JPH0585579A - Content feed container - Google Patents

Abstract

PURPOSE:To assure that the airtightness of a container is achieved by a piston slidably movable between upper and lower chambers without making it double piston in a content feed container wherein the slidably movable piston fitted in the container body is moved upward by the thrust pressure of an injecting gas provided in the lower chamber so as to discharge its contents. CONSTITUTION:A slidably movable piston 2 is composed of a cup-like piston 20 having an open bottom and a skirt 24 made of a soft cylindrical film or sheet fixed to a piston body part 23 and extending downward. The diameter of the piston body part 23 is made smaller than that of the body of a container 1 and the diameter of the lower part of the skirt 24 in a free-running condition is made nearly equal to the inside diameter of the body of the container 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contents discharge container, and more particularly to a contents discharge container of the type in which the contents in the container are discharged from a discharge port by the thrust of a piston contained in the container. Is.

[0002]

2. Description of the Related Art As a contents discharge container having a built-in piston, there is one already disclosed in Japanese Utility Model Publication No. 60-38529, in which, as shown in FIG. The sliding piston (2) is equipped with a valve (V) on the lid plate (11) that closes the upper end of (1), and the container main body (1) is equipped with a flexible annular tongue that contacts the inner surface of the body. ), And the main body of the container partitioned by this sliding piston (2)
The upper chamber (12) of the inside (1) contains the contents such as cosmetics and caulking agent, and the other lower chamber (13) is filled with a propellant gas.

In this type of contents discharge container, a valve
When (V) is opened, the sliding piston (2) is moved upward by the pressure of the injection gas in the lower chamber (13), and the contents in the upper chamber (12) are discharged from the valve (V). To be done. In particular, in this prior art, the sliding piston (2) is formed into a cup shape that opens downward, and a double piston configuration including a substantially similar first piston (2a) and second piston (2b) Since the sealant (A) is filled in the entire area between both pistons, the upper chamber (1
Airtightness between 2) and the lower chamber (13) is sufficiently secured.

The peripheral edges of the first piston (2a) and the second piston (2b) are in contact with the inner peripheral wall of the body of the container main body (1) by the annular tongues (21) and (22). Is the above sealant
(A) is interposed, and since the pressure of the injection gas in the lower chamber (13) acts to increase the pressure of the sealant (A), the annular tongues (21) (22) Sealant between
(A) is pressurized on the inner surface of the body of the container body (1), and the airtightness between the upper chamber (12) and the lower chamber (13), that is, the lower chamber
It is possible to eliminate the inconvenience that the injected gas in (13) is transferred to the contents in the upper chamber (12) to deteriorate the contents and the contents leak into the lower chamber (13).

However, in this conventional type, it is necessary to double the sliding piston (2) and the sealing agent (A) is used.
Since it is necessary to prepare, the structure becomes complicated and the assembling work of the sliding piston (2) is troublesome. When the bottom plate (14) is attached to the lower end of the body of the container body (1) in an airtight state by adhesion, the sliding piston (2) is attached to the container body (1) when the container body (1) is not attached. It is inserted inside, but at this time, the first piston (2a) and the second piston
The sealant (A) interposed between the bottom plate (14) and (2b) will contaminate the bottom open part of the container body (1), which is the adhesion part of the bottom plate (14), and the airtightness when the bottom plate (14) is bonded. Is insufficient.

The present invention has been made in view of the above-mentioned point. "The lid plate (11) for closing the upper end of the container body (1) is equipped with a valve (V) so that the inside of the container body (1) is Is divided into an upper chamber (12) and a lower chamber (13) by a sliding piston (2) that can slide up and down, and the upper chamber (12) is filled with the contents and the lower chamber (13)
In the contents discharge container in which the contents of the upper chamber (12) are discharged by filling the injection gas body with the valve (V) opened, the sliding piston (2) is a double piston. Sliding piston between the upper chamber (12) and the lower chamber (13) without
The task is to ensure the airtightness of (2).

[0007]

[Technical Means] A technical means of the present invention for solving the above-mentioned problem is that "a sliding piston (2) has a cup-shaped piston main body (20) that opens downward and a body part ( 2
3) is composed of a skirt body (24) whose upper end is fastened and extends below the body portion (23), and the diameter of the body portion (23) is smaller than the diameter of the body portion of the container main body (1). Also set small, the diameter of the lower part of the skirt body (24) in the free state
(1) The skirt body (24) is made of a flexible tubular film or sheet so as to substantially match the inner diameter of the body portion.

[0008]

The above technical means operates as follows. Since the diameter of the body (23) of the piston main body (20) is set smaller than the inner diameter of the body of the container main body (1), the sliding piston (2)
When the container is housed in the container body (1), the body (23) does not directly contact the inner peripheral wall of the container body (1). On the other hand, the skirt body (24) connected to the body portion (23) is composed of a flexible tubular film or sheet, and the diameter of the free state thereof is approximately the inner diameter of the body portion of the container main body (1). Since they coincide with each other, this skirt body (24) contacts the inner wall of the body of the container body (1). In particular, since the injected gas is contained in the lower chamber (13) below the sliding piston (2), the pressure of the injected gas tends to cause the skirt body (24) to swell, and the skirt body (2)
The entire lower part of 4) is pressed against the inner peripheral surface of the container main body (1).
Then, due to this pressing force, the skirt body (24) and the container main body
Airtightness is secured with the inner wall of the body of (1).

When the valve (V) is opened, the content in the upper chamber (12) is discharged by the above-mentioned action, and the sliding piston (2) moves upward. An upward pressing force acts on the whole of 20), and a radial pressing force acts on the entire lower part of the skirt body (24). Therefore, while the flexible skirt body (24) reliably contacts the inner wall of the body of the container body (1), the piston body (20) itself moves upward without contacting the inner peripheral wall of the container body (1). It will be.

[0010]

[Effect] The airtightness between the sliding piston (2) and the inner peripheral wall of the main body of the container (1) is determined by the close contact between the skirt (24) made of a flexible tubular film or sheet and the inner peripheral wall of the main container (1). The airtightness of this part will be sufficient. ． While the flexible skirt body (24) surely contacts the inner wall of the body of the container body (1), the piston body (20) itself moves upward without contacting the inner peripheral wall of the container body (1). When the contents are discharged, the sliding piston (2) moves up smoothly in the container main body (1). Therefore, even when the sliding piston (2) moves upward, there is no fear that the airtightness from the outer peripheral portion of the sliding piston (2) will be impaired.

[0011]

Embodiments of the present invention described above will now be described in detail with reference to the drawings. [Embodiment 1] In Embodiment 1 shown in FIG.
(0) is a cup shape formed by injection molding of synthetic resin, and a recessed portion that is recessed from the upper chamber (12) side to the lower chamber (13) side is formed at the center of the top, and the trunk (23 ), The lower half has a larger diameter than the upper half. The diameter of the lower half is set to be smaller than the inner diameter of the body of the container body (1).

A skirt body (24) is mounted and fixed so that the entire lower half portion and a part of the upper half portion of the body portion (23) are fitted and covered. Therefore, in this embodiment, the skirt body (24) is a tubular body made of a flexible sheet or film of vinyl chloride, polypropylene, nylon, etc., and what is called a uniaxially stretched tube is used. This uniaxially stretched tube (T) is stretched only in the radial direction,
It has a characteristic that its diameter is restored to the diameter before stretching by heating. Further, its outer diameter is made to substantially match the inner diameter of the body of the container body (1). The film thickness of the tube used in this embodiment is 0.02 mm to 0.2 mm, and preferably 0.03 mm to 0.1 mm.

As shown in FIG. 3, this is externally fitted to the above predetermined area below the body portion (23) to heat only a certain range (L) in the external fitting area. As a result, as shown in FIG. 4, the portion covered by the body portion (23) is attached in a state of being in close contact with the outer peripheral surface of the body portion (23). On the other hand, a skirt body (24) extending downward from the body (23)
The non-heated area of remains in the free state. Container-based (1)
Since the outer diameter of the container is approximately the same as the inner diameter of the body of the container body (1), if the sliding piston (2) with the above configuration is housed in the container body (1), the skirt body (24 The whole lower part of () adheres closely to the inner surface of the body of the container body (1).

Using the sliding piston (2) as the main body of the container
(1) In order to discharge the contents filled in the container, the container main body (1) is assembled as follows. ． Attach the valve (V) to the lid plate that closes the upper end of the container body (1), and open the container body (1) at the bottom. ． The container body (1) is set upside down, and a predetermined amount of content (M) is stored from the open bottom.

.. Then, the sliding piston (2) is inserted so that substantially the whole is buried in the content (M) as shown in FIG. ． Then, the bottom plate (14) is inserted from the bottom open side of the container body (1), and the skirt (1) of this bottom plate (14) is inserted as shown in FIG.
5) and the bottom open end of the container main body (1) are adhered by an adhesive (S), and the protruding end of the container main body (1) is caulked to be caulked.

.. Filling port for injection gas provided on the bottom plate (14)
Lower chamber (13) between (P) and sliding piston (2) and bottom plate (14)
A predetermined amount of injection gas is filled therein. The structure of the filling port (P) is a known structure and has a check valve function. Therefore, when the injection gas injection nozzle is inserted into this filling port (P), the injection gas injection circuit communicates with the inside of the lower chamber (13), and when the injection of the predetermined amount of injection gas is completed, the nozzle is filled with the injection port.
When removed from (P), the injection circuit is shut off.

As described above, the upper chamber (12) of the container main body (1) is filled with the contents and the lower chamber (13) is filled with the injection gas, and the lower chamber is opened by opening the valve (V). The sliding piston (2) is driven upward by the gas pressure of the injection gas in (13), and the contents are discharged from the valve (V). At this time, the skirt body (24) extending downward from the body part (23) is the container main body (1).
It will come into close contact with the inner peripheral surface of the body of the. In particular, since the skirt body (24) is composed of a tubular film or sheet made of the above-mentioned materials, when the inner peripheral surface of the container body (1) is scratched or has irregularities, Skirt body (24)
Is to follow the surface of the inner peripheral surface of the body of the container body (1). Then, while maintaining this state, the sliding piston
(2) will be driven upward. Also, skirt body (24)
Even if the free state diameter of the skirt body (1) is slightly smaller than the inner diameter of the body of the container body (1), the skirt body (24) is flexible due to the flexibility of the film or sheet. 24) By the circumferential extension of itself, it will be in close contact with the inner peripheral wall of the body of the container body (1).

In the first embodiment, the skirt body (24) is externally fitted and fixed to the body portion (23) of the piston main body (20).
The skirt body (24) and the body portion (23) may be connected in an airtight state by another structure such as being fixed to the inner peripheral portion of 3). or,
As shown in FIG. 7, the body portion (23) may have a small diameter portion (25) in the middle thereof.

Further, in the above embodiment, the uniaxially stretched tube is used, but it is also possible to employ the biaxially stretched tube. [Embodiment 2] In this embodiment, the skirt body (24) is formed by a bag having a downward opening made of a flexible film or sheet, and the tubular body made of the film or sheet is made to have a constant length. When cut and sealed at one end by welding, a bag (F) as shown in Fig. 8 is formed. Figure 9
As shown in Fig. 4, when the piston main body (20) is housed in this bag (F) and the top of the piston main body (20) and the top of the bag (F) are welded, the bag (F) is welded (26). ) By the piston main body (2
It will be fixed to 0). At this time, a part of the bag (F) extending from the lower end of the body portion (23) becomes the skirt body (24).

In this embodiment, the entire bag (F) is interposed between the upper chamber (12) and the lower chamber (13), and the bag (F) and the skirt body (24) are the same as those in the first embodiment. Since the joint with the body (23) does not occur, the skirt body (24) and the body (2
3) There is no concern about poor airtightness between and.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional example.

FIG. 2 is a sectional view of the first embodiment of the present invention.

[Fig.3] Illustration of manufacturing process of sliding piston (2) used for this.

[Fig. 4] Illustration of the completed sliding piston (2)

FIG. 5 is an explanatory diagram of a process of filling the content (M)

FIG. 6 is an explanatory view of a process of mounting and fixing the bottom plate (14)

FIG. 7 is an explanatory view of another type of sliding piston (2).

FIG. 8 is an explanatory view of a bag (F) used in Example 2.

FIG. 9 is an explanatory diagram of the second embodiment.

[Explanation of sign]

 (1) ・ ・ ・ Container main body (11) ・ ・ ・ Lid plate (V) ・ ・ ・ Valve (1) ・ ・ ・ Container main body (2) ・ ・ ・ Sliding piston (12) ・ ・ ・ Upper chamber (13 ) ・ ・ ・ Lower chamber (20) ・ ・ ・ Piston mainly (23) ・ ・ ・ Body (24) ・ ・ ・ Skirt body

Claims (1)

[Claims] A lid plate (11) for closing the upper end of the container body (1) is equipped with a valve (V), and a sliding piston (2) capable of sliding up and down inside the container body (1) is used. Upper room (12) and lower room (13)
The upper chamber (12) is filled with contents and the lower chamber (1
In the contents discharge container in which the contents of the upper chamber (12) are discharged by filling the injection gas body into (3) and opening the valve (V), the sliding piston (2) moves downward. The cup-shaped piston main body (20) that opens and the body (2
3) is composed of a skirt body (24) whose upper end is fastened and extends below the body portion (23), and the diameter of the body portion (23) is smaller than the diameter of the body portion of the container main body (1). Also set small, the diameter of the lower part of the skirt body (24) in the free state
A contents discharge container in which the skirt body (24) is made of a flexible tubular film or sheet so as to substantially match the inner diameter of the body portion of (1).