DE2532406C3 - Method and apparatus for the continuous production of a pipe from a web of a thermoplastic foam - Google Patents

Description

The subject of the invention is one Method and a «: device / to continuous Manufacture of a pipe from a sheet of a 4 »thermoplastic foam by I ornieii der Hahn c | iier / 11 of their length / around pipe (| iicischniii and joining of the Seiteneiikanien iintl afterwards brief noisy heating of the cane egg.

Pipes from Schauiiisloff. thin-walled or thick-walled with smaller or larger diameters are used in particular for isolations / wakes against cold or heat, e.g. B. for the entire sanitary installation such as hot water, cold water. Sewage, llei / iingsleiliingen. Källeleiliingen etc. used. Such pipes can either be exlrudicrl directly from foam. However, it is also possible to manufacture such tubes from foam strips. The latter is particularly suitable for such foams. that cannot be extruded directly. The Schaiiiioffsireifen is V, here as a web product either by extruding with Navhschiiiimcn, such as in cross-linked polyethylene foams or by the coating process, lel / lcrcs /. B. with soft I'V (foam.

Ls is known. To produce pipes from strips of deformable, such as thermoplastic foams, by bending the Schatmisloffslrcifen and flat / folded together, the Slol.lnahl is welded or glued. The resulting hollow cross-section is then pressed on (DL-OS ·> ί I3 7b8). The tubes made of strips in this way, however, do not have a round cross-section. but tend /. " an oval cross-section, which turns out to be particularly disadvantageous if the slot diverges, i.e. is not form-fitting, when the shaped tube is subsequently slid as an assembly aid. Furthermore, there is also the risk that, due to the stresses remaining in the formed pipe, the adhesive or weld seam will partly open again and partly not be connected in a form-fitting manner. In addition, the known method cannot be used to produce thick-walled tubes with smaller tube animals, since lall formation occurs due to painterial leaching and a round cross-section cannot be achieved either.

The task is to find out / ugruiuL ·. a pipe to create / u from a Schaunisioffbahn, that is, too relatively thick-walled tubes even with small tubes can be made from sheets of greater thickness. Also the pipe should after the completed lonning must be free of tension, so that even if the hamlet later heals. Pipe and remains in the Liiisat / the Lormschliissigkcii.

According to the invention, this task is thereby achieved resolved that the unformed path on its later the The side forming the inner pipe ropes briefly until the thermoclaslischcn or thermoplastic state heated and then deformed and cooled before connecting the Scilenkanlcn. These heat treatments, which corresponds approximately to a Tenipcriing, becomes so carried out that dk · noise heating only over one Part of the thickness of the cross section of the path penetrates, where the l'laslifi / ation is only so popular that the Schaiimsloff structure is not destroyed. the I lci / tcnipcraiiir and the idle time depend on the Material of the foam and according to the foam thickness. The step-wise provided according to the invention Heat treatment leads / 11 to a stress-free tube, which even after it is later cut open (l.ängsscliliizen) no longer has the ambition. in his original stripes / back / iislcllcn.

Hamlet is there with the inventive method the transformation in ihcmioelastrdicn / lhcrmoplasii see state possible, even relatively hard foams / 11 hollow bodies with relatively small ones Inside diameters / 11 shapes b / w. small pipe diameter to achieve mil thick walls.

The intended first heat treatment does not only make the spill -.τ the ropes forming the Rohriniienscile the web is tension-free, but at the same time facilitates forming in ilen Kohriiucrschnill. After this Forming in the Kohrqucrschiiill a cooling is carried out at the same time, so that the formed tube After passing through a urine, the urine can solidify and become unstable in shape. Then the reshaped and by cooling again solidified tube pressed in a known manner into an oval cross-section, the long Llippsenachsc horizontally and on the upper line of the vertical short LHipsenachse by welding or gluing / 11 connecting Sloßuahl arranged is. In this way, a perfect concern of the butt joint along its entire I would be enabled and thus a perfect connection can be achieved.

When the tube has cooled after the external heat treatment, it is preferably attached to a The point that does not form the longitudinal seam is slit again in the longitudinal direction. To close this A cileil lock or an adhesive tape with an overlap can be attached to the tube through the slot. That Tube produced in this way is advantageously suitable for the Linsat / / 11 the Isolalioiis / wake. where the Shiit /

an assembly aid and the attached Closures allow easy closing after the pipe has been assembled. The manufactured according to the invention Rohr is free of tension in its foundation and form-fitting.

To carry out the process according to the invention is operated by a device with a revolving hand / to transport the continuously incoming Rooster, a l'ormiriehier. a Finrichlung / um Locking Jer SioUiuiht and a Andriickeinrich- iu ment as well as an I lci / device acting on the outside of the pipe.

I>. | the first heat treatment carried out leads to a relative curvature of the Schaiimsioflbahn, there is a risk that the foam sheet when Transport is lengthened or stretched. In order to avoid these disadvantages, the device is perfect designed so that the conveyor belt has a rough surface, in front of the forming funnel one Ilei / egg direction and after the standard funnel one with a cooling device equipped l'orm tube is arranged. On the rough surface of the conveyor belt the Schaiinisioffbahii is now liable to this The Schaunisioff-cock becomes a wise man avoided and an even transport guaranteed.

After another suggestion the Frfindiing will the device is designed so that the shaped tube at least at the inlet and outlet ends their upper side with a guide ring / designed Jt) is. in the one guide rail to / wipe the side edge !! of the shaped tube can be fed. /.around I! Create a perfect connection of the Sloßnalit are means. /. IJ. Hold-down plates. / to deform the pipe into an oval cross-section in the area J5 the fin direction / around closing the stoUuahl provided. In this way it is achieved that the I laugh at the Sloßnahl flawlessly anciuandcrlicgcn and a rope pressure is exerted on the SloUnahl.

The I-finding is in the drawing on a -to Execution, example shown iiml is based on this explained in more detail below. Fs shows

Fig. I a schematic representation of a device / to create pipes from a Schaumsloffbahii. v>

2 shows a schnialischcn cross section through the 1 line / arrangement according to section AA to 1'ig. I.

lip. J a schematic view of the l'ormiöhre recut // - // according to I ig. I.

l'ig.4 a schematic view through the connection education facility according to Scvtnili Ci according to l'ig. I and

Fig. Ϊ́ a schematic view of the pressing device. S ^ hiiiU D-PimkU l'ig. I.

Mil der in the l'ig. I device shown are foam strips 2 from a tap from a thermoplastic and deformable material, which are wound on Vorralsrolle I, verarheilct to tubes. The strip 2 runs from the supply roll I over the I in-guide roller .1 to the work table 4, on the /. H. a Klevorrichliing 5 is provided. This adhesive device mi ment 5 is required / in order to endlessly join the strips 2 together when changing the roll. From the work table 4, the strip 2 runs through the pair of guide rollers 6, where it runs onto the endless conveyor belt 8. The conveyor belt 8 takes over the auxiliary function for "· the strip 2, for this purpose the conveyor belt 8 has a very rough upper rope. / .. H. as with Emery tape with any grain size. This conveyor belt 8 has good mechanical ventilation / u your Strip 2 on. This is important for you in the following Heat treatment of the .Strip 2 on a mechanical Fesiigkeil abijßi and otherwise there would be a risk that it not evenly miitransportieri or stretched would. The endless conveyor belt 8 is with the strip 2 through the various devices out and is deflected at the F. Ende of the pressing device 20 and over the tensioning roller 17 again / u the Guide roller pair 6 returned. The drive for the conveyor belt 8 takes place via the drive roller. 22.

After the strip 2 rests on the conveyor belt 8 and is transported, the strip 2 runs through the heating device 7. see also the schematic cross section according to FIG. 2. The heating device 7 can with l.ufl. Emitters etc. are operated. Home traversal If the strip 2 is heated on one side, i.e. on its later inner side of the pipe, and in the thermoplastic In addition, the warming only penetrates so that the return cables, the later pipe outside, are so far above the thick cross-section. of the strip 2 ropes, practically still cold and imp! as: ifi / icrt stays and Jen enables mechanical transport and adhesion to the conveyor belt 8. The temperature and the heating time depend on the dimensions of the foam and the thickness of the strip 2. Overall, this is a plasification. i.e. a warming up to the thermoelasiic or transition to the thermoplastic state up to about half the thickness of the Strip 2 desirable, the l'laziifi / ierung in no way because the foam syrup is allowed to go gets destroyed. This heat treatment carried out by the strip 2 as it passes through the heating device 7 experiences, corresponds approximately to tempering. The conveyor belt 8 runs over the worktop U. The room isl through the side shielding plates 4 shielded, so that an even color of the strip in the edge with oak ensured M.

Which partially warmed up to / tir l'lastifi / icrung After leaving the heating device 7, the strip 2 is dei Finrichliing / um reshaping in ilen Kohrqucrschniti Here, the strip 2 runs into the Forniirichler IO. of him / ti the Rohtuuerschnitl reshaped. At ilen Formirichler 10 directly follows the Form tube 14, but the top at least in Ijnlaiifbereich and also at the end of the run with the l'ührungsschlil / 14; / trained isl. as well as from the schematic cross section according to FIG. i can be seen. In This guide key 14.7 engages at least in the fin run area the guide rail 12. which at the same time engages in the joint of the strip 2 formed into the tube 2. / and these marked so that a twisting of the geionn'cn Pipe is avoided in the subsequent further transport. The l'orm tube 14 is also included the cooling device 11 is provided, with Kiih'luft in the l'ormröhre 14 is blown. In this way is; secure. that the formed into the pipe 2.7 Strip 2 cools down again to room temperature as it passes through the Formröhrc 14 and solidifies. Even the hand 18 is inserted into the l'orm tube (4 and adapts to the rounding of the form tube 14, whereby a pressure of the shaped tube. ·; 2.7 on that Conveyor belt 8 is exercised, so that despite the friction in the forming tube 14 a perfect Transportation takes place. The width of the conveyor belt 8 can be significantly smaller than the width of the strip 2 be, for example, a quarter to a third of the same

concerned. On the lndc of the roller blind 14, a cross section of the tunnel in the tunnel can still be ziigcschweißtcn

Leadership roles must be arranged, but this is not seen in Koines 2 / '/ n. del one hand diireh the

absolutely necessary and is based on the side adjustable llegrcnzimg 21 and on the other hand

Schauinsloffrohi to be produced. | eilocli isl es / wake up by the upper and lower hand 2f).;. Λ dci

Moderately a permanent, pressing device is also required in the discharge area

Rail 15 to be provided, which into the seam of the die I iihrungsrollcn 2 V that of the pressure device

shaped pipe 2 .; intervening and a twisting read 20 are nachgcorilnet, the Aulgabi can at the same time

Pipe 2 ;; prevented. take over, press the male pipe 2 / '

This is also why liedeuliing. damn to round them up again. Then the second I leizeinncli follows

Sloßnhl des Kohles 2,1 always at the same SuIk as in ium: 24. the the outside temperature of the Kohl 2h

The tube 14 is lengthened and in this position the heating device 24 according to Diuehliihn Keim Diiu'hl.n · ίι the heating device 24

following execution to close ilei Sloßnahl the cabbage is 2 / 'on its outer surface up to / in

can be fed. l'la lamination of the outer ll.iui ei warms | edoi Ii inn

The pipe, which is still open, can now w ew for a short time, so that the sch.iumsiolfsinikliir receive

Rehabilitation treatments, such as ti remains. This heat treatment is the

Welding the butt joint. Gluing the Sioßnalil. last faded in the tube 2b in the outer layer

Covering with an I olie with adhesive edge. Welding new tensions aiisgeteniperl. so there is no tension

one (üeiiverschiusses etc. in the shown Aiisiiiii gen in the Κοίιι 2i> zuiiu kiiii-iiieu. die dasseine / um

For example, you can see a welding shape 14 flat strips ziirucksielleii u.llen. After this

for welding the stolina seam of the shaped tube 20 leaving the heating device 24, the cabbage is 2h

2.1 at. as well as from the cross-section to Γ ig. 4 / u cooled down again, for example by d.is

is seen. In order to ensure proper welding of the cooling tube 27, the cooling roller 27 can be used at

To get the butt joint, the preformed tube 2.ι is operated for example by means of cooling air that is passed over

the handling is returned for 2 hours between an upper and lined hold-down plate. Before the

18.7. b out, which the pipe 2n in an oval cross 2> cooling pipe 27 isl expediently a turn 25

Press cut, with the long I-Hipsenachsc arranged horizontally. the perfect feeding

is arranged right. The bottom seam of the deeply formed raw of the K,; '. Illuft ensures. The cooling pipe 27 can

res 2.7 lies on top, so that the lleizschwerl can be exchanged and π its diameter

. Welding device 19 engages in the butt seam and adapted to the respective pipes to be produced 2Λ

Curses plasticized so that they weld together. Des χι become. The further removal of the pipe 2 /> ge

there are also lateral adjustable stirring layers over the take-off rollers 2 ¹ ^. those about the drive

36 intended as Sciienbegrenzimg. In this Jl are driven and the top-side swivel

squeezed oval Queiscliniuslnim becomes bare takeaway roll 28. In this area can

the pipe 2Λ welded shut at the joint directly into, for example, a separating device, in (iestali de

the pressing device 20 introduced.die aiii a vor- r> rotiert.nden l.angstrennmesser 50 be arranged, the

given distance the pipe 2 / 'in tier voigege- dasgeschweilliewarmebchanilelieunilersiiirneUoln ^ /'

benen position holds until the weld is solidified. at a point that does not correspond to the Sloltnahl, in

At the end of the pressing device, the hand 8 slits lengthways, / slits around waste liquors

the pipe 2b withdrawn and / to exit back pipe 2c is the l't'ihrung 12th, for example, a

out, while by means of the Rihriingsmllen 2} of the 40 Ijihningsbuchsc provided to which the Querlrenn

Wi * iii »rir: inmiM-i Hot R.ilir.'t Jh zn, ι, · ι · Miii-lifiiK'i'iuli'n knife ?? connects. The deflected pieces of pipe

llei / establishment 24 takes place. are via tlie tilting device 54 for storage

In the Γ i g. 5 is a cross section taken through tlie.
Pressing device 20 shown, the oval

For this purpose 3 sheets of drawings

Claims (3)

l'atenuinsprikhe. 1. Process for the continuous production of a pipe from a tap from a thermoplastic foam by shaping the web transversely / u "> its longitudinal extension to the pipe cross-section and connecting the side edge!) And then briefly heating the outside of the pipe. El a characterized by that the undeformed web on its side that will later form the inside of the pipe, it is briefly heated to the iherinoelastic or thermoplastic state and then formed and cooled before the side edges are joined. 2. Device for performing the method ΐί according to claim I. with a revolving belt for transporting the continuously approaching track, a Lormtrichicr. one Hin Direction to close the SloUnahl and a pressure device as well as one on the RuhrauUcn- towards ropes a heating device, thereby marked, d: iU the transnon tape (8) has a rough surface, in front of the l'oriiitrichler (10) a heating device (7) and after the IOrmirichier (10) a cooling device (I I) configured Lormröhrc (l4) is arranged. 3. Apparatus according to claim 2, characterized in that the lOrniröhrc (14) is formed at least on the inlet and Ausi.nifseiligcn linden tree on its ear cue with a guide felt ( I4; i) in J ₀ ilen a guide rail (IS) to / wipe the. rope edges of the formed tube (2 ;; Jciiifiihrhar is.