DE1479867C

DE1479867C - Process for the production of cross-bottom valve bags made of thermoplastic material

Info

Publication number: DE1479867C
Application number: DE19651479867
Authority: DE
Inventors: Kurt 4540 Lengerich Rochla
Original assignee: Windmoeller and Hoelscher KG
Current assignee: Windmoeller and Hoelscher KG
Priority date: 1965-10-04
Filing date: 1965-10-04
Publication date: 1973-02-08

Description

Fig. 12 einen Schnitt nach der Linie XII-XII der Fig. 11,12 shows a section along the line XII-XII of Fig. 11,

Fig. 13 den fertigen Sack und13 shows the finished sack and

Fig. 14 einen Schnitt nach der Linie XIV-XIV der Fig. 13.FIG. 14 shows a section along the line XIV-XIV in FIG. 13.

Als Ausgangsmaterial für den herzustellenden Kreuzboden-Ventilsack aus schweißbarem Material gemäß Fig. 13 und 14 dient wie bei den bekannten Kreuzboden-Ventilsäcken ein Kunststoffschlauchbahnabschnitt 1 (Fig. 1 und 2). Dieser Abschnitt wird während seines kontinuierlichen Weitertransportes quer zur Schlauchlängsrichtung weiterverarbeitet. Zunächst werden seine beiden Enden unter Bildung von Eckeinschlägen 2 bis 5 zu Bodensechsecken aufgezogen und flachgelegt (Fig. 3 und 4). Den nächsten Verfahrensschritt bildet das Heranbringen und Anschweißen einer Ventileinlage 6 an den Eckeinschlag 2. Gemäß der vorliegenden Erfindung wird ein sich quer zur Transportrichtung des Sackwerkstücks erstreckender Kunststoffstrang 7 im heißen Zustand auf den Eckeinschlag 2 gebracht und anschließend durch die Ventileinlage abgedeckt. Durch die dem Kunststoff strang innewohnende Wärme schmelzen die' Teile, gegebenenfalls bei gleichzeitiger Druckanwendung, zusammen. Bisher ließ sich die Ventileinlage bei Anwendung des Sackwerkstücks an den Eckeinschlag anschweißen. Eine zum Auftragen eines heißen, sich quer zur Werkstücktransportrichtung erstreckenden Kunststoffstranges geeignete Vorrichtung ist beispielsweise in dem älteren Patent 1 236 952 der Erfindung gezeigt.As the starting material for the cross-bottom valve bag to be manufactured from weldable material 13 and 14 is used as in the known Cross-bottom valve bags a plastic tubular web section 1 (Fig. 1 and 2). this section is processed during its continuous further transport transversely to the length of the hose. First of all, its two ends become bottom hexagons, forming corner incisions 2 to 5 raised and laid flat (Figs. 3 and 4). The next step in the process is bringing them in and welding a valve insert 6 to the corner fillet 2. According to the present invention is a transverse to the transport direction of the sack workpiece extending plastic strand 7 in brought hot state to the corner impact 2 and then covered by the valve insert. Due to the heat inherent in the plastic strand, the 'parts melt if necessary simultaneous pressure application, together. Previously, the valve insert could be welded to the corner when using the sack workpiece. One for applying a hot plastic strand extending transversely to the workpiece transport direction suitable apparatus is shown, for example, in prior patent 1,236,952 of the invention.

Der nächste Verfahrensschritt bei der Herstellung des Kreuzboden-Ventilsacks besteht im Auftragen eines heißen Kunststoffstranges 8 auf den Eckeinschlag 4. Anschließend erfolgt das Heranbringen jeweils eines Bodenblattes 9 bzw. 10 an die aufgezogenen Schlauchstückenden. Der Kunststoffstrang 8 wird durch das in Transportrichtung gesehen vordere Ende des Bodenblattes 10 abgedeckt. Während des Heranbringens der Bodenblätter wird jeweils ein weiterer heißer Kunststoffstrang 11, 12 auf die Eckeinschläge 3,5 aufgebracht. Unmittelbar nach dem Aufbringen der Kunststoffstränge 11; 12 . werden diese durch die in Transportrichtung gesehen hinteren Enden der Bodenblätter abgedeckt. Ebenso wie der Kunststoffstrang 7 bewirken auch die Kunststoffstränge 8,11 und 12 das gewünschte Verschweißen jeweils zweier Materiallagen miteinanderThe next step in the production of the cross-bottom valve bag is application a hot plastic strand 8 on the corner fold 4. Then it is brought up one bottom sheet 9 and 10 each to the drawn-out tube piece ends. The plastic strand 8 is covered by the front end of the base sheet 10 as seen in the transport direction. During the When the bottom sheets are brought up, a further hot plastic strand 11, 12 is applied to the corner folds 3.5 applied. Immediately after the application of the plastic strands 11; 12th will this is covered by the rear ends of the floor sheets seen in the transport direction. as well like the plastic strand 7, the plastic strands 8, 11 and 12 also bring about the desired welding two layers of material with each other

ίο (Fig. 8). · . . ■ίο (Fig. 8). ·. . ■

Der nächste Verfahrensschritt besteht im Herstellen einer Bodenlängsnaht 13 bzw. 14 jedes Sackbodens. Die Schweißnähte 13,14 können in bekannter Weise Preß- oder Schmelzschweißnähte sein.The next process step consists in producing a longitudinal bottom seam 13 or 14 of each bag bottom. The weld seams 13, 14 can be pressure or fusion weld seams in a known manner.

Gegebenenfalls ist es vorteilhaft, vor dem Herstellen der Schweißnähte 13,14 die Ränder der miteinander zu verschweißenden Lagen zu besäumen.It may be advantageous, before the welding seams 13, 14 are produced, to joint the edges of the to be trimmed layers to be welded.

Nach dem Herstellen der Schweißnähte 13,14 werden, während des Weitertransportes des Sack-Werkstücks beide Böden in an sich bekannter Weise um 180° herumgeschwenkt, so daß nunmeh'r die noch nicht zugeschweißten Längsränder der Böden außen liegen. Anschließend werden dann dieBoden-After the welding seams 13, 14 have been produced during the further transport of the sack workpiece both floors pivoted around 180 ° in a known manner, so that now the Long edges of the floors that have not yet been welded shut are on the outside. Then the floor

■ lärigsnähte 15,16 hergestellt, die ebenso wie die Nähte 13,14 Preß- oder Schmelzschweißnähte sein können. Vor dem Herstellen der Nähte 15,16 können auch an dieser Bodenseite die miteinander zu verschweißenden Ränder noch besäumt worden sein.■ larig seams 15,16 produced, just like the Seams 13, 14 can be pressure or fusion welds. Before making the seams 15,16 can the edges to be welded together have also been trimmed on this bottom side being.

Mit Fertigstellung der Bodenlängsnähte 15,16 ist der -Kreuzboden.-Ventilsack endgültig fertiggestellt.With the completion of the longitudinal bottom seams 15, 16, the cross-bottom valve bag is finally completed.

Die Bodenlängsnähte 13 bis 16 lassen sich, ohneThe bottom longitudinal seams 13 to 16 can be, without

dadurch die Herstellungsmaschine zu komplizieren und zu verteuern, vielmehr unter Verkürzung derselben um eine Schweißstationslänge, auch gleichzeitig herstellen, wenn die beiden Böden vorher in an sich bekannter Weise um 90° herumgeschwenkt werden, so daß sie bei horizontalem Transport der Sackwerkstücke in vertikalen Ebenen liegen.thereby complicating the manufacturing machine and making it more expensive, rather by shortening the same around a welding station length, also at the same time, if the two floors were previously in be pivoted around 90 ° in a known manner, so that they can be transported horizontally Bag workpieces lie in vertical planes.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 21 2

ρ, melted, creating an intimate connection between the

Claim: both layers, possibly with additional ones

Method for making cross-bottoms- application of pressure.

Valve bags made of thermoplastic material It has been known for a long time from

in the cross-conveying process, in which hoses are attached to a 5 single-layer plastic webs as a result of this hose section the ends drawn up and delivered so that a continuously extruded hot on the drawn ends bottom sheets on- plastic strand welded between the overlap each other at a corner between the edges of the 'turned back on itself' see the corner impact and the bottom sheet plastic sheeting is brought.

·> A valve insert is welded in, but according to the present invention characterized in that the hose seams not lying in the workpiece transport direction, sections during the pulling up of their ends but transversely to this direction and welding on the valve liners and connecting seams by applying the molten material of the base sheets continuously conveyed transversely made of plastic. Such seams and the connecting seams between the floor 15 were still in the known method in Corner impacts, the base sheets and that of the conventional and thus an intermittent valve insert produced by each one in molten the operation required way. Invention state between the parts to be welded according to the invention, however, it was recognized that just at brought plastic application are formed. Generation of the run transversely to the conveying direction.

20 the connecting seams by melting together by means of a melted open-

th plastic achieved special advantages on sluggish

because the heat of welding is no longer Ψ for a certain period of time

The invention relates to a method of manufacturing 25 or the like must be supplied by welding jaws, len of cross-bottom valve bags from thermo but only the melted plastic application plastic plastic in the transverse conveying process, preferably by means of a rotating tool to which the ends are to be applied to a hose section, for which purpose only a very brief one pulled and pulled up on the ends of the ground leaves contact between the tool and the itself be welded on, whereby at one corner between moving hose work pieces is required, see the corner entry and the bottom sheet one while then-who continues with the workpiece Valve insert is welded. moving molten plastic strand, in wel-

The chem the necessary welding heat so far produced by this process is stored, Plastic valve sacks have the essential effect of creating the desired weld. The in-work disadvantage, that they are not weld seams running in a continuous piece transport direction Working methods and thus not so cheap to produce, on the other hand, are still using the conventional, as it is attached to a lost packaging they borrowed welding process usually is necessary. For this reason, for example, with the aid of radiant heating they have not yet acquired the market share elements and subsequent press rollers, 40 A device with which the plastic itself would be appropriate. Until now, orders could be placed in the hot state across the sack workpiece can be applied transversely to the conveying direction of welding transport direction is sewed only while the sack factory was at a standstill - for example in the earlier patent 1296 352 of the Produce pieces, the invention being described with one another. * (

welded layers of material through the 45 In the following description is on hand Positioning machine provided welding jaws or the drawings the method according to the invention the same heat was applied. . and the produced in the method according to the invention

Therefore, the present invention is the up-turned plastic valve bag described in detail, would be based on the initially described method I _n the drawing shows ■ ~

designed so that the plastic valve bags in 50 F i g. 1 as a starting material for manufacturing a continuous working process and thus the sack is laid flat plastic can be produced as economically as possible - hose web section,

nen that they are with the other known plastic F i g. 2 shows a section along the line II-II of

sag in competition. Fig. 1,.

This task is described at the beginning in the section according to FIG. 1 with the floor planes Manufacturing process solved by the fact that the hexagons raised and recessed ends, Hose sections during the drawing up of their Fig. 4 is a section along the line IV-IV of the

Ends and the welding of the valve inserts Fig. 3,

and the ground blooms continuously conveyed across F i g. 5 shows the section according to FIG. 3 with on the valve

and the connecting seams between the valve sheet provided at the bottom 60, Corner impacts, the base sheets and the valve F i g. 6 and 7 sections along lines VI-VI and

insert by one each in the molten state VI-VII of Fig. 5,

8 brought the section according to FIG. 5 after the parts to be welded between the parts to be welded

Plastic application are formed. By applying the soil sheets,

Melting temperature located, linearly up- 65 ρ ig. 9 and 10 sections along lines IX-IX brought plastic application the two with and X-X of the Fig. 8th,

layers to be connected to one another in the area of FIG. 11 melt the sack in a further manufacturing process Plastic order also pending,