JP4807381B2 - Easy-to-open container lid with resealability and method for producing the same - Google Patents

Description

  The present invention relates to an easily openable container lid and a method for manufacturing the same, and in particular, with a partial open type container lid, provided with an opening resealing property capable of temporary resealing such as temporarily resealing an opening once opened. The present invention relates to an easily openable container lid and a manufacturing method thereof.

  Easy-open container lids (easy open lids) are widely used as food container lids for food cans, beverage cans, etc., which include beverage cans containing various beverages such as cola, beer, and juice. There are partial open type container lids mainly used for can lids, and full open type container lids mainly used for can lids of canned foods such as canned foods, instant noodles and snacks.

  In addition, the partially open type container lid has a pull top tab type in which the easily breakable opening piece is peeled off and completely separated from the container lid by opening and a part of the easily breakable opening piece is connected to the container lid. There is a steion tab type of which the broken opening piece is not separated from the container lid even after opening by pushing into the container.

  However, the so-called pull-top tab type, in which the opening piece is completely separated from the container lid, not only pollutes the environment as garbage, because the separated opening piece has a sharp fracture surface, etc. In recent years, the above may cause damage to fish, birds, animals, etc., even if it is accidentally thrown away, which may cause accidental harm to infants who use it, or if it is scattered in nature. Steion tab-types that do not have such problems are often used.

Such a container lid is strongly required to have resistance to internal pressure and corrosion resistance, in particular, no elution into the contents, depending on the nature of the contents as well as easy opening and sealing.
For this reason, a lid body made of a laminate material that is conventionally high strength, flexible, and excellent in corrosion resistance, particularly a laminate material in which a base material such as a metal foil or a resin thin plate is coated with a non-eluting resin, Many tabs are used.

  For example, Patent Document 1 discloses a laminate having heat-sealability on a base material (thermoplastic resin) serving as a lid having an opening, for the purpose of enhancing the easy-opening property and barrier property and enhancing the internal pressure strength. An easy-opening lid characterized in that the adhesive strength of the laminate is stronger than the interlayer adhesive strength of the laminate, and the tensile strength of the adhesive layer is weaker than the interlayer adhesive strength of the laminate Is disclosed.

  Further, in Patent Document 2, an opening piece made of a metal foil laminate coated with a double-sided resin and an opening formed in advance and a resin-coated metal plate lid body whose peripheral edge is protected with a specific structure are thermally bonded. An invention of an easily openable container lid is disclosed.

Japanese Patent Laid-Open No. 11-011526 Japanese Patent Publication No. 60-1216

However, the partial open type steion tub container lid has become very popular in this way, and this container lid has resealability, and once opened, the inside of the container is temporarily fixed temporarily. There has been a growing demand for the provision of an easily openable container lid that can be resealed for some time or can be retorted with the lid attached.
However, it is said that the easy-open container is originally used only once, and can be opened only once, and resealing (resealing) of the container lid opening after opening has not been considered in the past. It's not too much to say.

In fact, as far as the present inventors have investigated, no proposal of an easily openable container lid for the purpose of resealing the opening once opened has been found.
However, in order to re-seal the container lid substantially without leakage and safely and reliably, a certain degree of opening hermeticity is required at the time of resealing, and the lid that has been opened at least once and then resealed. It is particularly important from the standpoint of mischief and crime prevention to ensure that the lid can still be easily distinguished from the unopened lid and that the contents of the can can be easily obtained without change. .

  In the case of the conventional resin-coated metal foil tab or opened piece already described and resealed using it, the sealability is hardly obtained or even if the sealability at the time of resealing is obtained, The above-mentioned purpose cannot be sufficiently achieved because it is difficult to identify the unopened package.

  As a result of intensive research aimed at solving the above-mentioned problems, the present inventors have provided a plug member that can be fitted to the opening of the lid on the opening tab that is an opening piece, so that the resealability is sufficient. The present invention has been completed on the basis of the finding that it can be easily achieved, and the identification of already opened and unopened can be easily performed.

  Accordingly, an object of the present invention is to provide an easily openable container lid with resealability, in particular, a partially open type lid with a stay-on-tab. It is an object of the present invention to provide an easily openable container lid which has an opening resealability that can be repeatedly stopped and has a resealing property that is remarkably superior to that of a configuration in which the opening is covered only with a resin-coated tab.

Another object of the present invention is to ensure that a lid that has been opened at least once and then resealed can be easily distinguished from a lid that has not yet been opened, and that the contents of the individual cans have not been changed without knowledge. An object of the present invention is to provide an easily openable container lid that can be easily obtained.
Another object of the present invention is to provide a container lid that can form an easily openable container having significantly improved pressure resistance and drop strength compared to conventional products.
Still another object of the present invention is to provide a container lid that has a significantly improved easy-openability because the adhesion area at the periphery of the opening can be reduced.

Further, another object of the present invention is to provide an easily openable container lid that is hygienic and excellent because the opening piece does not enter the can as in the case of a conventional lid with a stay-on-tab.
Still another object of the present invention is to provide a method for producing an easily openable container lid having the resealability.

According to the present invention, a lid member having an opening formed in advance and an opening tab that is provided on the outer surface side of the lid member so as to cover the opening and to be hermetically bonded at the periphery of the opening. In the openable container lid, the opening tab includes a flexible tab member made of a laminate in which a resin film is formed on both surfaces of a metal foil, and an adhesive unit integrated with the tab member, and an opening portion of the lid member A plug member formed so that it can be fitted to the lid member, and has a portion attached to the lid member that is difficult to detach and located on the opposite side across the opening from the opening start end, and for opening even after opening The tab is configured not to be detached from the lid member, and is a portion immediately before the portion that is difficult to remove from the lid member, and is notched from both sides in a direction substantially perpendicular to the peeling direction, and the tab width of the portion. a shape is narrowed, and the flexible tab The material is closely fixed in a peelable manner at the periphery of the lid member opening, and the edge of the opening is edge-treated by bending or curling to the outside of the lid, or resin coating. An easily openable container lid with resealability is provided.

  The easy-open container lid of the present invention has a shape structure in which an opening tab (opening piece) is composed of a flexible tab member portion and a plug member portion, and the plug member is fitted into the opening of the lid member. In addition, the tab member is bonded and integrated with the tab member, while the flexible tab member is peelable and hermetically sealed at the periphery of the lid member opening.

Since the opening tab has the above-mentioned specific structure, the easy-open container lid of the present invention can be easily temporarily re-sealed any number of times by pushing the plug into the opening even after opening once. Resealability much better than when the opening is covered only with the film-coated metal foil tab (tape tab).
However, since the bonding area at the opening portion is a small area only at the peripheral edge of the opening, the bonding strength can be made relatively small, so that the opening property is improved.

In addition, once opened and then resealed and still unopened lids can be easily distinguished from their respective shapes, ensuring that individual can contents have not been altered without your knowledge. It is done.
Furthermore, the specific configuration of the easy-open container lid greatly improves the pressure resistance and drop strength of the container as compared with the conventional one.

In the container lid of the present invention, the opening edge of the lid member is bent or curled to the outside of the lid, or the edge edge treatment is performed by resin coating. It is not sharp and is protected from corrosion.
However, since the fitting familiarity with the plug member of the opening tab is good and the plug member is not damaged even if resealing is repeated, the fitting state can be maintained long and favorable, which is preferable.

  The flexible tab member is preferably a laminate having a resin film formed on both sides of a metal foil in view of the balance between tensile strength and flexibility at the time of tab tearing and corrosion resistance.

The lid member is preferably a metal member having a winding portion at the peripheral edge.
It is preferable that the lid member has thermal adhesiveness at least on the outer surface side with respect to the flexible tab member and that the inner surface side is non-adhesive with respect to the flexible tab member and the plug member. This is particularly desirable from the viewpoint of ensuring both adhesion to the plug member and non-elution to the contents.
In addition, in addition to the flexible tab member, the opening tab further has a plug member bonded to the periphery of the opening of the lid member, particularly under severe conditions such as high temperature and impact. It is more preferable from the viewpoint of ensuring the tightness of the exposed container.

The opening tab is located on the opposite side of the opening from the opening start end and has a portion that is attached to the lid member so that it is difficult to remove, and the opening tab does not detach from the lid member even after opening. A container lid, in particular, a container lid configuration in which the both sides are notched in the direction substantially orthogonal to the peeling direction and the tab width of the portion is narrowed immediately before the portion attached to the lid member It is preferable because the progress of peeling is easily stopped.
The plug member is preferably a resin plug member formed by injection molding or compression molding or a metal plug member formed by press molding.

The present invention is also a method for manufacturing an easily openable container lid having resealability according to the present invention, wherein the edge processing of the opening of the lid member having a previously formed opening is performed. A step of forming a tab for opening by integrating a flexible tab member and a plug member having a shape in which the tab width of the portion is narrowed in a direction substantially perpendicular to the peeling direction and the tab width of the portion is reduced; The opening tab is applied to the surface, the flexible tab member and the lid member outer surface at the periphery of the opening, and the opening tab from the lid member to the position on the opposite side of the opening from the opening start end. There is provided a process for producing an easily openable container lid, characterized by comprising a step of adhering so as to form a part adhering to difficulty .
Further, the manufacturing method of the aspect in which the opening tab is formed by integrally forming the plug member on the flexible tab member by injection molding or compression molding can form the opening tab shape of the present invention accurately and efficiently. Particularly preferable from the viewpoint.

As described above, the container lid of the present invention has an opening resealability of a container that has been opened once, which is not found in a conventional easy-open container lid, and can easily identify unopened and already opened.
Furthermore, the easy-open container using the lid of the present invention is superior in terms of easy-openability, pressure resistance, drop strength characteristics, and hygiene compared to conventional containers.
However, since the shape is flat as a whole and there is no high unevenness in the vertical direction, even if a large number of the lids of the present invention are stacked at the same time, there are many advantages such as relatively stable and excellent so-called stackability.

  Hereinafter, an easily openable container lid having resealability according to the present invention and a manufacturing method thereof will be described in detail with reference to the drawings.

1 to 4 are perspective views for explaining the overall configuration of the easy-open container lid according to the present invention. FIG. 1 shows main components of the container lid in a state before assembly, and FIG. Indicates a state in which the container lid is opened.
FIG. 3 shows the same main components before assembly of the container lid of the present invention as in the case of the container lid shown in FIGS. 1 and 2 except that some member shapes are different. FIG. 4 shows the unopened state of the container lid and its The cross-sectional structure of the lid in a state is shown.

As apparent from FIGS. 1 and 2, the container lid of the present invention includes a lid member 1 shown as a whole and an opening tab 2 shown as a whole.
The lid member 1 has a pre-formed opening 1 a, the unsealing tab 2 includes a flexible tab member 2 a and a plug member 2 b, and the plug member 2 b fits into the opening 1 a of the lid member 1. Thus, in the case of the container of this figure, it is formed in a substantially frustoconical shape, and the bottom surface side is bonded to the portion represented by reference numeral 2d of the flexible tab member 2a.
The opening tab 2 covers the opening 1a of the lid member 1 and is provided so that the peripheral portion of the opening 1a and the flexible tab member 2a of the tab 2 are hermetically bonded.

In this container lid, the opening tab 2 is adhered only to the flexible tab member 2a. However, not only the flexible tab member 2a but also the plug member 2b can be adhered. A thing is preferable from a viewpoint which can ensure not only the airtightness at the time of unopening of the container exposed to severe conditions, such as high temperature and an impact, but a favorable airtightness including the airtightness at the time of resealing.
The unsealing tab 2 has a portion that is firmly coupled to the lid member 1 on the opposite side of the opening from the unsealing start end 2f in a state where it is disposed on the opening 1a of the lid member 1. In the case of the container lid shown in the figure, three lines of curls are formed in the portion.

The three-curl curl shape is also provided at a corresponding position on the lid member 1, and the two members are firmly bonded and fixed by bonding the curls of the two.
Thus, the tab 2 is not detached from the lid member 1 even after the opening tab 2 is peeled off from the opening start end 2f and the container is opened (see FIG. 2: Steion tab type).

The container lid shown in FIGS. 3 and 4 includes a lid member 1 ′ and an opening tab 2 ′. The lid member 1 ′ has an opening 1a ′, and the opening tab 2 ′ is a flexible tab member 2a. 1 and the plug member 2b '. The plug member is formed so as to be fitted into the opening 1a' and is integrally bonded to the flexible tab member 2a 'in the same manner as the container shown in FIGS. .
Also in this container lid, the opening tab 2 ′ covers the opening 1 a ′, and its peripheral portion and the flexible tab member 2 a ′ are provided in close contact with each other.
However, the container lid is not provided with the curl of the container shown in FIGS. 1 and 2, and the bonding portion between the lid member 1 ′ and the flexible tab member 2a ′ is a flat surface.
Instead, in the container lid of FIGS. 3 and 4, the flexible tab member 2a ′ is cut out from both sides at the portion 2c ′ immediately before the adhesive fixing portion of both members, so that the peeling progress stops here. It is configured.

In order to open the easy-open container lid of the present invention, the tab 2 (2 ′) is opened at its opening start end while holding the knob 2e (2e ′) of the opening tab 2 (2 ′) with a finger. 2f (2f ') is pulled to the near side to peel off the opening 1a (1a') of the lid member 1 (1 '), and the tab 2 (2') and the lid 1 (1 ') are fixed and bonded to each other. Stop in front of the part.
The resealing after the opening once is performed by re-inserting the plug into the opening by pressing the upper surface of the bonding portion 2d (2d ′) of the plug member 2b (2b ′) of the opening tab 2 (2 ′).

An important feature of the container lid of the present invention is that a plug member having a shape that fits into the opening is attached to the opening tab.
When this plug member is slightly thick, the resilience and the like at the time of resealing are strong, and the reseal sealing performance is much better than when the opening is covered only with a conventional tape tab.

  The plug member of the present invention is not necessarily limited to this, but a resin plug and a metal plug can be preferably used.

Resin plugs that are flexible, have high sealing elasticity, and can be resealed more frequently in containers that are used at relatively low temperatures, containers that contain corrosive contents, and containers that do not require high pressure resistance. On the other hand, high strength and high temperature resistance is required for containers that are exposed to particularly high temperatures, such as hot filling and retort processing, containers that require particularly high pressure resistance performance, or containers whose plug member thickness is limited, etc. Use of a good metal or resin-coated metal plug is preferred.
In the case of a resin plug, it is important that the elution to the contents is low, and in the case of a metal plug, it is important that the contents have corrosion resistance.

  Resin materials used for such resin plugs include polyolefin resins such as polypropylene and high-density polyethylene, polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene terephthalate isophthalate, 6 nylon, 6, 6 Examples thereof include polyamides such as nylon and blended compositions thereof.

  In addition, examples of the metal material used for the metal plug include aluminum and steel. In the case of a laminated metal plug, as the laminate material, at least the surface side in contact with the flexible tab member is a constituent material of the member. It is necessary to use, for example, polypropylene or the like, and the surface side that comes into contact with the lid member is excellent in fitting and sealing properties with respect to the lid opening end and protects the contents, for example polyester The use of polyamide or the like is preferred.

  When the plug member is made of resin, the molding method may include injection molding or compression molding, and the bonding with the flexible tab member is appropriately performed according to the respective materials. Adhesion with an agent or thermal adhesion may be used.

On the other hand, in the case of a metal plug member, it is formed by press molding or the like.
Further, it can be formed simultaneously by insert molding when manufacturing the opening tab.
As a constituent material of the flexible tab member to which the plug member is bonded, an opening piece or a tab constituent material which is usually used for this kind of container lid and is necessarily a material which can be joined to the plug material. Although not limited, a laminate comprising a resin film formed on both sides of a metal foil is particularly preferred from the viewpoint of the balance between tensile strength and flexibility at the time of tab tearing and corrosion resistance.

  Specific examples of such a laminated material include a laminated material obtained by laminating PET on one side of an aluminum foil and PP on the other side.

Next, the lid member of the present invention will be described in more detail.
In the lid member of the present invention, the edge of the opening is directed toward the outside of the lid member as indicated by reference numeral 1g ′ in FIG. 5 which is an enlarged cross-sectional view of the opening edge of the lid member of FIG. Folded into a smooth curved surface, or curled at the edge, or coated with resin in a ring shape with PET, PP, etc., as shown in FIG. 6, and formed into a smooth curved shape without sharp edges Even if the lid edge after opening is smooth and inadvertently touches this part, there is no risk of damage such as cuts, and it is protected from corrosion, etc. Since the fitting familiarity with the plug member of the opening tab is good, it is preferable that a good fitting state can be maintained for a long time, for example, the plug member is not damaged even if resealing is repeated.
In addition, it is more preferable that the lid member has a tightening portion at the peripheral portion so that hermetic joining with the can body portion can be performed by the tightening processing.

  Further, in the case where the outer surface side of the lid member surface is at least thermally bonded to the flexible tab member and the plug is also bonded, it is preferable that the plug member is also thermally bonded. It is particularly desirable for the side to be non-adhesive to the flexible tab member and the plug member from the viewpoint of ensuring both adhesion to the flexible tab member and plug member and non-elution to the contents.

  In the following, various specific examples will be given for the bonding mode between the opening edge of the lid member of the container lid of the present invention and the flexible tab member of the opening tab and the fitting mode of the plug member. This will be described in detail.

FIG. 7 is a plan view (a), a cross-sectional view (b), an example of the container lid (unopened) of the present invention when a resin plug is used, and an adhesion portion between the opening edge and the flexible tab member; It is the elements on larger scale (c) for demonstrating the fitting sealing aspect of an opening edge and a plug member.
In the container lid of FIG. 7, the opening edge 1 i is bent so as to form a smooth curved surface toward the outer surface side (upper side in the figure) of the lid member 1, and the fitting sealing surface is indicated by a symbol C. It is directed toward the center of the covered portion, that is, the lid.
In this mode of fitting, sealing is mainly maintained by the radial rebound resilience of the resin plug member.
And in the container lid of this figure, the flexible tab member 2a is adhere | attached on the lid member 1 in A part.

FIG. 8 is a plan view (a) a sectional view (b) and a partially enlarged view (c) showing another example of the container lid of the present invention similarly using a resin plug. The fitting part (sealing part) of 1i is shown with the code | symbol C, and the surface has faced the peripheral direction of the lid | cover.
The lid member 1 is bonded to the flexible tab member 2a and the A portion, and to the plug member 2b and the B portion.
In the fitting of this aspect, even when the container lid is heated, the plug at the portion sandwiched between the edge of the flexible tab member 2a (near the inclined portion in the figure) and the opening edge 1i. Since the expansion of the member is suppressed, the sealing is difficult to be damaged, and even if the reseal is repeated, the occurrence of creep of the plug resin is delayed, and the elastic durability is excellent.

FIG. 9 is a plan view (a), a sectional view (b), and a partially enlarged view (c) showing an example of the container lid of the present invention when a metal plug is used.
In the container lid of FIG. 9, the opening edge 1 i is bent toward the outside (upward) of the lid member 1, and its fitting sealing surface is in the center direction of the lid, as indicated by reference numeral C. It is suitable.
And in the container lid of this figure, the cover member 1 is adhere | attached by the flexible tab member 2a and A part.

On the other hand, FIG. 10 is a plan view (a), a sectional view (b), and a partially enlarged view (c) of another example of a container lid when a metal plug is used. The 1i fitting sealing surface (portion C) is directed toward the peripheral edge of the lid.
The lid member is bonded to the flexible tab member at the portion A.

  In the case of the container lid of the embodiment shown in FIG. 8, the plug member is made of resin and the fitting sealing surface faces the outer peripheral edge direction of the lid. For example, the assembly process diagram and the method shown in FIG. 11 can be exemplified.

  That is, in this manufacturing method, first, the opening edge portion 1i of the lid member 1 provided with the opening 1a is bent toward the outer surface side (the upper side in the drawing) so as to form a smooth curved surface, and the edge processing is performed. (End molding).

On the other hand, the raw material (PET / Al / PP laminated sheet) of the flexible tab member 2a of the opening tab 2 is formed into the tab shape (see FIGS. 8A and 8B) (tab forming).
A plug member 2b forming resin (PET) is integrally formed in the tab member 2a by injection molding or compression molding to the formed flexible tab member 2a to produce the opening tab 2 (plug insert molding).

Next, the plug 2b of the opening tab 2 is annealed (plug annealing), and then the predetermined adhesive portions of the flexible tab member 2a and the plug member 2b of the opening tab 2 are bonded to the lid member edge 1i. Let (adhesion).
After completion of the bonding, a finishing process such as edge processing of the edge 2i of the opening tab is performed to obtain a finished product (completed).

  FIG. 12 is an assembly process diagram showing another method for manufacturing the resin plug container lid of the same mode as in FIG. 11. The method of FIG. 11 is different from the method of insert injection molding of the plug 2b and the lid of the flexible tab member 2a. The difference is that the bonding to the body opening end 1i and the bonding of the plug member 2b to the lid opening end are carried out almost continuously and sequentially, and then annealing is performed.

FIG. 13 is an assembly process diagram showing still another manufacturing method of the resin plug container lid of the same mode as FIG. 11. In this method, insert injection molding of the plug 2b and adhesion to the lid member opening edge 1i are performed. After the plug 2b bonded to the lid member 1 is annealed separately from the molding of the flexible tab member 2a, the separately molded flexible tab member 2a is connected to the plug 2b and the lid member opening end. 1i is bonded to each, and then finished to finish.
FIG. 14 is also an assembly process diagram showing still another manufacturing method of the resin plug container lid of the same mode as FIG. 11. In this method, the opening edge 1i of the lid member 1 is processed, the plug member 2b is molded and annealed. The flexible tab member 2a is individually molded, and the plug member 2b is first fitted into the lid opening end 1i, and then the lid member 1, the plug 2b, and the flexible tab member 2a are bonded to each other, Finish to make the finished product.
Further, in the case of the container lid of the embodiment shown in FIG. 9 in which the plug member is made of metal and the fitting sealing surface faces the center direction of the lid, for example, the assembly process diagram, manufactured by the method illustrated in FIG. I can do it.

  That is, in this method, the opening edge 1i processing (end molding) of the lid member 1, the metal plug member 2b molding (plug molding), and the flexible tab member 2a molding (tab molding) are performed individually, and first the metal plug 2b is fitted into the lid opening end 1i (end to plug fitting), and its sealing property is inspected. Then, the flexible tab member 2a is bonded, and finally finished to obtain a finished product.

  FIG. 16 is an assembly process diagram showing another method of manufacturing the metal plug container lid of the same mode as FIG. 15, and in this method, the opening edge 1i of the individually formed lid member 1 and the metal plug member 2b Of the flexible tab member 2a, first, the plug member 2b and the flexible tab member 2a are temporarily bonded, and then the temporarily bonded plug member 2b and the flexible tab member 2a are permanently bonded and the lid is closed. Adhere to the member 1 to obtain a finished finished product.

  Further, in order to form the flexible tab member of the opening tab of the present invention from a material sheet such as a laminated sheet, for example, as shown in FIG. , 1st process; Blanking (drilling), 2nd process; Blanking (cutting forward), 3rd process; Paneling (extension), 4th process; Curling (bending shrinkage), 5th process; Blanking (cutting out) It processes and shape | molds in order of a process.

  In addition, regarding the bending method of the curved shape of the opening edge of the lid member to be fitted with the plug member of each aspect, the process order of the preferred aspect is the plug member is made of resin, and the fitting sealing surface is the lid. FIG. 18 shows the case of the container lid shown in FIG. 7 facing the center direction, and FIG. 8 shows the case of the container lid shown in FIG. 8 where the plug member is made of resin and the fitting sealing surface faces the outer peripheral edge of the lid. 19 and FIG. 20 shows the case of the container lid of FIG. 9 in which the plug member is made of metal and its fitting sealing surface faces the center of the lid, and the plug member is made of metal. FIG. 21 shows the case of the container lid in FIG. 10 in which the sealing surface faces the outer peripheral edge of the lid.

The perspective view which shows the main structural members of the container lid of this invention. The perspective view which shows the state by which the container lid of FIG. 1 was opened after completion. The perspective view which shows the main structural member of the container lid of the other aspect of this invention. The perspective view which shows the cross-section of the unopened state after completion of the container lid of FIG. The figure which expanded a part of container lid cross section of FIG. The schematic cross section which shows an example of the opening edge part process by resin coating of the cover member of this invention. The figure which shows an example of the container lid of this invention using the resin plug, (a) is a top view, (b) is sectional drawing, (c) is a partial enlarged view. The figure which shows another example of the container lid of this invention using the resin plug, (a) is a top view, (b) is sectional drawing, (c) is a partial enlarged view. The figure which shows an example of the container lid of this invention using a metal plug, (a) is a top view, (b) is sectional drawing, (c) is a partial enlarged view. The figure which shows another example of the container lid of this invention using a metal plug, (a) is a top view, (b) is sectional drawing, (c) is a partial enlarged view. Process drawing for demonstrating the manufacturing method of the container lid using the resin plug of this invention. Process drawing for demonstrating the other manufacturing method of the container lid using the resin plug of this invention. Process drawing for demonstrating another manufacturing method of the container lid using the resin plug of this invention. The process figure for demonstrating another manufacturing method of the container lid using the resin plug of this invention. Process drawing for demonstrating the manufacturing method of the container lid using the metal plug of this invention. Process drawing for demonstrating the other manufacturing method of the container lid using the metal plug of this invention. Process drawing for demonstrating the manufacturing method of the flexible tab member of this invention. Process drawing (resin plug) for demonstrating the processing method by the bending of the container lid opening edge part of this invention. Process drawing (resin plug) for demonstrating another processing method by the bending of the container lid opening edge part of this invention. Process drawing (metal plug) for demonstrating the processing method by bending of the container lid opening edge part of this invention. Process drawing (metal plug) for demonstrating the processing method by bending of the container lid opening edge part of this invention.

Explanation of symbols

1, 1 'lid member 1a, 1a' opening 1c, 1c 'curl portion (lid member)
1h, 1i, 1g 'opening edge 2, 2' opening tab 2a, 2a 'flexible tab member 2b, 2b' plug member 2c curled portion (flexible tab member)
2c 'Notch 2d, 2d' Plug adhesion surface 2e, 2e 'Knob 2f, 2f' Opening start edge 2i Flexible tab member edge A, B Adhesion C Cating seal

Claims (7)

An easily openable container lid comprising a lid member having an opening formed in advance and an opening tab provided on the outer surface side of the lid member so as to cover the opening and to be hermetically bonded at the periphery of the opening And
The opening tab is formed so that it can be fitted and integrated with a flexible tab member made of a laminate in which a resin film is formed on both surfaces of a metal foil and the tab member, and can be fitted into the opening of the lid member. It has a plug member and has a portion attached to the lid member that is difficult to detach and located on the opposite side across the opening from the opening start end, and the opening tab does not detach from the lid member even after opening And a shape immediately cut off from both sides in a direction substantially perpendicular to the peeling direction at a portion immediately before the portion that is difficult to remove from the lid member, and the tab width of the portion is reduced. In addition, the flexible tab member is tightly fixed so as to be peelable at the periphery of the lid member opening, and the edge of the opening is bent or curled to the outside of the lid, or edge-treated by resin coating. It is characterized by being Easy-open container lid with the resealing of that.   The container lid according to claim 1, wherein the lid member is a metal member having a winding processing portion at a peripheral edge portion.   The container according to claim 1 or 2, wherein the lid member has a thermal adhesiveness to at least the flexible tab member on the outer surface side, and is non-adhesive to the flexible tab member and the plug member on the inner surface side. lid.   The container lid according to any one of claims 1 to 3, wherein, in addition to the flexible tab member, a plug member is also bonded to the periphery of the opening of the lid member. The container lid according to any one of claims 1 to 4 , wherein the plug member is a resin plug member formed by injection molding or compression molding or a metal plug member formed by press molding. A step of processing the edge of the opening portion of the lid member having a pre-formed opening portion ; a flexible shape having a shape in which the tab width of the portion is reduced by cutting away from both sides in a direction substantially perpendicular to the peeling direction Forming the opening tab by integrating the flexible tab member and the plug member, applying the opening tab to the outer surface of the lid member, and arranging the flexible tab member and the outer surface of the lid member at the periphery of the opening. And a step of adhering the opening tab to a position on the opposite side across the opening from the opening start end so as to form a portion where it is difficult to remove from the lid member . Container lid manufacturing method. The manufacturing method according to claim 6 , wherein the opening tab is formed by integrally molding a plug member on a flexible tab member by injection molding or compression molding.

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