JP3318752B2 - Sealed cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is used to prevent the contents contained in packaging containers for food and drinking water from being illegally opened in the distribution process and to guarantee the quality. The present invention relates to a sealing cap.

[0002]

2. Description of the Related Art Generally, glass bottles for foodstuffs and drinking water and PET containers made of plastics are used. This is because the sealing band is cut when the cap is opened, but the safety of the consumer cannot be guaranteed due to the broken surface or the like. At present, when the PL Act is enacted, the safety has been reviewed in order to guarantee the quality of the contents and protect the user from the danger of injury, and mechanical type sealing caps of synthetic resin materials have been used. . These mechanical-type sealing caps are roughly classified into mechanical-type sealing caps, which are mass-produced by a compression molding method, and injection-molded mechanical-type sealing caps. According to conventional technical thinking, various types of sealing caps have been developed to prevent unauthorized opening during the distribution process, mixing of poisons, and replacement of contents. In the case of the cap described above, there is a problem in the locking structure that is locked to the lower peripheral surface of the bulging portion of the container, and the locking form of the mechanical sealing type cap formed by the compression molding method hangs on the inner peripheral wall of the band. The tongues are radially formed toward the center of the band, and when the cap is rotated clockwise, the tongues buckle to the left to reduce the resistance when the cap is closed and open. When rotating in the counterclockwise direction when the stopper is rotated, a plurality of tongues bent in contact with the outer diameter of the lower part of the bulge of the container are erected and a plurality of tongues of a vertical shape are provided on the lower peripheral surface of the bulge of the container. Are configured to be locked. However, since the locking tongue is a thin tongue, the tongue is lacking rigidity when pressed to open and is deformed into a curved state, and is rotated upward by the amount of the bending to lock. Is delayed. A gap is formed between the packing surface of the container and the cap by the time difference, and a defect of overflow of the liquid agent and ejection of the carbonated drinking water gas has occurred.

Further, in a conventional sealing cap of a mechanical type of various types of injection molded articles, Japanese Patent Application Laid-Open No.
Registration of Utility Model No. 2 Partially Improved No. 3682 and Locking Part
There is a Bilfer Bruch cap of Japanese Patent No. 001438 and a form of Japanese Patent Application Laid-Open No. 6-183450. In these common forms, a band portion is integrally formed from a lower end of a cap body via a rib of a cuttable portion. Since the plurality of locking tongues are bent from the lower end of the band portion and are continuously provided, the thickness of the band portion is formed thin. Therefore, when the container is opened, the tongue piece lacks rigidity when pressed against the lower peripheral surface of the bulging portion of the container, and is deformed into a curved state. In addition, due to the lack of rigidity of the thin band portion, the band portion is deformed into a curved state, and the band is rotated upward by the amount of the bending and the locking time is delayed, and a gap is formed between the packing surface of the container and the cap by the time difference. Defects have occurred, such as liquid overflow and carbonated drinking water gas spouting. As described above, at present, the shape of the locking form and the form of the band formed on the lower peripheral surface of the bulging portion of the container are problematic.

A particular problem is that when the cap body is to be unplugged from the torsion opening of the container, the cap body and the band are integrated and the torsion opening of the container is rotated upward without releasing the sealing function. In addition, there is a gap between the packing of the cap body and the upper surface of the mouth of the container, which causes a defect of overflow of the liquid agent and ejection of the carbonated drinking water gas. This is a problem with sealed caps where no improper behavior is confirmed from the appearance.If there is a mischievous act such as rotating the cap body and leaving the contents of the container without releasing the sealing function, There is a problem in guaranteeing the quality of the contents. Particularly, in the case of carbonated drinking water, it is impossible to guarantee the quality of the contents due to the ejection of the gas.

[0005] In addition, after the sealing cap is opened, the cut band portion comes into close contact with the outer diameter of the lower part of the bulging portion of the container, and it is difficult to take it out easily. is there.

[0006] In addition, although a sealing cap is produced by an injection molding method, a separating slit portion has a split mold structure in the left-right direction on an injection-molding mold structure in a separation form of the cap and the band portion. For this reason, the number of set product parts is limited to a small number, the quantity produced from the mold is small, the productivity is low, and the cost is affected.

[0007]

A comparison between the conventional metal cap and the synthetic cap made of synthetic resin shows that the metal cap has a drawback of danger due to injury or the like when the band is cut. The locking part is completely press-fitted to the outer periphery of the inflatable part of the container by roll-tightening, and there is no problem in cutting the sealing connection part when opening the cap, ensuring the quality of the contents. Therefore, it is used for a large amount of commercially available drink bottles and the like. Compared to these, in the case of a sealing cap made of synthetic resin, the rigidity of the form that is locked to the lower peripheral surface of the inflatable portion of the container and the form of the band are a common drawback. The shape of the stop shape and the band portion is formed into a shape comparable to the rigidity made of metal and can cope with the pressure locked when the plug is opened, and solves the above-mentioned defect in which the overflow of the liquid agent or the gas of the carbonated drinking water is ejected. Structure and function are important issues. In addition, easy removal of the band remaining on the lower peripheral surface of the inflated portion of the container when the cap is opened is a problem to be solved for resource recycling, and furthermore, matches the shape of the molded product. There is also a problem to be economically produced by the mold structure.

Accordingly, the present invention relates to a sealing cap for injection molded articles made of synthetic resin, which has rigidity and a complete locking function on the lower peripheral surface of an inflatable portion of a container, and has a function and function to completely lock the PET bottle or glass bottle. It is also an object of the present invention to solve the above-mentioned problem.

[0009]

Means for Solving the Problems In order to achieve the above object, the sealing means A according to the present invention has the following solutions. That is, in the screw cap of a molded product made of a synthetic resin material having an appropriate elasticity, the inside of the band portion 3 through the bottom surface 1a of the lower portion of the cap body 1 having a plurality of knurls 2 formed on the outer periphery and the slit 5 for separation. There is a sealing cap integrally formed by a plurality of sealing connection ribs 4 formed on the peripheral wall, and a peripheral rib 6 inclined downward is provided on the inner peripheral wall of the band portion 3, and the peripheral edge thereof is provided. A plurality of ratchets 7 are connected to each other, and a guide piece 7c protrudes from an upper end of a locking end face 7b at a tip of the ratchet 7. A cross-sectional shape of the plurality of sealing connection ribs 4 is a lower portion of the cap body 1. The outer edge 1b and the inner peripheral surface 3a of the upper surface of the band portion 3 are formed with an inclined surface 4a. The portion 8 was formed.

Further, in the present invention, a plurality of downwardly inclined reinforcing ribs 16 are provided on the inner peripheral wall of the band portion 13, a ratchet 17 is continuously provided on the peripheral edge thereof, and a locking end face 17b is provided at the distal end thereof. A guide piece 17c is protruded from the upper surface of each of the plurality of ratchets 17, and the width of the tips of the plurality of ratchets 17 is wider than the width of the root portion.
Was formed.

Further, according to the present invention, a peripheral rib 6 extending downward is provided on the inner peripheral wall of the band portion 3, and a plurality of ratchets 7 are continuously provided on the peripheral edge thereof, and a locking end face 7 is provided at the distal end thereof.
It is also characterized by a structure formed by a guide rib 9 connected in a semi-annular shape to the center of the upper surface of the locking end surface 7b of the plurality of ratchet pieces 7 adjacent to the left and right from the center of the upper surface of b.

Further, in the present invention, the cross-sectional shape of the plurality of sealing connection ribs 4 is such that the lower outer edge 1b of the cap body 1 and the inner peripheral surface 3a of the upper surface of the band portion 3 are formed with the inclined surface 4a. For this reason, when the separating slit 5 is interposed between the cap body 1 and the band portion 3, the mold structure formed by the injection molding method is a complicated left-right split mold structure. The mold structure for forming the separation slit 5 of the molded product is formed by a mold cavity a for forming the outer shape of the cap body 1 and the band portion 3 and a mold core b for forming the screw shape. It also features a structure in which a peripheral portion has a butting and hitching type mold structure, and a number of product parts are formed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 16, reference numeral A denotes a sealing cap according to the present invention, which is integrally formed of a synthetic resin material having appropriate elasticity.

The sealing cap A of the present invention comprises a lower bottom surface 1 of a cap body 1 having a plurality of knurls 2 formed on the outer periphery.
a and a sealing cap integrally formed with a plurality of sealing connecting ribs 4 formed on the inner peripheral wall of the band portion 3 through the separating slit 5, and the inner peripheral wall of the band portion 3 faces downward. A plurality of ratchets 7 are continuously provided on the periphery of the ribs, and a guide piece 7c is protruded from the top of a locking end face 7b at the tip of the rib. The cross-sectional shape of the connecting rib 4 for the lower outer edge 1 of the cap body 1
b and the inner peripheral surface 3a of the upper surface of the band portion 3 are formed with inclined surfaces 4a, and the width of the tip of the plurality of ratchets 7 is wider than the width of the root portion. 8 is formed.

The locking end surfaces 7b at the tips of the plurality of ratchets 7 are engaged with the lower peripheral surface of the inflatable portion of the container by a guide piece 7c protruding from the upper surface of the ratchet 7 so that the inflatable portion of the container can be prevented. The locking end surfaces 7b at the tips of the plurality of ratchets 7 are locked while being pressed against a stable position in contact with the outer peripheral surface, and the band portion 3 is fixed. In particular, the guide piece 7c protruding from the upper surface is formed such that the locking end faces 7b at the tips of the plurality of ratchets 7 are bent at a fixed acute angle with the hinge portion 8 as a fulcrum, and are uniformly engaged with the lower peripheral surface of the expanding portion of the container. It features a stop function.

Further, a plurality of ratchets 7 connected to the peripheral edge of a peripheral rib 6 which is obliquely provided downward on the inner peripheral wall of the band portion 3 are formed in a hinge shape at the base portion by a mountain-shaped groove 7a, and the hinge is formed. A rigid ratchet 7 which is bent at an acute angle with the portion 8 as a fulcrum is formed. Further, the band portion 3 is reinforced by peripheral ribs 6 slanting downward on the inner peripheral wall and formed in a rigid shape. Therefore, when the cap body 1 rotates and rises when the cap is opened, the band portion 3 including the locking end surfaces 7b at the tips of the plurality of ratchets 7 which lock on the lower peripheral surface of the inflated portion of the container undergoes a curved deformation with respect to the pressing. It can be completely locked by the rigid body without any occurrence.

As shown in FIGS. 1 to 16, the above-mentioned sealing cap is used for a drink bottle, a liquor bottle, a PET bottle for drinking water, a sealing container having a relatively large diameter, or the like in a distribution process. It is a sealing cap. The sealing cap A1 shown in FIGS. 3 and 4 is provided with a plurality of downwardly sloping reinforcing ribs 16 on the inner peripheral wall of the band portion 13, and a ratchet 17 is continuously provided on the peripheral edge thereof. A guide piece 17c protrudes from the upper surface of the toe end face 17b. The width of the tip of each of the plurality of ratchets 17 is wider than the width of the root portion, and the hinge portion 18 is formed at the root portion with a mountain-shaped groove 17a. Structure, especially large glass bottles and PE
When used for a T-bottle, the thickness of the reinforcing ribs 16 is formed in a timely manner so that the reinforcing ribs 16 can be adapted to the above-mentioned container.

The sealing cap A2 shown in FIGS.
A peripheral rib 6 extending downward on the inner peripheral wall of the band portion 3;
A plurality of ratchets 7 are continuously provided on the periphery thereof, and a tip thereof has a half at the center of the upper surface of the locking end surface 7b of the plurality of ratchet pieces 7 adjacent to the left and right from the upper surface center of the locking end surface 7b. A characteristic structure formed by the guide ribs 9 connected in an annular shape, wherein the guide ribs 9 in which the locking end faces 7b of the plurality of ratchets 7 are connected in a semi-annular shape, the lower peripheral surface of the inflated portion of the container. It is formed so that it can be locked with stable and uniform contact when it is locked.

As shown in FIG. 7, the enlarged sectional view of the cap A shows the inclination angle θ of the sectional shape of the plurality of connecting ribs 4 for sealing.
Is set to 20 degrees or less, and the guide piece 7c protruding from the upper surface of the locking end surface 7b of the plurality of ratchets 7 that locks to the lower peripheral surface of the inflated portion of the container comes into contact with the outer periphery of the inflated portion of the container. When the ratchet 7 has an angle of inclination α of 1 with the hinge 8 as a fulcrum,
It is formed to be set to 5 degrees or less.

As shown in FIG. 8, the enlarged sectional view of the cap A shows a peripheral rib 6 which is inclined downward in the inner peripheral wall of the band portion 3, and a plurality of ratchets 7 are connected to the peripheral edge thereof. FIG. 9 is a diagram showing a release state when a form having a guide piece 7c protruding from an upper surface of a locking end face 7b at its tip is injection-molded.

As shown in FIG. 9, an enlarged sectional view of the cap A shows a plurality of ratchets 7 and a locking end face 7 in which a sealing cap screwed to the container locks on the lower peripheral surface of the inflatable portion of the container.
It is a figure showing the state where guide piece 7c projected from the upper surface of b contacted the perimeter of the expansion part of the container. The enlarged sectional view of the cap A shown in FIG. 10 is a view showing the sealing cap screwed into the container.

An enlarged sectional view of the cap A shown in FIG.
When the sealing cap screwed to the container is opened, the plurality of sealing connection ribs 4 of the band portion 3 are cut, the sealing is released, and the container drops once at the lower part of the neck of the container, and the container is once opened. The band 3 can be easily taken out of the container because the inner peripheral surface of the band 3 does not adhere to the outer shape of the expanded portion of the container.

As shown in FIG. 12, the cross-sectional shape of the plurality of sealing connection ribs 4 and the separation slit 5 are formed by the lower outer edge 1b of the cap body 1 and the inner peripheral surface (3) of the upper surface of the band portion 3.
FIG. 4A is a mold structure diagram for injection-molding a molded product formed with an inclined surface (4a) in FIG. Slit 5 for separation of molded article of the present invention
Is formed by a mold body forming the outer shape of the cap body 1, the inclined surface 4a, the band portion 3, and a mold core b forming the screw shape. , And is composed of a core c and an extruded plate d on the lower surface of the plurality of ratchets 7, and the runners and gates are pin-point gates e or submarine gates f as appropriate depending on the appearance of the molded product.
FIG. 2 is a structural view of an injection molding die that can take a large number of molded products by a method.

In the above embodiment, the sealing cap of the present invention is formed by integral molding.
As shown in FIG. 4, the sealing cap A3 is
This is an embodiment showing a one-piece sealing cap which is a packingless form having a chevron-shaped ring 19 and an inner plug 20 with a foot formed at the bottom of the cap.

As shown in FIGS. 15 and 16, the sealing cap A4 is provided with a slit 22 provided perpendicularly to the connecting rib 21 in the band portion 3 when the sealing connecting rib is cut when the cap body 1 is opened. This embodiment shows a form in which the band portion 3 is cut by the chevron-shaped groove portion 23, connected to the connection rib 21, integrally separated from the cap body 1, and does not remain below the neck of the container.

Although the representative embodiment of the present invention has been described above, the present invention is not necessarily limited to the above-described embodiment structure, but includes the structural requirements of the present invention and is within a range having an effect. It is needless to say that the above can be changed and implemented in a timely manner.

[0027]

According to the first aspect of the present invention, the sealing cap (A) of the present invention is embodied in the above-described embodiment and has the following effects. Since it is compatible with a wide variety of PET bottles and glass bottles of conventional sealed containers, there is an economical effect that it is possible to easily produce a large variety of small products.

In particular, in the sealing cap (A) of the present invention, a plurality of sealing connecting ribs 4 formed on the inner peripheral wall of the band portion 3 through the lower bottom surface 1a of the cap body 1 and the separating slit 5 are provided. The cross-sectional shape is a sealing cap formed integrally with the lower outer edge 1b of the cap body 1 and the inner peripheral surface 3a of the upper surface of the band portion 3 with the inclined surface 4a. Since it is manufactured in a high productivity, it has a high productivity and has an economic effect.

In particular, since the sealing cap of the present invention is constructed as described above, the rigid band portion 3 and the plurality of ratchets 7 having a rigidity comparable to those made of metal when the cap is screwed into the container and opened are hinged. The band portion 3 is formed so as to be bent at an acute angle with the portion 8 as a fulcrum and locked while being pressed against a lower peripheral surface of the inflatable portion of the container by a guide piece 7c at a stable position. When the cap is subsequently opened, the sealing connection rib is quickly cut, so that the cap body 1 and the band portion 3 can be quickly separated. Therefore, there is an effect that the quality assurance of the contents of the container is ensured, and in particular, there is an effect that the disadvantages such as overflow of the liquid agent and ejection of the carbonated drinking water gas are solved.

Further, since the inner peripheral surface of the band portion 3 does not adhere to the outer shape of the expanded portion of the container, the band portion 3 can be easily taken out of the container.

In particular, the sealing cap of the present invention is a form that can be used for a glass bottle, which was impossible with the locking form of the conventional sealing cap, and has an effect of expanding the range of use.

Further, according to the construction of the second, third and fourth aspects,
In addition to the above-mentioned effects, a shape corresponding to a variety of containers can be formed, and an epoch-making effect can be increased.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along the line II in FIG. 2, showing one embodiment of a sealing cap according to the present invention.

FIG. 2 is a bottom view of the sealing cap A.

FIG. 3 is a cross-sectional view of the sealing cap A1 along a rolling line in FIG. 4;

FIG. 4 is a bottom view of the sealing cap A1.

FIG. 5 is a cross-sectional view of the sealing cap A2 taken along the line C-A of FIG.

FIG. 6 is a bottom view of the sealing cap A2.

FIG. 7 is a partially enlarged sectional view in which the sealing cap A is fitted to a container.

FIG. 8 is a partially enlarged cross-sectional view of the molded product of the sealing cap A after release.

FIG. 9 is a partially enlarged cross-sectional view showing a state where the sealing cap A is inserted into a container.

FIG. 10 is a sectional view showing a state where the sealing cap A is inserted into a container.

FIG. 11 is a sectional view showing a state where the sealing cap A is opened from a container.

FIG. 12 is a partial sectional view of a mold structure of the sealing cap A.

FIG. 13 is a sectional view showing a state where the sealing cap A3 is inserted into a container.

FIG. 14 is a sectional view showing a state where the sealing cap A3 is opened from a container.

FIG. 15 is a front view showing a state where the sealing cap A4 is inserted into a container.

FIG. 16 is a front view showing a state where the sealing cap A4 is opened from a container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap main body 1a Lower bottom surface 1b Lower outer edge 2 Knurl 3 Band part 3a Inner peripheral surface of upper surface of band part 4 Sealing connection rib 4a Inclined surface 5 Separation slit 6 Slanted peripheral rib 7 Ratchet 7a Mountain-shaped groove 7b Locking end face 7c Guide piece 8 Hinge part 9 Guide rib A Sealing cap A1 Sealing cap A2 Sealing cap A3 Sealing cap A4 Sealing cap B Container B1 Expanding part B2 Lower peripheral surface B3 Outer part of expanding part P Packing 13 Band part DESCRIPTION OF SYMBOLS 16 Inclined reinforcing rib 17 Ratchet 17a Angled groove 17b Locking end face 17c Guide piece 18 Hinge part 19 Angled ring 20 Foot plug 21 Connection rib 22 Slit 23 Angled groove a Cavity b Core c Lower surface Core d Extruded plate e Pinpoint gate f Submarine Over door

Claims (3)

(57) [Claims] 1. A threaded cap made of a synthetic resin material having a suitable elasticity, wherein a bottom surface (1a) of a lower portion of a cap body (1) having a plurality of knurls (2) formed on an outer periphery thereof and a separating slit. (5) a sealing cap formed integrally with a plurality of sealing connecting ribs (4) formed on the inner peripheral wall of the band portion (3),
The inner peripheral wall of the band portion (3) is provided with a peripheral rib (6) inclined obliquely downward, a plurality of ratchets (7) are continuously provided on the peripheral edge thereof, and a locking end face (7b) is provided at the tip thereof. A guide piece (7c) protrudes from an upper surface of the cap, and the outer surface and cross-sectional shape of the plurality of sealing connection ribs (4) are the lower outer edge (1b) of the cap body (1) and the band portion (3). Inner peripheral surface of the upper surface (3
a) is formed with an inclined surface (4a), and a plurality of ratchets (7) are formed such that the width of the locking end surface at the tip is wider than the width of the base, and the groove (7a) has a mountain-shaped groove at the base. A sealing cap forming a hinge portion (8). 2. A plurality of downwardly inclined reinforcing ribs (16) are provided on the inner peripheral wall of the band portion (13), and a ratchet (17) is continuously provided on the peripheral edge thereof. (17
A guide piece (17c) protrudes from the upper surface of (b), and a plurality of ratchets (17) are formed such that the width of the locking end face portion at the tip is wider than the width of the root portion, and the mountain-shaped groove (17) is formed at the root portion. 1
The sealing cap according to claim 1, wherein the hinge part (18) is formed at 7a). 3. An inner peripheral wall of the band portion (3) is provided with a downwardly extending peripheral rib (6), and a plurality of ratchets (7) are continuously provided on the peripheral edge thereof, and a locking is provided at the tip thereof. End face (7
2. The sealing cap according to claim 1, wherein the sealing cap is formed by a guide rib (9) connected in a semi-annular shape to the center of the upper surface of b).