the opening. Therefore, the length of the inner plug 12 with the insertion portion is 20 mm. The volume becomes insufficient. That is, in order to secure the depth of 20 mm after opening by the occupied volume of the inner plug 12 with the insertion portion, it cannot be achieved unless the lower end of the inner plug 12 with the insertion portion extends below the depth of 20 mm.

  Since this relationship is generally applicable to the container mouth portion according to other standards, the distal end of the inner plug 12 with the insertion portion is configured to be positioned below the cylindrical portion 11a. That is, the tip position of the inner plug 12 with the insertion portion is defined based on the axial length of the cylindrical portion 11c, the spillage of the contents after opening, and the shape required for the inner plug 12 with the insertion portion. As a result, it is possible to obtain a specific effect that the head space can be made as small as possible when the container lid 1 is mounted, and a sufficient head space can be secured when the container lid 1 is removed.

  Note that the required occupied volume may change depending on the viscosity of the contents, but even the low viscosity liquid such as water is considered sufficient for the above capacity. Further, the occupied volume may be smaller. Even when the viscosity is low, the occupied volume may be reduced when the aperture is small, and the occupied volume may be increased when the aperture is large. That is, a depth that does not spill according to the diameter is set, and an occupied volume corresponding to this depth may be ensured.

(About content filling method)
Next, the content filling method will be described. As described above, when the container 20 is filled with high-concentration oxygen water and the container lid 1 is attached, the container internal pressure is sealed within a range of about 50 kpa to 150 kpa (gauge pressure) (hereinafter, all described as gauge pressure). To do). As shown in FIG. 3, when the internal pressure of the container is 100 kpa, a 20 ppm decrease is observed when the headspace volume is 4 mL, and a 45 ppm decrease is observed when the headspace volume is 10 mL. Therefore, when 120 ppm of high-concentration oxygen water is filled, the head space volume should be as close as possible to 0 mL, and it is desirable to keep it at most 4 mL. In other words, it is desirable that the difference between the volume of the contents 3 of the container with the container lid 1 and the volume of the inner plug 12 with the insertion portion and the volume of the container 20 be 4 mL or less. The "volume of the contents 3 of the container with the container lid 1" means that the contents 3 are filled in the container 2 and sealed with the container lid 1, that is, the net contents in the unopened product. Means quantity.

  From the above, the filling step of filling the container 20 with the high-concentration oxygen water that is the content 3 is filled, and the sealing step of mounting the container lid 1 on the container mouth 2 in that state is performed. did. In addition, since the container lid 1 is installed, high-concentration oxygen water corresponding to the occupied volume of the inner plug 12 with the insertion portion is allowed to escape outside the container when the container lid 1 is attached. This is because if the container 20 does not escape to the outside, the container 20 is inflated and deformed by the occupied volume of the inner plug 12 with the insertion portion, and if the consumer opens it, the contents may spill due to the restoring force of the container. .

  Here, since the contents 3 need to be surely released to the outside of the container, the inner plug 12 with the insertion portion and the container mouth portion can be formed by forming a taper shape particularly in the second insertion portion 12d of the inner plug 12 with the insertion portion. A gap was secured between the inner peripheral surface 2f of the two and a longitudinal groove 12f was formed. When the inner plug 12 with the insertion portion is inserted into the inner periphery of the container mouth 2 in a state where the contents 3 are fully filled, high-concentration oxygen water corresponding to the inserted volume is inserted into the outer periphery of the inner plug 12 with the insertion portion. Flows out of the container through a gap between the inner peripheral surface 2f and the inner peripheral surface 2f. Further insertion, the gap becomes considerably narrow and it is difficult to overflow, so the vertical groove 12f is used to efficiently discharge the container outside. Finally, the inside of the container and the outside of the container are completely sealed by the first insertion portion 12c and the sealing portion 2e.

  In this way, by forming the inner plug 12 with the insertion portion into a tapered shape and further forming the longitudinal groove 12f, the container 20 is not expanded, and the container lid is maintained while maintaining the headspace volume as close as possible to 0 mL. 1 can be attached to the container mouth 2.

(About the action when opening)
Next, the action at the time of opening will be described. As described above, it is assumed that the product has a container internal pressure of 100 kpa with the head space volume maintained at approximately 0 mL. When the consumer opens the product, the consumer grasps the cylindrical portion 11a of the cap portion 11 of the container lid 1 and rotates it so as to release the screw engagement. At this time, since only the first insertion portion 12c is in close contact with the sealing portion 2e, it can be rotated without requiring a strong force.

  When the container lid 1 is entirely lifted by the rotation, the pilfer proof band 11c is broken and the sealing between the first insertion portion 12c and the sealing portion 2e is released. Since the internal pressure of the container is 100 kpa, oxygen dissolved in the high-concentration oxygen water begins to escape into the air when exposed to the atmosphere. At this time, the inside of the container and the outside of the container are communicated with each other at an early stage by the vertical groove 12f, and air such as oxygen is discharged through the vertical groove 12f, so that the internal pressure of the container can be gradually lowered, and the container lid The internal pressure of the container can be sufficiently reduced before the 1 screw engagement is released. Therefore, the container lid 1 does not come off at a stretch.

  Since the removed container lid 1 is immersed in the content 3 particularly in the inner plug 12 with the insertion portion, the content 3 attached to the inner plug 12 with the insertion portion may cause dripping. Therefore, a plurality of circumferential grooves 12g were formed. The circumferential groove 12g secures a contact angle with the content 3 (liquid) by the groove angle of the circumferential groove 12g when the content 3 adhering to the inner plug 12 with the insertion portion hangs down. It increases the surface tension. Thereby, it becomes possible to hold | maintain the more contents 3 compared with the case where there is no circumferential groove 12g, and can suppress dripping.

  The circumferential groove 12g is preferably formed below the center in the axial direction of the inner plug 12 with the insertion portion because the purpose is to hold the drooping contents 3. This is because the content 3 held by the inner plug 12 with the insertion portion itself becomes too large if it is formed in all.

  As described above, the effects listed below can be obtained in the first embodiment.

  (1) The cylindrical portion 11a that can be engaged with the outer periphery of the container mouth, and the inner end of the container mouth 2 are inserted, the tip extends below the lower end of the cylindrical portion 11a, and the volume in the container 20 is set to a predetermined amount. And an internal stopper 12 with an insertion portion that occupies the above. Therefore, since the inner plug 12 with the insertion section occupies a predetermined amount or more of the volume in the container, the head space can be reduced, and the contents of the contents can be obtained without replacing the air in the head space with an alternative gas. Oxidation can be suppressed to prevent quality degradation. On the other hand, when the container lid 1 is removed from the container 20, the head space volume can be secured by the occupied volume of the inner plug 12 with the insertion portion, and when the container lid is opened by the consumer, the container lid 1 is opened. It is possible to prevent the contents from spilling due to the operation at the time of plugging, so that the amount that can be consumed is reduced, and the hands and clothes of consumers are prevented from getting wet.

  (2) The inner stopper 12 with the insertion portion was extended to a position where it came into contact with the contents of the container when the container lid 1 was attached to the container and placed on a horizontal surface. Therefore, the head space volume in the container can be reliably reduced.

  (3) The first insertion portion 12c that is in close contact with the inner periphery of the container mouth portion 2 is formed in the inner plug 12 with the insertion portion. Therefore, the inside of the container and the outside of the container can be reliably sealed.

  (4) A second insertion portion 12d having a diameter lower than the first insertion portion 12c and smaller than the inner periphery of the container mouth portion 2 was formed in the inner plug 12 with the insertion portion. Therefore, the container lid 1 can be easily attached to the container mouth portion 2.

  (5) The 2nd insertion part 12d was made into the taper shape which becomes a small diameter as it goes below. Therefore, the container lid 1 can be easily attached to the container mouth portion 2.

  (6) The inner stopper 12 with the insertion portion has the contents of the container entering between the second insertion portion and the inner periphery of the container mouth when the container lid 1 is attached to the container 20 and placed on a horizontal surface. did. Therefore, the head space volume can be reduced as much as possible.

  (7) The inner plug 12 with the insertion portion is formed with a groove that allows communication between the upper periphery of the insertion portion and the lower periphery of the insertion portion. Specifically, the longitudinal groove 12f was formed along the outer periphery of the inner plug 12 with the insertion portion. Therefore, the expansion of the container 20 can be suppressed when the container lid 1 is mounted in the manufacturing process, and the gas in the container is gradually discharged out of the container at an early stage when the consumer opens the cap. By doing so, a rapid pressure change can be suppressed.

  (8) The vertical groove 12f makes it possible to connect the inside of the container and the outside of the container at the shortest distance compared to the spiral groove, etc., and the container lid 1 can be mounted and opened more smoothly. Can do.

  (9) Concavities and convexities were formed on the outer periphery of the inner plug 12 with the insertion portion. Specifically, the circumferential groove 12g was formed below the center in the vertical direction of the inner plug 12 with the insertion portion. Therefore, the dripping of the content adhering to the inner plug 12 with an insertion part can be suppressed.

  (10) The contents of the container to which the container lid 1 is attached were high-concentration oxygen water having an oxygen concentration of 50 ppm or more. Therefore, a high effect can be obtained with respect to quality deterioration due to the head space volume. The liquid is not limited to high-concentration oxygen water but may be a liquid in which a gas that is difficult to dissolve in water is dissolved at a high concentration. For example, high-concentration hydrogen water may be used as a target.

  (11) The difference between the volume of the contents of the container equipped with the container lid 1 and the volume of the insertion portion and the volume of the container was in the range of 0 to 4 mL. Therefore, the oxygen concentration fall of high concentration oxygen water can be suppressed and quality deterioration can be suppressed.

  (12) The container internal pressure of the container to which the container lid 1 is attached was set to 50 kpa to 150 kpa by gauge pressure. Therefore, it is possible to suppress a decrease in the oxygen concentration of the high-concentration oxygen water and to suppress deterioration in quality.

  (13) The inner plug 12 with the insertion portion and the cylindrical portion 11a are separated. Therefore, the moldability of the inner plug 12 with the insertion portion can be improved. Also, since different materials can be applied, the degree of freedom of design change according to the required conditions can be improved.

  (14) The tip of the inner plug 12 with the insertion portion has a spherical shape. Therefore, even if it is at the time of reattachment after a consumer's opening, it can equip easily.

  (15) The contents are filled by the full filling process of filling the contents up to the mouth opening 2 of the container 20 and the sealing process of attaching the container lid 1 to the opening 2. Therefore, the volume of the head space after mounting the container lid 1 can be minimized.

  Hereinafter, modifications will be described. Since the basic operational effects are the same as those of the first embodiment, only different points will be described.

(Modification 1)
FIG. 4 is a diagram illustrating a first modification of the first embodiment. In Example 1, the circumferential groove 12g was formed as a means for preventing liquid dripping. On the other hand, the first modification is different in that a plurality of concave spherical surfaces 12g1 are formed. The concave spherical surface 12g1 is randomly formed on the lower outer periphery of the second insertion portion 12d and the surface of the spherical shape 12e. Thereby, the dripping of the content adhering to the inner stopper 12 with an insertion part can be suppressed.

(Modification 2)
FIG. 5 is a diagram illustrating a second modification of the first embodiment. In Example 1, the tip of the inner plug 12 with the insertion portion was formed into a spherical shape 12e. On the other hand, the modification 2 is different in that the conical shape 12e1 is used. Thereby, even if it is at the time of re-mounting after a consumer's opening, it can mount easily.

(Modification 3)
FIG. 6 is a diagram illustrating a third modification of the first embodiment. In Example 1, the cylindrical part 11a and the inner plug 12 with an insertion part were comprised separately. On the other hand, the modification 3 differs in that the cylindrical portion 11a and the inner plug 12 with the insertion portion are integrally formed. In configuring integrally, the modified example 3 does not include a top plate portion, and a portion corresponding to the top plate portion is bulged toward the inside of the container to form the inner plug 12 with an insertion portion. Therefore, a recess 120 is formed on the upper surface side of the inner plug 12 with the insertion portion.

  The pilfer proof band 11c of the first embodiment corresponds to the pilfer proof band 12c1 in FIG. 6, and the cylindrical portion 11a of the cap portion 11 of the first embodiment corresponds to the cylindrical portion 12a1 in FIG. A screw portion 11d formed in one cap portion 11 corresponds to the screw portion 12d1 in FIG. Also, the holding portion 12b1 in FIG. 6 is held by the pressing force of the cylindrical portion 12a1, unlike the first embodiment in which the holding portion 12b1 is held between the cap portion 11 and the upper end opening 2d.

Thereby, it becomes possible to eliminate the process of assembling the cap part and the insertion part, and cost reduction can be achieved. In the third modification, the hole 120 by the insertion portion is opened in the portion corresponding to the top plate portion. However, the hole 120 may be covered with a lid or the like.
In addition, although the said Example and modification demonstrated the case where high concentration oxygen water was applied as a content, another content may be sufficient. Specifically, it is not limited to a beverage in which a gas having a particularly low solubility is dissolved, and other soft drinks may be used.
In this case, the sum of the volume of the contents of the container 2 to which the container lid 1 is attached (that is, the net amount of the contents in the unopened product) and the volume of the inner plug 12 with the insertion portion, and the volume of the container 2 The difference is preferably 0 mL. Thereby, the quality of the contents can be maintained by preventing oxidation without replacing the gas in the head space with nitrogen or carbon dioxide.

It is a fragmentary sectional view showing the state where the container lid of Example 1 was attached to the container. 3 is a partial cross-sectional view illustrating a container lid according to Embodiment 1. FIG. It is experimental data showing the relationship between the head space volume of Example 1 and an oxygen concentration fall amount. 6 is a partial cross-sectional view illustrating a first modification of the first embodiment. FIG. FIG. 6 is a partial cross-sectional view illustrating a second modification of the first embodiment. 6 is a cross-sectional view illustrating a third modification of the first embodiment. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container lid 2 Container mouth part 2a Support ring 2b Shoulder part 2c Screw groove 2d Upper end opening 2e Sealing part 2f Inner peripheral surface 3 Contents (high concentration oxygen water)
11 Cap part 11a Cylindrical part 11b Top plate part 11c Pilfer proof band 11d Screw part 11e Insertion holding convex part 12 Inner plug 12a with insertion part Engagement convex part 12b Holding part 12c First insertion part 12d Second insertion part 12e Spherical shape 12f Vertical groove 12g Circumferential groove 20 Container
120 recess
12a1 Cylindrical part
12b1 Nipping part
12c1 Pilfer proof band
12d1 Screw part
12e1 conical shape
12g1 spherical surface

Claims (23)

A cylindrical portion engageable with the outer periphery of the container mouth,
An insertion portion that is inserted into the container mouth, the tip extends below the lower end of the cylindrical portion, and occupies a predetermined amount or more of the volume in the container mouth;
A container lid characterized by comprising: The container lid according to claim 1,
The container lid, wherein the insertion portion extends to a position where it comes into contact with the contents of the container when the container lid is attached to the container and placed on a horizontal surface. The container lid according to claim 1 or 2,
The container lid, wherein the insertion portion has a first insertion portion that is in close contact with the inner periphery of the container mouth. The container lid according to claim 3,
The container lid characterized in that the insertion section has a second insertion section that is below the first insertion section and has a smaller diameter than the inner periphery of the container mouth. The container lid according to claim 4,
The said 2nd insertion part is a taper shape which becomes a small diameter as it goes below, The lid | cover for containers characterized by the above-mentioned. The container lid according to claim 4 or 5,
The container lid is characterized in that when the container lid is attached to the container and placed on a horizontal surface, the contents of the container enter between the second insertion section and the inner periphery of the container mouth. . The container lid according to any one of claims 1 to 6,
The container lid, wherein the insertion portion has a groove that communicates the outer periphery of the insertion portion and the lower periphery of the insertion portion. The container lid according to claim 7,
The container lid, wherein the groove is a longitudinal groove formed along the outer periphery of the insertion portion. The container lid according to any one of claims 1 to 8,
The container lid, wherein the insertion portion has irregularities on an outer periphery of the insertion portion. The container lid according to claim 9,
The container lid, wherein the unevenness is provided below a center in a vertical direction of the insertion portion. The container lid according to claim 9 or 10,
The container lid, wherein the irregularities are circumferential grooves formed on the outer periphery of the insertion portion. The container lid according to claim 9 or 10,
The container lid characterized by comprising a plurality of concave spherical surfaces formed on the outer periphery of the insertion portion. The container lid according to any one of claims 1 to 12,
A container lid, characterized in that the content of the container to which the container lid is attached is high-concentration oxygen water having an oxygen concentration of 50 ppm or more. The container lid according to claim 13,
The container lid, wherein the difference between the volume of the contents of the container equipped with the container lid and the volume of the insertion portion and the volume of the container is in the range of 0 to 4 mL. The container lid according to claim 14,
The container lid, wherein the container internal pressure of the container to which the container lid is attached is 50 kpa to 150 kpa in gauge pressure. The container lid according to any one of claims 1 to 15,
The container lid, wherein the insertion portion and the cylindrical portion are integrated. The container lid according to any one of claims 1 to 15,
The container lid, wherein the insertion portion and the cylindrical portion are separate bodies. The container lid according to any one of claims 1 to 17,
The container lid, wherein the insertion portion has a conical tip. The container lid according to any one of claims 1 to 17,
The container lid, wherein the insertion portion has a spherical tip. The container lid according to any one of claims 1 to 19,
The said cylindrical part has a screw part screwed in the screw groove formed in the container mouth part outer periphery, The lid | cover for containers characterized by the above-mentioned. The container lid according to any one of claims 1 to 20,
A container lid, wherein the difference between the volume of the contents of the container equipped with the container lid and the volume of the insertion portion and the volume of the container is 0 mL.   A container comprising the container lid according to any one of claims 1 to 21. A full filling process for filling the contents up to the mouth opening of the container;
An enclosing step of attaching the container lid according to any one of claims 1 to 21 to the opening;
A content filling method comprising:

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