JP2018043780A - Inner seal material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner seal material which can reduces a force required for peeling a welded part during opening.SOLUTION: An inner seal material 10 is formed by laminating at least a sealant resin film 21, an aluminium foil 22, a foam resin sheet 23, and a surface resin film 25 and includes: a lid part 11 formed with a welded part 15 welded to an opening 1A of a container body 1; a folded part 12 which is provided at an outer edge 11A of the lid part 11 and folded from the outer edge 11A along the lid part 11; and a knob part 13 which spreads from a tip of the folded part 12 in a width direction and is disposed at the inner side of the welded part 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an inner seal material that seals an opening of a container body.

  Patent Document 1 discloses a lid member that closes an opening of a flexible container.

  The lid material is obtained by sequentially laminating a resin film layer, an aluminum foil, and a seal layer.

  The lid member includes a circular closing portion that is sealed so as to seal the opening of the flexible container, and a tab that is folded back from the closing portion.

  When sealing the opening of the flexible container with the lid material, a sealing layer is welded to the opening of the flexible container by a so-called high frequency seal.

  On the other hand, at the time of opening when the lid member is pulled away from the opening of the flexible container, the seal layer is peeled from the opening of the flexible container by the user holding the tab with a finger and pulling it upward.

JP 2014-19460 A

  When peeling the cover material of patent document 1 from an opening part, stress concentrates on the root part of the tab pulled by the user. The lid member is formed as a relatively thin member in which a resin film layer, an aluminum foil, and a seal layer are sequentially laminated. Therefore, from the viewpoint of the strength of the lid member, it is necessary to form a wide width at the base portion of the tab extending from the closed portion. As a result, since the stress when the tab is pulled by the user is dispersed, the force required to peel off the welded portion at the time of opening increases.

  An object of the present invention is to provide an inner seal material that can reduce the force required to peel off the welded portion at the time of opening.

  According to an aspect of the present invention, it is an inner seal material for sealing the opening of the container body, and is configured by laminating at least a sealant resin film, an aluminum foil, a foamed resin sheet, and a surface resin film, A lid portion formed with a welded portion to be welded to the opening of the container body; a folded portion provided on an outer edge of the lid portion and folded back along the lid portion from the outer edge of the lid portion; and the folded portion There is provided an inner seal material comprising: a knob portion that extends in the width direction from the tip of the metal plate and is disposed inside the weld portion.

  According to the above aspect, the inner seal material has sufficient strength even if the folded portion is formed in a relatively narrow band shape by the configuration in which the foamed resin sheet is laminated between the sealant resin film and the surface resin film. It can be secured. For this reason, since the stress at the time of peeling off the lid from the container body tends to concentrate on the root of the narrow folded portion, the welded portion of the lid can be peeled off with a smaller force.

  Further, since the folded portion of the inner seal material according to the present invention is folded inward along the lid portion from the outer edge of the lid portion, the outer edge of the inner seal material in the state where the folded portion is folded is the opening of the container body. It almost coincides with the outer edge of the part. Thereby, even when sealed by electromagnetic induction, the outer edge of the aluminum foil, which is the inner layer of the inner seal material, is uniformly heated, so that welding failure that may occur at the root portion of the folded portion can be suppressed.

FIG. 1 is a plan view of an inner seal material according to an embodiment of the present invention. 2 is a cross-sectional view of the inner seal material taken along line II-II in FIG. FIG. 3 is a perspective view showing a container body, an inner seal material, and a cap. FIG. 4 is a plan view of the inner seal material. FIG. 5 is a cross-sectional view of the container body, the inner seal material, the cap, and the like. 6A, 6B, 6C, and 6D are explanatory views showing a method of sealing the container main body with an inner seal material, respectively. 7 is a cross-sectional view taken along line VII-VII in FIG. FIG. 8 is a cross-sectional view showing a state at the time of opening. FIG. 9 is a perspective view including a container main body and a cap showing a modification of the inner seal material. FIG. 10 is a cross-sectional view of the inner seal material and the cap. FIG. 11 is a plan view showing another modification of the inner seal material.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a plan view of the inner seal material 10 as viewed from above. FIG. 2 is a cross-sectional view of the inner seal material 10. FIG. 3 is a perspective view showing a state in which the inner seal material 10 seals the container main body 1. The inside of the container main body 1 is filled with, for example, medicines and foods.

  As shown in FIG. 2, the inner seal material 10 is configured by sequentially laminating a sealant resin film 21, an aluminum foil 22, a foamed resin sheet 23, a printing layer 24, and a surface resin film 25. Thus, the inner seal material 10 is a laminated sheet composed of a plurality of layers.

  The sealant resin film 21 functions as a welding resin layer that is welded to the container body 1. The sealant resin film 21 is made of a heat-meltable resin that can be welded to the container body 1.

  The aluminum foil 22 functions as a metal barrier layer that blocks intrusion of moisture and gas. The aluminum foil 22 functions as a conductor that generates heat by electromagnetic induction when the sealant resin film 21 is welded to the container body 1.

  The foamed resin sheet 23 is a resin sheet including a foamed portion formed into a porous shape (including an open cell structure and a closed cell structure), and for example, a polyolefin foam is used. The foamed resin sheet 23 has the rigidity to keep the shape of the inner seal material 10 and the flexibility to bend the inner seal material 10 flexibly. Therefore, as will be described later, the user can handle the inner seal material 10 smoothly. Furthermore, the foamed resin sheet 23 functions as a heat insulating layer that suppresses the heat of the aluminum foil 22 from being transmitted to the cap 5 when the sealant resin film 21 is welded.

  Various displays and patterns are printed on the print layer 24. The inner seal material 10 may be configured not to have the print layer 24 when printing is not performed on the inner seal material 10.

  As the surface resin film 25, for example, a PET film (polyester film) is used. The surface resin film 25 is laminated outside the foamed resin sheet 23 and functions as a protective film that protects the surface of the inner seal material 10.

  As shown in FIG. 1, the inner seal material 10 includes a disk-shaped lid portion 11, a belt-like folded portion 12 extending from the outer edge 11 </ b> A of the lid portion 11, and a knob portion 13 that extends from the tip of the folded portion 12. . The inner seal material 10 is formed symmetrically about the center line O.

  FIG. 4 is a plan view of the state in which the inner seal material 10 seals the container body 1 viewed from the upper surface of the container body 1. In FIG. 4, a two-dot chain line is a virtual line indicating the inner edge of the opening 1 </ b> A of the container body 1. Further, the welded portion 15 formed in an annular shape along the outer edge 11 </ b> A is welded to the inner seal material 10 and the opening 1 </ b> A of the container main body 1 in a state where the container main body 1 is sealed by the inner seal material 10. Represents the part. Thus, the inside of the container main body 1 is sealed by welding the lower surface of the inner seal material 10 and the upper surface of the opening 1A of the container main body.

  The description will be continued with reference to FIGS. The folded portion 12 is formed in a belt shape having a substantially constant width, and is folded from the root portion along the upper surface 11B (outer surface) from the outer edge 11A of the lid portion 11. The folded portion 12 is folded so as not to protrude outward from the outer edge 11 </ b> A of the lid portion 11 by being folded from the root portion.

  The knob portion 13 is formed in a double leaf shape extending in the width direction from the tip of the folded portion 12. Here, the width direction of the folded portion 12 is a direction substantially orthogonal to the direction in which the folded portion 12 protrudes from the lid portion 11 (the direction in which the center line O extends).

  The knob 13 includes a base end edge 13 </ b> A from which the folded-back portion 12 extends and a concave edge 13 </ b> B that extends in a concave shape at the end opposite to the folded-back portion 12.

  The base end edge portion 13A is formed so as to extend along the inside of the opening 1A of the container body 1 in a state in which the folded portion 12 is folded from the root portion.

  The concave edge 13B is formed to be recessed in an arc shape. In addition, it is preferable that the concave shape of the concave edge portion 13B is formed as an arc shape having a radius of curvature equivalent to that of the outer edge 11A of the lid portion 11.

  FIG. 5 is a cross-sectional view showing a state in which the cap 5 is attached to the container body 1. The cap 5 is attached to the container main body 1 with the inner peripheral screw portion 5 </ b> C screwed into the outer peripheral screw portion 1 </ b> C of the container main body 1.

  A reseal material 9 is fitted in the back of the cap 5 in advance. The disc-shaped reseal material 9 has an outer peripheral end 9 </ b> A engaged with the annular convex portion 5 </ b> B of the cap 5. The top surface 9 </ b> B of the reseal material 9 contacts the top plate portion 5 </ b> A of the cap 5.

  The inner seal material 10 is fitted in front of the reseal material 9 inside the cap 5. At this time, the knob portion 13 is located inside the welded portion 15 (center side in FIG. 5) via the folded portion 12 and is accommodated between the lid portion 11 and the cap 5. Thus, the inner seal material 10 is disposed below the reseal material 9 with the folded portion 12 and the knob portion 13 folded back on the upper surface 11B of the lid portion 11.

  Then, by tightening the cap 5, the lower surface 11 </ b> C of the lid portion 11 is pressed against the opening 1 </ b> A of the container body 1 by the top plate portion 5 </ b> A of the cap 5.

  Next, FIGS. 6A to 6D are diagrams showing a procedure for sealing the container body 1 via the inner seal material 10 and the cap 5.

  First, a large number of inner seal materials 10 are cut out from the laminate material 20 having the laminated structure shown in FIG. 2 by a cutting machine (not shown).

  At this time, as shown in FIG. 6A, each inner seal material 10 is laminated so that the concave edge portion 13B of the knob portion 13 faces the outer edge 11A of the lid portion 11 of the adjacent inner seal material 10. Cut out from 20. Thereby, in the laminate material 20, the intervals at which the inner seal materials 10 are arranged can be made close to each other. Thereby, in the cut-out process from the laminate material 20, the amount of waste material generated between the adjacent inner seal materials 10 can be suppressed, so that a larger number of inner seal materials 10 can be created from one laminate material 20. .

  Subsequently, as illustrated in FIG. 6B, the folded portion 12 is folded from the outer edge of the lid portion 11 so that the upper surfaces of the folded portion 12 and the knob portion 13 overlap the upper surface of the lid portion 11.

  Subsequently, as shown in FIG. 6C, the reseal material 9 and the inner seal material 10 are assembled inside the cap 5.

  Subsequently, as shown in FIG. 6D, the cap 5 is attached to the container body 1 filled with the contents, and the inner seal material 10 is welded to the opening 1 </ b> A using the electromagnetic induction heater 32.

  The electromagnetic induction heater 32 is disposed immediately above the cap 5 and applies an electromagnetic force generated in the coil to the inner seal material 10 via the cap 5. In the inner seal material 10, an eddy current is generated in the aluminum foil 22 by the electromagnetic force of the electromagnetic induction heater 32, and heat is generated from the outer peripheral end of the aluminum foil 22. As a result, the sealant resin film 21 at the portion in contact with the heated aluminum foil 22 is melted, so that the sealant resin film 21 and the opening 1A of the container body 1 are welded.

  Here, the eddy current flowing through the aluminum foil 22 by the electromagnetic force of the electromagnetic induction heater 32 has a property of flowing in the circumferential direction along the outer shape (outer periphery) of the aluminum foil 22, and the outer peripheral end portion of the sealant resin film 21 is annular. Heat to.

  By the way, in the shape of the lid member as described in Patent Document 1, since the width of the base of the folded tab is wide, when the tab is folded, particularly the circumferential end of the folded tab is circular. Projects outward from the outer edge of the. For this reason, since the eddy current generated by electromagnetic induction flows along the outer shape of the lid member after the tab is bent through the part protruding outward from the circular outer edge, the outer periphery of the lid member is annularly formed. It becomes impossible to heat uniformly. As a result, the melt of the sealant resin film becomes insufficient at the root end of the folded tab, particularly at the circumferential end, and the inner seal material and the opening are difficult to weld, resulting in poor welding near the end of the tab base. May occur.

  On the other hand, in the inner seal material 10 according to the present invention, since the folded portion 12 is narrow and folded from the outer edge 11A of the lid portion 11, the base portion of the narrow folded portion 12 having a narrow width is a circular outer edge 11A. Do not protrude outward from For this reason, even after the folded-back portion 12 is folded, the lid portion 11 maintains the shape of the circular outer edge 11A. That is, the folded portion 12 does not have a portion that protrudes outward from the circular outer edge 11A when folded from the root. Thereby, since the eddy current generated by the electromagnetic induction flows along the outer periphery of the aluminum foil 22, the welded portion 15 is uniformly heated in an annular shape, so that the welding is poor at the root portion of the folded portion 12 of the sealant resin film 21. The generation of the portion is prevented, and the opening 1A is reliably sealed.

  As described above, the opening 1 </ b> A of the container body 1 is sealed with the inner seal material 10 and the cap 5.

  FIG. 7 is a side cross-sectional view showing the state of the opening 1 </ b> A of the container body 1 after the user removes the cap 5 from the container body 1. In this state, in the inner seal material 10, the lid portion 11 is fixed to the opening portion 1 </ b> A via the welded portion 15, and the inner space of the container body 1 is sealed.

  FIG. 8 is a cross-sectional view showing an operation in which the user removes the inner seal material 10 from the container body 1. The user pulls the knob portion 13 to peel the welded portion 15 from the opening 1A and pull the lid portion 11 apart.

  The above operation will be described in detail. First, the user can insert the finger 6A between the lid part 11 and the knob part 13 by raising the folded part 12 and the knob part 13, and can pick the knob part 13 with the two fingers 6A and 6B.

  Subsequently, the user pulls up the knob 13 with the finger 6A placed in the opening 1A via the lid 11 as a fulcrum. As a result, as indicated by an arrow A in FIG. 8, the tensile force concentrates on the narrow folded portion 12, so that the force necessary to peel off the welded portion 15 can be reduced as compared with the conventional case. Thus, the user can easily open the container body 1.

  Next, the effect of this embodiment will be described.

  According to the present embodiment, the inner seal material 10 seals the opening 1A of the container body 1, and the inner seal material 10 includes at least a sealant resin film 21, an aluminum foil 22, a foamed resin sheet 23, and a surface resin. A film 25 is laminated. Furthermore, the inner seal material 10 is provided on the lid portion 11 where the welded portion 15 to be welded to the opening 1A of the container body 1 is formed, and the outer edge 11A of the lid portion 11, and extends along the lid portion 11 from the outer edge 11A. A folded portion 12 that is folded back, and a knob portion 13 that extends in the width direction from the tip of the folded portion 12 and that is disposed inside the welded portion 15 are provided.

  Based on the above configuration, the inner sealing material 10 is formed by laminating the foamed resin sheet 23 between the sealant resin film 21 and the surface resin film 25, so that the folded portion 12 is formed in a relatively narrow band shape, Sufficient strength can be secured. And since the width | variety of the folding | returning part 12 is narrowly formed, it becomes easy to concentrate the force with which a user pulls the knob | pick part 13 at the time of opening at the root part with a narrow width | variety of the folding | returning part 12, Therefore The force required when peeling 15 can be made smaller.

  Further, the folded portion 12 of the inner seal material 10 does not protrude outward from the circular outer edge 11 </ b> A of the lid portion 11 in a state of being folded from the outer edge 11 </ b> A of the lid portion 11. Therefore, the outer shape of the lid portion 11 after the folded portion 12 is folded back from the base is a circular shape as indicated by the outer edge 11A. As a result, eddy currents generated during sealing by electromagnetic induction uniformly flow in an annular manner around the circular outer edge 11A of the lid portion 11, so that no poor welding of the lid portion 11 occurs at the root portion of the folded portion 12 or the like. The opening 1A can be reliably sealed.

  Furthermore, the inner seal material 10 is formed such that the width of the knob portion 13 is larger than the width of the folded portion 12. Further, the rigidity of the knob portion 13 is ensured by the foamed resin sheet 23. For this reason, since visibility is high and it is excellent in the ease of handling, a user tends to pick the knob | pick part 13. FIG.

  The knob 13 has a concave edge 13B that is curved in a concave shape at the end opposite to the side where the folded-back portion 12 extends, and the shape of the concave edge 13B is the same as the shape of the outer edge 11A of the lid 11. The configuration is almost the same.

  By configuring in this way, as shown in FIG. 6A, it is possible to reduce the interval at which a plurality of inner seal materials 10 are cut out from the laminate material 20 side by side. The number of inner seal materials 10 that can be produced can be increased. In other words, the amount of waste material after the inner seal material 10 is cut out from the laminate material 20 can be reduced. Therefore, the yield of the laminate material 20 is improved, and the manufacturing cost of the inner seal material 10 can be suppressed.

  Next, a modified example of the inner seal material 10 shown in FIGS. 9 to 10 will be described.

  FIG. 9 is a plan view of the state in which the inner seal material 10 seals the container body 1 as viewed from the upper surface of the container body 1. The inner seal material 10 includes a claw portion 14 that protrudes from the outer edge 11 </ b> A of the lid portion 11.

  The pair of claw portions 14 are formed in a piece shape extending outward in the radial direction of the lid portion 11. The claw portion 14 is bent downward from the outer edge 11 </ b> A of the lid portion 11 and is fitted inside the cap 5. The claw portion 14 has a width equal to or smaller than the width of the folded portion 12. The nail | claw part 14 is set to the protrusion amount and area of the grade which does not produce a welding defect at the time of sealing by electromagnetic induction.

  FIG. 10 is a cross-sectional view showing a state in which the inner seal material 10 is mounted in the cap 5. The inner seal material 10 is fitted in front of the reseal material 9 inside the cap 5, and the claw portion 14 engages with the inner peripheral screw portion 5 </ b> C of the cap 5. Thereby, the state in which the inner seal material 10 is assembled inside the cap 5 is maintained. In addition, the site | part with which the nail | claw part 14 engages is not restricted to the inner periphery screw part 5C of the cap 5, The other site | part which protrudes from the inner periphery of the cap 5 may be sufficient.

  Furthermore, the inner seal material 10 includes a fixing portion 19 that welds a part of the folded portion 12 to the upper surface 11B of the lid portion 11. The fixing portion 19 is a portion where a portion where the folded portion 12 and the lid portion 11 overlap is welded by, for example, ultrasonic vibration using a welding machine (not shown). When welding is performed by ultrasonic vibration, the surface resin films 25 are welded to each other at the fixing portion 19, so that the folded portion 12 and the lid portion 11 are welded instantaneously.

  When the inner seal material 10 is mounted in the cap 5, since the folded portion 12 is joined to the lid portion 11 by the fixing portion 19, the folded portion 12 and the knob portion 13 are located on the inner peripheral side of the outer edge 11A. The state folded so that it may overlap with the cover part 11 is maintained. Thereby, the folding | returning part 12 and the knob | pick part 13 are prevented from being pinched between the outer periphery screw part 1C of the container main body 1, and the inner periphery screw part 5C of the cap 5. FIG. Thus, the work of assembling the inner seal material 10 into the cap 5 is performed smoothly. Further, when the inner seal material 10 is handled, the folded portion 12 and the knob portion 13 move unnecessarily, thereby preventing damage or the like caused by applying an excessive load to the root of the folded portion 12 or the like. .

  Moreover, since the adhering portion 19 joins the belt-like folded portion 12 to the lid portion 11, it does not hinder the user from picking the knob portion 13, and the user peels off the lid portion 11. For this reason, when the knob portion 13 is pulled, it is easily peeled off, so that the opening operation by the user is not hindered.

  The fixing portion 19 may be configured to weld a part of the knob portion 13 to the upper surface 11B of the lid portion 11. Further, the fixing part 19 may be a part to which an adhesive is applied, and a part of the folded part 12 or the knob part 13 may be fixed to the upper surface 11B of the lid part 11 via an adhesive.

  Further, the inner seal material 10 may have a display 16 indicating the position of the knob 13 on the lid 11. The display 16 may be printed on the upper surface of the surface resin film 25 or may be printed on the print layer 24.

  The user removes the cap 5 from the container body 1 and looks at the display 16 indicating the knob 13 in the lid 11, so that the visibility of the knob 13 is enhanced, and the user is prompted to pull the knob 13 to open. . Therefore, even an elderly person or a child can perform the operation of pulling the knob 13 without hesitation.

  Next, a modified example of the inner seal material 10 shown in FIG. 11 will be described.

  The inner seal material 10 of the present modification includes three claw portions 14 and a notch portion 13C that opens at the center of the concave edge portion 13B of the knob portion 13. The inner seal material 10 is cut out adjacent to the laminate material 20 so that the concave edge portion 13B and the notch portion 13C of the knob portion 13 face the outer edge 11A of the adjacent lid portion 11 and one claw portion 14. . In this case, the notch portion 13 </ b> C is recessed along the claw portion 14, so that the interval between the adjacent inner seal materials 10 can be kept small. Thereby, the quantity of the waste material produced between the adjacent inner seal materials 10 can be suppressed.

  In addition, the inner seal material 10 is not limited to the above-described configuration, and the arrangement of the claw portions 14 is arbitrarily set. Further, the inner seal material 10 may be configured to include one or four or more claw portions 14. Further, the inner seal material 10 may be configured not to have the claw portion 14.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

DESCRIPTION OF SYMBOLS 1 Container main body 1A Opening part 1C Outer peripheral thread part 5 Cap 5C Inner peripheral thread part 10 Inner seal material 11 Lid part 11A Outer edge 12 Folded part 13 Pick part 13B Concave edge part 14 Claw part 16 Display 19 Fixing part 20 Laminate material 21 Sealant resin Film 22 Aluminum foil 23 Foamed resin sheet 25 Surface resin film

Claims (5)

An inner seal material for sealing the opening of the container body,
At least a sealant resin film, an aluminum foil, a foamed resin sheet, and a surface resin film are laminated and configured.
A lid portion on which a welded portion to be welded to the opening of the container body is formed;
A folded portion provided on an outer edge of the lid portion and folded back along the lid portion from the outer edge of the lid portion;
An inner seal material, comprising: a knob portion that extends in a width direction from a tip of the folded portion and is disposed inside the weld portion. The inner seal material according to claim 1,
An inner seal material further comprising a fixing portion for fixing a part of the folded portion or the knob portion to an upper surface of the lid portion. The inner seal material according to claim 1 or 2,
The knob portion has a concave edge extending in a concave shape at the opposite end of the folded portion,
The inner edge seal material, wherein the concave edge portion has a shape substantially coincident with the outer edge of the lid portion. The inner seal material according to any one of claims 1 to 3,
The said cover part has an indication which shows the position of the said knob | pick part, The inner seal material characterized by the above-mentioned. The inner seal material according to any one of claims 1 to 4,
An inner seal material further comprising a claw portion protruding outward from an outer edge of the lid portion.

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