JP2015048095A - Container sealing structure, and inner seal material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container seal structure capable of releasing a sealed state made by an inner seal material joined to a mouth of a container, only by removing a cap member, capable of sealing the mouth again, by reattaching the cap member, and capable of avoiding falling of an inner seal from a cap by devising an insertion method into the cap, and to provide the inner seal material to be used for the same.SOLUTION: In a container sealing structure, an inner seal material comprises: an upper sheet material one surface of which is joined and fixed to a cap member and which is provided with a metal foil layer as a barrier layer; and a lower sheet material which is not equipped with the barrier layer. The inner seal material is formed so as to be cut off to an outside part and an inside part on the boundary of a cutoff line part engraved along a closed curve pattern in an area inside an inner periphery of a mouth of a container, and the cutoff line part is engraved at least with depth not penetrating the barrier layer of the upper sheet material.

Description

  The present invention relates to a container sealing structure and an inner seal material. For example, the present invention relates to a container sealing structure that seals a container by attaching a lid member having an inner seal material to the mouth of the container, and an inner seal material used therefor.

  Conventionally, for example, as a means for sealing a mouth portion of a container containing a highly hygroscopic content such as coffee, a sealing inner has been provided with a reseal layer on the inside of the lid member and the mouth portion of the container is sealed. It is known to bond a sealing material.

  When sealing a container with such a sealing inner seal material, the sealing inner seal material is peelably laminated on the reseal layer of the lid member, and the lid member is sealed in such a state that the lid member is tightened into the container. The inner seal material for the container and the mouth of the container are joined.

  When the lid member is removed during use, the reseal layer is peeled off from the sealing inner seal material and removed together with the lid member, and the sealing inner seal material remains in the mouth. For this reason, the user opens the inner sealing material for sealing and takes out the contents. After part or all of the sealing inner seal material is removed, the lid member is tightened again, and the container is sealed by the close contact between the reseal layer and the mouth.

  In such a container sealing structure, since the inner sealing material for sealing is firmly attached to the mouth portion, there is a problem that it is difficult to open and it is difficult to open cleanly leaving a necessary opening.

  In order to solve such a problem, for example, in Patent Document 1, after removing the cap (lid member), it is easy to open the inner seal material for sealing the container mouth portion. By providing a partial release layer in the middle part of the inner surface, a state is formed in which the inner surface layer is in close contact with the mouth portion and the outer surface layer is peeled off in a half-moon shape that is easy for a user to pick Describes an inner seal material for sealing a container mouth that can be opened by picking an outer surface layer and pulling it upward.

  Japanese Patent Application No. 2012-036696 discloses a sealing state with an inner seal material joined to the mouth of the container when the cap is removed by providing a cut-off line with a depth that penetrates the lower sheet material in a closed curve shape. Can be opened simply by removing the lid member, and a container sealing inner seal material is described in which the mouth portion can be sealed again by reattaching the lid member.

JP 2000-159261 A

The prior art as described above has the following problems.
In the technique described in Patent Document 1, after removing the cap, the user grips the outer surface layer separated from the inner surface layer and pulls it upward, so that the inner surface layer is torn from the edge of the release layer and opened. However, the method of pulling the outer surface layer varies depending on the user.

  For this reason, depending on the pulling direction of the outer surface layer, how to apply force, etc., there is a problem that the unsealed state varies, for example, it cannot be opened cleanly from the edge of the release layer. In addition, depending on the pulling method, the inner sealing material for sealing the container opening may be divided into two in the thickness direction and may not be opened.

  Moreover, in the technique described in Japanese Patent Application No. 2012-036696, there is a problem that it is difficult to take out the contents because the lower material outside the closed curve remains in the flange portion of the container. In addition, in order to achieve the desired opening, in addition to the fitting strength with the cap and the adhesive strength between the upper and lower sheets, the appropriate strength setting of the bonding strength with the container, the breaking strength of the non-fragile part of the separation line, Appropriate design of the adhesive strength between the upper and lower sheets inside the closed curve is necessary and difficult to realize.

Also in the technique disclosed in Patent Document 1, the opening operation includes a two-step operation, that is, an operation of removing the lid member and an operation of peeling the inner seal for sealing the container mouth, as in the conventional case. As described above, when the opening operation is performed in two steps, there is a problem that it takes time and effort to open.
In addition, in the upper and lower separation type inner seal material, the so-called “dropping” in which the entire inner seal layer is detached from the fitting portion inside the cap may occur as a poor quality due to the mismatch of the cap dimension and the inner seal material dimensional accuracy. . As a recycling method, the upper sheet is peeled off from the entire inner seal layer transferred to the container side, and the cap is fitted into the cap and the cap is tightened. However, in the technique of Patent Document 2, when the upper sheet is peeled off from the lower sheet, the hermeticity inside the container cannot be maintained, and the product cannot be regenerated when the “dropping” quality defect occurs. .

  The present invention has been made in view of the above problems, and the sealed state by the inner seal material joined to the mouth of the container can be released simply by removing the lid member. A container sealing structure that can re-seal the mouth part by mounting, and can prevent the inner seal from coming off the cap by devising a method of inserting into the cap, and an inner seal material used therefor The purpose is to provide.

  In order to solve the above-mentioned problem, in the invention according to claim 1, a container sealing structure in which a lid member having an inner seal material is attached to a mouth portion of the container to seal the container, the inner seal material is provided. One surface is fitted to the lid member or bonded and fixed to the lid member by in-mold molding, and the container is provided on the outer side of the surface opposite to the upper sheet material, with the upper sheet material having a metal foil layer as a barrier layer. A lower sheet material that is bonded to the mouth portion of the upper sheet material and does not have a barrier layer. In the area inside the inner periphery of the part, it is formed to be separable into an outer part and an inner part with a separation line part engraved along a closed curve pattern as a boundary, and the separation line part is a carbon dioxide laser processing machine Formed by Beginning from the sheet, it passes through the bonding interface of the upper and lower sheet material, a container sealing structure, wherein a separation line portion at a depth that does not penetrate the barrier layer of at least the upper sheet material is engraved.

  According to a second aspect of the present invention, in the container sealing structure according to the first aspect, the separation line portion is processed by a continuous line.

In the invention according to claim 3, in the surface layer portion on the upper sheet material side in the lower sheet material, the adhesive between the upper sheet material and the adhesiveness between the upper sheet material and the adhesive is lower. A release layer formed by pattern-coating the release agent, and a sheet-like coating substrate that supports the release layer from the lower sheet side are provided, and a pattern coating of an adhesive and the release agent is provided. 2. The bonding strength between the outer portion and the upper sheet material is made smaller than the bonding strength between the inner portion and the upper sheet material by changing the work pattern between the outer portion and the inner portion. Or it is the container sealing structure of 2.

  The invention according to claim 4 is the container sealing structure according to any one of claims 1 to 3, wherein the breaking strength of the separation line portion is 2 N / 15 mm or less.

  In invention of Claim 5, in the container sealing structure of any one of Claims 1-4, in order to seal the opening part of a container, it is the inner member fixed and used for the cover part and the opening part of a container The inner seal material is laminated on the upper sheet material, one surface of which is fitted to the lid member or bonded and fixed to the lid member by in-mold molding, and the other surface of the upper sheet material. A lower sheet material that is bonded to the sheet material and can be bonded to the mouth portion at the outer side of the surface opposite to the upper sheet material, and the lower sheet material is a surface in contact with the top surface of the lid member of the upper sheet material; Are peelably bonded to different surfaces, and the separation line portion is engraved at a depth that starts from the lower sheet, passes through the bonding interface of the upper and lower sheet materials, and does not penetrate at least the barrier layer of the upper sheet material Inner characterized by Over a sealing material.

  According to the container sealing structure and the inner seal material according to claims 1 to 5 of the present invention, the lid member can be removed to release the sealed state, and at the same time, a resealable opening can automatically appear. It becomes possible.

It is typical sectional drawing which shows schematic structure at the time of sealing of the container sealing structure of the 1st Embodiment of this invention, and opening. It is typical sectional drawing along the lamination direction which shows schematic structure of the inner seal material used for the container sealing structure of the 1st Embodiment of this invention, and typical sectional drawing of the direction orthogonal to a lamination direction. (a) is a typical top view which shows the surface of the mold release layer in the container sealing structure of the 1st Embodiment of this invention, (b) is the A section enlarged view, (c) is the A section enlarged view It is BB sectional drawing of. It is a flowchart which shows the process flow of the manufacturing method of the inner seal material of the 1st Embodiment of this invention. It is typical sectional drawing along the lamination direction which shows schematic structure of the inner seal material used for the container sealing structure of the 2nd modification of the 1st Embodiment of this invention. It is typical sectional drawing of the direction orthogonal to the lamination direction of the inner seal material used for the container sealing structure of the 4th modification of the 1st Embodiment of this invention. It is typical sectional drawing of the direction orthogonal to the lamination direction of the inner seal material used for the container sealing structure of the 5th modification of the 1st Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In all the drawings, even if the embodiments are different, the same or corresponding members are denoted by the same reference numerals, and common description is omitted.

[First Embodiment]
The container sealing structure and inner seal material of the first embodiment of the present invention will be described.
FIG. 1A and FIG. 1B are schematic cross-sectional views showing a schematic configuration at the time of sealing and opening of the container sealing structure of the first embodiment of the present invention. 2A and 2B are schematic cross-sectional views along the stacking direction showing the schematic configuration of the inner seal material used in the container sealing structure according to the first embodiment of the present invention, and orthogonal to the stacking direction. It is typical sectional drawing of the direction to do. FIG. 3A is a schematic plan view showing the surface of the release layer in the container sealing structure according to the first embodiment of the present invention. FIG.3 (b) is the A section enlarged view in Fig.3 (a). FIG.3 (c) is BB sectional drawing in FIG.3 (b).

As shown in FIG. 1A, the container sealing structure of this embodiment is a structure in which a lid 1 having an inner seal material 5 is attached to a mouth 1a of a bottle 1 (container) and the bottle 1 is sealed. It is.
In the following, in order to simplify the direction reference, unless otherwise specified, as shown in FIGS. 1A and 1B, the mouth portion 1a of the bottle 1 is arranged vertically upward and the lid member 2 is placed in the mouth portion. It is described as being mounted from the upper side to the lower side of 1a, and based on the vertical relationship in such an arrangement, the relative positional relationship of each member is set to the upper (lower) side, upper (lower) side, upper side. Sometimes referred to as (lower) layer, upper (lower) surface, or the like.

The bottle 1 is a container for storing the contents therein, and is provided with a mouth portion 1a for mounting the lid member 2 in at least one place. The shape of the bottle 1 can employ | adopt an appropriate shape and material according to the contents.
For example, when storing contents such as instant coffee, the bottle body (not shown) can be exemplified by a bottomed cylindrical body made of glass. As the outer shape of the bottle main body, a suitable shape such as a polygonal or circular cylinder, a sphere, a rectangular parallelepiped or the like can be adopted.
Further, the bottle main body and the mouth portion 1a may be made of different materials.

In the present embodiment, as an example, the bottle 1 is formed of a glass molded body, and the mouth portion 1a is described as an example of a cylindrical body having a substantially constant thickness protruding from the bottle body.
For this reason, the mouth portion 1a has an outer peripheral surface 1e and an inner peripheral surface 1f formed in a coaxial cylindrical shape, and an end portion of the mouth portion 1a has a mouth between the outer peripheral surface 1e and the inner peripheral surface 1f. A front end face 1d of the mouth aligned on a plane orthogonal to the central axis of the part 1a is formed.
1 (a) and 1 (b) are schematic views, and the front end surface 1d of the mouth is drawn as a plane in contact with the outer peripheral surface 1e and the inner peripheral surface 1f, but the outer peripheral surface 1e and the inner peripheral surface 1f Further, a corner portion that is rounded or has an inclined surface may be formed between the mouth tip end surface 1d.
Further, the radial width of the mouth end surface 1d can be set to an appropriate width as long as the inner seal material 5 can be joined.
The outer peripheral surface 1e is formed with a plurality of screwing projections 1b that protrudes outward in the radial direction and is arranged along a spiral curve that spirals along the central axis of the outer peripheral surface 1e.

The lid member 2 is a member that is detachably attached to the mouth portion 1a of the bottle 1 and covers the mouth portion 1a.
In the present embodiment, the lid member 2 has a bottomed cylindrical outer shape that can be externally fitted to the mouth portion 1a, and an inner peripheral surface having a larger diameter than the outer peripheral surface 1e of the mouth portion 1a at the inner peripheral portion. 2b and a circular inner top surface 2a covering the mouth tip surface 1d of the mouth 1a are formed.
The inner peripheral surface 2b is provided with a holding projection 2d that holds the inner seal material 5 facing the inner top surface 2a, and a screw projection 2c that can be screwed with the screw projection 1b of the mouth 1a. ing.
The holding projection 2d can be provided in an appropriate position and shape as long as it can hold the outer peripheral portion of the upper sheet material 4 described later of the inner seal material 5 when the lid member 2 is removed and opened. In this embodiment, as an example, it is provided over the entire circumference of the inner peripheral surface 2b at a position away from the inner top surface 2a than the thickness dimension of the inner seal material 5, and the cross-sectional shape is triangular.
The material of the lid member 2 is not particularly limited, and for example, synthetic resin or metal can be used.

The inner seal material 5 is a laminated body in which an upper sheet material 4 and a lower sheet material 3 are laminated as shown in FIG. The outer shape of the inner seal member 5 in plan view is a circle having a smaller diameter than the inner top surface 2a, a larger diameter than the inner diameter of the holding projection 2d, and a larger diameter than the outer shape of the outer peripheral surface 1e of the mouth 1a. .
In the container sealing structure of the present embodiment, the upper sheet material 4 includes a paper layer 4a (see FIG. 2A), which constitutes the upper surface 4A, which is one surface in the thickness direction, and the inner top of the lid member 2. It arrange | positions facing the surface 2a, and is joined with the upper surface 3A of the lower sheet | seat material 3 in the lower surface 4B which is the other surface of the thickness direction so that peeling is possible.
In the sealed state shown in FIG. 1A, the inner top surface 2a and the upper surface 4A are in close contact with each other, but are not fixed. For this reason, the inner sealing material 5 is the inner top surface 2a in the state (not shown) fitted to the lid member 2 before sealing, or in the opened state shown in FIG. 1 (b). It is possible to move within a range allowed by the gap between the projection 2d and the holding projection 2d. For example, the lid 2 can be rotated.
Further, the lower sheet material 3 is fixed to the front end surface 1d of the mouth 1a on the outer peripheral side of the lower surface 3B.

As shown in FIG. 2A, the upper sheet material 4 has a paper layer 4a, an adhesive layer 4b, a barrier layer 4c, an adhesive layer 4d, a base material layer 4f, and a resin layer 4e from the upper surface 4A toward the lower surface 4B. Is a laminated body laminated in this order.
For this reason, the paper layer 4 a constitutes the uppermost layer of the upper sheet material 4, and the resin layer 4 e constitutes the lowermost layer of the upper sheet material 4. In the upper sheet material 4, layers other than the paper layer 4 a and the resin layer 4 e constitute an intermediate layer of the upper sheet material 4.

The paper layer 4a is a paper sheet-like member whose one surface constitutes the upper surface 4A of the upper sheet material 4. When the lid member 2 is removed and opened, the paper layer 4a is bent or bent, thereby holding the projection. It is made of cardboard having a rigidity that does not slip through the portion 2d.
As such a paper layer 4a, a thick paper having a basis weight of 100 g / m ² or more and 800 g / m ² or less is suitable.
When the basis weight is less than 100 g / m ² , the rigidity of the paper layer 4 a is small, and therefore, when removing the lid member 2, it is easily deformed by the external force received, and the force that peels the lower sheet material 3 from the upper sheet material 4. And since it becomes difficult to transmit the force which cuts off the separation line part 6 mentioned later, it becomes difficult to open. Moreover, even when it can be opened, peeling and separation are insufficient, so that it cannot be separated cleanly, and so-called repackability is deteriorated.
When the basis weight exceeds 800 g / m ² , since the thickness is excessive, the waist becomes stiff and the lid member 2 cannot be loaded.
In addition, it is preferable to set the paper layer 4a to a range narrower than the above-described basis weight range, since the opening becomes easier and the loading into the lid member 2 becomes easier. For example, the paper layer 4a is more preferably a paperboard having a basis weight of 300 g or more and 650 g or less.

  As a method of fixing the inner seal material 5 to the lid member 2, an in-mold molding method can be used in addition to the above loading method. Since the inner seal material 5 is inserted into a mold for molding the lid member 2 in advance and the lid member 2 is molded, the upper surface and side surfaces of the inner seal material 5 are bonded to the lid member 2. The holding protrusion 2d is not required, the rigidity of the paper layer 4a of the upper sheet material 4 is not required, and the upper and lower sheet materials are not separated at the time of opening, and the defect that the inner seal material 5 falls off from the lid member 2 hardly occurs. There is an advantage.

The adhesive layer 4b is a layered portion for adhering and fixing the paper layer 4a and a barrier layer 4c, which will be described later, and is an adhesive that does not cause separation between the barrier layer 4c and the paper layer 4a due to an external force acting at the time of opening. It is formed using an appropriate adhesive that can provide strength.
Examples of adhesive resins suitable for the adhesive layer 4b include, for example, polyolefins such as polyethylene and polypropylene, ethylene-methacrylic acid copolymers, ethylene-vinyl acetate copolymers, acid copolymer resins such as ionomers, and ethylene-propylene. Examples thereof include resins such as copolymers and saponified ethylene-vinyl acetate copolymers. In addition, one or more of these constituent materials can be used in combination.
The thickness of the adhesive layer 4d is preferably 10 μm or more. The upper limit value of the thickness of the adhesive layer 4d may be in a range that satisfies the required adhesive strength and meets the packaging material cost, but may be set as appropriate with an upper limit value of 30 μm. preferable.
As an example of an adhesive suitable for the adhesive layer 4b, for example, a composition in which paraffin is mainly used and an ethylene-vinyl acetate copolymer, polyisobutylene, or the like is added can be given.
In addition, when the paper layer 4a is a highly rigid paperboard having a basis weight exceeding 500 g / m ² and the laminate is formed by laminating the paper layer 4a, the laminate is wound after the lamination. Since it is difficult to take, it is necessary to cut into a sheet shape in-line in the lamination process. For this reason, it is preferable to use an extruded resin adhesive, a quick-drying wax adhesive, or a hot melt adhesive as the adhesive layer 4b in consideration of the workability of lamination and cutting.

The barrier layer 4 c is a sheet-like member provided in the upper sheet material 4 to suppress moisture permeation.
The configuration of the barrier layer 4c is not particularly limited as long as moisture permeation can be suppressed. For example, a metal foil, a sheet-like member obtained by coating a synthetic resin film with an inorganic material, or the like can be employed.
As an example of metal foil, aluminum foil, iron foil, copper foil, tin foil, etc. can be mentioned, for example.
Examples of synthetic resin films include polyethylene terephthalate (PET) resin, polyethylene naphthalate resin, polyamide resin, polyethylene (PE) resin, polypropylene (PP) resin, polyvinyl chloride resin, polycarbonate resin, polyvinyl alcohol resin, and ethylene-propylene. Examples thereof include films such as copolymer resins, ethylene-vinyl acetate copolymer (EVA) resins, and polyvinylidene chloride resins.
Examples of the coating material for these synthetic resin films include inorganic substances and inorganic compounds such as aluminum, aluminum oxide, indium oxide, magnesium oxide, zinc oxide, tin oxide, and zirconium oxide.
Examples of the coating means for these inorganic substances and inorganic compounds include vapor deposition.
However, when the cut line portion 6 to be described later is formed by carbon dioxide laser processing, the laser light is reflected by the metal, and therefore it is necessary to use a metal foil that can be opened and guided while maintaining barrier properties.
In addition, considering that the curling occurs after the outer shape of the inner seal material 5 is punched, the handling ability such as the suitability for stacking and the loading is impaired, and a metal foil that can correct the curling is suitable, and the cost is taken into consideration. Aluminum foil is the best.
Furthermore, in addition to moisture, the aluminum foil has a high gas barrier property that also causes odor. The aluminum foil is also suitable for high-frequency sealing of the inner seal material 5 because eddy currents are easily generated.

  The adhesive layer 4d is a layered portion for adhering and fixing the barrier layer 4c and a base material layer 4f to be described later, and peeling between the base material layer and the barrier layer 4c does not occur due to an external force acting at the time of opening. It is formed of an appropriate adhesive resin that can provide adhesive strength. As the type of the adhesive layer 4d, an appropriate adhesive can be adopted depending on the material of the barrier layer 4c and a base material layer described later. Examples of suitable adhesives include, for example, urethane adhesives that are dry laminate adhesives, extruded PE, and urethane adhesives that are non-solvent adhesives.

The base material layer 4f is a layered portion laminated between the barrier layer 4c and a resin layer 4e described later via an adhesive layer 4d, and the base material strength is set so that the barrier layer 4c is not torn off by an external force acting at the time of opening. Give. As a sheet material member suitable for the base material layer 4f, the synthetic resin film described in the barrier layer 4c can be adopted, but an axially stretched PET film is preferably used in terms of base material strength, processability, and cost. Can do. Moreover, the stacking order of the base material layer 4f and the barrier layer 4c can be changed, and the adhesive layer 4d and the base material layer 4f may be omitted depending on the adhesive strength between the upper and lower sheet materials or the separation strength of the separation portion 6. Is also possible.
The resin layer 4e is a layered portion that constitutes the lower surface 4B of the upper sheet material 4 and is detachably joined to the lower sheet material 3.
As the resin material used for the resin layer 4e, a resin material that can be bonded to the base material layer can be adopted. Therefore, the resin layer 4e may use the same resin material as that of the adhesive layer 4b. Also, ozone treatment or anchor coating can be used for the purpose of improving the adhesive strength on the base material layer side. Further, the thickness of the resin layer 4e can be appropriately set from the same thickness range as that of the adhesive layer 4d.

As shown in FIG. 2A, the lower sheet material 3 has a release layer 3a, a coating substrate layer 3b, an adhesive layer 3c, a sheet substrate layer 3d, an ink layer from the upper surface 3A toward the lower surface 3B. 3e, the resin layer 3f, and the sealant layer 3g are laminated bodies laminated in this order.
Therefore, the release layer 3 a constitutes the uppermost layer of the lower sheet material 3, and the sealant layer 3 g constitutes the lowermost layer of the lower sheet material 3. In the lower sheet material 3, layers other than the release layer 3 a and the sealant layer 3 g constitute an intermediate layer of the lower sheet material 3.

Further, in the present embodiment, the separation line portion 6 is engraved through each layer of the lower sheet material 3 excluding the sealant layer 3g along the closed curve pattern in a region inside the inner periphery of the mouth portion 1a. .
The closed curved line pattern along which the separation line portion 6 follows can be appropriately set according to the shape of the opening to be formed in the lower sheet material 3 at the time of opening, but in this embodiment, as shown in FIG. 2B as an example. Furthermore, a concentric circle having a diameter d with respect to the outer circle of the lower sheet material 3 is used.
On the concentric circle, the separation line portion 6 is formed by alternately penetrating portions 6a penetrating in the thickness direction at a circumferential length La and non-etched portions 6b having a length Lb in the circumferential direction alternately. It is formed and has a broken line shape as a whole.
In this embodiment, the diameter d of the concentric circle with which the separating line portion 6 is aligned is smaller than the inner diameter of the inner peripheral surface 1f of the mouth portion 1a.

By such a parting line part 6, the lower sheet material 3 is divided into two regions, an outer part 3C and an inner part 3D, with the parting line part 6 as a boundary, and on the lowermost surface, the parting line part is formed as described later. A sealant layer 3g having a shear strength lower than that of 6 is laminated.
For this reason, in the lower sheet material 3, when an external force exceeding the separation strength acts on the separation line portion 6 by applying different external forces to the outer side portion 3C and the inner side portion 3D, the separation line portion 6 is separated. .
The separation strength of the separation line portion 6 is smaller than the bonding strength between the inner portion 3D and the upper sheet material 4 and the bonding strength between the outer portion 3C and the mouth portion 1a by appropriately setting the lengths La and Lb. Keep it.
In particular, the length Lb is preferably 0.2 mm or more and 3 mm or less.
If the length Lb is less than 0.2 mm, the separation strength is too small, so the non-engraved portion 6b is broken in the intermediate process until the inner seal material 5 such as handling after engraving or after engraving. It becomes easy.
On the other hand, if the length Lb exceeds 3 mm, the separation strength increases, so that the force required for opening increases, which may make it difficult to open.
Moreover, it is preferable that Lb is the length below La.

The parting line part 6 can also be formed by a continuous line having penetrating parts 6a all around. By making the separation line 6 a continuous line, it is not necessary to separate the non-etched portion at the time of opening, so that the adhesive strength of the release layer 3a can be reduced, and the opening suitability can be improved.
As shown in FIGS. 3A, 3B, and 3C, the release layer 3a includes an adhesive 3a1 that adheres to the lower surface 4B of the upper sheet material 4, and the upper sheet material 4 compared to the adhesive 3a1. It is a layered part formed by pattern coating the release agent 3a2 having a low adhesiveness.
In the present embodiment, the release layer 3a is applied by patterning the adhesive 3a1 on the release agent 3a2 applied so as to be laminated on the entire upper surface of the sheet-like coating base material layer 3b. Yes.
The coating pattern of the adhesive 3a1 employs different patterns PD and PC in order to change the bonding strength to the upper sheet material 4 between the inner portion 3D and the outer portion 3C.

The pattern PD has a bonding strength that does not cause separation between the lower surface 4B of the upper sheet material 4 and the upper surface 3A of the inner portion 3D even by an external force such as a tensile force or a shearing force that acts on the inner portion 3D at the time of opening. In addition, it is set so that the bonding strength of the inner portion 3D can be increased compared to the outer portion 3C.
For this reason, although it depends on the magnitude of the adhesive force of the adhesive 3a1 to the lower surface 4B, it is preferable to apply a solid coating over a wide range in the inner portion 3D.
In the present embodiment, the pattern PD is a pattern in which the adhesive 3a1 is solidly applied to a circular area excluding an annular area having a width LD inside from the separation line portion 6. For this reason, the release agent 3a2 having an annular shape in plan view is exposed on the outer periphery of the adhesive 3a1.
The width LD of the pattern PD 1 can be set to an appropriate size as long as the adhesive 3a1 does not cover the separation line portion 6 and the bonding strength between the lower surface 4B and the adhesive 3a1 is equal to or higher than the required strength. .

The pattern PC has a bonding strength that allows the lower surface 4B of the upper sheet material 4 and the upper surface 3A of the outer portion 3C to be easily peeled by an external force such as a tensile force or a shearing force that acts on the outer portion 3C when opened. Set. Therefore, it is necessary that the bonding strength by the pattern PC is smaller than the bonding strength by the pattern PD and smaller than the bonding strength between the mouth end surface 1d and the lower surface 3B of the outer portion 3C described later.
In the present embodiment, the pattern PC is within the outer portion 3C, a pattern was applied by arranging the dot-like adhesive 3a1 diameter D ₁ in a grid arrangement pitch L _C. For this reason, the release agent 3a2 is exposed between the dot-like adhesives 3a1.
Thus, the bonding strength with respect to the upper sheet 4 at the outer portion 3C, by setting the arrangement pitch Lc and diameter D ₁ into an appropriate size, the area ratio of the adhesive 3a1 at the outer portion 3C and the release agent 3a2 The bonding strength can be made appropriate.

Examples of the release agent 3a2 include nitrocellulose resins, polyamide resins, acrylic resins, rubber resins, polyester resins, polyurethane resins, vinyl chloride-vinyl acetate copolymer resins, or two or more of these. Mixtures containing can be employed.
Further, as the release agent 3a2, a composition in which a silicone resin is added to the single resin or the mixture is also suitable.
Any of the resins suitable as the release agent 3a2 as described above has low affinity with polyethylene. For this reason, for example, when a polyethylene layer is laminated on the surface of the release agent 3a2 by melt extrusion, the adhesive strength between the release agent 3a2 and the polyethylene layer becomes 0.1 N / 15 mm width to 1.0 N / 15 mm width.
In the present embodiment, the width of the outer portion 3C is about the same as the width of the mouth end surface 1d, and is about 3 mm to 10 mm, for example. The release agent 3a2 and the polyethylene layer are peeled off very easily.

As the adhesive 3a1, any suitable material can be adopted as long as it can be applied onto the release agent 3a2 and can be joined to the release agent 3a2. In the present embodiment, a resin having heat sealability is employed as an example.
Examples of such a resin having heat sealability preferable as the adhesive 3a1 include, for example, a simple substance such as urethane resin, vinyl chloroacetate resin, chlorinated PP resin, chlorinated EVA resin, modified PE resin, or the like. Mention may be made of mixtures containing more than one type.
Any of the resins suitable as the adhesive 3a1 as described above has a strong affinity for polyethylene. For this reason, for example, when a polyethylene layer is laminated on the surface of the adhesive 3a1 by melt extrusion, the adhesive 3a1 and the polyethylene layer are bonded with higher strength than the release agent 3a2.

  The release layer 3a having such a configuration can be formed by printing a release agent 3a2 and an adhesive 3a1 on the coating substrate layer 3b.

As explained above, for example, as the resin layer 4e of the upper sheet material 4, if a resin such as polyethylene having a weak affinity for the release agent 3a2 is adopted and laminated on the release agent 3a2 by melt extrusion, low With strong joint strength, they can be bonded together and easily peeled off.
Accordingly, the outer portion 3C can be configured to have only the release agent 3a2.
However, if the bonding strength is increased to a level that does not hinder the opening by applying the pattern of the adhesive 3a1 as in the present embodiment, for example, in the manufacturing process of the inner seal material 5, the lower sheet material 3 And when external force acts by the operation | work after joining of the upper sheet | seat material 4, handling, loading to the cover member 2, etc., it can prevent that the outer side part 3C and the upper sheet | seat material 4 peel or drown. For this reason, the work efficiency in a manufacturing process can be improved and the defect rate can be reduced.

The coating substrate layer 3b is a sheet-like member that supports the release layer 3a, and is a member that can be applied to the release layer 3a so as not to peel off, and a separation line is formed by laser processing. From the necessity to do, it is limited to PET film and nylon film. If necessary, these substrates can be multilayered with an adhesive.
Examples of the surface treatment include easy adhesion treatment for improving the adhesion of the pattern ink, gloss varnish treatment for improving the metallic luster, and the like.
Examples of the type of coating include coating with OP varnish for improving gloss and protecting the ink surface.
In the present embodiment, since the release agent 3a2 is solid-coated on the coating base material layer 3b, the sheet base material layer 3d only needs to have a surface to which the release agent 3a2 can adhere.
Further, the lower surface (surface on the adhesive layer 3c side) of the coating base material layer 3b can be subjected to appropriate surface treatment or coating for improving the bonding strength with the adhesive layer 3c.

In addition, an appropriate pattern may be printed on at least one of the upper surface and the lower surface of the sheet base material layer 3d using an ink that can be printed on the sheet base material layer 3d.
In the present embodiment, the pattern printed on the upper surface of the sheet base material layer 3d is a pattern that can be viewed from the upper surface 3A side of the outer portion 3C when opened, and the pattern printed on the lower surface of the sheet base material 3d is The pattern can be seen from the lower surface 3B side of the inner part 3D remaining on the lid member 2 at the time of opening.

  As the kind of the adhesive layer 3c, an appropriate adhesive can be adopted according to the material of the coating base material layer 3b and the sheet base material layer 3d. Examples of suitable adhesives include, for example, urethane adhesives that are dry laminate adhesives, extruded PE, and urethane adhesives that are non-solvent adhesives.

The ink layer 3e is for forming a picture layer visible from the lower surface on the sheet base material layer 3d, and is formed by printing an appropriate picture using ink that can be printed on the surface of the sheet base material layer 3d. The
Examples of the pattern by the ink layer 3e include a decorative pattern formed at a position finally visible from the lower surface 3B side of the lower sheet material 3 and a pattern for a manufacturing process.
As a pattern for the manufacturing process, for example, a register mark for automatically identifying the position when the cut line portion 6 is engraved, or a punching position when the outer shape of the inner seal material 5 is formed by punching An example of a tracking eye mark for identifying the can be given. These patterns for the manufacturing process can be finally printed outside the region included in the lower sheet material 3. Regarding the stacking order, the sheet base layer 3d can be stacked on the intermediate layer in the case of the upper surface, the lower surface, and the multilayer.
Further, the ink layer 3e may be omitted when a pattern is not necessary.

The resin layer 3f is a layered portion that protects the lower surfaces of the sheet base material layer 3d and the resin layer 3f by covering and bonding the lower surface sides of the sheet base material layer 3d and the ink layer 3e. In addition, it is formed of an appropriate adhesive resin that can obtain a bonding strength that does not cause peeling from the sheet base material layer 3d.
In the present embodiment, the resin layer 3f can employ the same resin material as the adhesive layer 4d and the resin layer 4e. Similarly, a technique for improving the adhesive strength by ozone treatment or anchor coating treatment can be used.
In addition, if a material having lower rigidity than the sheet base material layer 3d is used as the resin material of the resin layer 3f, the sheet base material layer 3d can be covered with a layered portion having appropriate elasticity. When the inner seal material 5 is pressed against the mouth 1a, cushioning properties can be imparted and sealing properties can be obtained. For example, when a PET resin film is employed as the sheet base material layer 3d, a suitable cushioning property can be imparted by employing a PE resin extruded layer as the resin layer 3f.

The sealant layer 3g is a layered portion made of a thermoplastic resin for joining the lower sheet material 3 to the mouth portion 1a of the bottle 1, and can be melted by heat and fused to the end portion of the mouth portion 1a. An appropriate resin material can be employed. For example, an appropriate hot melt agent or heat sealant can be employed. In addition, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene- A film layer in which a resin such as methyl acrylate copolymer, ethylene-methacrylic acid copolymer, or ethylene-propylene copolymer is formed may be used.
The thickness of the sealant layer 3g is appropriate as long as sufficient bonding strength with the mouth portion 1a is obtained, and when the separating line portion 6 does not penetrate the sealant layer 3g, the shearing layer 3g has a shear strength that is lower than the separating strength. It can be a thickness.

Next, the manufacturing method of the inner seal material 5 of the present embodiment will be described.
FIG. 4 is a flowchart showing a process flow of the inner seal material manufacturing method according to the first embodiment of the present invention.

In order to manufacture the inner seal material 5 of the present embodiment, as shown in FIG. 4, the intermediate laminate forming step S1, the cut line portion forming step S2, the punching laminate forming step S3, and the punching step S4 are performed in this order. Do.
First, intermediate laminated body formation process S1 is performed. This step is a step of forming an intermediate laminated body 3E (see FIG. 2A) including a layered portion in a range where the separation line portion 6 is engraved in a size that allows a plurality of inner seal materials 5 to be punched out. .
In the present embodiment, the intermediate laminate 3E includes a barrier layer 4c, an adhesive layer 4d, a base material layer 4f, a resin layer e, a release layer 3a, a sheet base material layer 3d, an ink layer 3e, and a resin layer 3f in this order. It is a laminated one.
Moreover, this process is a roll-to-roll system and can perform each partial process demonstrated below continuously in parallel.

First, in the first partial process, necessary printing is performed on the surface of the sheet base material layer 3d that has been surface-treated or coated as necessary.
For example, an ink layer 3e corresponding to a picture predetermined by printing is formed on the surface of the sheet base material layer 3d.
Further, a predetermined pattern is printed on the upper surface as necessary, and the printed surface is coated with a protective coating with, for example, OP varnish. Furthermore, after the release agent 3a2 is solidly coated on the protective coat, the adhesive 3a1 is printed on the release agent 3a2 so that the patterns PC and PD are drawn, thereby performing pattern coating.
In the printing in this step, single-sided or front / back simultaneous printing is performed on the laminate of the sheet base material layer 3d.
At this time, the printing standards on the front and back sides are adjusted in advance, and the front and back patterns and the coating pattern are aligned in accordance with the punching positions.

Next, in the second partial process, after an anchor coat is applied on the ink layer 3e, the resin layer 3f is laminated.
As a method for laminating the resin layer 3f, for example, a melt extrusion method can be employed.
Next, in the third partial process, the base material layer 4f and the barrier layer 4c bonded together in advance are laminated and bonded onto the release layer 3a via the resin layer 4e without an anchor coat. As a method for laminating the resin layer 4e, for example, extrusion lamination can be adopted.
Thus, the intermediate laminate 3E is formed, and the intermediate laminate formation step S1 is completed.

Next, the separation line portion forming step S2 is performed.
This step is a step of engraving the separation line portion 6 in the intermediate laminate 3E. For example, the intermediate laminate 3E is moved to the engraving separation line portion processing machine.
The separating line section processing machine includes a transport facility, a carbon dioxide laser generator for engraving the separating line section 6, and a processing position identifying means for reading a register mark printed on the sheet base material layer 3d of the intermediate laminate 3E. The processing position identification means reads the register mark to move at least one of the position of the laser generator and the intermediate laminate 3E, and move from the resin layer 3f side of the intermediate laminate 3E toward the lamination direction. The separation line portion 6 is engraved at a depth that penetrates at least the sheet base material layer 3d.
Since the carbon dioxide laser beam is reflected by the metal, when the barrier layer 4c is made of a metal layer such as an aluminum foil, opening guide wire processing can be performed while stably maintaining the barrier property of the barrier layer 4c.
This is the end of the separation line portion forming step S2.
In addition, the shape of the parting line part 6 can form the parting line part of various shapes by changing the drawing line pattern of the parting line part processing machine into a predetermined shape.

Next, the punching laminate forming step S3 is performed. This step is a step of laminating the adhesive layer 4b, the paper layer 4a, and the sealant layer 3g on the intermediate laminate 3E to form a punched laminate.
The paper layer 4a is laminated on the barrier layer 4c via the adhesive layer 4b, and the barrier layer 4c and the paper layer 4a are joined.
Next, a sealant layer 3g is laminated on the resin layer 3f side. The sealant may be laminated on the intermediate laminate 4E if it has laser processing suitability.
In this way, a punching laminate is formed which is a sheet-like laminate having a laminated structure similar to that of the inner seal material 5 and provided with the separation line portion 6 in the range of the intermediate laminate 3E.
This is the end of the punching laminate forming step S3.

Next, a punching step S4 is performed. This step is a step of forming the inner seal material 5 by punching the punched laminate into the outer shape of the inner seal material 5.
This step is performed, for example, by moving the punched laminate to a punching machine.
The punching machine includes a punching die for punching the outer shape of the inner seal member 5, and a punching position identifying means for reading the tracking eye mark printed on the sheet base material layer 3d of the punching laminate. .
For this reason, the punching position identification means reads the tracking eye mark to move the position of at least one of the punching die and the punching laminate, and aligns the punching die and the separation line portion 6 so as to perform punching. The inner seal material 5 is punched out from the laminated body. Thereby, in this embodiment, it punches into the concentric outer shape with respect to the parting line part 6, and the inner seal material 5 is formed.
Thus, the punching process S4 is completed.

In order to form the container sealing structure of the present embodiment using the inner seal material 5 manufactured in this way, first, the bottle 1 is filled with contents such as instant coffee.
Next, the lid member 2 is screwed into the mouth portion 1a with the upper surface 4A of the upper sheet material 4 facing the inner top surface 2a of the lid member 2 and the inner seal material 5 being inserted into the lid member 2. To do.
Then, the lid member 2 is tightened to bring the sealant layer 3g into contact with the front end surface 1d of the mouth 1a and to bring the paper layer 4a into contact with the inner top surface 2a. In this state, the sealant layer 3g and the mouth end surface 1d of the mouth 1a are joined.
In the present embodiment, a high-frequency seal is applied from the top surface side of the lid member 2 so that the sealant layer 3g is welded to the front end surface 1d of the mouth portion 1a, thereby joining them.
Thus, a container sealing structure as shown in FIG. 1A can be formed.
According to such a container sealing structure, the opening of the mouth portion 1 a is sealed by the inner seal material 5.
Since the inner seal material 5 is provided with the barrier layer 4c at a position covering the separation line portion 6, it is possible to suppress moisture ingress and gas permeation.

Next, the operation at the time of opening the container sealing structure of the present embodiment will be described.
In order to open the container sealing structure of the present embodiment, the lid member 2 is rotated in the direction opposite to the tightening direction. As a result, the lid member 2 rotates from the position at the time of sealing and moves above the front end surface 1d of the mouth, so that an external force is applied to the outer peripheral portion of the inner seal member 5 from the holding projection 2d of the lid member 2. The inner seal material 5 is pulled upward by acting. At this time, the outer portion 3C of the lower sheet material 3 is joined to the mouth tip surface 1d and has flexibility, so that it tends to pass through the holding projection 2d and remain on the mouth tip surface 1d.
On the other hand, since the upper sheet material 4 has a highly rigid paper layer 4a, it cannot pass through the holding projection 2d and is pulled upward together with the holding projection 2d. For this reason, a stress distribution is generated inside the inner seal material 5.
In the present embodiment, the bonding strength between the upper surface 3A of the outer portion 3C and the lower surface 4B of the upper sheet material 4 and the separation strength of the separation line portion 6 are the same between the upper surface 3A of the inner portion 3D and the lower surface 4B of the upper sheet material 4. Since the bonding strength and the bonding strength between the lower surface 3B of the outer portion 3C and the front end surface 1d of the mouth portion 1a are smaller, when the internal stress increases with the rotation of the lid member 2, these relative The bonding state of the low strength portion is destroyed.
That is, in the outer portion 3C, the release layer 3a constituting the upper surface 3A and the resin layer 4e of the upper sheet material 4 are separated and separated. Further, in parallel with this, the inner peripheral surface of the penetrating portion 6a of the penetrating portion 6a slides and the non-etched portion 6b is broken.

At this time, in the present embodiment, the separation line portion 6 is also penetrated through the resin layer 4e. However, the entire upper surface side of the resin layer 4e is bonded to the barrier layer 4c with a uniform bonding strength via the adhesive layer 4d. Therefore, it is not cut off like the cut-off line portion 6 of the lower sheet material 3.
Further, the separation line portion 6 does not penetrate through the sealant layer 3g. However, since the shear strength of the sealant layer 3g is lower than the separation strength of the separation line portion 6, both the separation portion 6 are easily broken.

In this way, when the lid member 2 is removed, as shown in FIG. 1B, the lower sheet material 3 is separated into the outer portion 3C and the inner portion 3D with the separation line portion 6 as a boundary, and the outer portion 3C. Remains on the bottle 1 side while being joined to the mouth portion 1a, and the inner side portion 3D remains on the lid member 2 side while being joined to the upper sheet material 4 held by the holding projection 2d of the lid member 2. To do.
Moreover, the opening 1c along the closed curve along which the separating line part 6 is formed is formed in the mouth part 1a by the remaining outer part 3C.
In addition, when the lid member 2 is reattached to the mouth portion 1a after opening, the upper surface 3A of the outer portion 3C comes into close contact with the lower surface 4B of the upper sheet material 4 joined before opening, so that it is sealed again. It is possible.

  Thus, according to the container sealing structure of the present embodiment, the sealed state by the inner seal material 5 joined to the mouth portion 1a of the bottle 1 can be released simply by removing the lid member 2, and the lid member By reattaching 2, the mouth 1a can be sealed again.

[First Modification]
Next, a container sealing structure and an inner seal material according to a first modification of the present embodiment will be described.
As shown in FIG. 1A, the container sealing structure of the present modification uses an inner seal material 15 instead of the inner seal material 5 of the first embodiment.
As illustrated in FIG. 2A, the inner seal material 15 includes a glassine layer 13 g instead of the sealant layer 3 g of the inner seal material 5.
Hereinafter, a description will be given centering on differences from the first embodiment.

The glassine layer 13g constitutes the lower surface 3B of the lower sheet material 3, and is joined to the mouth tip surface 1d of the mouth 1a with the same joining strength as the sealant layer 3g of the first embodiment. The upper surface of the glassine layer 13g is laminated and bonded to the resin layer 3f.
The glassine layer 13g is laminated in the intermediate laminate formation step so as to be penetrated by the separation line portion 6.
The basis weight of the glassine paper used for the glassine layer 13g is, for example, 15 g / m ^{2 to} 50 g / m ^2.
Is preferred.

In order to form a container sealing structure using the inner seal material 15, first, as in the first embodiment, the bottle 1 is filled with contents, and the inner seal material 15 is inserted into the lid member 2. . Before the lid member 2 is screwed into the mouth portion 1a, an aqueous adhesive called glue is applied to the mouth tip surface 1d, and then the lid member 2 is screwed into the mouth portion 1a.
Then, the lid member 2 is tightened so that the glassine layer 13g and the mouth tip surface 1d of the mouth 1a are brought into close contact with each other, and the paper layer 4a and the inner top surface 2a are brought into close contact with each other. By leaving in this state for a certain period of time, the water-based adhesive is cured and the glassine layer 13g and the mouth end surface 1d are joined.

According to this modification, by appropriately selecting the adhesive strength of the adhesive that joins the glassine layer 13g, the mouth end surface 1d and the glassine layer 13g are joined with the same joint strength as in the first embodiment. can do. For this reason, the sealing state can be released by removing the lid member 2 in exactly the same manner as in the first embodiment. Moreover, it can be set in a sealed state by remounting.

[Second Modification]
Next, an inner seal material according to a second modification of the present embodiment will be described.
FIG. 5 is a schematic cross-sectional view along the stacking direction showing a schematic configuration of the inner seal material used in the container sealing structure of the second modified example of the first embodiment of the present invention.

As shown in FIG. 5, the inner seal member 25 of the present modification includes a cut line portion 26 instead of the cut line portion 6 of the inner seal material 5 of the first embodiment.
The separation line portion 26 is formed in a broken line shape similar to the separation line portion 6 of the first embodiment, and differs only in that it penetrates the sealant layer 3g.
Hereinafter, a description will be given centering on differences from the first embodiment.

In the first embodiment, such an inner seal material 25 is formed by applying the sealant layer 3g laminated in the punching laminate forming step S3 between the intermediate laminate forming step S1 and the separation line portion forming step S2. It can manufacture by laminating | stacking on the layer 3f.
In addition, the inner seal material 25 forms the punching laminate by performing the intermediate laminate forming step S1 and the punching laminate forming step S3 in this order, and then forming the separation line portion before performing the punching step S4. You may manufacture by performing process S2. In this case, in the separation line portion forming step S2, the separation line portion 26 is formed by half-cutting the punched laminate in which the separation line portion is not formed from the sealant layer 3g side through the resin layer 4e. It is a process.

According to the inner seal member 25 of this modification, a container sealing structure can be formed in the same manner as the inner seal member 5 of the first embodiment.
In the present modification, the separation line portion 26 also penetrates the sealant layer 3g, so that the separation becomes easier.

[Fourth and fifth modifications]
Next, inner seal materials according to fourth and fifth modifications of the present embodiment will be described.
FIG. 6 is a schematic cross-sectional view in a direction orthogonal to the stacking direction of the inner seal materials used in the container sealing structure of the fourth modified example of the first embodiment of the present invention. FIG. 7 is a schematic cross-sectional view in a direction orthogonal to the stacking direction of the inner seal materials used in the container sealing structure of the fifth modified example of the first embodiment of the present invention.
The fourth and fifth modified examples are modified examples related to the shape of the closed curve along which the separation line portion 6 extends in the inner seal material 5 of the first embodiment.

  As shown in FIG. 6, the inner seal material 45 of the fourth modified example includes a separation line portion 46 instead of the separation line portion 6 of the first embodiment. Below, it demonstrates centering on a different point from the said 1st Embodiment.

The separation line portion 6 of the first embodiment has a smaller diameter than the inner diameter of the inner peripheral surface 1f of the mouth portion 1a, and is formed in alignment with a circle having a diameter d close to the inner diameter of the inner peripheral surface 1f. On the other hand, as shown in FIG. 6, the separation line portion 46 of the present modification has a plurality of penetrating portions 6 a formed along a closed curve pattern made of a circle having a diameter D with respect to the outer diameter circle of the lower sheet material 3. ing. Here, the diameter D is smaller than the inner peripheral surface 1 f of the bottle 1 and smaller than the diameter d.
For this reason, the separation line portion 46 can separate the lower sheet material 3 into a circular inner portion 43D having a smaller diameter than the opening 1c of the mouth portion 1a and an outer portion 43C outside thereof.
Further, when the inner portion 43D is cut off at the time of opening, the mouth portion 1a is covered with the outer portion 43C having a circular opening with a diameter D.
In addition, you may form such a parting line part 46 in the position eccentric from the center of the internal peripheral surface 1f as needed.
According to this modification, it can be opened in a state in which an opening having a smaller area than the mouth 1a is formed. For this reason, the entrance of moisture after opening can be efficiently prevented.

  As shown in FIG. 7, the inner seal material 55 of the fifth modified example includes a separation line portion 56 instead of the separation line portion 6 of the first embodiment. Below, it demonstrates centering on a different point from the said 1st Embodiment.

The separating line portion 56 of this modification has a semicircular shape, and is formed along a closed curve pattern in which the arc-shaped portion is on the inner peripheral surface 1f or close to the inner peripheral surface 1f.
For this reason, the separation line part 56 can separate the lower sheet material 3 into a semicircular inner part 53D having a smaller area than the opening 1c of the mouth part 1a and an outer part 53C on the outer side.
Further, when the inner portion 53D is cut off at the time of opening, the mouth portion 1a is covered with the outer portion 53C having a semicircular opening. According to this modification, the mouth portion 1a has a smaller area than the mouth portion 1a. Thus, it can be opened in a state where the opening is formed at a position deviated with respect to the center of the opening 1c of the mouth portion 1a.
Therefore, for example, it is suitable for an application in which the bottle 1 is tilted and contents are taken out little by little.
Thus, even when the separation line portion 56 is eccentric from the rotation center of the lid member 2, the lid member 2 rotates and is lifted upward, so that it can be separated without any trouble only by removing the lid member 2. it can.
In FIG. 8, the inner portion 53D is drawn in a semicircular shape that substantially bisects the opening 1c, but it may have a shape such as a smaller area.

  In the above description, in the release layer, the example has been described in the case where the inner side portion and the outer side portion are coated in a pattern in which only the adhesive is different, but both the adhesive and the release agent patterns. May be changed.

In the above description, in the release layer, an example in which the bonding strength between the inner part and the outer part is changed by changing the pattern coating pattern between the inner part and the outer part is different. The pattern coating pattern may be common as long as the bonding strength is obtained.
For example, an adhesive having different bonding strength may be pattern-coated with a common pattern between the inner portion and the outer portion to give a difference in bonding strength.

In the above description, examples of the dot coating pattern and the solid coating pattern are shown as the pattern coating pattern. However, these are merely examples, and other appropriate patterns can be adopted. . For example, a lattice pattern or a checkerboard (checkered) pattern may be used, and a pattern made of an appropriate printable pattern may be used.
In addition, these patterns may have a rate of change in bonding strength by changing depending on the location in either the inner part or the outer part.

  In the above description, the release layer 3a is described as a two-layer laminate of the release agent 3a2 and the adhesive 3a1, but the release agent 3a2 and the adhesive 3a1 are formed in a pattern that does not overlap each other. By doing so, you may comprise a single layered part.

In the above description, the example in which the separation line portion is formed in a broken line shape has been described. However, the separation line portion is not limited to the broken line shape as long as the necessary separation strength is obtained. For example, the penetrating part may be a dotted line as a circular hole.

  In the above description, the example in which the lid member 2 has a bottomed cylindrical outer shape has been described, but the shape of the lid member 2 is another known shape used as a lid member of a container. Is possible. For example, a bottomed cylindrical shape having a polygonal top surface is also possible.

  In the above description, the lid member and the mouth portion are each provided with a screw-in projection having a spiral shape, so that the attachment and detachment is performed by screwing. However, for example, the side surface of the lid member is deformed. For example, a snap-fit structure that can be attached and detached in the direction along the central axis of the mouth may be provided and attached.

Further, the layer configuration of the upper sheet material and the lower sheet material in the above description is an example, and the layer configuration is not limited to the above example as long as the bonding strength is appropriately set.
For example, the lower sheet material can be configured to include an appropriate number of appropriate intermediate layers between a release layer that constitutes the upper surface and a sealant layer or glassine layer that constitutes the lower surface.
In addition, for example, the upper sheet material can be configured to include an appropriate number of appropriate intermediate layers between a paper layer constituting the upper surface and a resin layer constituting the lower surface.

  The components described in the above embodiments and modifications can be implemented by appropriately combining or deleting them within the scope of the technical idea of the present invention.

  Below, the Example corresponding to said each embodiment is described with a comparative example.

Example 1 is an example corresponding to the inner seal material 55 (see FIG. 7) of the fifth modified example of the first embodiment, and the cross-sectional configuration thereof is shown in FIG. It is the same as the inner seal material 5 shown.
The inner seal material 55 of this example was manufactured as follows.
First, on the upper surface of the sheet base material layer 3d made of biaxially stretched polyethylene terephthalate having a thickness of 16 μm, a pattern layer that becomes the ink layer 3e using a PET ink and a release that becomes the release agent 3a2 of the release layer 3a After the varnish is solidly printed to a thickness of 2 μm, the adhesive varnish to be the adhesive 3a1 of the release layer 3a is also 2 μm thick, and the dot pattern having a diameter of 0.5 mm is formed at a pitch of 4 mm in the region to be the outer portion 53C. In the region to be the inner portion 53D, solid printing was performed on the area except for the inner edge 3mm (LD = 3 (mm)) to form the release layer 3a.
Separately, a base film layer, which is a biaxially stretched PET film with a thickness of 12 μm, and a barrier layer 4 c made of an aluminum foil with a thickness of 7 μm are laminated using a urethane adhesive that is an adhesive layer 4 d to create a laminated film. did.
Next, a urethane anchor coat material is applied to the surface of the laminated film on the PET film side,
Next, a polyethylene layer having a thickness of 15 μm to be the resin layer 4e is laminated on the outer surface of the release layer 3a of the printed sheet base material layer 3d by the melt extrusion method, and the outer surface of the PET film on the back side After performing the anchor coating, a polyethylene layer having a thickness of 15 μm to be the resin layer 3f was laminated. Thereby, the intermediate | middle laminated body 3E was formed (intermediate laminated body formation process S1).

Next, a laser beam generated by a carbon dioxide laser generator from a resin layer 3f side to form a circular pattern having a diameter of 35 mm is applied to the intermediate laminate 3E to reach a depth from the resin layer 3f to the resin layer 4e. Penetration processing was performed so that the solid print portion of the adhesive varnish was disposed in the blade region, and the separation line portion 6 was formed. (Separation line part formation process S2).

Next, the aluminum foil surface of the barrier layer 4c of the intermediate laminate 3E on which the separation line portion 6 is formed, and the base paper of the basis weight of 320 g / m ² (see Table 1) to be the paper layer 4a, the adhesive layer 4b The resulting laminate was laminated with a wax adhesive having a thickness of 5 μm.
Moreover, 15 g / m ² of hot melt adhesive was laminated on the resin layer 3 f as the sealant layer 3 g.
Thus, a sheet-shaped punching laminate comprising hot melt / polyethylene / biaxially stretched polyethylene terephthalate / printing layer / release layer / polyethylene / PET / adhesive / aluminum foil / wax adhesive / paper layer in this order from the bottom surface 3B side. A body was produced (punching laminate forming step S3).

  Next, this laminated body for punching was punched into a disk shape having a diameter of 46 mm at a predetermined position to produce an inner seal material 55 (punching step S4).

In this example, when the bonding strength between the release layer 3a and the resin layer 4e was measured, the outer portion 53C was 0.3 N / 15 mm wide, and the inner portion 53D was 1.5 N / 15 mm wide (Table 1). Here, the bonding strength was measured by 90-degree peeling.
Next, after the inner seal material 55 is loaded into the plastic cap made of PP as the lid member 2 from the paper layer 4a side, the glass bottle (bottle 1) as the adherend is filled with instant coffee as the contents. After that, I tightened the plastic cap.
Then, 3 g of the sealant layer was welded to the bottle 1 with a high frequency seal. As a result, the mouth 1a of the bottle 1 was sealed.
Thereafter, when the plastic cap is removed, the lower sheet material 3 is separated by the separation line portion 6 and opened, and all layers of the upper sheet material 4 remain in the plastic cap, and the outer portion 53 is placed on the upper sheet material 4.
All the layers of the inner portion 53D of the lower sheet material 3 separated from C remained.
In addition, the outer layer 53 </ b> C of the lower sheet material 3 remained on the mouth 1 a of the bottle 1 in all layers.
In this way, the lower sheet material 3 could be opened with a semicircular opening formed.

In Example 2, as shown in Table 1, the basis weight of the paper layer 4a is 620 g / m ² with respect to the inner seal material 55 of Example 1, and the separation line portion 6 is La = 10 (mm). , Lb = 1.5 (mm) provided in a dotted line pattern.
Also, the bonding strength was changed to 0.5 N / 15 mm width for the outer portion 3C and 2.5 N / 15 mm width for the inner portion 3D by changing the coating pattern.

In Example 3, as shown in Table 1, with respect to the inner seal material 55 of Example 1, the separation line portion 6 has La = 10 (mm) and Lb = 0.5 (mm), the upper sheet The difference is that the aluminum foil layer is 7 μm.
Further, the bonding strength was set to 4.0 N / 15 mm width by changing the coating pattern only in the inner part 3D.

In Example 1, the basis weight of the paper layer 4a is 104 g / m ² , the fixing method to the plastic cap is in-mold molding at the time of plastic cap molding, and the shape of the separation line portion 6 is a semicircle. It is an example.

<Comparative Examples 1 and 2>
Comparative Example 1 is an example in which the barrier layer in Example 1 is not an aluminum foil but an aluminum-deposited PET film of 12 μm.
The comparative example 2 is an example in the case where, in the first embodiment, the separation part 6 is not laser processed but is penetrated by a blade.

[Evaluation]
The inner seal materials of each of the examples and comparative examples thus produced were evaluated for processability and openability as follows.
In the evaluation of workability, it was evaluated whether there were any defects in actual processing. In Table 1, “x” is described when a problem occurs, and “◯” is indicated when the machining can be performed without any problem.
Regarding barrier properties, use the inner seal material and plastic cap to fill the glass bottle with the contents and seal it. When it did, it described as "x".
The evaluation of the unsealing property was carried out by using each inner seal material and plastic cap, filling the glass bottle with the contents and sealing it, then removing the plastic cap and opening it, and observing how it was opened. Table 1 can be opened smoothly, and after opening, the outer portion of the lower sheet material separated from the lower sheet material remains in the mouth 1a, and the opening is neatly formed along the separation line portion. The case where it was formed was described as “◯”, the case where the shape of the opening was slightly disturbed, “Δ”, and the case where some trouble occurred in the shape as “X”. In addition, “−” indicates that the separation line portion is not formed, and thus is not an evaluation target.

[Evaluation results]
In Examples 1, 3, and 4, as shown in Table 1, the workability, the barrier property, and the unsealing property were “◯”, and good workability and unsealing property were obtained.
In Example 2, the shape of the opening was slightly disturbed and the opening property was “Δ”, but the barrier property and workability were “◯”. The reason why the unsealing property is inferior to those of Examples 1, 3, and 4 is considered to be because the uncut portion Lb in the separation line portion is as wide as 1.5 mm. When better openability is required, it is desirable to employ a continuous line.

In Comparative Example 1, when performing high frequency sealing, it was necessary to increase the output and perform high frequency sealing as compared with Examples 1 to 4. Further, in Comparative Example 1, a decrease in barrier properties was observed. This is probably because the laser was absorbed by the PET base material layer on which the barrier layer was laminated, and the aluminum vapor deposition layer laminated on the PET base material layer was damaged.
On the other hand, in Comparative Example 2, the base material layer surrounded by the separation line portion dropped off in the separation portion forming step, and quality could not be ensured due to mixing of foreign matters, and production was impossible.
The above results are summarized in Table 1 below.

1 ・ ・ Bottle (container)
1a ·· mouth portion 1c ··· opening 1d ··· mouth end surface 1e · · outer peripheral surface 2 · · lid member 3 ··· lower sheet material 3A · · upper surface (surface on the upper sheet material side)
3B ..Lower surface (surface opposite to the upper sheet material)
3C, 43C, 53C .. Outer part 3D, 43D, 53D .. Inner part 3E... Intermediate laminate 3a .. Release layer 3a1 .. Adhesive 3a2 .. Release agent 3b. Layer 3c ... Adhesive layer 3d ... Sheet base layer 3e ... Ink layer 3f ... Resin layer 3g ... Sealant layer 4 ... Upper sheet material 4A ... Upper surface (one surface)
4B ..Lower surface (the other surface)
4a ··· Paper layers 4b and 4d · · Adhesive layer 4c · · Barrier layer 4e · · Resin layer 4f · Base material layers 5, 15, 25, 45 and 55 · · · Inner seal material 6, 26, 46, 56 .. Disconnection line portion 6a ..Penetration portion 6b ..Uncut portion 13g ..Glasine layer PC, PD ..Pattern S1 ..Intermediate laminate formation step S2 ..Separation line portion formation step S3. Laminate formation step S4 ·· Punching step d · Concentric diameter D ₁ · Diameter La · Length in the circumferential direction (penetrating portion)
Lb ... Length in the circumferential direction (non-engraved part)
Lc ... Arrangement pitch A ... A part B ... Cut surface of the sectional view

Claims (5)

A container sealing structure for sealing a container by attaching a lid member having an inner seal material to the mouth of the container,
One surface of the inner seal material is fitted to the lid member or bonded and fixed to the lid member by in-mold molding, and an upper sheet material provided with a metal foil layer as a barrier layer;
A lower sheet material that is joined to the mouth of the container on the outer side of the surface opposite to the upper sheet material and does not have a barrier layer;
The lower sheet material is releasably bonded to a surface different from the surface contacting the top surface of the lid member of the upper sheet material,
While being formed so as to be separable into an outer part and an inner part with a separation line part engraved along a closed curve pattern in a region inside the inner periphery of the mouth part of the container as a boundary,
The parting line part is formed by the carbon dioxide laser processing machine, starts from the lower sheet, passes through the bonding interface of the upper and lower sheet materials,
A container sealing structure, wherein a separation line portion is engraved at a depth that does not penetrate at least the barrier layer of the upper sheet material.   The container sealing structure according to claim 1, wherein the separation line portion is processed by a continuous line. In the lower sheet material, the surface layer portion on the upper sheet material side is subjected to pattern coating with an adhesive that adheres to the upper sheet material and a release agent that has lower adhesion to the upper sheet material than the adhesive. A release layer formed by
A sheet-like coating base material that supports the release layer from the lower sheet side is provided, and by changing the pattern coating pattern of the adhesive and the release agent between the outer side and the inner side,
The container sealing structure according to claim 1 or 2, wherein a bonding strength between the outer portion and the upper sheet material is smaller than a bonding strength between the inner portion and the upper sheet material.   The container sealing structure according to any one of claims 1 to 3, wherein the breaking strength of the separation line portion is 2 N / 15 mm or less. An inner seal material used for fixing the lid of the container and the mouth of the container to seal the mouth of the container,
The inner seal material is an upper sheet material whose one surface is fitted to the lid member or bonded and fixed to the lid member by in-mold molding,
Laminated on the other surface of the upper sheet material and bonded to the upper sheet material, and comprises a lower sheet material that can be bonded to the mouth portion on the outer side of the surface opposite to the upper sheet material
The lower sheet material is releasably bonded to a surface different from the surface contacting the top surface of the lid member of the upper sheet material,
The inner seal material is characterized in that the separation line portion starts from the lower sheet, passes through the bonding interface between the upper and lower sheet materials, and is cut at a depth that does not penetrate at least the barrier layer of the upper sheet material.