JPH0420746Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a spout plug for liquid containers such as paper containers and back-in boxes, and particularly to a spout plug with excellent gas barrier properties.

(Prior art) Conventionally, liquid containers such as paper containers and back-in-box types have been equipped with spout stoppers as a means for pouring out the contents of milk, sake, juice, etc. In the case of foods that are stored for long periods of time, such as foods that are stored for long periods of time, perfect sealing is required. paper containers are used, and although the paper containers themselves have gas barrier properties,
The spout stopper attached to the opening of the container is generally a single injection molded piece of plastic, which allows gas to permeate through the spout stopper, which prevents the liquid from oxidizing and discoloring due to oxygen in the air. As a result, the product value was significantly reduced.

In addition, as a means to prevent gas permeation from the spout plug of this injection molding,
A spout plug disclosed in Japanese Patent No. 89871 is known.

As shown in FIGS. 2 to 9, this spout stopper (closing device) has a synthetic resin closing member provided at the container mouth with a mouth wall that shuts off the container mouth, and an endless wall on the mouth wall. A closure device for a container, comprising: forming a fissure, forming a tearing part inside the fissure, providing a tension ring on the tearing part, and adhering a metal foil to the mouth wall to cover the fissure. , metal foil prevents gas permeation from the spout plug.

(Problem to be solved) This conventional spout stopper uses aluminum foil with a synthetic resin film attached as the metal foil, but the end surface of the metal foil comes into contact with the contents inside the container. Therefore, there were restrictions on the contents, and there was a problem that contents that would corrode the aluminum foil could not be used.

(Means for Solving the Problems) The present invention solves the above problems, and in a spout plug having a flange portion attached to the opening of a container, the flange portion is formed on the lower edge of the cylindrical spout portion, A top wall portion is provided on the same plane as the bottom surface of the flange portion so as to close the pouring portion, and a thin wall portion for opening is formed in the top wall portion, and the top wall portion within this thin wall portion is formed on the top wall portion. A barrier film having a laminated structure including a tension ring and a synthetic resin layer on the liquid-contacted surface including aluminum foil extending from the back surface of the top wall part to the flange part is attached, and the peripheral edge of this barrier film is separated from the barrier film. This spout stopper is characterized by being covered with an annular synthetic resin film that reaches the flange.

(Function) Since the end face of the barrier film is covered with the synthetic resin film, the end face of the aluminum foil is protected and will not be corroded.

(Example) Below, a preferred example of this invention will be described based on the drawings.

FIG. 1 is a sectional view of the spout stopper A of the present invention, showing a state where it is attached to the opening of a paper container B containing aluminum foil A. This spout stopper A has a flange portion 1 attached to the periphery of the opening of a paper container B using a fixing means such as an ultrasonic seal, and a top wall portion 2 that closes the opening. A cylindrical spouting part 3 is projected upward, and a screw 4 for attaching a cap (not shown) is provided on the outer periphery of the spouting part 3. A thin wall portion 5 of a desired shape for opening is formed on the lower surface of the top wall portion 2, and a tension ring 6 is continuously provided within the thin wall portion 5. Furthermore, a barrier film 7 containing aluminum foil b is attached to the back surfaces of the flange portion 1 and the top wall portion 2 by heat welding or the like, and the peripheral edge of this barrier film 7 is covered with an annular synthetic resin film 8. .

Here, the barrier film 7 is one in which at least both sides of aluminum foil are laminated with synthetic resin layers, such as polyethylene c/aluminum foil b/polyethylene d, and the annular film is a polyethylene film punched out in an annular shape. It is preferable to use Here, the covering method is to weld the annular film 8 to the back surface of the flange portion 1 and the polyethylene b on the outside of the barrier film 7 by means such as heat sealing so that the end face of the aluminum foil b is not exposed.

Next, as for the opening method of the present invention, similarly to the conventional spout plug, the tension ring 6 is hung and pulled up as shown in FIG. Since the tear strength is low, the top wall portion 2 and the barrier film 7 are cut at the same time to form an opening e.

(Effects) As described above, in this invention, the barrier film is attached to the back surface of the top wall and flange, so gas permeation from the spout plug can be prevented, and the end surface of the barrier film is covered. This spout stopper is excellent in practical use, as it does not corrode metals such as aluminum foil, so there is no need to reduce the content of the liquid.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a preferred embodiment of the spout plug of the present invention, and FIG. 2 is a sectional view showing the opening of the spout plug. A...Spout stopper, B...Paper container, a, b...
Aluminum foil, c, d... polyethylene, 1... flange part, 2... top wall part, 3... pouring part, 5... thin wall part, 6... tension ring, 7... barrier film, 8... ...A circular film.

Claims (1)

[Scope of utility model registration request] In a spout stopper that has a flange that is attached to the opening of a container, the flange is formed at the lower edge of the cylindrical spout, and the top wall is attached to the lower surface of the flange so as to close off the spout. A thin-walled part for opening is formed on the top wall, a tension ring is continuously provided on the top surface of the top wall in this thin-walled part, and an aluminum plate extends from the back surface of the top wall to the flange. A barrier film having a laminated structure including foil and having a synthetic resin layer on the liquid contact surface is attached, and the peripheral edge of this barrier film is covered with a ring-shaped synthetic resin film that extends from the barrier film to the flange part. spout stopper.