DE1260124B - Method for producing an elongated foam body or sealing tape provided with a flexible cover - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B29d

German KL: 39 a3- 27/00

Number: 1260124

File number: St 13008 X / 39 a3

Filing date: October 2, 1957

Open date: February 1, 1968

The invention relates to a method for producing an elongate one provided with a flexible sheath Foam body or a sealing tape.

A method is known in which a core made of latex foam is placed on an envelope strip and this is folded around the latex foam. It is a process in which an already finished Body, the core made of latex foam, is placed on the cover strip.

A method for producing so-called rubber strips is also known. With this one In the process, a rubber compound is introduced into a wrapping strip, and this wrapping strip is attached grips apart from each other by brackets that hold its edges together and unobstructed Prevent the rubber compound from escaping. This enveloping strip is then placed in a device carried out through a vulcanization zone.

It is also already a process for continuously wrapping elongated objects has been proposed with foamable insulating materials, in which the foamable plastic compound a flat endless conveyor belt applied and in a round bending device at the same time Foaming is hardened around a centrally guided pipe. In this process, the foamable fills Plastic compound so that the conveyor belt only partially.

The invention is based on the object of creating a method with which an elongated Foam body or a sealing tape can be produced, the cross-section of which is the largest to achieve Elasticity or good spring properties is as largely filled with foam as possible. One such Sealing tape can be ζ. B. to seal windows or doors where it is used Prevents drafts from entering between the frame and the window or between the floor and the lower edge of the door.

Based on the above-mentioned method, in which the polyurethane-based substances to be foamed are applied to an envelope strip and the strip is folded around the reactants lying on it, the invention solves the problem set by the fact that the edges of the strip are continuously joined together to form a foam-tight seal and the casing is freely suspended at the interconnected edges of the strip as the foaming reaction approaches its completion. By joining the edges in a foam-tight manner, a method for making one with one
flexible sheath provided elongated
Foam body or sealing tape

Applicant:

Sterling Alderfer Company, Akron, Ohio

(V. St. A.)

Representative:

Dr.-Ing. E. Berkenfeld, patent attorneys,

5000 Cologne-Lindenthal, Universitätsstr. 31

Named as inventor:

Sterling William Alderfer,

Harry Davis Bodley, Akron, Ohio (V. St. A.) - -

of the strip, the reactants are prevented from escaping during foaming, and one obtains thus a clean sealing tape, which is not caused by foam body parts protruding from the edges is disfigured. Furthermore, you can fill the envelope with the maximum amount of the reaction participants, see above that one obtains a full sealing tape with a large active cross section. Since the cover is only on when its interconnected edges are suspended, the one existing inside the envelope becomes foam-forming reaction is not hindered.

Air pockets would reduce the sealing properties of the sealing tape. The invention sees therefore suggests that the cross-sectional area of the sealed air expulsion strip is momentary and is temporarily reduced.

At this stage of the process it is provided that the strip is under during the reduction step Forming a number of passages, channels or openings that are folded when joining the edges allow a controlled escape of the trapped air and yet the foam in the hold back the closed strip.

It has been found to be useful that the foam-tight finish on a tape made of vinyl polymer is trained. According to the invention, this foam-tight closure can be achieved by induction heating manufacture with high frequency.

In a further development of this idea of using high frequency, the invention provides that a protective strip of an adhesive on a

709 747/540

3 4

The outer edge of the folded strip is placed in a merem ratio or in mixtures: Tolylenedi- and the opposite inner edges of the isocyanate, methylene-bis-4-phenyl isocyanate, octad strips with the adhesive strip isocyanate, α-naphthyl isocyanate, 1,5-naphthalenedifene on them sealed by induction heating with high frequency isocyanate, dianisidene diisocyanate and triphenyl will. 5 methane triisocyanate.

With reference to the drawing, the invention. It has been shown that in the reaction of the poly

further explained below. The drawing shows esters or polyether resin with the isocyanate groups a device for carrying out the invention the use of an amine as a catalyst proper procedure. In the drawing it is desirable. As catalysts, for example

F i g. 1 schematically shows a side view of a previous io triethylamine, tri-n-propylamine, tri-n-butyl direction for exercising the amine according to the invention, tri-n-amylamine, dimethylaminoethanol and driving, diethylaminoethanol should be taken.

Fig. 2 is a section along the line 2-2 in Fig. 1 of the polyester or polyether, the catalyst and

with the representation of the inlet end of the device, the water from tank 1 and the polyisocyanate from

tang in the top view, 15 tank 2 are connected through suitable pipes 4

F i g. 3 is a view taken along line 3-3 brought together. The pipelines lead over

F i g. 1 with the representation of means that the envelope shut-off valve 5 to two measuring points 6 with constant

hold strips while the foam-forming reac- delivery rate, the pumps 6 lead the reaction

tion is approaching its completion, participants through shut-off valves 8 in a common

Fig. 4 is a view taken along the line 4-4 in FIG.

and F i g. 6, chen has 10.

_ F i g. 5 shows an enlarged section along which the common mixing and supply element 10 is seated

Line 5-5 in FIG. 3, on a suitable carrier 11 and contains a vertical

Fig. 6 is a view along the line 6-6 in the right standing frame 12 with a vertical, after F i g. 4, 25 downwardly directed bushing 14 which has a drive shaft

F i g. FIG. 7 shows an enlarged partial section along FIG. The drive shaft can be driven via a line 7-7 m FIG. 1, homely belt drive with belt pulley 16 from FIG. 8, a section similar to FIG The lower end of the bushing 14 is shown in FIG Top view of a measured amount of the reaction part of the other embodiment of a device to be pumped to the taker. A mixing screw 20 is attached to the lower end of the drive shaft 15 to guide the method according to the invention. Shows a side view of this exemplary shown as _35. 11, it rotates upward to orm of Dep, flow of the reactants such as for the generation-F i g. 12 to 16 cuts along lines 12-12, necessary for a good polyurethane foam 13-13, 14-14, 15-15 and 16-16 in Figure 11, is to mix intimately.

F i g. 17 a partial section along the line 17-17 The speed of the mixing screw 20 is preferred

in FIG. 10, showing a roller electrode 40, in the range from 600 to 2100 rpm, the best for applying the high frequency, mixing speed is set according to the

Fig. 18 is a view taken along line 18-18 in set of reactants set and set up Fig. 10 showing the other role elec- tron also according to the type of cell structure desired. trode, which causes the closure process, if one approaches the reactants or

Fig. 19 is a partial plan view along line 19-19 ₄₅ changes a different size in order to obtain a smaller reaction rate in Fig. 11, then can

Fig. 20 is an enlarged partial view of a higher mixing speed according to the invention, the sealing tape produced according to the invention with, however, if the reaction speed is increased, an adhesive protective strip, _ _ _so is to achieve a satisfactory visual

F i g. 21 and 22 cuts along lines 21-21 50 mes a lower mixing speed required, and 22-22 in FIG. 20, At the bottom of the mixing chamber 18 is a

F i g. 23 shows an enlarged partial illustration of an abutment plate 21 with an opening 22 attached through which their embodiment of a feed line 23 provided according to the invention from the mixing chamber Sealing tape. The line 23 has under the mixing Fig. 24 and 25 cuts along lines 24-24 55 auger20 a conical opening24. The administration and 25-25 in Figs. 23, 23 opens into a flexible tube 25 made of rubber Applying the protective strip to the enveloping strip, the mixture of as yet unfoamed reaction and take part! 26 is applied to a preferably continuously running FIG. 27, a view in the viewing direction of the line 60 of the band of the cladding material 30. That 27-27 in Fig. 26. open end of the tube 25 is supported by a support. Referring to the inFig. Ibis9 shown bracket or a support27 held that with a Embodiment of the invention includes the device screw bolt 28 attached to the plate 21. Tankl the polyester, polyether or similar compound. The support bracket 27 ensures that the reaction bonds, the catalyst and water- The tank 2 65 mixture 26 on the lowest section of the belt contains a suitable isocyanate or polyisocyanate. 30 is brought,

Applicable for the purposes of the invention iso- ders for the jacket or the tubular casing

Cyanates, for example, are either alone, the material used in iso is, for example, a work

fabric that is flexible or easily stretchable in the form of strips or bands and that can be heat-sealed or stitching together. It must and may be impenetrable for the reaction mixture neither by the reactants themselves nor by the heat that, because of the exothermic nature the foaming process occurs, are attacked. In the case of the FIGS. 1 to 9 illustrated embodiment According to the invention, the envelope material 30 is, for example, a polyethylene film which is heat-sealed is put together. The polyethylene film can be printed with a decorative pattern on request will. In another possible embodiment of the invention, the sheath 30 can be made from consist of a cloth material that has been cut to size or treated so that it has the above Has properties and can be joined together by stapling or sewing. At the in the F i g. In the embodiment of the invention shown in FIGS. 10-27, the shell is preferably a vinyl polymer film. Other suitable materials that have the above properties are the Known to those skilled in the art.

The casing material 30 is supplied and folded by a device which has the reference number 32. According to the F i g. 1 and 2, the roller 33, which supplies the covering material, is adjustable in two cones 34 and 35 mounted, which in turn are rotatably arranged on the axis 36. At the inside end of the axle there is one Cuff 37 with an adjusting screw through which the axis is in the correct position to a perpendicular to the Base plate 11 attached bearing block 38 is brought. The inner cone 34 has a pulley-like interior Flange 39, on which with frictional engagement a flat belt 40 rests. One end of the belt 40 is attached to the bearing block 38 at 41. At the other end of the belt 40, a counterweight 44 is fastened with a buckle 42. The weight 44 pulls the belt 40 down into the flange 39 of the cone 34. This is caused by friction a brake cable while the cladding material 30 is pulled through the device. The outer end of the Axis 36 is mounted in the vertical web of an angle iron 45 attached to base plate 11.

The cladding material is pulled from the underside of the feed roller 33 and then runs over a Drag roller 46 which runs freely on an axle 47 mounted in bearing block 45. The role 46 is with a nut with washer 48 held on the axle 47. After passing through the roller 46 runs the strip of the cladding material passes under a folding plate 50. The folding plate is triangular or wedge-shaped and is preferably directed downwards from a support arm 51 at an angle of 45 °. The support arm 51 is attached to the vertical web of the bracket 45.

The plate 50 forces the strip 30 to be triangular in shape with an increasingly narrowing one End to accept. In this way, a fold 30 a and the outer edges 30 & become close brought together.

After the strip 30 has passed under the plate 50, it is inserted between a pair of upright rods 52 and 53. The rods 52 and 53 stand on a flange 54 attached to the bracket 45. The rod 53 is held immovably on the flange 54 by bolts 55. The rod 52 is adjustably attached to the flange 54 with a bolt 56 so that it can be moved relative to the vertical rod 55. At the upper end of the rod 52 a support 57 is attached, in which a drag roller 58 is rotatably mounted. When the cladding material passes through the rods 52 and 53, the edges 30 & are brought very close to one another. Once the cladding material is passed over the roller 58, the edges b brought into actual contact 30, and the folding of the strip is finished. While a preferred embodiment of the folding device 32 has been shown and described, it will be understood that other folding devices may equally well be used for purposes of the invention.

After the reaction mixture 26 has been applied to the strip 30, the edges 30 are έ together sealed. A pocket or a closed casing is created in which the chemical reaction occurs the constituents can run off with the formation of foam. The device for sealing carries the reference numeral 60 and is shown as a conventional sealing device for polyethylene.

According to FIGS. 1 and 3, the sealing device 60 is driven by a motor 62 via a conventional drive with a pulley and drive belt. The motor sits on a base plate 63 which forms a unit with the housing 64 of the sealing device. The housing 64 is adjustably attached to a column 65 which is fastened to the frame 11 with a pin 66. This results in an adjustment in the vertical direction, whereby the width of the sealed edges 30 b, and thus the volume of the envelope can be changed for any given strength of Hüllwerkstoffes.

The real connection of the edges 30Z) of the In each embodiment of the invention, cladding materials are preferably made up of a pair of endless, resistance heated belts or bands 68 made of corrosion-resistant steel. The straps are driven by a toothed drum 69 and rotate around toothed drums 70. For tensioning the A pair of small toothed drums 71 are provided for each belt 68. This allows the strength of the pressure with which the edges 30 & pressed against one another during the sealing process will adjust. The input side of the housing 64 is equipped with curved input guides 72, so that the strip 30 passes evenly through the sealing device 60. On the operating side of the sealing device 64 are suitable in the housing Switch 73 is provided with which the stainless steel belts 68 supplied Heat can be regulated.

As shown, the heat sealing device 60 is in addition to heat sealing the edges of the polyethylene strip 30 still used to generate the train to the strip from the feed roll 32 and through the Pulling the FaIt and Charging links. It is obvious that for the purposes of the invention, too another sealing device as described and shown here has been used with equal success can be. For example, the train could be generated by its own drive device, the would be arranged separately from the sealing device. In addition, z. B. the edges by a sewing machine or another suitable device

7 8

are sealed when a cut to size and foam formation is nearing its end. This co-treated Fabric material, possibly with tel, have the reference number 90. a decorative pattern, shown as the shell material 30 as shown in FIGS. 3 and 5, there is a turn would be. satisfactory suspension means, for example, from a

The strip of the cladding material 30 becomes a tensioning chain 92, which for example at 93 has tooth knowledge Contains a lot of air. When this air circulates and is driven by it, Each link of the chain has a plate with pins 94 at the end of the foaming reaction ganges still remain in the closed envelope of small diameter. A suitable brush 95 would, the result would be an unsatisfactory cell structure is attached vertically above the frame 11 and of the foam. To avoid this inconvenience, io serves to open the sealed edges of the envelope 30 the respondents are sized to push the pins 94. The chain 92 is as long as a quick response not immediately after its delivery required to wear the closed envelope 30 going on. In addition, funds are available while the reaction to foam formation in the seen that the air from the inside of the seal-essential approaches its end. On it will drive out the casing. 15 the finished article stripped from the chain.

According to FIGS. 4 and 6, the air in FIG. 9 is produced according to the invention

sealed envelope by a device with the foam article denoted by the reference numeral 100

Reference 80 driven out. As shown, net. The reaction substances have become

the device 80 consists of a pair of vertical stressed envelopes 30 in all directions.

ben 81 together, which are moderately expanded to ao with bolts 82 on one side and form a foam core 102

the frame 11 attached plate 83 attached with a uniform cell structure and relatively

are. The small cross-sectional area shown on the left-hand side of FIG. Article 100 can be used as a

a strut 81 can be used with the aid of a washer 84 sealing material, the different

and a cap screw 85 opposite the other bound edges 30 b a strip for fastening

Adjust strut. The struts are arranged to represent 25 of the sealing material at the point of use,

that they close the sealed envelope 30 together. If it is desirable, the edges 30 b

Press until their cross-sectional area or their Vo- are also removed and the foam core remains

lumen equal to or smaller than that of reaction in a round outer jacket. Finally can

mixture 26 is the amount introduced; so, as in the foam core 102 will also be used alone,

F i g. 6, an airtight "dam" from Real-30 in which the casing 30 is completely removed or

tion mixture 26 a formed. The adjustability of the stripped. The core 102, when in a

Strut 81 allows the operator the transverse shell is made with a smooth inner surface,

to regulate the cut surface of the shell at the "dam", especially when polyurethane foam is in a poly-

that regardless of the volume of the envelope or the ethylene envelope, a shiny, shiny one is formed

Degree to which the foaming at this point 35 surface with a pleasant exterior, the

has already progressed, the "dam" reflects enough highlights.

is strong, so as not to let air into the case, Other types of foams that are in the after the sheath has passed at this point and foaming either expand with time and without the foam hardening before this or by heat, you can use PolyStelle instead being pushed back excessively. It has been applied 40 urethane foam. For example shown that the formation of the "dam" can be facilitated vinyl resins with a foaming work, when the underside of the sealed envelope in the fabric or a gas, e.g. B. carbon dioxide is used Passing through the struts 81 by a follow-up.

adjustable support 88 is carried. Shortly after the after in the F i g. 10 to 19, the device for expelling the air 45 according to the invention, if a strip of vinyl has passed through it, it becomes in accordance with the progression of polymer film W at a constant rate of reaction generally as shown in FIG. 8 by a suitable device form, not shown here. processing, obtained from a supply or supply source, Another method of driving out excess, e.g. In addition to the mechanical "dam" plate 121, which can be applied at an angle below the assembly, wire arm 122 is attached. The folding plate 121 from a number of small openings in the forms the strip in a folded section around envelope, which allows the controlled escape of superfluous with side parts W ¹ and W ' ² . The folded strip allow air and gases. This method then runs through a guide 123, which the side parts are in the application of a seal pattern. Here erects.

the superimposed edges of the stripe- Next, the stripe runs under a purpose-

fens connected in such a way that between the press-down rollers held closely together from above

openings 124 through the sealed surfaces contacting the inner surface of the strip,

that connect the inside of the envelope with the outside air.

tie. These openings allow the controlled tion of wire widening the side panels again

Air and gases escape, but are small enough to be pushed apart into a V shape. The mixture

A nozzle 126 prevents any leakage of the foam in larger parts from the reaction foam

Avoid scope. Such a seal pattern is applied in the bottom of the V-shaped strip,

the F i g. 20-25 shown. 65 immediately after it emerges from the guide 125.

After expelling the air from the interior, the nozzle 126 opens into the bottom of a mixing

the closed envelope, this is held up by means of a vessel 127 in which the necessary reaction components

taken and guided, while the reaction leads to the recipient in the process of generating a satisfactory

the foam required ratio through appropriately and wear the shell until the foam-forming reaction

nete mixing devices thoroughly and intimately as good as finished.

be mixed. The nozzle is dimensioned so that it has the one shape of the two

Mixture M in measured amounts according to drive produced finished sealing strip is in

the speed of the moving strip 5 shows FIG. 20-22 shown. The F i g. 23 to 25 show

gives off, so that after the end of the reaction of another form. In the case of the FIGS. 20 to 22

Foam the shell of the finished product completely shown is made up of the seal pattern after the shape shown

fills out. the side parts W ¹ and W ² to form the flap F.

After the reaction mixture M are sealed together by the nozzle, from a number of in

126 has been applied to the strip, through- io longitudinally spaced apart, transversely-

the side parts W ¹ and W ^{2 run} a guide 128 of the sealed strips or rectangles 140 between

and as a result, thin channels 141, which are close to one another, become a little bit in the

brings. The upper edges of the overlapping flap F protrude into it. At the far end of this

Pages then pass between two rollers and ribs lie sealed rectangles 142 that define the

are sealed together by induction. The 15 channels 141 essentially close off. But how

Large roll 130 on one side of the strip can be seen from Fig. 20, the channels 141 are

the negative electrode electrically connected to a high frequency sufficiently larger than the rectangles 142,

low voltage frequency circuit connected. the leakage of trapped in the shell

On the other side of the strip, a belt is used to remove excess gas in an adequate amount

or belt 131 made of steel under tension around two rollers ao possible while the reaction ends.

132 and 132 ', which goes in the opposite direction of the strip. The foam may vary depending on the on

are arranged at a certain distance from each other. the amount of reaction substance applied to the strip

The belt between these rollers 132 and 132 'presses mixture to flow into the channels 141, as in FIG

the superposed upper parts of the strip F i g. 20 and 22 is shown. The foam core stretches

on the circumference of the roller 130. The roller 132 'is the 25 the lower folded part of the envelope so that this

positive electrode in the high frequency circuit, and a substantially circular cross-section

the current flowing through the belt assumes the big reel.

130, with the parts of the strip lying on top of one another. The seal pattern shown in FIG

fens the dielectric between the electrodes is the sealing ribs on the circumference of the roller 130

set so that they are formed without the electrode rollers or 30. As FIG. 18 shows, the ribs 140 '

To heat the belt 131, induction heat the sealed rectangular strips 140 while

to be sealed. The surface on which a seal is made, the ribs 142 'standing on gaps, the rectangles

occurs is increased significantly when the belt 131 form 142.

for pressing together the superimposed The shape of the shown in FIGS. 23 to 25

Edges of the strip is used. As a result, the sealing strip has a seal pattern, according to which the

the effective sealing time is increased. It has become side parts W ^ and W ² with the formation of the flap F '

shows that a high frequency circuit with one frequency can be connected to each other, and shows two in

in the order of magnitude of 49 kHz at 16 V befri- transversely arranged rows of

delivers results. rectangular sealed surfaces 144 and 145. If

After the sealed casing has been applied, the sealing rollers have enough reaction mixture to flow

leaves, it runs between two vertical rollers 133 of the foam in the inner row of surfaces 144 and

and 134 through. These are arranged so that the forms an elongated foam rib 143 ', which in the

tubular lower part of the shell together runs essentially parallel to the foam core 143,

is pressed so that the cross-sectional area of the envelope. But the areas 145 are close enough to one another,

less than the amount of reaction applied to slow the flow sufficiently so that a lateral

substance is. This creates an airtight dam to flow over the surfaces 145 before the

from reaction substance, around the sealed envelope, later reaction of the foam is over, is avoided,

complete against air. As shown, while the exit from the envelope

Rolling essentially in line with the connected excess gas is possible. That

coming folded envelope. The envelope is shown at 50 in FIG. 23 seal samples shown resulted from

at an angle between the rollers, replacing roller 130 with a similar roller

is squeezed by them. which on its circumference a pattern according to the

According to FIG. 19 can be the angle between the in F i g. 23 had shown.

Adjust the rollers and the casing by the fact that the two in FIGS. 20 and 23 shown

upper ends of the rollers firmly in a cross member 55 forms the foam a piece in the flap

135 are mounted, the rotatable and slidable flow in to reinforce the tab or to be made stiff by a screw bolt 137 with a bracket.

136 is connected. The screw bolt 137 sits in the finished sealing strips as a cushion an elongated hole in the cross member 135. or as a draft lock for doors and windows

When leaving the roller 133, the closed 60 is used, for example the tab on the sene shell, while .the door or window frame forming the foam core are attached. Of the Reaction in the lower folded part of the envelope its fastening process is greatly facilitated when the the actual end is approaching, carried on. This flap on one side with a strip or a is conveniently done by providing the adhesive through the tape to attach the tab Sealing of the superimposed edges 65 of the door or to be attached to the window frame. That However, the tab on a tension chain or a tension belt tape must be protected until is applied, which are placed at a distance from one another, the tab is applied to the supporting surface has arranged pins that will pierce the tab.

The sealing strip shown in FIGS. 20-22 is provided with a strip or tape of ordinary vinyl polymer film which is crimped on one side of the flap F. Of course, such a tape can be applied both to the one shown in FIGS. 23 to 25 shown shape of the sealing strip as well as any other shape can be applied. This tape consists of a base 146 of vinyl polymer film with an applied layer of adhesive 147 and a protective blanket or cover 148 over the adhesive. This cover can be a film made of polyethylene or paper or consist of material that can be easily peeled off the adhesive layer when the tab is on the supporting surface, for. B. is applied to a window frame.

The vinyl polymer film can be sealed onto the flap by induction at the same time that the edge parts W ¹ and W ^{2 are sealed.} As Fig. 10 shows the covered tape T running from a supply roll 150 by a guide 151, which may be as shown in Fig. 16, fastened to the guide 128, and thus to the portion W ^z just before reaching the Sealing roller 130 brought into contact so that the three vinyl polymer layers W ¹ , W ² and 146 are sealed and connected to one another simultaneously and uniformly by high-frequency current. During this process, neither the adhesive tape nor the protective layer made of paper, polyethylene or any other covering material are affected by the current, while the three vinyl polymer layers are heat-sealed by induction.

It may be desirable to apply the tape directly to the tab of the sealing strip, thereby eliminating the need for the tape's vinyl polymer film base 146 shown in Figures 20-22. In this case, the vinyl polymer W can be removed from the supply roll 120 via a RoEe 153 supplying the adhesive in the manner shown in FIGS. 26 and 27. The roller 153 rotates in a direction opposite to the movement of the strip W with the lower part of the roller dipping into a supply of adhesive in the container 154 . A wiper blade 155 removes excess adhesive from the roll. And as the fig. 27, the roll is placed on one side of the strip and is of the thickness required to apply a narrow tape to the strip.

The adhesive can be any well known, non-drying adhesive that is compatible with the vinyl resin and remains substantially tacky at all times, such as a vinyl acetal compound. After leaving the roller 153 , the strip can be guided over rollers 156, 157 and 158 through a heating zone in order to convert the adhesive strip into its permanent adhesive state by drying. Roller 158 can cooperate with roller 159 to pull the strip through the process of applying the adhesive. A tape of cover material 160, e.g. B. paper or polyethylene can be pulled over the tape by threading the strip 160 through rollers 158 and 159 .

The strip W with the applied, covered adhesive tape is then passed over the folding plate 121 and the operation then continues as shown in FIGS. 10 and 11, with the exception that the vinyl polymer tape T is not applied. The adhesive 161 and its cover 160 are not attacked by the high-frequency current which seals the parts W ¹ and W ² one on top of the other together.

The unfoamed reactants can also be introduced into the jacket before, during or after it has been converted into the tubular shape.

Claims (6)

Patent claims: 1. A method of making an elongated one provided with a flexible sheath Foam body or a sealing tape, the substances to be foamed being based on polyurethane applied to a wrapping strip and the strip is folded around the reactants lying on it, thereby characterized in that the edges of the strip are continuous to form a foam-tight Closure are connected to each other and the sheath connected to the interconnected Edges of the strip is freely suspended while the foaming reaction is completing it going towards 2. The method according to claim 1, characterized in that the cross-sectional area of the closed strip to expel euft momentarily and temporarily reduced in size will. 3. The method according to claim 2, characterized in that that the strip forms a number of passages, channels or openings during the shrinking step is folded, which, when the edges are joined, allows the trapped air to escape in a controlled manner enable and yet retain the foam in the closed strip. 4. The method according to claim 1, 2 or 3, characterized in that the foam density Termination is formed on a tape made of vinyl polymer. 5. The method according to claim 1 to 4, characterized in that the foam-tight closure is made by high frequency induction heating. 6. The method according to claim 5, characterized in that a protective strip of a Glue is placed on one outer edge of the folded strip and the opposite Inner edges of the strip with the adhesive strip lying on them by induction heating be sealed with high frequency. Considered publications: German Patent Specifications No. 949 307, 1175423; German utility model No. 1728932; U.S. Patent No. 2141405. For this purpose 2 sheets of drawings 709 747/540 1.68 © Bundesdruckerei Berlin