JPS6130983B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to an easy-to-open container lid with a liner, and more specifically, a peel-off portion is formed by shearing a tear-off score provided on a shell, and a container lid of a type in which opening is performed. The present invention relates to an improvement in container lids that facilitates the opening operation while preventing the score from running out during the sealing operation. (Prior Art) Conventionally, in the field of container lids such as bottle lids, a score (a line of weakness or Widely used are devices in which a tear-off section is defined by a score (cut line), and the score is sheared by pulling a grip provided at the opening start section with a finger to open the package. Naturally, in this type of easy-open container lid, it is necessary to provide a sealing liner made of resin for sealing with the bottle opening. As the container lid closest to the present invention,
Publication No. 144577 discloses a container lid shell body that includes a top plate portion and a skirt portion connected to the top plate portion, and is provided with an opening score that defines a peeling portion at a small distance from the periphery of the top plate portion, and a container lid shell body. a resin sealing liner applied to the inside of the score via an adhesive lacquer, and the sealing liner consists of a thick sealing ring and a film portion continuously located on both sides of the score. describes an easy-to-open container lid with a liner in which the film portion is torn off as the score is sheared when the bag is opened, and a portion of the film portion remains on the top plate portion. Furthermore, it is stated that the film portion has the effect of suppressing or preventing corrosion in the score of the lid shell body, and also has the effect of preventing the risk of cuts by covering the cut metal edges with the film. There is. (Problems to be solved by the invention) In order to prevent the score from breaking during the sealing operation, the film spanning the score part of the shell needs to have a certain thickness, and also to prevent corrosion of the score part. In order to achieve this, the film must be thick enough to prevent coating defects such as pinholes. However, as the thickness of the film increases, the required force to tear the film increases.
Moreover, since resin films generally have a large elongation, the amount of work required to tear the film becomes large, making it difficult to open the package. Therefore, an object of the present invention is to reduce the tear resistance of the liner film part and improve its ease of opening, while maintaining the reinforcing effect and corrosion prevention effect of the shell score part by the liner film part in the prior art. shall be. (Means for Solving the Problems) In order to solve the above problems, in the present invention, (1) the film portion extending over the shell score is thickened with sufficient thickness to provide corrosion resistance and reinforcing properties of the score portion; (2) a groove-like weakening line is placed on the inner surface of the film portion, and (3) the groove-like weakening line on the inner surface of the film portion is placed at a position slightly shifted from the opening score of the shell in the radial direction. do. (Operation) The above means operates as follows. Having the wall thickness as described in (1) above provides reinforcement to prevent the score from breaking when sealing the container, and also prevents coating defects such as pinholes from occurring and prevents corrosion of the shell score. acts to preserve the The groove-like weakening line (2) has the effect of reducing tear resistance or tearing work of the film portion and improving easy-opening performance. By providing the shell score and the film partial groove-like weakening line in the positional relationship described in (3) above, the thick film is positioned directly above the score, and the reinforcing effect and corrosion prevention effect on the score are maintained.
Since the weakened line on the groove is located near the score, it acts so as not to impair the ease of opening. As a result of the above-mentioned effects, in this type of easy-open container lid with a liner, the tear resistance of the liner film part is reduced while maintaining the reinforcing effect and corrosion prevention effect of the shell score part by the liner film part, It becomes possible to improve ease of opening. (Effects of the Invention) The container lid of the present invention has a sufficient reinforcing effect on the shell score portion even when the cap is plugged, and can be sealed with a large plugging pressure. Useful as a container lid for contents with autogenous pressure. Furthermore, according to the present invention, the tear resistance of the liner film portion can be reduced, making it possible for the first time to use strong polyethylene as the liner material for this type of container lid, thereby improving the hygienic properties of the container lid. It becomes possible to do so. Further, it becomes possible to manufacture the sealing ring, film portion, and groove-like weakening line of the resin liner all at once by embossing the resin within the shell. (Description of Preferred Embodiments) The present invention will be specifically described based on the accompanying drawings. In FIGS. 1 and 2 showing an easy-to-open container lid with a liner according to the present invention, this container lid includes a container lid shell 1 and a sealing liner 2 provided on the inside thereof.
It consists of. The shell 1 consists of a top plate part 3 and a skirt part 4 which is continuous with the top plate part 3 and hangs down from the periphery thereof. An opening tab 5 is provided integrally with this skirt portion 4 and protrudes outward,
A grip portion 6 is provided at the tip of the opening tab 5. Two scores (weakening lines) 8, 8 extend across the skirt portion 4 from the base 7 of the opening tab 5 on the skirt portion 4, and furthermore, these scores are connected to the outer periphery of the top plate portion 3 or the top plate portion 3. It extends along the boundary with the skirt portion 4. A protective coating 9 is applied to the inner surface of the shell 1,
The sealing liner 2 is in close contact with the shell 1 via this protective coating 9. According to the present invention, the sealing liner 2 is attached to at least one thick-walled sealing ring 10 that is to be engaged with the container mouth, and to the outer circumferential side of the sealing ring, the inner circumferential side of the sealing ring, or a plurality of sealing rings. Thin wall part 1 located between
1, most of the opening scores 8, 8 are provided in a positional relationship overlapping with the liner 2, and a groove is provided in the thin liner part 11 in a positional relationship close to the opening scores 8, 8 to the extent that they do not overlap. weakened line 1
Form 2. In order to engage and seal the container lid with the container mouth, the lower part of the container lid skirt 4 is bent inward along the bead of the container mouth and attached to the container mouth. Along with this bending process, a tensile force acts on the opening score 8 in the radially outward direction. In the present invention, most of the opening score 8 is provided in a positional relationship overlapping with the thin wall portion 11 of the liner 2, and the weakened line 1 provided on the liner thin wall portion 11 is provided.
2 is also provided in a positional relationship that does not overlap with the score 8, so the engraved portion of the opening score 8 is provided with a reinforcing effect and a corrosion prevention effect by the liner constituent resin. That is, when the score 8 and the weakened line 12 of the liner are in a positional relationship overlapping, this weakened line 12 cannot withstand the tensile force radially outward, and no reinforcing effect can be expected at all. However, in the present invention, by providing the weakening line or groove 12 of the liner slightly offset from the score 8, a structure reinforced against the radially outward tensile force applied to the score 8 can be achieved. Moreover, according to the present invention, the thin liner portion 11
Then, a groove-like weakened line 1 is placed along the score 8 in a positional relationship that does not overlap with the opening score 8 but is close to it.
2, the liner 2 is easily sheared along the groove-like weakened line 12 by the shearing force generated when the opening score 8 is sheared. In addition, the liner 2 is formed from a thick sealing ring 10 and a thin section 11, and the thin section 1
Providing the groove-shaped weakened line 12 on the liner 1 is important in that the attachment of the groove-shaped weakened line 12 to the liner does not adversely affect the sealing function and that the sealing effect is achieved most effectively. The sealing ring has the advantage of acting as a rib-like guide for precise shearing of the liner along the groove line of weakness 12. In the present invention, it is a remarkable feature that the liner is easily sheared even when the liner 2 is quite strongly adhered to the shell 1 around the score 8, and the liner 2 is strongly adhered around the score 8. Further advantages are achieved in terms of score reinforcement and corrosion prevention. In the present invention, it is particularly desirable for the opening score 8 to be located in such a positional relationship that most of the opening score 8 overlaps the liner thin wall portion 11 in terms of ease of opening. It should be understood that if the opening score 8 is provided at the connection portion of the liner thin wall portion 11 with the sealing ring 10, it may be provided so that most of the opening score 8 overlaps with the sealing ring 10. It is. In one embodiment of the invention, as shown in FIG.
A thin peripheral portion 11A is formed on the outer peripheral side of the sealing ring 10. The end of the thin peripheral portion 11A may extend up to the connection between the top plate and the skirt of the shell, or may extend beyond this connection to the skirt. In this embodiment, the tampering scores 8, 8 extend along the outer periphery of the sealing ring 10 without crossing the sealing ring 10, thereby strongly adhering the entire sealing ring 10 to the shell. This has a desirable effect in terms of sealing function. When opening, as shown in FIG. 4, by inserting a finger into the grip part 6 of the opening tab 5 and pulling it in the horizontal direction, the scores 8, 8 of the skirt part 4 are first sheared from the bases 7, 7. The peeling begins. Next, by lifting this tab 5 upward, the scores 8 provided on the periphery of the top plate portion 3 are sheared. As the shearing of scores 8 and 8 progresses, first, the substantially radial weakening lines 12A and 12A (shown in a broken state in FIG. 4) provided in the thin liner peripheral edge 11A are sheared, Next, shearing of the circumferential line of weakness 12 of the thin liner peripheral edge 11A occurs at a position close to this shearing position. In this way, peeling is performed with the thick liner sealing ring 10 adhered to the top plate portion 3 divided by scores 8 and 8, and the unsealing operation is completed. A part 11A-1 of the liner thin peripheral edge section divided by weakened lines 12A and 12A is adhered to the peel-off top plate part 3, while the other thin liner peripheral edge section 11A is engaged with the container opening 13. It remains on the side of the skirt part 4. In another aspect of the present invention, as shown in FIG. 5, a thin portion 11B is formed on the inner peripheral side of the sealing ring 10. As shown in FIG. 5, this thin portion 11B is
It is desirable to have a disc-like shape that covers the entire top plate part 3 from the viewpoint of corrosion resistance and hygienic characteristics.
It may have a ring shape if desired.
In this embodiment, as shown in the back view of FIG. 6, the opening scores 8, 8 extend approximately radially across the sealing ring 10 in the top plate portion 3, and then extend around the inner circumference of the sealing ring 10. It extends circumferentially along the The groove-like weakening line 12 of the liner is provided in a circumferential manner along the circumferential opening scores 8, 8. In the part 15 where the opening scores 8, 8 cross the sealing ring 10 of the liner and should therefore become a peel-off piece (the part surrounded by double-dot chain dots),
The sealing ring 10 and the top plate 3 of the shell are releasably bonded. Thus, when the opening tab 5 is pulled to shear the scores 8, 8 extending approximately in the radial direction, peeling occurs between the peeling portion of the top plate 3 and the sealing ring 10 of the liner, and then in the circumferential direction. An extended score 8,8 shear is performed. The liner 2 is strongly adhered to the shell top plate 3, except for the peelable adhesive part 15 mentioned above, and therefore has a circumferential score of 8,
When the shearing of step 8 begins, the peelable adhesive part 1 first
Shearing or breaking of the liner line of weakness 12B adjacent to line 5 occurs. Next, as the circumferential scores 8, 8 are sheared, the weakened lines 12, 12 are also sheared, and the top plate portion 3 is peeled off to open the package. in this case,
The disc-shaped thin wall portion 11B is adhered to the top plate portion 3 and is peeled off, while the sealing ring 10 remains on the side of the skirt portion 4 that engages with the container opening (not shown). In yet another aspect of the present invention, as shown in FIG. 7, between a plurality of sealing rings 10A and 10B,
A thin wall portion 11C serving as a valley is formed, and a groove-like weakened line 12 is formed around the thin wall portion 11C. In this embodiment, a circumferential opening score of 8,8
Except that it is formed along the thin wall portion 11C,
The manner in which the scores 8 and 8 are engraved and the position of the releasable adhesive on the sealing ring can be the same as those shown in FIGS. 5 and 6. In the present invention, relatively thick reinforcing ribs may be provided on the sides (one side or both sides) of the liner weakening line so that shearing or breaking at the liner weakening line is more reliably performed. In the present invention, any resin that is moldable and has cushioning properties as a liner is used as the resin for forming the liner. Thermoplastic resins which can be used particularly advantageously for the purposes of the present invention are:
Olefin resins, such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid ester copolymer, ionomer, etc., or a combination of two or more, and other soft Vinyl chloride resin can also be used. Particularly advantageous thermoplastic resins for the purposes of the present invention are:
Low density polyethylene, ethylene copolymer, etc., and in terms of liner properties, low density polyethylene, (a) ethylene-propylene copolymer, and (b) thermoplastic elastomer, especially styrene-diene (butadiene or isoprene) )-styrene block copolymer is preferably used, and these modifying components are preferably contained in an amount of 3 to 40% by weight per low density polyethylene. The liner is formed, for example, by supplying the above-mentioned resin to the inside of a painted metal plate or a pre-molded container lid shell, and then stamping the resin in a molten state. This method is advantageous because the thick sealing ring, the thin-walled portion, and the groove-like line of weakening are formed all at once. The shape of the groove is
It can be of any shape such as an inverted triangle, an inverted trapezoid, or a U-shape, and the thickness of the groove liner is 0.01~
It is preferably 0.2 mm, particularly in the range of 0.05 to 0.15 mm. The distance between the groove-like weakened line 12 of the liner thin section and the score 8 is determined by the following criteria: if they are too close together, the reinforcing effect of the score will be lost, and if they are too far apart, the ease of opening will be impaired. decided to avoid. Generally, this spacing should be in the range of 0.1 to 1 mm. The container lid shell can be easily manufactured by subjecting the coated metal material to per se known means, such as stamping press molding and processing. As the metal material forming the container lid shell, light metals such as sheet-like or foil-like surface-untreated steel (black plate), surface-treated steel, aluminum, etc. are used. Surface-treated steel includes chemical treatments such as phosphoric acid treatment and chromic acid treatment; chemical conversion treatments such as electrolytic chromic acid treatment; electrolytic plating treatments such as electrolytic tin plating, electrolytic zinc plating, and electrolytic chrome plating; molten aluminum plating. Examples include those that have been subjected to a hot-melt plating process such as a hot-dip tin plating process. At least the surface of these metal materials that will become the inner surface of the lid is painted with a protective paint. Suitable examples of paints include thermosetting resin paints, such as phenol-formaldehyde resins, furan-formaldehyde resins, xylene-formaldehyde resins, ketone-formaldehyde resins, urea-formaldehyde resins, melamine-formaldehyde resins, alkyd resins,
Unsaturated polyester resin, epoxy resin, bismaleimide resin, triallyl cyanurate resin, thermosetting acrylic resin, silicone resin, oil-based resin, or thermoplastic resin coating, such as vinyl chloride-vinyl acetate copolymer, vinyl chloride-acetic acid These include partially saponified vinyl copolymers, vinyl chloride-maleic acid copolymers, vinyl chloride-maleic acid-vinyl acetate copolymers, acrylic polymers, saturated polyester resins, and the like. These resin coatings may be used alone or in combination of two or more. These paints preferably have thermal adhesion to the soft resin that makes up the liner, and if the liner-constituting resin is an ethylene resin, a paint containing oxidized polyethylene or acid-modified olefin resin is used. The strength of adhesion can be adjusted by changing the amounts of these ingredients. Further, when the liner constituent resin is made of a vinyl chloride resin, a paint containing a vinyl chloride resin component or an acrylic resin component is particularly suitable. The easy-open container lid with liner of the present invention can be modified in many ways other than those shown. For example, instead of arranging the scores on the top plate of the container lid shell body in a circumferential manner, the scores may be provided so as to cross the top plate in a straight line or a curved line. Furthermore, the present invention is applicable not only to container lids with two scores extending from the base of the opening tab, but also to container lids with one score extending from the base of the opening tab. For example, in FIG. 8 showing still another example of the easy-to-open container lid of the present invention, the skirt portion 4 of the container lid shell 1 has an opening tab 5 integrally therewith and protruding obliquely in the circumferential direction. will be provided. A score 8 extends from the upper base 7 of the unsealing tab 5 in a diagonal direction along the skirt portion 4, and is further carved so as to span more than about half a circumference of the boundary between the top plate portion 3 and the skirt portion 4. At the bottom of this score 8 engraved part,
The liner layers 2 (see the partial cross section) are provided so as to overlap. (Example) The present invention will be further explained in the following example. Example 1 One side of a 0.25 mm thick aluminum plate was coated with a 5μ thick epoxy urea paint, and the other side was coated with a 5μ thick epoxy-phenol paint containing polyethylene oxide in an amount of 10% by weight based on the solid content of the paint. Each coat was painted to a thickness of , and baked at 200℃ for 10 minutes. This coated aluminum plate was formed by multi-step pressing so that the polyethylene oxide-containing paint surface was the inner surface, and was formed into a container lid shell having the shape shown in FIGS. 1 and 2. In this case, the outer diameter of the container lid shell is 42
mm, and the circumferential score portion of the top plate was 2 mm inside from the outer periphery of the top. A molten low-density polyethylene is supplied from an extruder to the inside of the shell, and is pressed with a cold mold to form a ring-shaped liner in the shape shown in Figures 2 and 3. It was glued to the body. The thin wall portion of the liner was 0.3 mm thick and was provided circumferentially with a width ranging from 1.5 mm on the outside to 0.5 mm on the inside of the circumferential score. A sealing ring (V-shaped, height 2 mm, radial width 3 mm) was provided on the radially inner side of this thin portion, and a weakened line with a thickness of 0.1 mm was provided on the sealing ring side of the thin portion. A gap of 0.3 mm was provided between the score part and the weakened line. In addition, a weakened line was provided along the score at the intersection of the thin part and the opening start part of the score. Comparative Examples 1 to 2 A container lid (Comparative Example 1) that is the same as Example 1 except that a line of weakening is not provided in the thin liner part by the same operation as in Example 1, and the liner does not have a thin part. A container lid (Comparative Example 2) which was the same as Example 1 except for this was created. The outer diameter of the opening of the container lids of Example 1 and Comparative Examples 1 and 2
Plugability (scored or not) using a 41mm 350ml glass bottle and a crimper for 42mm container lids.
Decompression resistance sealability (by 95°C hot water filling sealing) and unsealability were evaluated. As a result, as shown in Table 1,
While the comparative example had high sealability and unsealability, the present example had good sealability and unsealability.

[Table] Judgment: ○Good ×Bad Example 2 A container lid shell having the shape shown in FIGS. 1 and 2 was molded by the same operation as in Example 1. In this case, the outer diameter of the container lid shell was 42 mm, and the circumferential score portion of the top plate was 4 mm inside from the outer periphery of the top plate.
Among the inner parts of the inner top surface (the surface coated with polyethylene oxide-containing paint) of this container lid shell body, which are sandwiched between two scores, there is a circle with a diameter 2 mm smaller than the diameter of the circumferential score part and a straight line on the opening start side. An altkyd resin paint was applied to a thickness of 2 μm to the area formed by the intersection of the extended line of the shaped score and dried. A container lid with a liner having the shape shown in FIG. 5 was prepared by supplying molten low-density polyethylene to the inside of this shell (using an extruder) and stamping it with a cold mold. The liner has a sealing ring (V-shaped, height 2 mm, radial width 3 mm) on the outside of the circumferential score.
A thin part with a thickness of 0.3 mm was provided on the inside. Also,
A weakened line with a thickness of 0.05 mm was provided around the entire circumference at a portion located 1 mm inside from the circumferential score of the thin wall portion. Comparative Example 3 A container lid that was the same as Example 2 except that the liner was not provided with a thin wall portion was produced by the same operation as in Example 2. The container lids of Example 2 and Comparative Example 3 were prepared in the same manner as in Example 1 to improve openability and pressure resistance (by injecting 9 Kg/cm ² N ₂ gas into the container with the container lid closed underwater to remove air bubbles). As a result of a comparative evaluation of the sealability and unsealability (to see if there was any leakage), both the sealability and pressure resistance were good, but there was a difference in the unsealability, and in the case of Example 2, it was good. However, in the case of Comparative Example 3, the package could not be opened.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the outline of the container lid of the present invention, and FIG. 2 is a sectional view of the container lid of the present invention.
FIG. 3 is a partially enlarged view showing one embodiment of the present invention, FIG. 4 is a perspective view showing the procedure for opening the container after the specific example shown in FIG. 3 is attached to the container, and FIG. The figure is a partially enlarged view showing another embodiment according to the present invention, FIG. 6 is a partial bottom view of the specific example shown in FIG. FIG. 8 is a partially enlarged view showing an embodiment of the present invention, and FIG. 8 is a perspective view showing another embodiment of the present invention. 1... Container lid, 2... Liner, 3... Top plate, 4... Skirt, 5... Opening tab, 8...
Score, 9... Paint layer, 10, 10A, 10B...
...Sealing ring, 11, 11A, 11A-1, 1
1B, 11C...Thin wall portion, 12, 12A...Groove weakened line, 13...Container mouth.

Claims (1)

[Scope of Claims] 1. A container lid shell body comprising a top plate portion and a skirt portion connected thereto, and in which an opening score defining a peeling portion is provided on the top plate portion or the skirt portion; a resin sealing liner applied to the inside via an adhesive lacquer, the sealing liner consisting of a thick sealing ring and a film portion continuously located on both sides of the score; When opening, the film part of the sealing liner is torn off as the score is sheared, and a part of it is left on the top plate part of the lid of an easy-to-open container with a liner. The thickness of the film is sufficient to provide corrosion resistance and reinforcement, and groove-shaped weakening lines are placed on the inner surface of the film.
An easy-to-open container lid with a liner, characterized in that the groove-like weakening line on the inner surface of the film portion is arranged at a position slightly shifted in the radial direction from the opening score position of the shell.