JP4210825B2 - Cap with heat seal lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screw cap having a heat seal lid for sealing a plastic bottle, a tube-shaped container, or a container mouth such as a pouch with a spout or a metal container with a heat sealable material.
[0002]
[Prior art]
Conventionally, a synthetic resin cap has been improved in sealing function by mounting a liner or packing on the inner surface of the cap top surface or by providing an inner ring. However, for example, in a plastic tube or a pouch with a spout filled with a highly functional retort food or the like that has been distributed recently as a highly fragrant content such as wasabi or a pouched food with a spout, as shown in FIG. The mouth 40 is heat-sealed and sealed with a heat-sealing lid 41 in which an aluminum foil is coated with a thermoplastic resin so as to further improve the sealing performance. In this case, when the cap is opened, the outer screw cap 42 must be removed and then the heat seal lid 41 serving as the inner lid must be picked and peeled off. For this reason, there was an inconvenience that the inner lid peeled off was troublesome and separated from the cap as unnecessary.
[0003]
On the other hand, a heat-seal lid that can be heat-sealed on both sides is sealed by heat-sealing both the inner surface of the screw cap top surface and the container mouth. There has been proposed one that peels from the mouth (Japanese Utility Model Laid-Open No. 56-166279). After heat-sealing the heat-seal lid to the container mouth, put the screw cap on it, bond the top surface of the screw cap and the top surface of the heat-seal lid with hot melt, and unscrew the screw cap when opening. There has been proposed one in which the heat seal lid is automatically peeled off (Japanese Patent No. 3020104). Alternatively, it consists of three pieces: a screw cap, an inner plug, and a heat seal lid. By heating the heat seal lid with high frequency induction when the container is sealed after the screw cap is mounted, one side of the heat seal lid is heated with the inner surface of the top plate of the inner plug. Sealing and heat-sealing the other side to the top of the container, and then heat-sealing so that the adhesion to the top of the stopper is stronger than that of the top of the container. After unscrewing, there has been proposed an inner plug integrated with a heat seal lid that is peeled off from a container mouth (Japanese Utility Model Laid-Open No. 5-71155).
[0004]
[Problems to be solved by the invention]
Among the above-mentioned proposals, the former one peels off the heat seal lid due to the difference between the adhesive force between the upper surface of the heat seal lid and the inner surface of the top surface of the screw cap and the adhesive force by heat sealing between the upper surface of the container mouth. Therefore, there is a problem that a large twisting force must be applied to the entire heat seal lid at the time of peeling, and a large opening torque is required. In addition, the following is devised so that opening can be done in one step, but the sealing step requires two steps because the heat seal lid and screw cap must be mounted separately as in the conventional case. There is a point. Furthermore, in the latter case, a heat seal lid is mounted in advance in the screw cap, and after the screw cap is mounted on the container mouth and screwed, heat sealing can be performed by high frequency induction heating. There is a problem that becomes.
[0005]
As described above, in a cap composed of a combination of a heat seal lid that heat-seals the container mouth and seals the container mouth, and a screw cap that is an outer lid, the heat seal lid can be removed by attaching and removing the screw cap. A device that can be attached and detached at the same time and that can be opened in one step without requiring a large opening torque has not been known. Therefore, a problem to be solved by the present invention is to provide a cap with a heat seal lid that satisfies these requirements.
[0006]
[Means for Solving the Problems]
  The cap with a heat seal lid of the present invention that solves the above-mentioned problems is a cap with a heat seal lid that adheres to the top of the container and seals the container mouth, and is suspended from the top wall and the top wall and placed on the inner peripheral surface. A cap body having a skirt wall having a threaded portion that is screwed with a screw of the mouth portion, and a heat seal lid that is fitted and supported between at least the threaded portion end of the cap body and the inner peripheral surface of the top wall. The heat seal lid has a heat seal layer on at least the lower surface, is made of an elastic material having an outer diameter larger than the outer diameter of the container mouth and projecting from the outer periphery of the container mouth, and on the inner peripheral surface of the skirt wall Has a peeling means to engage with the protrusion of the heat seal lid,The heat seal lid is composed of a multilayer sheet having a support layer having rigidity at least on the upper surface and a seal layer capable of heat sealing on the lower surface of the container top,The cap body is screwed onto the container mouth and heated to bond the heat seal lid to the top of the container mouth.The peripheral edge of the heat seal lid is elastically deformed from the outer peripheral side of the container mouth by being lifted according to the lead angle of the screw, engaged with the lower surface of the protruding portion of the heat seal lid and pushed upward. The force to peel toward the inner circumference actsThe heat seal lid can be peeled off.
[0007]
The heat seal lid is constituted by a multilayer sheet having a support layer having rigidity on at least the upper surface and a seal layer capable of heat sealing on the lower surface of the container. And by comprising from the multilayer sheet which has metal foil between the said support layer and a sealing layer, this metallic layer is heated by high frequency induction heating, and the sealing layer can be effectively heat-sealed with the heat. In addition, the shape is not limited to a disk shape, and it can be formed in a shape having an annular middle leg that fits with the inner peripheral surface of the container mouth.
[0008]
  As the peeling means for peeling the heat seal lid by unscrewing the cap body at the time of opening, an annular protrusion or a plurality of protrusions formed in an annular shape so as to have an inner diameter smaller than the outer diameter of the heat seal lid. It is effective to form.
[0009]
  However, the peeling means for peeling the heat seal lid is not limited to this, and it is also possible to serve as an end portion of the screw portion formed on the inner peripheral surface of the skirt wall.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the cap 1 with a heat seal lid according to the present invention is composed of a cap main body 2 and a heat seal lid 10 mounted inside the cap main body 2. The material of the cap body 2 may be any elastic material that is rigid so that the cap is not greatly deformed by the force applied at the time of closing, and any material can be used among metals, ceramics, synthetic resins, and the like. . Synthetic resins include linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene, ethylene copolymer, polymethylpetene resin, polyester or polyester resin, liquid crystal polyester, polyamide or copolyamide resin, polystyrene Resin, polycarbonate, polyvinyl chloride, methacrylic acid resin and the like can be used. Used alone or in a blend of multiple types of resins. Moreover, in order to give rigidity, dimensional stability, heat resistance, etc. to these resins, you may mix inorganic fillers, such as a titanium oxide, a calcium carbonate, and carbon, as needed.
[0011]
On the other hand, the container to which the cap 1 with the heat seal lid of the present invention is attached is only required to have a container mouth portion into which the cap is screwed, and the shape and material of the container body such as a bottle shape and a pouch shape are as follows. Although it does not matter in particular, at least the sealing surface of the container mouth part is a resin having heat sealability, or a synthetic resin container formed by coating a heat sealable resin or laminating a heat sealable resin film, a metal container, glass Containers, paper containers, or ceramic containers are preferred. However, the sealing surface of the container mouth portion is not necessarily limited to the resin having heat sealing properties, and the material constituting the container may be directly exposed as long as the heat sealing lid can be heat sealed. The resin having heat sealability may be any thermoplastic resin, for example, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-α-olefin copolymer, polypropylene, propylene- Ethylene copolymer, ethylene-vinyl acetate copolymer, ionomer, relatively low melting point to low softening point polyamide or copolyamide resin, polyester or copolyester resin, polycarbonate resin, etc. Blend and use. Moreover, in order to give rigidity, dimensional stability, heat resistance, etc. to these resins, you may mix inorganic fillers, such as a titanium oxide, a calcium carbonate, and carbon, as needed.
[0012]
Fig.1 (a) shows the cap 1 with the heat seal lid | cover which concerns on embodiment of this invention, and has shown the case where it applies to the pouch which has a container mouth part (spout) 20 as shown in the same figure (b). In the cap 1 with a heat seal lid of the present embodiment, the cap body 2 is formed of a synthetic resin selected from the above resins. The cap body 2 includes a skirt wall 5 having a top wall 3 and a threaded portion 4 that is suspended from the top wall and is threadedly engaged with a screw of the container mouth portion 20 on the inner peripheral surface. A tamper evidence band (hereinafter referred to as a TE band) 7 is provided through the. On the inner peripheral surface of the TE band 7, a TE band fixing flap 8 that engages with the engaging convex portion of the container mouth portion 20 is formed so as to be able to hinge at the base portion.
[0013]
And the cap main body 2 of this embodiment is the cap of the heat seal lid | cover 10 before mounting to a container so that it may be located in the skirt wall inner peripheral surface between the upper end part of the screw part 4, and the top wall 3 inner surface. An annular projection 9 is formed to prevent separation from the main body and serves as a peeling means for the heat seal lid 10 when the cap is opened, and the heat seal lid 10 is mounted between the annular projection 9 and the top wall 3. . The annular protrusion 9 is not horizontal but is inclined at a predetermined angle (for example, the same angle as the lead angle of the screw portion) with respect to the top wall surface. As will be described later, only the upper surface of the annular protrusion 9 is turned by turning the cap body 2 when opening the cap. It hits the lower surface of the protrusion 16 of the heat seal lid 10 and gradually peels from the outer peripheral side of the container mouth toward the inner peripheral side along the circumferential direction according to the rotation. As a result, the opening torque is reduced. In addition, the distance between the upper surface of the annular protrusion 9 and the inner surface of the top wall 3 is an addition of at least the thickness t of the heat seal lid 10 and the amount by which the cap body is raised by the cap rotation until the bridge 6 is broken. It is formed to be a distance. Thereby, when the plug is opened, the bridge 6 is always destroyed before the heat seal lid 10 is peeled off, thereby improving the tamper evidence. And, as shown in the figure, the annular projection 9 has a cross-sectional shape in which the inclined surface 9 has a tapered lower surface.₁When the cap is assembled, the heat seal lid 10 can be easily attached, and the locking portion 9 having a flat upper surface is provided.₂Thus, it is formed so as to be easily engaged with the protruding portion 16 of the heat seal lid 10 at the time of opening.
[0014]
The heat seal lid 10 is basically formed of a material that can be heat-sealed with the container mouth portion 20 at least on the lower surface, and one end of the annular protrusion 9 is attached to the heat seal lid when the cap body 2 is rotated when the cap is opened. 10 is engaged with the lower surface of the projecting portion 16 and raised according to the lead angle of the screw, so that when the projecting portion 16 of the heat seal lid 10 is pushed upward, the peripheral edge thereof is elastically deformed and the container opening It needs to be formed of a material having rigidity that allows a force to peel from the outer peripheral side toward the inner peripheral side, and is composed of a seal layer and a support layer.
[0015]
FIG. 2 schematically shows three typical embodiments of the heat seal lid 10. Heat seal lid 10 of the embodiment shown in FIG.₁Is a support layer 11 having a rigid upper layer portion.₁Seal layer 12 that can be heat sealed to the lower layer₁Is a multilayer structure in which the layers are bonded together. Heat seal lid 10 shown in FIG.₂The support layer 11₂And sealing layer 12₂The metal foil layer 13 is interposed between the two and has a multilayer structure. Further, the heat seal lid 10 shown in FIG._ThreeIs the support layer 11_ThreeA cylindrical middle leg 14 corresponding to an inner ring in a normal cap is formed on the lower surface of the container, and a seal layer 12 capable of heat-sealing with the container mouth on the lower surface of the support layer outside the middle leg._ThreeAnd the layers are bonded together. In addition, when including any member shown with the extraction code | symbol which attached | subjected the subscript in these three embodiment, it represents with the extraction code | symbol which excluded the subscript.
[0016]
In the heat seal lid 10, the seal layer 12 is composed of a single layer or two or more layers. In the case of a single layer configuration, a heat seal of a heat-sealed seal portion is formed by forming the seal layer with a resin different from the resin constituting the seal layer using paraffin wax and the seal surface of the container mouth. Utilizing the fact that the strength is small and it becomes an easily peelable seal. For example, when the resin constituting the sealing surface of the container mouth portion 20 is polypropylene, linear low density polyethylene is used for the sealing layer. On the other hand, when the resin constituting the sealing surface of the container mouth portion 20 is linear low density polyethylene, polypropylene is used for the sealing layer.
[0017]
Alternatively, by forming a seal layer with a blend resin in which an incompatible resin is added to the same kind of resin as the resin that forms the seal surface of the container mouth portion 20, the heat-sealed seal portion is blended with a non-phase. Depending on the type and blending ratio of the soluble resin, it is utilized that it becomes an easily peelable seal having easy interface peelability or easy cohesive failure. In this case, for example, when the resin constituting the sealing surface of the container mouth portion 20 is a polyethylene resin, the blend resin constituting the seal layer may be polyethylene and polypropylene resin, polyethylene and polybutene resin, polyethylene and propylene- Friend-based resins such as α-olefin copolymers may be mentioned. On the other hand, when the resin constituting the sealing surface of the container mouth portion 20 is a polypropylene resin, the blend resin constituting the seal layer is polypropylene and polyethylene resin, polypropylene and ethylene-α-olefin copolymer, polypropylene and cyclic resin. Examples thereof include blend resins such as olefin copolymers.
[0018]
However, the present invention is not limited to the above examples, and low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-α olefin copolymer, polypropylene, propylene-ethylene copolymer, propylene-α olefin copolymer Polymer, polybutene, butene-α olefin copolymer, acid-modified olefin resin, polymethylpentene resin, ethylene-propylene-diene copolymer, polystyrene resin, ionomer resin, ethylene-pinyl acetate copolymer, ethylene-vinyl acetate A resin that is incompatible with the resin that constitutes the sealing surface of the container mouth portion 20 is selected from resins such as a copolymer saponified product, and the compounding ratio between these and the resin that constitutes the sealing surface of the container mouth portion 20 By making the sealing layer with the resin system blended while adjusting, it is easy to peel off from the container mouth 20. It may be a sealing layer capable of forming a sex seal.
[0019]
On the other hand, when the sealing layer is multi-layered, the first layer (outermost surface) of the sealing layer is made of the same kind of resin as the resin that forms the sealing surface of the container mouth portion 20 and cannot be peeled off from the container mouth portion 20. -Tossed. It becomes a mechanism for opening by breaking the first layer and peeling between the first layer and the second layer. The second layer is composed of a resin different from the resin constituting the first layer, or is composed of a blended resin obtained by adding an incompatible resin to the same type of resin as the resin constituting the first layer. . In the former case, the peeling mode of the first layer and the second layer is interfacial peeling. In the latter case, the form of peeling between the first layer and the second layer can be arbitrarily adjusted from interfacial peeling to cohesive peeling depending on the type and blending ratio of the incompatible resin to be blended.
[0020]
The support layer 11 of the heat seal lid 10 is more heat resistant than the seal layer 12 so as not to melt or deform during high frequency induction heating. When the heat seal lid 10 is lifted at the time of opening, the heat seal lid 10 is bent to peel off the seal portion. Therefore, the support layer 11 is made of a flexible material. Specifically, polypropylene, linear low density polyethylene, high density polyethylene, polymethylpentene resin, cellophane, polyester or copolyester resin, polyamide or copolyamide resin, polycarbonate, polyester resin, polyvinyl chloride, methacrylic resin. An acid resin or the like is used. Alternatively, inorganic fillers such as titanium oxide, calcium carbonate, and carbon may be mixed with these resins in order to impart rigidity, dimensional stability, heat resistance, and the like.
[0021]
Further, when the metal foil layer 13 is provided on the heat seal lid 10, the metal foil layer 13 acts as a heating element during high-frequency heating, and specifically, metal foil such as aluminum foil, steel foil, tin foil, etc. is adopted. it can.
[0022]
When manufacturing the heat seal lid 10 having the above layer structure, for example, the support layer 11, the metal foil layer 13, and the seal layer 12 are laminated by known methods such as dry lamination, melt extrusion coating, sand lamination, and thermo lamination. Can be done by the method. Further, an adhesive resin layer such as an epoxy resin, a urethane resin, a polyethyleneimine resin, or a polyolefin resin into which a polar group is introduced may be interposed between the layers as necessary.
[0023]
The heat seal lid 10 made of the material as described above has an adhesion with the material of the container mouth portion 20 substantially in the range of 1 to 25 N per 15 mm width in T peel peel strength, and the heat seal layer 12 and the above The support layer 11 is configured such that the thickness t (mm) and the flexural modulus M (Mpa) satisfy the condition of an elastic body in the range of 30 <t × M <3000. The heat seal force must have both openability and sealability, and it is desirable that the T peel strength of the bonded portion be within the above range. At the time of plugging, the peel strength is high and the screw cap opening torque is increased, resulting in poor plug opening performance. On the other hand, when t × M is 30 or less, the rigidity of the seal lid 10 is small and deforms when it is peeled off, so that the force to break the seal portion cannot be exhibited. Conversely, when it is 3000 or more, there is almost no deformation of the lid when the heat seal lid 10 is peeled off, and a force for breaking the seal portion is required for the entire sealing surface, and the opening strength is increased.
[0024]
In addition, the cap 1 with a heat seal lid in the embodiment shown in FIG. 1 has a diameter b of the heat seal lid 10, an annular protrusion inner diameter c of the cap body, and a thread diameter d between the container mouth top outer diameter a. It is formed so that the dimensional relationship satisfies the following conditions (1) to (2). (1) The difference between the diameter b of the heat seal lid 10 and the outer diameter a at the tip of the container mouth, that is, the outer periphery of the heat seal lid 10 protrudes outward from the container mouth 20 after heat sealing, and is engaged with the annular protrusion 9 The width of the portion to be the portion is at least twice as large as the heat seal lid thickness t and within 4 times the container mouth portion thickness s, that is, 2t <ba <4s, and (2) the annular protrusion 9 The gap e = (c−a) / 2 with the outer diameter of the container mouth is smaller than 4t, that is, e <4t.
[0025]
Among the above conditions, (1) is that the annular projection 9 of the cap body defines the engagement width of the heat seal lid 10 at the time of opening, and affects the peelability of the heat seal lid 10 at the time of opening. (2) defines the width in which the annular protrusion 9 cannot engage with the annular protrusion 9 in the engagement width of the heat seal lid 10, and directly affects the peelability of the heat seal lid 10. The gap between the annular protrusion 9 and the outer diameter of the mouth is designed so that its minimum value is in the range of 0.05 to 3 mm. If the gap between the annular protrusion 9 and the outer diameter of the mouth portion is 0.05 mm or less, the annular protrusion 9 comes into contact with the thermal sag of the top surface of the container mouth portion that occurs during heat sealing, and a sufficient peeling effect is obtained. There is a risk of not. Further, if the clearance is 3 mm or more, the protruding portion 16 on the inner peripheral surface of the skirt as a peeling means passes through the outer peripheral portion of the heat seal lid without breaking the seal portion due to the bent state of the support layer, and can be opened. There is a risk of disappearing.
[0026]
The cap 1 with a heat seal lid of the present embodiment is configured as described above, and in order to attach the heat seal lid 10 to the cap body 2 in the cap manufacturing process, for example, as shown in FIG. The heat seal lid 10 supplied into the cap main body so as to be in the lower side can be easily assembled by pushing it in with a cylindrical pusher 25 having a predetermined diameter. That is, when the outer peripheral surface of the heat seal lid 10 comes into contact with the annular protrusion 9, as shown in FIG.₁And bends over the annular projection 9. When the heat seal lid 10 gets over the annular projection 9, it returns to a flat plate shape due to its own elasticity, and further, the pusher rises, so that the upper surface of the support layer of the heat seal lid 10 is lifted as shown in FIG. The cap body is pressed and fitted to the inner surface of the top wall. The cap 1 with the heat seal lid thus assembled is screwed into the container mouth 20 of the container filled with the contents in the same manner as in the normal capping process, and when the screwing is completed, the cap is heated at the heating station. When heated from the outside by high frequency, the sealing layer 12 of the heat seal lid 10 and the top of the container are melted and heat sealed, and the container mouth 20 is sealed.
[0027]
FIG. 4 shows the opening mechanism of the container sealed as described above. FIG. 2A shows a state before opening, and in this state, the upper surface of the annular protrusion 9 of the cap body 2 and the lower surface of the heat seal lid 10 are separated by a predetermined distance. Therefore, even if the cap is rotated in the opening direction in this state, the annular projection 9 as the peeling means does not peel off the heat seal lid 10 immediately, and the cap main body rotates by a predetermined angle as shown in FIG. The peeling of the heat seal lid 10 is started only after the bridge is broken (c). Therefore, according to the present embodiment, it is possible to completely prevent the TE band 7 from being broken without breaking the TE band 7 by unauthorized opening, and the tamper evidence can be improved. When the cap body 2 is further rotated, the annular protrusion 9 pushes up the protruding portion 16 of the heat seal lid 10 and gradually peels from the outer peripheral side of the container mouth toward the inner peripheral side. Therefore, the cap opening torque can be reduced compared to the conventional case where the inner surface of the top surface of the cap body and the upper surface of the heat seal lid are adhered and the cap body is rotated to peel off the entire surface at once. Can do.
[0028]
In the above embodiment, the annular protrusion 9 is provided on the cap body 2 as the peeling means of the heat seal lid 10, but the present invention is not necessarily limited to the annular protrusion, and a plurality of intermittently formed as shown in FIG. The protrusion 15 may be used. Further, as shown in FIGS. 5C and 5D, the shape of the upper surface of the annular protrusion is not flat, and may be a shape having a convex protrusion 17 or a raised portion. Furthermore, the end portion of the screw portion formed on the inner peripheral surface of the skirt wall may also serve as the peeling means.
[0029]
FIG. 6 is another embodiment in which a cap with a heat seal lid according to the present invention is applied to a bottle-shaped metal container, and the basic form of the cap with a heat seal lid has the same structure as the above embodiment. Since these can be adopted, the same reference numerals are given and detailed description is omitted. When applied to the metal container 30, when the high frequency sealing is performed at the time when the screwing is completed, the container mouth portion 31 generates heat to promote the melting of the seal layer 12 of the heat seal lid, and the seal layer, the container mouth portion, Is heat sealed to seal the container mouth. In addition, in this case, when a heat seal lid having a metal foil layer as shown in FIG. 2B is adopted, both the metal foil layer and the metal container mouth are heated at the same time to form a seal layer. 12 is melted and heat sealed.
[0030]
【Example】
The container mouth 20 and the cap 1 with a heat seal lid adopt the structure shown in FIGS. 1 (a) and 1 (b), and the container has a spout for a screw-type pouch with an outer diameter of the container mouth top of 10.5 mm. Was molded from polypropylene. The cap 1 with a heat seal lid was formed such that an annular protrusion 9 for engaging with the protrusion 16 of the heat seal lid 10 was formed on the inner peripheral surface of the skirt wall so that the inner diameter c of the tip was 10.8 mm. In addition, a TE band 7 is formed in the lower part of the skirt so that the bridge 6 can be cut before the seal is released at the time of opening in order to have a tamper evidence. The heat seal lid 10 employs the structure shown in FIG.₂A non-oriented polypropylene sheet having a thickness of 0.25 mm, an aluminum foil having a thickness of 7 μm on the metal layer foil 13, and a sealing layer 12.₂Further, a 30 μm thick heat-sealable synthetic resin layer based on a propylene polymer was punched into a disk having a diameter of 11.8 mm. Seal layer 12 used here₂Was easy to heat seal with polypropylene or the like, and the seal strength by T-peel peeling when heat sealed with polypropylene was 12 N / 15 mm, causing cohesive failure.
[0031]
And the sealing layer 12₂In a direction that adheres to the top of the container₂Was inserted into the cap top surface of the cap body 2 and assembled to obtain a cap 1 with a heat seal lid. The obtained cap 1 with a heat seal lid is screwed into the container mouth portion 20, and the heat seal lid 10 is obtained by high frequency induction heating.₂The container opening 20 was sealed by heating the aluminum foil. In order to inspect the sealed state of the cap-equipped container mouth part 20 obtained in this way, pressure was applied by air to the inner surface side of the container mouth part 20, and the leak condition was examined in water. Was confirmed.
[0032]
Further, in order to measure the open state, the container mouth portion 20 was attached to a torque meter, and the cap was manually rotated in the opening direction. As a result, the probe 6 of the tumbler evidence band 7 was cut before releasing the seal. When further rotated, the heat seal lid 10₂As the cap body 2 rotates, the heat seal lid 10 increases.₂In the state where the cap 1 with the heat seal lid 1 is unscrewed and separated from the container mouth portion 20.₂Was completely peeled from the container mouth portion 20 and could be removed from the container mouth together with the cap body 2. The peak measured value of the opening torque at that time was 20 to 29 N · cm. This opening torque value was in a good range as the force required to open the container having the outer diameter of the cap. With the above embodiments, the effectiveness of the present invention has been confirmed and the initial object has been achieved.
[0033]
【The invention's effect】
As described above, according to the cap with a heat seal lid of the present invention, in a cap comprising a combination of two pieces of a heat seal lid that heat-seals the container mouth and seals the container mouth and a screw cap that is an outer lid. The heat seal lid can be attached to the container mouth integrally with the screw cap, and then the container mouth can be automatically sealed with the heat seal lid by heating from the outside, and the cap body is rotated when the cap is opened. By simply removing the heat seal lid from the container mouth, it can be opened in one action, and the opening performance can be improved. Moreover, when the cap is opened, the heat seal lid is peeled off by pushing up the protruding part of the heat seal lid with a peeling means provided on the cap body, so that the heat seal lid can be easily peeled off without requiring a large opening torque. Can be easily opened.
[0034]
In addition, when the cap body has a TE band, the bridge of the TE band is broken before the seal is released by the peeling means, so that the tamper evidence performance can be improved.
[0035]
In addition, the heat seal lid is formed of an elastic material having at least a heat seal layer and a support layer, and is bonded with a heat seal force that achieves both openability and sealability. .
[Brief description of the drawings]
1A is a cross-sectional view of a cap with a heat seal lid according to an embodiment of the present invention, FIG. 1B is a front view of a container mouth portion, and FIG. 1C is a view with a cap with a heat seal lid attached to the container mouth portion. It is sectional drawing in the state which carried out.
2A to 2C are schematic cross-sectional views showing various embodiments of a heat seal lid according to the present invention.
FIGS. 3A to 3G are process diagrams showing a capping process of the embodiment of FIG. 1;
FIGS. 4A to 4D are diagrams showing the process of opening the plug, and FIG. 4E is an explanatory view showing a peeling principle.
5A is a cross-sectional view taken along line AA in FIG. 1A, FIG. 5B is a cross-sectional view corresponding to another embodiment, and FIG. 5D is a cross-sectional view taken along line BB in FIG. It is.
FIG. 6 is a cross-sectional view of a main part showing a state where the cap with a heat seal lid according to the embodiment of the present invention is attached to a metal container.
7A is a cross-sectional view of a conventional cap with a heat seal lid, and FIG. 7B is an explanatory view showing a peeling form of the conventional heat seal lid.
[Explanation of symbols]
1 Cap with heat seal lid 2 Cap body
3 Top wall 4 Screw part
5 Skirt wall 6 Bridge
7 TE band 9 Annular projection
10 Heat seal lid 11 Support layer
12 Seal layer 13 Metal foil layer
16 Projection 20, 31 Container mouth
30 Metal container

Claims (5)

A cap with a heat seal lid for adhering to a container mouth top to seal the container mouth, and a skirt wall having a top wall and a screw part that hangs down from the top wall and is screwed to a screw of the container mouth on the inner peripheral surface A cap body comprising a heat seal lid fitted and supported between at least the end of the threaded portion of the cap body and the inner peripheral surface of the top wall, and the heat seal lid has a heat seal layer on at least the lower surface The outer diameter of the skirt wall is larger than the outer diameter of the container port and has a protruding portion protruding from the outer periphery of the container port, and the skirt wall inner peripheral surface has a peeling means that engages with the protruding portion of the heat seal lid. And the heat seal lid is composed of a multilayer sheet having a support layer having rigidity at least on the upper surface and a seal layer capable of heat sealing on the lower surface of the container top,
When the cap body is screwed to the container mouth and heated, the heat seal lid is adhered to the top of the container mouth, and when the cap body is opened, the cap body is unscrewed so that the peeling means has a screw lead angle. The peripheral edge of the heat seal lid is elastically deformed from the outer peripheral side of the container mouth toward the inner peripheral side by engaging with the lower surface of the protruding portion of the heat seal lid and pushing it upward. A cap with a heat seal lid, which is configured so that the heat seal lid can be peeled by the action of a peeling force.   The cap with a heat seal lid according to claim 1, wherein the heat seal lid is composed of a multilayer sheet having a metal foil between the support layer and the seal layer.   The cap with a heat seal lid according to claim 1 or 2, wherein the peeling means is an annular protrusion or a plurality of protrusions formed in an annular shape so as to have an inner diameter smaller than the outer diameter of the heat seal lid.   The cap with a heat seal lid according to claim 1 or 2, wherein the peeling means also serves as a screw end portion formed on the inner peripheral surface of the skirt wall.   The cap with a heat seal lid according to any one of claims 1 to 4, wherein the heat seal lid has an annular middle leg that fits with an inner peripheral surface of a container mouth portion.

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