JPH0454114Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a crown, and more particularly to a crown comprising a metal crown shell and a synthetic resin liner. [Prior Art] As is well known, for soft drinks, beer, etc.
As lids for glass bottles that are collected and reused.
Crowns in which a synthetic resin liner is provided on the inner surface of the top wall of a crown shell called an intermediate crown or a crown shell called a standard crown are widely in use. It is desirable that such a crown has adequate sealing properties for normal bottles, and also sufficient sealing properties for so-called damaged bottles whose mouth and neck are somewhat damaged during collection. It can be done. The sealing properties of the crown greatly depend on the form of the liner, and the form of the liner that was proposed to meet the above requirements was a form with two annular protrusions that also took formability into consideration (Utility Model Publication No. 54-30123). In order to improve impact resistance in a form with two annular protrusions, the thickness of the outer annular protrusion is greatly increased (Tokuko Sho
55-51793), a form with three annular protrusions (Japanese Utility Model Publication No. 55-32860), and a form with three annular protrusions, an inner annular protrusion is used to improve impact resistance. A form in which the thickness of the so-called valley between the outer annular protrusion and the outer annular protrusion is greatly increased (Utility Model Act 1983-
37482). [Problem to be solved by the invention] The above-mentioned damaged bottles include so-called externally chipped bottles in which a chip is generated in the outer peripheral area of the top surface of the mouth and neck, and so-called internal chipped bottles in which a chip is generated in the internal peripheral area of the top surface of the mouth and neck. There are chipped bottles and so-called top-chipped bottles in which a chip is formed in the center of the top surface of the mouth and neck. Conventional crowns have sufficient sealing properties for certain damaged bottles, but they do not protect against other scratches. Does not have sufficient sealing properties for bottles. The present inventors estimate that one of the reasons for this is that the sealing pressure of the inner annular protrusion is relatively small (in fact, in conventional crowns, when observing the liner after opening the crown, the outer (While the annular protrusion has been significantly deformed, the inner annular protrusion has a shape close to its original shape.) The present invention was made in view of the above facts, and the technical problem to be solved is to To improve a conventional crown so that it has sufficient sealing properties for both bottles, bottles with a chipped interior, and bottles with a chipped top. [Means for Solving the Problems] As a result of intensive research, the inventors of the present invention have developed a liner having two annular protrusions, that is, concentric inner and outer annular protrusions, from the inner periphery to the center of the top surface of the mouth and neck. More specifically, by relatively increasing the pressure contact force of the inner annular protrusion with respect to the area and relatively reducing the pressure contact force of the outer annular protrusion with respect to the outer peripheral area or outer peripheral surface of the top surface of the mouth and neck. Compared to the conventional liner form having two annular protrusions, the inner diameter _d1 of the inner annular protrusion is made relatively large, and the inner diameter D of the crown shell is 0.720D to 0.7250D.
(If the inner diameter d ₁ of the inner annular protrusion is excessively large, the pressure contact force of the outer annular protrusion against the outer circumferential area or outer circumferential surface of the top surface of the mouth and neck will be excessively reduced.
In addition, if the inner diameter d ₁ of the inner annular ridge is excessively small, the pressure force of the inner annular ridge against the inner periphery or central region of the top surface of the mouth and neck will become excessively small), and the outer diameter d ₂ of the outer annular ridge Relatively large, 0.952D to 0.972D relative to the inner diameter D of the crown shell
and set the average radial thickness t ₁ of the outer annular ridge within a predetermined range (the outer diameter d ₂ and the average radial thickness t ₁ of the outer annular ridge are strongly related to each other, but If the outer diameter d ₂ of the annular protrusion is excessively large or the radial average thickness t ₁ is excessively thin, the pressing force of the outer annular protrusion against the outer circumferential area or the outer peripheral surface of the top surface of the mouth and neck becomes excessively small, If the outer diameter _d2 of the outer annular protrusion is too small or the radial average thickness _t1 is too thick, the pressure force of the inner annular protrusion against the inner circumference or central region of the top surface of the mouth and neck will become excessively small. ,
And also the average radial thickness of the outer annular ridge t ₁
It has been found that the above-mentioned problem can be achieved by reducing the impact resistance (that is, the sealing maintenance property when subjected to impact) excessively deteriorating if the material is too thin. That is, according to the present invention, a metal crown shell has a top wall and a skirt wall hanging from the periphery thereof;
a synthetic resin sealing liner disposed on the inner surface of the top wall of the crown shell, the liner having concentric inner and outer annular ridges, the inner annular ridge being substantially parallel to the crown axis; It has an inner circumferential surface that extends and an outer circumferential surface that extends upwardly and radially outwardly at an angle α of 40 to 50 degrees, and has a downward protruding height _h1 . The overall height H of the crown shell is set to 0.205H to 0.235H, and the lower half of the outer annular protrusion is defined by an arc having its center within the outer annular protrusion, and the upper half is defined by an arc having its center within the outer annular protrusion. It has an inner circumferential surface defined by an arc having a center inside the annular protrusion, an outer circumferential surface extending substantially parallel to the crown axis, and a flat lower surface extending substantially perpendicular to the crown axis. In the crown, the downward protrusion height h ₂ is set to 0.218 to 0.251H with respect to the total height H of the crown shell, and the radial thickness t ₂ of the flat lower surface is set to 0.60 to 0.80 mm. The inner diameter d ₁ of the inner annular ridge is set to 0.720D to 0.750D with respect to the inner diameter D of the crown shell, and the outer diameter d ₂ of the outer annular ridge is set with respect to the inner diameter D of the crown shell.
There is provided a crown characterized in that the outer annular protrusion has a radial average thickness t ₁ of 0.80 to 1.20 mm. Regarding the inner diameter D and overall height H of the crown shell, as is well known, the inner diameter D of the standard crown bottle applied to GPI regulation bottles is 26.75 ± 0.1 mm, and the overall height H
is 6.65±0.2mm, the inner diameter D of the intermediate crown is 26.75±0.1mm, and the total height H is 5.97±0.2
mm, the inner diameter D of the standard crown shell applied to JIS standards is 26.5 ± 0.1 mm, and the total height H is 6.5 ± 0.2
mm, and the inner diameter D of the intermediate crown shell
is 26.5±0.1mm, and the total height H is 5.97±0.2mm. [Function] In the crown of the present invention, the pressure contact force of the inner annular protrusion (therefore, the sealing function) against the inner periphery or central region of the top surface of the mouth and neck is relatively increased, and the By relatively reducing the pressure contact force (and thus the sealing function) of the outer annular protrusion against the outer circumferential surface, as will be clearly understood from the experimental examples and comparative experimental examples described below, the outer-chip bottle, the inner-chip bottle, and Sufficient sealing properties are achieved for both top-bottomed bottles. [Embodiment] Hereinafter, an embodiment of the crown constructed according to the present invention will be described in more detail with reference to the accompanying drawings. Referring to FIG. 1, the illustrated crown, generally designated by the numeral 2, is comprised of a metal crown shell 4 and a synthetic resin liner 6. The crown shell 4, which may take the form known as an intermediate or standard crown shell, has a circular top wall 8 and a skirt wall 10 depending from the periphery of the top wall 8;
A so-called corrugation is formed in the lower half of the skirt wall 10. The crown shell 4 is made of a suitable metal thin plate such as a chromic acid-treated thin steel plate or a thin tin plate coated with a suitable varnish, lacquer, etc. as necessary from the viewpoint of rust prevention and improvement of adhesion to the liner 6. It can be formed by press working. On the other hand, the liner 6 disposed on the inner surface of the top wall 8 of the crown shell 4 is formed by molding an appropriate synthetic resin such as polyolefin resin such as polyethylene onto the inner surface of the top wall 8 using a well-known method. It can be conveniently formed by: Next, referring to FIG. 1 and FIG. 2, the form of the liner 6 improved according to the present invention will be described. The liner 6, which is generally disk-shaped, has two concentric annular ridges, namely an inner annular ridge 12 and an outer annular ridge 14. The inner circumferential surface 16 of the inner annular protrusion 12 is aligned with the crown axis 18 as in the conventional case.
(Fig. 1). The term "substantially parallel" is not limited to substantially parallel, but upwardly, radially inwardly or radially outwardly at a slight angle of 10 degrees or less with respect to the crown axis 18. It also includes tilting.
In the present invention, the inner diameter d ₁ of the inner annular protrusion 12
is relatively large compared to the conventional case, and the crown shell 4
0.720D to 0.750D for the inner diameter D (Fig. 1) of
Therefore, for the crown shell where D=26.5mm, 19.116
It is important that the diameter is between 19.913mm and 19.913mm. The outer circumferential surface 20 of the inner annular protrusion 12 is formed at an angle α of 40 to 50 degrees with respect to the crown axis 18, as in the conventional case.
and extends upwardly and radially outwardly. The downward protrusion height h ₁ of the inner annular protrusion 12 based on the center of the inner surface of the top wall 8 of the crown shell 4
is 0.205H for the total height H of crown shell 4 (Fig. 1)
1.200 to 1.400 mm for a crown shell with H=5.97 mm. In the illustrated embodiment, the lower end (i.e., the protruding end) of the inner annular ridge 12 forms a sharp corner, but if desired, the lower end of the inner annular ridge 12 may be rounded or relative to the crown axis 18. It is also possible to form a flat surface extending substantially vertically. On the other hand, the outer annular protrusion 14 has an outer circumferential surface 22 extending substantially parallel to the crown axis 18 as in the conventional case. The phrase used here is “substantially parallel”
However, it is not limited to being substantially parallel, but may be inclined upwardly, radially outwardly, or radially inwardly at an angle of 10 degrees or less with respect to the crown axis 18. contains. In the present invention, the outer diameter d ₂ of the outer annular protrusion 14 is larger than that of the conventional case, and is 26.5 mm to 26.8 mm of the crown shell 4.
0.952D to
0.972D, so 25.276 to 25.807mm for a crown shell with D=26.5mm is important. In addition, in the present invention, the outer annular protrusion 1
The radial thickness t ₁ of 4, i.e. the line −
It is important that the average value t ₁ of the radial thickness in the region below is 0.80 to 1.20 mm.
In order to satisfy such requirements, the inner circumferential surface 24 of the outer annular protrusion 14 is inclined upwardly and radially inward at a relatively large angle of, for example, about 40 to 60 degrees with respect to the crown axis 18. Thus, rather than having the radial thickness of the outer annular ridge 14 vary relatively significantly when viewed in the direction of the crown axis 18, the outer annular ridge 1 is
4 is defined by a flat lower surface 26 having a radial thickness t ₂ in a predetermined range, and the outer annular protrusion 14
It is desirable to make the change in the radial thickness relatively small, for example, 0.40 mm or less, at least in the lower half of the outer annular protrusion 14. Annular protrusion 1
Radius r ₁ with center within 4 (approximately 0.35mm is sufficient)
defined by an arc of radius r ₂ (approximately 0.75 mm) having the upper half of the inner circumferential surface 24 of the outer annular protrusion 14 centered inside the outer annular protrusion 14. It is stipulated that The radial thickness _t2 of the flat lower surface 26 is 0.60 to 0.80 as in the conventional case.
mm, and the flat lower surface 26 extends substantially perpendicular to the crown axis 18. The term "substantially vertical" as used herein is not limited to substantially vertical, but also includes slanting radially inward upward or downward at a slight angle of 10 degrees or less. do. The downward protrusion height _h2 of the outer annular protrusion 14 based on the center of the inner surface of the top wall 8 of the crown shell 4 is relative to the total height H of the crown shell 4 (Fig. 1).
0.218H to 0.251H, so for a crown shell with H=5.97mm, it may be 1.300 to 1.500mm. On the other hand, the minimum axial thickness x ₁ of the so-called valley between the inner annular protrusion 12 and the outer annular protrusion 14 ensures sufficient impact resistance etc. without excessively increasing the required amount of liner material. As in the conventional case,
Advantageously, it is between 0.20 and 0.40 mm. Also,
The axial thickness x ₂ of the thin central portion radially inward of the inner annular protrusion 12 may be 0.20 to 0.25 mm, and the thin central portion may be omitted if desired. Regarding the protruding heights of the inner and outer annular protrusions 12 and 14, if they are increased, the contact area will be wider and the elasticity will be increased, but the pressing force per unit area will be smaller and the bite against scratches will be smaller. It should be noted that the seal becomes weaker. The crown 2 as described above is fitted onto the mouth and neck of the bottle, applies a pressing force to bring the liner 6 into close contact with the mouth and neck, and deforms the lower part of the skirt wall 10 of the crown shell 4 radially inward. By at least locking into the locking jaws present on the outer circumferential surface of the mouth and neck,
It is glued to the mouth and neck to seal the mouth and neck. Figure 3 shows
1 and 2, the crown 2 shown in FIGS. 1 and 2 is shown attached to the neck 28 of a well-known glass bottle. As can be seen from FIG. 3, when the crown 2 is attached to the mouth and neck part 28 as required, the inner annular protrusion 12 of the liner 6 is brought into close contact with the inner periphery or central region of the top surface of the mouth and neck part 28, and the liner 6 The outer annular protrusion 14 is brought into close contact with the outer circumferential region or outer circumferential surface of the top surface of the mouth and neck portion 28 . Inner annular protrusion 12 and outer annular protrusion 1
4, it is noted that some air gap 30 remains between the liner 6 and the top surface of the mouth and neck. As the void 30 becomes smaller, the crimping area becomes larger, but the crimping force per unit area becomes smaller. The presence of the void 30 allows two specific areas to be crimped, and the crimping force per unit area of these areas to be a sufficient value. [Experimental Examples and Comparative Experimental Examples] Among the various liner forms examined, the forms disclosed in the above-mentioned Japanese Utility Model Publication No. 54-30123, Japanese Patent Publication No. 55-51793, and Japanese Utility Model Publication No. 55-31860 are shown below. Experimental results compared with the liner form of the present invention will be explained. Experimental example: Apply an epoxy protective lacquer to one side of a 0.27 mm thick chromic acid-treated steel sheet, and apply an epoxy paint containing polyethylene oxide to the other side.
An intermediate crown shell (total height H = 5.97 mm, inner diameter D = 26.5 mm) was molded so that the surface coated with the oxidized polyethylene-containing epoxy paint was the inner surface. Next, the crown shell is preheated to 150°C, and molten high-pressure polyethylene (density 0.92, melt index 4.5) at 170°C is coated on the inner surface of the top wall of the crown shell.
After that, it was pressed and molded using a molding punch to form a liner having the shape shown in FIGS. 1 and 2. The dimensions of the liner were as follows (see Figures 1 and 2). d ₁ = 19.50mm d ₂ = 25.50mm α = 45 degrees t ₁ = 1.00mm t ₂ = 0.70mm r ₁ = 0.35mm r ₂ = 0.75mm h ₁ = 1.30mm h ₂ = 1.40mm x ₁ = 0.30mm x ₂ = 0.23mm The crown completed as described above was attached to a commercially available beer bottle (large) with a chipped outer bottle, a chipped inner bottle, and a bottle with a broken top, all of which had artificially created scratches on the mouth and neck. , the sealing properties were inspected. As shown in Figures 4-A and 4-B, the outer chipped bottle has a chip A in the outer peripheral area of the top surface of the mouth and neck, and the inner chipped bottle has a chip A in the outer peripheral area of the top surface of the mouth and neck, as shown in Figures 4-A and 4-B.
As shown in Figures 6-A and 6-B, the bottle has a notch B in the inner peripheral region of the top surface of the mouth and neck, and the top of the bottle has a chipped part B as shown in Figures 6-A and 6-B. It had a chip C in the central region. The quality of the sealing property is determined by the theoretical internal pressure of 2.7 vol. (vol. is a unit that indicates the amount of carbon dioxide contained)
The state in which 100 c.c. contains 100 c.c. of carbon dioxide gas is
1vol., which indirectly displays the pressure inside the bottle, e.g.
2.7vol. at 65℃ corresponds to an internal pressure of approximately 7Kg/ ^cm2 )
Fill the bottle with beer and seal the neck of the bottle with a crown, then immerse the entire bottle in warm water at 65℃ for 60 minutes. If bubbles leak from the bottle during this time, It was determined that the sealing characteristics were poor. As a result of testing the sealing properties of 30 crowns for each of the bottles with a chipped outside, a bottle with a chipped inside, and a bottle with a chipped top, as shown in Table 1 below, there were zero sealing property defects for any of the bottles. Comparative Example 1 A crown was manufactured under the same conditions as in the experimental example, except that the liner had the shape shown in FIG. 7 in accordance with the disclosure of Japanese Utility Model Publication No. 54-30123. In addition, in FIG. 7, the liner form in the experimental example is shown by a two-dot chain line in order to clearly show the difference in liner form. The dimensions of the liner were as follows (see Figure 7). d ₁ = 19.00 mm d ₂ = 24.80 mm α = 47 degrees β = 43 degrees h ₁ = 1.30 mm h ₂ = 1.50 mm x ₁ = 0.50 mm x ₂ = 0.23 mm Sealing characteristics similar to the experimental example for such a crown The results of the tests were as shown in Table 1 below. Comparative Experimental Example 2 A crown was manufactured under the same conditions as in the experimental example except that the liner form was as shown in FIG. 8 in accordance with the disclosure of Japanese Patent Publication No. 55-51793. Similar to Fig. 7, Fig. 8 shows two liner forms in the experimental example in order to clearly show the difference in liner form.
Indicated by a dotted chain line. The dimensions of the liner were as follows. (8th
(see figure). d ₁ = 18.50mm d ₂ = 25.00mm α = 45 degrees β = 50 degrees t ₂ = 0.9mm h ₁ = 1.25mm h ₂ = 1.40mm x ₁ = 0.30mm x ₂ = 0.23mm Experimental example for such a crown The results of carrying out the same sealing property test as in Table 1 below were as shown in Table 1 below. Comparative Experimental Example 3 A crown was manufactured under the same conditions as in the experimental example, except that the form of the liner was as shown in FIG. 9 in accordance with the disclosure of Japanese Utility Model Publication No. 55-32860. Similar to FIGS. 7 and 8, FIG. 9 also shows the liner form in the experimental example with a two-dot chain line in order to clearly show the difference in liner form. The dimensions of the liner were as follows (see Figure 9). d ₁ = 18.00mm d ₂ = 25.00mm d ₃ = 21.50mm α = 45 degrees t ₁ = 0.70mm t ₂ = 0.60mm h ₁ = 1.25mm h ₂ = 1.50mm h ₃ = 0.85mm x ₁ = 0.35mm x ₂ = 0.23mm The sealing properties of such a crown were tested in the same manner as in the experimental example, and the results were as shown in Table 1 below. 【table】

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a preferred embodiment of a crown constructed according to the present invention. FIG. 2 is a partial sectional view showing a part of the crown of FIG. 1. FIG. 3 is a sectional view showing the state in which the crown shown in FIG. 1 is attached to the neck of the bottle. Fourth
Figure-A and Figure 4-B, Figure 5-A and Figure 5-B
Figure 6-A and Figure 6-B are a plan view and a cross section showing the mouth and neck of the outer chipped bottle, the inner chipped bottle, and the top chipped bottle used in the experimental examples and comparative experiment examples 1 to 3, respectively. figure. Figures 7, 8, and 9 are, respectively,
A partial sectional view showing a part of the crown used in Comparative Experimental Examples 1 to 3. 2... Crown, 4... Crown shell, 6... Liner,
8...Top wall, 10...Skirt wall, 12...Inner annular protrusion, 14...Outer annular protrusion, 16...Inner peripheral surface of inner annular protrusion, 18...Crown axis, 20...
...Outer circumferential surface of the inner annular protrusion, 22... Outer circumferential surface of the outer annular protrusion, 24... Inner circumferential surface of the outer annular protrusion, 26
...Flat lower surface of outer annular ridge.

Claims (1)

[Claims for Utility Model Registration] A metal crown shell having a top wall and a skirt wall hanging from its periphery, and a synthetic resin sealing liner disposed on the inner surface of the top wall of the crown shell, the liner has concentric inner and outer annular ridges, and the inner annular ridge extends upwardly at an angle α of 40 to 50 degrees with respect to the crown shell axis and an inner circumferential surface extending substantially parallel to the crown axis. an outer circumferential surface that extends radially outwardly, and has a downward protruding height.
h ₁ is 0.205H to the total height H of the crown shell
0.235H, and the outer annular protrusion has a lower half defined by an arc having its center within the outer annular protrusion, and an upper half defined by an arc having its center inside the outer annular protrusion. and a flat lower surface extending substantially perpendicular to the crown shell axis;
The downward protrusion height _h2 is relative to the total height H of the crown shell.
In a crown whose radial thickness _t2 of the flat lower surface is set to 0.218 to 0.251H and 0.60 to 0.80mm, the inner diameter _d1 of the inner annular protrusion is relative to the inner diameter D of the crown shell. The outer diameter _d2 of the outer annular protrusion is set to 0.952D to 0.972D with respect to the inner diameter D of the crown shell, and the radial direction of the outer annular protrusion is set to 0.720D to 0.750D. Average thickness _t1 is 0.80 to 1.20mm
A crown characterized by: