JPH09188350A - Ejecting opening for liquid container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of an ejecting opening for liquid container by molding it simultaneously into a one-part structure and reducing quantity of resin. SOLUTION: An ejecting opening A for liquid container is formed of a two- color molding comprising a first part A1 formed of a propylene material and a second part A2 formed of a polyethylene material. The first part A1 forms an ejecting section 1 having a screwed section 1a, a blocking plate section 4 having an attaching plate section 2 and a thin line 3, and a connecting protrusion 5 having an irregular part 5a. Further, the second part A2 forms a cap top 6, a cap side wall section 7, and a cap connecting barrel part 8 which fills an inner peripheral area of the ejecting section 1 surrounded by the inner peripheral face of the ejecting section 1, the blocking plate section 4 and the connecting protrusion 5. By turning the second part, the blocking plate section 4 is chased at the thin line 3. Next, the second part A2 is separated from the first part A1 so as to make a cork openable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid container spout attached to a paper liquid container or the like.

[0002]

2. Description of the Related Art As a spout to be attached to a liquid container formed of a paper-based blank, for example, a liquid container made of paper containing liquor, milk, etc.
As disclosed in Japanese Unexamined Patent Publication (Kokai), it is a molded product of a thermoplastic resin, which can be easily opened by pulling a ring-shaped pull tab (also called a pull ring) and tearing it at the thin-walled portion, and separately molding it. It was general that the cap of the product was attached by screw fitting or the like.

[0003]

Since the conventional spout for liquid containers is composed of two parts, a spout main body and a cap, a set machine is required, two molding machines are required, and a pull ring is also required. Since the spout body needs to have a large dimension especially in the height direction, the amount of resin used is large and it is expensive, and even when opening, pull the pull ring that is difficult to pull after opening the cap and open it. There was a problem that it was twice as troublesome to do.

Therefore, it is an object to obtain a spout for a liquid container which can be opened in a single operation at a low cost, and it is an object of the present invention to solve this object.

[0005]

According to the present invention, a liquid container pouring spout can be simultaneously molded as a two-color molded product of a main body portion (first portion) and a cap portion (second portion), In addition, the closure plate can be opened by screwing at the same time as opening the plug without a pull ring. That is, the liquid container pouring outlet according to the present invention includes a tubular pouring portion having a screw portion on an outer peripheral surface thereof, a mounting plate portion continuously connected to a base end outer periphery of the pouring portion, and an inside of the pouring portion. The closing plate part provided in the vicinity of the mounting plate part with a ring-shaped thin wire recessed from the mounting plate part side, and protruding from the inside of the thin wire of the closing plate part to the tip side of the spout part to a predetermined height A first portion including a connecting protrusion having an uneven surface and a tip end surface of the pouring portion and an outer peripheral surface including a screw portion are covered without any gap, and an inner peripheral surface of the pouring portion, a closing plate portion, and a connecting portion. A second portion that fills the inner peripheral region of the pouring portion surrounded by the protrusions without a gap, and different thermoplastic resins are used for the first portion and the second portion, and two-color molding is performed. It is characterized by

As is known per se in the two-color molding, a thermoplastic resin is injected into a cavity formed by a primary molding female mold and a core mold to mold a primary molded product, and then the primary molding female mold is removed, Combine the secondary molding female mold and inject another resin,
This is a technology to obtain secondary molded products that are partially made of different materials.
The liquid container pouring spout of the present invention utilizes this two-color molding technique, and the first part on the spout body side and the second part on the cap side can be molded substantially simultaneously. In addition, since the first part and the second part are made of different materials, the adhesive force at the interface between them is not strong, and the first part and the second part are in a temporary attachment state, and the second part is opened in the opening direction. When turned, a shearing force is generated at the interface between the first portion and the second portion, and if the shearing force is larger than the adhesion force, they are separated. Further, before the first portion and the second portion are separated from each other at the interface, the closing plate portion is twisted at the thin wire portion to be in the opened state. In the closing plate portion, a connecting protrusion having an uneven surface is continuously provided on an inner portion of the thin wire, and the connecting protrusion is mechanically connected to the second portion. The stress does not occur between the portion and the second portion, and stress concentrates on the thin wire portion.
Therefore, when a force is applied in the opening direction, the thin wire portion is threaded before the first portion and the second portion are separated at the interface. Then, after the closing plate portion is screwed, the second portion is separated from the first portion while the portion of the closing plate portion that is threaded is attached, and the first portion is the spout body and the second portion. Is a cap, and it will be in the same state as when both are screwed,
It can be opened freely.

The liquid container spout according to the present invention has a one-part structure consisting of the spout body and the cap, so that a set machine is not required and only one molding machine is required, and simultaneous molding is possible. Since there is no pull ring, the height can be reduced and the amount of resin can be reduced. Therefore, the cost is low. Further, it can be opened at the same time as the cap is opened, and the openability is good. Further, since the molding is performed simultaneously, the adhesion at the time of closing the cap is good, and the contents do not leak.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a crushing section (a) in plan view and a crushing section (b) in front view of a spout for a liquid container according to the present invention, and FIG. 2 shows a perspective crushing section. In the figure, A is a spout for a liquid container which is a two-color molded product of a _first portion A ₁ made of polypropylene material and a second portion A ₂ made of polyethylene material.

In the first portion A ₁ , the tip end side (upper end side in the figure) is located at the base end side (lower end side in the figure) at a position close to the base end of the outer peripheral surface.
A cylindrical spout 1 having a stepped portion 1a having a smaller diameter and a screw portion 1b at a small diameter portion on the tip side of the stepped portion 1a, and an attachment continuous to the outer periphery of the base end of the spouted portion 1. Board 2
And a ring-shaped thin wire 3 provided inside the spout 1 near the mounting plate 2 along the inner diameter of the spout 1.
Is provided in the center of the closing plate portion 4 inside the closing plate portion 4 recessed from the side and the thin wire 3, and has a predetermined height to the tip end side of the pouring portion 1 (in the drawing, approximately 1/3 to the tip end side). The height of the corrugated protrusions and recesses 5 protrudes in a hollow cylindrical shape to the outer surface and has a corrugated portion 5 on the outer surface when viewed in a plan view.
The connecting protrusion 5 is formed with a.

The second portion A ₂ is a cap top portion 6 which covers the tip end surface of the pouring portion 1 and has a dish-shaped cutout portion 6a formed on the top surface, and the step portion on the outer peripheral surface of the pouring portion 1. A cap side wall portion 7 that covers a small-diameter portion closer to the tip end side than 1a, including the screw portion 1a, without gaps and is substantially flush with a large-diameter portion closer to the base end side than the step portion 1a
And the inner peripheral surface of the pouring portion 1, the closing plate portion 4 and the connecting protrusion portion 5
The cap connecting body portion 8 is formed so as to fill the inner peripheral region of the pouring portion 1 surrounded by the space without any gap.

In this liquid container pouring outlet A, polypropylene is injected into a cavity formed by a primary molding female mold and a core mold to mold a first portion A ₁ , and then the primary molding female mold is removed. It is obtained by combining the secondary molding female dies and injecting polyethylene into the cavity formed by the core mold and the secondary molding female dies to mold the second portion A ₂ .

In this way, the first part A ₁ and the second part A ₂ can be molded substantially simultaneously. Also, the first part A ₁
Since the one and the second portion A ₂ are made of polypropylene and the other is made of polyethylene, the adhesion between their interfaces is not strong. Then, when the second portion A ₂ is rotated in the opening direction, the connecting projection 5 is formed by the uneven portion 5a so that the second portion A ₂
Since it is mechanically coupled to the closing plate portion 4 of the first portion A ₁ , the closing plate portion 4 is threaded at the portion of the thin wire 3, and then the second portion is left attached with the portion of the closing blocking plate portion 4 that is threaded. A ₂ is first
Separated from part A ₁ . At that time, even at the screw portion 1b, the two are separated at the interface, and the two parts have the same shape as the spout of the tow parts in which the first portion A ₁ is the spout body and the second portion A ₂ is the cap. It can be opened freely by screw fitting.

The closing plate portion 4 of the _first portion A ₁ is
The shape of the connecting protrusion 5 mechanically connecting to the portion A ₂ of
Considering the shape of the primary molding female die, it is preferable to form the taper so that the diameter is reduced toward the tip side. However, the connecting projection 5 may be formed in an inverse taper shape so as to enhance the integrity with the second portion A ₂ , or a projection may be provided on the tip side.

Further, the first portion A ₁ and the second portion A ₂
As for the material, various combinations of materials are possible other than the combination of polypropylene and polyethylene.

[0016]

EFFECTS OF THE INVENTION According to the present invention, the liquid container spout can be simultaneously molded with a one-part structure, and
The amount of resin can be reduced, and the cost can be reduced. Further, the opening can be performed only once, and the liquid container pouring outlet without leakage of the contents can be obtained.

[Brief description of the drawings]

FIG. 1 is a fragmentary sectional view (a) in plan view and a fragmentary sectional view in front view of a liquid container spout according to an embodiment.

FIG. 2 is a perspective crushing cross-sectional view of a liquid container pouring spout showing an embodiment.

[Explanation of symbols]

1 Pour-out part 1b Screw part 2 Mounting plate part 3 Thin wire 4 Closing plate part 5 Connecting projection part 5a Uneven part 6 Cap top part 7 Cap side wall part 8 Cap connecting body part A Liquid container spout A ₁ First part A ₂ Second part

Claims (1)

[Claims] 1. A cylindrical spout part having a screw part on the outer peripheral surface thereof, a mounting plate part continuously provided on the outer circumference of the base end of the spout part, and an inside of the spout part of the mounting plate part. A closing plate portion provided in the vicinity and in which a ring-shaped thin wire is recessed from the mounting plate portion side,
A first portion formed of a connecting protrusion that is provided on the closing plate portion from the inside of the thin wire toward the tip side of the pouring portion to a predetermined height and has irregularities on the surface; a tip surface of the pouring portion; The outer peripheral surface including the screw portion is covered without a gap, and the inner peripheral surface of the pouring portion and a second portion that fills the inner peripheral area of the pouring portion surrounded by the closing plate portion and the connecting projection portion without a gap are formed. A spout for a liquid container, characterized in that different kinds of thermoplastic resins are used for the first portion and the second portion and two-color molding is performed.