JPS6264534A - Manufacture for shoulder of laminated tube - Google Patents

Abstract

PURPOSE:To fulfil high barrier properties of a laminated tube over a long term and to prevent its contents from being altered by a method wherein a barrier disc having a cylinder part, a cap part and a shoulder part is molded using an aluminum foil, an inner layer resin disc having a cylinder part and a shoulder part is molded using a synthetic resin, the barrier disc is fitted on the inner layer resin disc to be bonded, and an outer layer disc is integrally molded. CONSTITUTION:A barrier disc 10 having a cylindrical cylinder part 11, a shoulder part 12 to be extended in a cone form from the open end on one side of the cylinder part 11 and a cap part 13 to close the open end on the other side is molded by a draw processing using one sheet of an aluminum foil. Separately from this, an inner layer resin disc 20 having a cylindrical cylinder part 21 and a shoulder 22 to be extended in a cone form from the open end on one side of the cylinder part 21 is molded using a synthetic resin. The barrier disc 10 is fitted on the inner layer resin disc 20 to be bonded. A cylindrical cylinder part 31 and an outer layer resin disc 30 having a shoulder part 32 to be extended in a cone form from the open end on one side of the cylinder part 31 is integrally molded outside the barrier disc 10 using a synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a shoulder of a laminate tube.

(Prior Art) The shoulder of a conventional laminate tube has a cylindrical part (2) made of synthetic resin with an opening (4) as shown in Fig. 4;
A shoulder body (1) consisting of a cone-shaped shoulder (3) extending from the cylindrical part (2) is formed, and apart from this shoulder body (1), it has a barrier property as shown in FIG. It is manufactured by molding a cone-shaped barrier disk (5) from synthetic resin, and fitting and gluing this barrier disk (5) onto the shoulder part (3) of the shoulder body (1), and is usually formed in this way. The shoulder body (1) is high-frequency welded to the tube body (B), and the opening of the cylindrical part (2) (
4) is sealed with aluminum foil (not shown), and a synthetic resin cap (not shown) is fitted onto the cylindrical portion (2).

(Problems to be Solved by the Invention) However, in the above-mentioned shoulder, the shoulder part (3) of the shoulder body (1) is connected to the barrier disk (5), and the cylindrical part (2) is connected to the cap. Due to the two-layer structure, the opening (4) of the cylindrical part (2) secures barrier properties with aluminum foil, but in this way, the opening (4)
The work of pasting aluminum foil to seal the parts is done after the molding work of each part is completed, which not only adds extra work to the funeral, but is also extremely complicated and time-consuming.

Moreover, the shoulder body (1), the barrier disk (
5) and the cap, which are both made of synthetic resin, deteriorate over time, causing the barrier properties to be lost in a very short period of time, and the contents to be deteriorated.

(Means for Solving the Problems) The present invention aims to solve the problems as described below. While molding a barrier disk having a shoulder portion extending in a cone shape from the other open end of the cylindrical portion, the cylindrical portion and the shoulder portion extending in a cone shape from the open end of the cylindrical portion are molded using synthetic resin. A barrier disk is fitted onto the inner resin disk and adhered thereto, and then an outer resin disk is integrally molded on the outside of the barrier disk. Function) [-The shoulder manufactured by the method described above has a barrier disk interposed between the inner layer resin disk and the outer layer resin disk, and this barrier disk is made of aluminum foil and does not change over time and can be used for a long period of time. It has a high barrier property, especially in the shoulder part as well as the cylindrical part, and it shows a high barrier property for a long time.Also, aluminum foil is provided on the opening end of the shoulder part, and this opening Even if the synthetic resin cap that is fitted to the opening deteriorates, the barrier properties will not be compromised, and there is no need for extra and complicated work such as pasting aluminum foil on the opening end of the mouth after the molding process. .

(Example) The method of the present invention will be explained in detail below based on illustrative drawings.

First, using a sheet of aluminum foil, attach a cylindrical tube part (!I), a shoulder part (12) extending in a cone shape from one front end of the tube part (11), and the other side of the tube part (11). A barrier disk (10) having a lid RB (+3) that closes the open end is formed by drawing.

Separately, a synthetic resin such as polyethylene resin is used to connect a cylindrical tube portion (21) and a shoulder portion (22) extending cone-shaped from one end between one side of the tube portion (21). An inner layer resin disk (20) is molded.

Next, the barrier disk (10) is fitted and bonded to the inner layer resin disk (2ON-).

Thereafter, an outer resin disk (32) having a cylindrical tube part (3) and a cone-shaped shoulder part (32) extending from one front end of the tube part (3I) using a synthetic resin such as polyethylene resin ( 30) is integrally molded on the outside of the barrier disk (■0) as described above. This outer layer resin disk (30) is
The other open end of the cylinder part (3I) is an opening [1] through which the contents flow out.
(33), and a stepped recess (34) is formed at the same time on the outer edge of the shoulder (32).

The shoulder (A) thus produced by the method described in -1 is high-frequency welded to the tube body (B), that is, the outer resin disk (30) in the shoulder (A) is welded to the tube body (B).
The concave ffl<(:114) of the foreign tube body (B) is inserted and welded and joined by high frequency heating. A synthetic resin camp (not shown) is fitted into the cylindrical portion (3I) of the disk (30), and the tube body C
B) Fill the inside with appropriate products from the rear end and seal it.

The tube body (B) in the above-mentioned embodiments includes, for example, as shown in FIG.
1) and an outer cylinder (42) made of a strong and highly chemical-resistant synthetic resin such as polypropylene resin, and the inner and outer cylinders (2) are formed on both sides of the intermediate cylinder (3). In contrast to (3), an adhesive layer (41aH41b) with high adhesiveness is provided.

Therefore, the tube body (B) has a square inner cylinder (40).
is extruded, and then adhesive layers (41a) (4) are applied on both sides.
1b) is wrapped around the outer periphery of the inner cylinder (40), and the both side edges are overlapped, and this jointed part is heated with high frequency while applying pressure from the outside surface to form the inner cylinder (40).
An intermediate cylinder (41) made of No. 1 is formed on the aluminum to be fitted onto the outside of No. 0),
In addition, the inner cylinder (40) and the intermediate cylinder (4I) are pressurized and heated by an expandable heating inner mold (not shown) placed inside the inner cylinder 1W (40). The inner periphery of the outer mold (50) is fixed to the body and then placed outside the intermediate cylinder C41);
A synthetic resin is extruded between the outer surface of the intermediate cylinder (41) and a synthetic resin outer R (42) is formed by extrusion lamination.

In this manufacturing process, the order of forming the synthetic resin inner tube (40) and the aluminum foil intermediate tube (41) may be reversed, that is, after forming the aluminum foil intermediate tube (40), this intermediate tube (40) may be formed. An inner mold (not shown) is placed inside the tube (41),
The inner cylinder (40) may be formed by extrusion lamination by extruding a synthetic resin between the inner circumference and the inner surface of the intermediate cylinder (41).

By doing this, a gap is created by the synthetic resin layer between the side edges of the aluminum foil at the joint part of the tube body (B),
This eliminates the risk of the chemicals inside the tube seeping out from the synthetic resin layer in the gap, or the barrier properties being degraded due to this gap.Furthermore, there is no large unevenness at the joint, and printing on the outside surface is avoided. This makes it possible to perform

(Effects of the invention) 1 unit of salt As explained above, when the method of the present invention is used, a barrier disk is interposed between the resin disks of the inner and outer layers, and this barrier disk is made of aluminum foil, so that it does not change over time and lasts for a long period of time. It exhibits high barrier properties over a long period of time, especially not only in the 4th part but also in the cylindrical part, and can prevent the contents from deteriorating in quality.

In addition, the opening of the cylinder is essentially closed by the opening force of the cylindrical part of the outer resin disc with the lid of the barrier disc made of aluminum foil. This eliminates the need for extra and complicated work, simplifying the overall manufacturing process and reducing costs.

[Brief explanation of drawings]

In the drawings, FIGS. 1 to 3 show manufacturing by the method of the present invention [
4 is a partially enlarged sectional view of the tube body; FIG. 5 is a vertical sectional view showing the manufacturing process of the tube body; and FIGS. 6 to 8 are vertical cross-sectional views showing the manufacturing process using a conventional method. It is a front view. (10)...Barrier disk, (
■)...Cylinder part, (12)...Shoulder part, (+3)...
... Lid part, (20) ... Inner layer resin disk, (23
)...Cylinder part, (22)...Shoulder part, (30)...Outer layer resin disk. Figure 5 Figure 61g5 Figure 7 Figure 8

Claims (1)

[Claims] A barrier disk having a cylindrical portion, a lid portion that closes one open end of the cylindrical portion, and a shoulder portion extending in a cone shape from the other open end of the cylindrical portion is molded from a single sheet of aluminum foil, while a barrier disk is molded from synthetic resin. An inner resin disk having a cylindrical portion and a cone-shaped shoulder extending from the open end of the cylindrical portion is molded, a barrier disk is fitted onto the inner resin disk and adhered, and then the outer side of the barrier disk is molded. A method for manufacturing a shoulder of a laminated tube, characterized in that an outer resin disk is integrally molded.