JP5625436B2 - Lid material - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a container lid used for instant food that is poured into hot water and eaten after draining.

  Conventionally, hot water is poured when eating instant foods such as fried noodles and spaghetti, and used for instant foods that need to be quickly drained from the container after a predetermined time (time to make instant foods edible). As for containers to be used, noodles, utensils, etc. are formed in foamed polystyrene resin (PS) molded containers, polypropylene resin (PP) molded containers, molded containers made of laminated material in which polystyrene resin (PS) sheets and polyethylene terephthalate resin (PET) sheets are laminated. In general, a packaging form in which a sauce, etc. is stored, a plastic molding lid formed with a notch serving as a hot water cut hole is fitted and sealed, and the whole is shrink-wrapped with a shrink film is generally used.

  However, in the case of the packaging form having the above-described configuration, the sealing performance is inferior because a cut serving as a hot water cut hole is formed. Also, since the number of hot water cut holes is limited, it takes time to cut the hot water. Since it is a fitting lid, the lid is removed from the container when the hot water is drained. Or there was a problem that hot water leaked out from the gap between the lid and the container and could cause burns.

Therefore, the upper sheet and the lower sheet have a configuration in which the upper sheet and the lower sheet are partially detachably laminated, and a lid member in which a knob part protruding outward is formed on the outer peripheral edge, the lower sheet faces the knob part. A hot water cut hole is formed in the peripheral portion, and a lower sheet cut is formed so as to partition a region where the knob portion and the hot water cut hole are formed, and a part of the inner surface of the upper sheet is opposed to the hot water cut hole. A lid material with a hot water hole having a structure in which a release layer is formed on the surface has been developed. (For example, see Patent Document 1)
By covering the contents with such a lid material, the container has excellent sealing performance, so that hot water does not leak out, can be quickly drained with a simple operation, and can be steamed for a predetermined time. is there.

  Known documents are shown below.

JP 2000-203653 A

  In the lid material of Patent Document 1, since the lower sheet has a laminated structure of a resin layer such as polyethylene, an aluminum foil layer, and a thermoplastic resin layer of a sealant from the outside, the upper sheet is weak against piercing and pulling. When the hot-water hole is exposed, the lower sheet breaks when triggered by the hot-water hole, and the lower sheet tears when the cover material is peeled and removed after hot-water removal. Etc.

  In order to reinforce this, it is also possible to laminate stretched films such as polyethylene terephthalate or polyethylene, but the opening retainability is lost, and there is a possibility that it closes when pouring hot water.

  The present invention is intended to solve the above-mentioned problems. The object of the present invention is to remove the upper sheet when the upper sheet is peeled off to reveal the hot water cut hole or when the cover material is peeled off after the hot water cut. The object is to provide a lid that does not break.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the invention of claim 1 is a single-sheet instant punched into a predetermined shape having a tab for opening at the outer peripheral edge, which seals the upper end opening of the container body. A lid for a food container, wherein the lid has a separation region that can be separated into an upper sheet and a lower sheet, and a hot water cut- off hole is provided in the lower sheet in the separation region , and at least the separation region The lower sheet is a laminate including a tear prevention resin layer laminated by melt resin extrusion lamination with a T-die, and the tear prevention resin layer is an amorphous polyethylene terephthalate resin layer or ethylene-vinyl alcohol. A lid material characterized by being a copolymer layer.

  By providing a tear-preventing resin layer on the lower sheet as in the above configuration, the lower sheet is prevented from being weakened by the heat of sealing, making it difficult to break, and when the upper sheet is peeled off to reveal a hot water cut hole, The lower sheet is not torn when the cover material is peeled off after cutting.

  In the lid material of the present invention, the lower sheet is not torn when the upper sheet is peeled off to reveal the hot water hole or when the lid material is peeled and removed after the hot water is cut.

  There is no need to use a stretched film in the layer structure, the lid can be softened, and the fingers are not cut at the ends. Moreover, since it is not necessary to purchase a film, it is advantageous in terms of cost and the process is not complicated.

  Furthermore, by eliminating a metal foil layer such as an aluminum foil, inspection with a metal detector and cooking in a microwave oven are possible, and the discardability after use is improved. Moreover, oil resistance and barrier properties can be imparted without using aluminum foil, and the opening retention property of the lid material when pouring hot water and the resealability by returning it are excellent.

It is a top view explaining typically one embodiment of a lid material of the present invention. It is typical sectional drawing showing the fundamental layer structure of one Embodiment of the cover material of this invention. It is a typical sectional view showing layer composition of one embodiment of a lid material of the present invention. It is a typical sectional view showing layer composition of other embodiments of a lid material of the present invention. It is typical sectional drawing showing the layer structure of further another embodiment of the cover material of this invention.

  Hereinafter, modes for carrying out the present invention will be described. FIG. 1 is a plan view schematically illustrating an embodiment of a lid member of the present invention. FIG. 2 is a schematic cross-sectional view showing a basic layer configuration of an embodiment of the lid member of the present invention.

  An embodiment of the lid 1 according to the present invention will be described. In FIG. 1, the lid member 1 is formed by laminating an upper sheet 2 and a lower sheet 3. And the upper sheet 2 and the lower sheet 3 are laminated | stacked so that at least one part can peel. In the drawing, a part of the upper sheet 2 is peeled off on the left side so that the lower sheet 3 can be seen.

The lid 1 is provided with a lid body 4 having a shape covering the opening of the container body, and an opening tab 5 on the outer edge of the lid body 4. The lower sheet 3 is provided with a notch 6 for hot water cut hole inside the outer edge opposite to the opening tab 5.

  Further, the upper sheet 2 is provided with a peeling notch 7 for peeling a part of the upper sheet 2, and a part of the upper sheet 2 is arranged on the outer edge portion on the side of the hot water cut hole 6 from the peeling notch 7 A peeling tab 8 is provided for peeling the sheet, and when the peeling tab 8 is held between the peeling tab 8 of the lower sheet 3 and the lid body 4, the lower sheet 3 is removed from the container body. A peeling tab cut 9 is provided so as not to peel off.

  In this example, a hot water cut hole notch 6 is provided in the lower sheet 3 so that the hot water cut hole is opened when the upper sheet 2 is peeled off. The upper sheet may be laminated using the lower sheet having holes, and the hot water hole may be closed.

  Fig.2 (a) is typical sectional drawing showing the fundamental layer structure of one Embodiment of the cover material 1 of this invention. The lid member 1 is composed of an upper sheet 2 and a lower sheet 3. The upper sheet 2 is provided with a peeling cut 7, and the lower sheet 3 is provided with a hot water cut hole cut 6.

  FIG. 2B is a cross-sectional view showing a state where a part of the upper sheet 2 has been peeled off. The lower sheet 3 is peeled off together with the upper sheet 2, and a hot water cutting hole 10 is opened in the lower sheet 3.

  A more specific layer configuration of one embodiment of the lid 1 of the present invention will be described. As shown in FIG. 3, an upper sheet 2 composed of a pattern printing layer 11, a paper layer 12, a light shielding printing layer 13, and a polyethylene layer 14, and a lower sheet 3 composed of a tear preventing resin layer 15 and a sealant resin layer 16 are laminated from above. Has been. In this layer configuration, peeling is possible at the interface between the polyethylene layer 14 and the tear preventing resin layer 15.

  FIG. 4 is a schematic cross-sectional view showing a layer configuration of another embodiment of the lid member of the present invention. From above, an upper sheet 2 composed of a pattern printing layer 11, a paper layer 12, a light shielding printing layer 13, and a release varnish layer 17, and a lower sheet 3 composed of a polyethylene layer 14, a tear prevention resin layer 15, and a sealant resin layer 16 are laminated. ing. In this layer configuration, peeling is possible at the interface between the peeling varnish layer 17 and the tear preventing resin layer 15.

  FIG. 5 is a schematic cross-sectional view showing a layer configuration of still another embodiment of the lid member of the present invention. From the top, the upper sheet 2 composed of the pattern printing layer 11, the paper layer 12, and the release varnish layer 17, and the lower sheet composed of the polyethylene layer 14, the aluminum foil layer 18, the adhesive layer 19, the tear prevention resin layer 15, and the sealant resin layer 16. 3 are stacked. Even in this layer configuration, the peeling varnish layer 17 and the tear preventing resin layer 15 can be peeled at the interface.

  Each layer of the layer configuration of the lid 1 of the present invention will be described. The tear prevention resin layer 15 is a layer made of an amorphous polyethylene terephthalate resin or an ethylene-vinyl alcohol copolymer, and is laminated by a molten resin extrusion laminating method using a T die.

  Since these resins are not easily stretched as compared with polyolefin resins, they are less likely to bend during peeling and prevent tearing during peeling. Moreover, since barrier property is also high, oil-fat barrier property and odor barrier property can be provided.

Amorphous polyethylene terephthalate resin is a homopolyethylene terephthalate resin obtained by polymerizing terephthalic acid or dimethyl terephthalate and ethylene glycol, or terephthalic acid or dimethyl terephthalate and ethylene glycol. A copolymer synthesized by adding carboxylic acid (dicarboxylic acid) or polyalcohol (diol), and is amorphous.

  Examples of this include A-PET using homo-PET or copolymerized PET with reduced crystallization rate, and PETG with addition of 1,4 cyclohexanedimethanol as the third component.

  On the other hand, an ethylene-vinyl alcohol copolymer is a copolymer of vinyl alcohol and ethylene, and is produced by polymerizing vinyl acetate and ethylene and then substituting acetate groups with hydroxyl groups by saponification.

The paper layer 12, a paper having a basis weight of ^50g / ^{m 2 ~150g} / m 2 is preferably used. When the pattern print layer 11 is provided on the paper surface, it is preferable that at least the surface is white and suitable for multicolor printing, and both art paper, single art paper, or both coated paper on which a base coat layer for printing is laminated. One-sided coated paper can be preferably used.

When the basis weight is less than 50 g / m ² , the rigidity and mechanical strength are slightly insufficient. When the basis weight is more than 150 g / m ² , the rigidity is already sufficient and there is no need for more, and time is required for heat sealing. This is not preferable because there is a decrease in the interlaminar strength of the paper and a decrease in the ease of folding of the paper at the time of opening.

  It is preferable that the grain of the paper layer 12 (longitudinal direction of the fibers of the aligned paper) is in a direction orthogonal to the peeling direction of the opening tab 5. Thereby, when pouring hot water, it is easy to bend | fold along a paper grain, and the folded cover material 1 cannot return easily. In addition, forming a concavo-convex pattern on the surface of the lid member can reduce repulsion due to paper fibers, and can further improve the dead hold property at the time of opening.

  The pattern printing layer 11 is provided with characters, patterns, gloss varnishes, and the like in ink, and the printing method is not particularly limited, such as gravure printing, offset printing, flexographic printing, etc. However, when it is provided by gravure printing, gradation is applied. It is preferable because the pattern can be expressed clearly.

  As the ink, an oily or water-based ink suitable for each printing method is used. In the case of gravure printing, when the substrate is paper, nitrified cotton-based ink is preferable from the viewpoint of heat resistance when the lid 1 is heat sealed to the container body.

  Similarly, the light-shielding printing layer 13 can be formed by a normal gravure printing method or other printing method using an oily or aqueous printing ink.

  It is not necessary to provide the light-shielding printing layer 13 as a single layer, and an ink containing a white pigment is provided on the paper layer 12 side, a white or light-colored first printing layer is provided, and an ink containing a black pigment is superimposed thereon. May be used to provide a second printed layer of colors such as black, gray, brown, orange, sepia. Further, a three-layer or four-layer shading print layer 13 may be used.

  The polyethylene layer 14 is made of low-density polyethylene or linear low-density polyethylene, and this layer is also laminated and provided by melt resin extrusion lamination using a T-die.

The sealant resin layer 16 may be a single layer or multiple layers, but the innermost surface of the sealant resin layer 16 is a low density polyethylene, a linear low density polyethylene, an ethylene-vinyl acetate copolymer resin, an ethylene-methacrylic acid copolymer. It is preferably an easy peel sealant resin layer made of a mixed resin mainly composed of an acid copolymer resin such as a resin or an ethylene-acrylic acid copolymer resin. In any case, the material of these sealant resin layers 16 is selected according to the material on the bonding surface side of at least the peripheral edge of the opening of the adherend container.

  The peeling varnish layer 17 is a layer that is provided on the lower sheet 3 side of the upper sheet 2 so that the upper sheet 2 and the lower sheet 3 can be peeled, and is provided as necessary. In the case of FIG. 3, the polyethylene layer 14 and the tear-preventing resin layer 15 are not fused due to the nature of the resin, and can be peeled off without being used.

  Moreover, the peeling varnish to be used is not particularly limited, and the upper sheet 2 and the lower sheet 3 may be peeled. For example, a release resin varnish mainly composed of a thermoplastic resin such as a urethane resin or a polyamide resin, or a nitrified cotton resin or wax can be used. And it can provide by apply | coating a peeling varnish. Moreover, an undercoat layer or a sealing agent layer can be provided on the surface to which the release varnish is applied.

  At the same time as punching the laminated body of these layer configurations into a predetermined shape, a peeling cut 7 is provided by cutting the upper sheet 2 from the upper sheet 2 side, and the lower sheet 3 is cut from the lower sheet 3 side. By performing the half cut, the hot water cut hole notch 6 and the peeling tab notch 9 are provided, and the single-wafer-shaped lid member 1 is completed.

Specific examples of the present invention will be described below.
<Example 1>
The upper sheet 2 shown in FIG. 3 is composed of a pattern printing layer 11, a paper layer 12, a light shielding printing layer 13, and a polyethylene layer 14, and a lower sheet 3 consisting of a tear prevention resin layer 15 and a sealant resin layer 16. The laminated lid 1 is created.

A piece of art paper (basis weight 104.7 g / m ² ) is used as the paper layer 12, and a pattern printing layer 11 such as letters, patterns, and glossy varnish is printed on the outer surface using a multicolor gravure printing machine, and the back surface is oxidized. White ink with titanium pigment and black ink with carbon black pigment are overprinted in 2 units each using a solid plate with a plate depth of 35 μm, and a light-shielding printing layer with a coating amount of 6 g / m ² (solid content) 13 was provided.

  The surface of the light-shielding print layer 13 of the paper layer 12 provided with the light-shielding print layer 13 is subjected to a corona discharge treatment, and a low-density polyethylene (thickness 15 μm) is extruded and laminated using a T-die type extrusion laminating machine. It was.

  Further, PETG, ionomer, and easy peel sealant resin based on ethylene-methacrylic acid copolymer are coextruded on the surface of the polyethylene layer 14 so that each thickness becomes 10 μm, and the 10 μm tear is prevented. The resin layer 15 and the sealant resin layer 16 having a total thickness of 20 μm were provided, and the lid material original fabric of Example 1 was produced. The ionomer of the sealant resin layer 16 also functions as an adhesive resin between the tear prevention resin layer 15 and the easy peel sealant resin.

The lid stock produced as described above is formed into a substantially circular shape with a diameter of 180 mm with a tab 5 for opening so that the peeling direction is perpendicular to the direction of the paper of the paper layer 12 (length of the aligned fibers). At the same time as punching, an exfoliation cut 7 is provided on the upper sheet 2 side, a hot water cut hole notch 6 and an exfoliation tab cut 9 are provided on the lower sheet 3 side, and a single-wafer-shaped lid 1 is produced. It was set to 1.
<Example 2>
As shown in FIG. 4, the layer structure includes an upper sheet 2 including a pattern printing layer 11, a paper layer 12, a light shielding printing layer 13, and a release varnish layer 17, a polyethylene layer 14, a tear prevention resin layer 15, and a sealant resin layer 16. The cover material 1 formed by laminating the lower sheet 3 is prepared.

Similarly to Example 1, a piece of art paper (basis weight 104.7 g / m ² ) was used as the paper layer 12, the pattern printing layer 11 was printed on the outer surface, and the light-shielding printing layer 13 was provided on the back surface.

  A sealing varnish and a nitrified cotton-based release varnish were applied to the surface of the paper layer 12 of the paper layer 12 provided with the light-shielding print layer 13 to provide a release varnish layer 17. The peeling varnish layer 17 was provided not on the entire surface, but on the part of the region from the peripheral portion including the peeling cut 7, the peeling tab 8 and the hot water cut hole cut 6.

On the surface of the release varnish layer 17, a low-density polyethylene (thickness: 15 μm), A-PET (thickness: 10 μm), ionomer resin (thickness: 10 μm), ethylene-methacrylic acid copolymer system is used. Example 2 A four-layer of an easy peel sealant resin (thickness 10 μm) was coextruded to provide a polyethylene layer 14 having a thickness of 15 μm, a tear preventing resin layer 15 having a thickness of 10 μm, and a sealant resin layer 16 having a total thickness of 20 μm. A raw material for the lid was prepared. In the same manner as in Example 1, the original material for the lid material was punched out to produce a single-wafer type lid material 1, which was designated as Example 2. <Example 3>
As shown in FIG. 5, the upper sheet 2 is composed of a pattern printing layer 11, a paper layer 12, and a release varnish layer 17, a polyethylene layer 14, an aluminum foil layer 18, an adhesive layer 19, a tear preventing resin layer 15, and a sealant. The lid member 1 on which the lower sheet 3 made of the resin layer 16 is laminated is created.

A piece of art paper (basis weight 104.7 g / m ² ) was used as the paper layer 12, and the pattern printing layer 11 was printed on the outer surface thereof. A sealing varnish and a nitrifying cotton-based release varnish 17 were applied to the surface of the paper layer 12 of the paper layer 12 on which the pattern print layer 11 was printed on the outer surface, thereby providing a release varnish layer 17. The peeling varnish layer 17 was provided not on the entire surface, but on the part of the region from the peripheral portion including the peeling cut 7, the peeling tab 8 and the hot water cut hole cut 6.

  An aluminum foil layer made of a soft aluminum foil (thickness 9 μm) is extruded on the surface of the release varnish layer 17 by low-density polyethylene (thickness 15 μm) of the polyethylene layer 14 using a T-die type extrusion laminating machine. 18 were laminated.

  Subsequently, a T-die type extrusion laminating machine is used on the surface of the aluminum foil layer 18 to form an ionomer resin (thickness 5 μm), PETG (thickness 5 μm), ionomer resin (thickness 5 μm), and an ethylene-methacrylic acid copolymer system. Example 4 of co-extrusion of 4 layers of an easy peel sealant resin (thickness 5 μm) to provide an adhesive layer 19 having a thickness of 5 μm, a tear preventing resin layer 15 having a thickness of 5 μm, and a sealant resin layer 16 having a total thickness of 10 μm A raw material for the lid was prepared. In the same manner as in Example 1, this raw material for the lid material was punched out to produce a single-wafer type lid material 1, which was designated as Example 3.

Hereinafter, comparative examples of the present invention will be described.
<Comparative Example 1>
The lid material in which the tear prevention resin layer 15 is provided not on the lower sheet 3 but on the upper sheet 2 is referred to as Comparative Example 1. First, as in Example 1, a piece of art paper (basis weight 104.7 g / m ² ) was used as the paper layer 12, the pattern printing layer 11 was printed on the outer surface, and the light-shielding printing layer 13 was provided on the back surface.

  The light shielding printing layer 13 surface of the paper layer 12 provided with the light shielding printing layer 13 is subjected to corona discharge treatment, and using a T-die type extrusion laminating machine, ionomer resin (thickness 15 μm) and PETG (thickness 10 μm). The laminated structure of the upper sheet 2 was obtained by extrusion lamination by a coextrusion method.

On the PETG surface of the upper sheet 2, low-density polyethylene (thickness 10 μm) and easy-peel sealant resin (thickness 5 μm) of an ethylene-methacrylic acid copolymer system are coextruded using a T-die type extrusion laminating machine. Then, the sealant resin layer 16 was provided, and the lid material original fabric of Comparative Example 1 was produced. This lid material original was punched out in the same manner as in Example 1 to produce a single-wafer type lid material, which was referred to as Comparative Example 1.
<Comparative example 2>
A lid material in which the tear preventing resin layer 15 is not provided on the upper sheet 2 or the lower sheet 3 is referred to as Comparative Example 2. First, a piece of art paper (basis weight 104.7 g / m ² ) was used as the paper layer 12, and the pattern printing layer 11 was printed on the outer surface thereof. Apply a sealing varnish and nitrified cotton-based release varnish 17 to the surface of the paper layer 12 of the paper layer 12 on which the pattern print layer 11 is printed on the outer surface, and provide a release varnish layer 17 to create a laminated structure of the upper sheet 2 did. The peeling varnish layer 17 was provided not on the entire surface but in a region from the peripheral portion including the peeling cut 7, the peeling tab 8, and the hot water cut hole cut 6.

  Low density polyethylene (thickness 15 μm) was extruded on the surface of the release varnish layer 17 using a T-die type extrusion laminating machine, and a soft aluminum foil (thickness 9 μm) was laminated by a sandwich lamination method.

  Subsequently, an ethylene-methacrylic acid copolymer resin (thickness 10 μm) and an ethylene-methacrylic acid copolymer-based easy peel sealant resin (thickness 10 μm) were used on the surface of the soft aluminum foil using a T-die type extrusion laminating machine. These two layers were coextruded to provide a sealant resin layer having a total thickness of 20 μm, and a lid material original fabric of Comparative Example 2 was produced. This lid stock was punched out in the same manner as in Example 1 to produce a single-wafer type lid material, which was referred to as Comparative Example 2.

The lid materials of Examples 1 to 3 and Comparative Examples 1 and 2 prepared as described above were heat-sealed at 130 ° C. × 0.5 sec × 0.3 MPa to the flange portion of the molded polystyrene foam container of the container body. And evaluated.
<Evaluation method>
Holding the opening tab 5, open the lid from the container body to half the opening of the container body, add hot water, return the lid again, steam for 3 minutes, and then hold the peeling tab 8 Then, the upper sheet on the cut side for the hot water cut hole was peeled and removed from the peel cut 7, the hot water cut hole 10 was opened, and the hot water was discarded from the hot water cut hole 10.

  Immediately after the waste hot water, the lid 5 was peeled off from the container body with the opening tab 5. At this time, the lid material that was peeled and removed from the container main body without being torn was evaluated as ◯, and the broken lid material was evaluated as x. The results are shown in Table 1.

＜比較結果＞
上記実施例１から３の本発明の蓋材は、いずれも良好であり、湯切孔を現すために上シートを剥がすとき、あるいは、湯切後に蓋材を剥離除去する時に下シートが破れてしまうことがない。

<Comparison result>
The lid materials of the present invention of Examples 1 to 3 are all good, and the lower sheet is torn when the upper sheet is peeled off to reveal a hot water cut hole or when the cover material is peeled and removed after hot water cutting. There is no end.

  On the other hand, in the lid materials of Comparative Examples 1 and 2, the lower sheet was torn when the lid material was peeled and removed after the hot water was cut.

DESCRIPTION OF SYMBOLS 1 ... Lid material 2 ... Upper sheet 3 ... Lower sheet 4 ... Lid material main body 5 ... Opening tab 6 ... Cut for hot water cut hole 7 ... Peeling cut 8 ... Peeling tab 9 ... Peeling tab cut 10 ... Hot hole 11 ... Picture printing layer 12 ... Paper layer 13 ... Light-shielding printing layer 14 ... Polyethylene layer 15 ...・ Tear prevention resin layer 16... Sealant resin layer 17... Release varnish layer 18... Aluminum foil layer 19.

Claims (1)

A lid for an instant food container punched into a predetermined shape having a tab for opening at the outer peripheral edge that seals the upper end opening of the container body, wherein the lid comprises an upper sheet and a lower sheet A tear- off hole is provided in the lower sheet in the release region , and at least the lower sheet in the release region is laminated by molten resin extrusion lamination using a T-die. A lid material comprising a resin layer, wherein the tear prevention resin layer is an amorphous polyethylene terephthalate resin layer or an ethylene-vinyl alcohol copolymer layer.

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