JP7110809B2 - Spout plug and packaging container with spout plug - Google Patents

Description

The present invention relates to a spout plug and a packaging container provided with the spout plug.

2. Description of the Related Art Packaging containers provided with spout plugs are widely used as packaging containers for contents such as liquids. This spout plug comprises a plug body that is welded to the container body, and a cap that is screwed onto the plug body.

Patent Document 1 discloses a pouring device comprising a resin body to be welded to a paper container and a resin screw cap detachable from the body, wherein the body has a spout with a male screw formed on the outer circumference. and a closing plate provided inside the spout, and a pull ring provided on the closing plate. , a top plate and an inner ring.

Patent Document 1 describes that the pouring device can be manufactured by injection molding using a relatively soft synthetic resin such as polyethylene, and that the gate for injecting the resin when molding the main body is closed in the mold. It is described that it is provided at a location corresponding to the central portion of the plate.

Japanese Unexamined Patent Application Publication No. 2016-011128

The pouring device of Patent Document 1 is opened by inserting a finger into a pull ring provided in the pouring spout and pulling the pull ring to cut off the closing plate from the spout. In the method of maintaining sealing performance with a closing plate, it was difficult to open the package depending on the size of the pull ring provided on the closing plate, and it took time and effort to pull out the pull ring.

For this reason, a main body of a pouring device without a closing plate has been studied, but there is room for further investigation on the position and shape of the gate when the closing plate is removed. If the position and shape of the gate are not set appropriately, the flow of the resin material in the cavity will not be stable, and residual stress will occur inside the product, causing deformation such as sink marks and warpage. Are known. In particular, in the case of a product in which a large residual stress is generated, there is a problem that cracks are likely to occur at the position where the large residual stress is generated by ultrasonic welding.

INDUSTRIAL APPLICABILITY The present invention provides a spout plug and a spout plug capable of suppressing the occurrence of residual stress due to injection molding and the occurrence of deformation such as sink marks and warpage, even if the plug body is not provided with a closing plate. The object is to provide a packaging container comprising

One aspect of the present invention for solving the above problems is a cylindrical side wall, a flange extending outward from one end edge of the side wall, and a surface of the flange opposite to the side wall. A mouth having a plurality of recesses arranged concentrically and partitioned by ribs, and a gate port projecting from one of the recesses in the axial direction of the side wall to a position not exceeding the surface of the flange opposite to the side wall. A spout plug including a plug body and a cap sealing the plug body.

Another aspect of the present invention relates to a packaging container provided with the spout plug.

ADVANTAGE OF THE INVENTION According to the present invention, a spout plug and a spout that can suppress the occurrence of residual stress due to injection molding and the occurrence of deformation such as sink marks and warpage even in a configuration in which a closure plate is not provided on the spout body. A packaging container with an outlet plug can be realized.

Sectional view of spout plug according to the present embodiment A bottom view of the plug main body according to this embodiment. A perspective view of a packaging container provided with a spout plug according to the present embodiment.

(spout plug)
Embodiments of the present invention will be described below. FIG. 1 is a cross-sectional view of a spout plug according to this embodiment. FIG. 2 is a bottom view of the plug body. FIG. 3 is a perspective view of a packaging container provided with a spout plug according to this embodiment. 1 is a cross section taken along line BB' of FIG.

As shown in FIGS. 1 and 3, the outlet plug 1 includes a plug body 3 attached to a container body 2 by ultrasonic welding, and a plug body 3 attached to the plug body 3 to seal and seal the plug body 3. and a cap 4 capable of The cap 4 can be attached to the plug body 3 by screwing, for example.

(cap)
As an example, the cap 4 includes a top plate 5, a side wall 6 connected to the outer peripheral edge of the top plate 5 and having an inner screw 6a formed on the inner peripheral surface, and a cylindrical shape provided around the top plate 5. It has an inner ring 7 and a contact ring 8 provided between the side wall 6 of the top plate 5 and the inner ring 7 .

(Mouth plug body)
The plug body 3 has a cylindrical side wall 11 and a flange 17 extending outwardly from one edge of the side wall 11 . An outer thread 11a is formed on the outer peripheral surface of the side wall 11, for example. The plug main body 3 can be manufactured by injection molding using a resin material, which will be described later. The flange 17 serves as a joint when attaching the plug main body 3 to the container main body 2 .

As shown in FIGS. 1 and 2, on the surface of the flange 17 opposite to the side wall 11, a plurality of recesses 19 arranged concentrically with the side wall 11 in plan view and partitioned by ribs 18 are formed. there is For example, as shown in FIG. 1, the concave portion 19 may have a dome-shaped top surface and a tapered shape that widens toward the surface of the flange 17 opposite to the side wall 11 . By setting the angle θ (see FIG. 1) of the tapered surface to 50° or more and 70° or less, it is possible to suitably absorb vibrations in ultrasonic welding, which will be described later.

A gate opening 20 protrudes from one of the recesses 19 . The gate port 20 protrudes in the axial direction of the side wall 11 to a position not exceeding the surface of the flange 17 opposite to the side wall 11 . The gate port 20 is formed in a cylindrical shape as an example. The gate port 20 means a gate (entrance portion) of a cavity into which molten resin material is poured during injection molding.

As an example, the plug main body 3 and the container main body 2 are formed by overlapping the container main body 2, an anvil (not shown) as a receiving tool inserted inside the container main body 2, and the flange 17 of the plug main body 3. An ultrasonic horn (not shown) is placed on the container body 2 to generate ultrasonic vibrations, whereby welding can be performed. The vibration generated at this time is transmitted from the flange 17 to the side wall 11, but since part of the vibration is absorbed by the concave portion 19 and the rib 18, it is possible to prevent deformation of each part of the plug main body 3 due to the vibration. can.

By providing a gate at a position corresponding to the concave portion 19 of the mold used for injection molding the plug main body 3 , the gate opening 20 can be formed so as to protrude from the concave portion 19 . In addition, the resin material poured into the cavity from the gate can be simultaneously filled in the portions corresponding to the side wall 11 and the flange 17 of the cavity. As a result, the cavity can be uniformly filled with the resin material, so that the occurrence of residual stress and the occurrence of deformation such as sink marks and warpage can be suppressed. As a result, it is possible to suppress the occurrence of cracks due to ultrasonic welding.

Further, by providing the gate along the axial direction of the side wall 11 , the gate opening 20 can be formed so as to protrude in the axial direction of the side wall 11 . Furthermore, the resin material passing through the gate can be flowed linearly along the axial direction of the side wall 11 . As a result, the flow of the resin material in the cavity can be further stabilized, so that the occurrence of residual stress and deformation such as sink marks and warpage can be suppressed.

By protruding the gate opening 20 from the concave portion 19, the tip of the gate opening 20, which is difficult to uniformly fill with the resin material, can be formed so as to be positioned away from the flange 17, which is the propagation path of vibration. can. As a result, even if residual stress occurs at the tip of the gate port 20, the effect can be reduced by the force, and the occurrence of cracks can be suppressed.

Further, according to the plug main body 3, cracks due to ultrasonic welding can be suppressed, so welding can be performed with higher energy than usual. As a result, the welding strength can be increased and the time required for welding can be shortened.

The inner ring 7 of the cap 4 and the side wall 11 of the plug main body 3 are, as shown in FIG. You may form so that a surface may adhere|attach. By bringing the outer peripheral surface of the inner ring 7 and the inner peripheral surface of the plug main body 3 into close contact with each other, high sealing performance can be ensured even if the plug main body 3 is not provided with a closing plate.

Examples of the material of the plug main body 3 include low-density polyethylene and linear low-density polyethylene, and examples of the material of the cap 4 include polypropylene. It is not limited to these. The plug body 3 may be made of a material having lower rigidity than the cap 4 in order to increase the strength of adhesion between the plug body 3 and the cap 4 . Further, on the condition that the plug main body 3 is made of a material having lower rigidity (bending elastic modulus) than the cap 4, the bending elastic modulus of the material of the plug main body 3 is set to 100 MPa or more and 1200 MPa or less. The bending elastic modulus is preferably 1000 MPa or more and 2100 MPa or less.

The spout plug and the packaging container provided with the spout plug according to the present invention are suitably used, for example, as a spout plug provided on a packaging container containing a content such as a liquid or a packaging container provided with the spout plug.

1 spout plug 2 container main body 3 spout main body 4 cap 5 top plate 6 side wall 6a internal screw 7 inner ring 8 contact ring 11 side wall 11a external screw 17 flange 18 rib 19 recess 20 gate port

Claims (2)

a cylindrical side wall;
a flange extending outwardly from one edge of the side wall;
a plurality of recesses arranged on a concentric circle of the side wall in a plan view and partitioned by ribs on a surface of the flange opposite to the side wall;
a plug main body including a gate opening protruding from one of the recesses in the axial direction of the side wall to a position not exceeding a surface of the flange opposite to the side wall;
and a cap that seals the plug body. A packaging container comprising the spout plug according to claim 1 .

Images