JPH0233589B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a container lid equipped with a sealing member having a packing layer and a sealing layer that are laminated and bonded.

[Prior art and its drawbacks]

As a container lid for sealing the mouth of a container for powdered instant coffee or milk, a container lid consisting of a combination of a container lid shell and a sealing member disposed within the shell is preferably used. ing. The sealing member is composed of a packing layer and a sealing layer that are laminated and bonded to each other.

When sealing a container mouth with such a container lid, a suitable adhesive is generally applied to the end face of the container mouth, so that when the container lid is attached to the container mouth as desired, A portion of the surface of the sealing layer of the sealing member that comes into contact with the end surface of the container mouth is adhered to the end surface of the container mouth. When opening the container mouth, first, the container lid shell is manually operated to separate from the container mouth. In this way, the sealing member disposed within the container lid shell is prevented from moving together with the container lid shell due to mechanical locking or the like with the container lid shell. However, the sealing layer of the sealing member is adhered to the end surface of the container mouth.
Therefore, in normal cases, the packing layer and the sealing layer in the sealing member are separated, and the packing layer is thus removed from the container mouth together with the container lid shell, but the sealing layer remains adhered to the end surface of the container mouth. left behind. The sealing layer itself is then manually picked and separated from the end face of the container opening, thus opening the container opening.

It has been found that the conventional container lid of the form described above has the following serious problems or drawbacks that must be solved. That is, in conventional container lids, especially when the container lid shell has an inner protrusion such as a lug that engages relatively firmly with the periphery of the sealing layer surface of the sealing member, it is difficult to open the container opening. When the container lid shell is removed from the container mouth, the packing layer and the sealing layer of the sealing member are not easily separated, and therefore, (a) the container lid shell and the packing layer of the sealing member are not easily separated from the container mouth. (b) Instead of separating the packing layer and sealing layer in the sealing member, which is extremely difficult, the sealing layer and the end face of the container opening are separated, and not only the packing layer but also the sealing layer in the sealing member are separated. or (c) the seal member is detached from the container opening due to the container lid shell (in such a case, the consumer may assume that the container opening had already been tampered with before purchase); Both the packing layer and the sealing layer and the sealing layer and the end face of the container mouth are not completely separated, resulting in unacceptable situations such as irregular breakage of the sealing layer. There were many things that happened.

[Purpose of the invention]

The present invention has been made in view of the above facts, and its main purpose is to provide an excellent container lid that solves the above-mentioned problems and drawbacks of conventional container lids.

[Summary of the invention]

According to the present invention, the shell includes a top surface and a skirt that hangs down from the periphery of the top surface, and a seal member disposed within the shell, and the seal members are mutually separated so that they can be separated with a relatively weak force. In a container lid having a packing layer and a sealing layer that are laminated and bonded, the sealing layer has a break line located at substantially the same position as the outer edge of the end surface of the container mouth to be sealed or at a position outside thereof. an inner region of the seal layer inside the break line is bonded to an end surface of the container mouth, and an outer region of the seal layer outside the break line has a protrusion projecting inward of the skirt. A container lid is provided, characterized in that the container lid is latched to the container lid.

[Specific examples of the invention]

Hereinafter, a specific example of a container lid constructed according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 3, the illustrated container lid is composed of a container lid shell 10 and a sealing member 2 disposed within this shell 10. As shown in FIG. The shell 10 may have an appropriate shape depending on the shape of the mouth of the container to be sealed, and in the illustrated example has a circular top surface 12 and a cylindrical skirt 14 depending from the periphery of the circular top surface 12. The lower end of the cylindrical skirt 14 has a plurality of (generally three to six) threaded protrusions that are engaged with a plurality of threaded protrusions (generally three to six threads) formed on the outer circumferential surface of the container opening, as will be described later. (pieces to 6 pieces)
lugs 16 (i.e., protrusions projecting radially inward) are formed at intervals in the circumferential direction. Such a lug 16 has the essential function of locking the container lid shell 10 to the container mouth as desired, as will be described later, and also prevents the sealing member 2 disposed within the container lid shell 10 from being removed from the container lid shell 10. It also has the effect of preventing detachment. Such container lid shell 10
can be made from a suitable metal material such as a tinplate plate, a chromic acid treated steel plate or an aluminum base alloy plate, or a suitable synthetic resin material such as polyethylene or polypropylene.

Next, the sealing member 2 will be explained with reference to FIGS. 1 and 2 as well as FIG. 3. The illustrated sealing member 2 is composed of a packing layer 4 and a sealing layer 6. In the case of , the shape is circular, but it can be made into any suitable shape depending on the shape of the container opening to be sealed or the shape of the container lid shell. The packing layer 4 in the sealing member 2 is preferably formed of a single layer of elastic and flexible cardboard or synthetic resin material, or a laminate thereof. On the other hand, the seal layer 6 is
It is preferably formed from a single layer of paraffin paper, metal foil, synthetic resin film, etc., or a laminate thereof, which has excellent gas and fluid impermeability. The packing layer 4 and the sealing layer 6 of the sealing member 2 are laminated on each other as shown in FIG. They are joined together so that they can be separated with a weak force. A break line 8 is formed in the sealing layer 6 of the sealing member 2, which is located at substantially the same position as the outer edge of the end surface of the container opening to be sealed, which will be described later, or at a position outside of it. In the illustrated example, the sealing layer 6 is formed with an annular breaking line 8 having a diameter somewhat larger than the diameter of the outer edge of the end surface of the container mouth to be sealed, which will be described later. This breaking line 8 is a so-called perforation line, which is a continuous notch made in the seal layer 6 as in the illustrated example, or a plurality of notches made in the seal layer 6 at appropriate intervals. Eye-shaped ones are fine. Furthermore, the depth of the cut to form the fracture line 8 may be set over the entire thickness of the seal layer 6 as shown in FIG. may be set. Moreover, there is no particular problem even if the notches are formed over a part of the thickness of the packing layer 4 as well as the entire thickness of the sealing layer 6.

The seal member 2 described above is preferably placed within the container lid shell 10 before the lugs 16 are formed, but if desired, the seal member 2 may be forced elastically deformed into the container lid shell 10 after the lugs 16 are formed. It can also be inserted and thus placed within the container lid shell 10.

Next, with reference to FIG. 3 and FIG. 4, a method for sealing the container opening 18 by attaching the above-mentioned container lid to the container opening 18 (FIG. 4) will be described.

When attaching a container lid to the container opening 18, first apply an appropriate adhesive to the end surface 20 of the container opening 18, then fit the container lid onto the container opening 18, and attach the container lid shell. 10 is rotated clockwise when viewed from above in FIG. In this way, the lug 16 formed on the container lid shell 10 is engaged with the threaded protrusion 22 formed on the outer circumferential surface of the container opening 18, and the container lid shell 10 is attached to the container opening 18 as required. It is worn on the street. On the other hand, when the container lid shell 10 is attached to the container opening 18 as required, the sealing member 2 is pressed against the end surface of the container opening 18 by the force applied from the top surface of the container lid shell 10. The container opening 18 is reliably sealed, and the sealing layer 6 of the sealing member 2 is adhered to the end surface of the container opening 18 by the action of the adhesive applied to the end surface 20 of the container opening 18.

When opening the container opening 18 sealed as described above, first put your finger on the container lid shell 10 and rotate the container lid shell 10 counterclockwise when viewed from above in FIG. urge In this way, the lug 16 formed on the container lid shell 10
The engagement with the threaded projection 22 formed on the container opening 18 is released, and the container lid shell 10 is separated upward from the container opening 18. At this time, until the container lid shell 10 is raised to the position shown in FIG. 20 remains unchanged. However, when the container lid shell 10 is further raised from the position shown in FIG. A force is applied in the direction, and the sealing layer 6 is lifted upward by the force. On the other hand, in a region inside the break line 8 of the seal layer 6, the seal layer 6 is adhered to the end surface 20 of the container opening 18. As described above, the sealing layer 6 has an outer area 6a (FIG. 2) and an inner area 6b of the break line 8.
(FIG. 2), and further, in the inner region 6b of the sealing layer 6, the packing layer 4 and the sealing layer 6 of the sealing member 2 are separated, and thus the packing layer 4 and the sealing layer 6 of the sealing member 6 are separated.
As the container lid shell 10 rises, the outer region 6a is raised and separated from the container opening 18. On the other hand, the inner region 6b of the seal layer 6 is
It is held on the container mouth 18 by adhesion between the sealing layer 6 and the end surface 20 of the container mouth 18, and is held as it is on the end surface 20 of the container mouth 18, as shown in FIG.

After the container lid shell 10, the packing layer 4 of the sealing member 2, and the outer region 6a of the sealing layer 6 are separated from the container opening 18 in the manner described above, they are held on the end surface 20 of the container opening 18. The end of the inner region 6a of the sealing layer 6 is pinched with fingers and raised to separate it at least partially from the end surface 20 of the container opening 18, thus opening the container opening 18.

In this detached state of the container lid shell 10, the packing layer 4 of the sealing member 2 and the outer region 6a of the sealing layer 6 are retained within the shell 10. Then, when the container lid shell 10 is attached to the container mouth portion 18 as required in order to reseal the container mouth portion 18, the packing layer 4 of the sealing member 2 held within the container lid shell 10 (in detail,
When the inner region 6b of the seal layer 6 remains on the end surface 20 of the container opening 18 (the part exposed to the outside by removing the inner region 6b of the seal layer 6), the inner region 6b of the seal layer 6 is removed. Area 6
b), and thus the container opening 18 is reliably sealed by the packing layer 4 of the sealing member 2.

The sealing layer 6 of the sealing member 2 is similar to a conventional container lid.
If the break line 8 is not formed in the container lid shell 10, as will be easily understood by referring to FIG.
The upward force applied to the sealing member 2 from the sealing member 6 causes the entire sealing member 2, that is, the packing layer 4 and the sealing layer 6 to rise together. Therefore, it is not easy to separate the packing layer 4 and the sealing layer 6, (a) it is extremely difficult to remove the packing layer 4 of the container lid shell 10 and the sealing member 2 from the container opening 18, and (b) the sealing layer 2 The packing layer 4 and the sealing layer 6 are not separated and the end surface 2 of the container opening 18
0, and not only the packing layer 4 of the sealing member 2 but also the sealing layer 6 are separated from the container opening 18 along with the container lid shell 10, or (c) Both the packing layer 4 and the sealing layer 2 and the sealing layer 6 and the end surface 20 of the container mouth 18 are not completely separated, and the sealing layer 6 is mainly adhered to the end surface 20 of the container mouth 18. The irregularly torn part of the sealing layer 6 is detached from the container opening 18 together with the container lid shell 10 and the packing layer 4 of the sealing member 2, and the remaining part is separated from the container opening 18. There is a tendency for unacceptable situations such as residue to remain in the container opening 18 to occur.

On the other hand, when the break line 8 is formed in the sealing layer 6 of the sealing member 2 as in the container lid according to the present invention, the break line is located at the outer edge of the end surface 20 of the container opening 18 or on the outside thereof. 8, the sealing layer 6 is reliably divided into an outer region 6a and an inner region 6b. Therefore, the packing layer 4 and the sealing layer 6 are easily separated in the inner region 6b of the sealing layer 6, and the outer region 6a of the packing layer 4 and the sealing layer 6 of the container lid shell 10 and the sealing member 2 is separated.
is easily separated from the container mouth 18, while the inner region 6b of the sealing layer 6 is securely held in the desired shape defined by the break line 8 by adhesion to the end surface 20 of the container mouth 18. , the occurrence of the above-mentioned situation that may occur if the break line 8 is not formed is reliably avoided.

Furthermore, in the container lid constructed according to the present invention in which the breaking line 8 is formed in the sealing layer 6 of the sealing member 2, the adhesive force between the sealing layer 6 and the end surface 20 of the container opening 18 is reduced to a certain extent. Even if you don't make it strong,
In the inner region 6b of the sealing layer 6, the packing layer 4 and the sealing layer 6 are reliably separated, and the sealing layer 6
The inner region 6b of the container has a desired shape and is securely attached to the container opening 1.
Since the sealing layer 6 is adhesively held on the end surface 20 of the
and the end surface 20 of the container opening 18, and when separating the inner region 6b of the sealing layer 6 adhesively held therefrom from the end surface 20 of the container opening 18, The entire inner region 6b of the sealing layer 6 can be easily and completely attached to the end surface 20 of the container opening 18.
It is also possible to obtain the advantage that it can be separated from the

On the other hand, if the break line 8 is not formed in the sealing layer 6 of the sealing member 2, even if the container lid shell 10 is removed from the container opening 18, the entire sealing layer 6 of the sealing member 2 In order for the sealing layer 6 to be retained on the container opening 18, the adhesive force between the sealing layer 6 and the end surface 20 of the container opening 18 must be made considerably strong. It is extremely difficult, if not impossible, to completely separate the entire sealing layer 6 from the end surface 20 of the container opening 18, and the sealing layer 6 is separated from the end surface 20 of the container opening 18. In many cases, unfavorable sanitary situations occur in which adhesive remains locally.

FIG. 7 illustrates a sealing member 2 in a second embodiment of a container lid constructed according to the invention, in which a break line 8 formed in the sealing layer 6 of the sealing member 2 has been modified. ing. In the specific example shown in FIG. 7, the break line 8 formed in the sealing layer 6 of the sealing member 2 is similar to the break line 8 in the first specific example described above. It has a substantially annular portion 8a extending along the outer edge of the end surface 20 (see FIG. 4), and an interrupted portion 24 is present in the portion 8a. A portion 8b that extends radially outward to the outer edge of the seal layer 6 following the portion 8a is formed at each of both ends of the interrupted portion 24.

When the sealing member 2 in which the break line 8 is formed as shown in FIG. 7 is used, the container lid attached to the container opening 18 (see FIG. 4) is removed and the container opening In order to open the part 18, the container lid shell 10 (see FIGS. 3 and 4) is removed.
together with the packing layer 4 of the sealing member 2 (Fig. 1,
3 and 4) and the outer region 6a of the sealing layer 6 is removed from the container opening 18, the end surface 20 of the container opening 18 has a shape as shown in FIGS. 8 and 9. The inner region 6 of the sealing layer 6 is
b is left behind. In the inner region 6b of the sealing layer 6 illustrated in FIGS. 8 and 9, there is a radially outwardly projecting projection 26 defined between said portions 8b of the break line 8. The existence of such a protrusion 26 requires that when separating the inner region 6b of the seal layer 6 from the end surface 20 of the container opening 18, the inner region 6b of the seal layer 6 can be easily removed by pinching the protrusion 26. The region 6b can be gripped with the fingers and the separation of the inner region 6b of the sealing layer 6 from the end face 20 of the container mouth 18 can therefore be accomplished even more easily.

In the specific example shown in FIG. 7, one interruption 24 is provided in the portion 8a of the break line 8, and a pair of portions 8a are formed in relation to this interruption 24, but if desired, the A plurality of interruptions 24 are provided in the portion 8a at a plurality of spaced locations and a pair of portions 8b are formed for each such interruption 24, thus forming a seal that remains on the end surface 20 of the container mouth 18. It is also possible for the inner region 6b of the layer 6 to have a plurality of protrusions 26 spaced apart in the circumferential direction.

Although specific examples of the container lid configured according to the present invention have been described above in detail with reference to the accompanying drawings, the present invention is not limited to such specific examples, and there may be no deviation from the scope of the present invention. Needless to say, various modifications and modifications are possible.

Furthermore, in the above description, the present invention is applied to a so-called lug-type container lid shell 10 in which a plurality of lugs 16 are formed at the lower end of the skirt 14.
The present invention can be applied not only to the so-called lug type container lid shell 10 but also to various container lids such as the so-called screw type container lid shell in which a thread is formed on the skirt.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a sealing member in a specific example of a container lid constructed according to the present invention. Second
The figure is a bottom view of the sealing member shown in FIG. 1. FIG. 3 is a side view showing a part of the first specific example of the container lid according to the present invention in cross section. FIG. 4 is a side view, partially in cross section, of the container lid shown in FIG. 3 adhered to the container mouth. FIG. 5 is a side view, partially in cross section, of a state in which the container lid shell has been raised by a predetermined amount from the state shown in FIG. 4; FIG. 6 is a side view showing, in cross section, a part of the inner region of the sealing layer remaining in the container mouth after the container lid shell is further raised from the state shown in FIG. 5 and separated from the container mouth. figure. FIG. 7 is a bottom view showing a sealing member in a second embodiment of a container lid constructed in accordance with the present invention. FIGS. 8 and 9 show the inside of the seal layer remaining on the container mouth after the container lid shell is removed from the container mouth when the sealing member shown in FIG. 7 is used, respectively. The side view and the slope view which show a part of area|region in cross section. 2... Sealing member, 4... Packing layer, 6...
... Seal layer, 8 ... Fracture line, 10 ... Container lid shell, 18 ... Container mouth, 20 ... End face of container mouth.

Claims (1)

[Claims] 1. Consists of a shell having a top surface and a skirt hanging from the periphery of the top surface, and a sealing member disposed within the shell, and the sealing members are mutually attached so that they can be separated with a relatively weak force. In a container lid having a packing layer and a sealing layer laminated and bonded to each other, the sealing layer has a break line located at a position substantially at the same position as the outer edge of the end surface of the container opening to be sealed or at a position outside it. an inner region of the seal layer that is inside the break line is bonded to an end surface of the container mouth, and an outer region of the seal layer that is outside the break line projects to the inside of the skirt. A container lid, characterized in that it is locked to a protrusion. 2. The container lid according to claim 1, wherein the breaking line has an annular shape extending along the outer edge of the end surface of the container mouth. 3. The rupture line extends along the outer edge of the end surface of the container mouth and includes at least one interrupted portion, and at least a pair of portions extending from each side edge of the interrupted portion to the outer edge of the sealing layer. A container lid according to claim 1, wherein: 4. The container lid according to any one of claims 1 to 3, wherein the breaking line is formed by a continuous cut cut in the sealing layer. 5. The container lid according to any one of claims 1 to 3, wherein the break line is formed by a plurality of notches cut in the seal layer at intervals. 6. A container lid according to claim 4 or 5, wherein the incision extends over the entire thickness of the sealing layer.