JP2023066434A - cap - Google Patents

Abstract

To provide a cap with which necessary and sufficient opening area can be secured for smooth air replacement without weakening de-energizing effect, occurrence of weld lines around the air exchange hole during injection molding can be suppressed.SOLUTION: A discharge cylinder 7 has a cylindrical part 73 consisting of an outer region 71 extending outward from the container and an inner region 72 extending inward from the container with the discharge cylinder support part 61 as the boundary in the axial direction of a cap body 4, a bottom end part 74 forming a rear end surface of the inner region 72 and a discharging port 75 opening on the bottom end part 74, a flow rate adjustment part 9 has multiple air replacement holes 94 formed around the discharging port 75 along the axis of the cap body 4 in the inner region 72 of the discharge cylinder 7 and a rib 96 that divides the opening holes 95 of the air replacement holes 94 into multiple parts in the circumferential direction of the discharge cylinder 7.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a cap to be attached to a container, and relates to a technique for suppressing the generation of weld lines during injection molding by reducing the flow of liquid during pouring.

Conventionally, there is a cap described in Patent Document 1, for example, as this type of cap. The cap body is composed of a fitting part fitted to the mouth of the container or fitted with a screw, and an inner lid extending inwardly from the upper end of the inner periphery of the fitting part and closing the mouth of the container. a wall, a pouring nozzle erected from the periphery of the pouring port penetrating approximately the center of the inner lid wall, and a buffer mechanism provided below the pouring port (within the inner space of the mouth of the container). there is

The cushioning mechanism relieves the momentum of the content liquid when the container is tilted for pouring out the content liquid, and has an annular side wall that hangs down from the periphery of the spout and a bottom plate that closes the lower end of the side wall. The side wall is provided with a plurality of slit-shaped openings that allow the liquid to pass through when the container is tilted, and are formed at intervals in the circumferential direction. It also functions as an air exchange hole.

JP 2019-189324

In the cushioning mechanism described above, the flow of the content liquid is damped by the resistance of the bottom plate below the spout, and when it enters the spout nozzle through the opening in the annular side wall that hangs down from the inner lid wall. , the flow direction is deviated from the axial direction of the container to the radial direction.

However, when the content liquid flows out from the spout into the spout nozzle, it flows out in the axial direction of the container and then along the inner surface of the spout nozzle parallel to the axial direction of the container. Therefore, it is not possible to sufficiently reduce the flow of the content liquid.

In addition, since the opening in the side wall has a slit shape, the slit should be formed long in the axial direction of the container in order to secure the opening area necessary for pouring out the content liquid and replacing the air in the opening in the side wall. As a result, the separation distance between the spout and the bottom plate becomes large, and the energy reducing effect is weakened.

The present invention is intended to solve the above-mentioned problems, it is possible to secure the necessary and sufficient opening area for smooth air replacement without weakening the energy reducing effect, and the occurrence of weld lines during injection molding around the air replacement hole. An object of the present invention is to provide a cap capable of suppressing

In order to achieve the above object, the cap according to the present invention has a cap body to be attached to the mouth of a container, the cap body comprising a main body surrounding the mouth of the container around the axis of the container, and a cap inside the main body. The pouring tube provided in the pipe and the flow rate adjusting part provided in the pouring tube are integrally molded, and the main body is connected to the outer peripheral surface of the pouring tube, and the inside of the main body is divided into an outer area and an inner area. The pouring tube has an outer region extending outward from the container and an inner region extending inward from the container with the pouring tube support portion as a boundary in the axial direction of the cap body. a bottom end forming the inner end surface of the inner region; and a spout opening at the bottom end. and a plurality of ribs dividing the opening of the air replacement holes in the circumferential direction of the pouring cylinder.

The cap according to the present invention is characterized in that the air replacement hole is formed in the inner region of the cylindrical portion.

In the cap according to the present invention, the rib is arranged at a specific position of the air exchange hole, and the specific position is such that the molten resin flowing from the cavity at the bottom end of the pouring tube to the cavity of the cylindrical part during injection molding replaces the air. It is characterized in that it corresponds to a part where the molten resin diverges by bypassing the mold part corresponding to the hole and joins in the cavity of the cylindrical part.

As described above, according to the cap according to the present invention, when the container is tilted, the content liquid flows into the inner region of the pouring tube from the pouring port at the bottom end of the pouring tube in the container, and the outer region of the pouring tube flows into the inner area of the pouring tube. It flows out of the cap through the opening of the pouring tube.

On the other hand, outside air flowing into the outer region of the pouring tube from the opening of the pouring tube above the liquid level in the pouring tube flows into the inner area of the pouring tube, and the air replacement hole located above the liquid surface of the flow rate adjusting unit. The content liquid flows into the container through the air, and the content liquid is smoothly poured out by air replacement between the content liquid and the outside air.

Therefore, in the structure in which the flow rate adjustment part is provided in the pouring tube, the pouring port for liquid passage and the air replacement hole for ventilation are provided as independent elements in the pouring tube. Area can be suppressed. That is, the conventional structure in which only the air replacement hole is provided and the air replacement hole has two functions of liquid flow and ventilation has a factor of increasing the opening area of the air replacement hole. However, by providing the outlet for liquid passage and the air replacement hole for ventilation as independent elements, it is sufficient to design the air replacement holes for the purpose of air replacement only, and the number and opening of the air replacement holes It becomes possible to suppress the area.

Restricting the number of air replacement holes and the opening area suppresses the occurrence of weld lines caused by the melted resin bypassing the mold parts corresponding to the air replacement holes during injection molding and then joining together.

Furthermore, by installing a rib that divides the opening of the air replacement hole into a plurality of parts in the circumferential direction of the pouring cylinder, the molten resin flows through the cavity of the rib of the mold during injection molding. As a result, the molten resin flowing out of the cavity of the rib flows into the meeting part where the molten resin bypassing the mold part of the air replacement hole flows in the opposite direction and joins, and the molten resin flows through the meeting part of the molten resin. push in the direction For this reason, the meeting angle becomes shallow when the molten resin joins at the meeting site, the joining of the molten resin becomes smooth, the occurrence of weld lines is suppressed, and the groove depth of the weld can be reduced.

FIG. 2 is a cross-sectional view of an open state of the cap according to the embodiment of the present invention; Sectional view of the closed state of the cap according to the same embodiment FIG. 2 is an upper perspective view of the cap according to the same embodiment in an open state; The top view of the unplugged state of the cap according to the same embodiment. FIG. 4 is a bottom perspective view of the cap according to the same embodiment in an open state; The side view of the opened state of the cap according to the same embodiment. The side view of the closed state of the cap according to the same embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of caps according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 7, the cap 1 is integrated with a cap body 4 attached to the mouth portion 3 of the container 2, and with the cap body 4 via a hinge 5 and a band 5a. It has a part 6. The entire cap 1 is made of resin.

The cap body 4 includes a body portion 41 surrounding the mouth portion 3 of the container 2 around the axis of the container 2 , a pouring tube 7 provided inside the body portion 41 , and an inner seal inserted into the mouth portion 3 of the container 2 . The portion 8 and the flow rate adjusting portion 9 provided inside the pouring cylinder 7 are integrally molded, and the fitting groove 10 is formed between the inner seal portion 8 and the main body portion 41 .

The body portion 41 is connected to the cap inner convex portion 12 that fits into the container outer recess portion 11 formed on the outer periphery of the mouth portion of the container 2, and to the outer peripheral surface of the pouring tube 7, and the inside of the body portion 41 is defined as the outer region. It has a pouring tube support portion 61 that partitions into an inner region.

The pouring tube 7 has a tubular portion 73 composed of an outer region 71 extending outwardly of the container and an inner region 72 extending inwardly of the container with the pouring tube support portion 61 as a boundary in the axial direction of the cap body 4 . , a bottom end portion 74 forming an inner end surface of the inner region 72 , and a spout 75 opening at the bottom end portion 74 .

The flow rate adjusting unit 9 includes an energy reducing plate 91 arranged in front of the outlet 75 in the axial direction of the container 2, and an energy reducing plate 91 extending from the periphery of the outlet 75 to the front of the outlet 75 in the axial direction of the container 2 to reduce the force. It consists of a plurality of support ribs 92 for holding the plate 91 , a plurality of openings 93 formed between the support ribs 92 , and an air replacement hole 94 formed in the inner region 72 of the pouring tube 7 .

The air replacement holes 94 are formed at a plurality of locations around the spout 75 along the axis of the cap body 4 . Although the relative positions of the air replacement holes 94 and the openings 93 can be set arbitrarily, here, each air replacement hole 94 is opposed to the opening 93 between the support ribs 92 in the radial direction of the pouring cylinder 7, and the pouring Air replacement can be efficiently performed at the time of unloading.

Each air replacement hole 94 opens from the bottom end 74 to the inner region 72 of the pouring tube 7, and has a rib 96 that divides the rectangular opening 95 of the air replacing hole 94 into a plurality of parts in the circumferential direction of the pouring tube 7. The rib 96 bridges between the opening edges of the openings 95 facing each other in the axial direction of the pouring cylinder 7 .

The rib 96 is arranged at a specific position of the air replacement hole 94, and this specific position is where the molten resin flowing from the cavity of the bottom end portion 74 of the pouring tube 7 to the cavity of the cylindrical portion 73 during injection molding is blown into the air replacement hole 94. , and the branched flows of the molten resin merge in the cavity of the cylindrical portion 73 .

Further, the cap 1 has a cylindrical outer shell 13 that forms a double wall with the cap main body 4 . It has a slit 14 that separates the cap main body 4 and the outer shell part 13 and has a thin internal/external connecting part 16 that connects the cap main body 4 and the outer shell part 13 .

The inner plug 18 that closes the opening of the dispensing tube 7 is separate from the upper lid portion 6 and the cap main body 4 before the upper lid portion 6 is folded at the hinge 5 . The inner plug 18 is incorporated into the upper lid section 6 by folding the upper lid section 6 at the hinge 5 with the inner plug 18 installed in the opening of the pouring cylinder 7 .

The upper lid portion 6 has a cylindrical inner plug holding portion 19 that holds the inner plug 18, and has an annular fitting projection portion 20 that protrudes radially inward along the inner peripheral edge of the upper lid portion 6. there is

The cap main body 4 has an annular upper lid holding portion 21 along the outer peripheral edge, and the upper lid holding portion 21 forms a shape that widens radially outward of the cap main body 4 obliquely upward. The upper lid holding portion 21 has a fitting surface 22 whose outer peripheral surface is recessed in an arc shape, and the fitting surface 22 is fitted to the fitting protrusion 20 of the upper lid portion 6 .

The upper lid portion 6 has a lock portion 23 at a position facing the hinge 5 in the radial direction of the mouth portion 3 of the container 2 , and the lock portion 23 is connected to the upper lid portion 6 via a lock portion score 24 . The cap body 4 has a stopper portion 25 that engages with a lock claw 23a formed on the lock portion 23 to prevent the upper lid portion 6 from opening. 26.

The operation of the above configuration will be described below. Before folding the upper lid part 6 , the inner plug 18 is installed in the opening of the pouring cylinder 7 , and the inner plug 18 is incorporated into the upper lid part 6 by folding the upper lid part 6 at the hinge 5 .

As shown in FIG. 1, when the upper lid portion 6 is folded, the inner plug holding portion 19 holds the inner plug 18, and the fitting projection portion 20 of the upper lid portion 6 fits into the upper lid holding portion 21 of the cap body 4. . Also, the lock portion 23 of the upper lid portion 6 enters the guard portion 26 and the lock claw 23 a engages with the stopper portion 25 .
(plugging)
By providing the thin internal/external connecting portion 16 that connects the cap main body 4 and the outer shell portion 13, the structure is such that the lower end of the cap main body 4 is not restrained by other members.

Therefore, when capping, the cap inner projection 12 slides on the outer peripheral surface of the mouth portion 3 of the container 2 in the axial direction of the mouth portion 3 and follows the shape of the outer peripheral surface of the mouth portion 3 of the container 2. When the mouth portion 3 moves in the radial direction, the lower portion of the cap body 4 connected to the outer shell portion 13 by the thin inner/outer connecting portion 16 expands easily in the radial direction without being constrained by other members. In addition, the capping work can be performed smoothly, and the force required for capping can be reduced.
(TE properties)
At the time of opening, the upper lid portion 6 is pushed up while the lock claw 23a is engaged with the stopper portion 25, and the lock portion score 24 of the lock portion 23 is broken. Therefore, the state in which the lock portion 23 is separated from the upper lid portion 6 of the container 2 on the display shelf or the like indicates a state of tampering, and the lock portion 23 is held in the holding space 27 to improve the TE property.

Since the shell part 13 protects the cap body 4, the cap 1 cannot be removed from the mouth part 3 of the container 2 by directly applying force to the cap body 4 by using a tool such as a bottle opener.
(at the time of pouring)
When the container 2 is tilted, the liquid inside the container 2 flows out from the pouring port 75 of the bottom end 74 of the pouring tube 7 in the axial direction of the pouring tube 7 and into the inner region 72 of the pouring tube 7 . At this time, the energy reducing plate 91 acts as a resistance to suppress the flow of the content liquid, thereby controlling the flow rate.

The content liquid whose flow is stopped by the force reducing plate 91 is diverted in the radial direction of the pouring tube 7 and passes through the opening 93 between the supporting ribs 92 to the inner region of the pouring tube 7. It hits the wall surface of 72 and flows out of the cap through the opening of the pouring tube 7 through the outer region 71 of the pouring tube 7 .

On the other hand, outside air flowing into the outer region 71 of the pouring tube 7 from the opening of the pouring tube 7 on the liquid surface inside the pouring tube 7 flows into the inner area 72 of the pouring tube 7, The content liquid flows into the container 2 through the air replacement holes 94 located on the surface, and the content liquid is smoothly discharged by air replacement between the content liquid and the outside air.

Therefore, in the structure in which the flow rate adjusting portion 9 is provided inside the pouring tube 7, the pouring port 75 for passing liquid and the air replacement hole 94 for venting are provided as independent elements in the pouring tube 7. , the opening area of the air replacement hole 94 can be suppressed.

That is, the conventional structure in which only the air replacement hole 94 is provided and the air replacement hole 94 has the two functions of liquid flow and ventilation has a factor of increasing the opening area of the air replacement hole 94 .

However, by providing the outlet 75 for liquid passage and the air replacement hole 94 for ventilation as independent elements, the air replacement hole 94 may be designed only for the purpose of air replacement. It becomes possible to suppress the number of installations and the opening area.

Restricting the number of air replacement holes 94 and the opening area of the air replacement holes 94 suppresses the occurrence of weld lines caused by molten resin bypassing the mold part corresponding to the air replacement holes 94 during injection molding and then joining together. Become.

Furthermore, in the present embodiment, the molten resin flows into the cavity of the force reducing plate 91 from the filling gate corresponding to the gate mark 100 left on the top surface of the force reducing plate 91 during injection molding, and passes through the cavity of the support rib 92. It flows into the cavity of the bottom end 74 and into the cavity of the pour tube 7 .

The molten resin that has flowed into the cavity of the pouring tube detours around the mold portion corresponding to the air replacement hole 94, flows in opposing directions, joins, and flows from the inner region to the outer region. A weld line is likely to occur at the meeting position of the molten resin, and the position above the air replacement hole 94 of the pouring tube 7 (≈outer region), that is, the inside of the pouring tube 7 that abuts on the inner plug 18 and exhibits the sealing function. A weld line on the peripheral surface causes leakage.

However, in this embodiment, the opening 95 of the air replacement hole 94 is provided with the rib 96 that divides the opening 95 into a plurality of parts in the circumferential direction of the pouring cylinder 7, so that the molten resin passes through the cavity corresponding to the rib 96. flow. The molten resin flowing through the cavities of the ribs 96 merges with the molten resin bypassing the mold portion corresponding to the air replacement hole 94 at the meeting position, pushing out the meeting portion of the molten resin in the flow direction of the molten resin. For this reason, the meeting angle becomes shallow when the molten resin joins at the meeting site, the joining of the molten resin becomes smooth, the occurrence of weld lines is suppressed, and the groove depth of the weld can be reduced.

1 Cap 2 Container 3 Mouth 4 Cap body 5 Hinge 5a Band 6 Top cover 7 Dispensing tube 8 Inner seal 9 Flow rate adjusting part 10 Fitting groove 11 Concave outside container 12 Convex inside cap 13 Outer shell 14 Slit 16 Connection inside and outside Part 18 Inner plug 19 Inner plug holding part 20 Fitting protrusion 21 Upper lid holding part 22 Fitting surface 23 Lock part 23a Lock claw 24 Lock part score 25 Stopper part 26 Guard part 41 Body part 61 Spitting pipe support part 71 Outer region 72 Inner region 73 Cylindrical portion 74 Bottom end 75 Spout 91 Energy reducing plate 92 Support rib 93 Opening 94 Air replacement hole 95 Opening 96 Rib 100 Gate mark

Claims (3)

Having a cap body to be attached to the mouth of the container,
The cap body is integrally molded with a main body surrounding the mouth of the container around the axis of the container, a pouring tube provided in the main body, and a flow rate adjusting part provided in the pouring tube,
The body portion has a pouring tube support portion connected to the outer peripheral surface of the pouring tube and dividing the inside of the main body portion into an outer area and an inner area,
The pouring tube has a tubular portion consisting of an outer region extending outward from the container and an inner region extending inwardly of the container with the pouring tube support portion as a boundary in the axial direction of the cap main body, and the interior of the inner region. having a bottom end forming an end face and a spout opening at the bottom end;
The flow rate adjusting portion includes a plurality of air replacement holes formed around the spout along the axial center of the cap body in the inner region of the spout tube, and a plurality of openings of the air replacement holes in the circumferential direction of the spout tube. A cap, characterized in that it has a rib that divides into two. 2. The cap according to claim 1, wherein the air replacement hole is formed in the inner region of the cylindrical portion. The rib is arranged at a specific position of the air replacement hole, and the specific position is a mold part corresponding to the air replacement hole where the molten resin flowing from the cavity at the bottom end of the pouring cylinder to the cavity of the cylindrical part during injection molding. 3. The cap according to claim 1 or 2, wherein the split flow of the molten resin merges in the cavity of the cylindrical portion.

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