WO2001051271A1 - Device and method for producing tubes - Google Patents

Abstract

The invention relates to a device and a method for producing tubes from a thermoplastic synthetic material, a material containing a thermoplastic, or a composite material with a thermoplastic coating, whose sides are welded together along a longitudinal seam. According to the invention, a pulling system is used to lay a planar tube material around a hollow fill-profile (5) with the help of a moulding slot or a moulding ring and said material is transported to a welding device (1) located on the hollow fill-profile (5). The invention aims to provide a simply constructed device which increases the speed of production whilst maintaining a sufficiently high quality. To this end, the welding device (1) consists of a heating strip (2) which is aligned parallel to the direction of transport of the tube material. Said strip is flat and level in the contact zone of the edges which are to be welded. The heating strip (2) consists of an electrically conductive material and is connected to an adjustable electric energy supply.

Description

 Device and method for manufacturing hoses

The invention relates to a device and a method for producing hoses according to the preambles of claims 1 and 18. It can be used for various purposes, such as e.g. in packaging technology, textile and plastics technology and especially for the manufacture of tubular bags. For the latter application, a device according to the invention can also be designed as a tubular bag form, fill and seal machine, if corresponding additional ones

Machine components are used for the shaping, filling and closing of hoses produced according to the invention or a conventional tubular bag machine is equipped accordingly.

As a rule, a device according to the invention and a corresponding method are operated rather continuously, but it can also be used for intermittent manufacturing processes.

According to the prior art, a suitable starting material is used in rolled form, as a web in the form of a corresponding preliminary product. For the manufacture of tubes or tubular bags, two opposite edges of such a web must be connected to one another by a welding or sealing process, so that a tight and tight longitudinal seam can be obtained as a connection.

For example, DE 197 43 158 AI describes a tube forming device in a tubular bag machine. For the production of the longitudinal seam such a tube or such a tubular bag, the so-called packaging tape is placed around a shaped tube and transported along its surface, opposite edge regions of such a packaging tape being placed inside against the inside, and with a radiator, in which an electrical resistance wire, which is U-shaped and is arranged between two thin heat-resistant strips with a low coefficient of friction, the edge region, in which at least one sealing compound is present, is heated. In this way, a tight longitudinal seam can be produced while the packaging is being transported further.

According to the teaching described there, such a radiator should be arranged at least between two edges to be connected to one another, but in preferred embodiments additional, appropriately designed radiators should also be used on the outside at the two edges in order to achieve the necessary for the production of such a connection Enter heat energy.

With a radiator designed in this way, although a relatively high manufacturing effort is required for this, in particular at high feed speeds of the packaging material in the time available for this, the required temperatures cannot easily be reached in order to establish a secure connection for the production of the longitudinal seam to reach.

Furthermore, this solution is only suitable for the formation of so-called "fin seams" and other seam shapes, such as overlap and fold seams, can cannot be easily produced.

In addition, for the establishment of the connection in the edge area, pressure exerted from two opposite sides is absolutely necessary, so that an increased effort is also recorded here.

It is known that such machines also place high demands on the fume cupboard systems that are used for the transport of the respective packaging material, since even the smallest angle or speed deviations have an extremely disadvantageous effect and can lead to rejects.

Conventional machines usually use extraction systems which are arranged diametrically opposite one another and the welding device which is otherwise also required is then generally arranged at an angle of 90 ° with respect to the two extraction systems arranged opposite one another. As a result of the loading of packaging materials during transport, there may be quality defects when the edges are connected.

With conventional machines, feed speeds of up to 0.5 m / s can be achieved with sufficient quality of the required seam formation, so that the productivity of such a machine is limited accordingly.

It is therefore an object of the invention to propose a device and a method which, with a simple structure, enables a substantial increase in the production speed while at the same time being of sufficient quality. According to the invention, this object is achieved with the features of claim 1 for a device according to the invention and the features of claim 22 for a corresponding method. Advantageous embodiments and developments of the invention result from the features mentioned in the subordinate claims.

With the device according to the invention, a wide variety of starting materials, for example a thermoplastic, such a material containing such a plastic or a composite material which is coated with a thermoplastic coating, at least in the edge regions to be welded together, can be used. The coating can also be a lamination applied to another material. Such a thermoplastic material can e.g. are polyethylene, but also other plastics. The material can also be a corresponding woven or knitted fabric.

As already described in the description of the prior art, the starting material can be designed and used like a conventional packaging material, so that it can be fed using a withdrawal system by means of a hollow filling profile, through which the filling material can also be fed at the same time in the case of tubular bags , placed and transported to a welding device arranged on such a hollow filling profile.

In contrast to the known prior art, a very simply constructed and very easy-to-use welding device is used, which is able to to achieve a sufficiently high heating of the edges of the tube material or packaging material to be welded to one another in a relatively short time, so that the feed rate can be increased up to four times without having to accept a loss in quality.

The essential components of such a welding device are a heating strip, which consists of an electrically conductive material, preferably a NiCr alloy, at least in one contact area. The contact area of this heating strip is oriented parallel to the transport direction of the hose material or packaging material and also parallel to the longitudinal axis of the filling hollow profile and is arranged such that it is enclosed by both edges to be welded together. The flat and flat contact area of the heating strip is therefore almost all over with its entire effective heating surface directly on the surfaces of the edges to be welded together. To compensate for the thermal expansion, tensile forces should act on the heating strip, which at least span their contact area and prevent bulging. A controllable electrical energy supply is available for heating the heating strip, which is connected to the heating strip at the front and rear ends of the heating strip, in relation to the direction of transport of the hose material or packaging material.

In these areas, connection areas are formed on the heating strip, which are pulled laterally outwards on one side, so that they can preferably be fastened to a pivoting or displacement device by means of these connection areas. to To avoid excessive heating of these connection areas, they are widened and designed with a correspondingly larger area, so that these connection areas heat up only slightly, whereas the contact area of the heating strip can reach a temperature which is sufficiently high for the welding of the edges.

The contact area can be coated with a friction-reducing and plastic-adhering coating, e.g. PTFE coated.

To regulate the temperature, which can vary in size depending on the respective hose material or packaging, there is a voltage and current measuring device on the controllable electrical power supply, with the measured values of which determine the respective temperature-dependent resistance and as a control variable for regulating the mean temperature the heating bar can be used.

The length of the heating bar can be matched to the electrical power required, taking into account the hose material used and the respective or the maximum feed rate at which it is transported during welding.

However, universally designed heating strips of constant length can also be used, but are contacted at different intervals, so that the effective heated length of such a heating strip can be selected accordingly by means of appropriate electrical circuitry.

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Apply preferably cold air to the preheated edges to be welded together.

Advantageously, the trigger system used for transporting the hose material or packaging means is formed from diametrically opposed belt drives arranged on the filling hollow profile, which are particularly preferably also operated with negative pressure support.

In contrast to conventional trigger systems, one of the two belt drives is arranged on the same side on which the welding device is also arranged. For this purpose, this belt drive is designed as a two - part double belt drive and the heating strip is arranged between the two belts of this double belt drive and aligned parallel to its longitudinal axis and parallel to the direction of transport.

To avoid speed differences, it is advantageous to move both double belts at the same speed by means of a common drive. The corresponding belt drive, which is arranged opposite each other, should also be driven in synchronous rotation at the same speed, for which conventional electronic controls can be used.

It is also desirable that the effective

The areas of the two belt drives are the same. Effective area is to be understood as the total area of each individual belt that is in direct contact with the hose material or packaging material. That means that the effective area of the

Row arrangement of several rolls or rollers can be used.

The second alternative is a contact pressure exertion, the pressure forces being used by means of a compressed air cushion between the pressing device and the edges to be welded to one another and the heating strip at a predeterminable distance.

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Φ lA * Φ et ii 3 P ¹ tQ ii tr 3 tr 3 co tr C P- Φ rt rt tQ 3 N 3

Φ Φ 3 Φ Φ P- 3 rt φ Di φ rt Ω Φ p- PJ- ii Φ 3 rt 3 tr 3 t, P- tQ * i 3 Φ tQ Φ Φ 3 3 PJ tr 3 ii Ω r <! 3 ö 3 S tr 3 D.

Φ i rt Φ Ω Φ tr rt 3 pr - pr tr - 0 i Di Φ φ p- ii Φ Φ ii tr Di 3 IQ Φ Φ to co P- Ξ rt Φ 3 Φ 3 g 3 li ii M Φ

3 = 3 Di et Φ Φ 3 3 • i Φ J 3 P- tr Di 3 3 Φ p- Ω 3 ii tr Φ ii P- et tQ J Φ Φ Φ tQ P- rt pr Φ 0 3 rt Φ Φ 3 ⁾ ii 1 3 ii left

t to H H in o in o in o in

3 P ⁾ 3 ü PJ X rt Di o Φ TJ tr Φ ü 3 rt ι-3 t Si ≥! Λ tr Φ ti tQ Φ tr N 3 left

P- 3 PJ Φ 3 Φ Φ Φ O ii 0 P- P- PJ Φ li • i P- Φ PJ Φ Φ li P- Φ P- Φ 3 P- 3 3 rt Nl tr li tQ P- rt co C 11 3 3 tr 3 P- J- Ω li Ω l P- N Ω CQ 3 3 3 Hl 3

3 rt Φ N • 3 PJ- et rt Φ rt ^| Q tr tr rt i φ tr Ω Φ D. <rt tQ

Di 0 g 0 to 3 ii li Φ ^ P- N rt Φ et Φ Φ 3 et tr 3 Φ Φ O tn

Φ li P- 0 Φ ö PJ Di 3 P- • i PJ 3 CQ ii 3 ii Di 2 £ 3 tQ 3 H 3 li CD 0 ii Di rt 3 Di P- PJ 3 et Ω Φ pr tr 3 Hi Φ Φ rt 3 0 to 3 co rt 0

3 rt rt 3 CD CD Di rjo Φ tr 3 rt PJ <0 tQ 0 3 ii 3 tQ CD rt Ω CQ CD

Φ Φ Φ PJ Φ rt Φ o rt 3 Φ tr Φ ii Di P- * £ CD τ3 Φ tr Φ rt

• i 3 3 pr rt Φ * CQ ö 3 • ^ 3 3 ii ii • i ≤ M Φ rt Φ Φ Φ PJ li * £ P- Φ ö

Hl • tr rt • PJ o i 3 Φ l-h co 3 P- Φ Hj 3 Φ ii P- 3 co CD Φ 3 ii • i

P- φ tr tr π 3 tQ P- rt Di Ω 3 Φ li ii P- Di 3 CQ rt p- Φ 3

3 ii φ P- et P- Ω o P- tr tQ & Φ pr 3 Φ s; 3 = & • i N Ω

Di Φ li 3 3 tQ pr tQ ^ φ K Φ Φ P- P- J PJ 3 α P- Φ rt φ ≤ pr

3 P- φ P ⁾ 3 Φ h- * Φ _^^ CD co φ 3 ii ii Ω Ω 3 3 3 ii P- N 3 O P- pr

3 Ω P- 3 Hl * tr 3 CO M rt φ P- 3 = tr tr 3 pr rt CL 3 rt Di tr CD • i Q tr Ω CD et 0 PJ Hi Φ P- φ co trä J Ω 3 Φ Φ • Φ PJ Φ Φ φ Ω PJ = co tr tQ CQ 3 rt tr 3 3 Φ 3 pr 3 3 3 li 3 li M ≤ 3 ti tr Hi Q Di φ ^ rt rt - Φ P- * ü 3 Hi Φ tQ 3 3 ι_ι. Φ Hi Φ rt

Φ φ & tr to J φ 3 PJ 3 ii Di P- Φ p] Di N ii P- Φ> it P * 3 Φ g ii Φ Φ et pr 3 D- - 3 3 3 Φ Di 3 co φ Φ 3 3 rt X PJ- PJ =

PJ = li 3 Φ et P- Hi rt Ω 3 P- • i Ω 3 • i CQ Ω et Φ 3 Ω PJ i / o PJ 3 tr s: Φ PJ tr Φ pr Φ P- tr J <! 0 PT Di 0 3 Di tr Φ 3 φ 3 X Φ Φ φ 3 Φ * i to Ω PJ Φ Hi Φ Φ * i - • Φ φ ii CD

3 CQ Φ 3 P- ii ii tr tQ li rt 3 PJ O tr ii 3 = li Di tQ 3 li 3 =

N P- CQ Φ Φ Φ Φ Φ Hi 3 tr et rt PJ ii CD PJ Φ PJ Di φ tr f 3 N to rt P- Φ P- 0 P- P- rt Di Φ 3 φ rt Ω CQ tQ P- 3 PJ PJ P- & rr

0- tr Φ Ω 3 * i Ω P * CD Φ • i 3 rt 3 fX tr CQ Φ g CD 3 3 Di

CQ P- φ ii tr tr • -3 Di 3; rt ^ co Hi tQ * i PJ * £ 3 Di CD o Φ li 3

3 P- P- Φ Φ pr Φ 3 CQ P- 3 co Φ Di 3 = PJ tQ co 3 = 3

3 D. CQ P- <! Di PJ 3 Φ - • ≤ rt tQ PJ = J 3 ≤ P- Φ tr 3 CQ tr Φ Ω D. tQ Φ rt Ω 0 Φ 3 TJ rt Φ φ Φ Ω 3 Di P- <ii Φ 3 Φ tr ü pr

3 Φ tr * i li 3 φ Φ P- ii 3 ii tr co ii Φ φ * i Φ α P- P- φ Φ g

? D * t i li 3 Di P- Φ tQ ü D.> i 3 ω ii * i CD * i P- P-

0- Φ P- N 3 X J S. Φ P- Ω Φ * i CQ TJ Di Φ 3 TJ Di 3 rt

3 3 CD 3 tQ Φ J rt PJ to 3 3 tr Di tr 3 Di Ω Φ J Φ 3 Ω P- Φ tr ii

3 rt li rt P- 3 3 * i Φ • rt Φ P- Ω P- tr 3 3 pr Φ rt Φ P-

Φ <N Hl ii 3 N Φ Φ CQ pr φ rt Si P- ¹ P- Ω Φ

3 Φ ≥i P- Φ 3 O P- rt φ t α Φ 3 CD ≤ D. tr ii

> i NI PJ 3 Φ Di 3 3 tQ 3 3. N φ 3 S P- PJ: N 3 left Hl P- Φ et

0 tr 3 tr P- P- Hl li 3 rt Hi C ⁾ 3 £ tQ rt Φ • i 3 3 Φ tr P- g rt 3 = CQ Φ N rt N Ω ≤ 3 Φ rt Di Φ Di P- Φ co P - 3 P-

3 3 P- tr tr rt CQ 3 tr J P- H 3 φ CQ tr &^>CD> 3 tQ 3

Φ Di 3 Φ Φ φ O H- ^ ii ii 3 y 3 = ii Ω 3 Di CD Φ p-

3 Di ii li tr O CD Di 3 Si 3 3 Ω Di 3 tr 3 li rt Si rt 3 ü s; 3 Φ CD tQ Φ Ω rt H PJ Φ Hi * i pr Φ Φ tQ 3 = Φ 3 = PJ Φ 3 ii

Φ tQ CQ rt Φ li tr Φ ii co CQ rt Ω φ ii <3 CQ Ω g tr tr p- & 3

P- to rt φ P- ii Hl Φ 3 PJ 3 rt PJ tr P- Φ Di pr Φ P- 3 Ω rt 3 φ p- P- 3 3 P- 3 3 3 to ii Di • i Φ P> ii 3 JN pr

Φ PJ P- P- * Ω PJ: ≤ CD 3 i Φ CO P- PJ = tQ Φ 3 P- 3 tQ 3 3 tr 3 3 tr Ω in p- P- 3 3> i 3 Ω 3 Φ i et 3 tr o P- 0- pr Φ tQ Φ 3 i

res, both overlap and fold seams are made. However, there is also the possibility of forming fin seams, but in this case the pressing device has to be made more complicated, since the required compressive forces have to be applied to a seam to be formed from two opposite sides.

Since the edges to be welded are heated immediately where they are required, the heat losses are very small, so that the heating rate is correspondingly high and a high degree of efficiency can be achieved.

With the solution according to the invention, hose materials or packaging materials, such as laminates made of paper / wax / PE, which are otherwise difficult to process, can also be easily processed.

In the event of changes, i.e. when changing the different

Materials and formats, the changeover times and corresponding adaptation measures required for this are almost negligible and do not pose a problem, since appropriate compensation by means of appropriate temperature control and adaptation of the acting pressure forces alone is sufficient.

If a pressure device is used with which the required pressure forces can be applied via an air cushion, a very uniform distribution of the pressure forces over the entire corresponding area is possible. An adaptation to different material or packaging thicknesses is easily possible and a change in the distance on such a pressing device is in ιυ to to in o in σ in O in

≥i Di tr ι-3 rt α <pr 2! N CD P- ^* ii Φ Di tQ P- 3 ^ ü SS <5 tr pr pr σ Di

PJ φ 0 ii P- P- 0 PJ P- 3 Φ P- P- P- Φ 3 PJ 0 3 0 0 Φ li 3 J ii S Φ

Ω 3 tr PJ pr Φ 3 3 Di P- Ω Ω 3 3 Φ Hl rt ii • ii 3 3 tr li PJ = 3 Di 3 T li tr φ 3 PJ 3 Φ li rt tr tr Φ • H- 0 Φ 3 Ω H 0 PJ 3 = Hi IQ 3 Ω PJ

Hi TJ CQ Φ Di ii P- P- pr et CQ Ω P- ii tr 3 = 3 CΛ Hi Ω rt ii pr CD to

0 M ii TJ - li Φ φ Ω iQ Φ 3 <tr tQ P- φ Ω PJ Ω rt pr Φ tQ Ω CQ CQ Φ

P- 0 0 lh * i P- J tr p- 3 CQ 0 Φ PJ p- Di pr rt tr Φ CQ Φ tr 3 tQ Q 3 Hι li CD P- 3 tQ et PJ rt tQ 0 li N 3 P- Φ Φ P- 3 P- N tr g 3 Φ φ CQ P- rt 0 3 Ω Φ Φ Φ 3 rt 3 ii Φ Φ P- ii PJ Ω 3 li 0 = tQ

3 PJ ii 3 Di * i ii 3 Hi tr Φ Ω Φ Φ CQ 3 P- 3 <tr PJ Di tQ

Di rt Φ p- Di 3 0 = tQ Φ 3 tr P- tr tr Φ * i PJ Ω 0 rt <; Ω PJ P ¹ 0 3

IS3 CQ Ω Φ 3 Di 3 Di CQ rt Φ Φ 3 N ö P- P- tr 3 P- Φ tr CQ P- tr P-

CD 0 tr i tQ Φ Φ P- 3 P- rt CQ 3 tr ii N • s 0 3 Ω 3 IX) »i et CQ Ω 3 Ω

0 ti PJ rt 3 CD P- Φ Di φ Φ TJ PJ pr P- TJ CQ tr tr PJ «rt Nl tr φ tr rt 3 3 tQ Di Ω 3 tr ii s Hi 0 = φ TJ Φ rt Φ rt 3 φ Z rt

P * Φ CQ 3 J Φ Φ tr Φ D- g et Φ rt 3 li TJ Φ P- 3 CQ φ 3 ≤ P- Φ P- P- s- tQ tQ 3 g CD g 3 P- P- - • Ω N 3 rt J rt 3 rt * i CQ Φ Ω • i Φ ω Φ Φ

Di PJ Φ Ω P) - PJ: φ rt tr 3 P- h- ¹ Φ Ω ii P- tQ Φ P- rt li tr

Φ i φ tQ CQ P- ii pr P- tQ tr J CQ α rt P- ii

P- 3 tr Φ tr t Ö • nt / t ⁾ pr 3 Φ σ. rt Hi φ tQ P- 3 Φ 3 = P- PJ O p- p- 3 CD rt Ω 3 Φ Φ <! et P- rt Φ Φ 3 ti Φ 0

Φ rt tr IX) 3 tr 3 Φ i CD tr CTJ P- 3 Φ - 0 3 3 3 ii ii

M TJ Si P ¹ 0 <3 Φ PJ ^ Φ Φ TJ rt Φ> • i tr Hi pr Ω Φ D * li J Φ PJ i 0 tr tQ • * i 3 φ PJ CD 3 J rt 3 3 tr PJ NH 3 0- pr CQ Φ

Hi CQ rt 3 P- ti 0 3 Hl Di ü 3 rt 3 Φ J CQ H- 3 ζ - 3 = Di 3 pr ii

P- CQ tQ N li tr rt 2 P- Φ Hi tQ Φ PJ F 3 3 tr 3 CQ P- 3 ii 3 =

3 rt 0 P- Φ P- PJ- H 0 Φ g 3 0 = 3 J rt P- Di Di P- CQ Φ Φ PJ: tr P- i Φ Di 3 Ω TJ rt Ω ü 0 co Ω (0 3 tr • i h- ¹ Φ Φ J 3 Φ 3 Hl Φ Ω H

3 p. Ii Φ rt tr ii ≥; tr N i * i tr 3 tQ co P- i ii ii PJ CQ 3 tr rt ii tr in

3 Φ D. li PJ et o PJ Φ Φ 3 Φ P- "* 3 Φ Ω Φ 3 rt Ω tr • Φ Φ Q ti Φ P- * 3 Hl tr P- ü 3 3 tQ 3 tr tr 3 • O pr φ P- CQ Di

3 O - 3 P- et 3 <: P- ¹ Φ Di Φ ti Φ tQ tr 3 co> P- tr P- Di

PJ Φ ^ tr tQ P ¹ Λ Φ Φ Φ P- rt to PJ 3 3 P- co Φ P- 0 3 tr 3 Φ Φ PJ

3 3 Φ g Φ 3 • i co • i Ω Φ CQ - 3 rt H rt 3 t> Φ ii tr • 3 ii P- pr CD PJ CQ tr CQ N CQ Di rt pr Φ Hi rt Di Φ li 3 = t Φ

PJ 3 Hl rt PJ P- ¹ CO * τi Ω Φ P- 3 O Φ 0- CQ P- Φ Φ ii pr J tr φ P-

3 P- 3 Φ P- 0 3 = tr 3 3 tQ Di rt ü 3 P): ii 0- 3 * i tQ 3 i PJ = Φ 3 li rt t- * z Di P- PJ Φ P- 3 Ω - Φ Φ 3 Ω 3 Φ Φ

CQ Ω 3 left PJ = Ω P- ¹ φ α N φ tr tr g φ & tr 3 3 tr 3 P-

<! 0 tr rt 3 φ rt tr tr P- Ü 3 3 P- 3 3 N Φ Di tr tQ 3 Φ

0 φ CD P- P- φ 0 i / Ö 3 3 li to 3 ≥l 3 P ⁾ Φ ■ £ P- pr CQ 3 3

3 PJ TJ Ω Ω 3 3 tr Φ Ω P- P- 3 PJ Di tQ Φ CQ P- P- Ω H P- tQ rt

3 Di • i tr tr 3 p ** 3 pr ω φ CQ tQ tr P- CQ P- * i tr Φ 0 CO φ Φ et et PJ TJ pr CQ Ω

Sf g P- Φ et Φ CQ 3 PJ <Φ P- co Di TJ

3 <CD Ω tr li Φ ü 0 tr φ Φ 3 tr ^ Φ 3 Φ 3 3 Φ ii

CQ Φ tr ti ■ £ tr 0 0 3 P- * £ 3 ii ^• »Φ CΓJ CQ ii CQ ii CD Φ N CQ Φ

Hl ti ^{• T} Φ 3 φ PJ = • i lh Hi Di φ PJ rt li Ω rt • ε 0 f li 3 Ω

3 = co 3 = 3 ii 3 D. P- to rt P- P- 3 P- φ tr Φ CQ Φ Φ 0 = Φ li tr ¹ tr tr Ω Di Si tQ 3 PJ: φ φ (7-3 rt ≤ 3 P- P- 3 0 P- 3 Φ CD 3 φ tr Φ <Φ P- 3 CQ 3 Φ li Φ Ω PJ CQ 3 Di P- 3 ts; Hi 3

P- l li Φ 3 tQ 3 Di φ 2 H- P- • i <tr 3 Ω Φ 3 3 3 φ P- rt i φ H tQ PJ Φ P- 0 = 3 φ φ Ω P- tr 3 3 tQ P - ii φ li 3 IQ tr ii tr 3 φ tQ Φ tr CD Φ 3 3

tion examples are explained in more detail.

Show:

Figure 1 shows the formation of a heating bar in two

Views that can be used on a device according to the invention;

FIG. 2 shows part of an example of a device according to the invention with a double belt drive, a heating strip and a pressing device;

FIG. 3 shows a plan view of an example of a device according to the invention and

Figure 4 is a view of a pressure device with compressed air effect.

Figure 1 shows an example of the formation of a heating strip 2, as it can be used on a device according to the invention. The heating bar 2 consists of a NiCr heating conductor alloy. This is followed by a flat, flat contact area 2 'at the two respective outer ends, laterally drawn out connection areas 2' ', which represent a larger area than the contact area 2' and are therefore essential when an electrical voltage is applied via the connections 11 - Loan are heated less than is the case in the contact area 2 ', which forms the heating zone.

In Figure 1 is also a dashed lines 12 a bracket 12 for the heater 2, which from a electrically insulating material is shown.

In the example shown here, the contact area 2 'has a width which corresponds to the width of the weld seam to be achieved.

In addition, there are 2 connection points 10 on the heating strip, at which the electrical voltage to be measured can be tapped in order to implement the required temperature control, as already explained in the general part of the description.

FIG. 2 shows an arrangement consisting of a double belt drive 4 with two belts 4 'which are spaced apart and parallel and parallel, a two-part pressing device consisting of a warm air system 7' and a cold air system 7 '', and a heating strip 2 with an integral part Connection areas 2 '' shown and recognizable.

The arrow shown indicates the transport direction for the hose material or the packaging. Both the contact area 2 'of the heating strip 2, the two-part pressing device 7' and 7 '' and the two drive belts 4 'are aligned parallel to the transport direction.

In the example shown here, the contact area 2 'is arranged directly behind the warm air system 7', the pressing device 7, the flat surfaces of these two elements also being parallel and, if possible, at a constant distance from one another. The cold air system 7 ″ then adjoins the warm air system 7 ′, it being possible to arrange it behind the contact area 2 ′ of the heating strip 2 in relation to the transport direction. However, there is also the possibility, as not shown here, of reducing the length of the warm air system 7 'and of lengthening the effective length of the cold air system 7''accordingly, so that a corresponding cooling by the cold air supplied already occurs at the end of the contact area. ches 2 ', the heating bar 2 is accessible.

Instead of the warm air system 7 ', a purely mechanical system, in which the compressive forces are applied directly, can also be used in combination with a cold air system 7' '(as shown in FIG. 2).

FIG. 3 shows a preferred arrangement of the welding device 1 and the trigger system, which is formed from the belt drives 3 and 4, in one

Arrangement shown on a filling hollow profile 5. Through the inside of this hollow filling profile 5, e.g. The filling of tubular bags takes place, as is also the case with conventional tubular bag form, fill and seal machines.

In this example, a predominantly circular filling hollow profile was used, which is designed as a flat surface only in the areas in which the belt drives 3 and 4 and for heating the heating strip are arranged.

The double belt drive 4 is designed as in the example according to FIG. 2, the two single belts 4 'having the same width and length and from the the same material, so that the same frictional forces can be achieved for the transport of the hose material or the packaging. This requirement should also essentially apply to the belt drive 3, which is arranged diametrically opposite one another.

Furthermore, an arrangement for a heating strip 2, which is connected to an indicated swivel drive 6, is shown in the position required for welding the edges. With such an arrangement, both overlap and fold seams can be produced.

The double arrows indicate that the belt drives 3 and 4, as well as the pressing device 7, can be moved towards or away from the surface of the hollow filling profile 5 as required.

The pressing device 7 shown here can be a strip-shaped design, which can be pressed flat against the one surface of the one edge to be welded together in the direction of the surface of the hollow filling profile 5, which serves as an abutment, in order to heat it - Accelerate entry via the heating strip 2 and secondly apply the contact pressure required for the welding.

The pressing device 7 can also be designed as a compressed air system, which can be formed in one or two parts (as already described). In this case, a carrier is used, on which there is at least one central compressed air connection, via which the compressed air is directed through regularly arranged air outlet bores towards one surface of one of the two edges to be welded together and the required compressive forces by means of between the surface of the edge to be welded to one another and the surface of the support built-up pressure pad are generated.

In addition to the regular arrangement of the air outlet bores, the nozzle-shaped openings should also have the same free cross-sections in order to achieve a uniform force effect on the corresponding surface.

A carrier of a pressing device, as shown in FIG. 4, can, however, also be separated in its interior into two parts for the formation of a warm air and a cold air system and have correspondingly separate compressed air feeds. The warm air system can be fed with preheated compressed air.

Claims

claims 1. Device for producing hoses from a thermoplastic, a thermoplastic containing material or a composite material with a thermoplastic coating, which are welded together along a longitudinal seam, and the planar hose material by means of an extraction system, around a hollow filling profile by means of a molded shaft or molded ring and is transported to a welding device arranged on the filling hollow profile, characterized in that the welding device (1) consists of a heating strip (2) which is flat and level in the contact area (2 ') and is to be welded to one another and is arranged in the contact region (2') with edges to be welded to one another an electrically conductive material, which is arranged between the edges of the hose material to be welded to one another, and a controllable electrical energy supply which is connected to the front and back in the transport direction teren ends of the heating bar (2) is connected. 2. Device according to claim 1, characterized in that the front and rear ends of the heating strip (2) have widened connection areas (2 ''), which according to a Side, are pulled outwards. 3. Device according to claim 1 or 2, characterized in that a voltage and on the controllable electrical power supply Current measuring device for temperature control of the heating bar (2) by means of an electronically controlled transformer are available. 4. Device according to one of claims 1 to 3, characterized in that the material edges to be welded together are pressed against the heating strip (2) by means of a pressing device (7) which exerts pressure force on at least one side. 5. Device according to one of claims 1 to 4, characterized in that the trigger system from diametrically opposite, on the filling hollow profile (5) arranged belt drives (3, 4), with which the hose material can be transported along the filling hollow profile surface and one of the belt drives (4) is designed as a two-part double belt drive and the heating strip (2) is arranged between the two belts (4 '). 6. The device according to claim 5, characterized in that the two double belts (4 ') are driven by a common drive at the same speed. 7. Device according to one of claims 1 to 6, characterized in that the effective surfaces of the belt drives (3 and 4) are the same. 8. Device according to one of claims 1 to 7, characterized in that the surface of the filling hollow profile (5) at least in the area of the belt drives (3, 4) as a flat surface. forms is. 9. Device according to one of claims 1 to 8, characterized in that at least the surface of the filling hollow profile (5) coming into contact with the belts of the belt drives (3, 4) is provided with a thermally insulating and / or friction-reducing coating. 10. Device according to one of claims 1 to 9, characterized in that the pressing device is a pressure-loaded bar, a row arrangement of several rollers or a circulating belt, which / at least against the parallel to the flat surface of the filling hollow profile (5) aligned heating strip (2) with the mutually arranged edges to be welded together acts. 11. The device according to claim 10, characterized in that the pressing device also exerts pressure force effect on the edges to be welded together in the transport direction beyond the heating strip (2). 12. Device according to one of claims 1 to 11, characterized in that the pressing device (7) is the carrier of an air nozzle system which is connected to a compressed air system or fan and at a predeterminable distance from the heating strip (2) is arranged. 13. The apparatus according to claim 12, characterized in that the air nozzle system is arranged as a rear, in the transport direction The warm air system (7 ') and a cold air system (7'') arranged at the front in the direction of transport are designed in two parts. 14. The apparatus according to claim 12 or 13, characterized in that the air outlet bores are arranged regularly and are oriented at an angle between 45 ° and 90 ° with respect to the transport direction. 15. The device according to one of claims 1 to 14, characterized in that the pressing device consists of a mechanically acting part and a cold air system (1 ''). 16. Device according to one of claims 1 to 15, characterized in that the heating strip (2) at least in the contact area (2 ') consists of a NiCr alloy. 17. Device according to one of claims 1 to 16, characterized in that the thickness of the heating strip (2) in the contact area (2 '') with the edges to be welded is constant and does not exceed 0.8 mm. 18. Device according to one of claims 1 to 17, characterized in that the width of the heating strip (2) in the contact area (2 '), with the edges to be welded together, corresponds at least to the width of the weld seam. 19. Device according to one of claims 1 to 18, characterized in that the width of the heating strip (2) in the contact area (2 ') with the

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