JP6292999B2 - Cap for container - Google Patents

Description

  The present invention includes a lid body having a cylindrical outer wall portion and a top wall portion, and a packing that is retained by the lid body, and the lid body is screwed into the mouth portion of the container. With regard to the container cap that seals the mouth portion with packing by being attached to the mouth portion, in particular, the powder caused by rubbing between the packing and the mouth portion of the container at the time of capping (closing lid) in the manufacturing process. It is intended to suppress the occurrence.

  As a conventional container cap for closing a synthetic resin container such as polyethylene terephthalate (PET) that contains various contents such as detergents, cosmetics, and foodstuffs, it is attached to the mouth of the container. For example, a synthetic resin packing made of polyethylene (PE) or the like is retained on the inner peripheral side of a cylindrical outer wall portion of a synthetic resin lid made of polypropylene (PP) or the like.

  In addition, as such a container cap, a disk-shaped top wall portion, and depending on the top wall portion, have a margin for fastening to the mouth portion (that is, the diameter of the inner peripheral surface of the mouth portion). There is known one using a packing comprising an inner ring portion (having an outer peripheral surface whose diameter is increased by a tightening allowance) (see, for example, Patent Document 1). In such a container cap, the outer peripheral surface of the inner ring portion of the packing is brought into airtight contact with the inner peripheral surface of the mouth portion of the container as the lid is attached to the mouth portion of the container. The mouth is sealed by bringing the peripheral bottom surface into airtight contact with the top of the mouth of the container.

Japanese Patent Laid-Open No. 9-188342

  However, in the container cap as described in Patent Document 1, the outer peripheral surface of the inner ring portion of the packing and the inner periphery of the mouth portion of the container when the lid is attached to the mouth portion of the container, particularly at the time of capping in the manufacturing process. Resin cutting powder is generated due to rubbing with the surface, and the powder may be mixed into the contents as foreign matter.

  For this reason, in the container cap as described in Patent Document 1, in order to improve the sliding between the packing and the mouth, at least one of them is a higher fatty acid amide, a higher fatty acid, a higher alcohol fatty acid ester. The generation of powder was suppressed by adding a slip agent such as or by suppressing the capping speed.

  The present invention has been developed in view of the above-described situation, and generates powder due to rubbing between the packing and the mouth of the container when the lid is attached to the mouth of the container, particularly during capping in the manufacturing process. It aims at providing the cap for containers which can be suppressed.

That is, the gist configuration of the present invention is as follows.
1. A cylindrical outer wall portion having a female screw portion screwed into a male screw portion formed on the outer peripheral surface of the mouth portion of the container, a lid body having a top wall portion closing the upper end of the cylindrical outer wall portion, A container that seals the mouth with the packing by attaching the lid to the mouth by screwing the cylindrical outer wall to the mouth of the container. For caps,
The packing includes an annular wall portion that can contact the top surface of the mouth portion, an annular foot portion that hangs down from an inner peripheral edge of the annular wall portion and is inserted into the mouth portion without tightening, and an annular foot portion of the annular foot portion. A top wall portion that closes the inner peripheral edge at the upper end, and an annular groove formed in the annular foot portion and opening toward the top wall portion of the lid,
The top wall portion of the lid body is brought into pressure contact with the outer peripheral side surface of the annular groove of the packing in accordance with the attachment of the lid body to the mouth portion, so that the annular leg portion is tightened with respect to the mouth portion. The ring-shaped middle leg to be generated is suspended ,
A middle leg that engages with a groove-side annular protrusion formed on the inner circumferential side surface of the annular groove so as to be prevented from coming off on the inner circumferential side surface of the annular middle foot part when the lid is opened. A container cap characterized in that a side annular projection is formed .

2. The outer circumferential side surface of the annular groove has a groove-side tapered portion that is inclined radially outward toward the top wall of the lid,
The outer peripheral side surface of the annular midfoot portion has a midfoot taper portion that is inclined radially outward toward the top wall portion of the lid,
The middle foot side taper portion causes a tightening margin to the mouth portion in the annular foot portion by contacting the concave groove side taper portion with the attachment of the lid to the mouth portion. Cap for container.

3 . On the inner peripheral surface of the cylindrical outer wall portion of the lid body, an outer wall-side annular projection that engages with the outer peripheral end of the annular wall portion of the packing so as to be prevented from being removed between the female screw portion and the top wall portion. Is formed,
An air vent opening for allowing air to pass between the upper surface of the packing and the bottom surface of the top wall of the lid is formed between the outer peripheral end of the annular wall and the outer wall-side annular protrusion. Said 1 or 2 container cap.

4 . On the bottom surface of the annular wall portion of the packing, an annular annular wall side sealing projection that is in airtight contact with the top surface of the mouth is formed,
The container cap according to any one of 1 to 3 , wherein an annular top wall side sealing protrusion is formed on the bottom surface of the top wall portion of the lid so as to be in airtight contact with the top surface of the annular wall portion of the packing. .

  According to the present invention, when the lid is attached to the mouth of the container, particularly at the time of capping in the manufacturing process, after the annular foot portion of the packing is inserted into the mouth of the container without tightening, A cylindrical outer wall portion is attached to the mouth portion, and with the attachment, the annular middle foot portion of the lid body is pressed against the outer peripheral side surface of the annular groove of the packing, and the annular foot portion of the packing is fastened to the mouth portion. Since the margin can be generated, it is possible to suppress the occurrence of rubbing between the outer peripheral surface of the annular foot portion of the packing and the inner peripheral surface of the mouth portion of the container accompanying the rotation of the lid.

  Therefore, according to the present invention, when a lid is attached to the mouth of a container, particularly for containers that can suppress the generation of powder due to rubbing between the packing and the mouth of the container during capping in the manufacturing process. A cap can be provided.

It is a half sectional view in a side view showing a state where a container cap according to an embodiment of the present invention is attached to a container. FIG. 3 is a half sectional view in a side view showing the container cap of FIG. 1. FIG. 2 is a half sectional view in a side view showing a state when the container cap of FIG. 1 is started to be attached to the mouth of the container. FIG. 2 is a half sectional view in a side view showing a state in which the container cap of FIG. 1 is being attached to the mouth of the container. FIG. 2 is a half sectional view in a side view showing a state when the container cap of FIG. 1 is completely attached to the mouth of the container.

Hereinafter, with reference to FIGS. 1-5, the container cap 1 which concerns on one Embodiment of this invention is illustrated and demonstrated in detail.
As shown in FIG. 1, the container cap 1 according to the present embodiment has a mouth C of a container C made of a synthetic resin such as polyethylene terephthalate (PET) that contains contents such as detergents, cosmetics, and foodstuffs. a lid 20 having a top wall 22 which closes the upper end of the cylindrical outer wall portion 21, and the cylindrical outer wall 21 having an internally threaded portion 21a screwed to the external thread portion C ₂ formed on _one outer circumferential surface, said And a packing 30 that is retained by the lid 20 so as not to come off.

Then, the container cap 1, by mounting the lid 20 to the mouth portion C ₁ by screwing the cylindrical outer wall portion 21 of the neck portion C ₁ of the container C, sealing the mouth portion C ₁ by packing 30 It is supposed to be. The lid 20 can be made of a synthetic resin such as polypropylene (PP), and the packing 30 can be made of a synthetic resin such as polyethylene (PE). The container cap 1 according to the present embodiment is particularly suitable for use in a one-cup type liquor wide-mouth container.

As shown in FIGS. 2 and 3, the packing 30 has an annular wall portion 31 that can contact the top surface C ₃ of the mouth, and hangs down from the inner peripheral edge of the annular wall portion 31, and has no allowance for the mouth portion C ₁ . An annular foot 32 inserted into the annular foot 32, a top wall 33 that closes the inner peripheral edge of the upper end of the annular foot 32, and an annular formed on the annular foot 32 and opening toward the top wall 22 of the lid 20. And a recessed groove 34.

As shown in FIGS. 3 to 5, the outer peripheral side surface 34 a of the annular groove 34 of the packing 30 is pressed against the top wall portion 22 of the lid body 20 as the lid body 20 is attached to the mouth portion C ₁ . In addition, an annular middle foot portion 23 that causes a tightening margin for the mouth portion C ₁ is suspended from the annular foot portion 32.

Further, the outer circumferential side surface 34 a of the annular groove 34 has a concave groove side tapered portion 34 b that is inclined radially outward toward the top wall portion 22 of the lid body 20, and the outer circumferential side surface 23 a of the annular middle foot portion 23. Has a midfoot taper portion 23 b that is inclined radially outward toward the top wall portion 22 of the lid 20. The leg-side taper portion 23b is, with the mounting of the lid 20 in the mouth portion C _1, by contacting the groove side taper portion 34b, results in interference against mouth C ₁ to the annular foot portion 32 It is supposed to let you.

  Further, on the inner circumferential side surface of the annular middle foot portion 23, a middle foot side annular projection 23c is formed that engages with a concave groove side annular projection 34c formed on the inner circumferential side surface of the annular concave groove 34 so as to be prevented from coming off. Has been.

  Further, the inner peripheral surface of the cylindrical outer wall portion 21 of the lid 20 is engaged with the outer peripheral end portion of the annular wall portion 31 of the packing 30 between the female screw portion 21a and the top wall portion 22 so as not to be detached. An outer wall side annular projection 21b is formed, and between the outer peripheral end of the annular wall portion 31 and the outer wall side annular projection 21b, between the upper surface of the packing 30 and the bottom surface of the top wall portion 22 of the lid body 20. An air vent opening h for allowing the air to pass therethrough is formed.

Further, an annular wall-side sealing projection 31 a that is in airtight contact with the mouth top surface C ₃ is formed on the bottom surface of the annular wall portion 31 of the packing 30, and the bottom surface of the top wall portion 22 of the lid 20. Is formed with an annular ceiling wall side sealing protrusion 22 a that is in airtight contact with the upper surface of the annular wall portion 31 of the packing 30.

According to the container cap 1 according to the present embodiment having such a configuration, when the lid 20 is attached to the mouth C ₁ of the container C, particularly when capping in the manufacturing process, as shown in FIG. First, after the annular foot portion 32 of the packing 30 is inserted into the mouth portion C ₁ of the container C without tightening, the attachment of the cylindrical outer wall portion 21 of the lid 20 to the mouth portion C ₁ proceeds. .

  In the progress of the mounting, from the state shown in FIG. 3, the outer peripheral side surface 23 a of the annular middle foot 23 of the lid 20 is changed to the outer peripheral side surface 34 a of the annular groove 34 of the packing 30 as shown in FIG. 4. The rotation of the packing 30 accompanying the rotation of the lid 20 can be avoided until the state comes into contact with.

Then, from the contact state between the outer peripheral side surface 23a of the annular middle foot 23 and the outer peripheral side surface 34a of the annular concave groove 34 of the packing 30 as shown in FIG. 4, the mounting completion state as shown in FIG. By the time, the outer peripheral side surface 23a of the annular middle foot portion 23 presses the outer peripheral side surface 34a of the annular concave groove 34 of the packing 30 to cause a tightening margin for the mouth portion C ₁ in the annular foot portion 32 of the packing 30. be able to. Therefore, suppressing the occurrence of rubbing between the outer peripheral surface and the mouth portion C ₁ inner peripheral surface of the container C of the annular foot portion 32 of the packing 30, as a result, while suppressing the generation of dust due to Re該擦, The outer peripheral surface of the annular foot 34 and the inner peripheral surface of the mouth C ₁ can be brought into airtight contact.

  Further, the outer peripheral side surface 23a of the annular middle foot 23 and the outer peripheral side surface 34a of the annular concave groove 34 of the packing 30 are in contact with each other via the concave groove side tapered portion 34b and the middle foot side tapered portion 23b. Since it is configured, a sufficient tightening allowance can be generated just before the mounting of the lid 20 is completed.

  An air vent opening h that allows air between the upper surface of the packing 30 and the bottom surface of the top wall portion 22 of the lid 20 to pass between the outer peripheral end portion of the annular wall portion 31 and the outer wall side annular projection 21b. Therefore, the air between the upper surface of the packing 30 and the bottom surface of the top wall portion 22 of the lid 20 can be released from the air vent opening h immediately after the lid 20 is completely attached. The lid can be closed.

Further, after the mounting completion of the lid 20, by an annular wall side sealing projection 31a, it is possible to seal between the bottom and the mouth portion top surface C ₃ of the annular wall portion 31 of the packing 30, a top wall side Since the sealing projection 22a can also seal between the bottom surface of the top wall portion 22 of the lid 20 and the top surface of the annular wall portion 31 of the packing 30, the sealing performance of the container cap 1 can be improved.

Furthermore, according to the container cap 1 according to the present embodiment, not only when the lid body 20 is mounted but also when the lid is opened, the container cap 1 operates in the reverse order as described above, and the annular foot portion 32 of the packing 30. of the occurrence of rubbing suppressed between the outer peripheral surface and the container C of the mouth C ₁ inner circumferential surface, as a result, it is possible to suppress the generation of dust due to Re該擦.

  In the state after opening, as shown in FIG. 2, the engagement between the groove-side annular protrusion 34 c and the midfoot-side annular protrusion 23 c and the outer peripheral end of the annular wall 31 of the packing 30 and the outer wall-side annular Due to the engagement of the protrusions 21b, the packing 30 can be efficiently retained inside the lid 20 to prevent it from coming off.

  The above description shows only one embodiment of the present invention, and it goes without saying that various modifications may be made within the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Cap for containers 20 Cover body 21 Cylindrical outer wall part 21a Female thread part 21b Outer wall side annular protrusion 22 Top wall part 22a Top wall side sealing protrusion 23 Annular middle foot part 23a Outer peripheral side surface 23b Middle foot side taper part 23c Middle foot side Annular protrusion 30 Packing 31 Annular wall part 31a Annular wall side sealing protrusion 32 Annular foot part 33 Top wall part 34 Annular groove 34a Outer circumferential side surface 34b Groove side taper part 34c Groove groove side annular protrusion C Container C ₁ port C ₂ Male thread C ₃ Top port h Air vent opening

Claims (4)

A cylindrical outer wall portion having a female screw portion screwed into a male screw portion formed on the outer peripheral surface of the mouth portion of the container, a lid body having a top wall portion closing the upper end of the cylindrical outer wall portion, A container that seals the mouth with the packing by attaching the lid to the mouth by screwing the cylindrical outer wall to the mouth of the container. For caps,
The packing includes an annular wall portion that can contact the top surface of the mouth portion, an annular foot portion that hangs down from an inner peripheral edge of the annular wall portion and is inserted into the mouth portion without tightening, and an annular foot portion of the annular foot portion. A top wall portion that closes the inner peripheral edge at the upper end, and an annular groove formed in the annular foot portion and opening toward the top wall portion of the lid,
The top wall portion of the lid body is brought into pressure contact with the outer peripheral side surface of the annular groove of the packing in accordance with the attachment of the lid body to the mouth portion, so that the annular leg portion is tightened with respect to the mouth portion. The ring-shaped middle leg to be generated is suspended ,
A middle leg that engages with a groove-side annular protrusion formed on the inner circumferential side surface of the annular groove so as to be prevented from coming off on the inner circumferential side surface of the annular middle foot part when the lid is opened. A container cap characterized in that a side annular projection is formed . The outer circumferential side surface of the annular groove has a groove-side tapered portion that is inclined radially outward toward the top wall of the lid,
The outer peripheral side surface of the annular midfoot portion has a midfoot taper portion that is inclined radially outward toward the top wall portion of the lid,
The middle foot taper portion, when the lid is attached to the mouth portion, comes into contact with the concave groove taper portion to cause a tightening margin for the mouth portion in the annular foot portion. The container cap according to 1. On the inner peripheral surface of the cylindrical outer wall portion of the lid body, an outer wall-side annular projection that engages with the outer peripheral end of the annular wall portion of the packing so as to be prevented from being removed between the female screw portion and the top wall portion. Is formed,
An air vent opening for allowing air to pass between the upper surface of the packing and the bottom surface of the top wall of the lid is formed between the outer peripheral end of the annular wall and the outer wall-side annular protrusion. The container cap according to claim 1 or 2 . On the bottom surface of the annular wall portion of the packing, an annular annular wall side sealing projection that is in airtight contact with the top surface of the mouth is formed,
The bottom surface of the top wall of the lid, said annular top wall side sealing projection in contact with the gas-tight on the upper surface of the annular wall portion of the packing is formed, in any one of claims 1 to 3 The cap for containers as described.

Images