JPS5935762B2 - An embossing tool for embossing the liner on the inside of the top surface of the container lid shell. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an embossing tool for stamping a liner on the inside of the top surface of a container lid shell, and more specifically to a container lid having a bottom surface and a skirt that hangs down from the periphery of the top surface. The present invention relates to an embossing tool for embossing a liner material supplied to the inside of the top surface of a shell into a liner having at least one annular projection.

Container lids for sealing the openings of containers such as bottles or cans;
For example, Crown, P. i). Caps, screw caps, and various types of easy-to-open container lids have conventionally consisted of a container lid shell that has a top surface and a skirt that hangs down from the periphery of the top surface, and a container lid shell that is disposed inside the top surface of the shell. Types with a liner made of a synthetic resin material such as polyolefin or vinyl chloride are widely used in practice. The liner for this type of container lid is generally produced by supplying the liner material in a heated and molten state to the inside of the top surface of the container lid shell, and then inserting an embossing tool into the container lid shell to form the liner material as required. It is conveniently molded by stamping into the shape of
447 Publication, Utility Model Publication No. 47-3515, Japanese Unexamined Patent Publication No. 1973
No. 2-110176, Japanese Unexamined Patent Application Publication No. 1989-89583, or Japanese Patent Application No. 1983-149 filed by the present applicant.
(See the '937 specification and drawings).

Liners formed by such embossing generally include at least one annular protrusion that is brought into close contact with the outer, top, or inner circumference of the container opening, usually at least one annular protrusion at the container opening. It has at least two concentric annular projections, an outer annular projection and an inner annular projection, which are brought into close contact with the outer peripheral surface and the inner peripheral surface, respectively. As is well known to those skilled in the art, a container lid equipped with a liner having an annular protrusion as described above has a high degree of sealing strength against the opening of the container, as well as the ability to remove the container lid that is hermetically attached to the opening of the container. The protrusion height of the annular protrusion has a large effect on the torque required to open the opening of the container. As the amount of protrusion of the annular protrusion increases, the sealing strength against the opening of the container generally increases, and the torque required to open the container also increases. Conversely, when the protruding height of the annular projection is reduced, the sealing strength against the container opening is generally reduced and the required torque during opening is reduced. On the other hand, the optimal values of the sealing strength and the torque required for opening vary depending on the contents to be filled in the container to be sealed or the type of the container lid.

For example, if the content is a carbonated drink, it is necessary to have a relatively high sealing strength, but if the content is an alcoholic drink such as whiskey, a relatively high sealing strength is required. I don't. In addition, in the case of a screw-on container lid that does not have the so-called pilfer-proof property, it is desirable to have a relatively large torque required for opening the container, whereas with a screw-on cap that does not have the so-called pilfer-proof property. In the case of container lids, it is often desired that the torque required to open the lid be relatively small. As mentioned above, depending on the content to be filled in the container to which the container lid is applied, and also depending on the type of container lid, the above-mentioned It is strongly desired to appropriately change the amount of protrusion of the annular protrusion and thus adjust the sealing strength against the opening of the container and the required torque for opening to desired values.

However, in the conventional embossing tool used for embossing the liner as described above, the annular shape of the liner is affected by the shape of the embossing tool itself, as will be explained in detail later with reference to the attached drawings. The protrusion height of the protrusion is uniquely defined, and therefore, in order to change the protrusion height of the annular protrusion on the liner, a new and fairly expensive embossing tool must be manufactured each time.

The present invention has been made in view of the above-mentioned facts, and its main purpose is to remove at least one liner material supplied to the inside of the top surface of a container lid shell having a top surface and a skirt hanging from the periphery of the top surface. This is an embossing tool for embossing a liner having annular protrusions, and by simply changing the amount of liner material supplied to the inside of the top surface of the container lid shell, the liner to be extruded can be The protrusion height of the at least one annular projection is varied and therefore the protrusion height of the at least one annular projection in the liner to be stamped can be changed very simply and easily, without the need for preparing a separate embossing tool. It is an object of the present invention to provide a new and superior embossing tool that allows for desired adjustment of the embossing tool.

According to the present invention, as an embossing tool that achieves the above main purpose, a liner material supplied to the inside of the top surface of a container lid shell having a top surface and a skirt hanging from the periphery of the top surface,
An embossing tool for stamping a liner having at least one annular projection; at least one annular portion whose distal end surface defines a projecting surface of the annular projection; It is mounted so as to be movable over a predetermined range in the direction and is biased toward the inside of the top surface of the shell, and during stamp molding, the portion other than the annular portion is moved toward the inside of the top surface of the shell. However, the annular portion is configured such that its position relative to the inside of the top surface of the shell changes depending on the amount of liner material supplied to the inside of the top surface of the shell. When the amount of liner material supplied to the inside of the top surface of the shell changes, only the protruding height of the annular protrusion changes accordingly, and the dimensions of other parts do not substantially change. An embossing tool is provided which is characterized by embossing the inside.

Other objects of the invention will become apparent from the following description with reference to the accompanying drawings.

For a better understanding of the present invention, first of all, referring to FIG. 1, a conventional embossing tool used for embossing a liner will be explained. The container lid shell 2, which is formed from a metal plate such as a chromium-treated steel plate and has a circular top surface 4 and a cylindrical skirt 6 hanging from the circular top surface 4, is in an inverted state, that is, with the inside of the top surface facing upward. Anvil 8
positioned above. Then, while the container lid shell 2 is on the anvil 8, an embossing tool, generally designated by the number 10, is lowered to the position shown in the figure. A liner material, which is a polyolefin resin such as polyethylene or a suitable synthetic resin material such as polyvinyl chloride, is molded by stamping, and has at least one annular protrusion on the inner side of the top surface of the container lid shell 2, or an outer annular protrusion in the case shown. 2 of the protrusion 14 and the inner annular protrusion 16
A liner 12 is formed having annular protrusions. The embossing tool 10 includes three elements: a center punch 18;
It consists of an intermediate bushing 20 and an outer sleeve 22.

The center punch 18 is connected to a suitable elevating mechanism (not shown), and is lowered to the illustrated position during embossing. Further, a number L introduction passage 24 and a discharge passage 26 are formed in the center punch 18, and a cooling fluid such as water or a heating fluid is circulated through the introduction passage 24 and the discharge passage 26 during stamp molding. It's becoming like that. The outer sleeve 22 is attached to the center punch 1.
8 so as to be movable in the axial direction (that is, in the vertical direction in FIG. 1). A relatively strong spring 32 is interposed between an upper shoulder 28 formed on the center punch 18 and an annular flange 30 fixed near the upper end of the inner surface of the outer sleeve 22. Due to the elastic biasing action of the spring 32, the center punch 18 is elastically biased downward in the axial direction. The axial downward movement of the outer sleeve 22 with respect to the center punch 18 is caused by the annular flange 3
an annular flange 34 fixed to the center punch 18;
limited by contact with. Intermediate pushing 2
0 is disposed between the center punch 18 and the outer sleeve 22 so as to be movable in the axial direction with respect to either of these two elements. A relatively weak spring 40 is interposed between the lower shoulder 36 formed on the center punch 18 and the upper end surface 38 of the intermediate pushing 20, and the intermediate bushing 20 responds to the elastic biasing action of the spring 40. Therefore, it is biased downward in the axial direction with respect to the center punch 18. Movement of the intermediate pushing 20 downward in the axial direction. A shoulder 42 formed near the upper end of the L intermediate pushing 20 abuts against a shoulder 44 formed on the inner circumferential surface of the outer sleeve 22 . In the conventional embossing tool 10 configured as described above, an elevating mechanism (not shown) is used during embossing.
When the center punch 18 is lowered to the position shown by the outer sleeve 22, the relatively strong spring 32
It is biased downward in the axial direction by the elastic biasing action of, and its tip, that is, its lower end is brought into contact with the inner surface of the container lid shell 2.

On the other hand, the intermediate bushing 20 is also biased downward in the axial direction by the elastic biasing action of the spring 40.
is weaker than the spring 32 described above, the intermediate bushing 20 has a lower end surface and a container lid shell 2.
Due to the action of the liner material flowing between the inside of the top surface of the container lid shell 2, the liner material is moved against the biasing action of the spring 40, and thus the lower end surface of the intermediate pushing 20 and the inside of the top surface of the container lid shell 2 are moved. In between, an outer annular projection 14 and an inner annular projection 16 are formed that correspond to the shape of the lower end surface of the intermediate bushing 20 and project together with the annular base 46 of the liner 12 from the annular base 46 . Thus, in a container lid comprising a container lid shell 2 and a liner 12 stamped as described above, at least one annular protrusion of the liner 12, in the illustrated case an outer annular Protrusion 14
and the inner annular projection 16, the protrusion height h of the two annular projections
l and H2 have a large influence on the sealing strength for the opening of the container to be sealed and the required torque when opening the container, but when using the conventional embossing tool 10 as described above, the protrusion height hl and H2 is uniquely defined by the shape of the lower end surface of the intermediate pushing 20, and the protrusion height H and/or H2 cannot be changed as necessary.

Even if the above-mentioned protrusion height hl and/or H2 is changed by changing the amount of liner material supplied to the inside of the top surface of the protrusion lid shell 2, as is easily understood, the supply of liner material When the amount is increased, the annular base 46
The thickness t of the annular base 46 only increases when the supply amount of the liner material is decreased, and the thickness t of the annular base 46 only decreases in either case, the protrusion heights H and H2 change completely. do not. Next, with reference to FIG. 2, a first specific example of the embossing tool improved according to the present invention will be described.

The embossing tool 110 shown in FIG. 2 has the following improvements over the conventional embossing tool 10 shown in FIG. 1.

That is, in the embossing tool 110 shown in FIG. 2, the lower part of the center punch 118 corresponds to the center punch 1 shown in FIG.
The liner 11 has a larger diameter than the lower part of the liner 8.
The region of the inner annular projection 116 of No. 2, and the inner annular projection 11
6 and the outer annular protrusion 114, the peripheral edge of the tip surface, that is, the lower end surface of the center punch 118 and the container lid shell 1
02 and the inner side of the top surface of liner 1.
The shape of the region other than the outer annular projection 114 in 12 is as follows:
All of them are defined by the lower end surface of the center punch 118. On the other hand, the intermediate bushing 120 has a reduced thickness in the radial direction by increasing its inner diameter compared to the intermediate bushing 20 shown in FIG. No. A between the inside of the top surface of the container lid shell 102
Only the region of the outer annular projection 114 of the liner 112 is configured. In other words, between the center punch 118 and the outer sleeve 122, these two
It is arranged to be movable in the axial direction with respect to any of the elements, and is biased downward in the axial direction (that is, in the direction toward the inner side of the container lid shell 102) by the elastic biasing action of a relatively weak spring 140. The distal end surface, that is, the lower end surface of the intermediate bushing 120 is connected to the outer annular projection 114 of the liner 112
Only the shape of the protruding surface is specified. The configuration of the embossing tool 110 shown in FIG. 2 other than those described above is substantially the same as the conventional embossing tool 10 shown in FIG. 1, so a description of this configuration will be omitted.

Also in the embossing tool 110 shown in FIG. 2 which has been improved according to the present invention, during embossing, the center punch 118 is moved to the illustrated position by an elevating mechanism (not shown). be forced to descend to

Thus, the outer sleeve 122 has a relatively strong spring 1
is biased downward in the axial direction by the elastic biasing action of 32,
The tip or lower end thereof is brought into contact with the inner surface of the container lid shell 102. On the other hand, the intermediate bushing 120 also has a spring 140.
However, since this spring 140 is weaker than the spring 132 described above, the intermediate bushing 120 is biased downwardly in the axial direction by the elastic biasing action of the liner 112.
The biasing action of the spring 140 is resisted by the action of the liner material flowing between the distal end surface, that is, the lower end surface defining the protruding surface of the outer annular projection 114 and the inside of the top surface of the container lid shell 102. and is moved upward in the axial direction. In the embossing tool 110 shown in FIG. 2, an intermediate bushing 120 is moved upward in the axial direction according to the amount of liner material flowing between the lower end surface of the embossing tool 110 and the inside of the top surface of the container lid shell 102. corresponds only to the area of the outer annular projection 114 of the liner 112.

Therefore, by varying the amount of liner material supplied to the inside of the top surface of the container lid shell 102, the spring 1
By varying the amount of movement of the intermediate bushing 120 that moves upward in the axial direction against the elastic biasing action of the liner 112, as can be easily understood from FIG. Projection height h of outer annular projection 114
Only l changes; the dimensions of other portions of liner 112, including the thickness of annular base 146, remain substantially unchanged. Accordingly, when embossing the liner 112 using the embossing tool 110 improved in accordance with the present invention, the liner 112 may simply be extruded from, for example, a suitable extruder and embossing. The protrusion of the outer annular protrusion 114 in the liner 112 can be extremely simply and easily molded by pressing only by appropriately changing the amount of liner material supplied to the inside of the top surface of the container lid shell 102 prior to molding. Height H
, can be adjusted to any desired value without substantially changing the dimensions of other portions of the liner 112. FIG. 3 illustrates a second embodiment of an embossing tool improved in accordance with the invention.

The embossing tool 210 shown in FIG. 3 has the following improvements over the conventional embossing tool 10 shown in FIG. 1.

That is, in the embossing tool 210 shown in FIG. 3, the outer sleeve 222 is formed of a first member 222a and a second member 222b that are interconnected by a mutually threaded portion 223, In addition to the tip that rests against the inside of the container lid shell 202 during embossing, it additionally has a portion 225 located radially inward of such tip, and the liner 2
12 outer annular protrusions 214 and outer annular protrusions 2
14 and the inner annular projection 216 is configured to be formed between the lower end surface of the additional portion 225 of the outer sleeve 222 and the inner top surface of the container lid shell 202. On the other hand, the intermediate bushing 220 has a reduced thickness in the radial direction by reducing its outer diameter compared to the intermediate bushing 20 shown in FIG. and the inside of the top surface of the container lid shell 202, the liner 21
Only the area of the inner annular projection 216 of No. 2 is formed. In other words, it is disposed between the center punch 218 and the outer sleeve 222 so as to be movable in the axial direction with respect to either of these two elements, and by the elastic biasing action of the relatively weak spring 240. Direction downward (
In other words, the tip or lower end surface of the intermediate pushing 220, which is biased toward the inside of the top surface of the container lid shell 202, defines only the shape of the protruding surface of the inner annular projection 226 of the liner 212. The embossing tool 210 shown in FIG. 3 is further defined by two members forming an outer sleeve 222, a first member 222a and a second member 222b, and sealed by a sealing ring 22T. Cooling or heating fluid is introduced into the annular space 229 through the introduction pipe 231 and the introduction hole 233, and after this fluid circulates through the annular space 229, the discharge hole 2
An additional improvement is that it is configured to be discharged through 35 and discharge pipe 231. The configuration of the embossing tool 210 shown in FIG. 3 other than the above is substantially the same as the conventional embossing tool 10 shown in FIG.
A description of this configuration will be omitted.

When embossing the liner 212 using the embossing tool 210 shown in FIG. The protruding height H2 of the inner annular protrusion 216 in the liner 212, which is extremely simply and easily molded by stamping, can be set by appropriately changing the amount of material.
It will be readily understood, without further elaboration, that the dimensions of the other portions of the liner 212 may be adjusted to any desired value without substantially changing the dimensions.

FIG. 4 illustrates a third embodiment of an embossing tool improved according to the invention.

The embossing tool 310 shown in FIG. 4 has the following improvements over the conventional embossing tool 10 shown in FIG. 1.

That is, in the embossing tool 310 shown in FIG.
3 of 0a, second member 320b and third member 320c
It is composed of individual members. The first member 320a is
Although it is fitted into the lower part of the center punch 318 so as to be movable in the axial direction, the center punch 31f is inserted into the lower part of the center punch 318 during stamping.
3 is lowered to the illustrated position, its upper end surface 338 abuts against the lower shoulder 336 of the center punch 318, preventing it from moving in the axial direction. It is securely held in the position shown. The lower portion of the first portion 320a extends downward between the second portion 320b and the third portion 320c, and is located between the top surface of the container lid shell 302 and the outer surface of the liner 312. A region is formed between the annular projection 314 and the inner annular projection 316. Note that instead of being automatically and freely fitted into the center punch 318 in the axial direction, the first portion 320a is fixed to the center punch 318 or fixed to the center punch 318 so that it cannot move relative to the center punch 318. It may be formed integrally with this,
Alternatively, it may be fixed to or integrally formed with outer sleeve 322. On the other hand, the second member 320b is disposed outside the lower part of the first member 320a so as to be movable with respect to the first member 320a, and the third member 320c is disposed outside the lower part of the first member 320a. First member 3 inside the lower part
It is arranged to be movable with respect to 20a.

The second member 320b and the third member 320c extend in the radial direction through each of a plurality of holes 339 formed at intervals in the circumferential direction at the lower part of the first member 320a. They are interconnected by a plurality of connecting pins 341. Each of the plurality of holes 339 is an elongated hole extending over a predetermined length in the axial direction, and
0b and the third member 320c are connected to the first member between the position where the connecting pin 341 that interconnects them abuts the upper end of the hole 339 and the position where the lower end of the hole 339 abuts. 320a, therefore the center punch 31
8 and outer sleeve 322 as well. The distal end surface, that is, the lower end surface of each of the second member 320b and the third member 320c as described above is connected to the outer annular projection 314 of the liner 312 to be stamped.
The shape of the protruding surface of the inner annular projection 316 and the shape of the protruding surface of the inner annular projection 316 are defined. In other words, the liner 312 is placed between the lower end surface of the second member 320b and the inside of the top surface of the container lid shell 302.
A region of an outer annular projection 314 of the third member 3 is formed.
A region of an inner annular projection 316 of the liner 312 is formed between the lower end surface of the liner 20c and the inner top surface of the container lid shell 302. In the embossing tool 310 shown in FIG. 4, further:
The relatively weak spring 340 is connected to the first
is interposed between the shoulder portion 343 of the member 320a and the upper end surface 345 of the second member 320b, and is not the entire intermediate bushing 320, but the second member 320b.
and its third portion connected thereto by a connecting pin 341.
Only the member 320c is elastically biased downward in the axial direction.

The structure of the embossing tool 310 shown in FIG. 4 other than the above is as follows.
Since it is substantially the same as the conventional embossing tool 10 shown in FIG. 1, details regarding this configuration will be omitted. In the embossing tool 310 shown in FIG. 4 which has been improved according to the present invention, the center punch 318 is lowered to the illustrated position by an elevating mechanism (not shown) during embossing. When loaded, the first member 320a of the intermediate sleeve 320, along with the outer sleeve 322, are reliably positioned in the position shown in FIG. 4 regardless of the amount of liner material.

In contrast, the second member 320 of the intermediate sleeve 320
b and the third member 320c move upward in the axial direction against the biasing action of the spring 340 in response to the liner material flowing between the respective tip surfaces, that is, the lower end surfaces and the inside of the top surface of the container lid shell 302. be forced to move. Because it depends on this,
When stamping the liner 312 using the stamping tool 310 shown in FIG.
The outer annular protrusion 31 of the liner 312 can be formed by stamping extremely simply and easily by appropriately changing the amount of liner material supplied to the inside of the top surface of the liner 312.
4 protrusion height H, and the protrusion height H2 of the inner annular protrusion 316.
It will be apparent that both can be adjusted to any desired value without substantially changing the dimensions of other portions of liner 312.

In the first to third specific examples described above, the intermediate sleeves 120 and 220, and the second member 320b and third member 320c of the intermediate sleeve 320 are If desired, the springs 140, 240 and 340 described above may be omitted and the intermediate sleeves 120 and 220 and the intermediate sleeve 32
The second member 320b and the third member 320c may be biased downward in the axial direction only by their own weight.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional embossing tool, and FIG. 2 is a sectional view showing a first specific example of the embossing tool of the present invention. FIG. 3 is a sectional view showing a second specific example of the embossing tool of the present invention. FIG. 4 is a sectional view showing a third specific example of the embossing tool of the present invention. 102,202,302... Container lid shell, 110,210,310... Embossing tool,
112,212,312...Liner, 114
,214,314...Outer annular projection, 116,
216,316...Inner annular projection, 118,2
18,318... Center punch, 120,2
20,320... intermediate bushing, 122,2
22,322...Outer sleeve.

Claims (1)

[Scope of Claims] 1. A liner material supplied to the inside of the top surface of a container lid shell having a top surface and a skirt hanging from the periphery of the top surface is press-molded into a liner having at least one annular protrusion. at least one annular portion whose distal end surface defines the protruding surface of the annular projection is mounted so as to be movable over a predetermined range in the axial direction relative to the other portions; The annular portion is biased in a direction toward the inside of the top surface of the shell, and during stamp molding, the portions other than the annular portion are always positioned in a predetermined relationship with respect to the inside of the top surface of the shell. The shell is configured such that the position of the shell with respect to the inside of the top surface changes depending on the amount of liner material supplied to the inside of the top surface of the shell, and the amount of liner material supplied to the inside of the top surface of the shell changes. The embossing tool is characterized in that when the change occurs, only the protruding height of the annular protrusion changes, and the dimensions of other portions do not substantially change.A liner is formed by embossing inside the interface of the shell. 2. A liner having at least two concentric annular protrusions, an outer annular protrusion and an inner annular protrusion, is molded by stamping, the tip of which defines the protruding surface of the outer annular protrusion. The part is attached so as to be movable over a predetermined range in the axial direction with respect to other parts, and is biased in a direction toward the inside of the top surface of the shell, and the part other than the annular part during stamp molding. is always positioned in a predetermined relationship with respect to the inside of the top surface of the shell, but the position of the annular portion relative to the inside of the top surface of the shell changes depending on the amount of liner material supplied to the inside of the top surface of the shell. When the amount of liner material supplied to the inside of the top surface of the shell changes, only the protruding height of the outer annular protrusion changes accordingly, and the dimensions of other parts substantially change. 2. The embossing tool according to claim 1, wherein a liner that does not change in color is stamped on the inside of the top surface of the shell. 3. A liner having at least two concentric annular protrusions, an outer annular protrusion and an inner annular protrusion, is molded by stamping, the annular shape having a tip defining the protruding surface of the inner annular protrusion. The part is attached so as to be movable over a predetermined range in the axial direction with respect to other parts, and is biased in a direction toward the inside of the top surface of the shell, and the part other than the annular part during stamp molding. is always positioned in a predetermined relationship with respect to the inside of the top surface of the shell, but the position of the annular portion relative to the inside of the top surface of the shell changes depending on the amount of liner material supplied to the inside of the top surface of the shell. When the amount of liner material supplied to the inside of the top surface of the shell changes, only the protruding height of the inner annular protrusion changes accordingly, and the dimensions of other parts substantially change. 2. The embossing tool according to claim 1, wherein a liner that does not change in color is stamped on the inside of the top surface of the shell. 4. A liner having at least two concentric annular protrusions, an outer annular protrusion and an inner annular protrusion, is molded by stamping, the tip of which defines the protruding surface of the outer annular protrusion. The first annular portion and the second annular portion whose tip defines the protruding surface of the inner annular projection are integrally movable relative to the other portions over a predetermined range in the axial direction. mounted and biased in a direction toward the inside of the top surface of the shell, and during stamp molding, parts other than the first and second annular portions always maintain a predetermined relationship with the inside of the top surface of the shell. However, the first and second
The annular portion is configured such that its position relative to the inside of the top surface of the shell changes depending on the amount of liner material supplied to the inside of the top surface of the shell, and the liner material supplied to the inside of the top surface of the shell changes. When the amount of material changes, the protrusion height of the outer annular projection and the inner annular projection changes accordingly, but the dimensions of other parts do not substantially change.A liner is molded on the inside of the top surface of the shell. An embossing tool according to claim 1. 5. The annular portion mounted so as to be movable in the axial direction relative to the other portion is moved toward the inside of the top surface of the shell by the action of a spring interposed between the other portion and the annular portion. An embossing tool according to any one of claims 1 to 4, wherein the embossing tool is elastically biased in a direction.