DE2145785A1 - Process and system for the production of cups for holding liquid substances - Google Patents

Description

2U5785

Dim . H. 3bp, 1971

B moon. ^ I 121-. '. '■, ..,
^r slefoii f '■ j /, · _ ■

- V

Etablissements Clement Pontneau-Pontneau-Plastic Soustons, Landes (France)

"Process and system for the production of cups for recording ι

liquid substances "j

Priority from September 15, 1970 from the ι

French patent application. . .70 / 33 34-1. . ■

The invention relates to a method and a system for the production of frustoconical cups, the opening of which is on the side of the smaller base of the truncated cone. The two parts of the cup, bottom and body, are made up Thermoplastic films produced after they have softened, namely by compression molding in a vacuum and in a die in general truncated cone shape with constant slope; the one part • Ie, which are deep-drawn, form cups from which the bottom is cut out is used to form the body of the cup, the other, less deep parts form capsules that form the bottoms of this Form cups, after which the two parts of the cup on the Drehj able welding machine can be assembled.

Was used to drive the floor through the welder. proposed an edge zone of the side wall of the cup to be provided with fine spikes or waves, the cavities or raised points of which run axially. This edge zone serves with a corresponding molded part of the welding machine

2 09817/0 77 for ¹ "

ν - - ^ - ' ^Q C5RIGINAL INSPECTED

2U5785

ten. In contrast, it occasionally happens that when there is a shift between the teeth or recesses of the floor and those of the welding machine the floor is in an incorrect position gets into the welding machine so that the weld is not perfect is performed.

The aim of the invention is therefore to eliminate this disadvantage.

According to the invention are the welding machine and the bottom of the cup equipped with guide surfaces that allow a conical and smooth joining, while the opposing surfaces * the bottom and the welding machine are equipped with gripping teeth that work together.

In the direction of their mutual support, these teeth preferably have flat flanks which are perpendicular to the surfaces run of the floor and the welding machine; the flanks are inclined in the opposite direction. The two flanks of each ver: serration can be connected to one another directly along an edge, so that the profile of the teeth is advantageously a; Triangular shape results.

Based on the attached drawings, the inventive, moderate structure easy to recognize. Show it: ;

- Fig. 1 - a plan view of the designed according to the invention

r soil; j

- Fig. 2 - an enlarged sectional view according to II-II of Figure 1;

- Fig. 3 - a sectional view according to III - III of Fig. 1 ''

of the bottom placed on the drive head;

Figure 4 is a sectional view of the finished cup The bottom 5 shown in these figures serves to close the large open base of a truncated cone-shaped cup body £; i + of the type shown in Figure 1. This bottom has an edge portion 6, which with the help of a welding machine against the inner Edge of the cup shape is welded and also a truncated cone shaped and smooth part 20, the opposite of the aforementioned Part stands back and serves to center the ground, which takes place on a head part 21. - - 3 -

0f

BAD ORJ (S (NAL

2U5785

For this purpose, the edge of this head is also frustoconical and smooth and has the same angle at the top as the part 20, only a slightly smaller one Diameter.

The surface of the bottom is equipped with prongs 22 of a triangular profile, which are punched out of the plastic film are. This creates a flank 22a which runs perpendicular to the surface of the base and an inclined flank 22b.

The welding mold 21 has teeth 23 whose shape with the

22nd
of the teeth coincide and whose height is selected to be slightly larger, the teeth being aligned in the shape that the edges 23a of these teeth of the teeth in the opposite direction 22 DES bottom in the direction indicated by the arrow F direction of rotation of the flanks 22a ^sin * In addition, when The height of the section 20 is selected to be greater than the height of the existing teeth 22.

Thus, if a base is placed on the welding mold 21 in any way, then this becomes due to the interaction exactly centered between the part 20 and the edge of the weld mold.

Generally, teeth 22 are sandwiched between teeth 23 of the weld mold. Thus the surface of the bottom turned towards the welding shape lies directly on the upper edge of the teeth 23 and the teeth 23 lie against the teeth 22 due to their persistence. so their inclined flanks 22b, 23b touch each other (see line 21a in Figure 2) and push against each other until, as already previously, the outer surface of the bottom touches the edge of teeth 23 and teeth 2 2 and 2 3 engage.

By turning the welding mold with a predetermined force

This results in a perfect weld j in every case between the bottom and the body of the cup.

The invention extends to the welding of the bottom of cups with counter-tapering, which are used for packaging liquid or paste-like products.

209817/0773

Claims (1)

_ γ Etablissements Clement Pontneau-Pontneau-Plastic Soustons, Landes (France) Patent claims: Process for the production of frustoconical transport cups, the opening of which is on the side of the small base of the truncated cone, by welding a base and a cup body made of plastic film on a rotating welding device, the base and body having frustoconical sections which are pushed into one another can, characterized in that the welding mold (21) and the bottom (5) are equipped with conical, smooth guide surfaces for pushing together, while the bottom. - (5) and the welding form (21) opposite surfaces are equipped with teeth (22, 23) which mesh with one another. Method according to claim 1, characterized in that the Teeth (22) of the bottom (5) and the teeth (23) of the welding mold (21) have flat flanks in the direction of their mutual support, which are perpendicular to the surfaces of the base (5) and the welding mold (21) run, with inclined flanks being provided in the opposite direction. Method according to Claim 2, characterized in that the teeth of the base (5) and of the welding mold (21) are triangular Exhibit frcfil. Method according to one of the preceding claims, characterized in that the angular distance av.'ischen two successive, successive teeth is substantially ^{greater than the V 7} : angle width of a tooth. 2 U «β.I 7 / .07.7 S bad 5. The method according to claim 1, characterized in that the height of the teeth of the welding mold (21) above that of the teeth of the Bottom (5). 6. Plant for the production or assembly of a base and a cup body with opposite tapering, whereby the base and the cup body are made of fusible material with the help of a vertically standing welding mold, which rotates at a certain speed and with the aid of which the method according to the invention according to one of the preceding claims can be carried out, characterized in that the welding mold (21) for receiving the bottom (5) with a smooth, frustoconical surface is equipped and on its upper side has teeth for grasping the base (5), which preferably run radially and have a triangular profile own. ^ • ^ -iO38 i 7/07 73