JP5838604B2 - Lid material - Google Patents

Description

  The present invention relates to a lid for a container that seals an article, and particularly relates to a lid that needs to expose a discharge hole for discharging a liquid such as water or hot water that has been put inside during use. Is a technique for imparting peelability when the discharge hole is exposed.

  2. Description of the Related Art Conventionally, instant food containers have been known as containers having a structure in which articles are usually sealed and stored, and liquids such as water and hot water, which are contained inside during use, are discharged to the outside through discharge holes. Instant foods that require such containers are, for example, fried noodles and spaghetti. When eating these instant foods, it is necessary to pour hot water and quickly drain the hot water from the container after a predetermined time (time for making the instant foods edible).

  As an example of the instant food container, one described in Patent Document 1 is known. The main body of the container is molded from a foamed polystyrene resin (PS) molded container, a polypropylene resin (PP) molded container, or a laminated material obtained by laminating a polystyrene resin (PS) sheet and a polyethylene terephthalate resin (PET) sheet. . Noodles, utensils, sauces and the like are stored in the container body. The container body is sealed by fitting a plastic molding lid, and the whole is shrink-wrapped with a shrink film. Stored in this packaging form.

  The lid described above is composed of an upper sheet called a top sheet and a lower sheet that forms the lower layer. This lower sheet is called a composite sheet made of a composite layer in Patent Document 1, and is closely attached to the edge of the opening of the container body so as to be peeled off. An easy release layer is formed by applying an easy release agent to a part of the arc-shaped region between the upper sheet and the lower sheet. For this reason, in the plan view, the portion where the easy-peeling layer is formed is divided into an easy-peeling region and an adhesive (non-peeling) region other than that.

  On the upper sheet, perforations are formed in a straight line along a straight line portion of the arc-shaped region of the easily peelable layer. In the easy peeling region of the lower sheet, a plurality of hot water cut holes 12 are formed so as to penetrate the front and back surfaces. Further, a hot water cutting pull tab is extended from a part of the end of the arc-shaped region of the upper sheet so as to protrude outward. On the other hand, an opening pull tab used to peel off the lid from the container body is extended in a part of the adhesion region so as to protrude outward.

  For this reason, at the time of eating, the user lifts the opening pull tab, partially opens the lid, and pours hot water into the container body. Thereafter, the pull tab for opening is closed and locked to bend at the edge of the container body, and waits for the cooking time by heating the hot water. Thereafter, the pulling tab for hot water cutting is pulled up from the lower sheet, the easy peeling area of the lower sheet is opened, and the arc-shaped area of the pulled up upper sheet is cut off from the perforation. Thereby, a plurality of hot water cutting holes 12 appear in the easy peeling region of the lower sheet. Therefore, the container is tilted and the hot water after cooking is discharged from the hot water cutting hole 12. When the hot water draining is finished, the pull tab for opening is pulled up again, and the lid is separated from the container main body, so that eating is possible.

  However, in the case of this container lid, an easy peeling layer must be partially provided at the peeling interface, and the complexity of the printing process and the positional accuracy between the post-processing and the peeling part greatly affect the product quality.

  Therefore, in order to improve this problem, a lid material described in Patent Document 2 has been proposed. This cover material has a base material in which a hot water cut hole is formed in a region offset to one edge and a surface material covering the base material, and a surface covering the hot water cut hole of the base material. A separation line is formed between one edge of the material and the other part of the surface material, and the edge of the surface material on the side of the hot water hole extends outward from this separation line to form a peeling tab In the hot-water lid material for instant foods, the base material and the surface material are laminated via an easily peelable laminated film composed of a first layer and a second layer that can be peeled and laminated together, It is characterized in that a hot water cutting hole is formed through the base material and the easily peelable laminated film, and the adhesive strength between the base material and the surface material is spread over the entire product and is laminated with a peelable strength. Therefore, the position accuracy of the hot water cut-out part arranged by half-cut processing after lamination is Warez, it is possible to peel off the surface material and the substrate.

  However, when the surface material of the hot water cut part is partially peeled on the hot water, the base layer is surrounded by the hot water cut hole as a result of softening of the resin of the easily peelable laminated film due to warming of the hot water. A peeling error occurs that falls from the surface material. On the other hand, it is necessary to provide restrictions on the waist strength and the shape of the hot water cut hole of the surface layer and the base material layer to improve the peelability.

JP 2000-203653 A JP 2004-59028 A

  The present invention is intended to solve the above-described problems, and its object is to improve the processability in printing, half-cutting, and punching, and is required when the user operates the hot water pull pull tab. Improve operational suitability, and when tearing off the hot water pull tab, there is no tearing of the lower sheet and no release of the lower sheet material in the hot water hole, so that the hot water hole (liquid discharge hole) appears in the peeling area. An object of the present invention is to provide a container lid that facilitates a hot water draining operation.

To achieve the above object, according to a first aspect of the present invention, there is provided a lid material that covers the flange formed along the edge of the opening of the container main body so as to be peelable and close. A sheet-like lid body integrally covering the opening and the flange, and extending integrally with the lid body so as to be located outside the flange; A first pull tab used when the lid body is separated from the opening, and a discharge hole that extends integrally with the lid body and discharges liquid from the container body are used to appear in the lid body. A second pull tab, wherein the lid body, the first pull tab, and the second pull tab are stacked on at least a lower sheet that has a lower surface releasably attached to the flange, and an upper surface of the lower sheet. And the top surface The lower body is formed of a laminated body having an upper sheet as a surface of the lid body, and connects the two points of the outer edge of the lower sheet located on both sides of the second pull tab across the root portion. A first half cut penetrating the lower sheet is formed from the lower surface of the sheet, and the lower half is formed in a partial region extending inward on the surface of the lid body with the first half cut as a starting line. A plurality of discharge hole half-cuts having desired shapes respectively corresponding to the plurality of liquid discharge holes in the container body and having a desired arrangement in the region so as to penetrate the lower sheet from the lower surface of the sheet Two positions on the outer edge of the upper sheet that are further from the second pull tab than the two points on the outer edge of the lower sheet on the surface of the lid body, or the surface of the lid body Above and below Two positions on the outer edge of the upper sheet, which coincide with the two points on the outer edge of the seat, are taken as two starting points, and extend from each of the two starting points toward the inside of the surface of the lid body. A second half-cut penetrating the upper sheet from the upper surface of the upper sheet so as to merge or substantially merge with a part of the uncut and define the partial area in the lid body. In the state where the portion of the lower sheet formed and peeled off from the second pull tab is attached to the partial region of the upper sheet, In the lid material characterized in that the part of the partial region of the sheet is configured to be peelable from the lower sheet,
The upper sheet is configured to be peelable from the entire lower sheet by interfacial peeling between the lower sheet, and of both interfaces between the upper sheet and the lower sheet, the interface of one sheet is The interface of the plastic material, the interface of the other sheet is an interface of a polyolefin-based adhesive resin, the plastic material is a biaxially stretched film, the interface of the biaxially stretched film with the adhesive resin, A coating layer for increasing the peel strength is laminated on the entire surface, and the varnish constituting the coating layer contains at least a nitrocellulose resin as a binder, and the component ratio is 10% or more and less than 70% by weight. The
As the binder component of the varnish, a urethane resin, the component ratio of lid, characterized in der Rukoto more than 30% by weight is.

Delete.

Delete.

In the second invention, the varnish contains at least one wax selected from silicon wax, polyester wax and fatty acid amide wax as a release agent, and the softening point thereof is 95 ° C. or higher and lower than 125 ° C. The lid material according to claim 1, wherein the lid material is added in an amount of 10 wt% or less based on the total amount of varnish solids.

In a third aspect of the present invention, the varnish contains an aromatic solvent and a non-aromatic solvent, and the amount of varnish is 0.5 to 3.0 g / m ^2. Or it is a lid | cover material of 2.

4th invention contains the aluminum foil in the said lower sheet, The thickness of the aluminum foil is 5 micrometers or more and 15 micrometers or less, The any one of Claims 1-3 characterized by the above-mentioned. It is a lid.

  In the first invention, the weight ratio of the nitrocellulose resin is limited for the binder component in the varnish. The film of nitrocellulose resin has heat resistance, and can secure a stable cohesive force without being softened even when heated. If the content of the nitrocellulose resin is less than 10%, the peelability is too good, resulting in poor adhesion. Moreover, heat resistance is insufficient, and the peel strength on hot water cannot be secured. If the content is 70% or more, the peel strength becomes excessive, and the peelability in the normal state cannot be obtained. Therefore, by limiting the content within this weight ratio, both the peelability and ensuring the strength on hot water are achieved. I can do it.

Delete.

In the first invention, the binder component in the varnish, and a combination of urethane resins and nitrocellulose resins, and limit its component ratio. Urethane resin has good compatibility with nitrocellulose resin. Utilizing the property of softening when heated, by limiting the component ratio with nitrocellulose resin, the peel strength and temperature dependence are adjusted, Can be exhibited.

In the second invention, the softening point and addition amount of the wax component added to the varnish are limited. The wax component softens especially when heated on hot water, and is added for the purpose of improving the peelability. However, if the wax has a softening point of 95 ° C. or less, the adhesive strength when heated is extremely high. When the temperature is 125 ° C. or lower, the coating layer is not sufficiently softened by heating on hot water, and the peelability is not improved. In addition, with respect to the addition amount of the wax, when it is 10% by weight or more, the compatibility with the binder component, the stability of the coating liquid is reduced, and the peel strength on the hot water is extremely deteriorated. By limiting to the said range, the peelability on hot water is ensured.

In the third invention, the amount of varnish applied is limited. The lid material of the present invention is a mechanism that imparts peelability by cohesive failure of the coating layer laminated with the varnish, but when the coating amount is 0.5 g / m ² or less, a stable coating layer is obtained. In addition, the cohesive failure of the coating layer and the interfacial delamination between the layers adjacent to the coating layer are mixed, and a uniform delamination strength and delamination feeling cannot be obtained in all regions. Moreover, since the absolute amount of the wax component contained in a coating layer increases in the case of 3.0 g / m < ² > or more, the peeling strength on hot water reduces. Further, laminating an excessive coating layer also has an adverse effect on cost. Therefore, the coating amount is limited within this range.

In 4th invention, when aluminum foil is contained in a lower sheet, the thickness of the aluminum foil is limited. When the aluminum layer is less than 5 μm, the desired deadfold property for laminating the aluminum foil cannot be obtained, and the curl suppressing effect is insufficient. In addition, when the aluminum layer is 15 μm or more, as a result of excessively increasing the waist strength of the lower material, the lower sheet surrounded by the hot water cutting holes does not follow the curvature of the upper sheet when peeling the upper sheet of the hot water cutting region. Accidents that fall on the product occur, and handling difficulties such as cutting hands on the side of the product also occur. And there also exists a problem that it is economically inferior by employ | adopting excessive material thickness.

  By adopting the laminated structure provided by the lid material of the present invention, the production suitability is good, and the hot water stripping part peeling suitability on the hot water and the adhesive strength of the hot water hole area are compatible, and the outer shape of the hot water cutting part and the shape of the hot water hole A container lid with a hot water cutting function can be obtained with a wide degree of freedom, and its peelability does not deteriorate even under long-term storage, and exhibits excellent practical effects.

It is a general-view figure when the example of the cover material of this invention is seen from the front. It is the cross-sectional schematic of the whole container using the cover material of this invention. It is the cross-sectional schematic which expanded a part of lid | cover material of this invention.

An embodiment of a lid according to the present invention will be described with reference to FIGS.
As shown in the cross section of FIG. 3, the lid material (41) of the present invention is laminated so that the lower sheet (52) and the upper sheet (51) covering the lower sheet (52) can be peeled with almost uniform adhesive force over the entire area. Has been. Between the lower sheet (52) and the upper sheet (51), a coating layer (55) is formed as a peeling layer by interfacial peeling. That is, the upper sheet (51) and the lower sheet (52) are laminated on each other with the coating layer (55) which is a peeling layer by this interfacial peeling. The cover material (41) is formed by laminating the lower sheet (52) and the upper sheet (51) covering the same so as to be peeled off in the coating layer (55) serving as an adhesion interface with substantially uniform adhesive force over the entire region. A laminated body is formed. There are no particular restrictions on the material and configuration of the upper sheet (51) and the lower sheet (52), but various performances required for the entire lid material, operability when peeling the upper sheet, and economic efficiency, etc. In order to be satisfied, the most preferred configuration is determined.

  Further, in the vicinity of the discharge pull tab (45) shown in FIG. 1, there are a plurality of discharge hole half cuts (47a) penetrating the lower sheet (52) in the vertical direction for forming the discharge hole (47). The upper sheet (51) is vertically arranged at a position that separates the peeling area A including the discharge pull tab (45) and the discharge hole (47) and the non-peeling area B including the opening pull tab (43). A partial peeling half cut (46a), which is a second half cut penetrating in the direction, is arranged. By pulling the discharge pull tab (45) to peel off the upper sheet (51) of the peeling area A, the lower sheet (52) inside the discharge hole half cut (47a) is accompanied by the upper sheet (51). By removing it, the discharge hole (47) can be exposed.

Next, the usage method of the container using the lid | cover material (41) which concerns on this embodiment is demonstrated with reference to FIG. 1, FIG.
The contents are stored in the container (40), and the lid (41) is heat-sealed to the flange (42) of the container. At the time of eating, the opening pull tab (43) is first opened slightly, and a predetermined amount of hot water is poured. The opening pull tab (43) is preferably hooked to the flange and resealed. After the lapse of the specified time, the discharge pull tab (45) is pulled up to remove only the upper sheet (51). At this time, if the pull tab half cut (45a), which is the first half cut penetrating only the lower sheet, is provided at the base of the discharge pull tab (45), only the upper sheet can be smoothly peeled off. it can. Since the discharge hole (47) is exposed by this operation, the container is inclined and hot water is discharged from the discharge hole.
In the coating layer (55) which is an adhesive interface between the upper sheet (51) and the lower sheet (52), one side is a biaxially stretched film (26) and the other side is a polyolefin-based adhesive resin (25). It is set as the structure which is. As a result, it is possible to easily exhibit appropriate peelability stably. In this case, whichever comes to the upper sheet side or the lower sheet side can be either case depending on the target layer configuration.

  In the present invention, it is possible to further optimally set the peelability by laminating a coating layer for increasing the peel strength on the one surface of the above-mentioned biaxially stretched film and the adhesive interface with the adhesive resin. .

  The most common layer structure of the cover material is as follows: paper / polyolefin adhesive resin as the upper sheet in order from the top; coating layer / biaxially stretched film / adhesive / gas barrier layer / adhesive resin layer as the lower sheet from the top / Structure of sealant layer.

The paper (22), a basis weight of 79.4g ^{/ m 2} ~127.9g ^/ m 2 about one-sided art paper or single-sided coated paper, quality paper, or the like. Further, the surface of the paper is usually subjected to printing necessary as a final product, protective varnish, or the like.

Examples of the polyolefin adhesive resin (25) include a low density polyethylene (LDPE) resin, a high density polyethylene (HDPE) resin, a linear low density polyethylene (LLDPE) resin, a polypropylene (PP) resin, and a polyolefin elastomer. A polyolefin resin is used.
As the biaxially stretched film (26), a biaxially stretched polyethylene terephthalate resin (PET) film, a biaxially stretched PP film (OPP), a biaxially stretched nylon film, or the like is used.

  As the gas barrier layer (23), a metal foil such as an aluminum foil, or a gas barrier film such as a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene vinyl alcohol copolymer film, a gas barrier nylon film, a gas barrier polyethylene terephthalate film, Inorganic oxide vapor-deposited film in which inorganic oxide such as aluminum oxide or silicon oxide is vapor-deposited on PET film, etc., or film or metal alkoxide containing polyvinylidene chloride coating, water-soluble resin and inorganic layered compound or its hydrolysis A gas barrier coating layer such as a resin layer made of a film obtained by reacting a product with an isocyanate compound can be used.

  When an aluminum foil having a thickness of 5 μm or more and 15 μm or less is used for the lower sheet as the gas barrier layer (23), the light shielding property is sufficiently ensured in addition to the gas barrier property. Especially when using a soft aluminum foil, when the upper sheet of the discharge hole part is peeled off, the elastic repulsion force generated in the direction in which the lower sheet inside the discharge hole half cut is separated from the upper sheet is reduced, and In addition to providing the opening retention required when opening the pouring gate, the deadfold property is improved when the unsealed portion is resealed after being once opened and poured with hot water. When the thickness of the aluminum foil is less than 5 μm, it is difficult to handle, and the deadfold property is inferior. If the thickness exceeds 15 μm, there is too much waist, which is not preferable and economically inferior.

As the sealant layer (27), polyolefin resin is generally used. Specifically, low density polyethylene, medium density polyethylene, linear low density polyethylene, ethylene / vinyl acetate copolymer, ethylene / α-olefin are used. Copolymers, ethylene resins such as ethylene-methacrylic acid resin copolymers, blend resins of polyethylene and polybutene, homopolypropylene, propylene / ethylene random copolymers, propylene / ethylene block copolymers, propylene / α Polypropylene resins such as olefin copolymers are used.
The sealant layer (27) may be a single layer of the above material, but when an expensive easy peel sealant is used, it may be co-extruded with an adhesive resin to make the sealant layer thin.

  Moreover, although the limited content of the varnish which forms a coating layer (55) has already been demonstrated in the above-mentioned item, first, about the resin material used by this invention, a nitrocellulose resin reacts natural cellulose and nitric acid. And obtained as a nitrate ester in which the three hydroxyl groups in the 6-membered ring of the anhydrous glucopyranose group in natural cellulose are substituted with nitrate groups, and those having an average degree of polymerization in the range of 50 to 150 are preferred. Used for. When the average degree of polymerization is less than 50, the easily peelable region A to be formed has a problem that the surface tack is not cut well and does not peel off. This is not preferable because it causes a decrease.

A method of laminating a co computing layer, on one surface of a biaxially stretched film, the above-mentioned varnish laminated by gravure printing process, the preferred method of laminating the other substrate.

Hereinafter, based on an Example, Embodiment of the cover material which concerns on this invention is described further more concretely.
< Reference Example 1>
First, the formulation of the varnish for forming the coating layer will be described.

<Adjustment of nitrocellulose varnish>
30 parts of nitrocellulose (manufactured by Asahi Kasei Co., Ltd.) having an average degree of polymerization of 50 were mixed and dissolved in 30 parts of ethyl acetate and 40 parts of isopropyl alcohol to obtain a test nitrocellulose varnish 1 having a solid content of 30%.

<Adjustment of polyamide varnish>
Polyamide varnish 2 for testing having a solid content of 30% by mixing and dissolving 30 parts of a polyamide resin (Rheamide S-2110PL manufactured by Kao Corporation) having a softening point of 105 ° C to 111 ° C in 50 parts of toluene and 20 parts of isopropyl alcohol. Got.

<Adjustment of polyurethane varnish>
In a four-necked flask equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen gas inlet tube, 315.34 parts of a polyester diol having a number average molecular weight of 2000 obtained from adipic acid and 3-methyl-1,5-pentanediol 63.08 parts of isophorone diisocyanate and 60.0 parts of ethyl acetate were charged and reacted at 90 ° C. for 6 hours under a nitrogen stream. Subsequently, 20.83 parts of isophorone diamine, 0.75 part of acetamide, 440.0 parts of ethyl acetate, and 210.0 parts of isopropyl alcohol were added to obtain a polyurethane resin varnish 3 for testing having a solid content of 40%.
The test nitrocellulose varnish 1, test polyamide varnish 2, test polyurethane resin varnish 3 and polyethylene wax (softening point 104 ° C.) obtained by the above formulation were mixed under the mixing conditions shown in Table 1 (A). to obtain a varnish A~E.

Next, the processing method of a laminated body is demonstrated. PET film (manufactured by Toyobo Co., Ltd.: E5200 (thickness 12 [mu] m, both surfaces corona treated)) on one side of, after 0.6 g / ^{m 2} coated by a gravure printing process the varnish A, uncoated surface and the aluminum foil (Sumitomo Aluminum Co. Manufactured: Soft aluminum foil (thickness 9 μm) was bonded with a dry laminate adhesive. Next, the PET coating surface of the obtained laminate and paper (manufactured by Oji Paper Co., Ltd .: single-sided art paper (gravure art basis weight 84.9 g / m ² )) were combined with LDPE (Sumitomo Chemical Co., Ltd .: L2340E (thickness)). 20 μm)) was laminated by extrusion lamination to obtain a laminate. The temperature under the die during extrusion was 320 ° C. Thereafter, an adhesive resin (manufactured by Mitsui DuPont: EMAAN1108C (thickness 10 μm)) and an easy peel sealant layer (manufactured by Mitsui DuPont: VN503 (thickness 10 μm)) are coextruded as a sealant layer on the aluminum foil surface of the laminate. Lamination was performed to obtain an upper sheet / lower sheet laminate.

  From the side of the sealant surface of the obtained laminate, a discharge hole half cut and a pull tab half cut having the shape shown in FIG. 3 were formed. From the sealant layer side, the peeling start line and the exhaust hole half cut were formed as cut lines having a depth reaching the LDPE layer of the intermediate layer. On the other hand, from the paper surface side, the half-cut for partial peeling was formed as a cut line having a depth reaching the PET film. The width of the discharge hole was 6 mm and the length was 6 mm.

<Example 1 >
A lid was prepared in the same manner as in Reference Example 1 except that varnish B was used instead of varnish A on one side of the PET film and a coating layer having a coating amount of 0.8 g / m ² was provided.

< Reference Example 2 >
A cover material was prepared in the same manner as in Reference Example 1 except that varnish C was used instead of varnish A on one side of the PET film and a coating layer having a coating amount of 1.5 g / m ² was provided.

< Reference Example 3 >
A lid was prepared in the same manner as in Reference Example 1 except that varnish A was used on one side of the PET film and the coating layer was applied in an amount of 2.5 g / m ² .

<Comparative Example 1>
A lid was prepared in the same manner as in Reference Example 1 except that varnish D was used instead of varnish A on one side of the PET film and a coating layer was provided.

<Comparative Example 2>
A lid was prepared in the same manner as in Reference Example 1 except that varnish E was used instead of varnish A on one side of the PET film and a coating layer was provided.
Table 1 (B) summarizes the manufacturing conditions of the lid materials related to the above Examples, Reference Examples and Comparative Examples.

The lid material manufactured under each of the above conditions was heat-sealed to the flange of a foamed polystyrene resin cup to complete the container. Thereafter, the pull-out pull tab was lifted, and the upper sheet of the discharge area was peeled and removed, and normal peel evaluation was performed. Moreover, hot water peeling was evaluated by peeling off and removing the upper sheet of the discharge area after pouring hot water from a part of the opening of the container to the marked line, resealing the opening and holding it for 3 minutes. The results of the peelability at this time are shown in Table 1 (C).

For the reference of the release of the evaluation results: the evaluation result of ○ × is a comprehensive evaluation of the release performance shown below, peeling ○ if there is no falling off of the discharge hole I Umakui, peeling does not work emissions results of evaluation are shown in two display × when the Tsu falling there sections.
Paper breakage: Evaluation was made in two categories, when no paper breakage occurred when peeling and when paper breakage occurred.
Hole remaining: Evaluation was made in two categories: the case where the lower sheet part forming the discharge hole is attached to the upper sheet as it is peeled off and the discharge hole remains without accompanying (the discharge hole does not open properly) .
Hole drop: Evaluation was made in two categories: the case where the lower sheet portion forming the discharge hole dropped from the upper sheet along with peeling and the case where it did not fall (the discharge hole was opened properly).

From the results shown in Table 1, it can be seen that the lid material having the structure shown in the above-described Examples and Reference Examples has good peelability in the peeled region, no hole dropping, no hole residue, and stable performance.
Therefore, if the configuration of the discharge hole of this embodiment is adopted, in addition to the advantages obtained in the above-described embodiment and its modifications, the configurations described in Patent Document 1 and Patent Document 2 that have been conventionally known In contrast, the present invention can exhibit excellent effects. This is described below.

  In other words, by adopting a laminated structure that can be peeled over the entire surface, the registration accuracy during processing is reduced, and as a result, product quality can be greatly improved.

In the present embodiment, one side is a biaxially stretched film and the other side is a polyolefin-based adhesive resin in the adhesive interface where the upper sheet and the lower sheet are laminated so as to be peelable. For this reason, it becomes easy to exhibit moderate peelability stably. This is because, when performing thermal bonding with an adherend container, if the peeling interface is an interface between adhesive resins, there is a large effect on the adhesive strength due to heat, but at the interface between the biaxially stretched film and the adhesive resin, The adhesive strength is maintained by the thermal stability of the biaxially stretched film layer, and stable peelability can be exhibited.

Furthermore, when a coating layer for increasing the peel strength is included in the adhesive interface, the weight of peeling when the hot water sheet is partially peeled can be designed optimally and easily. Also, the varnish for forming a coating layer contains nitrocellulose resins as a binder, by its component ratio is 10% to 70% by weight is, the adhesive aptitude in the peeling aptitude after pouring, pressing It is possible to avoid a reduction in peel strength when the temperature is warm and when steam is present at the peel interface.

  Moreover, according to this embodiment, since the lower sheet contains the aluminum foil, there are various advantages as follows. That is, the gas barrier property and the light shielding property of the lid material are improved, and the storage stability of the contents is enhanced. Further, when the upper sheet in the peeling region is partially peeled, the elastic repulsive force generated in the direction in which the lower sheet inside the discharge hole half cut is separated from the upper sheet can be reduced. Moreover, opening retainability required when opening a pouring gate can be provided. Furthermore, the dead hold property is good when the unsealed portion is resealed after opening and pouring hot water.

  As described above, according to the present embodiment, in the cover material having a laminate structure that can be peeled over the entire surface, regardless of the shape of the discharge hole defined by the discharge hole half cut, The lower sheet portion can be reliably attached to the upper sheet, and the discharge hole can appear by peeling and removing with a stable peeling strength. As a result, it is possible to adopt shapes other than the round shape that is easy to peel off and the horizontally long track shape as the shape of the discharge hole, thereby providing advantages such as improved hot water discharge speed and increased design flexibility. can get.

  Therefore, according to the present invention, it is possible to obtain an instant food container lid material with a hot water cut which has an appropriate peel strength and a good peel appearance in production, and its peelability does not deteriorate even under long-term storage. As a container lid material, it exhibits excellent practical effects.

26 ... Biaxially stretched film 23 ... Aluminum foil 27 ... Sealant layer 40 ... Container 41 ... Cover material 42 ... Flange 43 ... First pull tab (pull tab for opening)
45 ... Second pull tab (pull tab for discharge)
45a ... First half cut (half tab cut)
46a ... Second half cut (half-cut for partial peeling)
47 ... Discharge hole 47a ... Discharge hole half-cut 51 ... Upper sheet 52 ... Lower sheet 55 ... Coating layer A ... Partial area including release hole (peeling area)
B ... Partial area including pull tab for unsealing (non-peeling area)

Claims (4)

A lid member that is peelably attached to a flange formed along the edge of the opening of the container body, and has a size substantially equal to the outer shape of the flange, and the opening and the flange are integrated. A sheet-like lid body that covers the first body, a first pull tab that extends integrally with the lid body so as to be positioned outside the flange and is used when the lid body is separated from the opening, and the lid A second pull tab that extends integrally with the main body and is used when a discharge hole for discharging the liquid from the container main body appears in the cover main body, the cover main body, the first pull tab, and the first pull tab The pull tab 2 is composed of a laminate including at least a lower sheet that has a lower surface that is releasably adhered to the flange, and an upper sheet that is laminated on the upper surface of the lower sheet and that has the upper surface as the surface of the lid body. ,Previous A first half cut that penetrates the lower sheet from the lower surface of the lower sheet is formed so as to connect the two points of the outer edge of the lower sheet located on each of both sides crossing the root part of the second pull tab, The liquid in the container main body passes through the lower sheet from the lower surface of the lower sheet into a partial region extending inward on the surface of the lid main body with the first half cut as a starting line. A plurality of discharge hole half-cuts each having a desired shape corresponding to each of the plurality of discharge holes and having a desired arrangement in the region are formed from the second pull tab on the surface of the lid body. Two positions on the outer edge of the upper sheet that are respectively farther than the two points on the outer edge of the sheet, or the two points on the outer edge of the lower sheet on the surface of the lid body. Two on the outer edge The positions are set as two starting points, extend from the two starting points toward the inside of the surface of the lid body, and merge with each other or partially merge with each other in a state in which a part is left uncut. A second half cut penetrating the upper sheet from the upper surface of the upper sheet is formed so as to define a region in the lid body, and the half cut for the discharge hole is formed by peeling off the second pull tab. The part of the partial region of the upper sheet is configured to be detachable from the lower sheet in a state in which the part of the attached lower sheet is attached to the partial region of the upper sheet. In the characteristic lid material,
The upper sheet is configured to be peelable from the entire lower sheet by interfacial peeling between the lower sheet, and of both interfaces between the upper sheet and the lower sheet, the interface of one sheet is The interface of the plastic material, the interface of the other sheet is an interface of a polyolefin-based adhesive resin, the plastic material is a biaxially stretched film, the interface of the biaxially stretched film with the adhesive resin, A coating layer for increasing the peel strength is laminated on the entire surface, and the varnish constituting the coating layer contains at least a nitrocellulose resin as a binder, and the component ratio is 10% or more and less than 70% by weight. The
Wherein as the binder component of a varnish, a urethane resin, a lid member to which the component ratio, characterized in der Rukoto least 30% by weight is.   The varnish contains at least one wax selected from silicon wax, polyester wax, and fatty acid amide wax as a release agent, and has a softening point of 95 ° C. or higher and lower than 125 ° C. The lid material according to claim 1, wherein the lid material is added in an addition amount of 10% by weight or less based on the total amount. The lid according to claim 1 or 2, wherein the varnish contains an aromatic solvent and a non-aromatic solvent, and the amount of the varnish is 0.5 to 3.0 g / m ^2. Wood.
The lid material according to any one of claims 1 to 3 , wherein the lower sheet contains an aluminum foil, and the thickness of the aluminum foil is not less than 5 µm and not more than 15 µm.

Images