DE9208612U1 - Tin containers - Google Patents

Description

Huber Packaging

GmbH +Co. F 14,197 fl/h

SHEET METAL CONTAINERS

The invention relates to a container made of sheet metal, in particular thin sheet metal, preferably very thin sheet metal, for holding liquid, pasty, powdery and/or granular filling materials, in particular those of a gas-emitting nature, primarily solvent-containing substances with a low boiling point, substances filled at a temperature deviating from the ambient temperature and the like, in the wall of which an automatically operating pressure equalization valve is inserted.

Different filling materials are stored in containers of this type, from solid (granular or powdery) to liquid. Depending on the filling conditions or type of filling material, after filling and closing the container, overpressure or underpressure conditions can occur in the interior of the container compared to the surroundings of the container; the following examples are given: In order to make filling easier, filling materials are filled in a warm state, i.e. above room temperature. After cooling to ambient temperature, this has the effect of gas-tight sealed containers.

bind a negative pressure that can lead to the deformation of the container. On the other hand, filling can take place at temperatures that are below the later storage or transport temperature. After closing the container and storing it accordingly, excess pressure builds up and thus also deformation of the container. Furthermore, filling materials of the type in question here can be highly gassy, for example containing solvents, as is the case with shoe or carpet glue, for example. Here too, excess pressure and thus deformation can easily occur. The aforementioned circumstances can sometimes exist in combination.

The aforementioned deformations can also impair the stackability of such containers.

It is known to provide pressure-dependent valves for pressure equalization, which basically work depending on the direction of pressure and allow not only gaseous substances to pass through, but also the contents, especially in liquid form. Even if such a valve is installed in the topsoil area, under which normally only gaseous substances are found, it will not be possible to prevent the contents themselves from entering the area of the valve due to the movement during transport and thus escaping from the container under excess pressure.

The invention is based on the object of providing a container of the type mentioned at the beginning, in which pressure equalization takes place under normal conditions without the filling material being

penetrates the container wall.

Starting from a container of the type mentioned at the beginning, this object is achieved according to the invention by a valve body that operates independently of the direction of pressure and is made of a porous plastic that is gas-permeable and impermeable to the filling material under the filling and storage or transport temperature conditions.

The valve body, which is preferably made of polytetrafluoroethylene, from matted or woven fibers and/or in foamed form, is permeable to gaseous substances under appropriate pressures and impermeable to the filling material, even if it has a liquid consistency. The plastic valve body, which is designed to be porous in this respect, therefore acts less as a valve than as a filter in the classic sense. The surface tension of the filling material can be decisive for determining the porosity of the valve body.

The valve body preferably consists of foamed and/or fibrous polytetrafluoroethylene, which in the latter case is designed as felt and/or as a - preferably multi-layered - fabric. Other plastics with similar properties are also addressed.

The valve body is preferably accommodated in a valve nozzle and secured therein with the aid of a retaining insert that can be inserted into the nozzle. This retaining insert can - as can be seen from the following examples - be inserted into the valve nozzle from outside or inside the container, whereby this consideration refers to the container wall,

in particular the top wall of the container. This is held in place in any known way, penetrating the container wall, for example by means of a clamp fit, but also by welding and the like. The holding insert can be connected to the valve nozzle in its inserted position, which positions the valve body, by clamping, screwing and/or welding.

The passage opening through the valve body can be dimensioned by differently sized openings, especially in the holding insert, depending on the filling material or pressure conditions, whereby the holding insert can be seen as a mask that can be selected accordingly. Furthermore, the valve body can be provided with a shield towards the inside of the container, which provides a surge protection against the impact of filling material and, in particular in the case of viscous filling materials, prevents these from impacting the valve body.

The inventive design of the valve body as a pressure direction-independent filter permeable to gaseous substances and impermeable to substances in other aggregate states enables versatile use with different filling materials and protects the container against deformation in the event of temperature changes and/or overpressure or underpressure caused by the filling material, which not only avoids the risk of damage, but also ensures that the containers can be stacked due to their almost constant shape retention.

These and other embodiments of the invention result

from the subclaims, in particular in conjunction with the embodiments shown in the drawing, the following description of which explains the invention in more detail. They show:

Figure 1 shows a section through the longitudinal axis of a

overall cylindrical valve of a first embodiment, inserted into a sectioned surrounding area of a container top;

Figure 2 is a sectional view corresponding to that

according to Figure 1 of a second embodiment;

Figure 3 is a sectional view corresponding to that

according to Figure 1 of a third embodiment and

Figure 4 is a sectional view corresponding to that

according to Figure 1 of a fourth embodiment.

The embodiments have a total of 2 "pressure compensation valves", each of which has a valve body 3, which is positioned between a valve nozzle 4 and a retaining insert 5. Figure 1 shows the fixing of the valve nozzle 4 in the top wall of the container 1. This fixing is made by a beveled edge of a container opening appropriately dimensioned to accommodate the valve nozzle 4 being inserted into an undercut, circumferential groove 7 of the valve nozzle 4.

intervenes.

In the embodiments according to Figures 1 and 2, the retaining insert 5 is inserted into the valve socket 4 from the outside of the container, namely by means of a pressing process, i.e. the retaining insert 5 is clamped into the valve socket 4. The valve body 3 received and held in this way in its circular edge area between the valve socket 4 and the insert part 5 consists of a foamed and/or woven, felted or similar valve body 3 made of plastic fibers, which is permeable to gases and impermeable to liquids and solid goods. The order of magnitude of the permeability or the pressure difference required for the gas to pass through can be determined by the porosity of the plastic or its thickness. Furthermore, it is possible to determine the transition cross-section of the valve body 3, as can be seen from the different design of the valve nozzle 4 in the support area of the valve body 3 in Figures 1 and 2 - mask opening 12.

Figures 3 and 4 show designs in which the surface of the valve body 3 facing the inside of the container is covered by a splash guard attachment 11, which is either formed on the valve nozzle 4 - retaining insert 5 inserted into the valve nozzle from the outside, Figure 3 - or on the retaining insert 5, retaining insert 5 inserted into the valve nozzle 4 from the inside of the container, Figure 4. In Figures 3 and 4, contours can be seen that reveal an undercut engagement 9 between retaining insert 5 and valve nozzle 4. Here too, the retaining insert can be fixed

5 to the valve socket 4 by clamping (pressing in), but a type of thread can also be provided; finally, in all of these embodiments, the retaining insert can also be welded to the valve socket in the inserted position, as is indicated at 10.

The valve nozzle 4 is provided with a radially outer fixing section 6 as a tubular body, which has a radially inner receiving section 8 for fixing the retaining insert 5. Depending on the design and size of this radially inner receiving section 8, reinforcing ribs 13 are formed between it and the adjacent wall of the radially outer fixing section 6.

Claims (12)

Huber Verpackungen GmbH +Co. F 14,197 fl/hi Claims 1. Container (1) made of sheet metal, in particular thin sheet metal, preferably very thin sheet metal, for holding liquid, pasty, powdery and/or granular filling materials, in particular those of a gas-emitting nature, primarily solvent-containing substances with a low boiling point, substances filled at a temperature that differs from the ambient temperature and the like, in the wall of which an automatically operating pressure equalization valve (2) is inserted, characterized by a valve body (3) that operates independently of the direction of pressure and is made of a porous plastic that is gas-permeable under the filling and storage or transport temperature conditions and impermeable to the filling material. 2. Container according to claim 1,
characterized, that the valve body (3) is made of polytetrafluoroethylene. - 2- 3. Container according to claim 1 or 2, characterized in that the valve body (3) is formed from felted plastic fibers. 4. Container according to claim 1 or 2, characterized in that the valve body (3) is formed from a plastic fiber fabric. 5. Container according to claim 1 or 2, characterized in that the valve body (3) consists of foamed plastic. 6. Container according to claim 4,
characterized in that the valve body (3) is formed from several layers of woven plastic fibers. 7. Container according to one of claims 1 to 6, characterized in that the valve body (3) is accommodated between a valve nozzle (4) fixed to the container wall, in particular the container top wall (1), and penetrating the latter, and a holding insert (5) which is fixed to the valve nozzle (4) by clamping, screwing, welding or the like. 8. Container according to claim 7,
characterized in that the holding insert (5) is inserted into the valve nozzle (4) from the outside of the container. -3- 9. Container according to claim 7,
characterized, that the retaining insert (5) is inserted into the valve nozzle (4) from the inside of the container. 10. Container according to one of claims 1 to 9,
characterized, that the passage diameter of the valve body (3) varies depending on the consistency of the filling material being taken up. 11. Container according to one of claims 1 to 10,
characterized, that, viewed from the inside of the container, the valve body (3) is provided with a splash guard (11) to prevent the impact of liquid filling materials on the valve body (3). 12. Container according to one of claims 1 to 11,
characterized, that the valve socket (4) has a radially outer fixing section (6) and a radially inner receiving section (8) for receiving the holding insert (5), between which reinforcing ribs (13) are formed.