DE2353513A1 - MATERIAL FOR COMPOSITE FILM AND METHOD FOR MANUFACTURING IT - Google Patents

Description

THE GOODYEAR TIHB & RUBBEB COMPANY, Akron / Ohio - USA

Composite Foil Material and Process for their production

The invention relates to the production of Tubing with a body made of cord-reinforced elastomer and to the manufacture of a composite elastomeric sheet or tape material that is used in manufacture such hoses can be used.

A significant proportion of the hose manufactured today contains for many sizes and. especially for high Squeeze a helically wound cord reinforcement. This so-called helically reinforced hose is mostly unchangeable with a balanced winding made, that is, with an equal number of similar ters, running in opposite directions are placed and either several helically use gord threads wound on the partially built tube or a composite construction which the cords are already attached to a carrier that becomes a whole of the hose to be produced. In the latter case, the cords and the straps practically manufactured as a continuous web that thus potentially also for other purposes, e.g. to create

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- Reinforced drive belt can be used. Relatively narrow strips are cut for use in the production of hoses then wound in a helical shape when building the hose will.

Previous proposals in this area have not been entirely satisfactory. In some cases the cords are cords wrapped without a carrier, but maintaining a regular, but nonetheless, small space between the cord is extremely difficult. They are generally wound so that adjacent edges touch. This results in a significant non-uniformity in the elastomeric matrix of the hose, which is a potential Is weakening that must be counteracted, and as it is important, the cords as good as possible saturate with glue and use a well-twisted cord, which is very expensive. In a similar way Way, where the cords are worn on a liner, this must be well impregnated with adhesive (latex) to avoid unevenness in the rubber matrix of the hose. It has also been suggested embed the cords in a matrix of rubber at regular intervals by calendering to create a to produce composite film which, as shown above, can be cut into a reinforced tape. In this case too, however, a well-twisted cord must be used to prevent impermissible flattening to avoid when calendaring. The working conditions cause an extremely high proportion of elastomer to the Cord, which increases the cost of manufacture and the finished hose.

It is therefore the object of the invention to provide a construction a composite film with parallel, spaced

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arranged cords made of highly tensionable single thread Specify material that is in a .Matrix of elastomer. embedded, whereby the disadvantages mentioned are avoided or mitigated «

The invention relates to an improved helical Reinforced hose with appropriately distributed cord reinforcement with a high Cordr-Blastomer ratio.

Another object of the invention is - one High-quality, helically reinforced hose and composite cord-elastomer films for this-at low levels Costs due to the use of practically untwisted, so-called producer yarn.

The invention consists in a material for a composite film with cord threads arranged in a distributed manner preferably untwisted continuous thread-yarn that are embedded in a matrix of curable elastomer, the matrix (if it is not uniformly thick) has a maximum thickness equal to that of the cords of 16oo to 8000 per cm larger than the cord thickness, the space between the threads being 1/4 to 4 ~ times, preferably 1/2 to 2 times the cord width is.

The cords normally become symmetrical in the matrix arranged as a coating over each thread, i.e. to the surfaces of the film, and as a connecting sheet runs between adjacent cords. The fat the coating is therefore from 800 to 4,000 per cm, usually i2oo to 24-00 per cm, while the thickness of the web between the threads is usually not greater than that Thickness of one cord plus the thickness of the coating

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on one side of the thread is »The film will therefore normally have a ribbed appearance, with thinner areas between the threads, ie the difference between the film thickness on and between the cords depends on the diameter of the thread, the thread spacing and the type of thread elastomeric material used to make the matrix as well as the process used to make it. In a common case where latex is about 60 % solids and a gap between the threads is equal to the thread size, the thickness of the resulting coating of coagulated latex over the thread has been found to be 1,600 to 2,000 per cm and the thickness of the web between the yarns differed little from 1,000 per cm and in the range of cord diameters from 1,000 to 28,000. In general, the smallest sheet thickness is 8,000 per cm.

In the above, the cord is more or less round before it is embedded in the matrix, while the cord thickness and width refer to the cord in the matrix, where the gord thread is somewhat flattened here in some cases.

The composite sheet material according to the invention has many advantages. Especially in comparison with earlier proposals it is noticeably cheaper because it is made of ordinary yarn and relatively little elastomer can be produced without the quality of the finished hose being adversely affected the quality of the finished hose itself has been found to be excellent in many cases because of the clearances between the threads that allow the introduction of unevenness avoid in the elastomeric body of the hose without inserting an outer carrier, which itself represents the possibility of a weakening,

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and without the use of a relatively massive one Body made of carrier elastomer takes place, which would prevent the desired · high concentration of reinforcing cord.

One amendment instead of using single outer threads of high tension corduroy threads made of metal wire used.

Various techniques can be used to produce the composite sheet of the invention. In general, it is preferable to coat parallel cords with the elastomer in an aqueous emulsion, that is, when a latex is the. Coating is when a continuous matrix runs over and between the cords and then becomes coagulated. The cord threads can, however, also be developed between preformed slastomer films, which are then sealed with a hot seal, whereby they butt against each other between the cord threads.

In a method "according to the invention, the cords embedded in latex parallel to each other at a distance, sprayed on or applied as a pressure jet or by extrusion. In the latter case, the cords can through a Extruder nozzle are guided in the form of a slot, of which, if desired, an enlargement in alignment with every cord can have. The resulting unstable Wet film is then treated to coagulate the latex, either by passing it directly into a coagulating bath or, in the case of heat-sensitive latex, by guiding it through a heated chamber.

Another method according to the invention becomes thin Sheets made of rubber latex, for example by applying the Latex on heated rolls, and the card threads, which are arranged in a distributed fashion, are placed between the freshly made

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th films developed while they are still in such a state that they are under light pressure tie together. The two hummi films are then squeezed together around the cord to make one enclosed Movie.

In the "previous description, the material used is the matrix For example, a curable elastomer suitable for use in a hose made of elastomeric material has been preferred which is subjected to hardening as a whole when it is completed. There is an advantage of the invention in that the relatively thin matrix of elastomeric material that forms the basis of the reinforcing sheet is used, well hardened or by 7 / change of. hardening or vulcanizing agent from the surrounding Body of the hose material is vulcanized, although the inclusion of a hardening agent is not excluded is. In the case of a modification, for special applications, such as the construction of a hose ahs FVC-Nitril-Gtaami, thermoplastic film material is used instead of curable elastomer for the matrix. This can by extrusion or better by layering the cords arranged in parallel between preformed ones Film around and between the cords. In this way you can create a reinforced film for a FVC nitrile rubber hose plasticized PVC can be used. In this case, the matrix thickness can be significantly less than that listed The thickness of the layer over the cords is 4oo to 4ooo per cm and the thickness of the web is between the Cord is about twice the layer thickness.

The invention is described with reference to schematic drawings. In these is:

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FIG. 1 is a side view of the apparatus for extruding a latex sheet with cord reinforcement;

FIG. 2 is a view of an extruder nozzle;

Figure 3 is the cross-section of a resulting composite Foil;

Figure 4- is a side view of an apparatus for developing cord reinforcement between freshly machined Latex foils

FIG. 5 shows the cross section of a film.

Figure 6 is a side view of the device for manufacturing a composite film, similar to FIG. 5, by immersion treatment 5

FIG. 7 is a side view of a device for layering Cord reinforcement between thermoplastic films, and

FIG. 8 the section through a composite film _o

As FIGS. 1 to J show, there is a number of inventory roles 1 thread pulled off and around the guide rollers and 2 (each of which is grooved or with combs for holding of cords 4- is provided that are 1/2 to 2 yarn widths are away from each other) by a latex tape 1o and then passed through an extruder nozzle 5 into a coagulating bath 11, from which the resulting composite film 12 (shown in Figue J in cross-section on a larger scale) around the rolls 6 and 7 is passed through a dryer 8 to a take-up roll 9. If wanted, the film 12 can be put together with a corresponding film on the roll 9.

Figures Λ and 5 show how the yarn is fed from the supply rolls 13 over combs 14 and I5 and the

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the desired distance. The cords then arrive between the two heated rollers 16 passing over the "leak" or transfer rollers 17 latex from the tanks 18 transferred to roller 16. This latex dries up. Should -and results in a fresh film that is gentle is pressed onto the cords 19 and so an enclosed one Matrix forms. The resulting film is then wound on the take-up reel 21.

The resulting film has a cross section according to FIG. 3i in which the cord threads, which are somewhat flattened are included in the rubber matrix 22.

The device according to FIG. 6 is an alternative to that according to FIG. 1 for coating the yarns or cords with latex. The cords 4 are drawn off from the supply roll 1 and passed over a comb 12 to form a composition to result from parallel, distributed arranged cord threads, which then around the guide roller 2 in and through a latex tank 1o be performed. Put in this tank the guide roller 5 and a stirring roller 23 ensure that the latex remains homogeneous, and also serve to moisten the individual yarns through the latex. The resulting, latex coated film is then passed through two doctor blades 24 to scrape off excess latex, after the film has been pushed through a bath 11 with dilute acetic acid (1 to 2%) to to coagulate the latex. The film then passes through a. Rinse water tank 24 and through a nozzle tunnel 25 with cold air to dry. Finally, it is wound onto a drum 21 on which it is placed with an intermediate line of fabric it is occupied 26, which is withdrawn from the supply roll 27.

Figures 7 and 8 show a modified arrangement,

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in which the Oordfäden 4, which are withdrawn from the rollers 1 between films 28 of thermoplastic material are layered, which is withdrawn from a supply roll 19 will. The whole thing is pulled together by the elastomer-coated rollers Jo through the trick, passed between the films and yarn, and then arrives the composition on a rotating belt 31 » above which a heat sealing device 32 is arranged i & t putting pressure on the film between the yarns. the Films lying on top of one another are hot-welded there. Eventually the resulting slide will be on the roll 34-. wound. A cross section of this slide is to see in Figure 8, in which the yarns 4 between the plastic films 28 are embedded and a web between the yarns or cords of about twice that Thickness of the individual films 28 result. Instead of using the heat sealer 32, the Films also by electrostatic forces or by a ' Solution or glue held together. Am Complete sealing is: not essential if the two films fused together during the manufacture of the tubing are.

The elastomer normally used in practicing the method of the invention is natural rubber in the form of latex, although the use of other synthetic or modified natural elastomeric rubbers is not excluded. The latex preferably has the normal strength of about 60 % solids, although higher concentrations such as those in creamed latex at about 7 % solids, as well as more dilute latex such as that commercially available as "low concentration" at about 40 % solids or more dilute material down to 2Ό% solids can be used. The thinner the latex compared to that

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The 6ο% standard material, the more water you need removed during treatment. As previously shown, the measured thickness of the dry latex will vary over the Gord threads when using latex with 6o% Solids in many samples between about 0.1 and 0.15 µm · The thickness of the latex sheet between the yarns in coagulated form is at about 0.62 to 0.75 imi above a wide range of the Gord thickness constant. However, these are only guide values that can be made more practical through measurements Samples have been detected and thus vary according to the various parameters already mentioned such as cord interstice and lateK concentration.

Although the invention has been described in connection with the use of untwisted, continuous single wires, ie yarn made from bundles of continuous single wires that are little or not twisted, the use of more heavily twisted gord threads is not excluded. The term "untwisted continuous filament yarn" means in particular what is known in the trade as producer yarn which has heretofore been subjected to twisting which considerably increases the cost before use as a hose reinforcement. The term "untwisted" means that it has not been subjected to twisting, although it may have very little twist from a twist to 50 to 100 mm. Usually a polyester yarn is used, although very span tenacity yarn, for example are not excluded ₀ of polypropylene.

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Claims (12)

". ■ -.- ■■ - 11 - -. ■■ Ü, flKT.1973 74-12-GE THE GOODYEAR ■ TIRE. & RUBBER GOMPAHI , Akron / Ohio - USA Claims Λ J material for a composite film, characterized in that distributed cord threads of continuous thread yarn are embedded in a matrix of "curable elastomer or film-like thermoplastic material, and that the matrix (except for uniform thickness) has a maximum thickness in alignment with the Has cords of 16oo to 8000 per cm, which is greater than the thread thickness with a gap between the threads of 1/4 to 4 times the thread width, _o 2. Material according to claim 1, characterized in ₉ that the yarn is an untwisted, continuous'. filamentary textile yarn is. 3 «material according to claim 1, characterized in that the yarn contains cords made of metallic wire. 4. Material according to claim 1, 2 or 3? characterized, that the space between the Gord threads is 1/2 to 2 times the thread width 5 · Material according to the preceding claims, characterized in that the matrix is used as a connecting web runs between adjacent cords and as a coating over each cord and that the coating thickness in the case of thermoplastic material, it is in the casting of the elastomer from 800 to 4-OOO per cm is located, the sheet material has a fluted shape. 409820 / 07B2 6. Material according to the preceding claims, characterized characterized in that the matrix contains a hardenable elastomer which is free from hardening active ingredients. ; 7. A method for producing a material according to claims 1 to 6, characterized in that the Oordfäden are aligned in parallel as a single layer, be coated with curable elastomer in aqueous emulsion as a continuous matrix, which over and passes between the cords, and then exposed to the conditions that coagulate the emulsion result. 8. The method according to claim 7? characterized, that the emulsion is applied by dipping, spraying, as a blower jet or by extrusion. 9. The method according to claim 7 »characterized in that that thin films are freshly made from an elastomer emulsion and the parallel aligned cords are developed between the films while they are still in such a state that they are under Tie the pressure together, pressing the two foils together around the gord threads and so on > result in an enclosed film. 10. The method according to claim 7 »characterized in that that the cords aligned parallel as a single layer and between prefabricated thermoplastic films Material are layered, which are then amalgamated between the cords by applying heat and pressure. ·, 11. The method according to claim 8, characterized in that the cord threads, which are formed as a single layer in parallel -13-409820 / 0752 directed through an extruder nozzle, from the film-like thermoplastic matrix material the cords are extruded around and coated and chained. ■ 12. Hose made of a material according to claims 1 to 6 and by a method according to claims 7 t »i" S 1 "1 _5, characterized in that the strip matrix contains an Elastomer_containing a whole hardened body with additional in radial , elastomer applied in an inward and outward direction. 13. Hose according to claim 12, characterized in that that the strip matrix is thermoplastic film-like Contains material that covers an entire body with additional, compatible body material 'of the tubing, which is directed radially inwards and outwards. 14-. Hose according to claim 12, characterized in that that the thermoplastic material is plastic, ejltes polyvinylchloride and the additive includes poly (nitrile rubber). 409820/0752 Blank page