阅读说明：本技术 用于容器的通气开口的过滤器 (Filter for a ventilation opening of a container ) 是由 R·托特 E·奥斯蒂恩 于 2020-04-13 设计创作，主要内容包括：一种用于容器的通气开口的过滤器包括过滤器元件以及围绕所述过滤器元件的凸缘,其中所述过滤器元件和所述凸缘通过注射成型工艺成为一体,在所述注射成型工艺中,将材料注射于模具中的固体过滤器元件上,在固化之后由所述材料产生所述凸缘。所述过滤器元件具有沿周向方向延伸的边缘部分。所述边缘部分设置有正面、背面以及在所述正面与所述背面之间延伸的侧边缘。所述背面被所述凸缘的材料覆盖,并且所述侧边缘沿所述边缘部分的周向方向被所述凸缘的材料从所述背面交替地完全地覆盖和部分地覆盖。在所述侧边缘被完全地覆盖的位置处,所述正面也被所述凸缘的材料覆盖。(A filter for a vent opening of a container comprises a filter element and a flange surrounding the filter element, wherein the filter element and the flange are integrated by an injection moulding process in which a material is injected onto a solid filter element in a mould, the flange being produced from the material after curing. The filter element has an edge portion extending in a circumferential direction. The edge portion is provided with a front face, a back face, and side edges extending between the front face and the back face. The back face is covered by the material of the flange, and the side edges are alternately completely covered and partially covered from the back face in the circumferential direction of the edge portion by the material of the flange. At the location where the side edges are completely covered, the front face is also covered by the material of the flange.)

1. A filter (1) for a ventilation opening of a container, the filter (1) comprising a filter element (2) and a flange (3) surrounding the filter element (2), wherein the filter element (2) and the flange (3) are integrated by an injection moulding process in which a material is injected onto a solid filter element (2) in a mould, from which material the flange (3) is produced after solidification, and the filter element (2) has an edge portion (4) extending in a circumferential direction, wherein the edge portion (4) is provided with a front face (5), a rear face (7) and side edges (6) extending between the front face (5) and the rear face (7), wherein the rear face (7) is covered by the material of the flange (3), and the side edges (6) are covered by the material of the flange (3) in the circumferential direction of the edge portion (4) The material is alternately completely covered and partially covered from the back side (7), wherein the front side (5) is also covered by the material of the flange (3) at the location where the side edge (6) is completely covered.

2. Filter (1) according to claim 1, characterized in that the positions where the side edges (6) are completely covered are located at equal distances from each other in the circumferential direction of the edge portion (4).

3. Filter (1) according to claim 1 or 2, characterized in that the filter element (2) is made of sintered polymer.

4. Filter (1) according to claim 3, wherein the filter element (2) and the flange (3) are made of the same polymer, for example polyethylene.

5. A filter (1) according to any one of the preceding claims, characterised in that the filter element (2) has a dome shape at the inner side of the edge portion (4).

6. A filter (1) as claimed in claim 5, characterised in that the dome-shaped bulge is located at a front face (5) of the edge portion (4), and that the flange (3) is provided with a wall extending transversely over the flange (3) at a rear face (7) of the edge portion (4) in order to form a tube (8) for guiding a fluid through the filter element (2).

7. Filter (1) according to claim 6, characterized in that the tube (8) is provided with a thread at its outer side for releasably mounting a sealing cover on the tube (8).

8. A filter (1) as claimed in any one of the preceding claims, characterised in that the covering at the front face (5) forms a protrusion from the flange (3).

Technical Field

The invention relates to a filter for a ventilation opening of a container.

Background

In the food industry, products are packaged in a protective atmosphere in order to prolong the preservation of the product. For example, in the case of packaging a powdered dairy product in a container, the amount of oxygen in the container may be reduced by replacing the oxygen in the container with nitrogen or a mixture of carbon dioxide and nitrogen. Air may be removed from the container by a vacuum technique, after which the product may be purged with an inert gas. Inert gas may be blown into the powder until the environment in the container is again atmospheric. In order to remove air from the container without evacuating the stored product, the container is provided with a filter which will be sealed after removing the air and introducing an inert gas through it.

Disclosure of Invention

It is an object of the present invention to provide a simple but reliable filter, which is suitable for the above-mentioned applications.

This object is achieved by a filter according to the invention, which is provided with a filter element and a flange surrounding the filter element, wherein the filter element and the flange are integrated by means of an injection moulding process, in which material is injected onto a solid filter element in a mould, the flange being produced from the material after solidification, and the filter element has an edge portion extending in a circumferential direction, wherein the edge portion is provided with a front face, a rear face and side edges extending between the front face and the rear face, wherein the rear face is covered by the material of the flange, and the side edges are alternately completely covered and partially covered from the rear face in the circumferential direction of the edge portion by the material of the flange, wherein at the location where the side edges are completely covered, the front face is also covered by the material of the flange.

An advantage of the filter according to the invention is that in an injection moulding mould the filter element can be positioned by means of retaining fingers and retained at a position where the edge portion is only partly covered by the material of the flange. Furthermore, the alternating coverings of the front face of the edge portion exhibit a favourable effect on the stability of the shape of the flange, since they minimize the tendency to warp.

The positions where the side edges are completely covered may be located at equal distances from each other in the circumferential direction of the edge portion.

The filter element may be made of a sintered polymer.

The filter element and the flange may be made of the same polymer, for example polyethylene. This has a positive effect on the adhesion between the filter element and the flange.

The filter element may have a dome shape at an inner side of the edge portion.

In a particular embodiment, the dome-shaped protrusion is located at a front face of the rim portion, wherein the flange is provided with a wall extending transversely on the flange at a rear face of the rim portion, so as to form a tube for guiding fluid through the filter element.

Preferably, the tube is provided with a thread at its outer side for releasably mounting the sealing cap on the tube.

The cover at the front face may form a protrusion from the flange.

Drawings

Fig. 1 is a perspective cross-sectional view of an embodiment of a filter according to the present invention.

Fig. 2 is a plan view of the embodiment according to fig. 1.

Fig. 3 is a sectional view taken along line III-III in fig. 2.

Fig. 4 is a side view of the embodiment according to fig. 1.

Detailed Description

Fig. 1-4 show different views of an embodiment of a filter 1 according to the invention. The filter 1 comprises a filter element 2 surrounded by a flange 3. The filter 1 is made by a moulding process. The filter element 2 is made of sintered polyethylene and is placed in the form of a prefabricated solid part in an injection moulding mould, after which the liquid polyethylene used to form the surrounding flange 3 is introduced into the injection moulding mould in order to form the resulting filter 1.

The filter 1 may be mounted to a container (not shown), for example by welding a flange to the peripheral edge of an opening in the container. When the container is filled with a product with limited preservability, for example for the food industry, air can be removed from the container via the filter 1, while the product cannot be withdrawn due to the presence of the filter 1.

Fig. 2 and 3 show that the filter element 2 has an annular edge portion 4 extending in the circumferential direction. The filter element 2 has a dome shape at the inner side of the rim portion 4, but in alternative embodiments it may have a different shape and may for example be flat. The edge portion 4 has a front face 5, side edges 6 and a back face 7. The side edges 6 extend between the front face 5 and the rear face 7. The back face 7 of the rim portion 4 is completely covered by the material of the flange 3, while the side edges 6 are alternately completely covered and partially covered from the back face 7 by the material of the flange 3 in the circumferential direction of the rim portion 4. The front face 5 of the rim portion 4 is also covered by the material of the flange 3 at the location where the side edge 6 is completely covered.

Fig. 1 shows that the positions where the side edges 6 are completely covered are located at equal distances from each other in the circumferential direction of the edge portion 4.

Fig. 1, 3 and 4 show that the dome-shaped bulge is located at the upper face 5 of the rim portion 4.

At the back 7 of the rim portion 4, the flange 3 is provided with a tubular portion 8, said tubular portion 8 extending perpendicular to the plane of the flange 3. The outside of the tubular part 8 is provided with a thread on which a sealing cap (not shown) can be screwed. When the filter 1 is mounted on a container to be ventilated, the container can be sealed from the ambient air by a sealing cover after removal of the air and possible introduction of inert gas into the container.

The filter element 2 and the flange 3 are made of the same basic material, for example polyethylene. Thus, during the injection moulding process, the outer side of the edge portion 4 of the filter element 2 is fused with the material of the flange 3.

The invention is not limited to the embodiments shown in the drawings and described above, which may be varied in different ways within the scope of the invention.