DE1779906A1 - A method for producing a strip material from crystalline, synthetic, thermoplastic resin - Google Patents

Description

P 17 79 906. 3-61 New documents

E, L · DU * CHT DE MSMOURS AND COMPAK / iOth and Market; Streefea, Wilraington _e Delaware 198 & 8, VoSt.A,

Process for the production of a strip material from crystalline, snythefcischera, thermoplastic Hare

Oblichee tape material to hold together large containers is usually made of steel (band iron). Another type of tape material »which is widely used finds, when the very high strength of steel is not required, is one of a series of parallel Kunsteeidenschnflr · «formed ·· tape, which ·· through« in binder xui is held together. The lowest type of tape material is described in U.S. Patent No. 3,028,281.

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Steel band is very strong »but has the disadvantage that it often has sharp edges, which, when handled, means a risk that it will not burn, creating difficulties in removal after use, and that when it is wrapped around a container, it is not stretches to shrink or yield as the container shrinks, as it does with wooden boxes, and around the To keep containers in their "original, firmly bound condition." Ribbon made of artificial silk cords arranged in parallel has too low a tensile strength for use with large Boxes and a very low strength in the transverse direction, so that the cords are pulled apart in use, if they are not attached equally.

The purpose of the invention is the production of tape material from so strong that it can be used as a replacement for band iron «and which is also after the Can be easily removed by burning, has no sharp edges, after wrapping a pack is able to see and to ring · ao the pack can poke around so that the tension is maintained stays when the pack shrinks. Another purpose of the invention is it. Tape material available, which has such high strength in the transverse direction that if it does not, it will not pull apart easily

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is attached equally.

QpgMietend the invention is a method "for the preparation Finre strip material * of a polyamide, polyester or Polyaectalhars with gleichmlseigem cross section by extrusion of Harses in a quench _s withdrawing the solidified B & ndes and stretching thereof by orphans" in which one the quenched strip to a Temperature in the range of room temperature up to 15 ° C below the Kristallechsielpunkt, ewlachen at least one pair of rollers by at least 4 times and thereby to a bandwidth of 0.7 to 1.5 times the width of the belt before the orphan.

The bandwidth is preferably 0.7 to 1.5 times the width of the material to be pressed from which the strip is rolled out. ISa has found that for this purpose the unevenness of the extruded goods before orienting ι

by evacuation, kissing is very important for making one rolled molded article of high strength 1st. This evenness looks at both the

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Cross-sectional dimensions of the extruded © !! Good as well to the orientation given to the pressed material. When the material to be pressed is guided around bends or bends before it hardens or cools sufficiently, is to go through and through to be solidified or at least one on both surfaces Having thick skin, the still liquid material inside the pressed body is displaced, resulting in the so-called washboard -

P effect or different relative elongations leads. Such an irregular pressed material cannot be oriented into a valuable strip of high strength by rolling it out, because some sections give their maximum orientation exceed and become frayed or hairy before the middle sections find their most favorable orientation have received. Polymer tapes and strips oriented by rollers are already known, these known tapes but did not have sufficient firmness in place of them

. to be used by bandels, as they could not be given sufficient orientation. Ribbons and strips of this known type are described in US Pat. No. 2 24 * 206. The tape material according to the invention is preferably 0.254 to 1.27 1 »thick and 6.25 to 19 mm wide, but can be used for certain purposes, e.g. B. for spiral wrapping of pipes with a large Durohmesser, also in larger widths, but & r.ah in smaller widths of only 3.175 "nra. The rolling stock is therefore preferably 1 mn

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thick and at least 6.35 mm wide.

In the drawings shows:

Flg. 1 is a rare echemical view of the entire device for the production of the tape material,

Pig. 2 an individual side view of an extrusion head I. and Absehreekbades,

Pig. 5 is a single end view of an orientation roller;

Pig. 4 the belt as it is on one of the orientation grooved rollers passes by

Pig. 5 shows a band of the extruded form from which the figure the porra opening is visible,

Pig. 6 «in diagram of the width of the X-ray Internet summit depending on the tensile strength for oriented, Polyhexaethylene adipic acid amide tape,

Pig. 7 a diagram of the voltage module as a function of the tensile strength for duroh orphans oriented · Poljh «xa» ethylenadipinelurea «idband,

Pig. 8 a diagram of the voltage modules as a function of the tensile strength for duroh roller-oriented polypropylene,

Pig. 9 is a logarithmic diagram of the dependence of the

e »

Tensile modulus of tension for strip material

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fabrics,

Pig. Fig. 10 is a view of one through the tape material Tube made according to the invention from "JUianrlerzuger Arrangement,

Pig. II a cross-section through the band according to the example and

12 shows a cross section through the tape according to Example 55,

According to the invention (FIG. 1), the polymer is in powder or flake form through the measuring and feeding device 1 fed to the hopper 2 of the extruder and through the extrusion head 3 is pressed into the quenching bath 4, The material to be pressed is pulled out of the quenching bath by the rollers 7 and 8 and via the arm 9 into the preheater where it runs back and forth over the rollers 11 ..

The temperature of the pressed material is in the range from room temperature to 15 ° C below the crystal melting point of the polymer to be oriented. The material to be pressed can be Room temperature can be oriented by rolling; However, the process runs smoother and with significant energy = savings if it is carried out at a higher temperature.

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Although preferably water for the quench bath because of its

easy availability and high specific heat used the material to be pressed is preferred to the orientation rollers supplied in an anhydrous state, because otherwise the between the Orientlerungawalzen by the rearrangement of the

PolymerisatmolekUle in the pressed material to develop heat Evaporation of the water or the other low boiling point Liquid and thus to the formation of cavities or other f Could result in defects in the tape material. The preheated Material to be pressed then runs between one or more pairs of Orientation rollers 12, 13 through and is of these

withdrawn under tension by the tension rollers 14, 14 *, by the heat treatment plant equipped with the vent 31 15, passed through the wasoh container 17 and sohliesslioh wound onto the spool 18.

Fig. 2 shows the pressed material 16 as it comes from the extrusion head exits and hinduroh under the guide roller 5, through the guide pins 17 under the roller 20 from the « Quenching bath is passed out. Vorzugswels «forms the pressing material emerging from the extrusion head 3 only one small angle with the path it travels through the quench bath. The preferred angles are in the range from 8 to 15 ° · Preferred catfish should also take into account the

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Problems occurring when the pressed material is withdrawn from the quenching bath due to the high rigidity of the pressed material the arc angle of the one passing under the roller 20 Material to be pressed before it emerges from the quenching bath must be small. Therefore, the material to be pressed must be essentially parallel run to the surface of the quenching bath and vprinasen the bath at an angle with the bath surface, which is also is preferably in the range of 8 to 15 °. Preferably the extrusion head is also as close as possible at the quench bath. If a polymer of low melt strength is used, such as the polyamide according to Example 1 * muse the distance between the opening 21 of the Die 19 (Ρ1β · 5) and the quenching bath less than 5 om be, and preferably it should be less than 2.5 om. The path dt · pressed material 16 preferably runs parallel to the surface of the fltfmlgkeit the suction corner bath and 12.7 up to 5 on under the surface. The guide pins are 17 required to prevent the material to be pressed from "snaking" or irregular irregularities, see below form. Because «pressed material should be both vertical and Be guided in a lateral direction by guide organs

Pig, 3 shows the design of the orientation rollers. In Pig. I. two pairs of orientation rollers are shown; but you can work with any number of rollers. As

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formed by Jewülls having a roller plansche 22 » which are attached to the central part 23. Dleae grooved roller can also consist of one piece. The flanges 22 have the task of helping to control the width of the oriented band by determining the size of the opening 24 limit. These rollers are made from one piece with

Driven them existing waves. The kind and catfish, f

in which the flanges 22 assist in steering the width of the belt, is shown in FIG. The pressed material \ 6 enters the mouth between the roller 13 (and the roller 12, not shown for reasons of clarity) and widens to the limits of the flanges as shown at 29, preferably so far that it is at a small distance walks past the splashes or touches them lightly. The oriented belt 30 then continues to either another pair of orientation rolls or to the tensioner. t rollers 14. The tension exerted on the belt 22 by dl · Spannwalstη l4, 14 * is the extent ·, su dem eloh die

Widely of the band diminished, it neared the orientations

walten 12, 13 has left. The nose of the band through the tension applied to rollers 14, 14 * varies with the polymer to be oriented in each case. In general, it is sufficient dl · tension only straight out »the pressed material leaves the mouth of the

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Orientation rollers equally without significant slip is fed. With polyolefins, such as polypropylene or linear polyethylene, it is often advantageous * that the Orientation rollers leaving the band somewhat ai; s2 · irecken. This stretching of polyolefins is preferably carried out twice as much. The strip material of the invention differs from foils in that it is more than 0.234 mn thick 1st. The amount of stretching 04er necking of the belt when leaving the orientation rollers must be precisely controlled, as the width of the finished belt » preferably does not deviate from the intended width by more than + 0.127 mm, because otherwise there would be no tape easily with the technically available Sohliess. fixtures can be attached. This · locking devices or Kalter are la alIge «a dioke HetallifcrechlUese or - bracket, dl · us! dl · fit the connection point of the band and old a machinist of those who put it together is used by Bandeisen (see U.S. Patent 3 026 261, but preferably old straight sides or edges) be strangled. Stirrups or spoles require one Width tolerance. The corners of the extruded fora measure somewhat oversized, as shown in FIG

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Using a mold of this shape counteracts the tendency of the Preesgutee to round off, and one can receive a pressed product with a rectangular cross-section. If an extrusion orifice of rectangular shape is used, the material to be pressed has an almost oval cross-section, and the orphans create an orientation that is too strong in the transverse direction, thereby reducing the amount of longitudinal deformation that can be imparted to the belt and the ultimate Strength as well as the value of the tape also decreased will.

The polymers suitable for the purposes of the invention are crystalline. Polyethylene Terephthalate 1st In Extruded States amorphous, but can be dissolved in a crystalline form Conversion, 41 · binder of, provides sufficient strength. L'iroh rolling out or heating above the Qlaa temperature from 8o ° C, amorphous polyethylene terephthalate goes into the (

crystalline «form about. Amorphous polymers, such as methyl polymethacrylate, cannot be orientated sufficiently to lift the required level for the tape Adopt tensile strength.

Crystalline polymers are those »dl · in the investigation with X-rays crystallographic reflections show / Melt quenched polyethylene terephthalate Is amorphous below 80 ° C and crystallizes at this point.

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Temperature "Suitable crystalline" polymers are polyamides, polyolefins, polyesters and polyacetal resins. Of these, polycaproleotsin, polyhexaethylene-adipic acid amide, rolyhexenmethylene-sebacic acid amide, polypropylene, polyethylene terephthalate and polyoxymethylene are preferred. Polyamides ", the 0 _# 2 to 5 wt _o j £ plasticizers are particularly preferred. Polyhexanethylene acid amide, polycaprolactam and polyhexamethylene sebaoic acid amide are perfectly suitable for the production of such plasticized polyamide tapes. In order to modify the polyamides For the purposes of the invention are those suitable plasticizer "the bit polyamides are compatible, echnelsen below 130 ⁰ C and above 200 ° C boiling * These Suitable plasticizers include 2-Kthylhejcandiol ~ l, 3, TetrajBethylensulfon, o- and pW-ethyltuluoleulphonamide, p-toluenesulphonamide, di-n-butylate and n-butyl tartrate. Binders made from polyamides of equal standing can regularly be produced with tensile strengths of over 4900 kg / cm ² . By adding the plasticizer to the polyamides, • Ine better convertibility of the pressed material to the strip material is achieved. This greatly reduces the number of breaks that occur when the tape is oriented. The term "polyoxymethylene" used earlier

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Also includes copolymers containing UIe $ 95 or more oxymethylene units.

f; i>"lßpl<?ii" represents Table I serve to the invention,

In each of these examples, the tape was In the above described device with orientation rollers from {

7.62 cm diameter produced. In all examples, the extrusion head was located less than an inch from the quench bath. The quenching bath consisted of water at 50 ° C. in all cases. Oils values for tensile strength and modulus of tension were obtained with a conventional testing machine, with slotted fastening rollers with a loading speed of 25> 4 mm / min, and a roller spacing of 12.7 em works ·. Dl · results refer to the initial dimensions of the tape. In Table I, RV means the relatively · Viecositit that was intended for polyamides Genias ASTM Prüfnor-Bi D-789, MI means the Soheel "index according to ASTM Prtlfnore D-L238 at a temperature of 190 ⁰ C and a load on the melt index tester of 2160 g was determined, FN means the flow number, determined according to ASTM test standard D-1258 at a temperature of 230 ° C and a

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Load of the melt index tester of 2l60 g, The polyoxymethylene was a commercially available resin with an index of molecular weight of 80,000 The relative viscosity of the polyethylene terephthalate was at 25 ° C of an 8.7% strength by weight solution Determined in "Formal". "Formal" is a solvent which consists of 7 parts 2,4,6 trichlorophenol and 10 parts of phenol. In the case of the poly Sthylen was only up to the stress-relaxation cycle a tension of 1406 kg / cm and not up to a tension of 2460 kg / cm, as stated in the heading for the other substances are indicated.

Examples 19x26 and 29 relate to non-preferred tape material. In Examples 36 to 38 the polymer contains 1 Oew.jf, in Example 39 2 Oew.ji / in Examples 40 and 41 5% by weight, in Examples 42 and 43 0.1% by weight and in Examples 44 to 46 0.5 0ew, £ o- and p'M-ethyltuluoleulphonanide as plasticizers. In Examples 47 to 49, 1% by weight 2% ethylhexanedol-1,3 is used as white hair. In Examples 30 and 51, 1% by weight of tetramethylene sulfone and in Examples 14, 52 and 53 1% by weight of C & prolaetam are used as soft water. In Example 54, the ribbon has a dumbbell-shaped cross-section with thick obstacles and a thinner central portion as in Pig. 11 shown. The tape dee example 54 is

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π, 6ί! 38 ran wide, the thick Xanten And at A 0.685 mm diok and at B 1.3875 ** wide, while the middle part at C 0.4826 is now double. The tape according to Example 55 has a "C ⁿ -five cross-section, as shown in FIG. 12. The" C of the tape according to Example 55 has such a curvature that the lowest point of the convex side at 0.889 is below that between the two Cattle drawn straight line lies. For Examples 54 and. 55, the material to be pressed has a rectangular cross-section, and the final shape of the belt is achieved by means of orientation rollers that correspond to the shape of the finished belt. In Example 56, "Celoon" from Celanese Corporation of America is used as the acetal copolymer. The polycaprolaotam used in Example 60 is not crosslinked and is made by adding 500 parts of y -Caprolaotaa alt *. Parts of NaH are mixed into one, -rom, which is then mixed at 150 ° C with a "wide stream of 100 parts of caprolacta" and 1.2 parts of phenyl isooyanate. The polymerization takes place within one minute with an “adlabatic temperature rise to 800 ° C. The polymer is then fed to a vacuum extruder” in order to drive off the remaining monomers and to feed a melt at 240 ° C to the actual extruder.

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The following is the definition of the products Term used in the invention "uniplanar, axial orientation" explained.

"Axial ¹¹ ," planar "and" unplenar "mean different types of crystal orientation in high polymer materials." Axial "orientation means that a given crystal axis (often the polymer chain axis) lies parallel to the macroscopic axis (ie the machine direction of an extruded product) hitherto known materials which have only been stretched in one direction (e.g. fibers or pollen scattered in one direction) generally have a noteworthy degree of axial orientation, the axes of the polymer chains are ideally suited for stretching · "Planar · ¹¹ orientation means that a given« Krlstallaehse parall ·! eu lies on a macroscopic plane, foils stretched in white directions usually have an orad of planar orientation, in that the figure eight of the molecular chains lie approximately parallel, but are arranged randomly in this plane. Uniplanar orientation means that a given crystal axis is parallel to a macroscopic axis and a given crystal surface is parallel to a macroscopic surface.

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of the invention, the axis of the molecular chains is generally in the rolling direction, and some crystal plane is parallel to the rolled surface. The expressions Relate to "axial", "planar" and "unplanar" orientations not in the sense in which they are used here only to the perfect alignment of the kind mentioned above, but also to structures in which there is a preferred orientation, even if a certain angular f Scattering occurs around the preferred orientation direction. Polymers oriented by rolling generally show "unplanar, axial orientation"; in certain cases, z. B. in polypropylene, but can axial orientation be required.

X-ray diffraction offers a convenient method of observing the type of orientation in the products according to the invention. A sample is inserted into a device, such as a "single crystal orienter", which is capable of rotating the sample in the X-ray beam about two mutually perpendicular axes. De crystalline materials only diffract the X-rays when the X-ray beam, the detector and appropriate crystal planes of the specimen in accordance with the Bragg ^1's law are arranged, can be the crystal orientation in the sample bestinnen, by examining the IntensitätsMnderung of the diffracted X-ray beam when the sample turned

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will. This intensity passes through a maximum when the angular orientation of the sample reaches a value that of the the most common orientation in the crystals of the sample is equivalent to. The breadth of distribution of the crystal clearances can be determined by the breadth of a diagram of the X-ray Radiation intensity as a function of the angular orientation of the sample at an intensity value which is equal to half of the peak maximum. Further Explanations of the definition of the types of orientation and the methods for determining the distribution of the crystal orientation in synthetic polymers can be found in a Work by C. J. Heffelfinger and R. L. Burton in the Journal of Polymer Science, Volume 47, pages 289 bis 506 (1960).

In the case of an extruded, rolled molded body made of poly « Hexamethylene adipamide is one such uniplanar axial orientation before that the Polymeriaatketten this tend. In the Walzrlohtung tu lie, and the (OlO) crystal planes tend to be parallel to the rolled surface.

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The angular width at the height of the maximum corresponds to the inclined position of the polymer chains from the rolling direction away to the direction of thickness and is less than 2 ° in the preferred structures. The inclination of the polymer chains from the rolling direction away from the cross-direction: ^1. ^ Is characterized by an angle of less than 2 ° 5 °. The inclination of the (010) planes around the rolling direction in |

Deviation from the parallel position with the rolling surface is in the preferred structures by an angle of less marked as 55 °. These angles correspond to those used for uniplanar axial orientation for polyhexamethylene adiplic acid amide receives which has been rolled out to at least four times its length. The others Polymers which can be used according to the invention have corresponding Angle for the deviation of the polymer chain axes from the Rolling direction on, dl · are as large or smaller than dit Angle given above. In the case of other valuable polymers, however, the unplanarity may, under certain circumstances, be less sharp be defined. Dl · Directional deviation of the polymer chains from the rolling direction to the direction of thickness or to the transverse direction at half the height of the top maximum deceives for all Resins preferably less than 22. In the case of polypropylene, The deviation of polyethylene and polyoxymethylene is the Polymer chains from the direction of rolling to the direction of thickness or to the transverse direction at half the height of the peak maximum

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preferably less than 15 °.

It is known that controlled deformation of a .crystalline polymer an improvement in the physical Properties of the polymer in the direction of deformation can achieve. This has been most developed in fibers and filaments where very significant improvements have been made lh the tensile strength and in the module with an axial orientation by cold stretching the extruded fiber or of the extruded thread can be achieved. Attempts to make appropriate improvements in the physical properties of CsTl more massive plastic structures with triaxial symmetry, such as ribbons, strips, leaves, elbows, T-pieces and Achieving such a thing has not been successful up to now, although in many cases noteworthy improvements have been achieved became. That it was not possible to improve the physical properties to the same extent as with High grade fiber, likely based on the fact that it was not possible “with these more massive products alt triaxial symmetry the required perfection and type of structure do achieve. The above examples explain how to achieve the required structural perfection in the case of crystalline polymers and copolymers, through careful selection of the respective polymer and marring under strong but not tarnishing effects Deformation- *

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These unique plastic products are unique high ~ structural integrity, high tensile strength in connection with a high modulus and excellent recovery from high loads. T) Ie ^ rind the same properties, which also have fibers from listeners quality grade, which one have uniaxial orientation with circular symmetry. The new materials differ * in that they are relatively massive and multi-axial * orientation *

own.

This level of perfection in structure can be measured in a number of ways. One method known in crystallography is to measure the sharpness of the

X-ray diffraction spectra along the various axes of the

Subject. Samples of tape material made of polyhexaethylenef "ipinsXureamid were on the one hand on known catfish (after US Pat. No. 2,244,208) and on the other hand according to Invention made. The results of the investigations of these samples can be found in Flg. 6. Who sees, 1st the degree of perfection achieved in these fabrics is essential higher than with the known products, which is considerable Improvements in strength go hand in hand.

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Although the X-ray examinations reveal essentials Differences from the state of the art show that »these examination methods are not the most sensitive and precise those for determining the perfection of the new materials be available. The most sensitive method of measuring this structural difference is, as it turns out has, in it, the voltage module depending fc of the tensile strength in the main direction of orientation in to enter a diagram. Flg. 7 eats such a chart for the dependence of the modulus of tension on the tensile strength in polyhexamethylene adipamide and shows a significant change in the slope of the curve indicating the beginning of the new structure at which the tensile strength and the modulus increases as the structure becomes more perfect will.

A similar Dlagranm of the Spenntrooduls in dependence the tensile strength shows Flg. 8 for polypropylene. The examples of the prior art are more helpful Patent Application No. 42,103 "Method for Improving the mechanical characteristics of products made from crystallizable, high molecular weight α-olefin polymers ".

Excellent results of X-ray examinations and material « Tests were obtained on the orientation of other crystalline polymers under conditions under which eich

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develop the novel structures. Pig, 9 is a graph of the dependence of the voltage modulus on the Tensile strength on a double logarithmic scale for a number of crystalline polymers, all of which show a significant change if they are processed in such a way that the new structures according to the invention result. stand.

Belt material must have a high inflection point tension modulus in order to be of great value for use. Crystalline polymers have the peculiarity that when they are drawn or stretched, their tensile stress rises to a certain value at a relatively small stretch, which remains constant by a multiple of the original dimension during further deformation and then rises sharply again. If you want to obtain extremely valuable strip material, «an must exceed the deformation that corresponds to the point at which this plateau ends and the tensile stress begins to increase sharply with further deformation. If this point is not reached, the tape material will not return to its original length after stretching or tensioning, but will retain a permanent stretch and sit loosely around the container it is intended to bind. After stretching, the tape should preferably return to its original length within a tolerance of 2 % . As can be seen from the examples,

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only take strongly oriented ligaments after exposure to considerable tension, ζ. B. of 2460 kg / cm ² , their original dimensions up to 2 % again. In the examples illustrating the recovery of polyethylene, only a tensile force of 14o6 kg / cm was applied, as only some

few samples with a tensile strength above 2460 kg / cm are specified.

A high inflection point voltage modulus is an indication that that the tape has been oriented or formed so far, that when tensioning around a pack there are none suffers permanent or excessive elongation or deformation. The lowest modulus for the preferred belt material according to the invention is characteristic, is 1.75 «al as great as that of the "undeformed" or "oriented" Polymer from which the tape material is made. The minimum deformation to bear this preferred 1.75 times the unimproved modulus is for various Polymers given in Table II.

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Table II

Polymer

Polyhexamethylcnadipic acid amide according to example 1

Polyoxymethylene according to Example 15 Polypropylene according to Example 23 Polyethylene according to Example 19

Polyethylene terephthalate according to Example J2

Minimum deformation to achieve 1.75 times the unimproved span now gs m odula

4.0

4.0 8.0

4.7

2.5

Considering the cost of the rolling and manufacturing process According to the invention, the tape material must have a tensile strength of at least 28OO kg / cm in order to be able to withstand ,, ahl can compete. The tensile strength is preferred therefore at least 28ΟΟ kg / cn. Some polymers, such as polyethylene, provide strip material with tensile strengths of a little less than 2800 kg / om; such polyethylene tape However, because of the relatively low cost of many applications are valuable in which the external advice high tensile strength of steel bandels is not required. Except for its high tensile strength in the longitudinal direction

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the tape material according to the invention has a tensile strength In the transverse direction, which is roughly equal to that of the unoriented Resin, and it therefore has a high resistance against pulling apart through unevenly acting fasteners.

The strip material according to the invention is particularly suitable for the production of light but very strong pipes. Such a tube is shown in FIG. Here, the insert 32 is spirally wrapped with a flat band of tape 33 and this in turn is wrapped in a spiral shape in the opposite direction with a second layer of tape 3 *. The tube can be held together by gluing the two bands and the insert together. It is also possible to achieve the cohesion of the rubbing parts of the pipes in a mechanical way, as is also shown in FIG . If an unusually long piece of pipe is required, the inlay is made up of a "beaten" -Istticken each 3 bla 9 m long, which are held together by iron bellows of the usual type. The two bands are then wrapped directly over the iron belly, and A traditional type of hose tie is used to keep the whole thing intact.

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The pipe can also be produced without an insert by winding the tape onto a dome, binding the minder to one another with adhesive or otherwise, and then pulling the pipe off the mandrel. Regardless of whether it is used or not, the highest strength is achieved if the belt board is in such a relationship to the pipe diameter mesiser that the spirally wound Ä

Band forms an angle of 53 ° with the axis of the conveyor. the preferred angles with the pipe axis are in the range of

45 to 70 °.

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Claims (1)

E. I. du Pont de Nemours and Company AD-2758/2855-Div. Fatentanip ^ & che 1. A method for preparing a strip material from a polyamide, polyester or polyacetal resin by extrusion molding of the resin in a quenching bath, sieving off the solidified strip and stretching it by rolling »characterized in that the quenched strip is heated to a temperature in the range from room temperature to If ^{heated to 15 °} C. below the melting point of the crystal, wipe at least one pair of rollers by the least! ^{Stretches 1} J times and thereby widens to a bandwidth of 0.7 to 1.5 times the width of the tape in front of the orphan. 2. The method according to claim 1, characterized in that man the ab st arc! «Wipe the opening of the mold and the level of the quenching bath to less than 5 cm, in particular · Measured less than 2.5 cm. 3. The method according to claim 1 and 2, characterized in that that there is a band exiting through the extrusion head at an angle of 8 to 15 ° of the quenching bath and discharges it from this at the same angle. k. Method according to Claims 1 to 3, characterized in that the strip removed from the quenching bath is sufOhred the Orlentierungswalaer in an anhydrous state. - 30 - 109838/0720 New documents (Art? 11 a * a No. ι s * ts *. K ** »m *> * 4. 9. ma BATH 2758/2855-Div. * 5. The method according to claim 1 to 4, characterized in that that the evacuation with the help of tongue and groove orphans he follows. 6. The method according to claim 1 to 5, characterized in that that you have an outlet opening of the pressing plant from im essentially rectangular cross-section with arched long sides used « " ³¹ " 109838/0720 BAD ORfGINAL sz L e G r s e i f e