JPS62242526A - Method of sealing paper-vessel spout - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for attaching and sealing a spout to a paper container containing contents such as milk, juice, alcoholic beverages, and other soft drinks.

[Conventional technology]

Paper containers, which are replacing traditional bottles as containers for beverage liquids, are made by assembling the paper container from cartons as its raw material, filling it with contents and sealing it to create a product. It has become popular in recent years because it can reduce production costs and also allows the container to be easily crushed and disposed of after use. Furthermore, when using this paper container, in order to facilitate pouring out the contents and improve sealing performance after opening,
It is common practice to attach a spout to the wall of the head of a paper container.

FIG. 4 shows a commonly manufactured paper container. A pair of sloped surfaces are formed on the head of the paper container 1, and on one side of the sloped surface there is a pouring spout 2A as shown in FIG. and circular top 2 II
A spout 2 having a spout 2 is attached. In order to install the spout 2 in this way, during the assembly of the paper container l, the spout 2A of the spout [12] is made to protrude from the inside of the wall surface into a hole formed in the paper container l, and the spout part 2A of the spout [12] is projected from the inside of the wall surface and the brim portion 2B is connected to the paper container wall surface. and a circular tail portion 2 that surrounds the spout portion 2A.
This is done by resealing along the outer periphery of B using an ultrasonic seal or the like.

[Problem that the invention seeks to solve]

Recently, the applicant has developed a spout 2 which has a special opening shape and therefore requires the spout 2 to be attached to the paper container 1 in a predetermined direction. For such a spout where the installation direction must be restricted, it is difficult to install a spout with a circular brim as shown in Fig. 5, and a straight flange as shown in Fig. 6 is difficult to install. A non-circular tail portion 2D with a guide edge 2C is adopted. However, when attaching this collar portion 2D to the paper container l,
When sealing was performed in an annular manner surrounding the spout 2A as in the past, it was found that the ninth problem occurred. That is,
When aseptically filling the contents into a paper container with a spout, the paper container and the spout are sterilized by spraying a sterilizing solution on the paper container and spout in a sterile chamber. There is a non-sealed portion 2F on the outside of 2E (shown by hunting in FIG. 6).

There is a small gap between the tail of this part and the wall of the paper container that allows it to pass through the container, so the sterilizing solution cannot reach a sufficient size in this gap, resulting in poor sterilization or entering the container. Even after the drying operation, the sterilizing liquid did not dry sufficiently and remained as it was, and after filling the contents, it flowed out into the contents, causing problems such as clogging.

The present invention has been made in view of the problems encountered when using a new spout as shown in FIG. To provide a method for sealing a spout, which enables reliable sterilization even when the spout is attached to a paper container, and prevents troubles such as mixing of sterilizing liquid into the filling.

[Means for solving problems]

The present invention achieves the above-mentioned object, and the flange portion of a spout having a spout portion and a flange portion partially having a non-circular outer circumference,
The brim is pressed against the wall of the paper container to seal the brim and the paper container in an annular shape surrounding the spout, and the brim and the paper container are sealed along the outer periphery of the brim. The main points are how to seal the paper container and the spout of the container.

[Effect]

As described above, according to the present invention, the brim and the wall surface of the paper container are sealed in an annular shape surrounding the spout, so even if the mounting angle of the spout deviates from a predetermined angle when installing the spout, the annular shape The seal can be done reliably.

The periphery of the spout is reliably sealed to the wall surface of the paper container, and the inside and outside of the paper container are reliably sealed. Furthermore, since the brim and the paper container are sealed along the outer periphery of the brim, even if there is a gap between the brim and the wall of the paper container due to an unsealed area, the gap will be closed. Since it is closed by a seal along the outer periphery of the brim and does not lead into the inside of the paper container, problems such as poor sterilization or sterilizing liquid entering and remaining and flowing out after filling will not occur.

〔Example〕

The present invention will be described in detail below with reference to one drawing.

FIG. 1 is a sectional view showing a state in which a spout is attached to the wall surface of a paper container and sealed. In the figure, reference numeral 4 indicates a wall plate having a resin layer on the surface constituting the paper container', and reference numeral 5 indicates a resin spout. This spout 5 has the same shape as the spout 2 shown in FIG. 6, and has a spout portion 5A and a flange portion 5B, and a camp 5C is attached to the spout portion 5A. As shown in FIG. 3, the flange portion 5B is non-circular with one side square and the other side circular.

Its outer periphery is composed of straight portions 5a, 5b and one circular arc portion 5c. In FIG. 1, 6 is an ultrasonic horn for sealing, and 7 is an anvil. As shown in FIG. 2, the end face of the ultrasonic horn 6 has an annular sealing surface 6A and an outer peripheral sealing surface 6B located on the outside thereof, and the annular sealing surface 6A is connected to the spout of the spout 5. It surrounds the portion 5A and has the same outer diameter as the arc portion 5G of the collar portion 5B.

The outer peripheral sealing surface 6B has a shape along the straight portions 5a and 5b of the portion 5B. Note that the contact portion between the annular sealing surface 6A and the outer sealing surface 6B is coated with a minute amount of 1, for example, 0.51.
A gap 8 of approximately 2 is formed. This gap 8.

If the annular seal surface 6A and the outer peripheral seal surface 6B are integrated, the seal area of this part will increase significantly due to processing constraints, and the heat generation per unit area will decrease, causing problems with other seals. It is something that A relief for the cap 5C of the spout 5 is formed inside the ultrasonic horn 6, and the inner surface thereof has a tapered surface 9.

This tapered surface 9 is for guiding the camp 5C of the spout 5 and positioning the ultrasonic horn 6 at a predetermined position relative to the spout 5.

Next, a sealing method using the above ultrasonic horn will be explained. During the assembly of the paper container, a hole in the wall plate 4 was inserted.

The spout 5 is inserted in the state shown in FIG. At this time.

The flange portion 5B of the spout 5 utilizes its straight portion 5a.

Always facing a certain direction. In this state, the lower surface of the collar 5B is supported by the anvil 7, and the ultrasonic horn 6 is pressed from above the wall plate 4 to ultrasonically seal the collar 5B of the spout 5 and the wall plate 4. As a result of this sealing operation, as shown by hatching in FIG. 3, an annular seal portion lO surrounding the spout portion and an outer peripheral seal portion 11 along the outer periphery of the rectangular portion of the collar portion 5B are formed. At this time, a minute gap 8 is formed between the sealing surfaces 6A and 6B of the ultrasonic horn 6, but since the gap 8 is small, when ultrasonically sealing the wall plate 4 and the collar portion 5B, This portion is also melted and sealed, so that the unsealed portion 12 shown in FIG. 3 is reliably sealed around it. In this way, the spout 5 is sealed to the wall plate 4 of the paper container by the annular seal portion lO surrounding it and the outer seal portion 11, so that the inside and outside of the paper container are reliably sealed, and the outer seal portion 11
Since the non-sealed part 12 is isolated from the inside of the paper container, there is no chance of sterilizing liquid remaining or leaking into the contents due to this non-sealed part 12.
This prevents staining and the occurrence of unsterilized areas.

Here, when attaching and sealing the spout, the mounting angle of the flange portion 5B of the spout 5 may be slightly deviated. However, even in that case, since the seal portion lO shaped like [] is necessarily formed, the area around the spout is reliably sealed, and leakage inside and outside the paper container is reliably prevented. In addition, in installing the pouring spout, since it is most important to prevent leakage inside and outside the paper container, by forming the seal portion 11 on the outer periphery.

It is preferable that the formation of the outer peripheral seal part 11 be weaker than the formation of the annular seal part 10 so that the formation of the annular seal part 10 surrounding the spout part 5A is not hindered.

〔Effect of the invention〕

As is clear from the above description, when attaching a spout having a spout portion and a flange portion having a partially non-circular outer periphery to a paper container, the present invention provides an annular shape surrounding the spout portion.
Since the brim portion and the paper container are sealed together, and the brim portion and the paper container are sealed along the outer periphery of the brim portion, even if the mounting angle of the spout is The annular seal can be reliably formed even if it deviates from a predetermined angle, the area around the spout is reliably sealed to the wall of the paper container, the inside and outside of the paper container are reliably sealed, and furthermore,
Since the brim and the paper container are sealed along the outer circumference of the brim, even if there is a gap between the brim and the wall of the paper container due to an unsealed area.

The gap is closed by a seal along the outer periphery of the brim and does not pass into the paper container, which may result in poor sterilization, or the sterilizing solution may get in and remain and mix with the contents after filling. It has the effect of not contaminating things.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the process of sealing according to the method of the present invention. 2 is an end view of the ultrasonic horn 6 shown in FIG. 1, and FIG. 3 is a plan view showing an example of the spout sealed by the method of the present invention.
FIG. 4 is a perspective view of a general paper container, FIG. 5 is a perspective view of a spout used in the paper container, and FIG. 6 is a perspective view of a new spout.

Claims (2)

[Claims] (1) Press the brim of a spout having a spout and a brim partially having a non-circular outer periphery against the wall surface of the paper container, and press the brim and the paper container in an annular shape surrounding the spout. 1. A method of sealing a spout for a paper container, the method comprising: sealing the flange and the paper container along the outer periphery of the flange. (2) The sealing between the brim portion and the paper container is performed by an ultrasonic horn having an annular sealing surface and an outer peripheral sealing surface, with a minute gap provided at a contact point between the two. A method for sealing a spout of a paper container according to Scope 1.