JPH09226786A - Metallic tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a coated film from peeling at an opening edge where a metal is exposed by vibration during transportation, by forming an opening edge, where a coat film of an opening to be filled with contents is not applied, into a shape drawn inwardly into a tapered state, in a vacant metallic tube before it is filled with the contents. SOLUTION: In a metallic tube to be filled with contents such as pharmaceutical preparations and cosmetics, in regard to a vacant metallic tube before it is filled with the contents, a top end part of a cylindrical barrel part 2 is made to be an opening 3 for filling the contents. At a bottom end part, a mouth part 5 to which a cap 4 is to be attached is protruded. An opening edge 6 of the barrel part 2 is formed into a tapered shape drawn slightly inwardly to an extent that it does not interfere the filling work of the contents. On the surface of the barrel part 2, a coated film 7 for preventing corrosion is formed over the whole face of the underside from the opening edge 6. In the tube 1 like this, as the opening edge 6 is being drawn into the state tapered inwardly, a problem that the coated film 7 is scrubbed away by the vibration during transportation is resolved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an empty metal tube before being filled with creamy medicines, cosmetics and other contents.

[0002]

2. Description of the Related Art An empty metal tube before filling contents is
It has a cylindrical body with one end open, and the other end has a mouth for attaching a cap.The body surface is colorfully coated to prevent metal corrosion. There is. However, in order to prevent the surface paint from wrapping around the inner surface of the metallic tube, it is a reality that the metal is exposed without being painted on the opening edge of the body.

When the factory for manufacturing empty metal tubes before filling the contents and the contents filling factory are separated from each other, the above-mentioned metallic tube 41 has a cap screwed into its mouth,
As shown in FIG. 6, a fixed number of the pieces are stood upright, boxed in a case 42, loaded on a truck, and transported.

[0004]

However, the metallic tubes packaged in the case are liable to be damaged by vibration during transportation.
As shown in FIG. 7, the metal powder rubs against each other at the exposed opening edge portion 43, and the metal powder 44 scatters. As a result,
There is a drawback that metal powder adheres to the coating surface, or the exposed metal part and the coating surface rub against each other via the metal powder, causing black blemishes and eventually peeling the coating material. Furthermore, the metal powder may enter the inside through the opening, which is a quality problem.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a metallic tube in which metal powder does not scatter due to vibration during transportation and black scratches do not occur. It is to be.

[0006]

The metallic tube of the present invention is an empty metallic tube before filling the contents, wherein the opening edge where the coating film of the opening for filling the contents is not applied is the inner side. It is characterized in that it is squeezed into a tapered shape.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The metallic tube 1 of the present invention is specifically a molded product of aluminum, and as shown in FIG. 1, for filling the upper end of a cylindrical body 2 with contents. The opening 5 of the body 2 is formed so as to project the opening 5 to which the cap 4 is attached, and the opening edge 6 of the body 2 is tapered slightly inward so as not to hinder the work of filling the contents. It has a squeezed shape. In the figure, the wall thickness is drawn thicker than the actual thickness.

On the surface of the body portion 2, a coating film 7 (underprinting) for preventing corrosion is formed on the entire surface below the opening edge portion 6, and the surface of the coating film 7 is usually a product name or the like. To print. The inner surface of the body 2 is coated with a resin varnish so that the contents to be filled inside the body 2 do not come into direct contact with aluminum.

The empty metallic tube 1 is commercialized in a state in which the upper portion of the body 2 is crushed after the contents are filled and the crushed portion is folded back a few times so that the contents do not leak outside. A rubber coating 8 is attached to the inner surface of the upper portion of the body portion 2 in a ring shape to improve the adhesion when crushed.

The above-mentioned metallic tube 1 is formed from a disc-shaped blank, and includes a drawing step by impact molding, a step of cutting off the opening end, a step of threading the mouth part 5, an annealing step, and a body part 2. A step of forming a varnish layer on the inner surface, a step of forming a coating film 7 on the surface of the body portion 2 excluding the opening edge portion 6, a step of fitting the cap 4 into the mouth portion 5, and an inner surface of the upper portion of the body portion 2. The step of forming the rubber coating 8 and finally the step of forming the metallic tube 1 of the present invention are completed.

The process uses a mold 11 as shown in FIG. In this mold 11, a ring-shaped peripheral wall 13 is hung on an edge of a disk-shaped ceiling wall 12 to form a space 14 into which the opening 3 of the metallic tube 1 is pushed,
The inner diameter of the peripheral wall 13 is tapered from the middle part to the upper part. An opening 3 is provided below the mold 11.
The metal tube 1 is placed with the top facing upward, and the upper portion of the metal tube 1 is pushed into the mold 11 as shown in FIG. 3 to taper the opening edge 6 inward according to the inner surface shape of the peripheral wall 13. Narrow down to the shape.

The metal tubes 1 thus formed are packed into a case in a predetermined number and transported to the contents filling factory, and the adjacent metal tubes are vibrated during the transportation. 4, the impact is applied to the surface of the coating film 7 of the body 2, as shown in FIG. That is, the opening edge portion 6 in which aluminum is exposed on the surface does not rub against each other because it is tapered inward.

In the above embodiment, only the opening edge portion 6 where aluminum is exposed on the surface is tapered inward. However, as shown in FIG. 5, the coating film slightly below the opening edge portion 6 is formed. It is also possible to squeeze inward, including the part where 7 is formed.

[0014]

EFFECTS OF THE INVENTION When the metal tubes of the present invention are packed in a case with a fixed number of them standing upright with their openings facing upwards and transported, the vibrations during transportation cause the adjacent metal tubes to be adjacent to each other. Although an impact is applied, the opening edge where the metal is exposed on the surface is tapered inward so it does not rub, and as a result, the coating film surface rubs against each other, and this coating film does not peel off Therefore, unlike the conventional case, the metal powder does not scatter, and therefore, the appearance and the inside of the transported metallic tube are maintained in the same good condition as before the packaging.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a metallic tube according to the present invention.

FIG. 2 is a state diagram in which a metallic tube is arranged below a mold.

FIG. 3 is a state diagram in which a metallic tube is pushed into a mold.

FIG. 4 is a front view showing a state of a metallic tube packed in a case during transportation.

FIG. 5 is a front view showing another embodiment of the metallic tube according to the present invention.

FIG. 6 is a perspective view showing a state where a conventional metal tube is packed in a case.

FIG. 7 is a front view showing a state where a conventional metal tube packed in a case is being transported.

[Explanation of symbols]

 1 Metallic tube 3 Opening 6 Opening edge 7 Coating film

Claims (1)

[Claims] 1. In an empty metallic tube (1) before filling contents, an opening edge (6) of the opening (3) for filling contents is not coated with a coating film (7). A metal tube characterized in that it is squeezed into a tapered shape.