JP2009241967A - Lid material of packaging container - Google Patents

Abstract

A sheet-like lid material for a cup-shaped container is provided which has a shape retaining property without having an aluminum layer.
A sheet-like lid member 20 that closes a cup-shaped container body 10 is formed of a laminate including at least a seal layer and a paper layer for fixing to the outer periphery of the opening. An elongated tear tape 30 is disposed on the lower surface side of the paper layer. The tear tape 30 extends substantially orthogonal to the imaginary line connecting the opening tab and the center C at a position opposite to the opening tab 21 with respect to the lid material center C. At least one end of the tear tape protrudes from the outer peripheral edge of the lid member together with the layers positioned above and below the tear tape to form a knob 32. When the knob portion 32 is picked and peeled off, a part of the paper layer located on the tear tape is removed, and the lid material strength in the region is weakened. As a result, even if the aluminum layer is not present, it is possible to realize the shape retention at the time of opening and closing by using gravity.
[Selection] Figure 2

Description

  The present invention relates to a sheet-like lid material used for packaging containers such as cup ramen and other instant foods.

  For example, as shown in FIG. 1, it is preferable that the sheet-like lid member 20 used for a cup ramen container can maintain an open state well while pouring hot water. For this reason, usually, the shape retention is improved by forming the lid member 20 as a laminated structure including a paper layer, an adhesive layer, an aluminum layer, and a heat-sealable plastic layer. That is, by including an aluminum layer in the laminated structure, the aluminum layer retains the flatness of the individual cover members 20 stacked in the manufacturing plant at the time of production. When pouring hot water into the body, the curved unsealed state of the partially opened lid member 20 is maintained.

However, when the lid 20 includes an aluminum layer, there are the following disadvantages.
(1) It becomes impossible to perform a foreign matter contamination inspection using a metal detector for a cup ramen as a final product. This is because the aluminum layer reacts to the metal detector.
(2) During waste incineration, aluminum remains in the incinerator and adheres to the inner wall of the incinerator.
(3) When cooking by a microwave oven is performed, sparks may occur at the outer periphery of the aluminum layer.

  In order to solve such a problem, it is necessary to omit the aluminum layer in the laminated structure of the lid material. From this point of view, the applicant of the present application has already developed a cover material that ensures shape retention while omitting the aluminum layer, and has applied for a patent (Patent Documents 1 and 2).

In Patent Documents 1 and 2, the aluminum layer is omitted from the laminated structure of the sheet-like lid material, and a plastic substrate layer is provided. And the easily-curved belt | band | zone area | region is provided in the opening direction substantially intermediate part of the sheet-like cover material.
This easily curved belt-like region is composed of a plurality of parallel half cuts penetrating the plastic substrate layer, thereby ensuring good shape retention.

JP 2002-104513 A JP 2003-095336 A

  An object of the present invention is to provide a lid member that has a shape retaining property without having an aluminum layer, by a method different from the above-described conventional technique.

The sheet-like lid material of the present invention has an opening tab on the outer peripheral edge, and is fixed to the outer peripheral edge of the cup-shaped container body so as to be peeled off. The sheet-like lid member is composed of a laminate including at least a sealing layer for fixing to the outer periphery of the opening and a paper layer, and an elongated tear tape is disposed on the lower surface side of the paper layer.
The tear tape extends substantially perpendicular to the imaginary line connecting the opening tab and the center at a position passing through the center of the sheet-like lid member or a position opposite to the opening tab with respect to the center. .
When at least one of both ends of the tear tape protrudes from the outer peripheral edge of the lid material together with the layers positioned above and below the tear tape, a knob is formed, and when the knob is picked and peeled off, A part of the paper layer located in the area is removed, and the strength of the lid material in the region is weakened (the stiffness of the lid material is eliminated).

  After the tear tape is peeled off, the sheet-like lid member is not stiff, so that the sheet-like lid member has shape retention in both the open state and the closed state due to the influence of gravity. In this way, it is possible to realize a sheet-like lid material having shape retention while omitting the aluminum layer.

From the viewpoint of weakening the lid material strength (no stiffness), the paper layer on the tear tape is preferably partially removed rather than simply broken, in order to ensure this. For example, the tear tape should be adhered to the paper layer located on it with an adhesive, or a release layer may be provided on the opposite side of the tear tape to the paper layer. Is preferred.
In addition, as will be described in detail later, a paper layer is provided by providing a structure that can partially remove the paper layer by using a half cut or a cut at a position near the knob portion formed at the end of the tear tape. Can be ensured to be partially removed.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The sheet-like lid material 20 of the present invention has a tab 21 for opening on the outer peripheral edge and is fixed to the outer peripheral edge 11 of the cup-like container 10 so as to be peeled off. In this respect, as shown in FIG. This is the same as the conventional example.
As will be described with reference to FIG. 2 and subsequent figures, the sheet-like lid member 20 of the present invention is characterized in that a tear tape 30 is provided.

≪Overall configuration of cup≫
FIG. 2 is a perspective view showing the cup-shaped container 10 provided with the sheet-like lid member 20 of the present invention, and FIG. 4 shows a cross section taken along line 4-4 in FIG.
As shown in the cross-sectional view of FIG. 4, the sheet-like lid member 20 includes, in order from the front side, “paper layer”, “PE (polyethylene) layer”, “PET (polyethylene terephthalate) base material layer”, “heat seal layer”. Is provided.
The “paper layer” is a layer on which printing is performed, and this paper layer is bonded to the “PET base material layer” using the “PE layer” as an adhesive layer. The lowermost “heat seal layer” is a seal layer for adhering the lid member 20 to the outer peripheral edge (flange) 11 of the cup-shaped container 10 in a peelable manner.
On the lower surface side of the “paper layer”, a tear tape (tearing tape) 30 is arranged. As shown in FIG. 2, both ends 31 and 32 of the tier tape 30 protrude from the outer peripheral edge of the lid member together with the layers positioned above and below the tier tape 30 to form knobs 31 and 32. .

The knobs 31 and 32 protruding from the outer peripheral edge are for the consumer to pick up and tear off the tear tape 30. Therefore, it is not always necessary that the both ends 31 and 32 of the tear tape protrude as the knob, and it is sufficient that at least one end protrudes.
The tier tape 30 itself is generally known, and in the present invention, the tier tape 30 is made of an appropriate material as long as it can be peeled off without losing the strength of the paper layer. can do.

≪How to use≫
A consumer picks one of the knobs 31 and 32 protruding at both ends of the tear tape 30 during eating, and peels off the tear tape 30. As a result, a partial region 33 of the “paper layer” (region indicated by hatching in FIG. 4) is removed, or at least the “paper layer” is broken. Therefore, the strength of the “paper layer” becomes weak (no stiffness) at that portion.
As a result, as shown in FIG. 3, the opening state can be maintained well by using gravity, which is convenient for pouring hot water. Further, since the stiffness of the “paper layer” is simply eliminated by removing the tear tape 30, it is easy to maintain the closed state by the action of gravity even when steaming the men.

<< Configuration to ensure that the partial region 33 of the paper layer shown in FIG. 4 is removed >>
As described above, in the present invention, the tear tape 30 is peeled off to eliminate the stiffness of the sheet-like lid member 20, thereby obtaining shape retention. Here, if at least the “paper layer” located above the tear tape 30 is broken, the strength of the sheet-like lid member 20 is weakened, and stiffness can be eliminated.
However, if the “paper layer” is removed in the elongated region portion (partial region 33 in FIG. 4) located on the tier tape 30 rather than simply breaking the “paper layer”, The effect of eliminating stiffness is further enhanced.
As a configuration for ensuring this, “1: Adhering the paper layer and the tear tape” or “2: Position of the paper layer in the vicinity of the knobs 31 and 32 protruding from the end of the tear tape 30 is provided. It is conceivable to provide a structure that can be used for partial removal. Examples 1 and 2 in consideration of these will be described below.

FIG. 5 shows the sheet-like lid material of Example 1. Fig.5 (a) has shown the external shape of the sheet-like cover material, FIG.5 (b) has shown the laminated structure in the 5b-5b cross section in Fig.5 (a). The laminated structure was “PET layer / paper layer / tier tape / PE layer / PET layer / seal layer” in order from the front side.
The tear tape 30 was disposed at the position shown in FIG. 5A in the laminated structure. The uppermost PET layer is provided to prevent curling of the lid material during production or to protect printing on the paper layer.

A hot melt layer is laminated on the upper surface of the tear tape 30 and a release varnish layer is laminated on the lower surface to form a three-layer structure, and the tear tape is bonded to the paper layer by the hot melt layer on the upper surface side.
The lid member configured as described above was sealed and fixed to the outer peripheral flange portion of the paper cup. Further, as shown in the cross-sectional view of FIG. 5B, a half cut 40 having a depth from the upper surface of the sheet-like lid material to the middle position of the paper layer was formed. As shown in FIG. 5A, the half cut 40 is formed along the both sides of the tear tape from the knob 32 at a position in the vicinity of the outer peripheral edge of the sheet-like lid member.

Prior to forming the opening for pouring hot water, if the knob 32 is picked and lifted, peeling occurs between the tear tape 30 and the peeling varnish layer, and the tear tape 30 and the paper layer and PET positioned thereon The layer was removed in an elongated region (corresponding to a partial region 33 in FIG. 4) corresponding to the projected area of the tear tape.
After that, when the sheet-like cover material is opened from the opening tab 21 in FIG. 5 (a) to the position where the tear tape was present, the opened portion does not return while being opened, and does not get in the way when pouring hot water, It was easy to reseal after pouring hot water. That is, good shape retention could be achieved both when opening and sealing.

FIG. 6 shows a sheet-like lid material of Example 2. Fig.6 (a) has shown the external shape of the sheet-like lid | cover material, FIG.6 (b) has shown the laminated structure in the 6b-6b cross section in Fig.6 (a).
The outer shape and laminated structure of the sheet-like lid member and the position of the tear tape are the same as those in the first embodiment.
A hot melt layer was provided on the upper surface side of the tear tape to form a two-layer structure, and the tear tape was adhered to the paper layer by this hot melt layer. This lid member was sealed and fixed to the outer peripheral flange portion of the paper cup, and a cut (notch) 50 was formed in the vicinity of the outer peripheral edge of the sheet-like lid member as shown in FIG. The notch 50 penetrates the entire thickness of the sheet-like lid member, and is formed with a length of about 1 mm from the knob portion 32 along both sides of the tear tape toward the inside of the sheet-like lid member. .

  Furthermore, as shown to Fig.6 (a), it was the back surface of the knob | pick part 32, Comprising: The half cut 60 was formed in the position of the cup outer side rather than the opening outer periphery (11) of a cup-shaped container main body. As shown in the cross-sectional view of FIG. 6B, the half cut 60 is formed at a depth from the back surface of the lid material to the front of the tear tape 30 (to the middle of the PE). It extends across the entire width.

Prior to forming the opening for pouring hot water, when the knob 32 is picked and lifted, the tear tape and the paper layer and the PET layer located thereon are elongated regions corresponding to the projected area of the tear tape (FIG. 4). In the middle partial region 33).
After that, when the sheet-like cover material is opened from the opening tab 21 of FIG. 6A to the position where the tear tape was present, the opened portion does not return while being opened, and does not interfere with pouring hot water, It was easy to reseal after pouring hot water. That is, good shape retention could be achieved both when opening and sealing.

  Although main embodiment of this invention was described above, the sheet-like cover material of this invention is not limited to what was illustrated, For example, the following changes can be added.

≪Tear tape 30 formation position≫
As shown in FIG. 2, the position of the tear tape 30 on the sheet-like lid member 20 with respect to the center C of the lid member is the opening tab 21 from the viewpoint of easy pouring of hot water and high shape retention. It is the position on the opposite side and extends substantially orthogonal to the imaginary line connecting the opening tab 21 and the lid material center C (that is, extending substantially orthogonal to the opening direction indicated by the arrow A). Is preferred. Further, the tear tape 30 may extend through the center C of the sheet-shaped lid member so as to be substantially orthogonal to the imaginary line.
As a result, a large spout is secured, and the weight ratio of the lid member located on the opening tab 21 side is larger than the tear tape 30, and the shape retaining property at the time of opening and closing is enhanced due to the influence of gravity. .

≪Laminated structure of sheet-like lid material≫
The laminated structure is not limited to the illustrated example. At least a “paper layer” on which printing is performed and a “sealing layer” for adhesion may be included, and a tear tape may be present on the lower surface side of the “paper layer”. In practice, in addition to these, additional layer configurations are added as appropriate, depending on the type of container contents and other circumstances.

≪Paper layer in laminated structure≫
As the paper layer, those having at least a white surface and suitable for multicolor printing are preferred, and both art paper, piece art paper having a basis weight of about 50 g / m @ 2 to about 120 g / m @ 2, preferably about 75 g / m @ 2 to 100 g / m @ 2 or Double-sided or single-sided coated paper can be suitably used. If this paper layer is too thin, the paper layer itself may be torn when peeled, or if a colored light-shielding layer is provided, for example, it will appear darker from the surface, resulting in inferior commercial value. Invite up. Moreover, in addition to the paper layer, polyethylene terephthalate, stretched nylon, stretched polypropylene, polyethylene terephthalate obtained by ceramic vapor deposition of metal oxides such as aluminum oxide and silicon oxide, and the strength and various barrier properties of stretched polypropylene, etc. are excellent. A resin film can also be laminated.

≪Sealing layer in laminated structure≫
Examples of the sealing layer include polyolefin resins such as linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), high-density polyethylene (HDPE), and unstretched polypropylene (CPP) that are excellent in heat sealability, or ethylene / vinyl acetate. Films of ethylene copolymer resins such as copolymers (EVA), ethylene / acrylic acid copolymers (EAA), ethylene / methacrylic acid copolymers (EMAA) are preferably used, and polystyrene and polybutadiene are used as these polyolefin resins. It is also possible to mix an incompatible component with a polyolefin resin. Further, a hot melt adhesive made of ethylene / vinyl acetate copolymer resin, ethylene / acrylic acid copolymer resin or the like may be provided at a coating amount of about 15 to 25 g / m @ 2, and the container body (10 ) Can be sufficiently sealed with the flange portion (12) and can be peeled open.

The perspective view explaining the conventional cup container. The perspective view which shows the cup-shaped container provided with the sheet-like lid | cover material of this invention. The perspective view which shows the opening state of the cup-shaped container of FIG. 4-4 sectional drawing in FIG. The figure explaining 1st Example. The figure explaining 2nd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cup-shaped container 11 Opening outer periphery 20 Sheet-like lid | cover material 21 Opening tab 30 Tear tapes 31 and 32 Knob part 33 A part area | region of paper layer (part existing on the tear tape 30)
40 half cut 50 cut 60 half cut

Claims (5)

A sheet-like lid member having a tab (21) for opening on the outer peripheral edge and detachably fixed to the outer peripheral edge (11) of the cup-shaped container body (10),
The sheet-like lid material is composed of a laminate including at least a sealing layer and a paper layer for fixing to the outer periphery of the opening (11),
An elongated tear tape (30) is arranged on the lower surface side of the paper layer,
The tear tape (30) is located at a position passing through the center (C) of the sheet-like lid member or at a position opposite to the opening tab (21) with respect to the center (C). Extending substantially perpendicular to the imaginary line connecting (C),
At least one of the both ends (31, 32) of the tear tape (30) protrudes from the outer peripheral edge of the lid member together with the layers positioned above and below the tear tape (30) to form a knob (32). In addition, when the knob portion (32) is picked and peeled, a part (33) of the paper layer located on the tear tape is removed, and the lid material strength in the region is reduced. Sheet-like lid material.   The sheet-like lid material according to claim 1, wherein the tear tape (30) and a paper layer are bonded.   The sheet-like cover material according to claim 2, wherein a release layer is provided on a surface of the tear tape (30) opposite to the adhesive surface to the paper layer.   A half-cut (40) having a depth from the knob portion (32) to the middle position of the paper layer from the upper surface of the lid material along the both sides of the tear tape at a position near the outer peripheral edge of the sheet-like lid material. The sheet-like lid member according to claim 2 or 3, wherein In the vicinity of the outer peripheral edge of the sheet-like lid material, the incision (50) toward the inward of the sheet-like lid material is formed in the lid material along the both sides of the tear tape from the knob portion (32),
A half-cut with a depth from the back surface of the lid material to the front of the tear tape at a position on the back surface of the cup (32) and on the outer side of the cup with respect to the outer periphery of the cup (11). The sheet-like lid material according to claim 2 or 3, wherein 60) is formed over the entire width of the knob portion (32).

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