JP5002143B2 - Lid material - Google Patents

Description

  The present invention relates to a lid member having an easily peelable thermoadhesive resin layer as an innermost layer. More specifically, the present invention relates to a lid material that is excellent in shape retention and can hold a state in which the lid is opened to the planned opening portion.

  Conventionally, after filling a cup-shaped or square-shaped container with the contents, the lid is heat sealed and hermetically packaged. When using, the consumer picks the tab of the lid and pulls it upward. Easy peel containers that can be easily opened are excellent in convenience and design, so various solid or liquid foods such as dessert foods such as yogurt, pudding and jelly, and liquids such as fruit juice, coffee, cocoa and milk drinks Widely used as a beverage container, or a packaging container that also serves as a tableware such as solid foods such as instant noodles and snack foods. In addition, products that consumers cannot eat at once, and instant foods that are prepared by pouring hot water, such as snack foods and instant noodles, can be taken out with the lid partly opened. It is used by pouring hot water, and in order to return the lid to its original state and to close the opening, the lid is easily peeled off and opened to the expected opening line. A function such as dead hold property is required to return the shape to the closed state and keep the shape of the opening closed. In addition, products such as milk potions are required to have a function of maintaining an opened state until the lid material is opened and poured into another container. The combination and configuration of the cup container and the lid material are suitable for filling machines and convenient for customers who consume products at the end in addition to the physical and chemical properties required when the contents are stored and distributed. Has become a consideration. In addition, molded containers such as cup containers that are excellent in maintaining the shape of the contents can prevent moisture, oxygen, light, It is composed of materials that take into account various barrier properties such as flavor.

  Conventionally, in order to obtain the various barrier properties described above, a structure in which an aluminum foil is laminated on a container and its lid material has been often used. In addition, the reason why aluminum foil is often used is to prevent the curling of the lid material in addition to the barrier property, and to provide a function of dead hold property that can maintain the shape of the opened state and the closed state. The basic configuration was, for example, a laminate composed of a paper base material, an aluminum foil, and a heat bonding resin layer. However, in a package sealed with a lid containing an aluminum foil, it is not possible to use a metal detector for detecting metal pieces mistakenly mixed in the container during the process of filling the contents. There was a point. In addition, aluminum foil is not only difficult to separate and collect, but also has an environmental problem in that it is difficult to dispose of aluminum foil because of the relatively large amount of ash even if it is incinerated with the cover material. Recently, the configuration not using aluminum foil is increasing. Furthermore, a lid member having a configuration excluding an aluminum foil has also been proposed for applications requiring dead hold properties (see, for example, Patent Document 1).

However, the cover material as proposed in Patent Document 1 does not have a sufficient shape-retaining function for applications where shape retention is required. For example, for the use of instant noodles, up to the scheduled opening line for the tab portion. Open the lid material, pour hot water while holding the lid material by hand so that the lid material does not return to the original, and then return the lid material to its original position and keep the opening closed. There is an annoyance such as putting a weight on the top and cooking.
JP 2000-118546 A

  Therefore, the present invention attaches a shape-holding member to the cover made of a laminate, imparts a dead hold property, can hold the shape when opened to the expected opening line for the tab portion, and returns the cover to the original position. It is to provide a lid member provided with a function capable of closing the opening.

The present invention has been made to achieve the above object, and the present invention according to claim 1 is a separate body from a laminate having an easily peelable thermoadhesive resin layer in the innermost layer and the laminate . In the lid member comprising a shape holding member and provided with a tab portion extending outward from the outer periphery, at least the planned opening line with respect to the tab portion is a rolling ratio of 5 to 16 times, a draw ratio of 1.3 to 2.5 times, and is characterized in that said shape retaining member made of a smaller swath than said laminate comprising a total draw ratio of 10 to 40 times the stretched polyolefin resin is attached.

  Since the shape holding member is attached to the planned opening line for the tab portion of the lid material of the present invention, when the tab portion of the lid material is picked by hand, peeled off from the container, and opened to the planned opening line, the lid material It is possible to maintain the shape of the opened state without returning to the original state, and to return the original state and maintain the shape of the opening part closed, and the lid is opened when the lid material is opened and closed. There is no need to hold the material by hand or place weights, and it is possible to provide convenience to consumers.

  Furthermore, the lid material of the present invention can use a metal detector during the process of filling the contents by constituting each layer of the laminate with a non-metallic material, and can prevent mixing of metal pieces. The effect is obtained.

  The above-described present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a lid according to the present invention. FIG. 2 is an explanatory view showing a state in which the lid material of FIG. 1 is opened to the expected opening line. FIG. 3 is an explanatory view showing a state in which the opening portion is closed by returning the lid member of FIG. FIG. 4 is a perspective view showing another embodiment of the lid member according to the present invention. FIG. 5 is an explanatory view showing a state where the lid material of FIG. 4 is opened to the expected opening line of another embodiment.

  First, an embodiment of a lid according to the present invention will be described with reference to FIGS. 1, 2, and 3. As shown in FIG. 1, the lid 1 is composed of a laminate having an easily peelable thermoadhesive resin layer in at least the innermost layer, provided with a tab portion 2 extending outward from the outer periphery, and provided on the surface. A band-shaped shape holding member 4 formed of a thermoplastic resin is bonded and configured so as to straddle the scheduled opening line 3. The lid 1 is heat-bonded at the flange 6 by superimposing the innermost heat-adhesive resin layer surface of the laminate constituting the lid 1 on the flange 6 provided at the upper opening edge of the cup-shaped container 5. Has been.

  The container 5 is formed by vacuum forming a laminated material obtained by laminating a plastic film, a sheet obtained by co-extrusion of, for example, polypropylene or an ethylene vinyl alcohol copolymer, a sheet made of a single substance or a blended material such as polypropylene, polyethylene terephthalate, and polystyrene, and a foam sheet. , Formed into a cup shape by pressure forming, vacuum pressure forming, press forming. Alternatively, a resin such as polystyrene or polypropylene is formed into a cup shape by injection molding, or a resin such as expanded polystyrene or expanded polypropylene is injection molded to form a cup-shaped heat insulating container. Or the laminated body containing a paper layer is shape | molded in the cup shape with the paper cup molding machine. The shape holding member 4 is composed of a strip-shaped material made of a stretched polyolefin resin having a rolling ratio of 5 to 16 times, a stretching ratio of 1.3 to 2.5 times, and a total stretching ratio of 10 to 40 times. It is thermally bonded. As a bonding method, a method using an adhesive such as thermal bonding or hot melt is used. For food use, a bonding method by thermal bonding is preferred. The bonding surface may be either the front surface or the back surface of the lid 1 and may be arbitrarily selected depending on the application. Further, depending on the purpose, the part to be bonded may be provided in a part where the shape is desired to be maintained. Alternatively, it can be provided in a strip shape on the entire surface of the planned opening line 3. It is preferable to select the optimum shape holding member 4 size and bonding position in relation to the waist of the material constituting the lid member 1 and to provide it to the minimum. Moreover, the shape holding member 4 can also be partially provided in the tab part 2, and the state which returned and closed the lid | cover material 1 can also be made more exact | strict.

  Next, a laminate of the lid material 1 will be described. The laminate used for the lid 1 according to the present invention has a chemical protection function (gas barrier property, moisture permeability, etc.) and physical protection function (tensile strength, impact strength, heat seal strength, etc.) required for the contents. ) In consideration of the surface layer / intermediate layer / thermoadhesive resin layer. Furthermore, because the performance required for the laminate changes depending on the suitability of the filling and packaging machine for the contents of the lid 1 (for example, whether the lid is a take-up supply method or a single wafer supply method), the configuration of the laminate also changes. For example, as a typical configuration example in the case of the single wafer supply method, the following configuration can be given. Note that any lamination method such as dry lamination, wet lamination, and extrusion lamination can be used, and the display is omitted.

(1) Paper / EP
(2) Paper / VMPET / EP
(3) Paper / PET / EP
(4) Paper / AL / EP
(5) PET / paper / EP
(6) PET / paper / VMPET / EP
(7) PET / paper / PET / EP
(8) PET / Paper / AL / EP
(9) PET / EP
(10) PET / VMPET / EP
(11) PET / ON / EP
(12) OPP / PET / EP
(13) OPP / VMPET / EP
(14) PET / AL / EP
(15) PET / AL / PET / EP
However, the present invention is not limited to these, and various films can be used in combination as a laminate depending on the required performance. The abbreviations used in the description of the configuration examples are as follows. EP: Easily peelable thermal adhesive resin film, VMPET: biaxially stretched polyester film deposited with silica, alumina or aluminum, PET: biaxially stretched polyester film, AL: aluminum foil, ON: biaxially stretched nylon film, OPP: two An axially stretched polypropylene film is shown. In addition, EP shows the easily peelable thermobonding resin layer of the innermost layer which comprises the cover material 1, and the easy peeling mechanism changes the mixing ratio of the vinyl acetate of ethylene-vinyl acetate copolymer resin, for example, the flange of the container 5 The adhesive strength between the support layer and the thermal adhesive layer is lowered with an interfacial peeling type that peels at the interface between the part 6 and the thermal adhesive resin layer, and a film in which the support layer and the thermal adhesive layer are coextruded in two or three layers. In addition, when opening by thermally bonding to the flange portion 6 of the container 5, a delamination type, random polypropylene, polyethylene, polystyrene, etc., which are to be peeled off from the support layer of the heat bonding resin layer and the heat bonding layer, are predetermined. The mechanism is roughly classified into three mechanisms of the cohesive peeling type mixed at a ratio, but all of them are included. Furthermore, a hot melt type can also be used for the easily peelable thermoadhesive resin layer.

  In the above configuration example, when the shape holding member 4 is attached to the lid material 1 so as to straddle the planned opening line 3, a shape holding effect is obtained. Although shape retention is difficult, a significant shape retention effect can be obtained by attaching the shape retention member 4, and a metal detector can be used during the content filling process to prevent metal fragments from being mixed. In addition, it is easy to dispose of after incineration. Moreover, in the laminated body containing the aluminum foil shown in the configuration examples (4), (8), (14), and (15), there is a larger shape retention effect, and the thickness of the aluminum foil can be reduced. Therefore, it is effective for cost reduction and convenience at the time of disposal.

  Next, a method of using the lid 1 according to the present invention will be described with reference to FIGS. As shown in FIG. 2, a consumer who has purchased a cup-filled product filled with contents in a container 5 and sealed with a lid 1 picks the tab portion 2 by hand and opens the lid 1 while pulling it upward. When opening to the expected opening line 3, the shape holding member 4 attached so as to straddle the expected opening line 3 is folded, and the shape holding member 4 holds the lid material 1 in an opened state. Can be easily taken out. Further, as shown in FIG. 3, when the lid member 1 is returned to the original position and the opening is to be closed, the tab portion 2 is manually picked and returned to the original shape, and the shape holding member bent by the rigidity of the lid member 1 is used. 4 is held in an extended state, and the lid 1 is held in a flat state, so that the opening can be held in a closed state. Such usage can be suitably used as a lid for cooking instant noodles or a lid for temporarily storing snack foods that could not be eaten.

  Next, another embodiment will be described with reference to FIG. As shown in FIG. 4, the rectangular lid member 21 is formed of a laminate having an easily peelable thermoadhesive resin layer in at least the innermost layer, and an unbonded portion with a part of the notched flange portion 26 is formed at one corner. A tab portion 22 is formed, and a scheduled opening line 23 is provided on a substantially diagonal line with respect to the tab portion 22, and the surface of the lid member 21 extends along the planned opening line 23 across the planned opening line 23. In addition, a band-shaped shape holding member 24 formed of a thermoplastic resin is bonded to the structure. The lid member 21 is bonded to the flange portion 26 provided at the upper opening edge of the rectangular parallelepiped container 25 with the innermost heat-adhesive resin layer surface of the laminate constituting the lid member 21 and thermally bonded by the flange portion 26. Has been. Others are the same as those of the embodiment of the present invention, and the description is omitted.

  Next, a method of using the lid member 21 according to the present invention will be described with reference to FIG. As shown in FIG. 5, a consumer who has purchased a product in a molded container filled with contents in a container 25 and sealed with a lid 21 picks the tab portion 22 by hand and opens the lid 21 while pulling upward. Then, when opening to the planned opening line 23, the shape holding member 24 attached so as to straddle the planned opening line 23 is bent, and the shape holding member 24 holds the lid material 21 in an opened state. Things can be taken out easily. Further, when the lid member 21 is returned to the original position and the opening portion is to be closed, the tab portion 22 is picked by hand and the shape holding member 24 bent by the rigidity of the lid member 21 is extended. Since the lid 21 is held in a flat state, the opening can be held in a closed state. When the lid 21 is thus opened and a large opening is formed, it is preferable that the belt-like shape holding member 24 is attached long along the planned opening line 23. Alternatively, a plurality of parts may be attached short and partially. Such usage can be suitably used as a cover material for temporary storage of snack food with a large capacity.

Next, the lid according to the present invention will be described with reference to examples.
Dry lamination of single-side coated paper (basis weight 79.1 g / m2) and aluminum oxide vapor-deposited surface of a 12 μm thick biaxially stretched polyethylene terephthalate film with aluminum oxide vapor-deposited on one side using an adhesive made of urethane resin Laminated. Furthermore, while providing an anchor agent layer made of an isocyanate resin on the biaxially stretched polyethylene terephthalate film surface, low-density polyethylene was hot melt extruded 20 μm thick, and a 20 μm thick easily peelable thermoadhesive resin (Mitsui / Dupont Poly). A laminate was produced by extrusion lamination of Chemical Co., Ltd. (trade name CMPS). Thereafter, the laminate was defeated and punched to produce a blank of the lid material 1. Furthermore, the shape holding member (made by Sekisui Chemical Co., Ltd., product name Forte) having a thickness of 0.3 mm is set to have a size of 5 mm × 20 mm so as to straddle the scheduled opening line 3 provided on the single side coated paper surface, and the longitudinal direction is parallel to the opening direction. A lid member 1 having an outer diameter of 110 mm having a tab portion 2 was prepared by bonding with a hot melt adhesive. Thereafter, the flange portion 6 of the foamed polystyrene container having an opening outer diameter of 105 mm formed by injection molding and the heat bonding resin surface of the lid member 1 were overlapped and thermally bonded to prepare a sample container.

  The same laminate as in Example 1 was deceased and punched to produce a rectangular lid 21 blank. Further, the shape holding member (product name: Forte, manufactured by Sekisui Chemical Co., Ltd.) having a thickness of 0.3 mm is formed in a strip shape of 5 mm × 100 mm so as to straddle the scheduled opening line 23 provided on the single side coated paper surface, and the longitudinal direction is the planned opening line A rectangular lid member 21 having a size of 100 mm × 150 mm was produced by bonding with a hot melt adhesive so as to be parallel to the plate 23. Thereafter, a 0.6 mm thick polypropylene / ethylene vinyl alcohol copolymer / polypropylene co-pressed sheet was vacuum-formed and formed into a substantially rectangular parallelepiped shape having a flange portion 26 having an outer dimension of 100 mm × 150 mm × depth of 50 mm. The heat bonding resin surfaces of the flange portion 26 and the lid member 21 were overlapped and thermally bonded, a notch-shaped unbonded portion was formed at one corner, and a tab portion 22 was provided to prepare a sample container.

  About the sample of the lid | cover material produced above, the state which opened the lid | cover material and the closed state were evaluated. Both the lid materials of Example 1 and Example 2 were able to hold the state in which the lid material was opened and the state in which the lid material was closed, and good results were obtained, and the shape retention effect was sufficient.

It is a perspective view which shows one Embodiment of the cover material concerning this invention. It is explanatory drawing which shows the state which opened the lid | cover material of FIG. 1 to the scheduled opening line. It is explanatory drawing which shows the state which returned the cover material of FIG. 2 and closed the opening part. It is a perspective view which shows other embodiment of the cover material concerning this invention. It is explanatory drawing which shows the state opened to the opening planned line of other embodiment of the cover material of FIG.

Explanation of symbols

1,21 Lid material 2,22 Tab part 3,23 Scheduled opening line 4,24 Shape holding member 5,25 Container 6,26 Flange part

Claims (1)

In the lid material in which the laminated body having an easily peelable thermoadhesive resin layer in the innermost layer and the laminated body are formed of a separate shape-holding member and provided with a tab portion extending outward from the outer periphery, at least the tab The unscheduled line with respect to the part was composed of a strip-like material smaller than the above laminate comprising a stretched polyolefin resin having a rolling ratio of 5 to 16 times, a stretching ratio of 1.3 to 2.5 times, and a total stretching ratio of 10 to 40 times. lid, characterized in that said shape retaining member is attached.

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