JP7570959B2 - Barrier Cap - Google Patents

Description

The present invention relates to a barrier cap with gas barrier properties, and in particular to a barrier cap that can stably form the area in which the gas barrier layer is layered.

Conventionally, food containers for storing contents such as dressings and seasonings have widely used caps that are attached to the mouth of the container body and have a partition with a removable portion defined by a thin, weakened portion in order to keep the inside of the container sealed until it is opened, and the cap can be removed by pulling up a pull ring provided on the removable portion to open the spout.
In addition, when pulling up the pull ring to break the thin, weakened portion, it can be difficult for users with weak finger strength to open the cap, so caps that are opened by rotating the top lid rather than by pulling up with a pull ring are also known.

Furthermore, in order to maintain the flavor of the contents, containers with excellent gas barrier properties that block oxygen and other substances contained in the air outside the container have been proposed, and barrier caps with gas barrier properties have been known to correspond to these caps (see, for example, Patent Document 1).

JP 2013-56688 A

In the cap described in Patent Document 1, in order to form an intermediate layer (gas barrier layer) made of a gas barrier resin in the base layer of the cap body so as to uniformly cover the container mouth, at least the inner top wall (partition) of the inner tube, including the intended opening portion (removal portion), is molded to be on the same plane. However, when the base resin forming the base layer of the cap body is injected into a mold using the center of the intended opening portion as a gate, the flow of the base resin in the radial direction is good, so the flow of the base resin into the injection tube becomes poor, and jetting is likely to occur on the outer circumferential surface of the inner tube.

If the gas barrier resin is then continuously injected from the gate at the same time as the base resin, the base resin does not easily flow into the injection tube because the flow in the radial direction is fast. As a result, if the gas barrier resin gets into the injection tube, the balance between the base resin and the gas barrier resin is lost, causing a problem of variation in the area where the gas barrier layer is formed.

The present invention aims to solve the above problems and provide an improved barrier cap in which a gas barrier layer is formed stably within a desired range as an intermediate layer within the base layer of the cap body.

In order to solve the above-mentioned problems, the present invention provides a barrier cap comprising a cap body which is attached to a container body and has a gas barrier layer layered as an intermediate layer in a base material layer, and an upper lid which opens and closes the cap body, wherein the cap body comprises an attachment portion which is attached to the mouth of the container body, a partition wall which extends inward from the attachment portion and seals the mouth, a pouring tube which stands from the partition wall, and a removal portion which is defined by a breakable thin-walled weakened portion in the partition wall within the pouring tube, and wherein the cap body adopts a configuration in which, at the point where the member branches from the removal portion towards the attachment portion, the thickness of the member which does not have the gas barrier layer layered on the inner surface is made thicker than the thickness of the member which does have the gas barrier layer layer on the inner surface, thereby balancing the flow of resin injected from the gate into the mold at the point where the member branches from the removal portion towards the attachment portion .

As an embodiment of the barrier cap, the member that does not have a gas barrier layer on the inside is a pouring tube, and the member on which the gas barrier layer is on the inside is a partition wall. Also, the mounting part includes an inner tube and an outer tube that are hung on either side of the mouth, and a base wall that is connected to the inner tube and the outer tube. The member on which the gas barrier layer is not on the inside is the inner tube, and the member on which the gas barrier layer is on the inside is the base wall.

Specific embodiments of the barrier cap include a configuration in which the barrier cap is a screw cap consisting of a cap body and a top lid that is screwed onto the cap body, and a configuration in which the barrier cap is a hinge cap consisting of a cap body and a top lid that is connected to the cap body via a hinge.

By adopting the above-mentioned configuration, the barrier cap of the present invention balances the flow of resin injected from the gate into the mold at the point where the member branches from the removal section toward the attachment section, exhibiting excellent moldability, and enabling the gas barrier layer to be stably formed within the desired range as an inner layer as an intermediate layer within the base layer of the cap body.

1 is a side cross-sectional view of a barrier cap according to a first embodiment of the present invention; 2 is an enlarged view of the main part of FIG. 1, in which (a) is an enlarged view of the vicinity of the pouring tube, and (b) is an enlarged view of the vicinity of the mounting part. 1A is a side cross-sectional view of a barrier cap according to a second embodiment of the present invention after molding and the cap is closed, and FIG. 1B is an enlarged view of the main part of FIG. 1A after the removal portion has been processed to prevent it from slipping out of the upper cap. 3(a) is an enlarged view of the main part of FIG. 3(a), where (a) is an enlarged view of the vicinity of the pouring tube, and (b) is an enlarged view of the vicinity of the mounting part.

Next, the barrier cap of the present invention will be described with reference to drawings showing examples in which it is embodied as a screw cap and a hinge cap.

In FIG. 1, A is a container body, B is a cap body attached to the container body A, and C is an upper lid screwed onto the cap body B, and the cap body B and the upper lid C constitute a screw cap.
The mouth 1 of the container body A is provided with a locking protrusion 2 which fits over the cap body B and holds it in place to prevent it from coming off.

As shown in FIG. 1, the cap body B is made up of an outer tube 5 on the outer periphery, an inner tube 6 on the inner periphery, and a base wall 7 located on the top surface side of the mouth part 1. It is also made up of an attachment part 4 forming an annular groove into which the mouth part 1 fits, a threaded wall part 8 standing upright and connected to the base wall 7, a partition wall 9 extending inward from the inner upper end of the threaded wall part 8, and a pouring tube 10 standing upright from the top surface of the partition wall 9.

The pouring tube 10 has a pouring outlet formed on its inner periphery for pouring out the contents contained in the container body A, and its upper portion is enlarged in diameter and curved outward.
A removal portion 14 that closes the pouring outlet is provided adjacent to the inner periphery of the pouring tube 10 via a thin-walled weakened portion 13 formed in the partition wall 9 .
As shown in FIG. 1 and FIG. 2(a), the partition 9 and the pouring tube 10 are formed to have thicknesses a and b, respectively, and are formed so that the thickness a (e.g., 1.1 mm) is greater than the thickness b (e.g., 0.8 mm).

The removal portion 14 consists of an annular bottom wall 15 having a thin-walled weakened portion 13 connected to its outer periphery, a cylindrical tubular wall 16 erected on the inner edge of the bottom wall 15, and a top wall 17 connected to the upper end of the inner periphery of the tubular wall 16.
An engagement projection 18 constituting one of the first teeth of the ratchet mechanism is provided at the upper part of the outer periphery of the cylindrical wall 16 so as to protrude radially, and a first engagement projection 19 is provided at the lower part so as to protrude in an annular shape.

The partition wall 9 is provided on its outer periphery with a sound-making projection 20 for notifying the completion of screwing the top cover C onto the cap body B.
The threaded wall portion 8 has a threaded portion (male thread) 21 provided on the outer circumferential surface.

The outer cylinder 5 of the attachment portion 4 is provided on its inner periphery with a locking reduced diameter portion 22 which engages with the locking ridge 2 of the container body A to prevent the mouth portion 1 from coming off.
As shown in Figures 1 and 2(b), the inner tube 6 and base wall 7 of the mounting portion 4 are formed to have thicknesses a' and b', respectively, with thickness a' (e.g., 1.4 mm) being greater than thickness b (e.g., 1.2 mm).

As shown in Figures 1 and 2, the cap body B of this embodiment is manufactured by co-injection molding so that the gas barrier layer D containing a barrier resin is the inner layer of the base material layer containing the base material resin of the cap body B, and an adhesive resin is blended into the base material resin of the base material layer, an adhesive resin is blended into the barrier resin of the gas barrier layer D, or an adhesive resin is blended into both the base material resin and the barrier resin.

In this embodiment, a gas barrier layer D is formed on the base wall 7 of the mounting portion 4 of the cap body B, the outer cylinder 5, the threaded wall portion 8, the partition wall 9, the pouring cylinder 10, the thin weakened portion 13, and the removed portion 14.
It should be noted that the gas barrier layer D is not formed inside the pouring tube 10 of the cap body B or the inner tube 6 of the attachment part 4 .

As the base resin for the base layer of the cap body B, known resins such as polyolefin resins such as polypropylene (PP) and polyethylene (PE), and polyethylene terephthalate resin (PET) are used.
As the gas barrier resin for the gas barrier layer D, known gas barrier resins such as ethylene vinyl alcohol copolymer (EVOH), polyvinyl alcohol (PVA), polyvinylidene chloride (PVDC), polyamide (PA), MX nylon (MXD6, etc.) and the like are used depending on the purpose of the gas barrier.
Among these, ethylene vinyl alcohol copolymer (EVOH) is preferred in terms of its barrier properties against oxygen and barrier properties against flavor and aroma.

Here, examples of blending the base resin that forms the base layer and the gas barrier resin that forms the gas barrier layer are shown below.
<Base layer><Barrierlayer>
LLDPE (Linear low density polyethylene) EVOH + LLDPE
LLDPE+EVOH EVOH
LLDPE + adhesive resin EVOH
LLDPE EVOH + adhesive resin LLDPE MXD6 + LLDPE
The blending ratio at which the bottle can be unplugged varies depending on the base resin of the base layer and the gas barrier resin of the gas barrier layer D. LDPE (low density polyethylene) may also be used as the base resin of the base layer.

As shown in FIG. 1, the top cover C has a top wall 25 and an outer peripheral wall 26 that is suspended from the outer periphery of the top wall 25. On the inner surface of the top wall 25, from the inside, there are suspended a cutting tube portion 27 whose inner periphery engages with the outer periphery of the removal portion 14 of the cap body B when the cap is closed and whose outer periphery abuts against the inner periphery of the dispensing tube 10, and a threaded tube portion 28 whose inner periphery screws into the outer periphery of the threaded wall 8. Furthermore, a sound-producing member 29 is disposed between the cutting tube portion 27 and the threaded tube portion 28.

On the inner circumference of the cutting tube portion 27, there are provided, at the upper part, engagement arms 30 that form second tooth portions that engage with the engagement protrusions 18 that form the first tooth portions of the removal portion 14 of the cap body B, in the same number as the engagement protrusions 18, and at the lower end, a second engagement protrusion 31 is formed that engages with the first engagement protrusion 19 of the cap body B.
Further, a seal portion is formed on the outer periphery of the cutting tube portion 27 so as to abut against the inner periphery of the pouring tube 10 and seal the pouring outlet.

The threaded cylindrical portion 28 is provided on its inner periphery with a threaded portion (female thread) 32 which screws into the threaded portion (male thread) 21 of the cap body B.
The sound-producing member 29 is provided with a vibrating piece at its tip, and when the top cover C is fastened to the cap body B, the vibrating piece comes into contact with the sound-producing projection 20 of the cap body B to produce a sound, thereby making it possible to know when the top cover C has been fastened to the cap body B.

Next, the manner of use and the effects of this embodiment will be described.
First, the cap body B of the barrier cap, which is the screw cap of this embodiment, can be manufactured by co-injection molding such that a gas barrier layer D made of a gas barrier resin is layered internally on a base material layer which is the base resin of the cap body B.

Specifically, the injection time for the co-injection molding of the cap body B in this embodiment is approximately 6 seconds, and approximately 1 second after the base resin is first injected alone, the gas barrier resin is injected simultaneously with the base resin for approximately 1 second, and then the base resin is injected alone for the remaining approximately 4 seconds to complete the molding.
The flow of resin at this time will be explained. As shown in FIG. 1, the base resin forming the base layer of the cap body B is first injected from a gate G provided in the center of the top wall 17 of the removal section 14 in the mold for the cap body B. The base resin passes from the removal section 14 through the thin-walled weakened section 13, and is first guided to the branching section between the pouring tube 10 and the partition wall 9, as shown in FIG. 1 and FIG. 2(a).
At this time, since the thickness a of the casting tube 10 at the branching portion is greater than the thickness b of the partition 9 which is the preceding member, the flow of the base resin flows more toward the tip of the casting tube 10 and less toward the partition 9 .
If the base resin continues to flow in this state, the resin will finish flowing into the entire pouring tube 10 and then the flow in the direction of the pouring tube 10 will stop, and the resin will only flow in the direction of the partition wall 9 .

Next, the resin flows from the partition wall 9 through the threaded wall 8, and is then guided to the branching portion between the inner tube 6 and the base wall 7 of the mounting portion 4, as shown in Figs. 1 and 2(b).
At this time, since the thickness a' of the inner tube 6 at the branched portion is greater than the thickness b' of the base wall 7, the flow of the base resin tends to flow toward the tip of the inner tube 6, and the flow toward the base wall 7 becomes poor.
If the base resin continues to flow in this manner, the resin will flow over the entire inner cylinder 6 and then stop flowing toward the inner cylinder 6 , and will flow only toward the base wall 7 and into the outer cylinder 5 .

Furthermore, about one second after the injection of the base resin has started, when the gas barrier resin is injected from the gate G simultaneously with the base resin for about one second, the injection tube 10 and the inner tube 6 of the mounting part 4 are filled with the base resin, so that the gas barrier resin does not flow into the injection tube 10 and the inner tube 6.
Therefore, the gas barrier layer D formed by the gas barrier resin traveling on the base resin is not formed on the pouring tube 10 and the inner tube 6 .
Since the gas barrier layer D is not formed on the pouring tube 10 of the cap body B and the inner tube 6 of the mounting portion 4, deformation due to the difference in shrinkage rate between the gas barrier layer D and the base resin after molding is prevented, and jetting is less likely to occur on the inner surface of the pouring tube 10 and the outer surface of the inner tube 6.

The barrier cap of this embodiment is a cap body B that requires gas barrier properties, and by forming a difference in thickness at the branch point, it is possible to control whether or not to insert a gas barrier layer D in the portion after the branch point, so it is possible to easily suppress partial deformation of the cap body B and create a barrier cap with stable sealing properties.

To attach the barrier cap of this embodiment to the container body A, the top lid C is screwed onto the cap body B and tightened, the cap body B and the top lid C are assembled, and then the attachment portion 4 of the cap body B is placed against the mouth 1 of the container body A and the container body A is plugged from the top.
In addition, when the threaded portion (female thread) 32 of the top cover C is screwed into the threaded portion (male thread) 21 of the cap body B and tightened, the ratchet mechanism causes the engagement arm 30 of the cutting tube portion 27 of the top cover C to overcome the engagement protrusion 18 on the cylindrical wall 16 of the removal portion 14 of the cap body B, allowing the top cover C to rotate.
In addition, in this embodiment, the vibrating piece at the tip of the sound-making member 29 of the top cover C touches the sound-making protrusion 20 of the cap body B and makes a sound, thereby making it possible to know that the top cover C has been completely tightened.
After plugging, the gas barrier layer D of the cap body B is formed so as to cover the opening of the mouth portion 1 of the container body A, so that the gas barrier properties within the container body A are improved.

Next, to use a container fitted with the barrier cap of this embodiment, the top lid C is rotated in the unscrewing direction. When the top lid C starts to rotate, it starts to rotate smoothly. Then, when the engagement arm 30 of the cutting tube portion 27 of the top lid C comes into contact with and engages with the engagement protrusion 18 of the cylindrical wall 16 of the cap body B, the ratchet mechanism comes into action and the rotational force of the top lid C is applied to the removal portion 14 of the cap body B via the ratchet mechanism.

At this time, the second engaging protrusion 31 of the cutting tube portion 27 tightly fits into the inner surface that has overcome the first engaging protrusion 19 of the tubular wall 16, thereby reinforcing the tubular wall 16 from the inside, making it easier for the rotational force of the upper cover C to be transmitted to the removal portion 14 via the ratchet mechanism, and generating a force that pulls the removal portion 14 upward as the screw rotates.
As the rotation of the top lid C continues, the rotational force and pulling force applied to the removal portion 14 eventually break the thin-walled weakened portion 13, opening the spout, and the removal portion 14, which has been separated from the partition 9, is pulled up by the cutting tube portion 27 which engages with the cylindrical wall 16 and rises together with the top lid C.

When the seal on the outer periphery of the cutting tube portion 27 separates from the inner periphery of the dispensing tube 10 and the threaded portion (female thread) 32 unscrews from the threaded portion (male thread) 21 to separate the top lid C from the cap body B, the contents of the container can be dispensed from the dispensing tube 10 from which the removal portion 14 has been removed together with the top lid C.

When the top lid C is reattached to the cap body B after using the container, the tip of the bottom wall 15 of the removal section 14 and the remains of the broken thin-walled weakened section 13 scrape off the contents adhering to the inner surface of the dispensing tube 10, thereby keeping the inner surface of the dispensing tube 10 clean.
Furthermore, the seal portion on the outer periphery of the cutting tube portion 27 abuts against the pouring tube 10 to seal the inside of the container.
In addition, the barrier cap in this embodiment is a screw cap in which the removal portion 14 moves to the top cover C when opened, but the removal portion 14 may be a screw cap that is opened by a pull ring.

Next, a second embodiment in which the cap body B and the top cover C of the first embodiment are modified will be described.
In the following, the same components as those in the first embodiment are given the same reference numerals, and only different components are given different reference numerals, and differences will be mainly described.

In FIG. 3, Ba is the cap body that is attached to the container body A, and Ca is the top lid that opens and closes by connecting the cap body Ba with a hinge E. The cap body Ba, top lid Ca, and hinge E together form a hinge cap.

As shown in FIG. 3(a), the cap body Ba is made up of an outer tube 41 on the outer periphery, an inner tube 42 on the inner periphery, and a base wall 43 located on the top surface side of the mouth 1. It is also made up of an attachment part 40 that forms an annular groove into which the mouth 1 fits, a partition wall 44 that rises from the attachment part 40 and extends inward, and a pouring tube 45 that stands up from the upper surface of the partition wall 44. A hinge E is connected to a predetermined position on the outer periphery of the upper end of the outer tube 41.

The pouring tube 45 has a pouring outlet formed on the inner periphery for pouring out the contents contained in the container body A, and the upper part is enlarged in diameter and curved outward.
The partition 44 on the inner periphery of the pouring tube 45 is provided with a removal portion 49 defined by a breakable thin-walled weakened portion 48 in order to open the pouring outlet during use.
As shown in Figures 3(a) and 4(a), the partition wall 44 and the dispensing tube 45 are formed to have thicknesses c and d, respectively, and are formed so that the thickness c (e.g., 1.3 mm) is greater than the thickness d (e.g., 1.0 mm).

As shown in FIG. 3( a ), the removal portion 49 has a bottom wall 50 connected to the partition wall 44 via a thin-walled weakened portion 48 , and a substantially cylindrical support wall 51 is provided on the upper surface of the bottom wall 50 on the opposite side to the hinge E.
A mountain-shaped locking projection 53 is provided on the upper surface of the base wall 51 via a step portion 52 so as to cover the base wall 51 .

The mounting portion 40 has a locking reduced diameter portion 55 on the inner circumference of the outer tube 41 that engages with the locking protrusion 2 of the container body A to prevent the mouth portion 1 from coming loose, and a ring-shaped lid engagement portion 56 is provided on the upper surface of the base wall 43 to keep the upper lid Ca closed.
As shown in Figures 3(a) and 4(b), the inner tube 42 and the base wall 43 of the mounting portion 40 are formed so that their thicknesses are c' and d', respectively, and that the thickness c' (e.g., 1.4 mm) is greater than the thickness d' (e.g., 1.0 mm).

As shown in Figure 3 (a), the upper lid Ca comprises a top wall 60 and an outer peripheral wall 61 with a hinge E connected to a predetermined position on the lower outer periphery suspended from the periphery of the top wall 60. A sealing tube 62 whose outer periphery is in close contact with the inner periphery of the pouring tube 45 of the cap body Ba when the lid is closed is suspended from the underside of the top wall 60, and an engagement wall 63 is suspended from the underside of the top wall 60 on the opposite side of the hinge E inside the sealing tube 62. Furthermore, an engagement hole 64 is opened in the top wall 60 which communicates with the inner surface of the engagement wall 63.
An arc-shaped knob 65 is provided on the lower end of the outer peripheral wall 61 opposite the outer hinge E, and a ring-shaped locking portion 66 is recessed at the lower part of the inner circumference into which the lid engagement portion 56 of the cap body Ba fits to maintain the lid in a closed state.

The inner peripheral surface of the engagement wall 63 is inclined to match the lower outer peripheral surface of the locking projection 53 of the removal portion 49 of the cap body Ba, and the lower surface is adapted to abut or come close to the step 52 on the upper surface of the base wall 51 when the lid is closed. In addition, an engagement portion 67 is provided on the upper surface of the inner peripheral side of the engagement wall 63.

In this embodiment, when the cap is first closed, the upper part of the locking protrusion 53 of the removal portion 49 of the cap body Ba reaches the engagement hole 64 as shown in FIG. 3(a), and the upper part of the locking protrusion 53 is expanded to fill the engagement hole 64 as shown in FIG. 3(b) by the subsequent anti-removal process using ultrasonic welding, and the locking protrusion 53 is engaged by the engagement portion 67 on the upper surface of the engagement wall 63.

Next, the manner of use and the effects of this embodiment will be described.
The barrier cap, which is a hinge cap of this embodiment, is manufactured by integral molding with the cap body Ba via the hinge E in a state where the top cover Ca is opened.
In this case, in addition to the base resin of the entire hinge cap, the gas barrier layer Da of the gas barrier resin can be formed as an inner layer only on the base layer of the cap body Ba by co-injection molding.

Specifically, the molding of the hinge cap in this embodiment is similar to that in Example 1 in that the base resin is first injected alone, and after a predetermined time has passed, the gas barrier resin is injected simultaneously with the base resin for a predetermined time, and then the base resin is injected alone to complete the molding.
To explain the flow of resin at this time, as shown in Figure 3(a), first, the base material resin that forms the base material layer of the cap is injected from a gate G provided in the center of the locking protrusion 53 of the removal portion 49 of the cap body Ba in the hinge cap mold. The base material resin passes from the removal portion 49 through the thin-walled weakened portion 48 and is first guided to the branching portion between the pouring tube 45 and the partition wall 44, which is the previous component, as shown in Figures 3(a) and 4(a).
At this time, since the thickness c of the injection tube 45 of the branched portion is greater than the thickness d of the partition 44, the base resin flows more toward the tip of the injection tube 45 and less toward the partition 44.
If the base resin continues to flow in this state, the resin will finish flowing into the entire pouring tube 45 , and the flow in the direction of the pouring tube 45 will stop, and the resin will only flow in the direction of the partition wall 44 .

Next, the resin flows from the partition wall 44 to the mounting portion 40, and is then guided to the branching portion between the inner cylinder 42 and the base wall 43 of the mounting portion 40, as shown in Figs. 3(a) and 4(b).
At this time, since the thickness c' of the inner tube 42 at the branched portion is greater than the thickness d' of the base wall 43 which is the preceding member, the flow of the base resin tends to flow toward the tip of the inner tube 42 and the flow toward the base wall 43 becomes poor.
If the base resin continues to flow in this manner, the resin will flow completely through the entire inner cylinder 42 , and then the flow toward the inner cylinder 42 will stop. Then, the resin will flow only toward the base wall 43 , and into the outer cylinder 41 .

Furthermore, when a gas barrier resin is injected from the gate G simultaneously with the base resin for a predetermined time after a predetermined time has elapsed since the injection of the base resin started, the injection tube 45 and the inner tube 42 of the mounting part 40 are filled with the base resin, so that the resin does not flow there.
Therefore, the gas barrier layer Da formed by the gas barrier resin traveling on the base resin is not formed on the pouring tube 45 and the inner tube 42 .
As in Example 1, the hinge cap of this Example can be manufactured by forming a difference in thickness at the branch point to be formed, thereby controlling whether or not a gas barrier layer Da is inserted in the portion beyond the branch point.

To attach the hinge cap of this embodiment to the container body A, the top lid Ca is rotated around the hinge E as a fulcrum to close the integrally molded cap body Ba, and then the tip of the locking protrusion 53 of the removal portion 49 of the cap body Ba protruding from the top wall 60 of the top lid Ca, as shown in Figure 3(a), is ultrasonically welded to prevent it from falling out.Then, the deformed locking protrusion 53, as shown in Figure 3(b), engages with the inner periphery of the engagement hole portion 64 of the top lid Ca and the upper surface of the engagement wall 63, and the removal portion 49 of the cap body Ba is attached to the inside of the top wall 60 of the top lid Ca.
The closed hinge cap is attached to the mouth portion 1 of the container body A filled with the liquid content.

When using the hinge cap of this embodiment for the first time, first, hook your fingers on the knob 65 of the top lid Ca and lift the knob 65. The top lid Ca opens using the hinge E as a fulcrum, and the removal portion 49 attached to the top lid Ca is pulled, so that the removal portion 49 itself is lifted from the opposite side of the hinge E and the thin-walled weakened portion 48 connected to the partition wall 44 is broken from the opposite side of the hinge E. By further lifting the top lid Ca, the breakage of the thin-walled weakened portion 48 progresses in the direction of the hinge E, and finally, after the removal portion 49 is removed from the partition wall 44, it is transferred to the top lid Ca.
In the partition wall 44 on the inner circumferential side of the pouring tube 45 of the cap body Ba, the trace of the removed portion 49 serves as a pouring outlet, which enables the content liquid in the container body A to be poured out.
Although the barrier cap in this embodiment is a hinge cap in which the removal portion 49 moves to the top cover Ca when opened, the barrier cap may be a hinge cap in which the removal portion 49 is opened by a pull ring.

The barrier cap of the present invention balances the flow of resin injected from the gate into the mold at the point where the member branches from the removal section to the attachment section, demonstrating excellent moldability, and can stably form a gas barrier layer as an inner intermediate layer within the base material layer of the cap body to a desired extent, making it suitable for use as a container for foods, beverages, seasonings, cosmetics, and other items that require gas barrier properties.

A Container body B, Ba Cap body C, Ca Top lid D, Da Gas barrier layer E Hinge G Gate a, a', b, b', c, c', d, d' Wall thickness 1 Mouth portion 2 Locking protrusion 4, 40 Mounting portion 5, 41 Outer tube 6, 42 Inner tube 7, 43 Base wall 8 Threaded wall portion 9, 44 Partition wall 10, 45 Spout tube 13, 48 Thinned weakened portion 14, 49 Removable portion 15, 50 Bottom wall 16 Cylindrical wall 17 Top wall 18 Engagement protrusion 19 First engagement protrusion 20 Sound-emitting protrusion 21 Threaded portion (male thread)
22, 55: Retaining reduced diameter portion 25, 60: Top wall 26, 61: Outer circumferential wall 27: Cutting tube portion 28: Threaded tube portion 29: Sound-producing member 30: Engagement arm 31: Second engagement protrusion 32: Threaded portion (female thread)
51: pull base wall 52: step portion 53: locking projection 56: lid locking portion 62: sealing tube 63: locking wall 64: locking hole 65: knob 66: locking portion 67: locking portion

Claims (5)

A barrier cap comprising a cap body which is attached to a container body and has a gas barrier layer formed as an intermediate layer in a base material layer, and a top lid which opens and closes the cap body,
The cap body includes an attachment part that is attached to the mouth of the container body, a partition wall that extends inward from the attachment part and closes the mouth, a pouring tube that stands from the partition wall, and a removal part that is defined by a breakable thin-walled weakened part in the partition wall inside the pouring tube,
This barrier cap is characterized in that, at the point where the member branches out from the removal part toward the attachment part, the thickness of the member that does not have a gas barrier layer inner layer is made thicker than the thickness of the member that does have a gas barrier layer inner layer, thereby balancing the flow of resin injected from the gate into the mold at the point where the member branches out from the removal part toward the attachment part . The member not having the gas barrier layer therein is a pouring tube,
2. The barrier cap according to claim 1, wherein the member on which the gas barrier layer is formed is a partition wall. The mounting portion includes an inner tube and an outer tube vertically disposed on either side of the mouth portion, and a base wall connected to the inner tube and the outer tube.
The member not having a gas barrier layer therein is an inner cylinder,
3. The barrier cap according to claim 1, wherein the member to which the gas barrier layer is applied is a base wall. The barrier cap according to any one of claims 1 to 3, characterized in that the barrier cap is a screw cap consisting of a cap body and a top lid that is screwed onto the cap body. The barrier cap according to any one of claims 1 to 3, characterized in that the barrier cap is a hinge cap consisting of a cap body and an upper lid connected to the cap body via a hinge.

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