JP2000185769A - Lid body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely seal the flange part of a vessel main body by a lid body, and solve a variation problem in separation strength between the lid body and the flange part of the vessel main body by forming an opening along the inside of an outer periphery of the lid body, and also forming the opening in an openable manner. SOLUTION: A lid body 1 to be sealed to the vessel main body opening 3 of a vessel main body 2 is formed with an opening inside thereof by opening cut lines A along its outer periphery. Also, the lid body 1 comprises a base material layer 5, barrier layer 6, and an adhesive layer 7; then, provided at the inside of the opening cut lines A made at the base material layer 5 are a tongue-like tap strip 8 containing a part of the open cut lines A and a depressed hole 9 at a part of the outer periphery of the tab strip 8, so that the tab strip 8 is picked readily by the depressed hole 9. The base material layer 5 and barrier layer 6 are adhered; however, the part of the tab strip 8 is adhered with the barrier layer 6 by applying a separation varnish at a position of the tab part in the rear surface of the base layer 5 in advance, thereby rendering the tab strip 8 separable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid having a sealing property and an easy opening property, which is used as an inner lid or a sealing lid of a plastic cup, a paper cup, a glass container or the like.

[0002]

2. Description of the Related Art Conventionally, a sealing lid has been widely known as a lid after filling contents such as food into a container body such as a paper cup or a plastic cup. In many of these seal lids, the lid is peeled off from the flange portion of the container body by pulling a knob piece provided on the lid with a finger, and the lid is opened, but sufficient sealing performance is obtained. At present, it is difficult to remove the lid because the sealing strength is increased. In the prior art, the easy-opening property is generally adjusted by adjusting the strength of the seal between the flange portion and the lid of the container body to be large or small. Heat is applied to melt and bond the respective interfaces of the container body and the lid. Naturally, the same material completely melts and cannot be opened. Therefore, the material of the sealing surface of the lid is modified to be in a pseudo-fused state to facilitate opening.
However, the bonding of different materials increases the variation in sealing strength, and in an actual manufacturing process, the sealing strength tends to increase because the sealing conditions to be set are increased in consideration of the sealing performance. In order to solve this problem, various materials (sealants) are used for the sealing surface of the lid body corresponding to various materials of the container body.

[0003]

However, in the case of a lid which has been widely used, it is necessary to adjust the sealing strength by using various materials as described above, and the adjustment is difficult. Moreover, after the lid was peeled off, a part of the adhesive layer of the lid remained on the flange portion of the container, which had a problem in appearance or use, and could not be said to have a sufficient function.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is not to use an opening method in which a lid is peeled off at a flange portion of a container body, but to apply a method along an outer edge of the lid. Forming an opening on the inside, and opening the opening, and by using a knob piece provided inside the opening as a starting point, the opening can be easily torn open. The initial peel strength at the time of opening is small, the lid can completely seal the flange of the container body, and there is no problem of the variation in peel strength between the lid and the flange of the container body. It is an object of the present invention to provide a lid without a partial remaining of the lid at a flange portion.

[0005]

The above objects can be attained by the present invention described below.

[0006] That is, the invention according to claim 1 is a lid, comprising a base material layer, a barrier layer, and an adhesive layer, which seals an upper end opening of a bottomed cylindrical container body, In the base material layer, an opening is formed by an opening cut line inside along the outer edge of the lid, and a tongue-shaped knob piece including a part of the opening cut line is formed inside the opening, and the opening is formed. A lid is formed so that a portion can be opened along the circumference, a release varnish is applied to the back surface of the knob, and the base layer and the barrier layer are bonded to each other. .

According to the present invention, an opening is formed along the inside of the outer edge of the lid, and the opening is opened, instead of the opening method in which the lid is peeled off at the flange of the container. The lid can completely seal the flange of the container main body, and there is no problem of variation in peel strength between the lid and the flange of the container main body, such as partial remaining of the lid at the flange of the container main body. Can be obtained without any problem. Also, by applying a release varnish to the back surface of the knob piece, the knob piece is easily peeled off, and the base layer is cut along the opening cut line by starting to peel off the knob piece of the base layer. Simultaneously with the tearing, the barrier layer and the adhesive layer can also open the tear opening.

According to a second aspect of the present invention, in the first aspect of the present invention, a hole is provided in the base material layer along at least a part of an outer periphery of the knob. And

According to the present invention, it is easy to pick a knob piece which is to be opened for opening the opening provided in the base material layer.

According to a third aspect of the present invention, in the first or second aspect of the present invention, an end portion of the knob is formed with a pressing rule and provided so as to be on the center line of the lid. It is characterized by the following.

[0011] According to the present invention, when the tab is picked and the peeling at the peeling varnish portion is completed, the tab is bent by the pressing rule, and then the base is cut along the opening cut line. At the same time that the opening of the material portion is torn, the force for tearing the barrier layer and the adhesive layer is easily applied.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the opening cut line is provided by a Y-shaped cut line.

According to the present invention, by making the opening cut line a Y-shaped cut line, the opening portion is continuously torn along the circumference without interruption.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a lid according to the present invention. As shown in FIG. 1, the lid 1 is sealed in a container body opening 3 at the upper end of a container body 2. Further, an opening 4 is formed by an opening cut line A inside along the outer edge of the lid 1.

Examples of the container body 2 include a paper cup, a plastic cup, and a glass bottle. In the case of a paper cup, a material having a thermoplastic resin layer such as a polyethylene resin on the innermost surface is used, a top curl portion is provided at the upper end, and the lid 1 is sealed at the top curl portion. In the case of a plastic cup, it can be made of a single-layer or multilayer plastic sheet. An arbitrary resin material is used. For example, various simple resins such as polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polycarbonate, polyvinyl chloride, and polyamide, or a mixture of several kinds of these resins can be used.

The lid 1 is hermetically sealed in the opening at the upper end of the container main body 2. As shown in FIG. 2, the structure is such that a base layer 5, a barrier layer 6, an adhesive layer 7 are formed. Consists of As a form of the lid 1, as shown in FIG. 3, only the base material layer 5 has a circular opening cut line A inward along the outer edge of the lid 1.
The opening 4 of the cover 1 is opened by the opening cut line A. The opening cut line A is a perforation, a half cut, a Y-shaped cut line, and the like, and the Y-shaped cut line is particularly preferable because it easily opens the opening 4 along the circumference.

Further, a tongue-shaped knob 8 including a part of the cut line A is provided inside the cut line A provided in the base material layer 1. First, the gripping piece 8 of the base material layer 1 is gripped, and the cut line A of the opening is cut along the circumference, so that the barrier layer 3 and the adhesive layer 7 are cut off at the same time, and the opening 4 of the lid 1 is opened. can do. The shape of the knob piece 8 provided on the base material layer 1 is not particularly limited to a tongue shape, and may be any shape such as a trapezoid that can be gripped by a finger.

In the base material layer 1, the knob pieces 8
A hole 9 is provided in at least a part of the outer periphery of. By providing the holes 9, the knob 8 can be easily gripped. The shape of the hole 9 is a three-month shape along the tongue of the knob 8. When the shape of the knob 8 is not tongue-shaped, the hole 9 is also shaped to match the knob 8.

Further, it is preferable that the end line 10 of the knob piece 8 is formed by a press rule and provided on a center line passing through the center of the lid 1. By this end line 10, the picked piece 8 picked
Is bent, and in a state where the knob 8 is bent, not only the base layer 5 but also the barrier layer 6 and the adhesive layer 7 are torn at the same time by pulling up the bent knob 8. It will be easier.

The lid 1 is hermetically sealed in the opening at the upper end of the container main body 2 described above. The lid 1 is composed of a base layer 5, a barrier layer 6, and an adhesive layer 7; And the barrier layer 6 are adhered, but only the knob piece 8 is detachably adhered.

As the material of the base material layer 5, a paperboard excellent in printability, tensile strength and the like is mainly used. In addition, a plastic film having tensile strength, a thin metal plate such as aluminum, or a composite material thereof can be used.

The barrier layer 6 is mainly made of a plastic film. As this plastic film,
For example, polyvinyl chloride film, polyvinylidene chloride film, polyethylene film, polypropylene film, polyvinyl alcohol film, polyethylene terephthalate film, polycarbonate film,
Examples include a nylon film, a polystyrene film, an ethylene-vinyl acetate copolymer film, an ethylene-vinyl alcohol copolymer film, and an ionomer. In addition, a metal foil such as aluminum can be used, and a composite material of these can also be used. The barrier layer 6 is preferably made of a material having a low tear strength so that the barrier layer 6 can be easily opened along the opening cut line A.

The adhesive layer 7 is provided on the innermost layer of the barrier layer 6 so as to be thermally bonded to the container body opening 3 of the container body 2. When the barrier layer 6 is sealed with the container main body 2, it is necessary that the adhesive layer 7 be strongly bonded by heat and pressure of the sealer. In addition, since it comes into direct contact with the contents, physical properties against the contents are required. Such an adhesive layer 7 includes an ethylene-vinyl acetate copolymer or a modified product thereof,
There are various resins such as polypropylene, polyethylene, and polystyrene, which can be appropriately selected from various conditions such as content resistance and seal strength.

When the adhesive layer 7 is laminated, the adhesive layer 7 can be laminated by extrusion coating the inner surface of the barrier layer 6 or the inner surface of a material in which the base material layer 5 and the barrier layer 6 are laminated.

The adhesive layer 7 may be formed by using a material having a barrier property, which is a function of the barrier layer 6, so that the adhesive layer 7 also serves as the barrier layer 6. Also, the barrier layer 6
Since it is necessary that the adhesive layer 7 and the adhesive layer 7 can be easily torn and opened, the thickness including the barrier layer 6 and the adhesive layer 7 is preferably in the range of 15 to 50 μm. Examples of the combination of the barrier layer 6 and the adhesive layer 7 include aluminum / polyethylene and cellophane / polyethylene.

The base layer 5 and the barrier layer 6 are adhered to each other, but the knob 8 can be peeled off. The portion provided with releasability is the entire knob piece 8. Actually, it is possible to apply a release varnish to the position of the knob on the back surface of the base layer 5 in advance, and to adhere this to the barrier layer 6 and then to peel off the knob 8.

Further, about 3 mm inside and outside the opening cut line A.
In the area (shaded area in FIG. 2), it is preferable to further increase the adhesive strength between the base material layer 5 and the barrier layer 6 in order to make it difficult to cause delamination and to facilitate opening by tearing. For this purpose, it is preferable to perform heat sealing on this portion again to increase the adhesive strength.

Hereinafter, a method for manufacturing the lid 1 of the present invention will be described.

First, as shown in FIG. 4A, a picture, a display, and the like are printed on the surface of a material such as a sheet-like or rolled-up paperboard which becomes the base layer 5. Known inks used for general packaging materials can be used for inks such as pictures.

On the other hand, as shown in FIG.
A release varnish is printed so as to be located on the back surface of the knob piece 8 to be processed in the next punching step. As the release varnish, for example, nitrified cotton polyamide resin, silicone resin, polyethylene wax, paraffin wax, etc.
Alternatively, an ink obtained by adding a silicone resin or polyethylene wax to a conventional offset ink, gravure ink, or screen ink can be used.

Next, as shown in FIG. 4C, an opening cut line A, a hole 9 and an end line 10 are simultaneously provided in a punching step. This punching step can be performed by using a single-sheet punching machine in the case of a single wafer, or by using a rotary die cutter in the case of a single wafer. The opening cut line A is a perforated line, a half cut line, a Y-shaped cut line, or the like, and is preferably a Y-shaped cut line so as to be easily torn continuously along the circumference.

Subsequently, the base layer 5, the barrier layer 6, and the adhesive layer 7 are bonded by extrusion coating (extrusion coating) or lamination.

Subsequently, the material of the cover material in which the barrier layer 6 and the adhesive layer 7 are laminated on the base material layer 5 is punched again in the outer shape in the punching step, whereby the cover 1 can be manufactured. In these manufacturing steps, it is necessary to match the positions of printing on the front surface of the base material layer 5, printing of the release varnish on the back surface, punching of the opening cut line A and the like, and finishing of the outer shape of the lid.

Hereinafter, opening of the lid 1 of the present invention will be described.

As shown in FIG. 5, the knob 8 of the cover 1 is picked. At this time, the punch 8 is provided to facilitate the knob 8 to be picked. Next, as shown in FIG.
Pulling the knob piece 8 off the barrier layer 6,
Since a release varnish is applied to the back surface of the knob piece 8, the knob piece 8 can be easily peeled off. And
When reaching the end line 10 which is the end point of the knob piece 8, resistance occurs. Further, as shown in FIG. 5B, by twisting the knob piece 8 with a finger, the opening line A of the base layer 5 is torn, and at the same time, the barrier layer 6 is cut.
The adhesive layer 7 is also torn, so that the opening 4 of the lid 1 can be opened.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the lid according to the present invention will be described below.

Example 1 First, a pattern, a display, and the like were printed on the surface of a sheet-like paperboard (cardboard 160 g / m ² ) serving as a base material layer by offset printing. A general offset ink was used as the ink for the picture and the like.

Next, a release varnish (trade name: UV Carton Release OP varnish (manufactured by Inktechl Co., Ltd.) )) Was printed.
As the release varnish, a UV-curable ink having releasability was used.

Next, in the punching step, an opening cut line, a punched hole, and a pressing rule were simultaneously formed. This opening cut line is Y
It was shaped like a letter.

Subsequently, 7 μm of aluminum serving as a barrier layer and 30 μm of polyethylene serving as an adhesive layer were added to the base material layer.
m (aluminum 7 μm / polyethylene 30 μm) was bonded by lamination via an adhesive layer.

Subsequently, the material of the lid material on which the base material layer, the barrier layer, and the adhesive layer were laminated was subjected to finish punching of the outer shape again in the punching step, thereby producing a lid body.

Example 2 First, a rolled film (polyethylene terephthalate 12 μm) serving as a base material layer 5 was prepared.
m) On the back side, print a pattern, display, etc. by gravure printing,
Further, the release varnish was also printed in the same step so as to be located at the knob portion processed in the next punching step. The ink used for the picture and the like was an ink used for a general packaging material, and the release varnish was a varnish made of a silicone resin.

Next, an opening cut line and a pressing rule were simultaneously formed by a rotary die cutter. This opening line is
A Y-shaped cut line is provided to facilitate continuous tearing along the circumference.

Next, a polyethylene resin 3
Extrusion coat (extrusion coat) 0μm
Then, a layer serving as both a barrier layer and an adhesive layer was provided.

Subsequently, using the material of the roll-up lid material in which the base material layer and the barrier layer are laminated, in the content filling line, the lid is attached to the container body filled with the content, and the pitch of the pattern is changed. After heat sealing together, the outer shape of the lid was cut off to produce a container body in which the lid was heat-sealed.

[0046]

According to the present invention, the initial peel strength at the time of opening is small, and the container can be completely sealed instead of the opening method in which the lid is peeled off at the flange of the container. There is no problem of variation, and there is no problem such as partial remaining of the lid at the flange portion.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a lid according to the present invention.

FIG. 2 is a view showing a material configuration of a lid according to the present invention.

FIG. 3 is a plan view of a lid and a container body according to the present invention.

FIG. 4 is a diagram illustrating a manufacturing process of a lid according to the present invention.

FIG. 5 is a perspective view showing a state in which the lid according to the present invention is opened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid 2 Container main body 3 Container main body opening part 4 Opening part 5 Base material layer 6 Barrier layer 7 Adhesive layer 8 Knob piece 9 Drilling hole 10 End line A Opening cut line

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Hioki 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Katsuaki Kobayashi 1-chome, Ichigaya-cho, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd. F term (reference) 3E067 AA03 AA11 AB01 BA07A BB01A BB08A BB14A BC03A BC07A CA07 EA06 EB02 EB11 FA01 FC01 GD10 3E093 AA06 BB16 CC02 DD10 EE20

Claims (4)

[Claims] 1. A lid comprising a base material layer, a barrier layer, and an adhesive layer for sealing an upper end opening of a bottomed cylindrical container body, wherein the base material layer includes the lid An opening is formed by an opening cut line inside along the outer edge of the opening, and a tongue-shaped knob that includes a part of the opening cut line is opened inside the opening, and the opening is opened along the circumference. A lid formed by applying a release varnish to the back surface of the knob piece and bonding the base layer and the barrier layer together. 2. The lid according to claim 1, wherein a hole is provided in the base material layer along at least a part of an outer periphery of the knob piece. 3. The lid according to claim 1, wherein an end portion of the knob piece is formed by a press rule so as to be located on a center line of the lid. 4. The lid according to claim 1, wherein the opening cut line is provided by a Y-shaped cut line.