DE1937945A1 - Method of making a hose - Google Patents

Description

Process for making a hose _:

The invention relates to a method for animal placement flexible hose by applying an inner tubular rubber layer to a mandrel and a wound or braided reinforcement made of metal wire or single-thread synthetic material, whereupon over the Reinforcement a tubular outer layer made of synthetic Rubber is extruded and finally the entire hose is vulcanized; '

The extruded outer layer can be in the extruded state be provided with a smooth outer surface, because such a smooth outer surface on the finished hose is used by the Buyer at an expensive hydraulic hose that is used for hydraulic systems in plug tool construction or similar purposes.

If precautions are not taken, the disappears smooth surface during vulcanization, because the unvulcanized rubber of which the outer layer is made

IANKi BAYER. MORTGAGE AND EXCHANGE BANK MUNICH. THEATINERSTR. 11. ACCOUNT NO. S 417 37 POSTSCHECK ACCOUNT MÜNCHEN If 4M TELEQR.ADDRESSE PATENTWENST MÜNCHEN

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rend their treatment is very easily damaged. Ί / enn furthermore, the hose is vulcanized in a transfer autoclave water droplets condense on the surface of the hose, evaporate thinly and leave unsightly stains,

In order to smooth Außenfininh erhalten-, .wurde in practice over the tube prior to curing an outer lead layer extruded "Another known method consists in that the hose is vulcanized in a Metallforin without any external · -Beschientung. Neither of these ψ methods is particularly satisfactory. Coating with lead "is expensive" and easily leads to extrusion spots on the outside of the hose. Furthermore, the lead coating is not "always ^{extruded exactly concentrically with the hose 5} , which ^; Removing the lead layer after vulcanization with a slitting knife can damage the hose, metal forraen are very expensive because a different shape is needed for each hose size. Furthermore, the forms tend to lose their surface finish with repeated use and then characterize the hose - outer,

According to the invention we proposed in the method of the type mentioned at the beginning, according to which, after the extrusion of the; ^{It has a} synthetic Gunei outer layer and a thin layer of elastic rubber is applied to the hose before vulcanization and is stripped off after the vulcanization process. The surface finish of the synthetic outer layer of the hose is thus achieved with an expense of only the relatively low cost the rubber protective layer,

Vulcanization can be done in any suitable manner and proceeding according to the invention can also Can be used with advantage in conjunction with lead coating equipments or metal molds as the rubber layer

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BATH ORIGINAL

the actual hose from extrusion marks, damage from slitting knives and impressions of faulty ones Protects forms.

The particular advantage of the invention is that the vulcanization in a Ducipfauioklave or a Liquid bed vulcanizer, i.e. a vulcanizer in which the hose is pulled through a mass of fine glass balls which is liquefied from below by a stream of air or steam.

The inner liner tube is of course made of synthetic rubber if the tube is to carry oil and other liquids that attack natural rubber. The wires forming the reinforcement can be around the hose in the form of a band of touching wires that connected by rubber, be wound. The extruder for applying the outer layer expediently contains one Evacuation device to evacuate any steam or air that may be trapped between the layers of the hose. On the other hand, the hose can be on its way to the extruder also be subjected to heating, in an air or DaapfelnaohlnB la Sohlauoh χα prevent. If desired, an adhesive, for example a solution made of synthetlsohea Gaul, before the extrusion of the outer layer on the reinforcement, among other things to improve the connection of the outer layer of the reinforcement.

The outer layer as well as the inner lining tube can be made of any synthetic rubber, e.g. Polyvinylchloride Acrylnittil, neoprene, Hypalon or butyl rubber.

The protective layer can be made of natural rubber or inexpensive synthetic rubber used for common purposes.

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stand and usually has a thickness of 0.5 to 0.75 mm. It can be applied very well to the entire tube by extrusion in the unvulcanized state, with it in this case is attached, through the extruder one Free to insert lengthwise wire into that layer and the outer surface of the outer layer is inserted. This wire can be pulled out after vulcanization in order to tear open the protective layer. If the protective layer is applied in a non-vulcanized state, a suitable release agent, e.g. a silicone oil, is applied to the outer tube of the hose before the protective sole is applied to ensure that that the protective layer does not bond with the outer layer. With short hoses up to 30 m in length, the The protective layer can be a vulcanized rubber hose that is pulled onto the hose via a mandrel. In the case of short hoses, a rigid mandrel can be used, but in the case of long lines of 200 and more length, a flexible mandrel must be used Dorn, ζ.B. made of nylon, which is also coiled · The nylon mandrel can be made from a massive or old through a central hole Stand up "

In a typical production example for a long Tube, the flexible mandrel is pulled from a spool through an extruder that holds the inner rubber lining tube forms, cooled and rewound. This hose is then pulled through a knitting machine, which applies the reinforcement wire mesh, whereupon it is wound up again will. Then this smart is carried out through another extruder, which has the 'outer layer made of synthetic Applying rubber. After cooling, it is rewound. Finally, this overall hose is followed by a last Extruder pulled, whereby it is provided with a coating of silicone oil on the way there. In this extruder

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the coating is made with elastic rubber and a fine wire is inserted. This final build will be folded lengthways in a trough and can then be put in vulcanized in a steam autoclave. After that, the Protective layer torn and removed.

If a long hose wound on a drum is to be vulcanized in a steam autoclave, the hose should be wrapped with cheap fabric on the outside to keep the hose taut and to prevent deformation under the stresses on the drum.

The process is illustrated schematically with the aid of the drawings. It represent

Fig. 1 is a perspective view of the hose before

Vulcanizing, Fig. 2 different process steps for production

of a sole according to FIG. 1, 3 shows the stripping of the protective layer and FIG. H removing the dome

The hose in FIG. 1 is located on an inner mandrel IO and consists of a guami lining 11, a braided reinforcement 12, an outer layer 13 made of synthetic Guami, an elastic rubber protective layer Ik and a tear wire 15.

Fig. 2 shows a complete sequence A to E of the required process steps for producing the hose according to Fig. 1, The wavy lines between the work stages are intended to indicate that the hose is not continuous τοπ a stage to be dealt with next.

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In Step A, the mandrel 10 is moved through an extruder l6 _f of applying the lining tube Ii. In stage B, the thread is drawn through a knitting machine 17 which applies the braided reinforcement 12. In stage C, the structure passes through an extruder 18 which pulls the synthetic rubber outer layer 13 on. Then, in stage D, an extruder 19 is passed through for introducing the wire 15 and for applying the protective layer IA. This hose is then placed in a steam autoclave 20 for vulcanization. It can also be drawn through a liquid bed vulcanizer.

After vulcanization, the wire 15 is pulled out, as shown in FIG. 3, in order to tear off the protective layer 1h. If the hose is made in relatively short lengths and a rigid mandrel is used, then the mandrel 10 is removed by rollers 21 as shown in Fig. K. A stop 22 prevents the sole from being carried along.

If a sole is made of great lengths, then a flexible nylon mandrel is used and the hose is wound up between the steps as required. In this case, the mandrel is ejected from the de-vulcanized hose by fluid pressure.

Typical by-apples are listed below!

example 1

A hose for use in a hydraulic circuit consists of a lining made of an acrylonitrile-synthetic-rubber compound, a reinforcement mesh made of very tensile strength Steel wire and an outer layer made of a synthetic rubber compound, which is based on a mixture of polyvinyl chloride and acryionitrile polyaeren and it is as follows manufactured:

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A steel mandrel with a diameter of ½ inch and a length of 20 m is covered with an extruded hose made of an aorylonitrile synthetic rubber compound with an inside diameter of ½ inch and an outside diameter of 5/8 inch. A reinforcement layer is then applied to the extruded hose by wrapping twenty-four bands of very tensile steel wire clad with brass, each of the twenty-four wire bands comprising seven wires, each 0.28 mm in diameter and 25 t / cm tensile strength. The outer layer of a polyvinyl chloride-acrylonitrile-synthetic rubber compound is then extruded over the wire mesh with an outside diameter of 2.25 cm. During this process, a vacuum is created in the extruder head in order to remove as much air as possible or any volatile material that would otherwise be trapped under the extruded tube. The sole formed in this way is then coated by extrusion with an elastic, 0.75 mm thick protective layer made of a natural rubber compound. During this process, the hose outer layer is coated with silicone oil on its way to the extruder in order to prevent this outer layer and the protective layer from sticking to one another. A vacuum is used during the coating process to again evacuate any air pockets or volatile materials. A wire with a diameter of 0.28 ma is now inserted together with the hose into the head of the wheel so that the sucker can form over it. The hose with soles is then placed on a suitable surface in a steam autoclave and vulcanized for 30 minutes at h kg / cm steam pressure. After vulcanization, the coated hose is removed from the autoclave. The wire underneath the protective layer is removed by pulling the end of the wire about 90 degrees to the longitudinal axis of the hose, so as to tear the protective layer. The protective layer soled in this way is now quickly removed from the Schlauoh and the steel mandrel is pulled out ·· of the hose.

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Example 2 When making a similar one approximately 200 η long A flexible nylon mandrel is used for the hose.

The hose is manufactured similarly, old with the exception, that the great length requires a winding of the hose between the individual operations.

After the protective layer has been applied, a cotton fabric is temporarily used to protect the protective * The sole and the smart thing inside are wound up in a spiral. Then the Schlaiioh is on a drum wound up and vulcanized in a steam autoclave; the temporary enveloping is removed again. the The protective layer is then removed and the cunning man is freed from the thorn by applying such a high water pressure to the end of the sole ear that the water penetrates between the inner surface of the sole and the thorn surface and finally pushes the thorn out of the cunning.

Example 3

A Hydrauliksohlauch consists of an inner lining of a polychloroprene compound, a reinforcement made of) tensile steel wire is braided in two Sohiohten with an intermediate layer of resilient natural rubber and from a "ußenschioht from a Polyohloropren compound ·

A steel mandrel 1/2 inch in diameter and 20 m in length is attached to an extruded hose made of the polyoloroprene rubber compound with an inner diameter of 1/2 inch and an outside diameter of Ο.65Ο inches plated · One The reinforcement layer is then made by winding up twenty-four strips of very high tensile strength, plated with brass Steel wire applied to the extruded hose, wherein

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each of the wire bands comprises eight wires, each 0.28 mm in diameter and 25 to / cm tensile strength. A second reinforcement bar θ is braided from the same number of wire ties, but from new wires. An intermediate layer made of an elastic, natural rubber compound of 0.38 mm is inserted between the reinforcement layers, namely when it is fed into the knitting machine together with the product during the manufacture of the second layer. An outer layer of a polychloroprene compound is then extruded over the second layer after it has been provided with a connecting agent made of a polychloroprene compound dissolved in toluene.

The hose created in this way is then extruded with a stretchable, 0.75 nm thick protective layer made of a Styrene-butadiene-rubber compound coated. This process and the following steps to complete the procedure are the same as in example 1.

example H

A hydraulic sole consists of an inner lining made of acrylonitrile synthetic compound, a sole made of nylon leno fabric, four layers of spiral-shaped wire reinforcement, each with a thin base made of a polychloroprene compound, and an outer layer from a chlorosulfonated polyethylene "Hypalon * Syntheseguami compound".

A steel mandrel of 3/8 inch Burchaeeser is covered with an extruded hose made of acryionitrile-Syntbesegümmi with an outside diameter of 1/2 Έοΐΐ. A fine nylori-leno fabric is wrapped fipirally over the lining; to achieve Vin ^r eiriö stabilizing pad, as long as the "overlying ^ layers. Four Sohlchtetr ⁴ from zugfestein Stälirärähten spirally

applied, each with an underlay of a 0.28 mm thick polychloroprene sole. The wire layers include brass-coated steel wire with a diameter of 0.38 mm and a breaking strength of 25 to / cm, with layers 72, 72, 75 and 75 wires included to the first, the second, the to form third and fourth layers. The wire layers are wound alternately to the right and left, to achieve a balanced structure. A window from a "Hypalon" connection with an outside diameter 1.12 ca is then extruded onto the hose, which then has an outer diameter of 1.12 cm.

The hose created in this way is extruded with a stretchable, 0.75 µm thick protective layer made of a styrene-butadiene-rubber compound overdrawn. This process and the following steps are the same as in Example 1,

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Claims (6)

Patent claims: A method for producing a flexible hose, characterized in that an inner lining made of rubber is molded onto a mandrel, and one over this lining Reinforcement consisting of metal wire or plastic thread is wound up or braided, then an outer layer over it is extruded from synthetic rubber, whereupon about this Outer layer a thin protective layer made of elastic rubber is provided, finally this hose sole structure is vulcanized and finally the protective layer is pulled off the hose and the mandrel is removed. 2) Method naoh claim 1, characterized in that a Protective layer applied by a dioke of 0.5 to 0.75 ma will. 3) Method naoh claim l, characterized in that the Protective layer is extruded onto the hose in an unvulkanieiertea state. 4) Method naoh claim 3 »daduroh characterized in that a fine, longitudinally extending wire duroh the extruder between the protective layer and outer layer and inserted the wire is pulled away after the extrusion to tear the protective layer. 5) Method according to claim 1, characterized in that the hose is vulcanized in a steam autoclave. 6) Method according to claim 1, characterized in that the hose is vulcanized in a liquid bed vulcanizer will. . 909885/1484 , -41-. Blank page