Process for making container of plastified sheet material and container obtained with this process

Abstract: Process for making a container (1) of heat-sealable plasticized sheet material, provided with a pouring spout (11), said container being formed of a pair of facing walls (2,3) having two side edges connected to each other by means of side walls (4,5) folded to create side bellows, said process characterized in that it comprises the steps of: sealing the upper edges (6,7) of said facing walls (2,3) so as to define an opening (9); providing a small tube (12) of a rigid material fitted with a flange (14;16) that extend wider than said opening (9) and that defines said spout (11) and a thin cane (10); inserting said thin cane (10) into said container (1) through said opening (9) till said flange (14;16) meets the border of said upper sealed edges (6,7); folding said flange (14;16) on the outer faces of said facing walls (2,3) to cover said edges (6,7); tight sealing said flange (14;16) to said edges (6,7).

Description: The object of the present invention is a process for making containers in plasticized sheet material provided with a pouring spout, as well as the container obtained with this process. On the market, containers exist made of plasticized sheet material comprising two facing walls whose side edges are connected by side walls. The side walls are folded down middle between the facing walls so as to make two side bellows which, during the filling operation, allow the container to expand to assume a pseudo-prismatic shape suitable to allow the container to stand up when it is placed on a flat surface. The container is provided with a spout which allows the liquid inside the container to be poured and sipped; this spout is made up of a thin cane of a rigid plastic material which is inserted between the two edges where the two facing walls of the container join at the top. The closure of the container is made by sealing the two edges to each other and around the thin cane. For instance, the document US-A-4,718,778 discloses a liquid container made of a flexible film with a delivery device attached to the container so that the conduit portion, a thin cane, of this device extends into the interior of the container while its outside portion, the mouthpiece, has a screwed cap thereon. It is also disclosed that the cylindrical wall of the conduit portion, adjacent to the sealed top of the container, has an opening that is closed by the wall of the flexible container, when the delivery device is used as a straw. When the content in the container is poured into another liquid receptacle, the opening is used as an inlet so that the content of the container can be completely emptied. A drawback of this container is that its upper closure, the sealing between the upper edges and the interposed thin cane, is not protected against the pollution or the bacterial attach that in some cases could reach the product packaged into the container. Another drawback of the present container is that its closure causes a notable percentage of waste which makes the container economically disadvantageous. In fact retaining deficiencies have frequently been found in similar containers, in the sealing area next to the spout, which often remain invisible while the container is manufactured but are noted during the subsequent filling phase. Therefore the technical task of the present invention is to propose a new process to avoid the above-mentioned drawbacks characteristic of the current manufacturing techniques. This task is achieved with a process for making a container of heat-sealable plasticised sheet material, provided with a pouring spout, said container being formed of a pair of facing walls having two side edges connected to each other by means of side walls folded to create side bellows, said spout being defined by a small tube having a thin hollow cane connected thereto, said process comprising the characterising steps of claim 1. The purpose of the present invention is also to devise a container which can be made with said new process. The purpose is achieved with a container of heat-sealable plasticised sheet material provided with a pouring spout and formed of a pair of facing walls having two side edges which are sealed to side walls folded to create side bellows and having two upper edges sealed each other, said spout being defined by a small tube having a thin hollow cane connected thereto and jutting inside said container through said sealed edges and characterised by the features defined in the characterising portion of claim 3. The invention will be described and explained in detail in the following description, in which further particularities will result, with reference to the enclosed drawings, in which: Figure 1 shows a perspective view of a container during a manufacturing step; Figure 2 shows the container; Figure 3 shows a sectional view along the line III-III of Figure 2; Figure 4 shows a perspective view of another embodiment of the container. With reference to the figures 1 to 3, reference numeral 1 indicates a container which includes two facing walls 2,3 between the edges of which two side walls 4,5 are placed. Both facing walls 2,3 and side walls 4,5 are made of flexible sheet material. In particular said sheet material may be formed of one or more layers of which the one that remains inside the container is heat-sealable. The said walls 4,5 are folded down the middle so as to create a kind of bellows which allow the container to expand as it is being filled with the beverage and to assume a parallelepipedal shape. The manufacturing technique of said containers is already known so it will not be described further in detail since it does not constitute the object of the present invention. An important element of the present invention is the previous joining of the upper edges 6, 7 of the walls 2, 3 by making a seal 8 to close the container except for a central area in which is defined an opening 9. The thin cane 10 of a small tube 12 made of plastic material sufficiently stiff for the purpose of the present invention is inserted through said opening. The thin cane 10 is separated from a spout 11 by means of a collar 13 forming a single block with the same thin cane. The spout 11 is provided with an outer thread for the screwing of a closing cap. On the collar 13 a rectangular piece of sheet material is applied so as to obtain a flange 14. The flange material is suitable to be sealed onto the outer surfaces of the walls 2, 3. In this way, after having inserted the thin cane 10 through the opening 9 till the borders of the edges 6, 7 meet under the collar 13 and after having folded the side flaps of the flange 14 onto the outer faces of the walls of the edges 6, 7, it is possible to seal said flaps to the upper edges 6, 7 so obtaining a perfectly hermetically-sealed container. In this way the described invention perfectly fulfils the established purposes. In particular the flange 14 allows a sealing line to be made which is able to guarantee a perfect seal by joining two sheet materials that have a thermal compatibility. One advantage is that the collar 13 allows the edges 6, 7 of the walls 2, 3 to be kept away from the thin cane 10, in such a way to make the complete emptying of the container easier through pouring slots 15 which are made in the thin cane, immediately under the collar 13. An advantage of this invention must be seen in the fact that the opening 9, which is very small in size, prevents the liquid from escaping when the containers are filled before joining the small tube 12. Moreover, according to an embodiment of the present invention shown in Figure 4, it is possible to integrally seal, by means of a seal 8, the upper edges 6, 7 of the walls 2, 3 to each other except for an intermediate area 21. Taking away the upper marginal part 22 of the seal 8, an opening 9 is defined between the two flaps of the area 21 , said opening is closed along its bottom by a thin sealing strip 23. In fact this central area 21 does not exceed up the entire height of the seal 8. This determines the formation of a completely-sealed and liquid-tight container, but the application of the small tube is still possible by making one end of the thin cane in a point-shape and punching the sealing strip 23.

Claims: Process for making a container (1) of heat-sealable plasticised sheet material, provided with a pouring spout (11), in which container is formed of a pair of facing walls (2,3) having two side edges which are connected to each other by means of side walls (4,5) folded to create side bellows, said spout (11) being provided as a small tube (12) having a thin hollow cane (10) connected thereto, said process characterised in that it comprises the steps of: sealing the upper edges (6,7), by means of a seal (8), of said facing walls (2,3) so as to define an opening (9); providing said small tube (12) with a collar (13) integral thereto and onto which is applied a rectangular sheet material so as to obtain a flange (14) extending wider than said opening (9); inserting said thin hollow cane (10) into said container (1) through said opening (9) till said collar (13) meets the outer border of said opening (9) and said flange (14) meets the border of said upper sealed edges (6,7); folding said collar (13) and said flange (14) onto the outer faces of said facing walls (2,3) to cover said edges (6,7); tightly sealing said collar (13) and said flange (14) to said edges (6,7). Process according to claim 1, characterised in that said upper edges (6,7) are sealed together except for a central area (21) not extending up the entire height of said seal (8), and that a marginal part (22) of this latter is taken away so that the flaps of said central area (21) define an opening (9) closed by a thin sealing strip (23) and that said thin cane (10) is inserted into said container (1) through said opening (9) by perforating said sealing strip (23). Container of heat-sealable plasticised sheet material, provided with a pouring spout (11) and formed of a pair of facing walls (2,3) having two side edges connected to each other by means of side walls (4,5) folded to create side bellows, and having two upper edges (6,7) sealed each other, said spout (11) being defined by a small tube (12) provided with a collar (13) integral thereto and having a thin hollow cane (10) connected thereto and inserted inside said container (1) through an opening (9) of said sealed edges (6,7), said container (1) characterised in that rectangular sheet material is applied onto said collar (13) so as to obtain a flange (14) extending wider than said opening (9), said thin hollow cane (10) inserted into said container (1) through said opening (9) such that said collar (13) meets the outer border of this latter and said flange (14) meets the border of said upper sealed edges (6,7), said collar (13) and said flange (14) being folded over the outer faces of said facing walls (2,3) to cover said edges (6,7) so as to tightly seal said collar (13) and said flange (14) to said edges (6,7). Container according to claim 3 characterised in that said thin cane (10) is provided with at least one pouring slot (15) near the said collar (13) so as to easier the complete emptying of the said container (1).

Inventors: BELLOLI GIANPAOLO, BELLOLI, GIANPAOLO
Applicants: BELLOLI GIANPAOLO, BELLOLI, GIANPAOLO
Application year: 1995
Main classification: B65D75
IPC codes: B65D75, A61J1