JPS58203849A - Vessel cover made of synthetic resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin container lid, and more particularly to a synthetic resin M container lid having a top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall.

As is well known to those skilled in the art, container lids for sealing the mouth and neck of containers such as food and beverage bottles have recently been constructed using a top surface and a cylindrical skirt wall that hangs down from the periphery of the top wall. Synthetic resin container lids have come to be widely put into practical use.

However, conventional synthetic resin container lids have the following disadvantages due to the fact that the top wall and the cylindrical skirt wall that hangs down from the periphery of the top wall are integrally molded. Ta.

(b) In a type of container lid having so-called pilfer-proof property (property to prevent unauthorized use such as refilling of contents), for example, as disclosed in JP-A-56-74445, the skirt wall has a An extending weakened line is formed, and the skirt is divided into a main portion located above the weakened line and a pilfer-proof hem located below the weakened line. A female thread is formed on the inner surface of the main part of the skirt wall to be screwed into a male thread formed on the outer peripheral surface of the mouth and neck of the container, and a female thread is formed on the inner surface of the pilfer-proof hem of the skirt wall. , a flap of at least 11 m (usually a plurality of flaps spaced circumferentially) projecting radially inward and engaging the lower surface of a locking flange formed on the outer circumferential surface of the neck and neck of the container; Advantageously, it is formed in pieces.

However, in conventional synthetic resin container lids, it is extremely difficult, if not impossible, to mold the flap pieces into a desired multiple shape due to the need to cut out the mold after molding69. Furthermore, because the mold-cutting operation after molding is complicated, container lids cannot be molded at a sufficiently high speed.

(b) The inner surface of the top wall is generally provided with an annular seal that is brought into close contact with the mouth edge of the container. This annular seal is placed in such a way that it is brought into close contact with the neck edge of the container in a sufficiently good manner. It is desirable for Hiei fishing to be flexible. on the other hand,
It is desirable that at least the lower portion of the skirt wall be relatively rigid so that it is not easily deformed. It is therefore desirable that the annular seal be molded from a relatively soft synthetic resin material and that at least the lower portion of the skirt wall be molded from a relatively hard synthetic resin material. However, in order to satisfy the above request, KI/i molded the container lid body, which has a top wall and a cylindrical skirt wall hanging from the periphery of the top wall, in the conventional synthetic resin container lid. After that, a separately molded annular seal is inserted and attached to the inner surface of the top wall, or a separate annular seal is directly attached to the desired position on the inner surface of the top wall. ``EIK molding was necessary, but the method of installing such an annular seal is relatively complicated, and it is also impossible to adhere the annular seal to the inner surface of the top wall as desired. Even if it is not possible, it can be determined with some difficulty (c) For example, as disclosed in Japanese Patent Publication No. 56-30266, if the contents contained in the container are carbonated drinks or the like and there is considerable pressure inside the container. If this occurs, a ventilation hole is provided in the upper part of the skirt wall, more specifically in the part above the part where the female thread is formed on the inner surface, to prevent the container lid from flying off when the container is opened. It is desirable to form a However, in conventional synthetic resin #container lids, it is not necessarily easy to form the above-mentioned ventilation holes in the required number of times in terms of mold cutting and the like.

The present invention has been made in view of the above facts, and its main purpose is to provide a new and excellent synthetic resin container lid that solves the above-mentioned nine disadvantages that exist in conventional synthetic resin container lids. It is to provide.

As a result of extensive studies, the present inventor broke away from conventional preconceived notions and formed separately a first member that defines at least the top wall and a second member that defines at least the lower part of the skirt wall, According to the synthetic resin container lid with the unique grooved bottom formed by at least partially joining the first member and the second member to each other, the lid of the synthetic resin container is different from that of conventional synthetic resin container lids. It has been found that the above-mentioned disadvantages of loops can be skillfully solved.

That is, according to the present invention, in a synthetic resin container lid having a top wall and a cylindrical skirt wall hanging from the periphery of the top wall, at least the first member defining the top wall, and at least the skirt A composition characterized in that it is formed by separately molding the members lK2 defining the lower part of the first member and the first member and the second member at least partially joining each other. A resin container lid is provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a concrete example of a synthetic resin container lid constructed in accordance with the present invention will be described in more detail with reference to the accompanying drawings.

Referring to FIGS. 1 and 2 illustrating a first specific example of a synthetic resin container lid constructed in accordance with the present invention, the container lid, generally designated by the number 2, includes a first member. 4 and the second member 6 are mutually joined. The first member 4 and the second member 6 can be separately molded from appropriate synthetic resin materials by injection molding or pressure molding.

The first member 41d has a substantially disk shape as a whole and defines the top wall 8 of the container lid 2. As shown in FIG. 2, an annular seal 10 is integrally formed on the lower surface of the first member 4, and hence on the inner surface of the top cover 8, to be brought into close contact with the edge of the mouth and neck of the container, as will be described later. is preferable. It is desirable that the annular seal lO be relatively flexible so that it can be brought into close contact with the neck edge of the container sufficiently to seal it sufficiently, and therefore, as shown in the first
When the annular seal 10 is integrally formed on the lower surface of the member 4, the first member 4 is molded from a relatively soft synthetic resin such as polyvinyl chloride, ethylene vinyl acetate, or soft polyethylene. is preferable.

On the other hand, the second member 6 has a substantially cylindrical shape as a whole,
The entire cylindrical skirt wall 12 of the container lid 2 is defined. The above-mentioned first member 4 is attached to the inner circumference of the upper end of the second member 6.
An annular shoulder 13 is formed for receiving the outer periphery of. In addition, a weakened line 14 extending in the circumferential direction is formed in the member 6 of w, 2, and thus the skirt wall 12, and the skirt wall 12 is also weakened with the thread forming portion 16 located above. The line 14) is also divided into a pilfer-proof hem 18 located below. The illustrated weakening line 14 includes a plurality of circumferentially spaced slots 20 and the slots 20.
The pilfer-proof hem portion 18 is integrally connected to the thread forming portion 16 by the bridging portion 22 which is relatively soft and thin and located between 0 and 0. A female thread 24 is formed on the inner surface of the thread forming portion 16, which is screwed into a thread formed on the outer peripheral surface of the mouth and neck of the container, as will be described later. Furthermore, a knurling or uneven shape 26 is formed on the outer surface of the thread forming portion 16 to prevent fingers from slipping when gripping the container lid 2 with fingers.

On the other hand, the inner surface of the pilfer-proof hem 18 has at least 1 lli flap piece 28 projecting radially inward.
il, preferably a plurality of them are formed at intervals in the circumferential direction. The illustrated flap piece 28 projects axially upwardly and radially inwardly from the inner surface of the pilfer-proof hem 18 .

However, as disclosed in FIG. 5 of the above-mentioned Japanese Patent Application Laid-open No. 56-74445, for example, when the container lid 2 is attached to the mouth and neck of the container, the radius is Other suitable forms of flap pieces, such as those that project inwardly, may also be formed on the inner surface of the pilfer-proof hem 18. Skirt wall of Book M2 10. In particular, it is desirable that the portion where the female thread 24 is formed and the lower portion thereof be relatively rigid, and therefore the second
The member 6 is preferably molded from a relatively hard synthetic resin such as polypropylene or hard polyethylene.

As can be easily understood by referring to FIG.
To complete the container lid 2, the first member 4 is inserted into the annular shoulder 13 formed on the inner periphery of the upper end of the second member 6, thus connecting the first member 4 and the second member. The members 6 are positioned in the required direction with respect to each other. And the second member 6
The annular shoulder 13 and the outer periphery of the first member 4 located there are joined to each other over the entire circumferential direction or at a plurality of positions spaced apart in the circumferential direction. The conventional container lid 2 shown in the figure is completed. Mutual bonding of the second member 6 and the first member 4 can also be achieved by bonding them together using a suitable adhesive, but this may be achieved in terms of mutual bonding strength and speeding up of the bonding operation. From this perspective, it is preferable to heat and melt the bonding region of the two by ultrasonic heating or high-frequency dielectric heating, which is well known per se, and thus fuse the two.

In the first embodiment of the synthetic wood container lid constructed according to the present invention described above, the following points should be particularly noted. First, the second member 6Fi has a substantially cylindrical shape with openings not only on its lower surface but also on its upper surface. Therefore, when injection molding or pressure molding the second member 6, the inner shape of the second member 6 can be defined by the molds that are divided in the vertical direction, so that the inner shape of the second member 6 can be mutually divided during mold cutting. Eliminates the need to use an entire highly complex mold with a large number of parts that can be moved, and also eliminates complicated mold-cutting operations, such as separating the mold and the molded product by rotating them relative to each other during mold-cutting. It is possible to form a flap piece 28 of a desired regular shape on the inner surface of the pilfer-proof hem 18 of the second member 6 without the need for a pilfer-proof hem 18. Second, first
Since the member 4 and the second member 6 are molded separately, the top wall 8 on which the annular seal 10 is integrally molded is molded from a comparatively soft synthetic resin, and the skirt wall 1
2 is molded from a rigid synthetic resin, and thus each part of the container lid 2 can be made to have desirable characteristics.

The conventional container lid 2 shown in FIG. 2 is commonly used for containers having a neck portion as generally indicated by the numeral 30 in FIG.

The entire mouth part 30q has a substantially cylindrical shape, and on its outer surface there is a male thread 32 corresponding to the female thread 24 formed on the container lid 2, and a male thread 32 located below the male thread 32. An annular locking flange 34 is formed.

In order to attach the container lid 2 to the mouth and neck part 30 of the container and seal the mouth and neck part 30, the container lid 2 is fitted onto the mouth and neck part 30, and the container lid 2 is moved in the closing direction.
That is, in FIG. 3, it is rotated clockwise when viewed from above. In this way, the female thread 24 formed on the container lid 2
is screwed into a male thread 32 formed in the mouth and neck part 30,
As a result, the container lid 2 is moved downward in the axial direction as it rotates. When the container lid 2 is moved downward in the axial direction, the flap piece 28 formed on the container lid 2
It passes through the male thread 32 formed in the mouth and neck part 30, and further passes through the annular locking 7 flange 34,
When passing through the annular locking flange 34, the flap piece 28 is elastically bent radially outward under the action of the annular locking flange 34.

Connect the female thread 24 of the container lid 2 to the neck part 30'! When the container M2 is fully screwed into the S thread 32 and the container M2 is fully attached to the neck portion 30 as shown in FIG.
No longer affected by the effects of step 4, it elastically returns to its original state. Thus, the upper edge of the flap piece 28 forms an annular locking flange 34.
It is latched to the bottom surface of. On the other hand, the annular seal 10rfi disposed on the lower surface of the top lid 8 is pressed against the edge of the mouth portion 30 to bring it into close contact, and is crimped to sufficiently seal the mouth and neck portion 3°.

The container lid 2 attached to the mouth part 30 with the above-mentioned undersize,
When detaching from the mouth and neck part 30 and opening the mouth and neck part 28, the container lid 2 is rotated in a direction opposite to the direction of rotation during loading, that is, in a counterclockwise direction when viewed from above in FIG. Then, a container! Since the female thread 24 formed at -2 is moved along the male thread 32 formed at the mouth and neck 3°, the container lid 2td is not moved upwardly. However, the flap piece 2 formed on the inner surface of the pilfer-proof hem 18 of the container lid 2
Since the upper edge of 8 is locked to the lower surface of the annular locking flange 34 formed on the neck 30, upward movement of the container lid 2 in the axial direction is prevented, and thus the skirt wall 12 of the container lid 2 is prevented from moving upward in the axial direction. Considerable stress acts on the weakened line 14 formed in the container lid 2, and more specifically, on the bridge portion 22 thereof, the weakened line 14 (its bridge portion 22) is broken, and the container lid 2
is divided into two parts: the pilfer-proof hem 18 and the other parts. After that, the portion of the container lid 2 other than the pilfer-proof hem 18 can be easily moved upward in the axial direction, and therefore moves upward in the axial direction in accordance with the rotation of the container lid 2, and the portion of the container lid 2 other than the pilfer-proof hem 18 can be moved upward in the axial direction, and the portion of the container lid 2 can be moved upward in the axial direction. 30, and the mouth and neck 30 are opened by sniffing. On the other hand, the bilfer groove hem 18 does not detach from the mouth and neck region 30 and remains there.

Next, a second specific example of a synthetic resin container lid constructed according to the present invention will be described with reference to FIG. M4 and FIG. The container lid, designated as a whole by the number 102, is a first member 1
It is formed by joining members 106 of 04 and W12 to each other.

The first member 104 and the second member 106 are each separately
It can be molded from an appropriate synthetic resin material by injection molding or pressure molding.

The first member 104ri includes a generally disc-shaped upper bottle that defines the top wall 108 of the container lid 102, and a hanging member that hangs down from the periphery of this upper wall and defines the upper part of the skirt wall 112 of the container lid 102. have The lower end edge of the hanging wall of the gi member 104 is made into a sawtooth shape, and each of its protruding peaks is formed with a rectangular convex part 105, and each of its depressed valley parts is formed with a rectangular concave part 107. is formed. An a-let or uneven shape 126 is formed on the outer surface of the hanging wall to prevent fingers from slipping when gripping the container lid 102. As shown in FIG. 5, it is preferable that an annular seal 110 is integrally formed on the lower surface of the upper surface of the first member 104, that is, on the inner surface of the top wall 108. As previously mentioned, the annular seal 110 is desirably flexible so that it can be fitted optically closely against the neck edge of the container to provide a sufficient seal; If the annular seal 110 is integrally formed on the lower surface of the upper wall of the first member 104 as shown in the figure, the first member 104ri may be made of relatively soft material such as polyvinyl chloride, ethylene vinyl acetate, or soft polyethylene. Preferably, it is molded from synthetic resin.

On the other hand, the second member 106 has a substantially conical shape as a whole and defines the lower part of the skirt wall 112 of the container lid 102 . The upper edge of this second member 106 is formed into a sawtooth shape corresponding to the sawtooth shape of the lower edge of the hanging wall of the first member 104, and each of its protruding peaks has a rectangular shape. A convex portion 115 is formed, and a rectangular concave portion 117 is formed in each of the recessed valley portions. In addition, the second member 1
06, therefore, a weakened line 114 extending in the circumferential direction is formed in the lower part of the skirt wall 112, and the weakened line 114 is formed in the lower part of the skirt wall 112.
The lower part of 12 is divided into a thread forming part 116 located above the weakened line 114 and a pilfer-proof hem 118 located below the weakened line 114.

The weakened line 114 in the second specific example also includes a plurality of slots) 120 located at intervals in the circumferential direction and a dispersively thin bridge portion 122 located between the slots) 120.
The pilfer-proof hem portion 118 is integrally connected to the thread forming portion 116 by a bridging portion 122. A female thread 124 is formed on the inner surface of the thread forming portion 116.
is formed. On the other hand, the pilfer-proof hem 11
8 has a flap piece 28 in the wll specific example.
At least one flap piece 128 similar to the above is formed, and preferably a plurality of flap pieces 128 are formed at intervals in the circumferential direction. Container lid 102 defined by second member 106
It is desirable that the lower portion of the skirt wall 112 be relatively rigid, and therefore the second member 106 is preferably molded from a relatively rigid synthetic resin, such as polypropylene or rigid polyethylene.

As can be easily understood by referring to FIG.
To complete the container lid 102, the # tooth shape on the lower edge of the depending wall of the first member 104 and the serration shape on the upper edge of the second member 106 are combined with each other. More specifically, the convex portion 105 formed in the sawtooth-shaped protruding ridge portion at the lower end edge of the hanging hawk of the first member 104 is formed in the sawtooth-shaped recessed valley portion at the upper end edge of the second member 106. The second member 104 is inserted into the recess 117 which is inserted into the recess 117 to hold them together, and the recess 107 formed in the sawtooth-shaped recessed valley at the lower end edge of the hanging tank of the first member 104 is inserted into the recess 117 of the second member 104. The convex portion 115 formed on the sawtooth-shaped protruding ridge portion on the upper edge of the cylindrical portion 106 is received, and the two are engaged with each other. Thus, the first member 104 and the member 106 of WIJ2 are positioned in the desired combination with respect to each other.

Then, the convex portion 105 of the first member 104 and the second member 1
06 are joined to each other, and the recess 107 of the first member 104 and the convex portion 11 of the second member 106 are joined to each other.
5 are joined to each other, thus forming the through hole 9 shown in FIG.
The container lid 102 is completed. Convex portion 105 and concave portion 117
It is preferable that the mutual bonding between the concave portion 107 and the convex portion 115 be heated and melted by heating using well-known ultrasonic waves or high-frequency dielectric, thereby fusing the two. If desired, the convex portion 105 and the concave portion 11
7, the concave portion 107 and the convex portion 115 can also be at least partially overlapped in the radial direction and fused to each other.

Then, I! In the second specific example shown in FIG. 4 and FIG. In addition, the length in the axial direction of the convex portion 115 of the second member 106 is larger than that of the first member 106.
4, and when the first member 104 and the second member 106 are combined in the desired combination, the length of the convex part 105 and the concave part 117 is slightly larger. In the region between the retaining portion, the convex portion 115, and the engaging portion of the recess 107, the first member 104 and the second member 1
Therefore, a slight gap is created between the first member 104 and the second part 10.
6 and the engaging portion between the convex portion 405 and the concave portion 117 and the convex portion 115
and the container lid 102 are joined together at the engaging portion of the recess 107.
When completed, the vent hole 1 is placed in the joint area between the first member 104 and the second member 106, that is, the joint area between the convex part 105 and the concave part 8117, and the joint part between the convex part 115 and the concave part 107.
19 is inevitably generated. As mentioned later, the vent hole 119 is connected to the container lid 10 attached to the mouth of the container.
The relatively large pressure present within the container ensures that the container IE 102 does not accidentally fly off and cause injury to the consumer when the container IE 102 is removed from the mouth and neck.

In the second specific example of the synthetic resin container lid constructed according to the above-described general invention, in addition to the first and second points already mentioned in the first specific example, the following points are further provided. should be noted.

That is, when the first member 104 and the second member 106 are combined in the required number of times and joined to each other in a predetermined joining area, and thus the container lid 102 is completed, the container lid "0"
A ventilation hole 119 for preventing the container lid 102 from flying off is necessarily created at a predetermined position of the container lid 102, more specifically, between the joining area of the first member 104 and the second member 106. Therefore, the desired number of ventilation holes 119 can be formed without complicating the mold 119 or complicating the mold-cutting operation.
can be produced on the completed container lid 102.

The container lid 102 as shown in FIG. 5 also has a general neck portion, which is generally indicated by the numeral 130 in FIG. 6, similar to the neck portion 30 shown in FIG. In addition, it is applied to a container having a mouth portion in which a male thread 132 and an annular locking flange 134 located below the male thread 132 are formed on the outer circumferential surface. Since the container lid 102 is equipped with a ventilation hole 119 to prevent the container lid 102 from flying off, considerable pressure is generated inside the container when the contents stored in the container are carbonated drinks or the like. Particularly suitable for cases where:

The container lid 102 is attached to the mouth and neck part 130 of the container, and the mouth and neck part 3 is attached.
In sealing the container lid 2, operations similar to those described for the container lid 2 with reference to FIG.
The container lid 102 is attached to the mouth and neck 130 through the channel 9 shown in the figure. In the state shown in FIG. 6, the upper edge of the flap piece 128 is engaged with the lower surface of the annular locking flange 1340, while the annular seal 110 is pressed against the edge of the mouth and neck portion 130 and brought into close contact therewith. , oral part 130
Seal thoroughly.

The container lid 102 attached to the mouth and neck part 130 is attached to the mouth and neck part 130.
Also when opening the oral 1130 from the female relative, the third
Operations similar to those described for the container lid 2 with reference to the figures are carried out. During such an unsealing operation, the weakened line 114 is broken and the portion of the container lid 102 other than the pilfer-proof hem 118'' is rotated and moved upward in the axial direction, thereby causing the annular seal 110 and the neck portion 1 to
Once a gap is created between the edges of the container lid 102, the pressure that may exist within the container will exceed the gap and then build up in the container lid 102, as will be readily understood by reference to FIG. It is reliably opened to the outside through the ventilation hole 119. Therefore, after the female thread 124 on the container lid 102 and the male thread 132 on the neck portion 130 are partially tightened, a relatively high pressure inside the container acts on the container lid 102.
This ensures that the container lid 102 is not suddenly released from the mouth and neck region 130 and accidentally flies off, and that the accidental flying of the container lid 102 causes damage to the consumer. is definitely prevented.

Two specific examples of synthetic resin container lids constructed according to the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to these specific examples, and the scope of the present invention is not limited to these specific examples. Needless to say, it is possible to modify or modify the material without deviation.

To be sure, the above-mentioned specific examples are all types of container lids that have pilfer-proof properties, but the present invention is not necessarily limited to container lids that have pilfer-proof properties. It can also be applied to types of container lids that do not have pilfer-proof properties.

Further, in each of the specific examples described above, the annular seal is integrally formed on the inner surface of the top wall, but the present invention is not necessarily limited to such a form of container lid; The present invention can also be applied to containers in which a formed annular seal is disposed on the inner surface of the top wall.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a first specific example of a synthetic resin container lid constructed according to the present invention. 2 is a side view, partially in section, of the container lid of FIG. 1; FIG. FIG. 3 is a side view, partially in section, showing the container lid of FIGS. 1 and 2 attached to the mouth and neck of the container. FIG. 4 is an exploded perspective view showing a second specific example of a synthetic resin container lid constructed according to the present invention. FIG. 5 is a side view, partially in section, of the container lid of FIG. 4. FIG. 6 is a side view, partially in section, showing the container lid of FIGS. 4 and 5 attached to the mouth and neck of the container. 2 and 102--Container lid 4 and 104--First member 6 and 106--Second member 8 and 108--Top wall 12 and 112-Skirt wall Patent applicant: Japan Crown Cork Co., Ltd., etc. 2 figs, 3 figs, 5 figs, 6 figs.

Claims (1)

[Scope of Claims] 1. A container lid made of synthetic resin having a top wall and a cylindrical skirt hanging from the periphery of the top wall, including at least a first member defining the top wall; and a second member defining a lower portion of the skirt wall, respectively, and
The first member and [! A container lid made of synthetic resin, characterized in that it is formed by at least partially joining two members together. 2. Made of synthetic resin according to claim 1, wherein the first member #''i together with the ceiling and wall surface define the upper part of the skirt drop, and the second member #''i defines the lower part around the skirt. Container lid. 3. A container lid made of synthetic resin according to claim 1 or 2, wherein an Fi-shaped seal is disposed on the inner surface of the top surface of the nucleus. 4. The annular seal is attached to the top wall. 5. The first member is molded from a relatively soft synthetic resin, and the second member is formed from a relatively soft synthetic resin. 6. A synthetic resin container lid according to claim 4, which is molded from a synthetic resin. 6. The lower part of the skirt wall defined by the second member has a weakened line extending in the circumferential direction. The lower part of the skirt wall is divided into a thread part located above the weakened line and a pilfer-proof hem part located below the weakened line. A female thread is formed on the inner circumferential surface of the pilfer-proof hem, and the inner circumferential surface of the pilfer-proof hem is formed with at least one flap piece projecting radially inward. The synthetic resin container lid according to any one of items 1 to 5. 7. The first member and the second member are joined to each other at a plurality of joining regions spaced apart in the circumferential direction. , a container made of synthetic resin according to any one of claims 1 to 6, wherein a flight prevention vent is defined between the plurality of joint regions.8. In each joining region, the first member is formed with a recess or a protrusion, and the second member is formed with a corresponding protrusion or recess, and the recess and the protrusion are interconnected. 9. The synthetic resin container lid according to claim 7, wherein the first member and the second member are joined to each other in the joining region by joining them together. The member made of synthetic resin according to any one of claims 1 to 8, wherein the member and the second member are mutually post-cooled by heating and melting them and forming a melt layer in the joining region. Container amount. 10. The synthetic resin container lid according to claim 9, wherein the first member and the second member are heated and melted by ultrasonic waves in the joint region. 11. 10. The synthetic resin container lid according to claim 9, wherein the first member and the second member are heated and melted by high frequency dielectric.