DE1817730A1 - Reinforcement tape for use as a textile reinforcement insert in rubber articles and process for its manufacture - Google Patents

Description

^Γ PATENT LAWYERS. 1 VI 7/3 V

BRAUNSCHWEIG MUNICH

Uniroyal, Inc., 1230 Avenue of the Americas, New York, N.Y., 10020, USA

Reinforcement tape for use as a textile reinforcement insert in rubber articles and process for its manufacture

(Removal from the patent application - file number P 18 17 233.3-16 of December 27, 1968)

The invention relates to a reinforcement tape for use as a textile reinforcement insert in rubber articles, in particular in textile-reinforced rubber hoses, of rectangular shapes Cross-section and consisting of a number of multi-threaded, textile yarns and a binder, in which the yarns each essentially untwisted or untwisted and parallel are arranged in mutual contact with one another in one plane and are held together by the binder.

It is the object of the present invention to further develop a reinforcing tape of this type in such a way that the tape despite Multiple threads of the yarns and despite the use of several yarns one that is essentially homogeneous over the entire strip cross-section Distribution of threads and binders and thus has a significantly improved cohesion and a constant Retains cross-section over its entire length.

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This object is achieved in that each Yarn is impregnated through and through with the binder to the extent that the binder content is based on the dry substance makes up at least ΙΟ percent by weight of the weight of the yarn. the Practice has shown that only a binder content of the specified size ensures that the yarns through and through the binder are uniformly impregnated so that the individual threads are enveloped by the binder and tightened by the binder mutual position are held, despite the use of several such yarns in the finished tape the threads of the Yarns are evenly distributed over the ribbon cross-section and firmly connected to one another. Because of the uniform distribution of the binder and threads of the yarn is at the same time a uniform and constant cross-section over the whole Guaranteed length of yarn. Because of the uniform bond of the threads within the tape there is still a guarantee that the threads or yarns will not detach from the tape and loosen or form loops. Through the uniform Formation of the tape will further improve its winding on a winding core and the hold of the tape on the roll.

The invention is also based on the object of a method for producing and applying to a roll of a Specify reinforcement tape of the type described. This is based on a method in which at least two more

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filamentary yarns are impregnated with a polymeric binder in a substantially untwisted or untwisted state and then brought into contact with each other in a plane parallel to each other, whereupon the binder is dried. This method is further developed according to the invention in that the yarns are impregnated through and through to the binder to such an extent that the binder content, based on the dry binder substance, makes up at least 10 % of the yarn weight, whereupon the yarns after their merging into one The tape is wound onto a winding core while the binder is still damp and the tape is only dried after winding is complete. A roll produced in this way is characterized by a very high * dimensional stability and has no tendency to push off individual layers in a telescopic manner. The reinforcement tape itself has a high tensile strength, with the individual layers on. the rolls are sufficiently firmly connected to one another by the binder that has only dried on the roll, without the subsequent detachment of the tape during unwinding being impaired.

The invention is explained below with reference to the examples shown in the drawings.

Fig. 1 shows a perspective schematic view of a part cut device for carrying out the method designed according to the invention.

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Fig. 2 shows a single multifilament yarn in essence not twisted or twisted condition, in which no more than half a turn per 2.5 cm is provided.

Fig. 3 shows a roll of reinforcement tape in which Adjacent layers of the tape are detachably connected to one another are, and with four individual yarns at the end of the ribbon that are partially detached from each other.

Fig. 4 shows a partial sectional view of a high pressure hose, which is produced by means of the belt designed according to the invention is.

Reference is now made to FIG. In Fig. 1 is a schematic view of the device is shown, which is used to carry out the method designed according to the invention. These The device initially has a plurality of containers, each of which receives a spool on which a multifilament yarn is wound, the essential property of which is to be seen in the fact that it is not twisted or twisted is. (The bobbin with the thread wound thereon is not shown) Guide eyes 12 and 14, a container 16 with a bath 18, which consists of a polymeric binder, Guide eyes 20 and 22, a slotted guide eye 24, a tensioning device 26 and a reciprocating yarn guide

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device 28 and a winding core 30 complete the device.

It has been found that it is essential that the multifilamentary yarns be essentially non-twisted or untwisted twisted can be denoted by "by the expression" im essential not twisted or not twisted "should be expressed that the twist or twist from the value O to a maximum of 1/2 turn per 2.5 cm of yarn length. This term is used for the following description as well as including the designation used in the claims. A yarn that is considered not within the meaning of the invention is to be referred to twisted or twisted, is shown in FIG. Yarns that are essentially neither twisted nor are twisted, strangely enough, the manufacturer calls them a twist. This expression is intended to mean that no additional Twisting or twisting of the yarns is carried out by the manufacturer himself after the production.

Reference is made to FIG. 1 again. It is recognizable, that four separate yarns 32a, 32b, 32c and 32d from bobbins that are received in the containers 10a, 10b, 10c and 1Od. These yarns are looped through four openings the guide eyes 12 and 14 passed through. It should be noted that the yarns are spaced and parallel to each other

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be guided. Thereafter, the yarns are fed into the bath 18 in the container 16. Every single thread runs underneath a guide rod 34 which is attached to the walls of the container 16 inside. Three spaced apart Separation plates 36 are arranged on the guide rod 34, which have the function of separating four yarns from each other to keep. This design ensures that no errors will occur if the yarns during their immersion through the Bath to be run. This also ensures that the yarns are carefully impregnated with a polymeric binder within the bath.

After the bath, the yarns are first led out and passed through openings in the guide eyes 20 and 22. in the Following this, the yarns are brought together, through the slotted guide eyelet 24. This is used for collecting of the yarn and brings them into a parallel position next to each other.

The four yarns are then passed through the tensioning device 26 which serves to equalize the tension of the yarn and regulate. At the same time, it has the task of arranging the yarns in the form of a ribbon or strip in which the individual yarns are arranged essentially coplanar.

The four yarns are parallel coplanar in that shown Arrangement summarized and in this state by the back

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and guided guide device 28 moved here and are wound onto the winding core 30 by this. It is of particular advantage if the reciprocating yarn guide device has a rectangular channel cross-section, whose inner clear width corresponds essentially to the sum of the width of the four yarns or slightly greater than the overall width is measured. By using a cross-section designed in this way for the yarn guide eye the yarns are arranged again so that they have their flat, parallel, coplanar arrangement in which the edges of the neighboring Yarns touch each other, maintain.

Maintaining mutual contact is of particular importance, as the yarns after impregnation with the polymeric binder and after being wound onto the winding core are still wet. This ensures that, after subsequent drying, a layer of impregnated tape will be lightly is tied or glued by the binder, so that a gluing occurs slit the underlying or overlying and adjacent layers of the tape. The drying of course also leads to an intensive connection of the edges of the individual yarns that form the ribbon occurs. This results in a wrap made of a reinforcement tape that has a firm, has a dense contour and maintains its shape. Compared to telescopic pushing off, such a lap is

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layers completely solid. Nor does it tend to form loops. The roll is also designed so that the respective outermost tape layer is easily pulled off the next lower can be.

Although the preceding description suggests the use of four Explaining yarns, it will be understood that other numbers of yarns are used can be. In general, however, it has been found to be advantageous if between two to twelve yarns be used; because no particular advantages can be achieved if more than twelve yarns are used, although this is not excluded according to the invention. Preferred however, three to six yarns are used.

Examination of the multi-filament yarns that can be used to form the reinforcement tape shows that it is it is essential that the threads of these yarns are continuous. The composition of the threads of the yarns can be as desired Dimensions can be varied, depending on the desired properties of the fabric-reinforced rubber article to be produced. For example, any known continuous thread, whether it is made of synthetic or natural material, be used. Examples of materials used to form the threads are polyamide or polyhexamethylene adipamide and called polykaproamid. It is also possible to use polyester, such as

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for example ethylene terephthalate polymers and their copolymers can be used. Acrylic polymers and copolymers, such as polyacrylonitrile can be used. The threads of the yarns can also be vinyl polymers, such as, for example, polyvinyl alcohol, polyvinyl chloride and polyvinylidene Chloride be * Fluorinated ethylene polymers, such as Polytetrafluoroethylene can also be used will. The use of polyhydrocarbons such as linear polyethylene, linear polypropylene and of copolymers of ethylene with other polymerizable Monomers is possible. It can also regenerated cellulose, cellulose acetate, polyurethane or the like. be used. Suitable for the production of the reinforcement tape designed according to the invention are also yarns made from natural products such as silk, glass or the like.

A particularly suitable material for the formation of continuous Threads is a two-material thread made of polyamide and Polyesters, e.g. hexamethylene diamine adipic acid polycondensate polyester (often referred to as mixed thread). Such two-substance Threads are commercially available. For example, they are available from Allied Chemical under the trade name EF-121 manufactured. In general, such threads are applied to the Way obtained that initially polyamide and polyester, i.e. Ilexamethylenediaiiiin-adipic acid polycondensate and poly-

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Ethylene terephthalate can be melted and mixed and afterwards the molten mixture thus obtained is extruded in the form of threads. Such mixed threads or fibers contain the generally 50 to 90 percent by weight polyester. Such double-material threads are more detailed in the edition of "Chemical Week" of April 16, 1966 at page 35. Further information can be found in the publication "Chemical and Engineering News" dated September 5, 1966 on page 57A.

In the case of such two-material threads composed of hexamethylenediamine-adipic acid polycondensate and polyester, both hexamethylenediamine-adipic acid polycondensate and polyester can form the continuous phase. It appears, however, that in the case of two-material threads in which polyester is at least 40% by weight of the thread, the polyester part forms the continuous phase, while with proportions of less than 40 % polyester, hexamethylenediamine-adipic acid polycondensate represents the continuous phase. It has been found that particularly advantageous results are achieved when a two-material thread of hexamethylenediamine-adipic acid polycondensate polyester is used, in which hexamethylenediarain-adipic acid polycondensate is contained in an amount of about 70 percent by weight and polyester in an amount of about 30 percent by weight.

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If the reinforcement band formed from several yarns, which is designed in the manner described, is intended for the production of high-pressure hoses or similar textile-reinforced rubber articles, it is obvious that the nature of the polymeric binder in the bath 18 should be chosen so that the tape is glued to the subsequently applied rubber materials is possible. So In fact, water-based or organic solvent-based baths, which are known in the art, are suitable for processing the ropes or threads in preparation for the subsequent gluing of the rubber material. Such baths can be used as a dipping medium for the yarns can be used to form the reinforcement tape. The person skilled in the art can very easily find a number of suitable baths here for a given thread material.

For ducts made of synthetic silk fibers, hexamethylenediamine-adipic acid polycondensate threads or two-material hexamethylenediamine-adipic acid polycondensate-polyester threads, in which hexamethylenediamine-adipic acid polycondensate is the continuous phase, it is particularly advantageous if a solvent ^{bath is used which is called "RFL M} solution bath" is known and is an aqueous resorcinol-formaldehyde rubber latex. Examples of such "RFL" solution baths are in US Patents 2 128 229,

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2 128 635, 2 429 397, 2 561 215 and 2 615 826. Further information can be found in the publication "Rubber World "from October 1954 on page 126 and from September 1957 on pages 847 to 851.

If glass threads are used to make yarn then this is It is advantageous to use solvents which are particularly suitable for enabling rubber to be glued to glass fibers. Examples are in the United States patent

3 029 589.

If polyester is used as the thread material for the yarns or if two-material polyamide-polyester threads are used where polyester represents the continuous phase, then it is advantageous in the so-called second immersion technique to work, which is described in Belgian patent 696 860.

A preferred way of enabling an excellent adhesive bond with subsequently applied rubber supply and the yarns, If the yarn is made of polyester threads or polyester-hexamethylenediamine-adipic acid polycondensate threads consist, in which polyester is the continuous phase, first of all, that first the threads in a submerged aqueous turbidity of a phenol-blocked isocyanate

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in which water-soluble epoxy resins are dissolved, after which drying takes place at temperatures around 180 for a period of 2 minutes and that secondly, immersion the dried yarn is made in an aqueous solution of a bath with resorcinol-formaldehyde resin, which is also contains a latex of a terpolymer butadiene, vinyl pyridine and styrene. This treatment is followed by winding of the yarn while still wet on a winding core to form the winding. This is followed by another drying about 180 ° C. In order to achieve good gluing results, it is advantageous if in the solid rubber material, which is after the Formation of the fabric reinforcement for hose formation is applied, a methylene acceptor is built in, for example in the form of methylated nitroalkanes or based on resorcinol can be constructed. This creates a very good connection with the threads of the yarn. That kind of approach is detailed in the corresponding Patentanrael- (| serial no. 617 808 of February 23, 1967.

It is apparent, however, that known chemical vulcanizing compounds can be added to the solid rubber supply in order to improve the connection in a known manner Reach rubbers with the multi-yarn reinforcement tape.

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After the yarns impregnated with polymeric binder are wound onto the winding core while the binder is still wet and the winding has been formed, it is subjected to drying. The drying conditions can be changed within wide limits. For example, higher temperatures can be used with shorter drying times. For example, a temperature of the order of magnitude of 400 ^° C. with a drying time of only a few minutes can be used, while drying can be carried out just as well at room temperatures, the drying time required then being several days.

An important aspect of the invention is the discovery that the amount of solids uptake of the yarns from the bath must be considerably greater than before. Heretofore, preparation of yarns for the production of fabric-reinforced rubber hoses using twisted or twisted multi-filament yarns has been prepared by treatment in a solvent bath. The immersion of these twisted or twisted yarns in the solvent bath leads to a solids absorption of about 4 to 7% of the yarn weight, calculated on the dry substance of the binder. The amount of solids uptake was largely determined in large part by the geometric shape of the yarns. This means that the twisting or twisting of the yarns led to relatively solid yarns with a circular cross-section which are impregnated

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resisted with the material of the solvent up to the inside of the yarn bundle. Instead, it was almost exclusively a surface coating caused by solids from the solvent bath. Therefore, the stated solids uptake was also found to be in the range of 4 to 7 % and this value had to be accepted. Likewise, the resulting bond strengths between the yarns treated in this way and the rubber material stocks applied during hose production also had to be accepted.

The fact that yarns are used, which can essentially be described as untwisted or untwisted, results in a solids absorption from the impregnation bath which is at least 10% of the yarn weight, calculated on the dry substance of the impregnated). This uptake of solids is much higher than before. The use of yarns that are essentially untwisted or untwisted, and the fact that these yarns are passed through an impregnation bath, results in a continuous impregnation with polymer! Binder which extends into the interior of the yarn so that essentially every single fiber or thread of the yarn is impregnated. This results in the relatively high solids uptake in the order of magnitude of at least 10% of the yarn weight, which can be achieved in a very simple manner. The impregnation of all yarn cross-sections

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with the polymeric binder leads to a considerably improved adhesive effect between the reinforcing tapes consisting of such Yarns are formed, and the rubber layers that are applied to such tapes.

The amount of the polymeric binder which should advantageously be used to impregnate the yarn, calculated on the dry substance of the binder, is about 10 to 25 percent by weight and, in the most favorable case, should be between 12 to 15 % of the yarn weight. In order to obtain these solids uptake values, it is advantageous to use a solvent bath in which the polymeric binder is proportionally contained in a high concentration, that is to say in at least 10 to 40 percent by weight. It is more advantageous if the polymeric binder is contained in the bath in the range between 12 and 25 percent by weight.

As stated earlier in this description, the flat multi-yarn yarns are used Bundles in that they are dried while still wet after soaking with polymeric binder, by the effect of the binder are united at their adjoining edges to form coherent bands. This drying process is used also to a weak connection or sticking process (on the basis of the polymeric binder) an already existing layer of the tape with adjacent plies or layers

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BATH ORIGINAL

to create a tape above, below or next to it. This leads to the formation of tight wraps that are capable of their Maintain shape and size.

Such a winding is shown in FIG. This wrap is tight or firm and completely resistant to it
a telescopic pushing off of individual parts, and yet

the free end of a tape 38 can be pulled off the coil very easily, as is the case for braiding or spinning around.
Spiral wrapping of a hose or the like. Is required if the fabric reinforcement is to be created.
It should be noted that the band 38 in the embodiment shown consists of four yarns 32a, 32b, 32c and 32d which
are partially drawn separately from one another in the figure. However, this representation is only used to clarify or separate the individual yarns to show that the tape
is a body made up of four individual yarns. Λ in the practice, the ends are, however, fixed to each other by the
Combined effect of the polymeric binder.

It should be noted that the multi-yarn tape formed according to the invention essentially as a body
can be viewed with a rectangular cross-section, the width of which is at least twice, but essentially a multiple of the thickness of the individual yarn. Typical tapes of the type designed according to the invention, which are used for braiding or braiding.

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Forming fabric reinforcements suitable for hoses can have widths in the range from 0.3 to 4 mm, whereby However, it must be taken into account that smaller or narrower and also significantly larger or wider bands can be used.

These multi-thread tapes are characterized by the fact that the individual threads that are used to form the tape tend to flatten. This is to be understood as meaning that yarns are also viewed as being essentially rectangular in cross section can be, the length of the rectangular cross-section (or width of the yarn) in accordance with the width of the Tape and the height of the rectangular cross-section corresponds to the thickness of the tape. That leads to another Increase in the flat character of the entire band. The possibility of flattened (rectangular cross-section) Using yarns arises from the fact that each individual yarn is considered essentially not twisted or Twisted can be viewed and compared to the twisted or twisted yarns that were previously used in the manufacture used by high-pressure hoses differs significantly. The twisted or twisted yarns have an im substantial circular cross-section.

Neither the number of threads from which the essentially non-twisted or non-twisted yarns consist

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are used to form the reinforcement tape, nor the The fineness of the individual thread of the yarn is critical. The following values are typical for yarns that are suitable: it can Yarns used from about 50 to 2000, preferably however, there are about 100 to 1000 and most advantageously about 150 to 400 threads. As a fineness for the yarn is recommended a value that is advantageously in the range between 1100 to 4400 den. lies, although higher or lower den. just as well can be applied.

The winding of the reinforcement tape in the one designed according to the invention Execution is particularly suitable for use in the production of fabric-reinforced rubber hoses or the like. The wrap is when it is made in the specified manner is very highly impregnated with polymeric binder, which is able to bond between the individual To enable yarns' of the tapes as well as between this tape and a solid rubber material.

The production of fabric-reinforced rubber hoses, such as the production of high pressure hoses is carried out according to the usual methods. These differ only in accordance with the invention by known methods that Reinforcement tape wraps can be used instead of the previous thread wraps. In connection with this, the USA

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Patent specifications 3,083,130, 3,296,047 and 3,336,172 are referred to, in which the details of conventional methods of manufacture texti! reinforced rubber hoses are described.

In general, this procedure is such that a rubber tube or hose is first drawn over a mandrel will. This rubber tube serves as the inner tube for the finished hose. Then the textile fabric reinforcement layer around this rubber tube, either by a braiding or spinning process or by the yarn wound around the rubber tube in a spiral or similar manner.

For the production of hoses designed according to the invention instead of the yarns that have hitherto been customary, tapes of the type described above are used, which are impregnated by polymeric binders are. The reinforcement tape is braided over the inner rubber tube in the desired manner, although also one spiral winding or a similar technique can be used. It must be taken into account that the use a flat band for braiding to form a reinforcing fabric layer of a hose has particular advantages brings with it; because in this way a better or closer packing of the tissue than before can be twisted or twisted yarns with circular cross-section

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reach. There is also a guarantee that the yarns of the reinforcement tape in the one designed according to the invention Execution have no tendency to unravel during the braiding process.

Particularly suitable for hose production using the mentioned type of reinforcement is the so-called lead jacket technology, in which the hose is surrounded by a lead sheath generated by extrusion. In connection the one enclosed in this way is involved in the formation of the lead ice Hose vulcanized, under steam pressure at about 60 minutes. Then the lead coat is stripped off, so that the fully vulcanized textile-reinforced high-pressure hose is obtained.

When only a single layer of reinforcement is required is to form the hose, then this is going over this layer a second rubber tube or a second rubber hose applied and the entire arrangement in the usual way vul ^ · caned.

When more than one layer of textile reinforcement is required is, then this is also possible. In such cases, after applying the second rubber layer, the is laid over the first fabric layer, a second fabric layer

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arranged from textile material and on this one more Rubber layer applied. This can also be followed by vulcanization in the manner already mentioned. One of those Two-layer fabric-reinforced hose is shown in the figure. The hose 40 shown there has an inner one Rubber tube 42, a first reinforcement layer 44, an overlying one Rubber tube 46, a second reinforcement layer 48 and an outer rubber tube 50. Each of the reinforcement layers 44 and 48 are formed by braiding using tape 38 (Fig. 3). The tape is carefully with beforehand polymerera binder has been impregnated. After the hose has been vulcanized, for example using the lead jacket technique, which has already been described above, each of the rubber layers 42, 46, 50 is associated with the respective adjacent one Layer of polymeric binder intimately connected, so that there is an intensive solid bond with the respective adjacent reinforcing layers results.

It is obvious that under certain circumstances hoses are required that have three or more reinforcing layers. In such cases, the technique already explained continued accordingly.

As already mentioned in the introduction, the described shape of the reinforcement tape allows the achievement of a very dense,

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tight packing of the fabric during the braiding process, with the tape its flat, rectangular cross-section in the tubular carcass maintains. The braided band leads to the formation of a substantially regular smooth profile, which clearly differs from the previously usual irregular profile, that when braiding with twisted or twisted ones Yarns (with a circular cross-section) are produced. Such irregular profiles can be recognized by the appearance of hills and valleys above the tubular carcass. From it As a result, for example, couplings on hoses often only have an interrupted contact with the hose surface obtained and that there are significant sources of error in this way, because the couplings then easily come out of the hoses pull out. In contrast, the uniform packing and wrapping achieved by using the invention trained reinforcement tape is achieved, able to comply with very close dimensional tolerances between To ensure hose and coupling, so that a greater surface contact between the coupling pieces and the braided fabric product is created. There is therefore also a considerably reduced tendency of the hose to Failure caused by the detachment of clutches or the like. develop.

It will be readily appreciated that the wrap of reinforcement tape that can be provided in accordance with the present invention is useful for manufacture

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a large number of different high-pressure hoses as well as for the production of other types of fabric-reinforced rubber articles can be used.

The type of rubber material used to form the Reinforced tubing or other articles are not critical. In fact, virtually everyone can common types of rubber such as natural rubber or synthetic rubber can be used. The following are examples called: polychloroprene, nitrile rubber, SBR, butyl rubber, Natural rubber, synthetic natural rubber, ethylene-propylene-copolymer-guinmi, EPDM rubber (ethylene propylene diene rubber, also referred to as EPT rubber), polyurethane rubber, chlorosulfonate polyethylene guwni, reclaimed rubber and the like. It should be mentioned that the was used as a rubber material or stock Rubber, if necessary, can also be mixed with other components such as polyvinyl chloride or the like can. Such a mixture can, for example, consist of polyvinyl chloride with nitrile rubber, which is sold under the trade name "OZO" by Naugatuck Chemical.

The following examples serve to further illustrate the invention. All quantities are unless expressly stated otherwise stated, to be understood as weight specifications.

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BATH ORIGINAL

Example 1:

In this example the device according to FIG. 1 is used. Commercially available RFL latex solution (40 % solids, from Versatile Products, Pine Brook, New Jersey) available under the trade designation "Capitol 232 RFL Solution" is dissolved in water up to 20 % solids and used as bath 18 .

Four yarn ends, each of which consists of 1260 * strong threads with a number of 240 and a twist of 0. A material is used as the thread, which is a combination of hexamethylenediamine adipic acid polycondensate with polyester. The material is ^{available from Allied Chemical under the designation 11} EF 121 ". These yarns 32a, 32b, 32c and 32d are passed through said bath at a speed of about 37.5 meters per minute. After immersion in the bath, the Yarns are collected and fed through the slotted guide eye 24 to the tensioning device 26 and arranged coplanar in a parallel position until the individual yarn edges touch one another as a result of the guide device 28. In this state and while the yarns are still wet, they are wound onto the winding core 30 .

The winding created in this way from the reinforcement tape is in hot air at about 90 to 100 ° C for the duration of

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dried for about 2 hours and then to room temperature cooled down. The tape then shows a solids pick-up of approximately 14 percent by weight. Four yarns are used to form the band their edges together to form the flat coplanar band, in which four yarns form one end of the ribbon. Again, every single thread is very careful, impregnated up to the middle of its cross-section compact, in turn each layer of the winding with the neighboring Layers is connected, but the topmost layer can very easily be pulled off from the layers below can. .

Example 2 _{:; Ä} .

Reinforcement tape wrap produced according to Example 1 are used to manufacture "SAE 100 R3" hydraulic hose used. Such a hose is a seamless, oil-resistant hose, the inner tube of which is made of polychloroprene rubber and which has a fabric layer of high strength and flat contour, which is made by braided organic Yarn is formed. An intermediate layer of polychloroprene is applied and then a second braid before another polychloroprene topcoat is applied. The polychloroprene ear is in the desired Size extruded over a flexible plastic core

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A standard New England butt braider with two work tables and 24 bobbins is used, each winding of yarn being used to apply the first and second braid layers. (24 tape wraps, which are produced according to Example 1, are now used) The first layer is braided over the polychloroprene tube. A polychloroprene layer of the appropriate size is applied over the first braid and then a second braid is made. A W polychloroprene sleeve is extruded over the second braid in the appropriate dimensions.

Each of the polychloroprene rubber layers has previously been provided with suitable vulcanizing agents, accelerators, fillers and softeners, which are usually required for the formation of the hose or vulcanization.

The hose that has not yet hardened is then coated with a lead jacket using a lead press and, after this coating, vulcanized in a hot steam bath for 45 minutes. Then the lead jacket is stripped off the hose.

The hose thus obtained was subjected to quality control by being checked in accordance with "SAE" specifications. It had turned out.

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that it fully meets these requirements. The adhesion between the rubber layers and the textile reinforcement layers surpassed everything before.

Claims

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Claims (4)

Claims 1. Reinforcement tape for use as a textile reinforcement insert in rubber articles, in particular in textile-reinforced rubber hoses, of rectangular cross-section and consisting of a number of multi-threaded, textile yarns and a binder, in which the yarns each essentially untwisted or untwisted and arranged parallel to one another in a plane in mutual contact and through the. Binders are held together, characterized that each yarn is thoroughly impregnated with the binder to the extent that the binder content, based on the dry substance of the binder, at least 10 percent by weight the weight of the yarn. 2,) Method of manufacture and application to a winding of a reinforcement band according to claim 1, in particular for rubber loops provided with a textile reinforcement insert, in which at least two multi-filament yarns in substantially untwisted or untwisted state impregnated with a polymeric binder and then parallel in a plane be brought into edge contact with each other, whereupon the binder is dried, characterized in that the yarns with the binder through and through to an extent are impregnated that the binder content, based on the 0Q9819 / 1633 dry binder, making up at least 10 % of the weight of the yarn, whereupon the yarns are wound onto a winding core in a known manner after they have been brought together to form a tape and the binder is still moist, and only the fully wound tape is dried. 3. The method according to claim 2, characterized in that the yarns by introducing a Binder of, based on the dry binder substance, 12 to 15% of the yarn weight are impregnated. 4. The method according to claim 2 or 3, characterized in that three to six multifilament Yarns are arranged side by side after impregnation and before winding. 009819/1131