JPS5820664B2 - Dip tube for aerosol and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aerosol dip tube and a method for manufacturing the same, which can be bent freely with the inclination of the aerosol container even when the conventional container is tilted or inverted. Dip tubes existed that could follow the movement of the contents and ensure inhalation of the contents.

Conventionally, such dip tubes are made of soft elastic material.
・If a pipe with a large diameter is used for its entire length or part of the pipe, it may become tangled, or if bent at a sharp angle, the inner wall surface may come into close contact with each other, or the flow interval may be narrowed, resulting in the injection of contents. It had drawbacks that made it impossible or difficult to do so.

The present invention eliminates the above-mentioned drawbacks and makes it possible to ensure the flexibility of the dip tube without the drawbacks of blocking or narrowing the flow interval.

To explain one embodiment below, reference numeral 1 is a coil spring made of a suitable material such as metal, and the upper end houses an aerosol valve mechanism. 3 is fixed.

This fixation is performed by inserting the heavy object 3 into a holding frame 4 whose one end is engaged and fixed inside the lower end of the coil spring 1.The holding frame 4 has a flow passage 5 so as not to obstruct the flow of the contents. is formed.

The outer circumferential side of the coil spring 1 with the housing 2 and the heavy object 3 fixed to both upper and lower ends as described above is stretched to the extent that the restoring force is not lost as shown in FIG. The coating film 6 is coated liquid-tightly and the coil spring 1 is bonded to the coil spring 1.

This adhesion may be performed by applying an adhesive to the outer surface of the coil spring 1 in advance, or by heating the coil spring 1 appropriately and heat-sealing the covering film 6, or by heat-sealing the covering film 6. After coating the coil spring 1, heat sealing may be performed by heating from the outer periphery, and any method can be used.

After the coil spring 1 and the covering film 6 are bonded together, when the tension on the coil spring 1 is released, it contracts as shown in FIG. 2, and the covering film 6 becomes bellows-shaped with many folds 7. .

Since the present invention is as described above, it is easy to manufacture, and the covering film can be easily formed into a bellows-like shape with a large number of folds.

In addition, even if the coil spring expands, contracts, or bends due to these folds, the coating film can follow this expansion, contraction, or bending, and even if the aerosol container is inverted, tilted, etc. It becomes possible.

Also, since it is formed with a coil spring, the flow interval of the tip tube formed on the inner surface of the coating film is
Regardless of the expansion/contraction, bending, etc. of the coil spring, it remains approximately constant, does not impede the flow of the contents at all, and can always stably inject the contents.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional view showing the coil spring in an expanded state, and FIG. 2 is a cross-sectional view showing the coil spring in a contracted state. 1...Coil spring, 6...Covering film, 7...Folds.

Claims (1)

[Scope of Claims] 1. An aerosol dip tube characterized in that a bellows-shaped covering film with numerous folds is fixed liquid-tightly to the outer circumferential side of a freely extensible coil spring. 2. After the coil spring is in a stretched state, a covering film is coated and fixed on the outer periphery of the stretched coil spring using an appropriate method, and then the stretched coil spring is contracted to form a large number of folds in the covering film in a bellows shape. A method for manufacturing an aerosol dip tube, comprising: forming a dip tube for an aerosol;