JPS63162465A - Thermoplastic cover member - 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 FIELD OF APPLICATION This invention relates generally to a threaded part H, and more particularly to the 23 member of a threaded container for carbonated beverages.
Ru.

Prior art and its problems The use of threaded necks for beverage bags has become very popular. This trend is partly due to the fact that consumers can open the package by simply unscrewing the lid from the container (because of the "bottle opening"). 0 Shells are not required at all. An advantage of this is that the consumer can remove the lid, remove some of the contents from the container, and reattach the lid to the container by simply screwing it back on. The sealing means generally function so faithfully that there is little loss of carbonic acid;
The packaged residue can be used later as appropriate.

Despite these advantages, containers with threads -
Packages with lid members present severe problems.

That is, there is a problem in that the lid member is suddenly released from the container, which occurs when operated with strong force. This rapid release of the lid occurs when the user turns the lid and removes it from the container. ,
When the lid is rotated, the lid moves axially upwardly, thereby breaking the seal between the top wall of the lid and the bottom of the container. This failure of the seal allows compressed gas to flow between the side wall of the lid member and the container. If the closure is removed before this gas is bled from the container, the closure will be pushed away by a strong force when it is disengaged from the threads of the container, causing Consumers will be exposed to danger.

One of the most common threaded closures used to package carbonated products is the metal cap found everywhere. This type of lid member has lρ
In order to prevent sudden release, it has been proposed in the prior art to form a single bleed slot through the thread on the container side. This slot forms a path for the compressed gas to be extracted. US I5 Patent No. 4.007.
See No. 84E3. U.S. Patent No. 4.007.8
No. 51 discloses another method for bleeding metal lids. This lid member has at least one bleed hole 41 near the joint between the side wall and the wall 10, through which compressed gas can pass. Another type of device employing peripheral bleed air is shown in U.S. Pat. No. 1,739.659.

In the case of thermoplastic closures, attention has been given to providing various configurations of bleed channels or bleed devices to release If condensation gas while the closure is being removed from the container. Some developments along these lines are, for example, U.S. Patent No. 3.888°347''F'3.
No. 521, and No. 4°427.126.

1. Standing sword According to the present invention, a standard air extraction device for a thermoplastic lid member is provided. This bleed device quickly and safely bleeds a relatively large volume of compressed gas while the r member is unscrewed from the container and before the lid member is disengaged from the threaded portion on the container side. Able to do it J: It is the size of a sea urchin.

SUMMARY OF THE INVENTION It is therefore a first object of the present invention to provide a bleeder lid for drinking water bottles such that a relatively large volume of carbon dioxide can be bleeded quickly and safely while the lid member is removed from the bottle. It is to provide parts.

Another object of the present invention is to reduce the tension of the lid side thread on the bleed blade so as not to cause distortion of the thread or clogging of the bleed part.

Yet another object of the invention is to reduce the tooling costs of the core equipment used to form the threads and bleeds.

Yet another object of the invention is to provide a closure that can be removed from a pressurized threaded container without the risk of the closure being blown off.

Other objects and advantages of the invention will be described below with reference to the drawings.
(I) will be readily apparent to history by reading the explanation.

BACKGROUND OF THE INVENTION The present invention relates to a threaded thermoplastic lid member adapted for air bleed for a threaded one-piece neck. The lid member, i.e. the bottle, includes one or more air bleed grooves,
The air bleed groove is cut through a first thread formed on the inner wall of the skirt of the lid member.

The ends of each thread segment are rounded, and a small reinforcing second thread within the groove extends transversely to connect the lower ends of the thread segments. . This reinforcing thread has a smaller cross-sectional area than the adjacent first thread segment, and its lower edge (lower edge) refers to the thread edge on the side closer to the bottom of the container to which the lid member is attached. is positioned in it at a location such that it is aligned (located in the same plane) with the lower edge of each of two adjacent first thread segments. This maximizes the size of the bleed space for compressed gas to escape while the lid is unscrewed from the threaded fj. This thus allows the gas within the container to be released quickly while the side threads remain engaged with the container threads. Therefore, once the lid member is rotated to a position where it is disengaged from the container, the internal pressure of the container has already been sufficiently released and the lid member will not be blown away.

Container-lid packages are well suited for use in packaging products such as carbonated beverages that generate pressure within the package. The thermoplastic lid member has a top wall and is formed with an annular side wall depending downwardly from the top wall. Lid threads are formed around the inner surface of the annular side wall and are adapted to cooperate with threads formed on the container neck. A sealing device is provided above the lid thread and is adapted to form a gas-tight seal between the lid member and the container. The mouth seal device can be either a linerless device or a vR gastric device that uses a liner. Such arrangements are well known to those skilled in the art, and the only necessity for using a sealing device with the lid of the present invention is to be able to maintain the expected internal package pressure. In order to release the internal pressure of the package when the lid of the invention is removed from the container with a screwdriver, the lid is characterized in that at least one bleed groove is formed in the side wall transversely of the thread. shall be. This air bleed groove of the lid member has four uniform parts. Reinforcing structures (second threads) are provided to increase the strength of the sidewall hoops in one or more of these bleed channels.

This structure is located at each portion where the bleed groove crosses the lid side thread. This reinforcing structure (second thread) is designed such that the height in the right angle direction measured from the inner surface of the side wall is lower than the height in the right angle direction of the lid side thread similarly measured from the inner surface of the side wall.
Dimensioned.

By providing the reinforcing structure with such small dimensions, the compressed gas can find a sufficiently large escape cross-sectional area in the bleed groove.

Positioning the reinforcing structure at one or more locations where the bleed groove and the lid side threads intersect means that this structure and the threads on the valley side and the container side cooperate in a similar manner. and,
This ensures that no portions are formed that do not engage with the threads between them. Also, as noted above in note C]'1, the lower edge of this small second thread is Il,! The first thread is aligned with the lower edge of the first thread to maximize the size of the bleed opening area through which the compressed gas flows during removal of the closure from the container.

The drinking water bleed device element of the present invention, which utilizes interrupted threads to form the bleed groove, has a number of advantages, including: 1jJt5, (1) The interrupted threads increase the four-part cross-sectional area for air bleed in the lid member.

(2) The lower surface of the first screw and the lower surface of the second screw are in the same plane and form a smooth space, as described in Yoneda Special Edition No. 4,427.126. This allows carbon dioxide to escape faster than would be possible by centrally positioning the second thread relative to the first thread.

(3) This smooth space part number in the thread is also P[[
The interference of a sear-shaped bleed groove in the neck part f1 of a bottle made of (polyethylene-Σphthalate) etc. is eliminated by Ijr.

These and other features of the invention, which contribute to satisfaction in use and ease of manufacture, will be appreciated by reference to the following description of the preferred embodiment and accompanying drawings.
It will be more fully understood by reading J. In the drawings, like reference numerals indicate like parts.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIGS. 1-4, the closure member of the present invention is generally designated by the numeral 10 and includes a it 44
is a top wall 12 and an annular side wall 14 hanging downward.
have. A spiral lid-side thread 16 is provided around the inner surface of the side wall 14. The lid side thread 16 engages with the container side thread 42, as shown in FIGS. 3 and 4, to apply mW to the lid member 1o relative to the container neck 4o.

The air bleed groove 1 extends from the upper position of the vessel side screw thread 16 to its lower position.
8 is extended. As shown in FIGS. 3 and 4, this air bleed groove 18 is formed on the inner surface of the side wall 14. As best seen in Figure 2,
Bleed grooves 18 interrupt the thread 16 and divide it into individual helically aligned segments. The bleed groove 18 has a depth such that it is recessed in the inner surface of the side wall 14 . The width dimension of the air bleed groove 18 is such that, as the stand piece 1 of the air bleed CA in use, the normal removal of the lid member 10 from the container takes place only after the air bleed has substantially taken place, at a certain speed. [I The bleed groove is set to have a cross-sectional area large enough to bleed the condensed gas.

The closure member 10 preferably has a plurality of air bleed channels 18 and is preferably made of a tough thermoplastic material such as polypropylene, polyethylene, or neuron. When used for rough 1~ drink bottles, the lid member of the present invention can dramatically increase the rate of extraction of carbon dioxide gas when removing the lid member from a compressed container, allowing the gas to be extracted uniformly. Becomes Noh. The air bleed grooves t in this lid member are uniform and are formed in four parts, and there is no difference in the finished state of the container neck when the lid member is attached.

The reinforcing structure 20 crosses the bleed groove at the location where it intersects the side thread 16 (ie, where the thread is interrupted). Regarding the embodiments shown in FIGS. 2, 3, and 4,
The reinforcing structure 20 has an approximately semi-elliptical cross section.

Whatever the shape of the reinforcing structure 20, the height 1 measured from the inner surface of the side wall 14 must be lower than the height of the lid thread 16, also measured from the inner surface of the 1111 wall 14. However, the height of this reinforcing structure section 20 is
The hoop strength of the sidewalls must not be so low that it cannot be increased to the required culm. Determining the height of the reinforcing structure 204.
1 Several factors, namely the expected pressure that will occur, the material of construction of the lid member, the capacity of the container used,
Based on the width and depth dimensions of one or more bleed grooves 18, the length of the lid side thread 16, and the degree of engagement between the lid side thread 16 and the container side thread 42. It will be done.

The ends 19 of each segment of thread 16 are rounded.

This eliminates, or at least entirely reduces, the possibility of hang-up or thread distortion when the closure member is attached to or removed from the container.

In order to maximize the size of the bleed space through which the compressed gas flows into the container while the shell member 10 is unscrewed from the container neck 40, the lower edge or surface 20a of the reinforcing structure 20 is
is aligned with the lower edge of the lid side thread 16, that is, with the lower edge 16a (
(Please note Figure 2). Since the GtM structure part 20 has a smaller A cross-sectional area than the lid side thread 16 (Figures 2 and 3 refer to the spout), at least the center of the reinforcing structure part 20 The edge or center surface is drawn 61 from the corresponding edge or surface of the lid side thread 16, thereby forming an enlarged bleed passage through which condensed gas flows, as shown in FIG. Preferably, the height and width of the reinforcing structure 20 are j
The height and width of the threads 16 are both less than 1, and all of the central and top edges of the structure 20 are offset from the corresponding edges of the threads 16. be.

In FIG. 3, the lid l4io is tightened against the container neck 40, and the top 44 of the neck 40 is
It can be seen that six seats are placed against the liner 24 of .

The arrow "Δ" acts on the liner 24 of this lid member J
This shows the power of carbon dioxide gas.

In FIG. 4, the lid member 10 is shown in a rearwardly retracted position in which the liner 24 of the vessel H is spaced from the top 44 of the neck 4o and the carbon dioxide gas is channeled into the groove. 1
8 and over the reinforcing Wi structure 0 which traverses the groove 18.

The arrow ′ indicates the path of this escaping gas.

FIG. 4 also shows that during this bleed operation, the lid-side thread 16 remains engaged with the container-side thread 42, thereby causing the internal L of the
[This shows the fact that the lid member 10 is prevented from being thrown off or pushed out of the container upon release of force.]

In Figure 1, three bleed area areas are shown.
As little as one is suitable, and four or more may be desirable. When air bleed occurs, the force of the carbon dioxide gas 11 inside the liner 24 of the lid member maintains the top of the lid thread 16 in contact with the bottom of the thread 42 formed in the neck. The air bleed groove 18 of the lid member 10 forms a space for air bleed. The starting and ending radii of the threads 16 should be as small as possible, 3/16 in. or smaller, to maximize the length of the full thread depth. Reinforcement structure part, i.e. second thread 2
0 is cut through the intersecting area, and is placed in line with the bottom of the interrupted first thread 16, so that the part l
This increases the strength of the hoop and provides maximum bleed area.

Figures 3 and 4 show the bleed of compressed gas from the package. It should be noted that as the closure member 10 is rotated about the container neck 40, the closure member 10 moves upwardly along the axis. This upward movement along the axis causes the liner 24 to move toward the top 4 of the container neck 40.
47 lock (pull/raise to be removed from the Q position by 1+11).

The compressed gas inside the container begins to move through the groove 18 as indicated by the arrow. As can be seen, the use of the reinforcing structure 20 does not impede the passage of condensed gas at all; Reinforcement can be achieved. When the lid member 10 continues to rotate for removal, the compressed gas continues to be extracted until the internal pressure of the package becomes equal to atmospheric pressure. Since the cooperation of the container side threads with respect to the lid side threads is not impaired, the removal of the lid member 1o is carried out under conditions in which there is no risk of removal of the lid member too rapidly.

An exemplary lid member is made of polypropylene and has a width of approximately 1,59a* (1/16 inch) and a width of approximately 0,13/0,38#lIN(c),005/
0.015in) deep bleed groove, sidewall thickness 0.89/1, 40nva (c), 035/0
．． 055 inches), and the lid-side threads distributed laterally across the 480-inch melon have a normal screw engagement and a reinforcing structure with a height about 2/3 of the thread height. There is. As explained just before, 0.89-1.14m(c),035
A lid member having a sidewall diameter of ˜0.045 inches has proven satisfactory for certain applications. As for other materials and depths and sidewall thicknesses for other bleed channels, the reinforcement structure 20 can be determined experimentally from observation and experience, both of which are consistent with the present description. It depends on the abilities of those skilled in the art.

For the illustrated embodiment, the sealing device uses a liner. This liner 24 is housed on the inner surface of the top wall 12. A retention bead can be used to hold the liner 24 in position adjacent to the inner surface of the top wall 12 when the vessel member 1o is not fitted into the container. Of course, this sealing device can be lined or unlined, and can be of any shape as long as it maintains a gas-tight seal under the conditions and internal pressures dictated by the package manufacturer. What can be done with and b will be improved.

The lid member of the present invention can be made by conventional injection molding techniques. Is this lid part manufactured? Thermoplastic materials that can be used for the lid are those commonly used in the manufacture of lid members. For example, each member can be made of high density polyethylene, polypropylene, Norilon, or the like.

Any other suitable thermoplastic material may also be used.

Elements of the type of the invention are often tambour-brown (t
AllElorDroor) is in the form of a lid.

Tamper-proof type devices for use with thermoplastic closures are disclosed in U.S. Pat.
9.889M. This device uses a breakable band attached to the lowest end of the lid sidewall by a plurality of non-breakable ribs. For simplicity of illustration, such breakable bands are not shown in the drawings.

The foregoing illustrations and description of the invention are illustrative and explanatory, and various changes to the structure shown may be made without departing from the spirit of the invention and within the scope of the claims of the invention. It can be done within this range.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the lid member of the present invention, viewed from the bottom to the top. FIG. 2, t, is a cross-sectional view taken along line 2--2 of FIG. FIG. 3 is an enlarged partial cross-sectional view showing the closure shown in FIGS. 1 and 2 tightened to the finished neck of a compressed container; FIG. 4 is a partially enlarged sectional view showing a passage for compressed gas to escape when the lid member shown in FIGS. 1 and 2 is removed from the container. DESCRIPTION OF SYMBOLS 10... Lid member 12... IC1 wall 14... Side wall 16... Thread on the lid side, i.e., first thread 18... Bleed groove 20... Reinforcement structure, i.e., the first thread Two screw threads 24...Liner 40...Neck 42...Container side thread

Claims (9)

[Claims] (1) A thermoplastic closure member suitable for fitting over a threaded neck of a container, comprising: (a) a top wall; (b) an annular side wall depending downwardly from the top wall; c) a first lid-side thread formed on the inner surface of the annular side wall so as to cooperate with a thread formed on the neck of the container, the first lid-side thread being a plurality of first thread segments separated by one or more bleed grooves; (d) at least one bleed groove formed in the side wall crosses the thread on the lid side; , the air bleed groove divides the first thread on the lid side and divides the first thread to form the first thread segment; (e) formed in the air bleed groove, A second reinforcing thread connects the first thread segments of the first thread on the lid side across the bleed groove, and the second thread is higher than the first thread segment. a lower edge portion of the second thread is aligned with a lower edge portion of each adjacent first thread segment; and at least a central portion of the second thread is lower than the first thread segment. offset from a corresponding portion of the segment; and (f) sealing means disposed above the lid thread to form a gas-tight seal between the lid member and the container. A thermoplastic lid member. (2) The thermoplastic lid member according to claim 1, wherein both ends of the first thread segment are rounded. (3) The thermoplastic lid member according to claim 1 or 2, which is made of polypropylene. (4) Claim 1 made of polyethylene
Thermoplastic lid member according to item 1 or 2. (5) The thermoplastic lid member according to claim 1 or 2, which is made of high-density polyethylene. (6) The thermoplastic lid member according to claim 1 or 2, which is made of nylon. (7) a bleed groove sufficient to bleed pressurized gas at a rate such that normal removal of said closure member from said threaded neck occurs only after bleed has substantially ceased; 7. The thermoplastic lid member according to claim 1, wherein the number and depth of the bleed grooves formed in the side wall are selected to form a cross-sectional area. (8) A plurality of said bleed grooves are provided in the side wall, each bleed groove includes at least one said second thread, both ends of said first thread are rounded, and the bleed air is substantially forming a bleed groove cross-section sufficient to bleed compressed gas at a rate such that normal removal of said closure member from said threaded neck occurs only after Any one of claims 1, 3, 4, 5, and 6, wherein the number and depth of the bleed grooves formed in the side wall are selected. The thermoplastic lid member described in . (9) A thermoplastic lid according to claim 8, wherein a central edge portion and an upper edge portion of each of the second thread segments are offset from a corresponding portion of the first thread segment. Element.