JPH08198306A - Spouting cap - Google Patents

Abstract

PURPOSE: To obtain an excellent flavor keeping property and easy-to-open property of a spouting cap to be mounted on the mouth of a container, by a method wherein a backing member-to be provided on the back of the mouth wall of the cap is made of a laminate of a metallic foil, a protective resin layer and a peelable resin layer. CONSTITUTION: A prearranged opening part 4 on the mouth wall of a spouting cap main body is surrounded by a weakened part 5 and provided with a pull tab. A backing member 24 is made of a laminate of a metallic foil 25, a protective resin layer 26 provided, on one side of the metallic layer 25 and a peelable heat seal resin layer 27 provided on the other side of the metallic foil 25, and its peripheral edge 28 protrudes outside the weakened part 5a little. The backing member 24 is heat-sealed on the back of the mouth wall of the cap main body via the peelable heat seal resin layer 27. When the cap is opened, the weakened part 5 is broken, the backing member 24 outside the weakened part 5 is peeled off from the mouth wall so that the whole backing member 24 is removed together with the prearranged opening part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouring cap mounted on the mouth of a container and more specifically,
It has a combination of excellent flavor retention and easy opening,
Moreover, the present invention relates to a pouring cap having excellent sanitary properties and appearance properties after opening.

[0002]

2. Description of the Related Art Conventionally, as a pouring cap that is used by being attached to the mouth of a container, a planned opening portion provided on the mouth wall of the cap body and a weakened portion that defines the periphery of the planned opening portion are provided.
It is known that an opening gripping portion is provided at a planned opening portion and the weakened portion is broken to form a spout.

In this pouring cap, the above-mentioned weakened portion has a thinner wall thickness than the other portions, and the scent component of the contents such as liquid seasoning penetrates and leaks through this weakened portion. However, there is a problem that the flavor retaining property of the content product is deteriorated.

In order to solve this problem, for example, real fairness 4
As disclosed in JP-A-39174, it has been proposed to bond a metal foil laminate to the back surface of the mouth wall to suppress permeation of scent components and gas from the weakened portion.

[0005]

Although the conventional metal foil backing cap is excellent in suppressing permeation of scent components and gas from the weakened portion, it is simultaneously opened at the same time as the weakened portion and the metal foil laminate. Since it is necessary to rupture also, there is a problem that the opening force becomes large and it is difficult to open.

Further, when the opening portion is removed to form the spout, the cut pieces of the metal laminate are exposed in the peripheral portion of the spout, and this is transferred to the contents, which is a sanitary problem and the appearance of the spout. There is also a problem in terms of appearance and commercial value that it becomes unsightly.

Therefore, an object of the present invention is to solve the above-mentioned problems in the conventional metal foil backing cap, to have a combination of excellent flavor retention and easy opening property, and further to have hygienic characteristics and appearance after opening. The purpose of this is to provide a pouring cap that has excellent dynamic characteristics.

[0008]

According to the present invention, a portion to be opened provided on the mouth wall of the cap body, a weakened portion for defining the periphery of the portion to be opened, and an opening provided to the portion to be opened are provided. In a pouring cap having a grip portion and breaking the weakened portion to form a spout, the protective resin layer provided on one surface of the metal foil and the metal foil and the other surface of the metal foil are provided. A backing member made of a laminate with a peelable heat-sealing resin layer and having a shape similar to the planned opening portion and an outer edge larger than the weakened portion is formed on the back surface of the mouth wall of the cap body, and the backing member completely covers the weakened portion. It is formed by heat-bonding through the peelable heat-sealing resin layer so that the outer edge thereof extends outside the weakened portion by a small distance. Peel between the backing member and the mouth wall, Pouring cap whole person member is characterized in that so as to be removed together with the aperture scheduled portion is provided.

In the present invention, the peelable heat seal resin is heat sealable, and peeling at the heat seal interface or cohesive failure in the heat seal resin layer in the vicinity of the interface can be easily performed by opening force by hand. The peelable heat-seal resin is a continuous phase made of an olefin resin and a dispersed phase made of an olefin resin or a vinyl resin other than the olefin resin of the continuous phase. It is preferable that the polymer alloy is composed of

[0010]

In the present invention, as a backing member provided on the back surface of the mouth wall of the pouring cap, a metal foil and a protective resin layer provided on one surface of the metal foil and a peelable heat seal resin provided on the other surface of the metal foil. A layer stack is used.

The metal foil of this laminate is a barrier that blocks the permeation of scent components and gases, and the protective resin layer prevents contact between the metal foil and the contents, and the corrosion of the metal foil and the penetration of the metal contents into the contents. And the metal foil is reinforced to enhance the mechanical strength of the laminate. Further, the peelable heat-sealing resin layer of the laminated body enables a heat adhesive layer between the cap opening wall and the metal foil laminated body, and imparts easy peeling property (peelability) to the adhesive surface.

This laminated body is cut into a backing member having a similar shape to a portion to be opened, that is, a portion to be removed at the time of opening, and having an outer edge slightly larger than the weakened portion. As a result, the backing member can completely cover the planned opening portion and the weakened portion with respect to the cap mouth wall, and the thermal bonding can be performed even in the portion protruding from the weakened portion by a small distance.

According to the present invention, the backing member is heat-bonded to the back surface of the cap mouth wall via the peelable heat-sealing resin layer, and the backing member completely covers the weakened portion. The outer edge is positioned so that it extends a small distance outside the weakened portion.

Since the backing member including the metal foil completely covers the weakened portion and the outer edge of the backing member is slightly extended to the outside of the weakened portion, the backing member is heat-bonded, so that the backing member passes through the weakened portion. Permeation of scent components and gases is almost completely blocked, resulting in excellent flavor retention.

Also in the pouring cap of the present invention, the opening gripping portion is lifted and the weakened portion is broken to open the opening. However, compared with the bonding area between the planned opening portion and the backing member, the portion outside the weakened portion is exposed. Since the adhesion area between the mouth wall and the backing member is quite small and the adhesion surface is peelable, peeling occurs between the backing member outside the weakened part and the mouth wall during opening, and the backing member At least the metal foil of the member is to be removed while being entirely integrated with the planned opening.

According to the present invention, since the metal foil laminated body can be removed by peeling the laminated body without breaking the laminated body,
As compared with the conventional backing cap, the opening force can be reduced, and there is an advantage that opening with a finger is easy. Further, since it is not necessary to break the laminate, it also has an effect that the thickness of the metal foil and the thickness of the protective resin layer in the laminate can be increased so that sufficient barrier properties and strength can be obtained. There is.

Furthermore, since the entire backing member is removed together with the planned opening portion, and no fragments or the like remain at the spout,
There are no so-called dusting problems, excellent hygienic properties, and the appearance after opening is also very good.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a sectional view of the pouring cap of this embodiment mounted on a bottle with the upper lid open, and FIG. 2 is seen from the container mounting side in the state where the bottle with the upper lid opened is not mounted. FIG. FIG. 3 is a perspective view showing the pouring cap with the planned opening portion removed.

The spouting cap 1 of the present invention is roughly composed of a cap body 2, an intended opening portion 4 provided on a mouth wall 3 thereof, a weakening portion 5 which defines the periphery of the intended opening portion, and an opening. And an opening gripping portion 6 provided at a predetermined portion,
The weakened part 5 is broken, the planned opening part 4 is removed, and the spout 7
(FIG. 3).

In the pouring cap of this embodiment, the cap body 1 has an outer cylinder 9 that engages with the outer periphery of the bottle mouth portion 8,
An inner cylinder 10 that engages with the inner periphery of the bottle mouth portion 8 and a ring-shaped peripheral wall portion 11 that engages with the upper surface of the bottle mouth portion 8 are provided, and a spout cylinder 12 is provided above the ring-shaped peripheral wall portion 11. Are formed. An end portion 13 for draining the contents is formed at the tip of the dispensing cylinder 12. Inside the ring-shaped peripheral wall portion 11, a mouth wall 3 is formed integrally therewith.

A part of the outer periphery of the ring-shaped peripheral wall portion 11 is integrally provided with a hinge 14 so as to integrally form an upper lid 15 having the same diameter as the outer cylinder 9.
Is openable and closable. That is, the upper lid 15 is composed of a top plate portion 16 and a short skirt portion 17 so that the pouring tube 12 can be housed therein. Top lid 15
In order to fix the valve in the closed position, a protrusion 18 is formed in the lower portion of the spout barrel 12, while a recess 19 is formed in the inner periphery of the skirt portion 17. The upper lid is fixed. Further, an opening knob 20 is formed on the outer periphery of the skirt portion 17 on the opposite side of the hinge 14, and the upper lid 15 can be opened by pushing up the knob 20 with a finger. In order to stabilize the upper lid 15 in the open position shown in FIG. 1, bridges 21 and 21 acting as tension springs are provided on both sides of the hinge 14 substantially in parallel with each other and at a small interval and on the lower side. When the upper lid 15 is opened, it is stabilized in the state shown in FIG. 1 so that the upper lid 15 does not vibrate or swing.

The shape of the planned opening portion 4 surrounded by the weakened portion 5 is such that the weakened portion 5 easily breaks, the planned opening portion 4 is easily removed, and the contents can be easily poured. The shape is not particularly limited as long as it is performed, but a shape in which stress concentration occurs at the start of opening is preferable because the most force is required to start opening.

In the specific example shown in FIG. 2, the fan-shaped planned opening portion 4 is formed by using the root portion 22 of the opening grip portion (pull ring) 6 as a key. In the shape of the planned opening portion 4, stress concentration occurs in a necessary portion, and the weakened portion 5 in this portion first breaks, then the broken portion 5 becomes a V shape and gradually expands. The semi-arcuate portion is broken, and the planned opening portion 4 can be removed.

As shown in the enlarged cross-sectional view of FIG. 4, the weakened portion 5 for partitioning the planned opening portion 4 from the mouth wall 3 is composed of a substantially V-shaped groove, and is weakened by the presence of the thin portion 23. ing. In this thin portion 23, since the plastic is thinner than the other portions, permeation of flavor components and gas occurs in a non-negligible order, which impairs the flavor of the contents.

In order to prevent this, a backing member 24 having a gas barrier property is provided. In the present invention, the backing member 24 is made of a specific laminated material and has a specific positional relationship with the mouth. Attach it to the back of the wall 3.

In FIG. 4, which shows the cross-sectional structure of the backing member 24 and how it is mounted on the mouth wall, the backing member 24 is made of metal foil 2.
5. Protective resin layer 26 provided on one side of the metal foil with an adhesive layer (not shown) if necessary, and peelable provided on the other side of the metal foil with an adhesive layer if necessary. It is composed of a laminated body of the heat seal resin layer 27.

The backing member 24 is heat-bonded so that the peelable heat-sealing resin layer 27 faces the back surface of the mouth wall 3, but the backing member 24 is similar to the planned opening portion 4 and has an outer edge. Has a shape slightly larger than the weakened portion 5,
The backing member 24 completely covers the weakened portion 5 and the outer edge 2 thereof.
The peelable heat-sealing resin layer 27 is heat-bonded so that 8 extends outside the weakened portion 5 by a small distance.

According to this coating structure, the thin portion 23 is completely covered with the high barrier metal foil 25 adhered to the heat-sealable resin layer 27, so that the permeation of the flavor component through the thin portion is almost completely achieved. In addition to being preventable, the heat seal is a peelable heat seal. Therefore, at the time of opening, the weakened portion 5 is first broken and then peeled off between the backing member 24 outside the weakened portion and the mouth wall 3, This member 2
The whole 4 can be removed together with the planned opening portion 4.
When the backing member 24 is broken at the same time as the weakened portion 5, since the backing member includes a high-strength metal foil and a protective resin layer, a large force is required to break the backing member, which makes it difficult to open. However, according to the present invention, the peeling between the backing member 24 outside the weakened portion and the mouth wall 3 is performed by utilizing the peelable property of the heat-sealable resin layer without breaking the backing member. Since it is performed, the opening of the planned opening portion 4 is easy. Further, since the cut end of the backing member does not remain at the spout, the appearance after opening is remarkably good.

As the metal foil 25 used for the backing member,
Light metal foil such as pure aluminum and aluminum alloy, iron foil, steel foil,
Tin foil and other surface-treated steel foil are used, and the thickness thereof is preferably in the range of 7 to 15 μm.

As the protective resin layer 26 of the backing member, a biaxially stretched polyester film, a biaxially stretched nylon film, a biaxially stretched polypropylene film, or the like having excellent mechanical strength and barrier properties against corrosive components is used.
A thickness of 10 to 20 μm is generally suitable.

The peelable heat-sealable resin layer 27 of the backing member is heat-sealable, and peeling at the heat-seal interface or cohesive failure in the heat-seal resin layer near the interface is easy by opening force by hand. Any one can be used as long as it is performed at a sealing strength of 0.
3-2.0 kg / 15 mm width, especially 0.5-1.5 kg
Those having a width of / 15 mm are suitable.

As the heat-sealable resin, an olefin resin, a low melting point copolyamide, a low melting point copolyester, various vinyl resins, or a blend thereof, which gives the above-mentioned sealing strength, is used as the cap body. Used in connection with resins. Generally, a thickness of 20 to 40 μm is suitable.

A particularly preferable heat-sealing resin is a polymer alloy composed of a continuous phase made of an olefin resin and a dispersed phase made of an olefin resin other than the olefin resin of the continuous phase or a vinyl resin.

As the continuous phase olefin resin in the polymer alloy, low-medium- or high-density polyethylene,
Examples include linear low density polyethylene, homopolypropylene, crystalline propylene-ethylene copolymer, polybutene-1, polypentene-1, butene-1 / propylene copolymer, butene-1 / propylene / ethylene terpolymer. You can In terms of heat resistance, homopolypropylene is preferred.

An olefin resin different from the olefin resin of the continuous phase is used as the olefin resin for the dispersed phase. For example, when the continuous phase is a propylene resin, an ethylene resin is used as the dispersed phase, and vice versa. When the continuous phase is an ethylene resin, a propylene resin can be used as the dispersed phase.

Examples of the resin other than the olefin resin for the dispersed phase include a styrene resin, a (meth) acrylic acid ester resin, and other vinyl resins. These dispersed phase resins are continuous phase olefin resins. It may be simply dispersed in the resin or may be graft-polymerized.

The ratio of continuous phase resin to dispersed phase resin should generally be present in a weight ratio of 90:10 to 50:50, preferably 80:20 to 60:40. The particle size of the dispersion layer is generally in the range of 0.1 to 5 μm, preferably 0.3 to 3 μm.

Suitable peelable heat-sealable resin films are available as VMX films from Mitsubishi Chemical Co., Ltd. and Wada Chemical Industry Co., Ltd.

The most preferable laminate for the backing member is VM
An example is a laminate of X film 30 μm / aluminum foil 7 μm / PET film 25 μm.

As the resin forming the cap body 2,
Any thermoplastic resin may be used, but olefinic resins such as low-medium- or high-density polyethylene, linear low density polyethylene, homopolypropylene, crystalline propylene-ethylene copolymers, polybutene-1, polypentene-1. , Butene-1 / propylene copolymer, butene-
A 1 / propylene / ethylene terpolymer or the like is suitable.

The thickness of the portion to be opened 4 of the cap body is not particularly limited, but it is generally 0.8 to 1.5 mm, preferably 1.0 to 1.2 mm. The thickness of the thin portion is appropriately 0.15 to 0.25 mm, preferably 0.18 to 0.2 mm, in view of the balance between sealing reliability and easy opening.

The protrusion dimension (l) of the outer edge portion 28 of the backing member 24 from the weakened portion 5 is generally 0.2 to 2.5 m.
m, particularly 0.3 to 1.0 mm, is suitable. If it is smaller than the above range, the barrier property against flavor is impaired, while if it is larger than the above range, the opening property tends to deteriorate.

The spout cap of the present invention is manufactured by inserting the backing member 24 in the mold in a positioned state and injection molding a resin for forming the cap body. Due to the temperature of the injection-molded resin, peelable heat sealing between the backing member and the cap body resin is performed simultaneously.

[0045]

According to the present invention, the backing member is formed of a specific laminated material and is attached to the back surface of the mouth wall in a specific positional relationship to form a peelable heat seal therebetween. In addition, the weakened portion is broken at the time of opening, and then the backing member outside the weakened portion is separated from the mouth wall, and the entire backing member is integrally removed with the planned opening portion. This makes it possible to solve the above-mentioned problems in the conventional metal foil backing cap, to have a combination of excellent flavor retention and easy opening, and to have hygienic properties and appearance after opening. It is possible to provide a pouring cap having excellent characteristics.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pouring cap of the present embodiment attached to a bottle and shown with an upper lid opened.

FIG. 2 is a plan view of the cap of FIG. 1 seen from the container mounting side in a state where the bottle with the upper lid opened is not attached.

FIG. 3 is a perspective view showing the pouring cap of FIG. 1 with a planned opening portion removed.

FIG. 4 is an enlarged cross-sectional view showing a cross-sectional structure of a backing member and a mounting state on a mouth wall.

Claims (2)

[Claims] 1. A weakened portion provided with a planned opening portion provided on the mouth wall of the cap body, a weakening portion that defines the periphery of the planned opening portion, and an opening gripping portion provided at the planned opening portion. In a pouring cap that breaks to form a spout, a laminate of a metal foil and a protective resin layer provided on one surface of the metal foil and a peelable heat seal resin layer provided on the other surface of the metal foil. A backing member having a shape similar to that of the planned opening portion and having an outer edge slightly larger than the weakened portion on the back surface of the mouth wall of the cap body, the backing member completely covering the weakened portion, and the outer edge of Formed by heat-bonding via the peelable heat-sealing resin layer so as to extend outward a small distance, the weakened portion breaks at the time of opening, and then between the backing member and the mouth wall outside the weakened portion. Peel off the entire backing member with the planned opening. A pouring cap that is designed to be removed from the body. 2. The peelable heat seal resin is a polymer alloy composed of a continuous phase made of an olefin resin and a dispersed phase made of an olefin resin other than the olefin resin of the continuous phase or a vinyl resin. 1
The pouring cap described.