JPS61164939A - Manufacture of sealing vessel with vessel drum made of paper - 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 manufacturing a pressure-resistant sealed container used for beverage cans and the like using a paper container body and a metal lid.

, (Prior Art) In recent years, liquid-sealed containers using paper container bodies made of composites have been widely used due to resource conservation and waste disposal issues. For this type of product, as shown in the third diagram, the metal lid a
There is a type in which the metal can body is attached to a container body, and its manufacturing method is performed by double-sealing the opening edge of the container 111b in the same way as conventional metal can bodies. However, paper container shells differ from metal shells in that they have a lack of elasticity, so when they are tightened, the folded part d of the folded flange part C hardens, and the metal lid a
The seaming wall part e and the chuck wall part "are compressed and hardened in the dark, and if the pressure inside the container body is high, this folded part d or the seaming wall part e and the chuck wall part f The compressed part would break and the metal lid would come off.As a result,
It could not be used as a container for carbonated beverages that require pressure resistance of 10 to 9/Cd.

On the other hand, the peripheral edge of the metal lid is fitted to the outer peripheral surface of the opening of the metal container body instead of the paper container body, and the outer peripheral surface and the inner surface of the peripheral edge of the metal lid are heated to melt and cool the adhesive. A method for manufacturing a metal container to be bonded is disclosed in JP-A-58-61936. However, when such a manufacturing method is adopted for paper container bodies, the opening edge of the paper container body is exposed inside the container, so it is constantly in contact with the liquid stored in the container, and the liquid is exposed to the inside of the container. This was unsuitable because it penetrated into the paper structure of the container body through the opening edge and swelled, causing delamination and weakening the adhesive part of the container body.

(Problems to be Solved by the Invention) The present invention solves this problem by providing a neck-in portion at the opening of the container body covered with a reinforcing member, so that the container body can be maintained even if the internal pressure is constantly high. The present invention aims to provide a method for manufacturing a sealed container having a paper container body in which the joint portion between the container and the metal lid is strong and has excellent pressure resistance.

(Means for Solving the Problems) The present invention solves the above-mentioned problems, and includes an outer reinforcing portion, an inner reinforcing portion, and a connecting portion at the opening of a paper container body whose inner surface is waterproofed. a step of covering and mounting a reinforcing member of a cylindrical body with a cross section of approximately n-shape over the entire circumference of the opening; and a step of covering and mounting a reinforcing member on the opening of the container body to the outer circumferential surface of the container shell and the surface of the reinforcing member. A step of squeezing the container body together with the reinforcing member by press-fitting it into the groove of the barrel crimping mold, which has an abutting groove with a generally reverse concave cross section, and heating the container body and the reinforcing member to fit the container into the opening of the container body. a step of forming a neck-in portion having a smaller diameter than the body;
A step of adhering a reinforcing member to the opening of the container body, and a step of fitting the peripheral wall portion of the metal lid, which is composed of a panel portion and a peripheral wall portion connected thereto, to the outer surface of the opening of the container body via the reinforcing member. and a step of bonding the peripheral wall portion of the metal lid to the reinforcing member, so that the outer peripheral surface of the peripheral wall portion of the metal lid is disposed on the same plane as the outer peripheral surface of the container body or on the inner side.

(Example) FIGS. 1A to 1D show an example of the manufacturing process of the sealed container of the present invention.

First, each member of the sealed container used in carrying out the present invention, namely the container body (1), the reinforcing member (4), and the metal lid (5).
) will be explained.

Container Jlii (1) is made of paper and is a conventional composite container body such as a spiral, combo lute, or single wall, and is a cylindrical body with an opening.
Its cross section may be of any shape, such as circular or square. The inner and outer surfaces of the container body (1) are made of metal ion-crosslinked polyolefin resin (ionomer resin), polyolene resin containing polar groups such as carboxyl groups, and other materials that have good thermal adhesion to metals. The container body (1) was waterproofed by coating the resin film (3) or adhering aluminum foil to the inner and outer surfaces, and then coating the synthetic resin film on the front side. The reinforcing member (4) is made of a synthetic resin that is the same as or compatible with the synthetic resin coating (3), and covers the entire circumference of the opening (2) of the container body (1). 2b) side to the end face (
2c) and further to the outside 1ffi (2a) side. Each surface (2a) (2b) (2c) consists of an outer reinforcing part (4a) coated with gold, an inner reinforcing part (4b), and a connecting part (4C). It has an approximately n-shaped cross section and a cylindrical overall shape. The open end side of the reinforcing member (4), that is, the lower end portion of the outer reinforcing part (4a) has an inclined surface (4) extending downward from the inside to the outside.
d), a similar inclined surface (4e) is provided at the lower end of the inner reinforcing part (4b), and the inner reinforcing part (4b) is extended from the upper end to the lower end so that the lower end becomes the thick part (4''). It is configured in a shape with an inclined part (4g) that extends over the area, and further includes a connecting part (4g).
4c) was configured into a curved shape.

The metal lid (5) is made of aluminum or a metal material coated with aluminum, and the panel part (6)
and a cup-shaped bottomed peripheral wall part (7) which extends to the peripheral edge part and is exposed on the outer surface (2a) side of the opening (2a) of the container body (1) in a state of hanging down with respect to the panel part (6). It is a cylindrical body, and the inner surface of the metal lid (5) is coated with the above-mentioned heat-adhesive synthetic resin coating (8).

Next, a method for manufacturing a sealed container will be explained with reference to the drawings.

First, as shown in FIG. 1A, the open end of the reinforcing member (4) is made so that the outer reinforcing part (4a) of the reinforcing member (4) comes into contact with the outer surface (2a) of the opening (2a) of the container body (1). Insert the reinforcing member (4) into the opening (2) from the end face (2C) side of the opening (2).
) is covered.

In addition, a double inclined surface (4d) (4) is provided on the open end side of the reinforcing member (4).
e) is provided, this serves as a guide to the opening (
Since it is easy to apply the coating to h, the installation process is simple and productivity is high. Next, as shown in FIG. 1B, the body crimping mold (2) used in this step is in contact with the outer circumferential surface (9) of the container body and the surface of the reinforcing member (4), and has a cross section that corresponds to the entire circumference of the opening (2). A concave groove (2) is provided in which the heating device is incorporated, and a reinforcing member (4) is inserted into the opening (h) of the container body (1) in the groove of the body crimping type (3). If it is inserted from the connecting part (4C) side of the covered part, the outer reinforcing part (4a) of the reinforcing member (4) will press inward of the container body (1) along the outer surface (22a) of the groove (2). When the covered part is pressed into the groove, the outer circumferential surface of the container body (9)
The outer reinforcing part (4a) of the reinforcing member (4) is on the outer surface (22a) of the groove ■, and the connecting part (4c) of the reinforcing member (4) is on the inner surface (22c) of the groove ■. ) internal reinforcement part (4
b) are in contact with the inner surfaces (22b) of the grooves (22b), respectively, and the reinforcing member (4) is in a pinched state when the reinforcing member (4) is in contact with the inner surface (22b) of the groove (2). ) is squeezed inward to reduce the diameter of the outer circumferential surface of the reinforcing member (4) by the thickness of the metal lid (5) from the outer circumferential surface of the container body (9). Then, the narrowed opening and the reinforcing member (4) are heated by a heating device built into the body crimping mold ■, and are fixed in a reduced diameter state to avoid softening, so that the narrowed opening and the reinforcing member (4) are heated and fixed in a reduced diameter state from the outer circumferential surface of the container body (9). (IO) is formed in the opening (2) of the container body (1).

Subsequently, the coating (3) applied to the inner and outer surfaces of the opening of the container body (1) and the reinforcing member (4) are melted and bonded together.

In addition, the above-mentioned number 1! (3) and the reinforcing member (4) may be bonded together at the same time as the formation of the neck-in portion aG.

In addition, the inner reinforcing part (4b) of the reinforcing member (4) has a thick wall part (4f) at the lower end and an inclined part (4g) extending from the upper end to the lower end. (4a)
The neck-in portion (+1) can be reliably and easily formed by being recessed inwardly along the inclined surface (4d) at the lower end.

In addition, the container body (1) and the reinforcing member (4) are reduced in diameter to open the opening (
The body crimping mold (2) used to form the neck-in portion aO in 2) may be an integral mold with the groove (2) of the above-mentioned structure provided directly, or the groove (2) may be formed by forming the groove (2) as shown in Fig. 1B. Outer surface (22
a) and the inner surface (22) of the groove (2).
b) and a crimp inner mold (212) having a back surface (22c)
It is also possible to integrate the divided molds, each of which has been made in advance, by an appropriate means and use this as the body crimping mold (2) having the grooves as described above.

Subsequently, as shown in FIG. 1C, in the previous step, the metal lid (5) is fitted onto the reinforcing member (4) which is covered over the opening (h) of the container body (1), and the outer surface of the opening (2) is (2a) side has a metal lid (5
) are fitted with the inner surfaces of the peripheral wall (υ) via the reinforcing member (4).

In addition, if an outwardly curved part 0 is provided at the lower end of the peripheral wall part (υ) of the metal lid (5) as shown in FIG. 4) Metal lid to (5)
) can be easily fitted externally, resulting in high productivity.

Further, since the connecting portion (4c) of the reinforcing member (4) is configured in a curved shape, the efficiency of the above-mentioned external fitting process is further improved.

Next, as shown in the first diagram, the reinforcing member (4) and the metal lid (5) are attached.
The mold surface (24a) of the lid crimping mold [phase] incorporating a heating device (2) is brought into contact with and pressed on the outer fitting part of the metal lid (5), and the peripheral wall (D and reinforcing member (4) is heated, and a coating (
8) are melted and bonded together. In addition, the reinforcing member (4
) and the peripheral wall (7) of the metal lid (5) may be replaced with the above-mentioned method and may be bonded together using an adhesive.

In addition, when using a metal lid (5) provided with a curved portion (Iv) at the lower end portion of the peripheral wall portion (7), the outer periphery of the curved portion (It) is simultaneously pressed by the lid pressure spring type [phase]. Surface and peripheral wall outer peripheral surface (
+21 and press so that they are on the same plane. In addition, the heating device 123QS is incorporated into the body compression type ■ and the lid compression spring type @.
There are high-frequency induction heating devices, electric heating devices, and hot air devices, which are selected depending on the size and shape of the sealed container.

Through the above steps, metal is formed as shown in Figures 1 and 2. (
A sealed container is manufactured in which the outer circumferential surface a of the peripheral wall portion of ω is disposed on the same plane or inwardly as the outer circumferential surface (9) of the container body. Then, the end face (2C) of the opening (2) of the container body (1) is isolated from the contents, and the liquid permeates through the end face (2C) of the container body (
1), and prevents the joint between the container body (1) and metal lid (5) from being destroyed by contents that generate high internal pressure, improving pressure resistance and sealing performance. Get a container.

(Effects of the Invention) As described above, according to the present invention, the opening of the paper container body whose inner surface is waterproofed has an approximately n-shaped cross section consisting of an outer reinforcing part, an inner reinforcing part, and a connecting part. A step of covering the reinforcing member of the cylindrical body over the entire circumference, and a process of covering the opening of the container body with the reinforcing member and having a substantially inverted concave cross section in which the part where the reinforcing member is covered and mounted on the opening of the container body comes into contact with the outer peripheral surface of the container body and the surface of the reinforcing member. A step of squeezing the container body together with a reinforcing member by press-fitting it into the groove of a cylinder crimping mold provided with a groove, and heating the container body and the reinforcing member to form a neck-in portion with a smaller diameter than the container body at the opening of the container body. a process of bonding a reinforcing member to the opening of the container body; and a process of bonding the reinforcing member to the opening of the container body, and bonding the peripheral wall of the gold B lid, which is composed of a panel part and a peripheral wall part connected to the panel part on the outer surface side of the opening of the container body, through the reinforcing member. a step of fitting the
Manufacturing a sealed container having a paper container body by arranging the outer peripheral surface of the peripheral wall of the metal lid on the same plane or inwardly as the outer peripheral surface of the container body through the step of bonding the peripheral wall portion of the metal lid and the reinforcing member. do.

Therefore, by press-fitting the reinforcing member covering the opening of the container body into the groove of the cylinder crimping mold, the reinforcing member and the container body are brought into a reduced diameter state at the same time, and then fixed in the reduced diameter state by heating. A neck-in part can be easily formed at the opening, and since the opening of the container body is covered with a reinforcing member, there is no damage to the container body when the metal lid is fitted and pressure bonded to the opening. The end faces of the container are also coated to prevent weakening from the end faces. Therefore, the joint between the container body and the metal lid is strong and has excellent pressure resistance and sealing properties.Furthermore, since a neck-in part is formed at the opening, the outer peripheral surface of the container It is possible to continuously and efficiently manufacture sealed containers that have no irregularities on their tops and are easy to align and arrange.

[Brief explanation of drawings]

FIG. 1 is a scale diagram for explaining an example of the manufacturing process of the present invention, and FIG. 2 is a sealed container obtained by the manufacturing method of the present invention.
FIG. 3 is a partially cutaway side view showing one example of the conventional product. (1) Container body (2) Opening (4) Reinforcement member (4a) External reinforcement (4b) Internal reinforcement (4C) Connection (5)... Gold i-lid (6)... Panel part (7)... Peripheral wall part (9)... Container body outer peripheral surface (IO... Neck-in part (+21... Surrounding wall part) Outer circumferential surface ■...Top crimped type...Groove procedure amendment [l]6141・Poor 8B

Claims (1)

[Claims] A cylindrical reinforcing member with an approximately ■-shaped cross section, consisting of an outer reinforcing part, an inner reinforcing part, and a connecting part, covering the entire circumference of the opening is attached to the opening of a paper container body whose inner surface has been waterproofed. In the process, the part of the opening of the container body covered with the reinforcing member is press-fitted into the groove of the barrel crimping type, which has a groove with a substantially reverse concave cross section that contacts the outer circumferential surface of the container body and the surface of the reinforcing member. a step of heating the container body and the reinforcing member to form a neck-in portion with a smaller diameter than the container body at the opening of the container body; and a step of applying the reinforcing member to the opening of the container body. a step of adhering, a step of fitting the peripheral wall portion of the metal lid consisting of a panel portion and a peripheral wall portion connected thereto to the outer surface side of the opening of the container body through a reinforcing member, and a step of fitting the peripheral wall portion of the metal lid and the reinforcing member. A method for manufacturing a sealed container having a paper container body, characterized in that the outer circumferential surface of the peripheral wall of the metal lid is disposed on the same plane as the outer circumferential surface of the container body or on the inner side by a step of adhering the metal lid to the outer circumferential surface of the container body.