JP2010280422A - Functional lid material having easy peelability - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the possibility of any breakage of a material when peeling off a film from a lid material, and to prevent any slug portion of a hot water draining hole from being dropped. <P>SOLUTION: A lid material has a lid-opening knob (5) which is formed of a laminate film in which an upper side layered body (1a) made of a base material layer (1) and an easy-peel layer (3a) capable of executing the surface-to-surface seal peeling, and a lower side layered body (4a) made of an easy-peel layer (3b) and a container-sticking easy-peel layer (4) are layered in this order from the outer side, and projecting outward of a flange part (8) of the lid to be thermally stuck to a flange (7) of a container. The upper side layered body (1a) and the lower side layered body (4a) are sealed in a perfect seal area (A) formed inside of the flange part (8) of the lid, manufacturing a functional lid material in which a through-hole (2) for the hot water draining hole is formed in an area inside the position of the flange part (8) of the lid on the lower side layered body (4a) in an area other than the seal area (A). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention has an easy peel layer that can be peeled off face to face, and the easy peel layer can easily change the seal strength by adjusting the sealing conditions, and is sealed with the easy peel layer. The present invention relates to a functional lid member that can open a hot water cut hole by peeling off the seals that are present to perform a function such as hot water cut.

  Conventionally, for example, a structure of a paper base material, an aluminum foil, and a sealant in order from an outer layer is known as a structure of a cover material provided with a hot water cutting hole such as an instant cup noodle cover material with a hot water cutting function. Among them, as a mechanism for causing hot water cut holes to appear, a release varnish is applied to the back side of the paper substrate, laminated using aluminum foil and extruded resin, and then in close contact with the container, and an easily peelable sealant Is formed, and a half cut structure from the sealant side of the laminate to the paper substrate is formed. There has been reported a method in which a hot water cut hole appears by peeling the paper substrate, that is, by interfacial peeling between the paper substrate and the peeling varnish and the extrusion resin or cohesive peeling between the extrusion resin. (For example, refer to Patent Document 1).

  However, the type using a release varnish requires the application of the release varnish only to the portion of the back side of the paper substrate excluding the area of the hot water cut hole. Since it is necessary to half-cut along the coated part, there is a problem that processing accuracy is required even during half-cut processing. Also, even if the half-cut position is shifted by 1 mm, the material of paper substrate and aluminum foil There was a problem that could cause damage.

  In addition, in Patent Document 2 and the like, as an instant cup noodle lid material with a hot water cutting function, a half cut from a sealant to a film base material in a laminate of a paper base material, a film base material, an aluminum foil, and a sealant in order from the outer layer. A lid member in which is formed is disclosed. The film base and the aluminum foil are bonded by the polyolefin resin adhesive layer, and the contact surface of either the film base or the aluminum foil in contact with the resin is not subjected to the anchor coating treatment, and the paper base. A peeling method using an interfacial peeling mechanism between a film substrate containing a material and an aluminum foil has been reported.

  However, in the case of this method, the cut-off portion of the hot-water cut hole remaining on the film base material that is peeled off when forming the hot-water cut-off hole is similarly low in adhesive strength with the film base material, so that the hot-water cut hole is formed. When the film base material is peeled off, there is a possibility that the residue will fall and be mixed into food.

JP 2003-40354 A JP 2005-67695 A

  The object of the present invention is to break the paper base material and aluminum foil material when peeling the film from the lid material in order to make the lid material perform a function such as hot water cutting. It is an object of the present invention to obtain a functional lid material that does not have a possibility of falling and that there is no possibility of dropping of a drained portion of a hot water cut hole remaining on a film base material to be peeled.

  In order to solve the above-mentioned problems, the present invention provides an upper laminate comprising at least one base material layer (1) of a paper base material or a plastic film and an easy peel layer (3a) that can be peeled off face to face. A lower laminated body (4a) comprising (1a), an easy peel layer (3b), and a container-adhesive easy peel layer (4) formed directly or via a second base material layer is A lid material comprising a laminated film sequentially laminated, and having a lid knob (5) projecting outward from a flange portion (8) of the lid material thermally bonded to the flange (7) of the container, The upper laminated body (1a) and the lower laminated body (4a) are sealed by a complete seal region (A) formed inside the flange portion (8), and the lower laminated layer in a region other than the seal region (A). On the body (4a) Is a functional lid which is characterized in that it has a through hole for hot cutting hole (2) in a region inside than the position of the flange portion of the timber (8).

  In the present invention, the easy peel layer (3a) and the easy peel layer (3b) have a transition temperature of low peel strength (0.1 to 5.0 N / 15 mm) and high peel strength (20 to 40 N / 15 mm). The functional lid material is characterized in that the temperature is 150 ° C. to 170 ° C.

  Further, the present invention is the above functional lid material, wherein the container-adhesive easy peel layer (4) has a peel temperature of 5 to 10 N / 15 mm at a seal temperature of 100 ° C. to 200 ° C. .

  Further, the present invention provides the above-described functional lid material, wherein the hot water cut hole forming knob (6) connected to the upper laminate (1a) and not connected to the main body of the lower laminate (4a) The functional lid material is characterized in that it is formed to project outward from the flange portion (8) of the lid member at the counter electrode position of the lid member from the lid opening knob (5).

  The present invention also relates to an easy peel layer (3a) and an easy peel transition temperature of 150 ° C. to 170 ° C. between a low peel strength (0.1 to 5.0 N / 15 mm) and a high peel strength (20 to 40 N / 15 mm). Using the peel layer (3b), the upper laminate (1a) is produced by laminating the easy peel layer (3a) on at least one substrate layer (1) of a paper substrate or a plastic film. A step of manufacturing a lower laminate (4a) in which the easy peel layer (3b) is laminated with the container base easy peel layer (4) directly or via the second base material layer, A step of forming a through hole (2) for hot water cutting holes in a region inside the side laminate (4a) inside the position of the flange portion (8) to be thermally bonded to the flange (7) of the container; Said easy of body (1a) The peel layer (3a) and the easy peel layer (3b) of the lower laminate (4a) are brought into contact with each other and laminated, and at that time, a complete seal region (A) inside the flange portion (8) of the lid member (A) ) At a temperature of 170 ° C. or higher and the other regions are sealed at a temperature of 150 ° C. or lower.

  According to the present invention, the lid member has an easy peel layer that can be peeled off face to face, and the easy peel layer can easily change the seal strength by adjusting the seal conditions. By peeling off the seals that are sealed with, it becomes possible to open a hot water cutting hole and perform functions such as hot water cutting. As a result, there is no risk of breakage of the paper base material or aluminum foil material, and there is no possibility of dropping of the drainage portion of the hot water hole remaining on the film base material to be peeled off when forming the hot water hole. There is an effect that a material is obtained.

It is a top view of the lid | cover material of this invention. It is the cross-sectional schematic of the layer structure of the lid | cover material of this invention, and the flange of a container. It is a graph of the peel strength of the Example of this invention. It is a graph of the peel strength of a comparative example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a top view of the lid member of this embodiment. FIG. 2 shows a schematic cross-sectional view of the layer structure of the lid member of this embodiment. In the lid material in which a hot water cutting hole appears by peeling the surface base material among the lid materials aimed at the hot water lid of the prior art, the conventional technology using the peeling varnish as in Patent Document 1, Since it is necessary to apply the release varnish only to the back surface of the base material layer (1) made of a paper base material except for the hot water hole, not only the coating accuracy is required, but also the release varnish was applied. Since it is necessary to half-cut along the part, processing accuracy is required even during half-cut processing, and even if the half-cut position is shifted by 1 mm, the base material layer (1) made of a paper base material or aluminum foil material There was a problem that damage might occur.

  In other conventional techniques, as in Patent Document 2, a hot water cut-off hole is formed in a conventional technique using an interfacial peeling mechanism using a polyolefin resin between a base material layer (1) including a paper base material and an aluminum foil. Since the adhesive strength with the film substrate side is also low, the drained residue part of the hot water hole that remains on the film substrate that is peeled off when it is peeled off may fall and be mixed into food at the time of peeling, etc. There was a problem.

  In this embodiment, as shown in FIG. 2, the easy peel layer (3a) of the upper laminated body (1a) and the easy peel layer (3b) of the lower laminated body (4a) on the container side are brought into contact with each other for sealing. And a cover material formed by cutting out the outer shape from a laminated film that can be peeled off on its surface by punching or the like. Here, before laminating with the upper laminated body (1a), the lower laminated body (4a) is thermally bonded with the through hole (2) for hot water cutting holes and the lid material on the flange (7) of the container. A portion of the surface of the lid material inside the flange portion (8) of the lid material is punched into a circular or square shape having a short side of 10 mm or less and a long side of 30 mm or less. The easy peel layer (3a) of the upper laminate (1a) and the easy peel layer (3b) of the lower laminate (4a) can be easily changed in seal strength by adjusting the sealing conditions. Use layers. Further, a knob forming cut (2b) is provided in the lower laminate (4a) on the container side. The through-hole (2) of the lower laminate (4a) by peeling the upper laminate (1a) and the lower laminate (4a) at the interface between the easy peel layers (3a) and (3b) of the lid And the through hole (2) serves as a hot water cutting hole.

  Further, the lid member is formed with a hot water hole forming knob (6) protruding outward from the flange portion (8) of the lid member to be thermally bonded to the flange (7) of the container as follows. . That is, this hot water cut hole forming knob (6) is formed on the lower laminate by forming a knob forming cut (2b) from the container side at a position outside the flange portion (8) of the lid. It is separated from the main body of (4a), and is formed in a structure connected to the main body of the upper laminate (1a). In the hot water cut hole forming knob (6), the lower laminated body (4a) portion separated from the main body of the lower laminated body (4a) may be left, or the hot water slicer from which the laminated body (4b) portion is removed. A hole forming knob (6) may be formed. Further, the lid opening knob (5) is formed so as to protrude outward from the flange portion (8) of the lid material at the counter electrode position of the lid material with respect to the lid hole forming knob (6) of the lid material. By using this lid material, there is no risk of damage to the material of the base material layer (1) and the aluminum foil, which has been a problem in the past, and there is an effect that the peelability is smooth. Moreover, the functional lid | cover material from which the dregs part of the hot-water hole left in the peeled upper laminated body (1a) does not fall can be provided.

Examples of the base material layer (1) made of a paper base material include art paper, coated paper, high-quality paper, bleached kraft paper, and the like, but are not particularly limited. There is no particular provision for Kamitsubo amount is preferably a ^{50~250g / m 2, 80~150g / m} 2 is more preferable. Moreover, you may provide the printing which provides a pattern and light-shielding property to the surface and back surface of the base material layer (1) which consists of paper base materials.

  When the base material layer (1) is formed of a plastic film, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), A heat-resistant plastic film such as polyvinyl chloride, polyimide, or a copolymer of these polymers can be used for the base material layer (1). The thickness is not particularly specified, but is preferably 10 to 300 μm, more preferably 10 to 200 μm. Further, for example, additives such as an antistatic agent, an ultraviolet absorber, a plasticizer, a lubricant, and a colorant can be added, and they are appropriately added as necessary. In addition, you may use the base material layer (1) which laminated | stacked the printing which gives light-shielding property to the inner surface of the base material layer (1) of these plastic films, or the film of a light-shielding material, and has barrier property. But it ’s okay.

  The same material can be used for the two easy peel layers (3a) and (3b). They can be peeled off face to face, and the seal strength can be easily changed by adjusting the sealing conditions. Easy peel sealant that can be used. For example, when the seal temperature is 120 ° C. to 150 ° C., the peel strength is 0.1 to 5.0 N / 15 mm, and when the seal strength is 170 ° C. or higher, the peel strength is 20 to 40 N / 15 mm. An easy peel sealant whose strength changes extremely in two stages is desirable.

  In particular, the easy peel layers (3a) and (3b) have a transition temperature of 150 ° C. to 170 ° C. with a low peel strength (0.1 to 5.0 N / 15 mm) and a high peel strength (20 to 40 N / 15 mm). It is desirable to use an easy peel sealant. Thereby, since the transition region of the seal temperature is 20 ° C., the seal temperature can be easily controlled during processing.

  These characteristics can be realized by using an easy peel sealant in which the support layer resin of the sealant is composed of at least two types and each has a large melting point. Furthermore, PE (polyethylene; melting point: 130 ° C.) or PP (polypropylene; melting point: 170 ° C.), which is generally called “sea-island structure”, is used as a support layer resin, and there is spherical PS (polystyrene; melting point: 230 ° C.). By making an easy peel sealant blended with a substance having a high melting point, an effect is obtained that makes it possible to satisfy both seal stability and low peel strength.

  For this easy peel sealant, it is desirable to use an ionomer with good heat sealability. An ionomer is a thermoplastic resin obtained by partially crosslinking a copolymer of ethylene and methacrylic acid with metal ions (sodium, zinc, etc.). The ionomer has excellent processability because the ion cross-linking force between the molecules relaxes and flows easily when heated, and the ion cross-linking structure allows various heat sealability, deep drawability, toughness, oil resistance, pinhole resistance, It has excellent characteristics such as transparency.

  That is, when the maximum seal strength, the low temperature seal property, the hot seal property, the foreign matter seal property, the suitable seal temperature range, and the like are evaluated, a high evaluation can be obtained for any item. Among them, the hot sealing property (hot tack property) is good, the melting point is about 20 ° C. lower than that of low density polyethylene resin (LDPE), and the melt viscosity at 200 ° C. or lower is high due to the ionic cross-linking structure. Shows very good hot tack. In addition, ionomer has a hot tack strength of 5 times or more compared to low density polyethylene resin (LDPE), and is therefore suitable for automatic filling packaging that requires a peeling force immediately after sealing.

Easy peel layers (3a) and (3b) are composed of a metallocene polyethylene having a density of about 0.90 to 0.95 g / cm ³ ; 70 to 90% by weight, ethylene acid copolymer, ethylene acid copolymer ionomer, or mixtures thereof; About 30% by weight, and) about 2-1
Contains 0 wt% tackifier.

  For the easy peel layers (3a) and (3b), an easy peel sealant capable of changing the seal strength is used, and the seal temperature is adjusted. In addition, a complete seal region (A) is provided at a position opposite to the position of the lid material with respect to the position of the through hole (2) for the hot water cut hole provided in the lower laminate (4a) of the lid material by punching, and the flange portion of the lid material. Provided inside (8), for example, with an area of two-thirds of the lid. This completely sealed area (A) is thermally bonded (sealed) at a temperature of 170 ° C. or higher, and the other areas are sealed at a temperature of 150 ° C. or lower. Preferably, the completely sealed area (A) is thermally bonded (sealed) at 190 ° C., and the other areas are thermally bonded (sealed) at 140 ° C. Thereby, the peel strength of the complete seal region (A) is 20 to 40 N / 15 mm, and the peel strength of the other regions is 0.1 to 5.0 N / 15 mm. Thereby, it becomes possible to peel the upper laminated body (1a) and the lower laminated body (4a) in the region on the side of the through hole (2) which is a region other than the complete seal region (A). Thus, since the seal | sticker which changes a peel strength with an area | region was performed, the knob (6) for hot water hole formation protruded from the flange part (8) of the lid | cover material by the side of a through-hole (2) is pinched, and an upper laminated body (1a) is pulled up and peeled off from the lower laminate (4a) at the interface between the easy peel layers (3a) and (3b) at the face-to-face seal portion, so that hot water is cut into the container-side lower laminate (4a). A hole can be opened.

  Also, an upper laminate (1a) composed of a base material layer (1) and an easy peel layer (3a) of the lid, an easy peel layer (3b) on the container side, and a film (this film may be omitted) is also possible. ) And the lower laminate (4a) composed of the container-bonded easy peel layer (4), the easy peel layer is sealed in the following manner. That is, the sheet of the upper laminate (1a) in a roll state and the sheet of the lower laminate (4a) in a roll state are overlapped by bringing the easy peel layers (3a) and (3b) into contact with each other, and a seal cradle It is desirable to thermally bond (seal) the complete seal region (A) except for the region of the flange portion (8) of the lid. By using a seal cradle at the time of this sealing, it becomes possible to seal stably.

  The container-adhesive easy peel layer (4) is preferably excellent in low-temperature sealability, and preferably has no change in seal strength regardless of the change in seal temperature. Specifically, it is desirable to use a sealant having a peel strength of 5.0 N / 15 mm or more and less than 10 N / 15 mm at a peel temperature of 100 ° C. to 200 ° C. Among these, it is more desirable to use a sealant having a peel strength of 6.0 N / 15 mm or more.

  By using a sealant that satisfies this condition, the sealing strength between the flange (7) of the container and the flange portion (8) of the lid material is sufficient even when the sealing condition with the container is performed at a low temperature of 100 to 120 ° C. It is possible to produce a lid material that is sufficiently filled and has no problem in sealing performance.

  After filling the container with the contents, the container adhesive easy peel layer (4) of the lid material is thermally bonded (sealed) to the flange (7) of the container. The container may be filled with the contents and after the filling without any limitation.

The peeling property is not particularly limited, and any type of easy peel sealant of a cohesive peeling type, an interlayer peeling type, and an interfacial peeling type may be used. The cohesive peeling type is a type in which the sealing layer itself is broken and peeled off, and the sealing material remains on both the lid and the flange (7) of the container. There is a type using a polymer alloy (a general term for polymer systems in which two or more kinds of polymer chains having different characteristics coexist in one material). Many of them consist of two layers (support layer / peel layer) or three layers (support layer / peel layer / seal layer). With the delamination type, a film consisting of two or three layers is formed by coextrusion, the adhesive strength between the support layer and the sealing layer is lowered, and the lid and the flange (7) of the container are thermally bonded. When the lid is peeled off from the flange (7) of the container and opened, it is a type that is peeled off from the support layer and the sealing layer of the film. With the interface peeling type, an easily adhesive resin such as EVA is also used as an easy peel material. By increasing the vinyl acetate mixing ratio of EVA (ethylene-vinyl acetate copolymer resin), it is easy to melt by heat and easily adheres to anything. The film is adhered and the peel strength between the film and the container is adjusted.

  The easy peel sealant may contain tackifiers such as tackifiers, polymer antioxidants, lubricants and antistatic agents added to improve the slipperiness and chargeability of the film.

  Examples of the lamination method of the base material layer (1) of the paper base material or the plastic film and the easy peel layer (3a), the easy peel layer (3b) or the container adhesive easy peel layer (4) include, for example, a wet lamination method, a dry lamination method, and a dry lamination method. Known methods such as a lamination method, a non-solvent dry lamination method, a hot melt lamination method, an extrusion lamination method, and a sandwich lamination method using the extrusion lamination method can be used.

  As a method of providing a through hole (2) for a hot water cutting hole in the lower laminate (4a), first, the lower laminate (4a) is composed of an easy peel layer (3b) and a film (this film is omitted). And a container adhesion easy peel layer (4). Next, a method of opening a punch hole by pressing while pressing a blade processed into a die roll inline against the film, a method of opening a hole by pressing using a male type, a female type mold, Although there is a method of opening a hole by melting a film using a hot needle, any method may be used in the present invention.

Hereinafter, although the Example of this invention is described in detail, this invention is not limited to this Example.
<Example 1>
First, as the lower laminate (4a), as an easy peel layer (3b) on one side of a 12 μm thick biaxially stretched polyethylene terephthalate (OPET) film, High Milan NT07018 (thickness) manufactured by Mitsui DuPont Polychemical Co., Ltd. 30μm) is laminated by the dry lamination method, and SMXPY3000 (thickness 30μm) made by J Film Co., Ltd. is laminated on the other surface of the film as a container adhesion easy peel layer (4) by the dry lamination method. A lower laminate (4a) was obtained. Next, in the region of the lid material inside the lid part flange portion (8) of the lower laminate (4a), a round shape having a short side of 10 mm or less and a long side of 30 mm or less is obtained by punching. A through hole (2) for a hot water cutting hole having a square shape was formed.

As the upper laminate (1a), Daio Paper Co., Ltd., piece art 104.7 g / m ² with polyurethane adhesive, Mitsui DuPont Polychemical Co., Ltd., Himiran NT07018 (thickness 30 μm) is dried. Lamination was performed to obtain an upper laminate (1a).

  Next, from the roll, the upper laminate (1a) and the lower laminate (4a) are removed from the roll of the easy peel layer (3a) of the upper laminate (1a) and the surface of High Milan NT07018 of the lower laminate (4a). The peel layer (3b) was drawn out so as to be in contact with the surface of Hi-Milan NT07018. Next, using a seal cradle, the complete sealing region (A) of at least two-thirds of the area of the lid of the upper laminate (1a) and the lower laminate (4a) is sealed at 180 ° C., The laminated film which sealed the area | region (Easy peel area | region (B)) of the other side in which the through-hole (2) was formed at 140 degreeC, and heat-bonded the upper laminated body (1a) and the lower laminated body (4a). Formed.

  Next, the notch (2b) for knob formation was cut only in the lower laminated body (4a) from the SMPXY3000 side of the easy peel layer (4) of the lower laminated body (4a) to the laminated film. When the outer shape of the lid material is cut out by this knob forming cut (2b), the hot water cut hole forming knob (6) is separated from the main body of the lower laminate (4a), and the upper laminate (1a) It was designed to connect to the main body.

  Next, the flange portion (8) of the lid material of the container adhesive easy peel layer (4) of the laminated film of the lid material is brought into contact with the flange (7) of the container such as instant noodles or fragrance, and the lid material Then, the container was capped, and the flange portion (8) of the lid member was sealed and thermally bonded to the flange (7) of the container at 120 ° C. for 3 seconds at 1 kgf. The outer shape of the lid material which is punched at the same time as the seal, and has a lid opening knob (5) and a hot water hole forming knob (6) at the opposite electrode position of the lid material outside the flange portion (8) of the lid material Was cut out. An easy peel layer (3a) of the upper laminate (1a) is then applied by applying a force to pull up the hot water hole forming knob (6) of the lid material by the hot water hole forming knob (6) of the lid material. ) And the easy peel layer (3b) of the lower laminate (4a), and the upper laminate (1a) is separated from the lower laminate (4a) to remove the lower laminate (4a). The through hole (2) was exposed so that a hot water hole could be formed.

<Example 2>
For the easy peel layer (3a) and the easy peel layer (3b), 951TA (thickness 30 μm) manufactured by Toray Film Processing Co., Ltd. was used instead of HiMilan NT07018 of Example 1, and other than that of Example 1 In the same manner, a lid material was obtained.

<Comparative Example 1>
For the easy peel layer (3a) and the easy peel layer (3b), 9501E (thickness 30 μm) manufactured by Toray Film Processing Co., Ltd. was used instead of HiMilan NT07018 of Example 1, and other than that of Example 1 In the same manner, a lid material was obtained.

<Comparative example 2>
For the easy peel layer (3a) and the easy peel layer (3b), 7601C (thickness 30 μm) manufactured by Toray Film Processing Co., Ltd. was used instead of HiMilan NT07018 of Example 1, and other than that of Example 1 In the same manner, a lid material was obtained.

<Comparative Example 3>
For the easy peel layer (3a) and the easy peel layer (3b), 9501A (thickness 30 μm) manufactured by Toray Film Processing Co., Ltd. was used instead of HiMilan NT07018 of Example 1, and other than that of Example 1 In the same manner, a lid material was obtained.

  The main performance evaluation methods are described below. The peel strength of the lid materials of Examples 1 and 2 and Comparative Examples 1 and 2 and 3 was measured according to the standard of JIS-Z1707 using Tensilon (manufactured by A & D Co., Ltd .: RTF-1250) as a measuring instrument. did.

表１と図３に、実施例１と実施例２の蓋材のシール温度とピール強度の測定結果を示す。
実施例１：イージーピール領域（Ｂ）の低ピール強度と完全シール領域（Ａ）の高ピール強度の差が大きく、転移領域が広い為、シール条件設定が容易。
実施例２：イージーピール領域（Ｂ）の低ピール強度と完全シール領域（Ａ）の高ピール強度の差は大きいが、転移領域が狭い為、シール条件設定がやや困難。

Table 1 and FIG. 3 show the measurement results of the sealing temperature and peel strength of the lid materials of Example 1 and Example 2.
Example 1: Since the difference between the low peel strength in the easy peel region (B) and the high peel strength in the complete seal region (A) is large and the transition region is wide, setting of the sealing conditions is easy.
Example 2: Although the difference between the low peel strength in the easy peel region (B) and the high peel strength in the complete seal region (A) is large, setting the sealing conditions is somewhat difficult because the transition region is narrow.

In FIG. 4, the measurement result of the sealing temperature and peel strength of the cover material of the comparative example 1, the comparative example 2, and the comparative example 3 is shown.
Comparative Example 1: Since the transition temperature is not clear, there is a problem that it is difficult to set sealing conditions.
Comparative Example 2: Since the seal temperature region satisfying the low peel strength is narrow and is equal to the peel strength of the container-adhesive easy peel layer (4), the easy peel region ( B) has a problem that the peel strength is partially increased and it may be difficult to expose the through hole.
Comparative Example 3: Since the peel strength of the upper laminate (1a) and the lower laminate (4a) of the entire lid material is low, the upper laminate (1a) is peeled from the lower laminate (4a) and the lower laminate is laminated. When the through hole (2) of the body (4a) is exposed to form a hot water cutting hole, there is a problem that the complete seal region (A) other than the easy peel region (B) may be peeled off together. is there.

DESCRIPTION OF SYMBOLS 1 ... Base material layer 1a ... Upper side laminated body 2 ... Through-hole 2b for hot water cut-out holes ... Notch 3a for knob formation, 3b ... Easy peel layer 4 in which seal peeling is possible face-to-face -Container adhesion easy peel layer 4a-Lower laminated body 5-Opening knob 6-Hot water hole forming knob 7-Container flange 8-Cover flange A ..Complete seal area B ... Easy peel area

Claims (5)

  At least one base material layer (1) of a paper base material or a plastic film, an upper laminate (1a) composed of an easy peel layer (3a) that can be peeled off face to face, an easy peel layer (3b), The lower laminated body (4a) consisting of the container adhesion easy peel layer (4) formed via the second base material layer or directly is formed of a laminated film laminated in this order from the outside, and the container flange ( 7) A lid member having an opening knob (5) projecting outward from the flange portion (8) of the lid material to be thermally bonded to 7), wherein the complete seal is formed inside the flange portion (8) of the lid member. In the region (A), the upper laminate (1a) and the lower laminate (4a) are sealed, and the lower laminate (4a) in the region other than the seal region (A) has a flange portion ( Within the position of 8) Functional lid, characterized in that it has a through hole for hot cutting hole (2) in the region.   The easy peel layer (3a) and the easy peel layer (3b) have a low peel strength (0.1 to 5.0 N / 15 mm) and a high peel strength (20 to 40 N / 15 mm) transition temperature of 150 ° C. to 170 ° C. The functional lid material according to claim 1, wherein:   The functional lid material according to claim 1 or 2, wherein the container adhesion easy peel layer (4) has a peel strength of 5 to 10 N / 15 mm at a seal temperature of 100 to 200 ° C.   In the functional lid | cover material as described in any one of Claims 1 thru | or 3, The knob for hot-water hole formation which does not connect to the main body of the said lower laminated body (4a) connected to the said upper laminated body (1a) ( 6) is formed so as to protrude outward from the lid portion flange portion (8) at the counter electrode position of the lid member from the lid opening knob (5).   An easy peel layer (3a) and an easy peel layer (3b) having a transition temperature of 150 ° C. to 170 ° C. between a low peel strength (0.1 to 5.0 N / 15 mm) and a high peel strength (20 to 40 N / 15 mm). A step of producing the upper laminate (1a) by laminating the easy peel layer (3a) on at least one substrate layer (1) of a paper substrate or a plastic film, and the easy peel A step of producing a lower laminate (4a) in which the container-adhesive easy peel layer (4) is laminated on the layer (3b) via the second base material layer or directly; and the lower laminate (4a) Forming a through hole (2) for hot water cutting holes in a region inside the position of the flange portion (8) to be thermally bonded to the flange (7) of the container, and the above-mentioned upper laminate (1a) Easy peel layer (3a And the easy peel layer (3b) of the lower laminate (4a) are brought into contact with each other, and the complete seal region (A) inside the flange portion (8) of the lid member is 170 ° C. or higher. And a step of sealing the other region at a temperature of 150 ° C. or lower.

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