JP2001048220A - Cup lid material having re-sealability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the cup lid material capable of certainly re-sealing a once opened lid material during heat-cooking due to hot water in spite of laminated constitution free from an aluminum foil. SOLUTION: In a lid material 10 hermetically sealing a cup container main body 6 heat-sealed to the upper surface of the flange 4 provided in the opening edge of the cup container main body 6, a slit piece 3 formed by a slit line 2 expanding toward the flange 4 is provided in the almost central part of the knob piece 1 of the lid material 10 protruded outward from the flange 4 and the leading end part of the slit piece 3 is engaged with a part of the undersurface of the flange 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid material for a cup container for ready-to-eat foods to be cooked by pouring boiling water.

[0002]

2. Description of the Related Art Insulation containers, which have been used mainly for instant noodles, generally have an aluminum foil as an intermediate layer. After pouring hot water, the lid is resealed. To make use of the plastic deformability of aluminum foil,
It was relatively easy to return to the state before opening. However, in recent years, as with general packaging materials, the use of aluminum foil, which has a high environmental impact, which causes high costs, has been required for the lid material, and a switch to paper-based materials has been required. In the case of the lid material, the plastic deformability is lost, and it is heated from the inside by the steam from the hot water and curling is likely to occur. It is extremely difficult to return to the position before opening (providing resealability).
Therefore, several ideas and inventions relating to the resealability of the cup lid material without aluminum foil have been made so far, and two examples thereof will be described below. FIG. 4 is an explanatory view of a lid material having resealability of a conventional hot water cooking cup container without aluminum foil. In Japanese Patent Application Laid-Open No. 7-17554, FIG.
As shown in (a), a crescent-shaped flap F defined by an outermost edge 11, a curved cut line 12, and two fold lines 13 formed at a knob portion of the cup lid member 30 is lowered downward when resealing. A cup cover material 30 having a resealability in which the inner edge of the flap F formed by the curved cut line 12 is locked to the outer edge 14 of the flange 15 so that the position can be fixed at the time of reseal is proposed. Have been. In Japanese Patent Application Laid-Open No. 10-316168, FIG.
As shown in (b), in addition to the knob 21, two folding pieces 22 are projected at opposing positions on both sides of the knob 21, and the knob 21 and the two folding pieces 22 are resealed when resealing. There has been proposed a cup lid member 40 which is bent downward to be tightly held on an edge portion (flange) of a cup container body to enable resealing.

[0003]

SUMMARY OF THE INVENTION However, Japanese Unexamined Patent Publication No.
The cover material 30 proposed in Japanese Patent No. 17554 is excellent in terms of function, but it requires structurally increasing the size of the entire knob piece, so that the cover material area becomes large and the use of rigid paper is required. Therefore, there is a problem that the cost of the lid material cannot be significantly reduced even if the laminated structure of the lid material is simplified. In addition, there is a problem that the protruding knob piece becomes an obstacle in distribution. JP-A-10-31
The lid material 40 proposed in Japanese Patent No. 6168 employs a locking means for folding the central knob piece 21 and the two folded pieces 22 downward to closely hold the edge (flange). There is a functional problem in that it is poorly reliable to lock the lid member 40 only at such an edge portion, particularly at the outer edge of the curved lip portion formed by curling in the case of a paper cup. The present invention has been made in view of this problem, and does not use aluminum foil, and uses a material having a simple laminated structure of only paper and a sealant layer.
It is an object of the present invention to provide a lid material that can be used in the same area as a lid material using a conventional aluminum foil and that can be reliably resealed regardless of the shape of the flange.

[0004]

The resealable cup lid material according to the present invention, which has been made to achieve the above object, comprises:
A lid member that is heat-sealed to an upper surface of a flange provided on an opening edge of the cup container body to seal the cup container body, and a knob of the lid material projecting outward from an outer edge of the flange. A cut piece formed by a cut line bulging toward the flange side is provided substantially at the center, and the tip of the cut piece is located at a position where it is engaged with a part of the lower surface of the flange. .

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is a diagram showing a state before opening a resealable cup lid material according to the present invention. FIG. 1A is a plan view, and FIG. 1B is a cross-sectional view taken along the line AA ′ in FIG. Cup lid material 1 having resealability according to the present invention
0 (hereinafter simply referred to as cup container 2).
0) is composed of the resealable cup lid material 10 and the cup container body 6 according to the present invention, and the cup container 20 is the resealable cup lid material 10 according to the present invention. It is formed by heat sealing over the entire periphery of the upper surface of the flange 4 of the cup container body 6. As shown in FIG. 1A, the cup lid material 10 having resealability according to the present invention has a knob that protrudes outside the outer edge of the flange 4 (indicated by a dotted line outside the double junction line). A cut piece 3 formed by a cut line 2 bulging toward the flange 4 side is provided substantially in the center of the piece 1. Then, the tip of the flange enters inside the outer edge of the flange 4. That is, in a plan view, the cut piece 3
And the portion near the outer edge of the flange 4 is superposed.
The cut piece 3 has an arc-shaped edge, but the shape is not limited to an arc but may be an ellipse, a U-shape, or a U-shape. Cup container body 6 to which heat-sealed cup lid 10 having resealability according to the present invention is applied.
In FIG. 1, the opening has a circular shape as shown in FIG. 1 (a), and a flange 4 which curls outward is formed around the opening as shown in FIG. 1 (b). I have. However, this shape is one mode, and the planar shape of the opening does not necessarily have to be circular, and even if it is elliptical,
It may be in the shape of a corner with a radius at the corner. FIG.
The cross-sectional shape of the flange 4 shown in (b) may be a shape formed by curling once and flattened. Further, the material of the cup container body 6 is
The paper cup need not be a paper cup as shown in FIG. 1, but may be a foamed plastic container or a plastic molded container obtained by general vacuum / pressure molding, injection molding or the like.

FIG. 2 is an explanatory view of a procedure for resealing a cup lid material having resealability according to the present invention, and FIG. It is a perspective view. As shown in FIG. 2, the cup container 20 in which the opening of the cup body 6 is heat-sealed by the resealable cup lid material 10 according to the present invention is shrunk in a state where the knob 1 is bent downward. It is commercially available with the film 5 overlapped. To open the cup container 20, first, as shown in FIG.
Remove the shrink film and remove the cover 1 from the tab 1
A part of 0 is peeled upward and opened, and hot water is poured from the opened opening. In order to prevent the lid 10 from returning to its original state and closing the opening during the injection of the hot water, as shown in FIG. If the lid 10 is pushed downward with a finger or a pointed object under the flange 4 at a position opposite to the position where the lid 10 is first peeled off, the lid 10 can be fixed in an open state. Next, as shown in FIG. 2, when the lid member 10 is returned to the horizontal position, the lid 10 is again opened due to the curl or the curl at the time of opening and the curling caused by heating from the inside. The notch 3 formed at the center is pushed downward (in the direction of the arrow) with a fingertip or a pointed object so that the tip of the notch 3 comes under the flange 4 as shown in FIG. If the front end of the cut piece 3 is locked by a part of the lower surface of the flange 4, the lid 10 can be fixed and the resealed state can be maintained. This condition is also illustrated by FIG. As described above, it is possible to easily push the cutting piece 3 so that the front end thereof is located below the flange 4 with almost no resistance. The above-described locking means is realized by planarly overlapping the front end portion of the notch piece 3 and the flange 4 by utilizing the force of the knob 1 side of the lid member 10 trying to lift upward. ing. The locking force in this case depends on the rigidity of the paper used for the lid 10, but if the paper has a basis weight described later, the lid 10 once resealed tends to lift upward. This is superior to the force, and the lid member 10 can be securely fixed as shown in FIG. 2 and can maintain the resealed state. With the lid 10 in this state, the cup container 20 is left and cooked for a predetermined time, and then the lid 10 is entirely removed or the cup main body 6 is opened in an appropriate area.
You can take out the contents and eat it.

[0007] A cup lid material 1 having resealability according to the present invention.
0 is a piece art with a basis weight of 60 to 120 g / m ² , high quality paper,
A roll paper made of kraft paper or the like is printed on the surface by gravure printing or the like, and a sealant layer made of a polyolefin resin having a low-temperature sealability and having a thickness of 25 to 50 μm is provided on the back surface. As a method of providing the sealant layer, any known method such as extrusion coating or lamination of a sealant film may be used. The degree of freedom of printing on the surface of the cup lid material 10 having resealability according to the present invention is high, and offset,
Not only known printing such as gravure and flexo, but also post-printing processing such as various overcoating, foil pressing and embossing can be freely performed. The cup lid material 10 having resealability according to the present invention is printed and processed in the state of a multi-layered rolled paper, and is finally punched out into individual sizes for use. At the time of this punching, the above-mentioned score lines 2 are formed simultaneously. In addition, when the opening of the cup container body 6 is circular, the knob 1 protrudes as shown in FIG. However, since they are accommodated in a rectangle circumscribing the outside of the opening, multi-face mounting without waste is possible, and material loss can be minimized. The outer diameter of the opening of the cup container body 6 to which the lid member 10 according to the present invention is applied is 70 to 150 mm, and the inner volume is in the range of 600 to 1500 cc when fully filled. Also,
The three-dimensional shape of the cup container body 6 does not need to be limited to a so-called cup shape, and may be a bowl shape or a bowl shape with an opening diameter larger than the height.

In general, when hot water comes into contact with a plastic surface or a plastic layer on the inner surface of a food container, sufficient consideration must be given to monomers remaining in the plastic, heavy metals used in the polymerization catalyst, and the like. Elution of other additives and the like is likely to occur, which is a problem of food contamination. In this case, it is natural that the amount of these eluted does not exceed the reference value defined by the Food Sanitation Law.
Environmental hormones (exogenous) have been pointed out that there is a risk of disturbing the endocrine secretion of organisms, such as bisphenol A eluted from polycarbonate resin, which is widely used in baby bottles and tableware for school meals, and styrene oligomers eluted from expanded polystyrene containers. The use of resins that elute sexual endocrine disrupters) should be avoided on the precautionary principle. In the cup lid material 10 having resealability according to the present invention, since a resin with no further addition is selected and used from among the polyolefin resins having a small risk, the innermost surface of the heat insulating container is provided with a sense of security. Can be used.

[0009]

According to the cup lid material having resealability according to the present invention, the notch piece 3 provided on the gripping piece 1 is engaged with the flange 4 while having a laminated structure which is easy to curl without aluminum foil. By stopping, the lid material once opened can be securely fixed during cooking with hot water, and the resealed state can be maintained. In addition, the laminated structure is a simple one in which the aluminum foil is eliminated and a sealant layer is provided on the paper layer, and the outer shape of the lid material can be housed in a shape that is not wasted in multi-face mounting, so that the manufacturing cost is reduced. It is economical because it can be suppressed. In addition, there is no need to separate them for disposal, and they can be recycled.
It is possible to supply packaging materials with a low environmental load.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state before opening a cup lid material having resealability according to the present invention.

FIG. 2 is an explanatory view of a resealing procedure of a cup lid material having a resealing property according to the present invention.

FIG. 3 is a perspective view showing a locked state of a cup lid material having resealability according to the present invention.

FIG. 4 is an explanatory view of a lid material having resealability of a conventional hot water cooking cup container without aluminum foil.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 knob piece 2 cut line 3 cut piece 4 flange 5 shrink film 6 cup container body 10 cup lid material having resealability according to the present invention 20 cup container 30 conventional cup lid material 40 conventional cup lid material

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E067 AA19 AB01 BA02A BA07A BB01A BB14A BC03A BC07A CA07 CA17 CA24 EA06 EA32 EB01 EB17 EB19 EE02 FA01 FC01 GD02 3E084 AA02 AA12 AA24 AA34 AB10 BA01 BA07 CC08 FD13 GA06 GB06 GB08 GB12 HA01 HB01 HC08 HD01 JA19 KA14 KA15

Claims (1)

[Claims] 1. A lid member which is heat-sealed to an upper surface of a flange provided at an opening edge of a cup container body to seal the cup container body, wherein the lid member projects outside an outer edge of the flange. A cut piece formed by a cut line swelling toward the flange side is provided substantially at the center of the knob piece, and the tip of the cut piece is located at a position where it engages with a part of the lower surface of the flange. Cup lid material having resealability.