DE1022155B - Airtight container made of plastic - Google Patents

Description

Airtight Plastic Container The invention relates to a container which can be sealed airtight by welding and which can be welded Lid made of plastic and intended to make both the welding process easier and to make it more economical, as well as to make it easier to open later.

The airtight closure of containers of all kinds, such as cans, boxes etc., made of plastic by welding is known. If you use the abutment surfaces of lid and container for welding. so one is forced to use these abutment surfaces to make plastic by heating in order to achieve the to make thermoplastic properties of the plastic usable. That is procedural often cumbersome and expensive, possibly harmful to the contents of the container and also often not feasible because other parts of the container such as threads, mating surfaces, etc .. the risk of changes as a result of the creation of the T4 the weld seam are exposed to the necessary heat. In addition, the opening is like this sealed plastic container with a relatively wide weld seam heavy feasible. mostly only with the destruction of the container itself also coatings on the butt joints. meltable or malleable materials such as wax. thermoplastic plastic, etc .. attached to hermetically seal the container. These closures also behave similarly to those mentioned above.

It has now been found that it is possible to use an airtight seal to manufacture the plastic container. of the requirements for procedural technology and inexpensive design and at the same time easy to open guaranteed. without the risk of unauthorized opening.

According to the invention, containers and lids are attached to them for this purpose Butt edges to be connected with each other with pointed bulge-like thickenings Mistake. The possibility now exists. the pointed edges on top of each other to merge the container and lid to form a continuous weld seam.

The inventive design of the container makes it possible with a heated piston or roller at the appropriate speed and to drive along the joint edge of the hardener and lid with the appropriate pressure. Any material additives are not required, because the necessary material is present in the bead tip.

The warmth of the piston was difficult to get through from the tip of the bead the container wall are derived, so that the material at the tip of the bead melts immediately and converges there safely. The warmth that still comes from the Container- wall is derived is not sufficient. any other parts to melt the can, so that a change in important parts, such as There is no thread etc. and actually only a continuous one at the tip Tail seam is created. The tip of the bead is flattened and after welding an airtight connection of the container parts of high strength was created.

Just like the design of the container according to the invention, the manufacture the weld seam favors. it in turn also contributes to an easy release of the Weld seam at. Because the bead-like thickening from the surface of the The container protrudes. you can easily apply the weld seam several times to one hard surface, e.g. B. a table. hit, and the weld cracks open, so that the container parts can be detached from each other.

Even with stronger welded containers this type of opening is possible absolutely safe. because only the weld seam is hit when it hits.

Of course, you can also open it in other ways. The weld seam can, for. B. interrupted and the container parts can at this point of interruption be designed so that a knife or other sharpener. flat object can be introduced at this point to help close the weld blow up and so open the container. The opening point is then branded made of paper or another material pasted over and pierced when opening.

An opening device can also be inserted into the opening point before welding be inserted. It can consist of a sheet metal plate, which is used for handling protrudes from the container. If the airtightness of the opening is important the sheet metal plate is covered with an insulating layer.

By turning (edging) the opening device, the weld seam bursts. It is also possible through Inserting a wire or string to tear open the weld seam.

The training according to the invention is applicable to all containers Type regardless of the other type of closure, d. H. So, there can be containers can also be closed airtight with screw caps, slip-on covers, etc. An advantage that should not be underestimated, however, is that you can also use containers. whose Parts cannot or should not be reassembled after opening, at all can seal in this way. It is z. B. to containers that consist of butt-abutting parts. Are such containers according to the invention trained, they are airtight and securely closed and can be just as safe and just be opened.

Several exemplary embodiments of the subject matter of the invention are shown in the drawing shown: Fig. 1 shows a partial cross-section through a can-like container with slip-on cover before the welding seam is produced.

Fig. 2 shows the partial cross-section according to Fig. 1 after the weld seam has been produced.

Fig. 3 shows a partial cross-section through a can-like container Screw cap after making the weld, Fig. 4 a can-like container, which is only closed by a weld seam, in partial section.

Fig. 5 the same in elevation and Fig. 6 in plan.

The embodiment according to Fig. 1 and 2 is a box-like one Container of round, angular or other cross-section, consisting of a lower part a and a slip-on lid b consists. The normal shape of the can as it was before. is indicated by a dash-dotted line. It can be seen from this that the lower part a and cover b bead-like thickenings at their abutting edges c have received that terminate in a point d.

The thickenings have the shape of a right-angled in cross-section Triangle, one leg of which is the extension of the front edge e of each of the two Forms parts a and b. When the lid is in place, the two thickenings c together an isosceles triangle, the tip of which is welded and the one from Fig. 2 apparent flattening f results as a weld seam.

In the design according to Fig. 3, the individual parts are the same as in the design according to Fig. 1 and 2, but the cover b is a screw cover educated.

The embodiment according to Fig. 4 to 6 is a box-like one Container that consists of two completely equal parts g consists that butt against each other. These parts g are in the same way with bead-like, pointed thickenings h, the tips of which together are deformed as a weld seam 1. A such a container. the z. B. to keep 5 direibin scbinenl change can not be used as a container again after its contents have been removed. Of course, its individual parts are used for special purposes can be.

Claims (7)

PATENT CLAIMS. 1. Airtight container with a sealable lid made of plastic. characterized in that the container and lid edge at their joint have outwardly tapering bulge-like thickenings. 2. Container according to claim 1, characterized. that the bead of each of the two parts forms a right triangle in cross section, the a cathetus represents the extension of the edge line of the container part in question, the two beads together in cross-section when the container parts meet form a substantially isosceles triangle. 3. Container nadi claim 1 or 2. characterized in that the Bulge-like thickenings are interrupted at one point. 4. Container according to claim 1, 2 or 3, characterized in that the bulge-like thickenings at the top are fused together. 5. Container according to claim 4, characterized gekeniizeichnet. that at the N-ersdiuielzen the \ R7ulstspitzen to each other at a point between the two ridges an opening device, z. B. a coated with a sealing layer Bl echplättchen with to the outside excellent handle. is inserted. 6. Container according to claim 4, characterized in that between the abutting surfaces of the heiden beads a tear cord is inserted, which with a The end protrudes from the welding wire. 7. Container according to claim 3 and 4, characterized in that the The joint formed by the interruption of the beads with a mark of a suitable one Material is pasted over. Considered publications: German Patent Specifications No. 277 620, 589 600. 872 400; Austrian Patent No. 151 074; U.S. Patents No. 2,555,139, 2,285,220.