JPH0547465B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an easy-to-open container lid for a container having a crown opening. The term "crown mouth" used in this specification is
JIS standard S9017, GPI (Glass Packaging Institute) standard No. commonly used in the United States.
600 or the container neck specified or described in the West German standard DIN 6094 commonly used in European countries. [Prior Art] As an easy-to-open container lid for a container having a crown opening, a container lid comprising a metal body and a synthetic resin liner is disclosed in Japanese Patent Publication No. 13389/1989. It is used. The metal main body has a circular top wall, a cylindrical skirt wall depending from the periphery of the top wall, and a projecting piece projecting from a portion of the lower end of the skirt wall. A pair of weakened lines are formed in the skirt wall and the top wall on both sides of the projecting piece, extending upward from the lower end of the skirt wall and then extending to the top wall. A separately formed tension ring is usually connected to or integrally formed on the protruding piece. The synthetic resin liner disposed on the inner surface of the top wall has an annular sealing protrusion, and when the container lid is attached to the crown opening of the container as required, the inner circumferential surface of the annular sealing protrusion will close to the crown opening. It is brought into close contact with the outer peripheral surface. [Problem to be Solved by the Invention] As is well known, containers with caps are used as containers for beverages such as soft drinks, and are often sold to consumers by vending machines. However, according to the experience of the present inventors, when a container containing a beverage is processed by a vending machine, when the container is transported from the storage position to the outlet in the vending machine, the container lid, especially the It has been found that a considerable impact is applied to the upper half of the skirt wall of the metal body, and in conventional container lids, there is a considerable risk that the sealing of the crown opening may be damaged due to such impact. The present invention has been made in view of the above facts, and its technical problem is to improve the impact resistance of the container lid of the above form so that the cap opening can be sealed even when disposed of by a vending machine. The objective is to ensure that it is maintained sufficiently without damage. [Means for Solving the Problems] As a result of intensive research and experiments, the present inventors have determined that the height of the annular sealing ridge of the synthetic resin liner is higher than that of the conventional one.
Significantly increased from about 1.45mm to 1.95 to 2.65
mm, and the annular sealing protrusion of the synthetic resin liner has an outer circumferential surface extending substantially vertically and an inner circumferential surface having a relatively large inclination angle α of 45 to 55 degrees.
The above-mentioned technical problem is achieved by forming a base having a base portion extending downwardly and radially outwardly, and a free end portion extending at a relatively small inclination angle β of 5 to 15 degrees. I found out that it is possible. That is, according to the present invention, as a container lid that achieves the above-mentioned technical problem, there is provided a container lid for a container having a crown opening, which comprises a metal main body and a synthetic resin liner, the metal main body is a circular top wall,
It has a cylindrical skirt wall that hangs down from the periphery of the top wall, and a protruding piece that protrudes from a part of the lower end of the skirt wall, and the skirt wall extends upward from the lower end of the skirt wall on both sides of the protruding piece. A pair of weakened lines are formed that extend and then extend through the top wall. In a container lid having an annular sealing ridge that is brought into close contact with a surface, the height of the annular sealing ridge of the synthetic resin liner based on the inner surface of the top wall of the metal body.
h ₁ is 1.95 to 2.65 mm, and the outer peripheral surface of the annular sealing ridge of the synthetic resin liner extends substantially vertically, and the inner peripheral surface extends downward and radially outward at an inclination angle α. a base portion extending at an angle and a free end extending downwardly and radially outwardly at an angle of inclination β, wherein the angle of inclination α is between 45 and 55 degrees, and the angle of inclination β is between 5 and 15 degrees. There is provided a container characterized in that the container is [Function] As will be clearly understood from the experimental examples and comparative experimental examples mentioned later, the container lid of the present invention in which the annular sealing ridge of the synthetic resin liner has been improved can be processed by a vending machine. Therefore, even if an impact is applied to the upper half of the skirt wall of the metal body, the sealing of the crown opening is sufficiently maintained without being damaged. [Embodiments] Hereinafter, preferred embodiments of a container lid constructed in accordance with the present invention will be described in more detail with reference to the accompanying drawings. Referring to FIG. 1, the container lid, generally designated by the numeral 2, includes a metal body 4 and a tension ring 6 connected to the body 4. The main body 4 can be formed from a suitable metal plate such as an aluminum-based alloy plate, a chromic acid-treated steel plate, or a tin plate.
includes a circular top wall 8, a cylindrical skirt wall 10 hanging down from the periphery of the top wall 8, and a projecting piece 12 extending downward from a part of the lower end of the skirt wall 10. The tension ring 6 is formed separately from the main body 4 and is integrally connected to the free end of the protruding piece 12 of the main body 4 by an appropriate method such as mechanical seaming connection, welding, or gluing. . Reinforcing ribs 14 are formed on the protruding piece 12 of the main body 4 and at the connecting portion between the protruding piece 12 and the tension ring 6. The tension ring 6 can be formed from a suitable metal plate such as an aluminum base alloy plate, a chromic acid treated steel plate or a tin plate, or from a suitable synthetic resin such as polyethylene or polypropylene. If desired, a separately formed tension ring 6 can be attached to the body 4.
Instead of connecting to the protruding piece 12 of the protruding piece 1
2 itself can be enlarged to a size suitable for grasping with fingers, and if necessary, the free end of the enlarged protruding piece 12 itself can be shaped into a ring suitable for grasping with fingers. In the main body 4 of the illustrated container lid 2, relatively small notches 16 are formed at the intersections of the lower end of the skirt wall 10 and each of both side edges of the protruding piece 12. A pair of weakened lines 18 and 20 are formed from each of the notches 16, extending upward through the skirt wall 10 and then extending through the top wall 8. The pair of weakened lines 18 and 20 are formed by slits (kerfs) in the metal plate at intervals in the extending direction.
Although it may be a so-called perforation formed by forming a metal plate, it is convenient to use a so-called score formed by reducing the thickness of the metal plate. Referring to FIG. 2, a synthetic resin liner 22 is provided on the inner surface of the top wall 8 of the main body 4. The liner 22 is made of a polyolefin resin such as polyethylene or a suitable synthetic resin material such as polyvinyl chloride by a method known per se (for example, the method disclosed in Japanese Patent Publication No. 19886-1986). It is conveniently formed by stamping directly onto the inner surface. The illustrated liner 22 has a relatively thin center portion 24 and a relatively thick peripheral portion 26. Two annular protrusions are formed on this peripheral portion 26, that is, an annular sealing protrusion 28 located on the outside and an annular auxiliary protrusion 30 located on the inside. In the container lid 2 constructed according to the present invention, the amount of protrusion, that is, the height, of the annular sealing protrusion 28 is increased compared to the conventional one, and the main body 4
It is important that the height h ₁ of the annular sealing protrusion 28 with respect to the inner surface of the top wall 8 is 1.95 mm≦h ₁ ≦2.65 mm. If the height h ₁ is smaller than 1.95 mm, as will become clear from the description below, the impact resistance is insufficient and the seal tends to be damaged when processed in a vending machine. On the other hand, increasing the height _h1 excessively does not particularly contribute to improving impact resistance;
A problem arises in that the amount of materials used increases and the cost increases. The amount of protrusion, that is, the height of the annular auxiliary protrusion 30 may be the same as the conventional one, and the height h ₂ of the annular auxiliary protrusion 30 with respect to the inner surface of the top wall 8 of the main body 4 is
Approximately 1.45mm is sufficient. The thickness t ₁ of the peripheral edge 26 itself of the liner 22 is 0.35 mm≦t ₁ ≦0.55, as in the conventional case.
mm is fine. The outer peripheral surface of the annular sealing ridge 28 extends substantially perpendicularly to the inner surface of the skirt wall 10 of the main body 4 at a distance. On the other hand, the inner circumferential surface of the annular sealing protrusion 28 extends downwardly and radially outwardly. More specifically, the base of the inner peripheral surface of the annular sealing ridge 28 extends at a relatively large angle of inclination α, and the free end extends at a relatively small angle of inclination β.
The inclination angle α is 45 degrees≦α≦55 degrees, and the inclination angle β is 5 degrees≦β≦15 degrees. Annular sealing protrusion 28
Height h ₃ and thickness t ₂ of the boundary between the base and free end of
are 0.95mm≦h ₃ ≦1.15mm and 0.50mm≦t ₂ ≦0.65, respectively.
mm is fine. The outer circumferential surface of the annular auxiliary protrusion 30 extends downward and radially inward at an inclination angle γ. The above-mentioned inclination angle γ may be 45 degrees≦γ≦55 degrees. On the other hand, the inner circumferential surface of the annular auxiliary protrusion 30 is
It extends virtually vertically. The container lid 2 as described above is applied to a container which may be made of glass or synthetic resin and has a cap 32 which is known per se as shown in FIG. An annular locking jaw portion 34 is formed on the outer peripheral surface of the crown opening 32. Continuing the explanation with reference to FIG. 3, the crown opening 32
When attaching the container lid 2 to the crown opening 32 and sealing the crown opening 32, the container lid 2 is fitted onto the crown opening 32 and pressed downward with a required pressure, thus sealing the peripheral edge 2 of the liner 22.
6 is brought into close contact with the top of the crown opening 32. In this way, the annular sealing protrusion 2 formed on the peripheral edge 26
8 and the annular auxiliary protrusion 30 are deformed into the shape shown in FIG.
It is brought into close contact with the outer peripheral surface of the top. While maintaining the above state, the lower end of the skirt wall 10 is bent inward and engaged with the locking jaws 34 of the crown opening 32, as shown in FIG. As will be understood from the experimental examples and comparative experimental examples described below, according to the container lid 2 according to the present invention in which the height h ₁ of the annular sealing ridge 28 is increased, the impact resistance is greatly improved. The inventors of the present invention speculate as to the reason for this as follows. That is, according to the container lid 2 according to the present invention in which the height h ₁ of the annular sealing ridge 28 is increased, as shown in FIG. The space between the outer circumferential surface of the crown opening 32 and the inner circumferential surface of the skirt wall 10 of the main body 4 of the container lid 2 is almost completely filled by the annular sealing ridge 28, and the remaining void 36 is significantly small. Therefore, the top wall 8 and the skirt wall 1 of the main body 4 of the container lid 2
0 or the upper half of the skirt wall 10, the deformation of the main body 4 is sufficiently suppressed by the presence of the annular sealing ridge 28, thereby improving the impact resistance. It is inferred that this will improve the When opening the crown opening 32, first put your finger on the tension ring 6 and move it until it extends approximately horizontally, and then pull the tension ring 6 approximately horizontally outward, thus creating a pair of weakened lines. The lower ends of 18 and 20 are broken off. Next, the tension ring 6
upwards or backwards, and a pair of weakened lines 18
and 20 fractures are allowed to proceed. After the pair of weakened lines 18 and 20 are almost completely ruptured, when the tension ring 6 is further pulled upwards or backwards, the arc-shaped skirt wall 10 is displaced upwardly and outwardly, and the crown The annular locking jaw 34 of the spout 32 is disengaged, and the entire container lid 2 is thus disengaged from the crown spout 32. <Experimental Examples and Comparative Experimental Examples> Experimental Example 1 The main body was molded from a 0.17 mm thick tin plate, then a polyethylene liner was embossed on the inner surface of the top wall of the main body, and then the main body was molded from a 0.17 mm thick tin plate. A separately formed tension ring was secured to the free end of the projecting piece of the body, thus producing a container lid in the form shown in FIGS. 1 and 2. The various dimensions and angles of such container lids were as follows (see also Figure 2). Outer diameter of main body D ₁ ...27mm Height of main body H ...6.8mm Thickness of peripheral edge of liner t ₁ ...0.45mm Height of annular sealing protrusion h ₁ ...2.35mm Height of annular auxiliary protrusion h ₂ ……1.45mm Outer diameter of the annular sealing ridge d ₁ ……27.45mm Inner diameter of the annular auxiliary ridge d ₂ ……19.06mm Inclination angle α of the annular sealing ridge ……50 degrees Inclination of the annular sealing ridge Angle β ……10 degrees Height of the boundary between the base of the annular sealing ridge and the free end h ₃ ……1.05mm Thickness of the boundary between the base of the annular sealing ridge and the free end t ₂ ……0.57mm Inclination angle γ of the annular auxiliary protrusion...50 degrees The following impact resistance test was performed on 100 such container lids. Use a 120ml glass bottle with a crown opening with a nominal diameter D ₂ (see Figure 3) of 26.3mm as explained in JIS standard S9017.
A glass bottle was filled with 120 ml of sulfuric acid and sodium carbonate so that the internal pressure after sealing was 4 Vol., and a container lid was attached to the crown opening. Next, using a vending machine sold by Matsushita Reiki Co., Ltd. under the product number "NS-N1:M", each glass bottle was repeatedly conveyed seven times from the storage position to the outlet. Afterwards, the number of leaks was determined. The results were as shown in Table 1 below. Experimental Example 2 A container lid identical to Experimental Example 1 was manufactured except that the height _h1 of the annular sealing protrusion was 1.95 mm.
The same impact test as in Experimental Example 1 was performed on 100 pieces. The results were as shown in Table 1 below. Experimental Example 3 A container lid identical to that of Experimental Example 1 was manufactured except that the height h ₁ of the annular sealing protrusion was 2.10 mm.
The same impact test as in Experimental Example 1 was performed on 100 pieces. The results were as shown in Table 1 below. Experimental Example 4 A container lid identical to Experimental Example 1 was manufactured except that the height _h1 of the annular sealing protrusion was 2.50 mm.
The same impact test as in Experimental Example 1 was performed on 100 pieces. The results were as shown in Table 1 below. Comparative Experimental Example 1 A container lid identical to Experimental Example 1 except that the height h ₁ of the annular sealing protrusion was 1.80 mm was manufactured.
The same impact test as in Experimental Example 1 was performed on 100 pieces. The results were as shown in Table 1 below. Comparative Experimental Example 2 A container lid identical to Experimental Example 1 was manufactured except that the height _h1 of the annular sealing protrusion was 1.45 mm.
The same impact test as in Experimental Example 1 was performed on 100 pieces. The results were as shown in Table 1 below.

〔Effect of the invention〕

According to the container lid of the present invention, the impact resistance is greatly improved, and the sealing of the crown opening is maintained sufficiently reliably without being damaged even when processed by a vending machine.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a preferred embodiment of a container lid constructed in accordance with the present invention. FIG. 2 is a sectional view of the container lid of FIG. 1. FIG. 3 is a partial cross-sectional view showing the container lid of FIG. 1 attached to the crown opening. 2...Container lid, 4...Metal body, 6...Tension ring, 8...Top wall, 10...Skirt wall, 1
2...Protruding piece, 18...Weakening line, 20...Weakening line, 22...Synthetic resin liner, 28...
...Annular sealing protrusion, 30...Annular auxiliary protrusion, 32...
...crown mouth.

Claims (1)

[Scope of Claims] 1. A container lid for a container having a crown spout, comprising a metal body and a synthetic resin liner, the metal body having a circular top wall and hanging from the periphery of the top wall. a cylindrical skirt wall and a protruding piece protruding from a part of the lower end of the skirt wall, extending upward from the lower end of the skirt wall on both sides of the protruding piece, and then extending the top wall from the lower end of the skirt wall; A pair of extending weakened lines are formed, the synthetic resin liner is disposed on the inner surface of the top wall of the metal body, and the inner circumference is brought into close contact with the outer circumference of the top of the crown opening. In a container lid having a ridge, the height of the annular sealing ridge of the synthetic resin liner based on the inner surface of the top wall of the metal body.
h ₁ is 1.95 to 2.65 mm, and the outer peripheral surface of the annular sealing ridge of the synthetic resin liner extends substantially vertically, and the inner peripheral surface extends downward and radially outward at an inclination angle α. a base portion extending at an angle and a free end extending downwardly and radially outwardly at an angle of inclination β, wherein the angle of inclination α is between 45 and 55 degrees, and the angle of inclination β is between 5 and 15 degrees. A container characterized by being: