JPH0744610Y2 - cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a cap that is opened by pulling a pulling ring and breaking along a line of weakness, a so-called lip cap.

"Prior Art" FIGS. 6 to 8 show an example of a lip cap. The cap is roughly composed of a cap body 2 made of metal such as aluminum, a pulling ring 3 integrally formed with the cap body 2, and a packing 4 provided on the inner surface of the cap body 2.

The cap body 2 includes a disc-shaped top plate portion 5 and the top plate portion 5.
And a cylindrical portion 6 that hangs from the peripheral edge of the. The pulling ring 3 is composed of a tongue portion 7 that is connected to the lower end edge of the tubular portion 6 of the cap body 2 and a ring portion 8 that is formed at the tip of the tongue portion 7. The tongue portion 7 is a thin plate-like member that hangs down from the lower end edge of the tubular portion 6 and is bent outward at the bending portion 9, and the ring portion 8 is a circle formed at the tip of the tongue portion 7. It is a ring.

A pair of weakening lines 10, 10 are formed on the tubular portion 6 and the top plate portion 5 of the cap body 2. The weakening line 10 includes a starting end portion 10A which rises the tubular portion 6 following the side edge 7A of the tongue portion 7 of the pulling ring 3, an intermediate portion 10B formed on the top plate portion 5, and
It is formed by a terminating portion 10c formed at a position on the opposite side of the pulling ring 3 of the tubular portion 6. As the packing 4, a disk-shaped packing made of a synthetic resin such as soft polyethylene which is excellent in food hygiene is used. The packing 4 is arranged so as to contact the inner surface of the cap body 2. The packing 4 is firmly adhered to the top plate portion 5 at a position A (a portion surrounded by a diagonal line in FIG. 6 and a portion shown by a thick line in FIG. 8) apart from the pulling ring 3 (hereinafter, this The portion is referred to as the adhesive portion A). The portion of the packing 4 close to the pulling ring 3 is not adhered or is weakly adhered to the extent that the packing 4 is peeled off from the top plate portion 5 when the plug is opened. The reason why the packing 4 is adhered in this way is to improve the opening property of the cap.

In order to attach the cap 1 to the bottle, after covering the bottle mouth with the cap 1, the lower end portion of the tubular portion 6 is caulked to be locked to the lip portion of the bottle mouth which bulges annularly.

To remove the cap 1 from the bottle mouth, as shown in FIG. 9, the ring portion 8 of the pulling ring 3 is pulled upward. Then, the cap body 2 is broken along the weakening lines 10 and 10 and divided into three parts. That is, the portion to be cut 15 sandwiched between the weakening lines 10 and 10 and the residual pieces 16 and 16 outside the weakening lines 10 and 10.
Is divided into and Since the packing 4 is not adhered to the top plate portion 5 on the side of the pulling ring 3, the packing 4 remains at the bottle mouth B at the initial stage of the breakage of the weakening lines 10 and 10, and only the cut portion 15 is pulled up. When the breakage of the weakening lines 10,10 reaches the adhesive portion A, the packing 4 is pulled up together with the cut portion 15, the remaining pieces 16,16 are then raised, and finally the cap is removed from the bottle mouth B. .

[Problems to be solved by the invention] The conventional cap has an advantage that opening is easy,
It was mainly used to close bottles with high internal pressure filled with carbonated drinks.

However, when this type of cap is used to close a bottle containing a coffee, oolong tea, or other beverage filled with heat, a so-called hot product, the liquid shrinks as the filled beverage cools. Due to the strong suction force generated in the space above the bottle, the packing 4 is likely to be sucked into the bottle and come off the sealing surface of the bottle mouth B. Therefore, the conventional cap has a problem that it cannot be used to close a bottle filled with hot material.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a lip cap which has a good opening property and also exhibits a good sealing property for a container filled with a hot product.

[Means for Solving the Problem] In the cap of the present invention, the middle portion of the weakening line is formed at the top end of the curved surface of the shoulder formed by the top plate and the cylinder (hereinafter, referred to as
(Abbreviated as a start end) or closer to the tubular portion than the start end, and firmly adheres the entire portion located inside the weakening line of the packing to the top plate portion and the weakening line of the packing. When pulling up the part located on the outside while separating the top plate part of this cap attached to the bottle mouth along the weakening line, the residual piece that remains on the bottle mouth by being pulled by the part located inside the weakening line of the packing The above object was achieved by setting the cap to be in a non-adhesive state so as to be pulled out from the cap.

Here, the middle portion of the weakening line is the portion between the starting end portion formed on the side where the tensile ring of the tubular portion is continuously provided and the terminal end portion formed on the side of the tubular portion that faces the tensile ring. Show.

In addition, here, the starting end of the curved surface of the shoulder means the starting end on the side of the top plate of the curved surface of the shoulder formed by the top plate of the cap and the cylinder before being bonded to the bottle mouth.

Further, firmly bonding means that the packing is bonded with an adhesive force that can prevent the packing from being sucked into the bottle mouth. When the packing is adhered to the top plate with such an adhesive force, the packing does not separate from the top plate even when the package is opened.

"Operation" If the middle portion of the weakening line is provided along the starting end portion of the shoulder portion formed by the top plate portion and the tubular portion, or on the tubular portion side from the starting end portion,
The middle part of the weakening line is located outside the opening of the bottle mouth. Therefore, if the entire portion of the packing located inside the weakening line is firmly adhered to the top plate portion of the cap body, the portion of the packing located at the opening of the bottle mouth cannot be separated from the top plate portion. Therefore, in the cap of the present invention, the packing is not sucked even if the suction force generated when the hot material filled in the bottle cools acts on the packing.

Further, in the cap of the present invention, since the intermediate portion of the weakening line is provided along the starting end portion of the curved surface of the shoulder portion or on the cylinder portion side from the starting end portion, the cap can be easily opened. The present inventors consider the reason as follows.

Since the middle part of the weakening line is formed at the beginning of the curved surface of the shoulder or at the outside of it, the inner end of the part that becomes the residual piece when opening is inclined upward inward ( The state is that when opening the plug, the inner end of the residual piece is pulled up when pulling up and cutting the part to be cut,
It becomes more prominent when the stopper is opened). Therefore, the portion of the packing that is pulled up together with the cut portion when the plug is opened is pressed from directly above, and the resistance that occurs when pulling up the packing is reduced.

Further, since the inner end portion of the residual piece is inclined upward inward, the tendency that the tubular portion is pulled upward by the packing that is pulled up at the time of opening the plug is eliminated. As a result, the tendency of the tail-wound portion of the tubular portion to be pressed against the lower end portion of the lip portion of the bottle mouth at the time of opening the cap is eliminated, and the portion is easily detached from the lower end portion of the lip portion of the bottle mouth.

The cross-sectional shape of the residual piece is conventionally a deep J-shape, but it becomes a shallow bow shape in the present invention, and the rigidity of the residual piece is weakened, so that the residual piece is easily deformed outward.

"Embodiment" (Embodiment 1) An embodiment of the cap of the present invention will be described below with reference to FIGS. The same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

Reference numerals 20 and 20 in FIGS. 1 to 4 denote weakening lines. The weakening line 20 includes a starting end portion 20A formed on the side where the tensile ring 3 of the tubular portion 6 is continuously provided, an end portion 20C formed on a side of the tubular portion 6 that faces the tensile ring 3, and those It is formed with an intermediate portion 20B sandwiched therebetween.

The intermediate portion 20B of the weakening line 20 is formed along the starting end portion 26 of the curved surface of the shoulder portion 24 formed by the top plate portion 5 and the tubular portion 6 on the top plate portion 5 side. The start end 20A and the end 20C of the weakened line 20 are
A curved line is drawn from the middle portion 20B to the outside, and reaches the tubular portion 6. The intermediate portion 20B of the weakened line 20 is located outside the highest portion of the sealing surface C of the bottle mouth B when the cap is attached to the bottle mouth B. Naturally, the middle portion 20B of the weakening line B is located outside the opening D of the bottle mouth B.

The packing 4 of this cap has a substantially disc shape, and a sealing rib 30 is provided upright on the outer peripheral portion thereof. This packing 4 is located inside the weakening lines 20, 20 (first
The entire area of the portion surrounded by the diagonal lines in the drawings, the portion drawn by the thick lines in FIGS. 2 and 4, hereinafter referred to as the adhesive portion) N is firmly adhered to the top plate portion 5. The adhesive force is set to about 2 kg or more so that the packing 4 can be prevented from being pulled inward by the suction force generated when the hot material filled in the bottle cools. The value of this adhesive force is
Is a value measured by peeling in a direction perpendicular to the top plate portion 5.

Further, the packing 4 is not adhered to the top plate portion 5 outside the weakened lines 20, 20. Packing 4 like this
Partial adhesion between the top plate portion 5 and the top plate portion 5 can be performed by printing a layer having good adhesiveness and a layer having poor adhesiveness at predetermined positions on the inner surface of the cap body 2 in advance.

To open the cap thus configured, the pulling ring 3 is pulled upward. Then, as shown in FIG.
The cap body 2 is broken along the weakening lines 20 and 20, and the cut portion 15 is pulled upward. The packing 4 adhered to the cut portion 15 is also pulled upward. The packing 4 pulled up at this time is the weakening line 2
Since the residual pieces 16 and 16 on the outside of 0 and 20 are gradually pushed outward, the skirt of the tubular portion 6 wound from the lower end portion F of the lip portion E of the bottle mouth B to the lower portion thereof is removed from the lip portion E. ,
Finally, the cap is removed from the bottle mouth B.

In this cap, the middle portions 20B, 20B of the weakening lines 20, 20
Is formed along the starting end portion 26 of the curved surface of the shoulder portion 24, so that the horizontally extending portion as in the conventional cap disappears from the inner end portions Z, Z of the residual pieces 16 and 16, The ends Z, Z are inclined upward inward (in this state, the inner ends Z, Z of the residual pieces 16, 16 are also pulled when the cut portion 15 is pulled upward and cut. As it is pulled up, it becomes more noticeable when the stopper is opened).

Therefore, in this cap, the inclination of the inner ends Z, Z of the residual pieces 16, 16 is considerably close to the direction in which the liner 4 adhered to the cut portion 15 is pulled out, and the resistance when pulling out the packing 4 is reduced.

Moreover, in this cap, as described above, the inner ends Z, Z of the residual pieces 16, 16 are inclined in a direction similar to the direction in which the packing 4 is pulled out. The tendency for 16,16 to be pulled upward is alleviated. Therefore, the tail-wound portion of the tubular portion 6 is not pressed against the lower end portion F of the lip portion E of the bottle mouth B when the cap is opened. As a result, at the time of opening the cap, the residual pieces 16 and 16 pushed by the packing 4 are pushed out outward without resistance, and the bottle separation of the cap is improved.

Furthermore, in this cap, the middle part 20B of the weakening line 20 is the shoulder part 2
As a result of being formed along the starting end portion 26 of 4, the shape of the residual pieces 16, 16 remaining in the bottle mouth B at the time of opening becomes a shallow J-shape instead of the deep J-shape as in the conventional example shown in FIG. The rigidity weakens. As a result, the residual pieces 16, 16 are easily deformed by the packing 4 that is pulled up, and the opening force is reduced.

And in this cap, the middle part 20B of the weakening line 20 is the shoulder part 2
As a result of being formed along the starting portion 26 of the curved surface of 4, the weakening line 2
The middle part 20B of 0 is located outside the opening D of the bottle mouth B, and the weakening line 20,2 of the packing 4 having a substantially disk shape is located on the middle part 20B.
Since the entire portion located inside 0 is firmly adhered to the top plate portion 5, even if the suction force generated when the hot material filled in the bottle cools acts on the packing 4, the packing 4
Is not sucked into the bottle. Therefore, this cap exhibits a reliable sealing property even when it is used in a bottle filled with a hot product.

(Example 2) A cap (nominal diameter 38 mm) having the structure described in Example 1 was prototyped and its opening force and hermeticity were examined.

For comparison, the cap shown in the conventional example was also prototyped and the opening force was examined. The difference between the comparative example and the example is that the intermediate portions 10B, 10B of the weakening lines 10, 10 are formed at a position of about 1 mm from the center of the cap, and the packing 4 and the top plate portion 5 are different. There are two points, that is, the bonding is performed only at the position away from the pulling ring 3.

When these caps were attached to a jar filled with 90 ° C. coffee, the packing of the comparative example was pulled out of the sealing surface C by the packing 4 being pulled into the jar mouth B when the coffee cooled. I couldn't close it. On the other hand, in the example, the bottle mouth B could be tightly closed.

Then, the capping ability of the cap attached to the bottle was examined. As a result, the cap opening force of the example was 2.1 kg and that of the comparative example was 4.3 kg.

From this result, it was confirmed that the cap of the present invention can be used to close the bottle filled with the hot product and has an excellent openability.

[Advantage of Invention] As described above, in the cap of this invention, the middle part of the weakening line is along the starting end on the top plate side of the curved surface of the shoulder formed by the top plate part and the tube part, or more than that. The top plate of this cap attached to the bottle mouth is provided close to the part, and the entire part located inside the weakening line of the packing is firmly adhered to the top plate part and the part located outside the weakening line of the packing is attached to the bottle mouth. When pulling up while separating the part along the weakening line, it is not adhered to the inner surface of the cap so that it can be pulled out from the residual piece remaining in the bottle mouth by being pulled by the part located inside the weakening line of the packing. When the stopper is opened, the inner end of the residual piece remaining in the bottle mouth substantially coincides with the direction in which the packing is pulled out, and the resistance when pulling out the packing is reduced. Moreover, the tendency that the residual piece is pulled up by the packing at the time of opening the plug is eliminated, and the tail-wound portion of the tubular portion is not pressed against the lower end of the lip portion of the bottle mouth.

Therefore, the cap of the present invention can be opened with a weak force, and the bottle can be released easily when the cap is opened regardless of how it is opened.

Further, in this cap, the middle part of the weakening line is formed along the starting end part of the curved surface of the shoulder part, and as a result, the middle part of the weakening line is located outside the opening of the sealing surface of the bottle mouth, Since the portion inside the weakening line of the disk-shaped packing is firmly adhered to the top plate, the liquid shrinks in volume as the hot material filled in the bottle cools and the upper part of the bottle Even if the suction force generated in the space acts on the packing, the packing is not sucked into the bottle. So this cap is
Even if it is used in a bottle filled with a hot product, it exhibits a reliable sealing property.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the cap of the present invention,
2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is a side view showing the same embodiment, and FIG. 4 is a partial sectional view showing a state in which the cap of the same embodiment is attached to the bottle mouth. 5 is a perspective view showing a state when the cap of the same embodiment is opened, FIG. 6 is a plan view showing an example of a conventional cap, FIG. 7 is a side view of the same, and FIG. Is a sectional view taken along the line VIII-VIII in FIG. 6, and FIG.
The figure is a perspective view showing a state when the cap is opened. 2 ... Cap body, 3 ... Tensile ring, 4 ... Packing, 5 ... Top plate part, 6 ... Cylindrical part, 20 ... Weakened wire, 20B ...
… Middle part, 24 …… Shoulder part, 26 …… Starting part, N …… Part located inside the weakening line.

Claims (1)

[Scope of utility model registration request] 1. A cap main body in which a tubular part hangs down from a peripheral edge of a disc-shaped top plate part, and a shoulder portion formed by the top plate part and the tubular part is formed into a curved surface, and a lower end edge of the tubular part of the cap main body. And a disk-shaped packing disposed on the inner surface of the top plate portion of the cap body, and the cap body is provided with a disk-shaped packing from a position near a side edge of the tension ring. A cap formed with a pair of weakening lines rising up to the opposite position from the tubular portion, wherein the middle portion of the weakening lines is the start end of the curved surface of the shoulder portion formed by the top plate portion and the tubular portion on the side of the top plate portion. Along the portion or closer to the tubular portion than that, the entire portion located inside the weakening line of the packing is firmly bonded to the top plate portion,
Also, when the portion located outside the weakening line of the packing is pulled up while separating the top plate part of the cap attached to the bottle mouth along the weakening line, pulling to the portion located inside the weakening line of the packing. A cap characterized in that it is not adhered to the inner surface of the cap so that it can be extracted from the residual pieces that remain in the bottle mouth.