JP2014227181A - Container sealing structure and inner seal material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container sealing structure and an inner seal material used for the same which can maintain a sealed state by the inner seal material joined to a mouth part of a container when a cap is opened, can release the sealed state easily, is easy to take out contents, can seal the mouth part again by reattaching a lid member.SOLUTION: A container sealing structure seals a container 1 by attaching a lid member 2 having an inner seal material 5 to a mouth part 1a of the container 1, and includes an upper sheet material 4 of which one surface is fitted to the lid member 2, and a lower sheet material 3 which is laminated on the other surface of the upper sheet material 4 and is joined to the upper sheet material 4, and is joined to the mouth part 1a on an outer side part of a surface opposite to the upper sheet material 4. The lower sheet material 3 is peelably joined to the other surface of the upper sheet material 4, and includes an opening guide line 6 carved at a depth which does not penetrate at least a barrier layer of the lower sheet material 3.

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, the sealing inner seal material is peelably laminated on the reseal layer of the lid member, and such a lid member is tightened into the container for sealing. The inner seal material 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 material, 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.

  In Japanese Patent Application No. 2012-036696, when the cap is removed by providing a separating line with a depth that penetrates the lower sheet material, the sealed state by the inner seal material joined to the mouth portion of the container, There is described an inner seal material for container sealing which can be opened only by removing the lid member and can be re-sealed 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 collar 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.
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 technology of Japanese Patent Application No. 2012-036696, the sealing inside the container is not maintained as soon as the upper sheet is peeled off from the lower sheet, and the product cannot be regenerated if a “dropping” quality defect occurs. It is.

  The present invention has been made in view of the above problems, and when the cap is opened, the sealed state by the inner seal material joined to the mouth portion of the container can be maintained. To provide a container sealing structure in which a sealed state can be easily released, contents can be easily taken out, and a mouth can be sealed again by reattaching a lid member, and an inner seal material used therefor Objective.

  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 of a container to seal the container, the inner The sealing material has an upper sheet material whose one surface is fitted to the lid member, and is laminated on the other surface of the upper sheet material and joined to the upper sheet material, and the surface opposite to the upper sheet material A lower sheet material joined to the mouth portion at an outer side of the lower sheet material, and the lower sheet material is detachably joined to the other surface on the upper sheet material side and penetrates at least the barrier layer of the lower sheet material The opening guide line is engraved at a depth that does not.

  According to a second aspect of the present invention, in the container sealing structure according to the first aspect, the opening guide line extends from the two points on the outer edge of the inner seal material toward the inside of the product body, and merges with each other. Or it has joined substantially in the state which provided the part of uncut, The said lower sheet material is set as the structure joined to the opening | mouth part of the said container so that peeling is possible.

  According to a third aspect of the present invention, in the container sealing structure according to the first or second aspect, the opening guide line portion includes a plurality of fragile portions that are cut through in a linear shape, and the engraved pattern It is set as the structure formed so that it may be spaced apart along a broken line shape.

  In invention of Claim 4, in the container sealing structure of any one of Claims 1-3, the said lower sheet material laminates | stacks aluminum foil as a barrier layer on the uppermost part of thickness direction. The opening guide line portion is formed by a carbon dioxide laser processing machine.

In invention of Claim 5, in the container sealing structure of any one of Claims 1-4, the breaking strength of the said opening guide wire part is 0.1N / 15mm or more and 2N / 15mm or less It is set as the characteristic characterized by this.

  The invention according to claim 6 is an inner seal material used by being attached to the lid member and the mouth portion of the container for sealing the mouth portion of the container, and one surface of the inner seal material is the lid. An upper sheet material fitted to a member, laminated on the other surface of the upper sheet material and bonded to the upper sheet material, and bonded to the mouth portion at the outer portion on the surface opposite to the upper sheet material The lower sheet material is releasably bonded to the other surface on the upper sheet material side, and the opening guide line is cut at a depth that does not penetrate at least the barrier layer of the lower sheet material. It is assumed that it is installed.

  According to the container sealing structure and the inner seal material according to the present invention, when the upper sheet material moves together with the lid member when the lid member is removed from the mouth portion of the container, the separation between the lower sheet material and the upper sheet material is achieved. Advances and the lower sheet material provided with the opening guide line is exposed. At this time, the sealed state by the inner seal material joined to the mouth of the container can be maintained by the lower sheet material. By pushing the vicinity of the opening guide line into the container, a grip allowance can be obtained. Subsequently, the lower sheet material can be torn along the opening guide line to release the seal. It is possible to re-seal the mouth part by re-mounting.

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 a cap opening. It is the typical sectional view along the lamination direction which shows the schematic structure of the inner seal material used for the container sealing structure of the 1st embodiment of the present invention, and the typical bird's-eye view. 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 a typical bird's-eye view of the inner seal material used for other container sealing structures of the present 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.

  FIGS. 1A and 1B are schematic cross-sectional views showing a schematic configuration when the container sealing structure of the first embodiment of the present invention is sealed and when the cap is opened. 2A and 2B are a schematic bird's-eye view of an inner seal material used in the container sealing structure according to the first embodiment of the present invention, and a schematic cross-sectional view in a direction orthogonal to the stacking direction. .

  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 bottle 1 can adopt an appropriate shape and material according to the contents.

  For example, when storing contents such as powder seasonings and 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.

  Since FIG. 1A is a schematic diagram, the front end surface 1d of the mouth is drawn as a plane that touches the outer peripheral surface 1e and the inner peripheral surface 1f, but the outer peripheral surface 1e, the inner peripheral surface 1f, and the front end of the mouth Between the surface 1d, a corner portion that is rounded or has an inclined surface may be formed.

  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 screwing protrusion 2c that can be screwed with the screwing protrusion 1b of the mouth 1a.

  The material of the lid member 2 is not particularly limited as long as the material can fix the inner seal material 5 to the inner top surface 2a. For example, a synthetic resin or a 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 material 5 in plan view is a circle having a smaller diameter than the inner top surface 2a and a larger diameter than the outer shape of the outer peripheral surface 1e of the mouth portion 1a.

  In the container sealing structure of the present embodiment, the upper sheet material 4 is fixed to the inner top surface 2a of the lid member 2 on the upper surface 4A that is one surface in the thickness direction, and the lower surface 4B that is the other surface in the thickness direction. In FIG. 2, the upper sheet 3A is releasably joined to the upper surface 3A of the lower sheet material 3.

  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 is a laminate in which a paper layer 4a, an adhesive layer 4b, a base material layer 4c, and a resin layer 4d are laminated in this order from the upper surface 4A to the lower surface 4B. It is.

  For this reason, the paper layer 4 a constitutes the uppermost layer of the upper sheet material 4, and the resin layer 4 d 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 d 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, and has a rigidity capable of moving integrally with the lid member 2 when the lid member 2 is removed and opened. Consists of.

As such a paper layer 4a, a thick paper having a basis weight of 200 g / m ² or more and 800 g / m ² or less is suitable.

When the basis weight is less than 200 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 separates the opening guide wire 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.

  The adhesive layer 4b is a layered portion for adhering and fixing the paper layer 4a and a base material layer 4c, which will be described later, and peeling between the base material layer 4c and the paper layer 4a occurs due to an external force acting at the time of opening. It is formed using an appropriate adhesive that provides a low adhesive strength.

  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 a quick-drying wax adhesive or hot melt adhesive as the adhesive layer 4b in consideration of the workability of lamination and cutting.

  The base material layer 4c is a sheet-like member provided as a strength holding layer when laser-processing the opening guide line portion 6 described later, and is particularly necessary when the opening guide wire portion 6 is processed by penetrating with a blade. In some cases, the adhesive layer 4b and the base material layer 4c are laminated as necessary.

  The configuration of the base material layer 4c is not particularly limited as long as the base material strength can be maintained. For example, a synthetic resin film, a film coated with an inorganic material, a sheet-like member such as a metal foil, or the like can be employed.

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.

  Examples of the metal foil that can be used for the base material layer 4c include an aluminum foil, an iron foil, a copper foil, and a tin foil.

  The resin layer 4d 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.

  Examples of adhesive resins suitable for the resin layer 4d include, for example, polyolefins such as polyethylene and polypropylene, ethylene-methacrylic acid copolymers, ethylene-vinyl acetate copolymers, acid copolymer resins such as ionomers, ethylene-propylene, and the like. 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 resin layer 4d is preferably 10 μm or more. The upper limit value of the thickness of the resin layer 4d may be in a range that satisfies the required adhesive strength and is suitable for the packaging material cost, but may be appropriately set as necessary with 30 μm as the upper limit value. preferable.

  As shown in FIG. 2A, the lower sheet material 3 includes a release layer 3a, a barrier layer 3b, an adhesive layer 3c, a base material layer 3d, an ink layer 3e, and a sealant from the upper surface 3A toward the lower surface 3B. The layer 3f is a laminated body 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 f 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 f constitute an intermediate layer of the lower sheet material 3.

  Further, in this embodiment, the opening guide wire portion 6 is engraved through each layer of the lower sheet material 3 excluding at least the barrier layer 3b and the sealant layer 3f.

  The region along which the opening guide line portion 6 is aligned 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. In addition, the inner seal material outer line extends from the two points toward the inside of the product main body, and has a shape that merges with each other.

  The unwrapping guide wire portion 6 is formed by alternately forming through 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 over the entire circumference. As a broken line.

  When the opening guide line portion 6 is formed in a closed curve pattern as shown in FIG. 4, in the present embodiment, the closed region is preferably provided in a region inside the inner diameter of the inner peripheral surface 1 f of the container mouth portion.

  The separation strength of the opening guide line portion 6 is set such that the length La and Lb are appropriately set so that the opening can be pushed open with a fingertip.

  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 release layer 3a is punched by locally applying an adhesive on the release agent applied so as to be laminated on the entire upper surface of the barrier layer 3b serving as a sheet-like coating substrate. In addition, it is possible to appropriately exhibit strength so that the upper and lower sheets are not crushed in an intermediate process such as loading.

  The release layer 3a 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 to be easily separated by an external force such as a tensile force or a shearing force that acts on the outer portion when opened. Set. Therefore, the bonding strength needs to be smaller than the bonding strength between the mouth end surface 1d described later and the lower surface 3B of the outer portion.

  In this embodiment, it is a pattern in which dot-like adhesives are arranged and applied in a grid pattern. For this reason, the release agent is exposed between the dot-like adhesives.

  Thereby, the bonding strength with respect to the upper sheet material 4 in the outer portion is determined by setting the arrangement pitch and the dot diameter to appropriate dimensions, and the bonding strength according to the area ratio of the adhesive and the release agent in the outer portion. can do.

  As the release agent, nitrocellulose resin, polyamide resin, acrylic resin, rubber resin, polyester resin, polyurethane resin, vinyl chloride-vinyl acetate copolymer resin or the like, or two or more of these are included. Mixtures can be employed.

  As the release agent, 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 as described above has low affinity with polyethylene. Therefore, for example, when a polyethylene layer is laminated on the surface of the release agent by melt extrusion, the adhesive strength between the release agent and the polyethylene layer becomes 0.1 N / 15 mm width to 1.0 N / 15 mm width. With such an adhesive strength, the release agent and the polyethylene layer are peeled off very easily by an external force acting at the time of opening.

  As the adhesive, any appropriate material can be adopted as long as it can be applied onto the release agent and can be bonded to the release agent. In this embodiment, as an example, a resin having heat sealability is employed.

Examples of such a resin having heat sealability preferable as an adhesive include, for example, a simple substance such as urethane resin, vinyl chloroacetate resin, chlorinated PP resin, chlorinated EVA resin, and modified PE resin, or two of these. The mixture containing the above can be mentioned.

  Any resin suitable as an adhesive 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 by melt extrusion, the adhesive and the polyethylene layer are bonded with higher strength than the release agent.

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

  As described above, for example, if a resin such as polyethylene having a low affinity for the release agent is employed as the resin layer 4d of the upper sheet material 4 and is laminated on the release agent by melt extrusion, the strength is low. With bonding strength, they can be bonded together and easily peeled off.

  Therefore, the structure which has only a peeling agent is also possible for an outer side part.

  However, as in the present embodiment, if the bonding strength is increased to such an extent that the opening is not hindered by pattern application of the adhesive, for example, in the manufacturing process of the inner seal material 5, the lower sheet material 3 and It is possible to prevent the outer portion and the upper sheet material 4 from peeling or dripping when an external force is applied due to work after the upper sheet material 4 is joined, handling, loading into the lid member 2 or the like. For this reason, the work efficiency in a manufacturing process can be improved and the defect rate can be reduced.

  The barrier layer 3b is a sheet-like member that is provided to maintain the barrier property of the inner seal material 5 and supports the release layer 3a, and is a member that can be adhered to the release layer 3a by applying the release layer 3a so as not to peel off. If it is, it will not be specifically limited.

  For example, a metal foil such as an aluminum foil, a synthetic resin film such as a PET film, or a sheet member obtained by subjecting these metal foil and synthetic resin film to surface treatment or coating can be employed.

  As a kind of synthetic resin film, each synthetic resin film illustrated by description of the base material layer 4c other than PET film can be employ | adopted, for example.

  Examples of the surface treatment include easy adhesion treatment for improving the adhesion of the pattern ink and gloss varnish treatment for improving the metallic luster.

  Examples of the type of coating include coating with OP varnish for improving gloss and protecting the ink surface.

  In this embodiment, since the release agent is solid-coated on the barrier layer 3b, the barrier layer 3b only needs to have a surface to which the release agent can adhere.

  The lower surface of the barrier layer 3b (the surface on the adhesive layer 3c side) 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 barrier layer 3b using an ink that can be printed on the barrier layer 3b.

  In the present embodiment, the pattern printed on the upper surface of the barrier layer 3b becomes a pattern that can be seen from the upper surface 3A side of the outer side when opened, and the pattern printed on the lower surface of the barrier layer 3b is a lid member when opened. 2 is a picture that can be seen from the lower surface 3B side of the inner side portion remaining.

  If, for example, an aluminum foil is used as the barrier layer 3b, the barrier property of moisture and gas can be improved in the lower sheet material 3 together with the barrier layer 4c of the upper sheet material 4, and better sealing characteristics can be obtained. Therefore, it is preferable.

  In view of the fact that after the outer shape of the inner seal material 5 is punched and curling occurs, handling suitability such as stacking suitability and filling suitability is impaired, a metal foil capable of retouching curling is suitable, and further cost-effective Taking into account, aluminum foil is optimal.

In addition to moisture, the aluminum foil has a high barrier property against gas that also causes odor. The aluminum foil is also suitable when the inner seal material 5 is high-frequency sealed.
Furthermore, when processing the opening guide line portion 6 described later using a carbon dioxide laser, the metal foil does not transmit and absorb the metal foil and reflects it, so that the half-cut processing that leaves the barrier layer is performed stably. I can do it.
Moreover, since the metallic luster (metal texture) is given by seeing the silver glossy surface of the aluminum foil through the release layer 3a on the outer part remaining on the mouth part 1a at the time of opening, the appearance is improved, which is preferable. .

  The adhesive layer 3c is a layered portion that joins and integrates the barrier layer 3b and the base material layer 3d, and peeling between the barrier layer 3b and the base material layer 3d does not occur due to an external force that acts at the time of opening. It is formed of an appropriate adhesive that can provide adhesive strength.

  As the kind of the adhesive layer 3c, an appropriate adhesive can be adopted according to the material of the barrier layer 3b and the base material layer 3d. Examples of suitable adhesives include, for example, dry laminate adhesives, urethane adhesives that are non-solvent adhesives, polyolefin adhesive layers that are extrusion laminated, and the like. In particular, when the release layer 3a and the ink layer 3e are printed at the same time after the barrier layer 3b and the base material layer 3d are bonded together via the adhesive layer 3c, the thickness depends on the thickness of the adhesive layer from the turn bar suitability. An extrusion laminating method that is expected to improve waist strength is desirable.

  The base material layer 3d is for imparting strength to the lower sheet material 3 as a sheet member, and for example, a synthetic resin film similar to the base material layer 4c or a coated synthetic resin film is suitably employed. be able to. For example, a biaxially stretched polyethylene terephthalate film can be suitably used.

  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 opening guide line portion 6 is engraved, or a punching process when forming the outer shape of the inner seal material 5 by punching. Examples include a tracking eye mark for identifying a position. These patterns for the manufacturing process can be finally printed outside the region included in the lower sheet material 3.

  Further, the ink layer 3e may be omitted when a pattern is not necessary.

  The sealant layer 3f 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 3f can be set to an appropriate thickness that provides a sufficient bonding strength with the opening 1a and has a lower shear strength than the separation strength of the opening guide wire portion 6.

  As the sealant layer 3f, the above-mentioned resin layer can be used alone or in multiple layers. In particular, in the case of a resin having a low melt tension such as a hot melt agent, the sealing property is improved by laminating a polyethylene layer between the base material layer 3d and the ink layer 3e, thereby providing an effect as a buffer layer. While playing the role which protects the lower surface of 3d and the ink layer 3e, the joint strength with which peeling with the base material layer 3d does not arise with the external force which acts at the time of opening is obtained.

  If a material having lower rigidity than the base material layer 3d is used as the buffer layer material of the multilayered sealant layer 3f, the 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 during sealing, cushioning can be imparted. For example, when a PET resin film is employed as the base material layer 3d, a suitable cushioning property can be imparted by employing a laminate of a PE resin film and a hot melt agent as the sealant layer 3f.

  Next, the manufacturing method of the inner seal material 5 of the present embodiment will be described.

  FIG. 3 is a flowchart showing a process flow of the method for manufacturing the inner seal material according to the first embodiment of the present invention.

  In order to manufacture the inner seal material 5 of this embodiment, as shown in FIG. 3, the intermediate laminate forming step S1, the unsealing guide wire forming step S2, the punching laminate forming step S3, and the punching step S4 are performed. Do in order.

  First, intermediate laminated body formation process S1 is performed. This step is a step of forming an intermediate laminate 3E (see FIG. 2A) including a layered portion in a range where the opening guide line portion 6 is engraved in a size that allows a plurality of inner seal materials 5 to be punched out. is there.

  In the present embodiment, the intermediate laminate 3E includes a base material layer 4c, a resin layer 4e, a release layer 3a, a barrier layer 3b, an adhesive layer 3c, a base material layer 3d, an ink layer 3e, and a sealant 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.

  When the sealant layer 3f is laminated in the punching laminate forming step S3, or when the sealant layer 3f is a multilayer, a state in which only a part of the layers is laminated may be used as the intermediate laminate 3E.

  First, in the first partial process, the sheet-like barrier layer 3b, which is surface-treated or coated as necessary, and the base material layer 3d are unwound from a roll and bonded to the barrier layer 3b or the base material layer 3d. After the agent layer 3c is applied and dried, the barrier layer 3b and the base material layer 3d are laminated and bonded via the adhesive layer 3c. For example, it joins by the extrusion laminating method of an olefin resin.

  Next, in the second partial process, necessary printing is performed on the outer surfaces of the base material layer 3d and the barrier layer 3b that have been joined in the first partial process.

  For example, an ink layer 3e corresponding to a picture predetermined by printing is formed on the outer surface of the base material layer 3d.

  In addition, a predetermined pattern is printed on the outer surface of the barrier layer 3b as necessary, and the printed surface is coated with a protective coating with, for example, OP varnish. Furthermore, after applying a solid release agent on the protective coat, an adhesive is printed on the release agent in a specific pattern.

  In the printing in this step, front and back simultaneous printing is performed on the laminate of the base material layer 3d and the barrier layer 3b. 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 third partial step, the base material layer 4c is provided on the release layer 3a via the resin layer 4d, and if necessary, the anchor layer is applied on the ink layer 3e, and then the sealant layer 3f is provided. , Respectively.

  As a method of laminating the resin layer 4d, a melt extrusion method is adopted.

  Thus, the intermediate laminate 3E is formed, and the intermediate laminate formation step S1 is completed.

  Next, an opening guide line portion forming step S2 is performed.

  This step is a step of engraving the opening guide wire portion 6 in the intermediate laminate 3E. For example, the intermediate laminate 3E is moved to the opening guide wire portion processing machine for engraving.

  The unsealing guide line section processing machine includes a conveyance facility, a carbon dioxide laser generator for engraving the unsealing guide line section 6, a processing position identifying means for reading a register mark printed on the base material layer 3d of the intermediate laminate 3E, and The processing position identifying means reads the register mark, thereby moving at least one of the laser generator and the intermediate laminate 3E in the lamination direction from the sealant layer 3f side of the intermediate laminate 3E. Oppositely, the opening guide line part 6 is engraved at a depth that penetrates at least the base material layer 3d.

  Since the carbon dioxide laser beam is reflected by the metal, when the barrier layer 3b 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 3b.

  Thus, the opening guide line portion forming step S2 is completed.

  In addition, the opening guide line part 6 can form the opening guide line part of various shapes by changing the drawing line pattern of the opening guide line part processing machine into a predetermined shape.

Next, the punching laminate forming step S3 is performed. In this step, the intermediate laminate 3E is bonded to the adhesive layer 4
b, a part of or all of the paper layer 4a and the sealant layer 3g are laminated to form a punching laminate.

  First, the paper layer 4a is laminated | stacked through the contact bonding layer 4b on the base material layer 4c of the intermediate | middle laminated body 3E, and the base material layer 4c and the paper layer 4a are joined.

  Next, when part or all of the sealant layer 3f is not laminated in the intermediate laminate formation step S1, the sealant layer 3f is laminated and formed on the base material layer 3d or the ink layer 3e side.

  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 opening guide wire 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 material 5 and punching position identifying means for reading the tracking eye mark printed on the base material layer 3d of the punching laminate.

  For this reason, the punching position identifying means reads the tracking eye mark to move the position of at least one of the punching die and the punching laminate, and align the punching die and the opening guide line portion 6, The inner seal material 5 is punched from the punched laminate.

  Thereby, in this embodiment, the opening guide line part 6 is pulled out to the external shape determined so that it may come to a fixed position, 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 inside of the bottle 1 is filled with contents such as a powder seasoning or instant coffee. To do.

  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 so that the sealant layer 3f and the mouth end surface 1d of the mouth 1a are brought into contact with each other, and the paper layer 4a and the inner top surface 2a are brought into close contact with each other. In this state, the sealant layer 3f and the mouth end surface 1d of the mouth 1a are joined, and the paper layer 4a and the inner top surface 2a are joined.

  In the present embodiment, a high frequency seal is applied from the top surface side of the lid member 2, and the sealant layer 3f is welded to the mouth tip surface 1d of the mouth 1a.

  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 sealing material 5 is provided with the barrier layer 3b at a position covering the unsealing guide 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 mouth tip surface 1d, so that the inner seal material 5 has a joint surface between the lid member 2, the joint surface, and the mouth portion 1a. Therefore, a tensile force and a shearing force act, and a stress distribution is generated inside the inner seal material 5.

  In the present embodiment, the bonding strength between the upper surface 3A and the lower surface 4B of the upper sheet material 4 is smaller than the fitting strength between the lid member 2 and the inner seal material 5 and the adhesive strength between the inner seal material 5 and the container 1. Therefore, when the internal stress increases with the rotation of the lid member 2, the bonded state of these relatively low strength portions is destroyed.

  That is, the release layer 3a constituting the upper surface 3A and the resin layer 4d of the upper sheet material 4 are separated and separated.

  At this time, in this embodiment, since the unsealing guide wire portion 6 does not penetrate the barrier layer 3b, the unsealing guide wire portion 6 of the lower sheet material 3 is cut off together with the unsealing, and the barrier property cannot be maintained. .

  In this way, the barrier layer 3b is broken open by pushing the periphery of the opening guide wire portion 6 appearing on the lower sheet material 3 remaining on the container 1 into the container with a finger, and then the opening line is opened. The opening 1c can be obtained by expanding along the guide line 6.

  Further, when part or all of the sealant layer 3f is laminated in the punching laminate forming step S3, the unsealing guide wire portion 6 does not penetrate, but the sealant layer 3f has a shear strength of the separation line portion 6. Since the separation strength is low, both the separation portion 6 are easily broken.

  Thus, the lower sheet material 3 can remove the area surrounded by the opening guide line portion 6 and the outer periphery of the inner seal material 5, and the opening 1 c can be obtained in a part of the lower sheet material 3.

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 maintained when the lid member 2 is opened. The guide wire portion 6 can be easily opened by simply pushing the finger lightly and peeling it along the opening guide wire portion 6.
[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. 1 (a), the container sealing structure of this modification is applied to the container 1 side on the filling machine with glue glue to be the sealant layer 3f in the inner seal material 5 of the first embodiment. Work and seal.

  Hereinafter, a description will be given centering on differences from the first embodiment.

  In this case, as the base material layer 3d, adsorbability of glue glue and glassine paper are adopted.

The basis weight of the glassine paper, for ^{example, 15g / m 2 ~50g / m} 2 are preferred.

  In order to manufacture such an inner seal material 5, a punching laminate is formed in the same manner as in the first embodiment.

  In order to form a container sealing structure using the inner seal material 5, first, as in the first embodiment, the bottle 1 is filled with contents, and the inner seal material 5 is inserted into the lid member 2. .

  Before the lid member 2 is screwed into the mouth portion 1a, an aqueous adhesive called glue 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 to bring the glassine paper into close contact with the mouth end surface 1d of the mouth 1a, and to bring the paper layer 4a into contact with the inner top surface 2a. By leaving in this state for a certain period of time, the water-based adhesive is absorbed by the glassine paper and cured, and the glassine paper 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 paper, the front end surface 1d and the glassine paper are joined with the same joint strength as in the first embodiment. Can do. For this reason, in the same manner as in the first embodiment, even when the lid member 2 is removed, the sealed state can be maintained and the finger can be easily opened.
[Second Modification]
Next, an inner seal material according to a second modification of the present embodiment will be described.

  The inner seal material of the present modification is formed by punching with a blade instead of half-cutting with laser light in the opening guide line portion forming step S2 for applying the opening guide wire portion 6 of the inner seal material 5 of the first embodiment. Give.

  The unsealing guide wire portion 6 is formed in the same broken line or continuous line shape as the unsealing guide wire portion 6 of the first embodiment, and then the barrier layer 3b is laminated in the punching laminate forming step S3. Only the difference.

  According to the inner seal material 5 of this modification, a container sealing structure can be formed in the same manner as the inner seal material 5 of the first embodiment.

In this modification, since the barrier layer 3b is laminated after the opening guide line part forming step S2, the opening guide line part 6 can be processed by penetration processing, and processing adjustment becomes easy. However, since the opening guide line does not penetrate the adhesive layer 3c, the breaking strength of the opening guide line portion 6 may be increased. Therefore, the dry lamination method with a thin layer thickness is preferable for the adhesive layer 3c. In addition, when the pattern ink is provided adjacent to the release layer 3a, it is difficult to match the phase with the ink layer 3e.
[Third and fourth modifications]
Next, inner seal materials according to third and fourth modifications of the present embodiment will be described.

  The third and fourth modified examples are modified examples regarding the shape of the opening guide line portion 6 in the inner seal material 5 of the first embodiment.

  In the release layer, the coating pattern of the adhesive and the release agent may be changed.

  For example, it is also possible to improve the separation suitability of the upper sheet 4 and the lower sheet 3 by providing a difference in peel strength by changing the coating pattern between the outer part and the inner part of the inner seal material 5.

  In the above description, examples of the pattern coating pattern include a dot pattern and a peta pattern. However, these are only 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 the above description, the release layer 3a has been described as a laminate of a release agent and an adhesive, but the release agent 3a2 and the adhesive 3a1 are formed in a pattern that does not overlap each other. Thus, a single layered portion may be formed.

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

  In addition, the separation line portion is not limited to a configuration including a penetration portion and a non-cut portion. For example, if necessary separation can be obtained, it is possible to employ a separation line portion that is half-cut processed over the entire circumference of the closed curve pattern.

  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.

  Table 1 below shows the production conditions and evaluation results of Examples and Comparative Examples.

[Example 1]
Example 1 is an example corresponding to the inner seal material 5 of the fourth modified example of the first embodiment, and the cross-sectional configuration thereof is the same as that of the inner seal material 5 shown in FIG.

  The inner seal material 5 of this example was manufactured as follows.

  First, a base layer 3d made of biaxially stretched polyethylene terephthalate having a thickness of 12 μm and a barrier layer 3b made of aluminum foil having a thickness of 9 μm are laminated with an anchor coat by a melt extrusion method that is an adhesive layer 3c. A laminated film was prepared by laminating 15 μm polyethylene.

  Next, after solid-printing the pattern layer and the release varnish which becomes the release agent of the release layer 3a on the outer surface of the aluminum foil of the laminated film to a thickness of 2 μm with the ink for the aluminum foil, the release layer 3a Similarly, the adhesive varnish used as the adhesive was printed at a thickness of 2 μm and a dot pattern having a diameter of 0.5 mm at a pitch of 2 mm to form a release layer 3a. In parallel with this, the pattern layer used as the ink layer 3e was printed on the outer surface of biaxially-stretched polyethylene terephthalate using the ink for PET. These printings were performed by front and back simultaneous printing.

  Next, a 30 μm thick polyethylene layer serving as the resin layer 4d was laminated on the outer surface of the release layer 3a of the printed laminated film by a melt extrusion method, and a PET film layer was laminated as the base material layer 4c. An anchor coat was applied to the outer surface of the PET film on the back side on which the pattern layer was printed, and then a polyethylene layer having a thickness of 15 μm serving as a part of the sealant layer 3f was laminated. Thereby, the intermediate | middle laminated body 3E was formed (intermediate laminated body formation process S1).

  Next, a mountain-shaped pattern as shown in FIG. 2B is formed on the intermediate laminate 3E from the sealant layer 3f side by a dotted line pattern of 2.0 mm cut and 0.5 mm uncut from the carbon dioxide gas generator. The laser beam generated was applied, and the opening guide line portion 6 was formed by half-cut processing at a depth reaching from the sealant layer 3f to the adhesive layer 3c. Thereby, the broken-opening guide line part 6 was formed (opening guide line part formation process S2).

  Next, the outer surface of the base material layer 4c of the intermediate laminated body 3E on which the unsealing guide line portion 6 is formed and the coated cardboard having a basis weight of 310 g / m 2 that becomes the paper layer 4a are formed to have a thickness of 5 μm that becomes the adhesive layer 4b Were laminated with a wax adhesive having a thickness of.

  A hot melt adhesive was laminated as a multilayer of the sealant layer 3f.

  Thus, in the order of the lower surface 3B side, a sheet-like structure comprising hot melt / polyethylene / printing layer / biaxially stretched polyethylene terephthalate / polyethylene / aluminum foil / release layer / polyethylene / biaxially stretched polyethylene terephthalate / wax adhesive / paper layer. A punching laminate was produced (punching laminate forming step S3).

  Next, this punching laminate was punched into a disk shape having a diameter of 46 mm at a predetermined position to produce an inner seal material 5 (punching step S4).

  In this example, when the bonding strength between the release layer 3a and the resin layer 4d was measured, it was 0.4 N / 15 mm width. Here, the bonding strength was measured by 180 degree peeling.

  Next, the inner seal material 5 is loaded as a lid member 2 into a plastic cap made of polypropylene resin from the paper layer 4a side, and then the glass bottle (bottle 1) as an 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 and the upper sheet material 4 are separated and separated, the lower sheet with the release layer 3a and the barrier layer 3b exposed remains on the bottle side, All the layers of the sheet material 4 remained.

By pushing the periphery of the opening guide line portion 6 of the lower sheet material 3 into the container with a finger, the opening guide line portion 6 is broken, and subsequently, the opening end portion is pulled up above the bottle to the opening guide line portion 6. By peeling along, the lower sheet material 4 in the region surrounded by the opening guide line portion 6 and the inner seal can be easily separated and removed from the bottle side, and is opened in a state where a mountain-shaped opening is formed. I was able to.
[Example 2]
In Example 2, the processing step in the opening guide line portion forming step S2 for forming the opening guide line portion 6 is a laminated structure in which the barrier layer is not stacked, and after performing the penetrating process by the punching machine, the laminate for punching is formed. The difference from Example 1 is that the barrier layer is laminated in the process.

[Example 3]
[Example 4]
Examples 3 and 4 are examples corresponding to the inner seal material 5 of the third and fourth embodiments, and are different only in that the shape pattern of the opening guide line portion 6 as shown in FIG. 4 is changed. . [Comparative Example 1]
Comparative Example 1 is the same as Example 1 except that the opening guide wire portion 6 is not processed in Example 1.
[Comparative Example 2]
Comparative Example 2 is the same as Example 1 except that the processing depth of the unsealing guide wire portion 6 in Example 1 penetrates the barrier layer 3b.
[Evaluation]
The inner seal materials of each of the examples and comparative examples thus produced were evaluated for processability, barrier properties, reproducibility at dropping, openability, and take-out property of contents 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".

  Regarding the recyclability at the time of dropout, when the glass cap is filled with the contents and sealed, when the plastic cap is removed, the inner seal material falls off the fitting portion of the plastic cap and is transferred to the full-layer glass bottle. Assuming that, when only the upper sheet is peeled off from the release layer of the inner seal material and loaded into the plastic cap, `` ○ '' is indicated when the sealing performance inside the container is maintained, `` X ".

  The evaluation of unsealing is performed by using each inner seal material and plastic cap, filling the glass bottle with the contents and sealing, then removing the plastic cap and opening from the unsealing guide line. Was observed. When the opening can be smoothly opened and the outer portion of the lower sheet material separated from the lower sheet material remains in the mouth 1a after opening, and an opening is formed along the opening guide line portion. “O”, and “x” when a problem occurred.

The evaluation of the suitability for taking out the contents is based on the case where the contents are easily taken out from the opening after opening.
“O”, and “x” when a problem occurred.
[Evaluation results]
In Examples 1 to 4, as shown in Table 1, both workability and unsealing property were “◯”, and good workability and unsealing property were obtained.

  Since Examples 1 to 4 were similarly good in opening, it can be seen that there is a degree of freedom in the shape and arrangement of the inner part even when the screwed plastic cap is removed.

  However, about Example 2, the opening intensity | strength at the time of pushing and opening an opening guide line part with a finger was high compared with the other Examples 1, 3, and 4. This is presumably due to the fact that the opening guide line does not reach the adhesive layer 3c.

  However, in Example 4 in which the opening guide line is drawn in a closed curve, the content is suitable for taking out the contents because there is a difference in height between the inner wall of the glass bottle and the opening that opens along the opening guide line. Since there is a problem that it accumulates inside the sealing material and cannot be used up to the end, it is described as “Δ” because there is no major problem in practical use but an improvement is necessary.

  On the other hand, in the comparative example 2, since the unsealing guide wire penetrates the barrier layer, a defect occurred in the barrier property and the reproducibility at the time of dropping. The barrier property can be improved by providing a new barrier layer on the upper sheet material to which the unsealing guide line does not reach, but the improvement in the reproducibility at the time of dropping is impossible.

  In Comparative Example 1, since the opening guide wire is not installed, the glass bottle container outer periphery and the inner seal material outer periphery size are substantially the same for the convenience of loading even though the opening is performed from the end of the inner seal member. Because of its size, there was no picking allowance and it was difficult to open.

1 bottle (container)
1a Mouth portion 1b Screw projection 1c Opening 1d Mouth tip surface 1e Outer peripheral surface (outer shape of mouth portion)
1f Inner peripheral surface 2 Lid member 2a Inner top surface 2b Inner peripheral surface 2c Screw projection 3 Lower sheet material 3A Upper surface (surface on the upper sheet material side)
3B Lower surface (surface opposite to the upper sheet material)
3E Intermediate laminate 3a Release layer 3b Barrier layer 3c Adhesive layer 3d Base material layer 3e Ink layer 3f Sealant layer 4 Upper sheet material 4A Upper surface (one surface)
4B Lower surface (the other surface)
4a Paper layer 4b Adhesive layer 4c Base material layer 4d Resin layer 5 Inner seal material 6 Unsealing guide wire portion 6a Through portion 6b Uncut portion S1 Intermediate laminate forming step S2 Unsealing guide wire portion forming step S3 Punching laminate forming step S4 Punching process

Claims (6)

A container sealing structure for sealing the container by attaching a lid member having an inner seal material to the mouth of the container,
The inner seal material is
An upper sheet material whose one surface is fitted to the lid member;
Laminated on the other surface of the upper sheet material and bonded to the upper sheet material, and comprises a lower sheet material 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 the other surface on the upper sheet material side,
A container sealing structure in which an opening guide line is engraved at a depth that does not penetrate at least the barrier layer of the lower sheet material. The opening guide line extends from the two points on the outer edge of the inner seal material toward the inside of the product body and merges with each other, or substantially merges in a state in which a part is left uncut,
The lower sheet material is detachably joined to the mouth of the container,
The container sealing structure according to claim 1, wherein: The opening guide line part is
The container seal according to claim 1 or 2, wherein the plurality of weakened portions that are engraved and penetrated linearly are formed so as to form a broken line apart along the engraved pattern. Stop structure. The lower sheet material is
The aluminum foil is laminated | stacked as a barrier layer on the uppermost part of the thickness direction, The said opening guide line part was formed with the carbon dioxide laser processing machine, The any one of Claims 1-3 characterized by the above-mentioned. The container sealing structure described. The container sealing structure according to any one of claims 1 to 4, wherein a breaking strength of the opening guide line portion is 0.1 N / 15 mm or more and 2 N / 15 mm or less. An inner seal material used by attaching to a lid member 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;
Laminated on the other surface of the upper sheet material and bonded to the upper sheet material, and comprises a lower sheet material bonded to the mouth portion at the outer portion of the surface opposite to the upper sheet material,
The lower sheet material is releasably bonded to the other surface on the upper sheet material side,
An inner seal material, wherein an opening guide line is engraved at a depth that does not penetrate at least the barrier layer of the lower sheet material.