DE10307667A1 - Fabrication method for container, involves bending projection towards inner side to enclose bottom portion of plug after plug is placed in opening - Google Patents

Abstract

The method involves bending a projection towards the inner side to enclose the bottom portion (12) of a plug (5), after the plug is placed in an opening (4). The opening is formed at the bottom (3) of a container main body (2) and leads to the container interior.

Description

The invention relates to a method for producing a can, especially a can, which under high Pressure is put, with a can body with an opening, being this opening and thus sealed an interior of the can with a stopper becomes.

State of technology

Such cans are known in many forms and designs and are on the market. Only for example is the US 4 185 758 or the EP-A-0 17 147 directed.

In all of these, the one used is limited Graft the pressure applied to the interior of the can can be. So far, this limit was around 30 bar, although of course the Limiting the pressure of both the material of the plug and its Design as well as the design of the opening depended. Surrendered when punching out the opening For example, significant burrs, it could easily damage it of the stopper so that it comes off at low pressures the opening flew.

Even if it's a relatively straight one Until the edge of the opening is reached, plugs have held a maximum of one Pressure stood at 40 bar as it was in this area within the interior the cans when swirling compressed air to swirl can come, so that the plug vibrates and is cut. This injury leads then to make it shoot out of the opening more easily.

task

The present invention lies the task is based on a method for producing a can and a to offer a corresponding box in which the stopper is secured in the opening is held.

Solution of task

The solution to the problem is that when manufacturing the can body at least partially around the openings formed around at least one protrusion and after insertion the plug into the opening is reshaped inside.

That means for the stopper a mechanical stop is formed. This mechanical hold causes that pressure on the stopper from inside the can body acts, is counteracted.

The more the plug through the or the ledges is held, the more tightly the plug sits in the opening and with the higher Pressure can be applied to the interior of the can body. It doesn't matter where the opening on the inner can body is provided, preferably it is located in the floor area. Further it doesn't matter what material the plug is made of and what shape it has.

In a preferred embodiment shouldn't be single or for example crenellated projections act, but a closed neck collar, which in the use position surrounds the stopper. Both in terms of manufacturing technology and of This neck collar ensures that the plug is held securely to prefer. It surrounds the stopper overall so that the stopper not even under very high pressure due to any breaks in the neck collar can dodge.

This neck collar is made after insertion the plug into the opening reshaped inside. For example, this is done using a special tool, through which the edge of the neck collar is dipped inwards can. But here are many options conceivable and are intended to be encompassed by the present invention.

In an extreme case there would even be the possibility, by reshaping the neck collar accordingly to close the stopper. The can could be extremely high Pressure without the plug evading. This is but not preferred because the plug is also preferred as a safety valve should serve. Because he should at least then out of the opening shoot out when a can internal pressure exceeds a predetermined value. For example, this value is 100 bar.

It is also thought of the can body against the To form a neck collar or similar projections. This comes in between the neck collar and the neck collar there is a material accumulation, so a later punched hole in this area has a greater depth, what a Risk of injury to the stopper is reduced. Would only the bottom plate of the can body punched out alone, so there would be themselves in the area of the opening a very thin ring that easily cuts into the stopper. This is avoided by the material accumulation.

Furthermore, the opening for the stopper is punched out with a larger diameter than the counter-neck collar has. This in turn ensures that a thin-walled ring does not remain inside the opening, which can cut into the stopper. Furthermore, there is no dangerous ridge dung that can also injure the plug. A punching ridge forms at most against the interior of the can body, but this punching ridge is harmless.

Overall, a can is created which are particularly suitable for absorbing products or gases under high pressure suitable is. For example, the can also serves after being filled Compressed air or liquid gases as Print cartridge or energy cell for Nailers. However, this is only an example of use, many others are conceivable and are intended to be encompassed by the invention.

figure description

Other advantages, features and details The invention is more preferred from the following description embodiments as well as from the drawing; this shows in

1 a partially shown longitudinal section through a can body in the bottom region;

2 a partially shown longitudinal section accordingly 1 through the can body after a further process step;

3 a partially shown longitudinal section through the can body according to 2 with plug inserted.

From a can to hold a product or gas in an interior 1 is according to the 1 to 3 part of a can body 2 shown the down a floor 3 formed. The floor is in its final state 3 , as in 3 shown, arched inwards and has an opening 4 to hold a stopper 5 ,

The production of such a can body 2 happens as follows:
In a first method step (not shown), for example, a cylindrical blank becomes the cylindrical can body 2 with the floor 3 formed. At the same time or after that the ground 3 about the later opening 4 around a neck collar 6 outwards and a counter neck collar 7 molded on the inside. The counter neck collar 7 a smaller diameter d ₁ than the diameter d _{2 of} the neck collar 6 , The corresponding neck spaces 8th and 9 of counter neck collar 7 and neck collar 6 are through a remaining footbridge 10 separated from each other.

To now have access to the interior 1 of the can body 2 to create, this floor must 10 be removed. This is done, for example, by means of a corresponding punching, whereby 2 the opening 4 in the ground 3 arises. It is punched with a certain excess, so that a diameter d _{3 of} the opening 4 is slightly larger than the diameter d ₁ , but still smaller than the diameter d ₂ .

The next step in the process is the soil 3 deformed inwards as in 3 shown. Now the interior can 1 fumigated or with any product through the opening 4 be filled through, for example a valve or another arbitrary closure being placed on the other end of the can body.

To close the interior 1 is in the opening 4 the stopper 5 inserted or pressed in, the plug 5 preferably in the area of the opening 4 a waist 11 formed.

The last step in the process is the neck collar 6 folded inside so that he has the neck space 9 at least partially closes. This makes a mushroom-shaped head 12 of the stopper 5 in the neck space 9 captured.

Position Number List

Claims (8)

Method for producing a can, in particular a can, which is put under high pressure, with a can body ( 2 ) with an opening ( 4 ) for filling an interior ( 1 ), the opening ( 4 ) with a stopper ( 5 ) is closed, characterized in that when producing the can body ( 2 ) at least partially around the opening ( 4 ) at least a head start ( 6 . 7 ) and after inserting the plug ( 5 ) in the opening ( 4 ) is formed inside. A method according to claim 1, characterized in that when producing the can body ( 2 ) around the opening ( 4 ) around a neck collar ( 6 ) and its free edge after inserting the plug ( 5 ) in the opening ( 4 ) is formed inside. A method according to claim 1 or 2, characterized in that around the opening ( 4 ) around to the interior ( 1 ) of the can body ( 2 ) towards a neck collar ( 7 ) is formed. Method according to one of claims 1-3, characterized in that the free edge of the protrusion or neck collar ( 6 ) is dipped inside. Can to hold a product or gas, especially under high pressure, with a can body ( 2 ) with an opening ( 4 ) to an interior ( 1 ) in which there is a stopper after filling ( 5 ), characterized in that at least partially around the opening ( 4 ) around the can body ( 2 ) at least one protrusion, preferably a neck collar ( 6 . 7 ) is molded on. Box according to claim 5, characterized in that the diameter (d ₂ ) of the neck collar or the contour on which the projections ( 6 ) are arranged, is larger than the diameter (d ₃ ) of the opening ( 4 ). Can according to claim 5 or 6, characterized in that the can body ( 2 ) on the other hand the neck collar ( 6 ) a neck collar ( 7 ) is molded on. Box according to claim 7, characterized in that the counter neck collar ( 7 ) before forming the opening ( 4 ) has a smaller diameter (d,) than the opening ( 4 ).