JPS6265759A - Production of aerosol container - Google Patents

Abstract

PURPOSE:To inexpensively and easily produce an aerosol container by molding the container and mounting cup of a synthetic resin material and welding a mouth part and the mounting cup. CONSTITUTION:This invention relates to the production of the aerosol container, in which the vessel 1 is formed of the synthetic resin such as PE terephthalate and an injection device 3 is attached to the mouth part 2 thereof. The mounting cup 9 is also molded of the similar synthetic resin and first a content liquid and gas are filled into the container 1, then the cup 11 is fitted to the mouth part 2 and the point where the top surface of the mouth part 2 and the inside surface of the cup 11 contact with each other is welded by ultrasonic waves or high frequency waves. Then the possibility of the attack by the content liquid is eliminated as a rubber packing is not used even if the content liquid contacts with the cup and mouth part. The extremely high airtightness is thus maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a method for manufacturing an aerosol container.

[Conventional technology]

The conventional manufacturing method of this kind is to mount an aluminum mounting so as to cover the upper part of the main mechanism of the injection device 100 and bring the bottom of the side wall into close contact with the outer peripheral surface recess 2a of the mouth 2 of the container 1, as shown in FIG. The injection device 100 was attached by caulking the cup 101. The injection device 100 houses a valve stem 104 urged upward by a spring 103 in a housing 102, and a flange 105 is formed at the upper edge of the housing 102, and the lower surface of the flange 105 and the upper edge of the mouth portion 2 are connected to each other. A rubber backing 106 is interposed between the valve stem 104 and the valve stem 104 so that the communication hole 107 of the valve stem 104 can be closed.
Close to the outer periphery of the flange 105 and on the upper surface of the flange 105! ! A gasket 108 is provided.

[Problem to be solved]

In the conventional example shown in FIG.
Since the rubber backing 106 is sandwiched between the upper edge of the mouth part 2 and the flange 105 when the mouth part 2 is closed in the air (when the bottom of the side wall is swaged), the liquid inside the rubber backing 106 is inserted between the upper edge of the mouth part 2 and the flange 105.
6, and as a result, it has the disadvantage that it cannot be used in cases where either the rubber or the liquid content changes in quality due to contact with the rubber. In addition, since the sealing of the mouth part 2 depends on the sealing process of the mounting cup Lot, defects may occur during sealing, such as the rubber backing 10.
6 cannot be pressed against the upper edge of the mouth part 2 with uniform pressure, gas leakage may occur, and there may be places where the mounting cup 101 is not in close contact with the outer circumferential surface depression 2a of the mouth part 2. . Furthermore, it takes time and effort to assemble the injection device 100 to the mouth portion 2, making it unsuitable for mass production at low cost.

The present invention was invented in view of the above circumstances, and provides a method for manufacturing an aerosol container that can be used even in a type that uses rubber as the liquid content, and can be manufactured at low cost and easily. The object of the present invention is to provide a method for manufacturing an aerosol container that is suitable for mass production and has good sealing performance.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention molds a mounting cup of a synthetic resin material to attach an injection device constituted by incorporating various parts into a housing to a container and its mouth. The process of filling the container with liquid and gas, the process of attaching the injection device and mounting cup to the mouth, and the point where the top surface of the mouth and the inner surface of the mounting cup to which the injection device is attached come into contact. The method includes a step of welding to form a fused portion.

[Effect]

In the aerosol container manufactured by this manufacturing method, since the container mouth and the mounting cup are both molded from a resin material, a fused portion can be formed at the location where the mouth and the mounting cup come into contact. Even if the content liquid comes into contact with the part, there is no risk that the rubber will be damaged by the content liquid because there is no rubber backing. The synthetic resin material is completely fused and the fused portion has extremely high airtightness.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to FIG. 2 and the following drawings.

In the present invention, a synthetic resin material is used as the material of the container 1, and no metal material or glass material is used.

The synthetic resin material used is preferably polyethylene terephthalate resin. Polyethylene terephthalate resin is suitable for aerosol containers because it has excellent transparency, a glossy surface, excellent gas barrier properties, and excellent content resistance and fragrance retention. It is. Further, biaxial stretch blow molding is employed to mold this container 1 from polyethylene terephthalate resin, and by biaxial stretch blow molding, mechanical strength can be increased and deterioration of transparency can be prevented.

As a method for forming the recess 2a on the outer circumferential surface of the mouth portion 2 of the polyethylene terephthalate resin container 1, for example, the method described in Japanese Patent Application Laid-Open No. 125470/1984 may be employed.

After the synthetic resin container 1 is molded in this manner, the injection device 3 is attached to the mouth portion 2. The main mechanism of this injection device 3 is that a valve stem 6 biased upward by a spring 5 is accommodated in a housing 4 having an introduction path 10 projecting downward on the lower surface, and a valve stem 6 is bored into the valve stem 6. Connect the communication hole 7 to the valve stem 6
A gasket 8 that closes when the housing 4 is urged upward is attached to the upper end of the housing 4 by a cap 9. The cap 9 is attached to the housing 4 by forming a protrusion 4a on the upper side surface of the housing 4, forming a hook-shaped portion 9a at the bottom of the side wall of the cap 9, and forming the hook-shaped portion 9a at the bottom of the side wall of the cap 9.
is engaged with the protrusion portion 4a. The spring 5 is made of stainless steel to prevent rust, and the gasket 8
The housing 4, the valve stem 6, and the cap 9 are all made of synthetic resin, except that the housing 4, the valve stem 6, and the cap 9 are made of synthetic rubber for airtightness. As a means for attaching the injection device 3 constructed in this way to the mouth portion 2 of the container 1, the housing 4
A mounting cup 1 integrally molded with the housing 4, which extends horizontally from the side surface of the housing 4 and is bent downward, is fitted into the mouth 2, and the portion where the upper surface of the mouth 2 and the inner surface of the mounting cup 11 come into contact is Weld using ultrasonic or high frequency waves.

The airtightness due to welding can be expected to be improved more when one of the joint surfaces that constitute the fused portion 12 is provided with a protrusion than when the joint surfaces are flat. In the embodiment shown in FIG. 2, the protrusion 13 is formed on the upper end surface of the mouth 2 of the container 1, but as shown in FIG.
3 may be formed. Note that it is also possible to alternately form the protrusions 13 on both surfaces to be joined, and to fit them in a concave-convex manner. The bottom of the side wall of the mounting cup 11 is formed into a hook-shaped portion 11a, which engages with the recess 2a of the mouth portion 2, so that preliminary sealing can be performed before welding. Further, as the material of the mounting cup II, synthetic resin such as polyacetal or nylon is desirable.

When the container 1 was made of polyethylene terephthalate resin and the mounting cup 11 was made of polyacetal or nylon, an extremely strong fused portion 12 was formed when welded using high frequency or ultrasonic waves. In particular, it was found as a result of the trial production that ultrasonic welding can be strongly welded. It goes without saying that other synthetic resin welding means may also be employed.

Further, in the embodiment shown in FIG. 2, the housing 4 of the injection device 3
Although the cap 9 and the mounting cup 11 are molded from a synthetic resin material such as polyacetal or nylon, the cap 9 and the mounting cup 11 may be integrally molded as shown in FIG.

Furthermore, as the injection device 3, it goes without saying that various devices other than the illustrated embodiment can be used.

〔effect〕

As explained above, the present invention includes a process of molding a container and a mounting cup for attaching an injection device, which is constructed by incorporating various parts into a housing, into the mouth of the container from a synthetic resin material; The step of filling the liquid and gas, the step of attaching the injection device and the mounting cup to the mouth, and the welding of the part where the upper surface of the mouth and the inner surface of the mounting cup to which the injection device is attached are welded to create a fused part. It is equipped with the process of forming. Therefore, there is no need to use a conventional rubber backing in areas where the content liquid comes into contact with more and where gas leakage is likely to occur, and the areas where the top surface of the mouth of the container and the inner surface of the mounting cup come into contact can be replaced with synthetic resin materials. Since the fused part is formed by welding, it is possible to fill and use the liquid even if the content is likely to deteriorate due to contact with rubber or metal (the container itself is made of metal). can. In addition, since it includes a process of welding synthetic resin materials together to form a fused part, a metal mounting cup is mechanically processed (for example, caulking) with a rubber backing interposed.
The airtightness is much better than when airtightness is achieved, and there is almost no occurrence of defective products as in the conventional method.

Furthermore, if an aerosol container is manufactured by the manufacturing method of the present invention, the number of parts will be reduced, the number of manufacturing steps will be reduced, and it will be possible to produce the container in large quantities at low cost. In particular, a manufacturing method in which a protrusion is formed on one or both of the joint surfaces that constitute the welded part between the mounting cup and the mouth of the container increases the welding strength of the welded part and prevents gas leakage. It becomes even more certain. Furthermore, the container is made of polyethylene terephthalate,
If the mounting cup is made of polyacetal or nylon and the welded part is welded by high frequency or ultrasonic waves, it will have the same effect as forming a protrusion, and the manufactured aerosol container will be extremely light and have sufficient mechanical strength. It also has excellent gas barrier properties and resistance to contents. Furthermore, in a manufacturing method in which the housing of the injection device and the mounting cup are integrally molded from a synthetic resin material, and the parts of the injection device are incorporated into the housing and the integrated product is attached to the mouth of the container,
Rubber backing, flange, gasket,
Finally, compared to assembly work such as metal mounting cups and caulking, it is extremely simplified.
Manufacturing efficiency can be significantly improved.

[Brief explanation of drawings]

Figure 1 is a sectional view showing a product manufactured by a conventional method;
FIG. 2 is a cross-sectional view showing an example of a product manufactured by the manufacturing method of the present invention, FIG. 3 is a partially enlarged cross-sectional view showing a modification of the fused portion of FIG. 2, and FIG. FIG. DESCRIPTION OF SYMBOLS 1... Container, 2... Mouth part, 3... Injection device, 4... Housing, 11... Mounting cup, 12... Fusion part.

Claims (1)

[Scope of Claims] 1. A step of molding a container and a mounting cup for attaching an injection device, which is constructed by incorporating various parts into a housing, into the opening of the container from a synthetic resin material; The process of filling liquid and gas, the process of attaching the injection device and mounting cup to the mouth, and the welding of the part where the top surface of the mouth and the inner surface of the mounting cup to which the injection device is attached are welded to form a fused part. A method for manufacturing an aerosol container, comprising the step of forming. 2. The housing of the injection device and the mounting cup are integrally molded from a synthetic resin material, and the parts of the injection device are assembled into the housing and the integrated body is attached to the mouth of the container. A method for manufacturing an aerosol container according to claim 1. 3. Claims 1 or 2, characterized in that a protrusion is formed on one or both of the joint surfaces constituting the fused portion between the mounting cup and the mouth of the container.
A method for manufacturing an aerosol container as described in Section 1. 4. The container is made of polyethylene terephthalate, the mounting cup is made of polyacetal or nylon, and these are welded using high frequency or ultrasonic waves. A method for manufacturing an aerosol container.