JP2000103446A - Lid material for cup-shaped container, and cup-shaped container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a stable sealing treatment between a film-form lid material and an opening flange portion when the sealing is performed by superposing the peripheral end portion of the film-form lid material on the opening flange portion of a cup-shaped container main body, and heat-welding them, and facilitate a drinking by making the shape of a portion with which mouth comes into contact, on the surface of the flange portion, a rounded corner (chamfered from) when a content is drunk by directly placing mouth on the flange portion on the cup-shaped container after the cup-shaped container is unsealed. SOLUTION: A lid material A for a cup-shaped container wherein an approx. flat lid material film 1 is easily peelably heat-weld-sealed to a ring-shaped flange portion 3 having a lower flat surface 3b with an easy peel-off layer 2 equipped with both of heat-bondability and easy peelability, which is provided on the rear surface of the lid material film 1, is used to seal the opening portion of the cup-shaped container main body B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cup-shaped container made of plastic or paper, or a paper-made cup-shaped container reinforced with a plastic aggregate, and a sealed state of the lid. And a cup-shaped container covered with a cover.

[0002]

2. Description of the Related Art A lid material of a conventional cup-shaped container is shown in FIG.
As shown in the side sectional view of FIG. 5A and the top view of FIG. 5B, the side surface portion 1, the bottom surface portion 2, and the flange portion 5 are provided at the upper end of the side surface portion 1.
And a cover ring A having a concave shape as a whole, and a pull ring 7 (a finger hole 7) for opening the cover, which is joined and molded by an insert injection method in the vicinity of the lower end of the side surface portion 1.
a).

As shown in the figure, the pull ring 7 is joined to the concave cover material A via a ring-shaped inner plate 7c which is non-peelable and joined along the inner periphery of the lower end of the film-shaped side portion 1. Some are molded.

[0004] Such a conventional concave cover material A is made of a synthetic resin film (or synthetic resin sheet) provided with an easy peel-off layer having both heat sealability and easy peelability on the back surface, paper, aluminum foil, Alternatively, it is drawn and formed into a concave shape by using these composite materials.

[0005] The above-mentioned conventional concave cover material A is preliminarily joined and molded to the upper end opening of the side surface 11 of the cup-shaped container body B having the cylindrical side surface 11 and the bottom surface 12 by an insert injection method. The cup-shaped container body B is closed in a sealed state by superimposing it on a ring-shaped flange portion 13 attached with hermeticity, fusing it by applying heat and pressure.

When opening the sealed cup-shaped container, the pull ring 7 of the lid member A shown in FIG. 5A is pulled upward, and the base 7b of the pull ring 7 is pulled upward to obtain a film. The cup-shaped container can be opened by peeling the side surface portion 1 from the inside to the outside of the surface of the flange portion 13 of the cup-shaped container body B.

[0007]

In the case where the cup-shaped container body B is hermetically sealed with the recessed cover material A, the film of the recessed cover material A is formed on the ring-shaped flange portion 13 of the cup-shaped container body B. After laminating the peripheral edges of the film, the peripheral edge of the film is heated and pressed and fused to hermetically seal.

However, when the film-shaped peripheral end portion of the recessed cover material A is superimposed on the flange portion 13 of the cup-shaped container body B and is subjected to heating and pressurization to perform the fusing process, the recessed cover material A
The film-like peripheral edge of is soft.

For this reason, depending on the manner of the overlapping operation and the fusing operation, the position of overlapping with the flange portion 13 is not stable, or the shape of the film-shaped peripheral end portion is deformed by the stress of the overlapping operation. As a result, the sealing process may not be stable.

[0010] An object of the present invention is to provide a film-like lid material and an opening flange portion when the peripheral end portion of a film-like lid material is superposed on the opening flange portion of a cup-shaped container body and heat-sealed and hermetically sealed. The shape of the part of the surface of the flange that is in contact with the mouth when the cup is opened and the mouth is put directly on the flange after drinking Is to make it easier to drink by rounding.

[0011]

According to the first aspect of the present invention, a substantially flat cover material film is provided via an easy peel-off layer having both heat adhesion and easy peelability provided on a back surface thereof. A lid material for a cup-shaped container, which is heat-sealed so as to be easily peeled off from a ring-shaped flange portion having a lower flat surface.

[0012] Next, the invention according to claim 2 of the present invention is directed to an invention wherein the substantially flat lid material film is provided with an upper curved surface via an easy peel-off layer having both heat adhesion and easy peelability provided on the back surface thereof. A lid material for a cup-shaped container, wherein the lid material is heat-sealed so as to be easily peelable on an upper curved surface of a ring-shaped flange portion having a semi-cylindrical cross section having a lower flat surface.

Next, according to a third aspect of the present invention, in the lid material for a cup-shaped container according to the first or second aspect, the substantially flat lid material film is provided on the back surface. A cup-shaped seal that is easily peelable and heat-sealed to a ring-shaped flange having a lower flat surface by an insert injection method via an easy peel-off layer having both thermal adhesion and easy peelability. It is a container lid material.

Next, according to a fourth aspect of the present invention, there is provided the lid material for a cup-shaped container according to the first to third aspects of the present invention, wherein the substantially flat lid material film is attached to the ring-shaped lid material film. A lid material for a cup-shaped container, comprising: a pull tab extending in a ring outer peripheral region of a flange portion.

Next, according to a fifth aspect of the present invention, there is provided the lid material for a cup-shaped container according to the first to third aspects, wherein the surface of the substantially flat lid material film is
A lid material for a cup-shaped container, wherein the pull ring is heat-sealed.

Next, according to a sixth aspect of the present invention, there is provided the cup-shaped container lid according to the first to third aspects of the present invention, wherein the surface of the substantially flat lid material film is provided.
A lid material for a cup-shaped container, wherein a pull ring is heat-sealed by an insert injection method.

Next, according to a seventh aspect of the present invention, in the lid material for a cup-shaped container according to the first to sixth aspects of the present invention, the lower flat surface of the ring-shaped flange portion is concentric with the flange portion. A lid material for a cup-shaped container, comprising a plurality of ribs having one or more shapes.

Next, according to an eighth aspect of the present invention, there is provided the lid material for a cup-shaped container according to the first to seventh aspects, wherein the shape of the central portion of the substantially flat lid material film is formed. A lid material for a cup-shaped container characterized by having a convex shape formed by upward molding for absorbing a cooling negative pressure after hot filling.

According to a ninth aspect of the present invention, there is provided the cup-shaped container lid material according to the first to eighth aspects, wherein the lower flat surface is formed at the upper end of the opening of the cup-shaped container body. A cup-shaped container characterized in that it is heat-sealed and sealed to an upper flat surface of an opening flange portion which is joined and molded.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The lid material for a cup-shaped container of the present invention is
This will be described in detail below according to the embodiment.

As shown in the side sectional view of FIG. 1 (a), the cup-shaped container cover material A is provided on the back surface (lower surface) of the substantially flat cover material film 1 with heat adhesion and easy peelability. A peripheral end portion 1a of the lid material film 1 is heat-sealed on the upper surface of the ring-shaped flange portion 3 via the easy peel-off layer 2 so as to be easily peelable. The seal is heat-sealed so that it can be easily peeled off by the injection method.

The cover film 1 is made of one continuous synthetic resin film (or synthetic resin sheet), paper, aluminum foil, or a composite sheet material thereof. And an easy peel-off layer 2 having both thermal adhesion and easy peelability (easy cohesive failure).

The ring-shaped flange portion 3 is formed of a thermoplastic plastic such as polyethylene or polypropylene, has a ring shape in plan view, and may have a curved upper surface 3a as shown in FIG. Although a flat surface may be used, the lower surface 3b has a flat lower flat surface.

Further, the lid material A for a cup-shaped container of the present invention comprises:
As shown in FIG. 1A, the ring-shaped flange 3
Has an upper curved surface 3a and a lower flat surface 3b,
For example, it has a kamaboko-shaped cross section.

Further, the lid material A for a cup-shaped container of the present invention comprises:
As shown in FIG. 1A, the outer peripheral edge 1a of the lid material film 1
Is provided with an opening pull tab 1b protruding from the outer peripheral end of the ring-shaped flange portion 3 and extending therefrom.

The cup-shaped container cover material A of the present invention is used for covering the upper end opening of the cup-shaped container body B as shown in the side sectional view of FIG. Is
A tubular or trapezoidal side portion 11 and a bottom portion 12 are provided, and an opening flange portion 13 made of thermoplastic resin such as polyethylene or polypropylene is formed along the upper end opening of the side portion 11 to form an opening flange portion. The upper surface of 13 is a flat upper flat surface 13a. The outer edge 13b of the upper flat surface 13a (upper flat surface 1)
The crossing corner between 3a and the outer peripheral surface of the flange portion 13) may have an angular shape as shown in the figure, but is suitably formed into a rounded shape (chamfered shape).

As shown in FIGS. 1 (a) and 1 (b), the cup-shaped container lid member A has a lower flat surface 3b of the ring-shaped flange portion 3 and an upper flat surface 13a of the opening flange portion 13.
Lay on top.

Then, as shown in FIG. 2, the ring-shaped flange portion 3 and the opening flange portion 13 are aligned with each other so that the outer peripheral edges thereof do not protrude, and then positioned on the lower flat surface 3b and the upper flat surface 3b. The surface 13a is heat-sealed by ultrasonic heating or high-frequency heating to hermetically seal the cup-shaped container body B.

When opening the hermetically sealed cup-shaped container body B, as shown in FIG. 2, the pull tab 1b of the lid film 1 is pulled upward, and the lid film 1 is pulled up to the upper surface 3a of the ring-shaped flange portion 3. Open by peeling more.

Further, the lid material A for a cup-shaped container of the present invention comprises:
As shown in FIG. 1 (c), on the lower flat surface 3 b of the ring-shaped flange portion 3,
By providing at least two or more closed circular ribs 3c, the closed circular ribs 3c are superimposed on the upper flat surface 13a of the opening flange portion 13 and heat-sealed by ultrasonic heating or high-frequency heating. Is heat-fused while being crushed by melting,
This is to improve the hermetic sealing between the lower flat surface 3b and the upper flat surface 13a.

For example, as a lid material A for a cup-shaped container, for example, a ring-shaped flange portion having a semi-cylindrical cross section having an upper curved surface 3a and a lower flat surface 3b as shown in FIGS. When the opening 3 is used, the ring-shaped flange 3 curved in a semi-cylindrical shape remains on the opening flange 13 in the cup-shaped container body B after opening, as shown in FIG. In addition, when a mouth is attached to the opening flange portion 13 to drink a liquid beverage or the like filled in the container body B, it is possible to obtain an easy-to-drink feel without squaring.

Further, the lid material A for a cup-shaped container of the present invention
As shown in FIG.
As in the case of the lid member A shown in (a) and (b) (conventional example), the pull ring 7 is thermally fused, for example, the pull ring is thermally fused to the surface of the lid film 1 by an insert injection method. It may be something.

Further, the lid material A for a cup-shaped container of the present invention
As shown in the side sectional view of FIG. 3, the shape of the central portion of the substantially flat cover material film 1 has an upwardly convex negative pressure for absorbing a negative pressure for cooling after hot filling. An absorbing section M may be provided.

The convex shape is obtained by forming the lid material film 1 by drawing or relatively shallow concave / convex forming, and hot-filling the contents into the cup-shaped container body B.
Immediately after being hermetically sealed with the lid member A, when a negative pressure is generated in the container due to natural cooling or the like, the negative pressure is absorbed to deform the lid member A main body or the side portion 11 of the cup-shaped container main body B. This is for absorbing (preventing) deformation and depression of the bottom surface portion 12 and the like.

Further, the lid material A for a cup-shaped container of the present invention comprises:
As shown in the side sectional view of FIG. 4, an outer engaging flange portion 3d is provided at an outer peripheral end of the ring of the ring-shaped flange portion 3,
An inner engaging flange portion 3e is provided at the inner peripheral end of the ring, and a fitting concave portion is formed in the ring-shaped flange portion 3 by a lower flat surface 3b, an outer engaging flange portion 3d, and an inner engaging flange portion 3e. The ring-shaped opening flange portion 13 of the cup-shaped container body B is fitted at the inner and outer circumferences.

This facilitates alignment between the ring-shaped flange 3 of the cup-shaped container lid A and the opening flange 13 of the cup-shaped container main body B. FIG.
The opening flange portion 13 of the cup-shaped container body B using the cup-shaped container lid material A of the present invention provided with the closed circular rib 3c on the lower flat surface 3b of the ring-shaped flange portion 3 as shown in FIG. When superimposed on the upper flat surface 13a and heat-sealed by ultrasonic heating or high-frequency heating, the closed circular rib 3c expands on the superimposed inner surface while being crushed by melting,
This prevents the molten resin from escaping outward, and the escaping resin impairs the appearance of the cup-shaped container after the hermetically sealed seal and makes the mouthfeel worse when used as a drinking spout. Can be prevented.

The cover material A of the present invention is formed of a sealing single-layer film or a multi-layer film laminated and laminated. The surface of the cover material A is provided with a thermoplastic synthetic resin layer, and the back surface is formed of a heat-adhesive resin. A single-layer film or a multi-layer film, a synthetic resin film such as polyethylene, polypropylene, polyethylene terephthalate, a composite film of a synthetic resin film and paper, Alternatively, a composite film of such a film and an aluminum foil can be used.

For example, as the cover material A, in order from the outer surface,
Unstretched polypropylene 50 μm / polypropylene sheet 200 μm / ethylene-vinyl alcohol copolymer 15
A layer obtained by laminating 50 μm (gas barrier layer) / 50 μm easy peel material (easily peelable adhesive layer; for example, a resin material obtained by blending a polyolefin resin with a polybutene resin) can be used.

Further, for example, the side portion 11 and the bottom portion 12 of the cup-shaped container body B may be made of a plastic material, but in the case of the cup-shaped container body B mainly made of paper, cup paper (cup base paper) is used. In the order from the outer surface of the cup container body A, unstretched polypropylene 30 μm /
Linear polyethylene 20 μm / paper (440 g / m ² ) /
Direct mold polyethylene 20μm / polyethylene 15μm /
Ceramic deposited polyethylene terephthalate 12μm /
Those obtained by laminating and laminating 60 μm of undrawn polypropylene can be used.

Further, the lid material A for a cup-shaped container of the present invention
Pull ring 7 for opening as shown in FIGS.
When joining, the pull ring 7, the ring-shaped inner plate 7
c, As the thermoplastic synthetic resin used for the flange portion 13, the flange outer plate 14, the flange plate 15, etc. of the cup-shaped container body B, polyethylene, polypropylene, polyethylene terephthalate, block polymerization type polypropylene resin and the like can be used.

[0041]

Next, specific examples of the cup-shaped container lid material A of the present invention and the cup-shaped container hermetically sealed using the cup-shaped container lid material A of the present invention will be described below.

<Example 1> Dry lamination was performed in a laminated structure of a non-stretched polypropylene layer / polypropylene sheet layer / ethylene-vinyl alcohol copolymer layer / polyvinylidene chloride-coated unstretched nylon layer / polypropylene easy peel material layer. A laminated sheet was formed.

Subsequently, the laminated sheet is punched into a size corresponding to a predetermined planar shape of the lid material for the cup-shaped container, including the pull tab 1b, and hot-pressed or drawn as necessary. A lid material film 1 was produced by forming a negative pressure absorbing portion M having a convex shape facing upward for absorption of cooling negative pressure after filling.

Next, the lid material film 1 is loaded into an insert injection mold, and the inner surface side (easy peel material layer side) of the peripheral end portion 1a of the lid material film 1 is
Injection molding with polypropylene molten resin to form and process the ring-shaped flange portion 3 having a semi-cylindrical cross-section having the upper curved surface 3a and the lower flat surface 3b, so that the ring-shaped flange portion 3 can be easily peeled. A cover material A for a cup-shaped container of the present invention in which a cover material film 1 was tightly sealed.

In addition, if necessary, the inner side of the outer end 1a of the lid material film 1 (on the side of the non-stretched polypropylene layer opposite to the easy peel material layer) may be injected with a molten polypropylene resin. Molding,
A pull ring portion 7 or a ring-shaped inner plate 7c provided with the pull ring portion 7 was joined and formed on the outer surface side of the lid material film 1 to prepare a cup-shaped container lid material A of the present invention.

<Example 2> Along the upper end opening (upper end of the side surface portion 11) of the cup-shaped container body B, an opening flange portion 13 is formed in a ring shape around the entire periphery by injection molding (or a ring shape preformed). The flange part was attached by fitting). For the opening flange portion 13, a resin material and a shape capable of being heat-sealed to the ring-shaped flange portion 3 of the cup-shaped container lid member A in Example 1 without any gap were used.

The laminated structure of the cup-shaped container body B is such that polypropylene / paper /
Polypropylene or, if necessary, a laminate of polyethylene, polyethylene terephthalate, nylon, a vapor-deposited film, aluminum foil or the like between layers can be used.

Specifically, a cup-shaped container body B having the following laminated structure was used. (Container outer surface side) Unstretched polypropylene 50 µm / S polyethylene 15 µm / paper 300 g / S polyethylene 20 µ
m / EX polyethylene 15 μm (or drawn nylon) /
Silica-deposited polyethylene terephthalate 12 μm (or aluminum-deposited polyethylene terephthalate or aluminum foil) / undrawn polypropylene 50 μm (inside of container)

Next, after the cup-shaped container body B is filled with a predetermined liquid content, the lower flat surface 3b of the ring-shaped flange portion 3 of the cup-shaped container cover material A is opened. After superimposing on the upper flat surface 13b of the flange portion 13 and covering the opening of the cup-shaped container body B, an ultrasonic horn is brought close to the lid material A to form an ultrasonic seal system (or a high-frequency seal system, an electric heat seal). Method) lid material A
The superposed surface of the lower flat surface 3a and the upper flat surface 13b of the cup-shaped container body B was heated and melt-sealed to cover in a sealed state, thereby producing a cup-shaped container of the present invention.

[0050]

According to the lid material for a cup-shaped container of the present invention, a relatively soft plastic ring-shaped flange portion is fusion-sealed to a peripheral end portion of a relatively soft lid material film. There is no such softness and the shape is extremely stable structurally, so when the peripheral end of the lid material is overlapped and fused with the upper opening flange of the cup-shaped container body, The overlapping position of the lid material is not stabilized, and the shape of the peripheral end of the lid material does not deform due to the stress of the overlapping operation,
This has the effect of improving the stability of hermetic sealing of the opening of the cup-shaped container body.

The cup-shaped container covered with the sealing material using the lid material of the present invention can ensure a reliable hermetic sealing property, and a portion of the cup-shaped container body which is in contact with the opening of the opening flange portion. Is made into a rounded shape such as a kamaboko shape, so that when the cup-shaped container is opened and the mouth is directly attached to the flange portion of the cup-shaped container for drinking, it is easy to drink.

[Brief description of the drawings]

1 (a) is a side sectional view showing an embodiment of a cup-shaped container lid material of the present invention, (b) is a side sectional view of a cup-shaped container covered with the cup-shaped container lid material, (C) is a sectional side view showing another embodiment of the lid material for a cup-shaped container of the present invention.

FIG. 2 is an overall sectional side view of a cup-shaped container covered with an opening of a cup-shaped container main body using the cup-shaped container lid material of the present invention.

FIG. 3 is an overall cross-sectional side view of a cup-shaped container lid material according to another embodiment of the present invention, and a cup-shaped container covered with an opening of a cup-shaped container body using the lid material.

FIG. 4 is a cross-sectional side view of another embodiment of the cup-shaped container lid member of the present invention, and a cup-shaped container covered with an opening of a cup-shaped container body using the lid member.

FIG. 5A is a side sectional view of a conventional cup-shaped container lid, and FIG. 5B is a top view thereof.

[Explanation of symbols]

A: lid material B: cup-shaped container body 1: lid material film 1a: peripheral end 1b: pull tab 2
... Easy peel material layer 3 ... Ring-shaped flange portion 3a ... Top surface 3b ... Bottom surface 3
c: rib 3d: outer engaging portion 3e: inner engaging portion 5: flange portion 7
Opening pull ring 7a Finger hole 7b Base 7c Ring inner plate 11 Side surface 12 Bottom surface 13 Ring flange 13a Upper flat surface 13b Outer edge

Continued on the front page F-term (reference) 3E067 AA03 AB26 BA07A BB01A BB14A BB15A BB16A BB25A BC03A BC07A EA06 EA29 EA32 EB11 EB12 EB27 FA01 FC01 GD07 3E084 AA02 AA12 AA24 AA34 CC01 CC08 CC08 GB17 KB01 LA02 LA03

Claims (9)

[Claims] 1. A substantially flat lid material film can be easily peeled off to a ring-shaped flange portion having a lower flat surface via an easy peel-off layer having both thermal adhesiveness and easy peelability provided on the back surface thereof. A lid material for a cup-shaped container, which is heat-sealed. 2. A substantially flat lid material film having a semi-cylindrical cross-section having an upper curved surface and a lower flat surface via an easy peel-off layer having both heat adhesion and easy peelability provided on the back surface thereof. A lid material for a cup-shaped container, wherein the lid material is heat-sealed to the upper curved surface of the ring-shaped flange portion so as to be easily peelable. 3. The lid material for a cup-shaped container according to claim 1, wherein the substantially flat lid material film comprises:
Through an easy peel-off layer having both thermal adhesiveness and easy peelability provided on its back surface, it is heat-sealed so as to be easily peelable to a ring-shaped flange portion having a lower flat surface by an insert injection method. Characteristic lid material for cup-shaped containers. 4. The lid material for a cup-shaped container according to claim 1, wherein said substantially flat lid material film comprises:
A lid material for a cup-shaped container, comprising: a pull tab extending in a ring outer peripheral region of the ring-shaped flange portion. 5. The cup-shaped container lid material according to claim 1, wherein a pull ring is heat-sealed to the surface of the substantially flat lid material film. Cover material. 6. The lid material for a cup-shaped container according to claim 1, wherein a pull ring is heat-sealed to the surface of the substantially flat lid material film by an insert injection method. Cover material for a cup-shaped container. 7. The lid material for a cup-shaped container according to claim 1, wherein one or two or more ribs concentric with the flange portion are provided on a lower flat surface of the ring-shaped flange portion. Cover material for a cup-shaped container. 8. A lid material for a cup-shaped container according to claim 1, wherein the shape of the central portion of said substantially flat lid material film is for absorbing a cooling negative pressure after hot filling. A cover material for a cup-shaped container, wherein the cover material has a convex shape formed by an upward forming process. 9. The cup-shaped container lid material according to claim 1, wherein the lower flat surface is formed on the upper flat surface of an opening flange portion formed by joining the upper end portion of the opening of the cup-shaped container body. A cup-shaped container which is fusion-sealed.