JP5025937B2 - 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 retaining property, can hold a state where the lid is opened to the expected opening line, and can close the opening by returning the lid material to its original state.

  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. The combination and material composition of the cup container and the lid material are convenient for the filling machine and the physical and chemical properties required when the contents are stored and distributed, so that customers who consume the product at the end can easily handle it. It has become a consideration for sex. 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 a dead hold property that can maintain the shape of the opened state and the closed state, and the container, particularly the lid material. The basic configuration of was a laminate composed of, for example, 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 made of a shape holding member and provided with a tab portion extending outward from the outer periphery, at least the tab portion has a rolling ratio of 5 to 16 times, a draw ratio of 1.3 to 2.5 times, and a total draw ratio of 10 The shape holding member made of a single band-like material smaller than the laminate made of a stretched polyolefin resin of 40 times is attached, and the shape holding member is scheduled to be opened from the tab portion to the tab portion It reaches the position that crosses the line .

  Since the shape retaining member is attached to the tab portion of the lid material of the present invention, the tab portion of the lid material is picked by hand, peeled off from the container, opened to more than 1/2 of the opening portion, and provided on the tab portion. The opened shape can be held by folding the hooked shape-retaining member on the flange of the container facing the tab, and then the hooked tab is removed from the flange of the container and returned to its original state. The shape-retaining member is bent and hooked on the flange portion of the container at the original position, so that the shape can be maintained in a state where the opening portion is closed.

  Furthermore, the lid material of the present invention has an effect that the opening can be stably held in a state where the opening is opened and a state where the opening is closed again by attaching the shape holding member to the opening planned line with respect to the tab portion.

  Further, by configuring each layer of the laminate with a non-metallic material, a metal detector can be used during the process of filling the contents, and an effect that mixing of metal pieces can be prevented 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 where the lid member of FIG. 1 is opened and closed. FIG. 3 is a perspective view showing another embodiment of the lid according to the present invention. FIG. 4 is an explanatory view showing an opened state and a closed state of the lid member of FIG.

  First, an embodiment of a lid according to the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the lid member 1 is formed of a laminate having an easily peelable thermoadhesive resin layer in at least the innermost layer, and is provided with a tab portion 2 extending outward from the outer periphery. The tab-shaped shape holding member 3 formed of a thermoplastic resin is bonded to the tab portion 2. The tab portion 2 is opposed to the tab portion 2 and is separated from the tab portion 2 by a distance of ½ or more of the opening diameter of the container. An opening scheduled line 4 is provided orthogonal to the opening direction from. 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 3 is composed of a strip-shaped material made of a stretched polyolefin resin having a rolling ratio of 5 to 16 times, a stretch ratio of 1.3 to 2.5 times, and a total stretch 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.

  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 of the laminate changes depending on the suitability of 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 3 is attached to the tab portion 2 of the lid member 1, a shape holding effect is obtained, and in particular, a laminate having a configuration that does not include an aluminum foil has poor dead hold property and is difficult to hold the shape. However, by attaching the shape-retaining member 3, a remarkable shape-retaining effect can be obtained, and the lid material having such a structure can be used with a metal detector during the filling process of the contents to prevent the mixing of metal pieces and after use. Can be easily disposed of by incineration. Moreover, in the laminated body containing the aluminum foil shown in the configuration examples (4), (8), (14), and (15), there is an even greater 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 FIG. 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 the container opening is opened more than ½, the shape holding member 3 is brought into contact with the flange portion 6 of the container 5 facing the tab portion 2 and bent so that the shape is held and the tab portion 2 is caught by the flange portion 6 and opened. Can be maintained. Further, when it is desired to close the opening with the lid member 1, the shape retaining member 3 of the tab portion 2 hooked on the flange portion 6 is removed from the flange portion 6, the lid member 1 is returned to the original state, and the opening portion is closed. The closed state can be held by the shape holding member 3 by abutting and bending the tab portion 2 at the original position of the flange portion with which the tab portion 2 is in contact. Such usage is suitable for instant noodle cooking and temporary storage of snack foods that could not be eaten.

  Next, another embodiment will be described with reference to FIG. As shown in FIG. 3, the lid member 21 is made 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 further facing the tab portion 2. A planned opening line 4 is provided at a position away from the tab part 2 by a half or more of the opening diameter of the container perpendicular to the opening direction from the tab part 2, and the lid member 21 is opened from the tab part 2 on the surface. A band-shaped shape holding member 23 formed of a thermoplastic resin is bonded to the position that crosses the planned line 4. The lid member 21 is bonded to the flange portion 6 provided on the upper opening edge of the cup-shaped container 5 with the innermost heat-adhesive resin layer surface of the laminate constituting the lid member 21 and is thermally bonded by the flange portion 6. 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. 4, a consumer who has purchased a cup-filled product filled with the contents of the container 5 and sealed with the lid 21 picks the tab portion 2 by hand and opens the lid 21 while pulling it upward. Open to the position of line 4. Since the shape holding member 23 is formed so as to straddle the planned opening line 4, the shape of the lid member 21 is held in a state where the lid member 21 is opened without returning to the original shape. Further, when the lid member 21 is to be closed, the tab portion 2 of the lid member 21 is picked, the lid member 21 is returned to the original position, the opening portion is closed, and the flange portion where the tab portion 2 is in contact is returned to the original position. By closing and bending the tab portion 2, the closed state can be held by the shape holding member 23.

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). After that, the laminated body was defeated and punched, and the shape holding member (product name Forte, manufactured by Sekisui Chemical Co., Ltd.) with a thickness of 0.4 mm was further formed on the tab portion 2 of the single-sided coated paper with a length of 5 mm × 10 mm. 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 so that the direction was the opening direction. 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.

  Using the same laminate as in Example 1, a lid member 21 was produced. The shape holding member was 5 mm × 70 mm in size, and was bonded so as to straddle the opening planned line 4 from the tab portion 2. Others were produced in the same manner as in Example 1.

  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 where the lid material was opened and the state where 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 cover material of FIG. 1, and the closed state. It is a perspective view which shows other embodiment of the cover material concerning this invention. It is explanatory drawing which shows the opened state and closed state of the cover material of FIG.

Explanation of symbols

1, 21 Lid material 2 Tab part 3, 23 Shape holding member 4 Opening planned line 5 Container 6 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 part composed of a single band-like material smaller than the above laminate comprising a stretched polyolefin resin having a rolling ratio of 5 to 16 times, a draw ratio of 1.3 to 2.5 times, and a total draw ratio of 10 to 40 times A shape-holding member is attached, and the shape-holding member reaches a position straddling a scheduled opening line from the tab portion to the tab portion .

Images