JP4348998B2 - Lid material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lid for a container, and particularly relates to a lid that does not include an aluminum foil in a laminated material constituting the lid.
[0002]
[Prior art]
In the food packaging field, as a molded container B for storing products such as instant noodles that can be eaten with hot water in particular, as shown in FIG. 3, it is cup-shaped or bowl-shaped, mainly polyethylene on paper. Molded container made of laminated material laminated with resin (PE) with extruder, polystyrene resin (PS) molded container, polypropylene resin (PP) molded container, polystyrene resin (PS) sheet and polyethylene terephthalate resin (PET) sheet were laminated Molded containers made of laminated materials are used.
[0003]
Packaging noodles and utensils such as instant noodles are stored in the molded container B, the opening of the container B is covered with a lid A, and the flange portion 7 of the container is sealed by a heat seal method or the like and sealed. The method is taken.
[0004]
Conventionally, various types of lid materials A have been developed and proposed, but in the laminated material constituting the lid material A, there are many laminated materials including aluminum foil.
[0005]
For example, as shown in FIG. 4, the conventional lid A is provided with a pattern printing ink layer 10 on the upper surface of a base material 11 mainly composed of a paper layer, and similarly, a thermoplastic resin layer 12 and an aluminum foil layer on the lower surface of the base material 11. 13 and an easy peel sealant layer 14 are sequentially laminated to form a laminated material.
[0006]
In general, the base material 11 is a bleached kraft paper, pure white roll paper, fine paper, art paper, coated paper manufactured from pulp in which cellulose is extracted by chemically or mechanically treating plant materials such as wood. Etc. are used.
[0007]
The thermoplastic resin layer 12 is produced by extruding a low density polyethylene resin (LDPE) with an extruder, laminating it on a substrate 11 mainly composed of a paper layer, and cooling and solidifying it.
[0008]
The aluminum foil layer 13 is made of an aluminum foil having a thickness of 7 μm or more. However, the aluminum foil layer 13 is excellent in moisture proofing, gas barrier properties, fragrance retention, and light shielding properties, and also has good dead hold properties (molding retention properties). Many are used.
[0009]
The easy peel sealant layer 14 is a hot melt obtained by blending a wax and a tackifier such as rosin or terpene resin to an ethylene-vinyl acetate copolymer (EVA), or a polyolefin such as polypropylene resin (PP) or polyethylene resin (PE). It is formed of a mixed resin obtained by blending polystyrene resin (PS) with a system resin.
[0010]
As described above, since the conventional lid A is made of a laminated material containing an aluminum foil, the lid A is excellent in physical properties such as gas barrier properties and has good dead hold properties. After peeling from the flange part 7, it has the characteristic which can be resealed in the opening part of this container B again.
[0011]
That is, when a consumer eats instant ramen contained in a cup-shaped or bowl-shaped molded container B, first, a part of the lid A is peeled from the container B, and the liquid soup is opened from the opening. After taking out the bag containing the element and the tool, the hot water is poured, and the lid member A peeled off again can be resealed in the opening of the container B.
[0012]
However, in the case of the cover material A made of a laminated material obtained by laminating aluminum foil, if the incineration process is performed in the disposal after use, the aluminum foil remains as a residue and damages the incinerator. There is a fear and a disposal problem will occur.
[0013]
Further, in recent years, it has been requested from the request for resource reuse that the cover material A is collected after use, separated by material, and reused. However, in the laminated material using the aluminum foil as described above, It is extremely difficult to separate and collect materials such as aluminum foil and resin film, and it is practically impossible to reuse them.
[0014]
Furthermore, it is impossible to use a metal detector for confirming the contamination of foreign substances such as metals, which is performed from the viewpoint of hygiene and safety after food packaging, and the hygiene and safety aspects are not good.
[0015]
In order to solve these problems, a combination of various synthetic resins has been studied as a laminated material in which the cover material A does not include an aluminum foil.
[0016]
For example, as shown in FIG. 5, a picture printing ink layer 10 is provided on the upper surface of a base material 11 mainly composed of a paper layer, and an easy peel sealant layer 14 is similarly laminated on the lower surface of the base material 11, that is, simply an aluminum foil layer. The lid material A made of a laminated material containing no metal does not have a disposal problem, which is a problem of the conventional lid material A, and a metal detector can be used, thereby improving hygiene safety.
[0017]
However, by simply removing the aluminum foil layer, paper tearing occurs in the paper layer portion in the laminated material of the lid material A when the lid material A is peeled off from the container B, which was not found in the conventional lid material A. To do.
[0018]
The easy peel sealant layer 14 is inferior in gas barrier properties and further has no oil resistance. Therefore, in the case of a food containing oil such as instant ramen, the oil penetrates the easy peel sealant layer 14 to form a base material. This causes a problem that the printing ink layer 10 on the surface of the paper layer 11 is dissolved and the pattern printed with colorful colors is contaminated and the value of the product is lost.
[0019]
Furthermore, since the easy peel sealant layer 14 is laminated on the lower surface of the base material 11, that is, the cover material A simply made of a laminated material that does not include the aluminum foil layer has no dead-holding property, The problem that it is not good and inconvenience arises.
[0020]
As described above, a laminated material that simply removes the aluminum foil from the laminated material containing the conventional aluminum foil is inferior in physical properties such as gas barrier property and oil resistance, has no dead hold property, and has a product such as instant ramen. Container B to be stored, for example, a molded container made of a laminated material in which polyethylene resin (PE) is laminated on an extruder, a polystyrene resin (PS) molded container, a polypropylene resin (PP) molded container, a polystyrene resin (PS) sheet and polyethylene terephthalate At present, it cannot be used as a cover material A such as a molded container B made of a laminated material obtained by laminating a resin (PET) sheet.
[0021]
[Problems to be solved by the invention]
The present invention solves the problems of the related art, and even with a laminated cover material that does not use aluminum foil, it has excellent physical properties such as gas barrier properties, good dead hold properties and easy opening properties, and further disposal problems It is another object of the present invention to provide a cover material that can be used with a metal detector and has good hygiene safety.
[0022]
[Means for Solving the Problems]
The present invention has been made to solve the above-described problems, and the invention according to claim 1 of the present invention is that a flange portion 7 of a molded container B is provided with a seal portion having substantially the same shape as the flange portion 7. The lid material A for the molded container B to be sealed Paper layer Based on For base material 2 Light-shielding coating layer 3, Made of Na-based ionomer resin Reinforcement layer 4, It is formed from a mixed resin in which a thermoplastic resin is used as a base resin and an incompatible or partially compatible thermoplastic resin is blended with the base resin. Easy peel sealant layer 5 in sequence Formed by lamination, and The light-shielding coating From layer 3 Of the substrate 2 Up to the middle class The lid material is characterized in that it reaches the half-cut line 6 and imparts a dead hold property.
[0023]
The invention according to claim 2 of the present invention is the base resin. Are low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), high density polyethylene resin (HDPE), polypropylene resin (PP), ethylene-propylene copolymer (EP), ethylene-α olefin copolymer, Ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methacrylic acid ester copolymer, ethylene-acrylic acid ester copolymer, ionomer resin, ethylene-vinyl acetate copolymer (EVA) A single resin or a mixture of these resins. It is a cover material of description.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Next, the embodiment of the lid A according to the present invention will be described in detail with reference to FIGS.
[0028]
FIG. 1 is a cross-sectional side view taken along the line XX of FIG. 2 showing a laminated material of the lid A according to the present invention, FIG. 2 is a plan view of the lid A according to the present invention, and FIG. 1 is a perspective view in which a lid A according to the present invention is sealed in a molded container B. FIG.
[0029]
As shown in FIG. 1, the laminated material of the lid A according to the present invention has a pattern printing ink layer 1 provided on the upper surface of a base material 2 mainly composed of a paper layer, and also has a light shielding property on the lower surface of the base material 2. It is formed from a laminated material obtained by sequentially laminating the coating layer 3, the reinforcing layer 4, and the easy peel sealant layer 5. Lid material From the lower surface of the light-shielding coating layer 3 over the entire surface at equal intervals from side to side to the periphery of A Light-shielding coating layer 3 through Base material A half-cut line 6 reaching the intermediate layer 2 is applied to give dead hold property.
[0030]
The base material 2 has various properties required for the lid material A, such as protection (mechanical strength such as tensile strength and burst strength), workability (packaging machine suitability, etc.), and merchantability (printability, etc.). As long as economic (price, etc.), safety and hygiene (non-toxic, easy disposal, etc.) are satisfied, there is no restriction on the type of paper.
[0031]
For example, bleached kraft paper, pure white roll paper, art paper, coated paper, etc. produced from pulp from a plant material such as wood made from cellulose by a chemical method can be used. Coated paper is preferably used.
[0032]
Base material The thickness of 2 is appropriately determined depending on the mechanical strength (tensile strength, burst strength, impact strength, etc.), packaging workability, machine adaptability, economic efficiency, etc., but the basis weight is 40 g / m @ 2 to 270 g / m. It is desirable to use one having an m2 level, preferably one having a basis weight in the range of 50 g / m @ 2 to 130 g / m @ 2.
[0033]
Base material 2. A beautiful pattern printing ink layer 1 is provided on the upper surface for the purpose of improving the sales promotion effect of the product, and a light-shielding printing ink layer 3 is also provided on the lower surface of the substrate 2 in order to impart light-shielding properties.
[0034]
Pattern printing ink layer As the printing ink that forms 1, the coloring material consisting of pigments and dyes that give color to the ink and Color material A resin that adheres to the substrate while dispersing and holding resin Dissolves stably, Pigment A vehicle composed of a solvent that retains the dispersibility of dyes and dyes, the fluidity of the ink, and can transfer the appropriate amount of ink from the printing plate, and further improves the dispersibility of the coloring material, improves the color development, prevents precipitation, and flows For the purpose of improving the property, the pigment is formed from an auxiliary agent such as a surfactant. In particular, the colorant is preferably a pigment having good weather resistance.
[0035]
Pattern printing ink layer 1 is the printing method Base material If it is a printing method that can print on 2, there is no particular limitation, but the base is formed by applying copper plating on the surface of the iron cylinder (cylinder), Copper plating Provide a release layer on the surface, further copper plating, create a recess (cell) by engraving method or corrosion method on the copper surface polished to a mirror surface, cell The printing ink inside Base material The gravure printing method is preferable because it can be transferred to 2 and printed in a colorful manner, and has a high appealing effect.
[0036]
next, Light-shielding coating layer As a material for forming 3, a known printing ink or coating agent can be used.
[0037]
Printing ink For example, it is preferable to use a known gravure printing ink made of a black or blackish brown pigment to block external light such as visible light and prevent oxidation of the contents.
[0038]
The printing method is preferably a gravure printing method as in the case where the pattern printing ink layer 1 is provided, but the printing plate can be a solid plate and the light-shielding coating layer 3 can be provided with printing ink.
[0039]
As the coating agent, a thermoplastic solvent-type resin dissolved in an organic solvent such as toluene, ethyl acetate, methyl ethyl ketone, and alcohol can be used to adjust the fluidity, and an appropriate amount of plasticizer, lubricant, etc. is added as an auxiliary agent, Furthermore, it is preferable to add a coating film reinforcing agent, an antifoaming agent, a leveling agent, a stabilizer and the like as additives.
[0040]
In that case, in order to improve the light-shielding effect, a pigment which is a coloring material may be blended and used.
[0041]
Examples of the thermoplastic solvent-type resin include vinyl chloride / vinyl acetate copolymer resin, acrylic resin, chlorinated rubber resin, polyamide resin, and nitrocellulose resin. These resins may be used alone or in combination.
[0042]
Coating agent As for the coating method, known direct gravure coating method, bottom reverse coating method, kiss roll coating method, squeeze roll coating method, offset gravure coating method, etc. Although it can be used, a direct gravure coating method is preferred.
[0043]
next, Lid material From the lower surface of the light-shielding coating layer 3 over the entire surface at equal intervals from side to side to the periphery of A Light-shielding coating layer 3 through Base material A half-cut line 6 reaching the intermediate layer 2 is applied to impart dead hold property.
[0044]
Half-cut wire 6 is, for example, a thick veneer plywood, or a cutting device using a laser beam to cut a synthetic resin plate into a predetermined shape or a thread saw, and a cutting blade or a ruled line blade is incorporated in the groove, You may use the punching type | mold of the flat plate which consists of a male type which affixed sponge rubber on those both sides, or may use a rotary die cutter.
[0045]
Further, the half cut line 6 may be a cut perforation line provided by using a sewing machine blade instead of the cutting edge.
[0046]
Thus, by applying the half-cut line 6 to the base material 2 made of a paper layer, the same dead hold property as that of the aluminum foil can be imparted to the cover material A.
[0047]
next, container When part of the lid A is peeled off from B, Lid material In order to prevent tearing in the paper layer part of A, Lid material A reinforcing layer 4 is provided to impart oil resistance to A.
[0048]
Reinforcement layer 4 is not particularly limited as long as it is an oil-resistant thermoplastic synthetic resin, but it is preferable to use a Na ionomer resin having good oil resistance, pinhole resistance, and high tear strength.
[0049]
Na ionomer resin Is a resin in which intermolecular molecules of ethylene-methacrylic acid copolymer are cross-linked with Na ions, which are metal ions. It is very tough, has moderate elasticity and flexibility, and has cold resistance, wear resistance, and oil resistance. It has excellent resistance to stress cracking, good compatibility with pigments and fillers, and has stable thermal adhesion to metals and the like because it has a carboxylic acid group.
[0050]
Reinforcement layer 4 is formed by heating the Na-based ionomer resin, melting it in a cylinder called a cylinder, extruding it by applying pressure with a screw, cylinder There is a part with a thin slit (less than 1mm) called T dice at the tip of the tip, and it was dissolved in a curtain shape from the slit Ionomer resin Extrude Base material 2 Laminate on the surface of the light-shielding coating layer 3 on the lower surface.
[0051]
Also, Ionomer resin If you add pigments and other colorants to Reinforcement layer 4 is Light-shielding coating layer It is also possible to fulfill the light shielding property, which is the third role.
[0052]
Also, Reinforcement layer The thickness of 4 is container When part of the lid A is peeled off from B, Lid material In order to prevent tearing in the paper layer part of A, Lid material In order to impart oil resistance to A, a thickness of about 10 μm to 60 μm, preferably about 40 μm is most desirable.
[0053]
Furthermore, Reinforcement layer 4 and Light-shielding coating layer If necessary, the surface of the light-shielding coating layer 3 is subjected to a pretreatment such as ozone treatment or corona treatment, and then coated with an anchor coating agent or the like.
[0054]
Examples of the anchor coat agent include isocyanate-based (urethane-based), polyethyleneimine-based, polybutadiene-based, and organic titanium-based anchor coat agents, or polyurethane-based, polyacrylic-based, polyester-based, epoxy-based, and polyvinyl acetate-based. Adhesives for laminating such as cellulose and others can be used.
[0055]
Anchor coating agent A known gravure roll coating method, bar coating method, dropping method, reverse roll coating method, or the like can be used as a method for coating the film.
[0056]
Next, an easy peel sealant layer 5 is laminated on the reinforcing layer 4 for heat sealing for sealing the opening of the container B, and a laminated material for the lid material A is produced.
[0057]
The easy peel sealant layer 5 needs to be able to be easily opened when the lid A is opened at the same time as strongly adhering to the end face of the flange portion 7 of the container B which is an adherend.
[0058]
In order to satisfy such requirements, various functions are imparted to the cover material A. One of them is the design of an easy-opening mechanism, and examples thereof include an interface peeling mechanism, an interlayer peeling mechanism, and a cohesive peeling mechanism. Is mentioned.
[0059]
Among these, the cohesive peeling mechanism is designed by blending a base resin made of a thermoplastic resin with an incompatible or partially compatible thermoplastic resin, and the release principle is that of an incompatible or partially compatible heat. Utilizing the fact that the plastic resin blend layer has a small cohesive force, at the time of opening, it is not the interface between the sealant layer 5 which is the innermost layer of the cover material A and the adherend, but such an incompatible or partially compatible system. The use of cohesive failure of the blend layer can be mentioned.
[0060]
From the above, the resin forming the easy peel sealant layer 5 uses a mixed resin in which a thermoplastic resin is used as a base resin, and an incompatible or partially compatible thermoplastic resin is polymer blended with the base resin.
[0061]
For example, as the base resin, various resins can be used according to the material of the seal end face of the flange portion 7 of the container B. For example, low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE) , High density polyethylene resin (HDPE), polypropylene resin (PP), ethylene-propylene copolymer (EP), ethylene-α olefin copolymer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer A polymer (EMAA), an ethylene-methacrylic acid ester copolymer, an ethylene-acrylic acid ester copolymer, an ionomer resin, an ethylene-vinyl acetate copolymer (EVA), or the like can be used.
[0062]
Further, as these resins, the above resin alone or a resin mixed with the above resin may be used.
[0063]
Further, in the resin, low molecular weight petroleum resin such as aliphatic petroleum resin, aromatic petroleum resin, copolymer petroleum resin, alicyclic petroleum resin, rosin, polymerized rosin, hydrogenated rosin, rosin glycerin. An appropriate amount may be added to the above resin using rosins such as esters and hydrogenated products or polymers thereof, rosin pentaerythritol and hydrogenated products or polymers thereof as tackifiers.
[0064]
next, Base resin As the blending thermoplastic resin to be blended in, a resin that is incompatible or partially compatible with the base resin is used.
[0065]
Base resin Depending on the type, for example, low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), high density polyethylene resin (HDPE), polypropylene resin (PP), polybutene resin (PB), ethylene-propylene copolymer (EP), ethylene-α olefin copolymer, polyethylene terephthalate resin (PET), polyamide resin (Ny), acids such as ethylene-acrylic acid copolymer (EAA) and ethylene-methacrylic acid copolymer (EMAA) Copolymers, esterified products such as ethylene / methyl acrylate copolymer (EMA), ethylene / ethyl acrylate copolymer (EEA), ethylene / methyl methacrylate copolymer (EMMA), and ethylene-vinyl acetate Copolymer (EVA) or saponified product thereof, and polystyrene tree Polymethylmethacrylate resin can be used, and in addition to the above-mentioned thermoplastic resin, various resins such as acid-modified products can be used. A resin blended with resins may be used.
[0068]
Since this highly crystalline polyester has a function of microbial degradability, it has attracted attention as an environmentally non-polluting plastic.
[0069]
In the present invention, when the adherend that is the end surface to be sealed of the flange portion 7 of the molding container B that is covered with the lid material A is polyethylene resin (PE), the combination of base resin / thermoplastic resin for blending As polyethylene resin (PE) / ethylene-methacrylic acid copolymer (EMAA), polyethylene resin (PE) / ethylene-vinyl acetate copolymer (EVA), polyethylene resin (PE) / ethylene-acrylic acid copolymer A combination of (EAA) and polyethylene resin (PE) / ethylene-ethyl acrylate copolymer (EEA) is preferable.
[0070]
Next, when the adherend of the molding container B is a polystyrene resin (PS), the combination of the base resin / the thermoplastic resin for blending is an ethylene-vinyl acetate copolymer (EVA) / polybutene resin (PB). ), A combination of polyethylene resin (PE) + elastomer + petroleum resin / polybutene resin (PB).
[0071]
Next, when the adherend of the molded container B is a polypropylene resin (PP), the combinations of the base resin / the thermoplastic resin for blending are polypropylene resin (PP) / polystyrene resin (PS), polypropylene resin ( A combination of PP) / polyethylene resin (PE) is preferred.
[0072]
Also, Easy peel sealant layer The thickness of 5 is most desirably about 10 to 50 μm, preferably about 20 μm.
[0073]
As described above, the present invention provides the pattern printing ink layer 1 on the upper surface of the base 2 mainly composed of double-sided coated paper, single-sided art paper, etc. Base material The light-shielding coating layer 3 is provided on the lower surface of 2.
[0074]
next, Laminate material The light-shielding coating layer 3 penetrates from the lower surface of the light-shielding coating layer 3 over the entire surface at equal intervals, Base material After applying the half-cut line 6 reaching the middle layer of 2, Light-shielding coating layer 3 A reinforcing layer 4 made of Na ionomer resin is sequentially provided on the lower surface.
[0075]
Furthermore, it is the flange portion 7 of the molded container B. Adherend Is a polyethylene resin (PE), the base resin / blend thermoplastic resin combinations include polyethylene resin (PE) / ethylene-methacrylic acid copolymer (EMAA), polyethylene resin (PE) / ethylene-acetic acid. Easy peel sealant consisting of any one of vinyl resin (EVA), polyethylene resin (PE) / ethylene-acrylic acid copolymer (EAA), and mixed resin of ethylene-ethyl acrylate copolymer (EEA) Layers 5 are sequentially stacked.
[0076]
Or Adherend Is a polystyrene resin (PS), the combinations of base resin / blend thermoplastic resin include ethylene-vinyl acetate copolymer (EVA) / polybutene resin (PB), polyethylene resin (PE) + elastomer + petroleum An easy peel sealant layer 5 made of any one of mixed resins by a combination of resin / polybutene resin (PB) is sequentially laminated.
[0077]
Or Adherend Is a polypropylene resin (PP), the base resin / blend thermoplastic resin combination depends on the combination of polypropylene resin (PP) / polystyrene resin (PS), polypropylene resin (PP) / polyethylene resin (PE) The easy peel sealant layers 5 made of any one of the mixed resins are sequentially laminated.
[0078]
Aluminum made of a laminated material with excellent physical properties such as gas barrier properties, dead holdability, easy opening, no disposal problem, metal detectors, and good hygiene safety. The cover material A which does not use foil is provided.
[0079]
【Example】
Next, the lid material A of the present invention will be described in detail based on examples.
[0080]
<Example 1>
As shown in FIG. 1, the basis weight is 84.9 g / m. ² Using a double-side coated paper on a rolled-up base material 2 having a width of 1,000 mm, Double side coated paper After using a known gravure printing ink of four colors of known yellow, magenta, cyan, and black inks on the surface of the surface, a ramen pattern is printed by a known gravure printing method, Double side coated paper Similarly, the entire surface was solid-printed using a brown gravure printing ink by the gravure printing method to provide the light-shielding coating layer 3.
[0081]
Next, using the rotary die cutter, the whole surface solid printing is performed over the entire surface in the printing flow direction at intervals of 10 mm in the paper width direction. Light-shielding coating layer 3 From the bottom side Light-shielding coating layer A half-cut line 6 penetrating through 3 and reaching the intermediate layer of the double-side coated paper was applied in the thickness direction.
[0082]
next, Light-shielding coating layer No. 3 was coated with a known ozone treatment and a known isocyanate-based anchor coating agent by a gravure roll coating method on the upper surface of the entire solid printed surface, and then traded as Mitani DuPont Polychemical Co., Ltd. under the trade name High Milan (trademark) Was extruded by a 40 μm-thickness extrusion method to provide a reinforcing layer 4.
[0083]
next, Reinforcement layer 4 From the top surface, a product name CMPS (trademark) manufactured by Mitsui Dupont Polychemical Co., Ltd. was extruded as an easy peel sealant resin by extrusion, and an easy peel sealant layer 5 was provided by extrusion.
[0084]
The rolled-up laminated material having the above-described configuration was largely cut to produce a laminated material sheet having a width of 1,000 mm and a length of 1,000 mm.
[0085]
next, Laminated material sheet Was punched into a disk-shaped sheet having a diameter of 100 mm using a flat plate punching machine, and eight lid materials A were produced.
[0086]
On the other hand, Lid material In order to produce the molded container B corresponding to A, the thickness of the polyethylene resin (LDPE) is 20 μm by an extruder method on one side of a rolled-up cup base paper having a basis weight of 320 g / m 2 and a width of 1,000 mm. The laminated material was produced by melt extrusion.
[0087]
Next, in order to produce the body member and the bottom member constituting the cup-shaped molded container B Laminate material After slitting using a slitting machine equipped with a rotary cutting blade, For trunk Using the known yellow, magenta, cyan, and black process gravure printing inks on the surface of the laminated material, print the ramen pattern by a known gravure printing method, and then punch it into a fan-shaped form. Thus, a part to be a body part of the cup-shaped molded container B was produced.
[0088]
On the other hand, the laminated material of the bottom member was punched into a disk shape and simultaneously drawn to produce a part that would become the bottom of the cup-shaped molded container B.
[0089]
First, the fan-shaped body part is molded into a cup shape, Side edge The body of the molded container B was produced by heat sealing.
[0090]
next, Trunk The bottom part with a side wall with a drawing process is joined and integrated. container After making B, container The upper part of B was squeezed, and a cup-shaped molded container B for a ramen having a flange portion 7 was produced.
[0091]
Next, a low density polyethylene resin (LDPE) surface which is the upper end surface of the flange portion 7 of the molded container B, and Lid material Eight airtight sealant layers 5 were heat-sealed to prepare eight sealed containers.
[0092]
next, Sealed container Use 8 Molded container From the upper end surface of the flange portion 7 of B, Lid material A material breakage experiment was conducted to evaluate the presence or absence of tearing from the paper layer as the base material 2 by peeling A. The number of material breakage was not at all 8 and it was peeled off from the easy peel sealant layer 5 cleanly. The effect of the reinforcing layer 4 made of a system ionomer resin was observed.
[0093]
Furthermore, as a result of dropping one drop of salad oil with a dropper on the upper surface of the lid A prepared in the same manner as the effect of oil resistance, and evaluating the state of penetration in an environment of 60 ° C., even after 1 week There was no penetration.
[0094]
In addition, a paper pulp test method No. of JAPAN TAPPI. In the paper and paperboard specified in No. 41, the Kit value according to the oil repellency test method (kit method) also showed an oil resistance value of 9 or more.
[0095]
<Comparative Example 1>
As Comparative Example 1, a linear low density polyethylene resin (L-LDPE) is used for the reinforcing layer 4 only in the laminated material constituting the cover material A of the present invention, and the rest is the same as Example 1. As a result of performing the same test as in Example 1, the number of material breakage was 5 out of 8, and the oil resistance was infiltrated in 3 days, and the effect of the reinforcing layer 4 was completely absent. .
[0096]
【The invention's effect】
The present invention mainly comprises a paper layer. On substrate Light-shielding coating layer, Made of Na-based ionomer resin Reinforcement layer, It is formed from a mixed resin in which a thermoplastic resin is used as a base resin and an incompatible or partially compatible thermoplastic resin is blended with the base resin. Easy peel sealant layers are sequentially stacked Formed by lamination, and The light-shielding coating From layer Of the substrate Up to the middle class Due to the laminated material that has reached the half-cut line and imparted the dead hold property, even the laminated material that does not have aluminum foil, excellent physical properties such as gas barrier properties, good dead hold property, easy openability, and no disposal problem In addition, it is possible to provide a lid material that can be used with a metal detector and has good hygiene safety.
[Brief description of the drawings]
1 is a cross-sectional side view taken along the line XX of FIG. 2 showing a laminated material of a lid according to the present invention.
FIG. 2 is a plan view of a lid member according to the present invention.
FIG. 3 is a perspective view in which a lid according to the present invention is sealed in a molded container.
FIG. 4 is a side sectional view showing a conventional laminated material of a lid member.
FIG. 5 is a side sectional view showing a conventional laminated material of a lid member.
[Explanation of symbols]
A ... Cover material
B ... Molded container
1 ... Pattern printing ink layer
2. Base material
3 ... Light-shielding coating layer
4 ... Reinforcing layer
5 ... Easy peel sealant layer
6 ... Half cut wire
7 ... Flange
10 ... Pattern printing ink layer
11 ... Base material
12 ... thermoplastic resin layer
13 ... Aluminum foil layer
14 ... Easy peel sealant layer

Claims (2)

Seal portion of the flange portion and substantially the same shape to the flange portion of the molded container Te lid smell for molded container to seal the light-shielding coating layer on a substrate mainly composed of a paper layer, a reinforcing layer made of Na ionomer resin, An easy peel sealant layer formed of a mixed resin in which a thermoplastic resin is used as a base resin and a base resin is blended with an incompatible or partially compatible thermoplastic resin , and the light-shielding coating is sequentially formed. A lid material characterized by giving a half-cut line extending from the layer to the intermediate layer of the base material and imparting a dead hold property. The base resin is low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), high density polyethylene resin (HDPE), polypropylene resin (PP), ethylene-propylene copolymer (EP), ethylene-α olefin copolymer. Polymer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methacrylic acid ester copolymer, ethylene-acrylic acid ester copolymer, ionomer resin, ethylene-vinyl acetate The lid material according to claim 1, which is a copolymer (EVA) resin or a resin obtained by mixing these resins .

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