DE2018930A1 - Manufacture of pneumatic tires - Google Patents

Description

OR-MDUER-BORe DJPL-PHYS, DR.MANITZ DJPL-CHEM. DR. DEUFEL DIPL-ING. FINSTERWALD DfPL-ING. GSAMXOW

PATENT LAWYERS

2 018 9 3 Q

April 19, 1970 Gs / Sv - D 1152

THE DTJITjOP COMPANY LIMITED Dunlop House, Ryder Street, St James ¹ S, London SW1, England

Manufacture of pneumatic tires

The invention relates to the manufacture of pneumatic tires.

According to the invention, a method of making a Pneumatic tire involves forming a tube of reinforced., Resilient, elastomeric material, the circumference of which is approximate equal to or less than the circumference of the bulge regions of the Finished tire is expanding the drill to the circumference of the tube to approximately equal the circumference of the crown area of the finished tire, the joining or gluing together at least one strip of unstretched material to the outer periphery of the tube and letting the stretched material relax on either side of the strip and let it rest essentially to the girth before stretching.

Preferably the material adhered to the strip remains substantially in a stretched condition.

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The unstretched strip can, for example, have one or more breaker layers or an extruded tread rubber strip. If necessary, it can be suitably supported so that its diameter remains approximately the same as that of the crown area of the finished tire when you do this Tubing material can relax.

To complete the manufacture of the tire, bead wires and chafer bands can then be attached to the ends of the Attached to the cylinder, the rings held in place by twisting the ends around the beads, the tread and / or the sidewall rubber is used as required and the tire is molded and vulcanized.

An example of the implementation of the process of continuous Manufacture of pneumatic tires according to the invention consists in making a substantially cylindrical tube To form reinforced, resilient, elastomeric material, which has a diameter approximately equal to or smaller than the diameter of the bead regions of the finished tire, the tube in sequence through or on a plurality of Process stations, with the at each station procedure carried out on vreist: at the first station to enlarge the tube diameter a diameter approximately equal to that of the crown areas of the finished tires; at the second station the arranging of strips of unstretched material around the circumference of the tube in adhesive contact and in a coaxial arrangement on it, each of the strips or each of the groups of strips being separated is arranged at an axial distance from one another; at the third station d-is separation of the tube between two adjacent ones. Strip and then let yourself relax. so that the edges formed during separation go back a Durohmesser, which is essentially glekh

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the one who is tube before stretching "at the second station,

and the. material that is adhered to the strip

or the strip is "substantially in the stretched state".

Any of the strips arranged around the tube can have one or more layers of rubberized fabric to provide a breaker and / or a layer of extruded elastomer en material and thus to form a tread and / or cross winds for each tire. Every stripe even fconn, due to its construction, the tube in keep their stretched state; if, however, it tends to f to contract, it can be suitably supported.

When the tube is severed, cylindrical portions are formed, each of which has a beadless tire carcass having a breaker and / or a tread strip adhered thereto. The tire is completed by attaching a bead ring to each end of the cylindrical part by twisting the edges of the tubes around the bead ring © in a conventional manner, using any required rubber on the part (e.g. in the case of a carcass with an attached breaker, the required rubber is the tread and side λ

.W8iidkautsch.uk) and through the complete design, molding and vulcanizing the tire in a known manner. The rubber can be injection molded in strip form or by centrifugal casting.

The tube can be shaped in a number of ways, the method used depending on the material used and the end product desired: eg a tire, the egg tip. Yrv> esp η ^T iiit TXinpronal- or Rnrl-i.? ^Ί - nfbau with the desired number of 13-7 layers.

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The tube can be formed from a strip of reinforced, elastomeric material, and the reinforcement can be "bulletproof" cord and the warp cord can extend longitudinally of the strip. The strip is bent over to form a tube, with the two longitudinal edges lying next to one another and a seam being formed. The seam, and therefore the warp cords, can extend axially of the tube so that a tire with a radial carcass is formed, or spirn ¹ förrcp. <? ° o uaü fciu Rf-I ■ "«> IHM- r ·>.? .. £ -η lixag ^ iin]! '■'! ■ "knssp arises. The carcass is made to the required number of ply plies by wrapping the tubular material either radially inward or radially outward as often as necessary, with each of the bent parts being coaxially arranged. This turning step can be performed shortly before or at the same time as the step in which two bead rings are attached to the beadless carcass.

Alternatively, the tube can be extruded: for example by a process essentially as described in the United Kingdom Patent application 30414/68 of June 26, 1968 is described.

The tube material can have a porous elastomer: e.g. foam made of cross-linked polyurethane with which a reinforcing cord has been connected. The tread and sidewall chew can be applied to the carcass with an injection molding or centrifugal casting processes, e.g. as described in British patent applications 9600/65 dated 6/6/1965, 54225/65 of December 21, 1965, 5861/68 of February 6, 1968 and 5860/68 of February 6, 1968, the rubber flows into the porous elastomer so that not only is the finished tire impermeable to air (i.e. it can be a tubeless Be mature), but it was also a good connec-

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established between the carcass and the tread and / or the sidewalls.

An example embodiment of a device according to of the invention for the production of a pneumatic tire by means of forming a tube of reinforced rubber-like material having a circumference approximately equal to the bead regions of the finished tire, by means for expanding the material to increase the circumference to a value approximately equal to the crown area of the finished tire isb, and by means of starting f bringing a strip of unstretched elastomeric material into adhesive contact with the outer periphery of the tube.

A vielt ere embodiment of a device according to the invention for continuously producing pneumatic tire characterized by Mitbei for forming a substantially cylindrical tube of reinforced elastomeric material having a diameter equal to the diameter of the bead regions of the finished tire is approximately, by conveyor for passing the tube through or past the following devices: firstly, a device for enlarging its diameter to a diameter that is g

is approximately equal to the diameter of the head portions of the finished tire, second, a device for holding the tube in its stretched state and, thirdly, a device for separating the tube between two adjacent strips.

The invention also includes one made by the methods or devices indicated or described later tire.

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The invention is illustrated in the following, for example, with reference to FIG Description of the drawing, the single figure of which is a graphic representation of the development steps of a tire according to FIG of the invention shows.

The drawing shows the manufacture of a tire with a radial ply carcass. A web made of porous Elastomer, in the form of a cross-linked and flexible, foamed material such as polyurethane foam, is made of a Roll 2 unwound, guided around a roller 3, with a Glue is sprayed from a spray gun 4 and passed through the holding rollers 5. Conventional "shotless" tire cordware 6 is unwound from a roll 7 and through the holding rollers 5 in contact with the adhesive-coated Foam led. The width and arrangement of the foam and cord are such that the resulting laminated The web is as wide as the length of the circumference of the one to be used bead wires measured around their inner circumference with an additional 1.27 cm (1/2 inch) of non-laminated foam protrudes over a side edge.

The web is next gripped between small, powered rollers 8 which are arranged to hold the sheet Shape into a tube, with the holding rollers rolling on the web with the foam layer on the inside of the tube. The non-laminated, protruding foam edge is covered with an adhesive by a roller 9 from a bath 10 and connected to the other edge to complete the tube and join its seams.

The tube is extended in the circumferential direction by further Rollers 11 stretched to a diameter which corresponds to the inner diameter of the breaker ply in the finished tire.

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While the tube is stretched, four become Superimposed, unstretched breaker ply layers 12 attached to it.

These breaker ply layers were previously made by layering cord and 1 mm thick foam (that of the same Kind, as mentioned earlier, can be) and made by diagonally cutting strips to an angle of 16 ° between the cord and the main axis of the strip. The plylage are at four stations A, B, C and D applied, one ply at one Station to train a four-ply breaker position in which " the ends are at four spaced points around the edge of the attachment and where the cord thread in each plylage form an angle of 32 ° with those in the plylage below.

The groups of breaker layers are arranged at intervals along the tube so that the Zvjischen space between two adjacent plylage groups equal to twice the length the tube that is obtained in the next step described.

The tubes will then be in the middle between two adjoining Λ cut the Plylagengruppen to a separate section 13 which can relax freely, and thereby shown to its original diameter at both ends, as in 14, is returned, but the stretched substantially and does not stay relaxed in the immediate vicinity of the breaker position ".

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This build is next on a collapsible Tire building machine ge Hirt, the beads are aligned, the tube ends are twisted over the beads, as shown at 15, and in this position with glue fixed.

This is due to the length of the tube between two groups of plylies possible. Such a construction has a carcass ply. Alternative options are then discussed Referenced.

The assembly is removed from the tire building machine and placed over an inflatable core on a centrifuge mounted tire mold 16 brought. Mixed, liquid polyurethane prepolymer and vulcanizing agent are used poured into the rotation mold and can settle. The tire with the cord completely soaked with the polyurethane and the soaked foam is made then removed from the mold and subjected to a post-vulcanization treatment.

Various modifications of the embodiment just described are possible so that the end product is a tire with a carcass with a radial p] y or cross ply construction or a belted tire.

The elastomer that forms the composition with the cords Material must be able to expand enough to allow the diameter of the tube to be from the diameter of the beads up to which the crown can enlarge and must be elastic enough to return the tube to its original diameter can return when or where the ^ wi \ a £ is taken away will. This elastomeric material does not need as in the

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embodiment just described may be porous, but it can be, for example, a thin sheet of vulcanized or partially vulcanized low modulus rubber be. There must be good adhesion between the tube and the tread and sidewall rubber, and. either “by chemical bonding or by penetration into them, if a porous material is present. That supporting, elastomeric material for the Brenkerlage can as with a conventional tire, it is also unvulcanized Be rubber.

When a porous support material, such as foam made from reticulated Mateial is used, the cords can be glued to the foam either by flame lamination local parts of the foam surface melted by a flame and the melted material serves as an adhesive for the cords, or through the use of an adhesive that is sprayed, spread on, or through a film transfer process can be attached.

Are two plyla ^ en in the carcass, especially in the

Sidewall, required, is the distance or the inter- ^

The space between the adjacent groups of breaker ply layers on the tube is enlarged so that the tube ends can be twisted around the bead wire up to the breaker position or up to the opposite bead wire.

In this case, the cords that make up part of the Form a base layer, be embedded in foam, which is laminated on both sides to prevent “me touch the cords in the two ply layers. Several Plylage can be formed in this way by several coaxial envelopes,

BATH

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If a non-porous support material is used, the cords therein can be extruded, calendered, or embedded by other methods.

Any type of cord used in conventional tire construction can be used, either in the form of the conventional "shotless" ware or from a Single cord taken from the factory. Appropriate cord treatment may be required to obtain a satisfactory one To maintain cord / rubber adhesion.

The invention is particularly suitable for automatic manufacture, in which a large part of the final Tire is made before an island item is created. In this way the IIi? I..dhabung and the transport from station to station reduced to a iiinj mum .

9-84 5/1 342 BAD ORIGINAL

Claims (1)

201893Q - 11 claims (1.; Method? For producing a pneumatic tire, thereby g e k e η u shows that a tube made of concealed, resilient, elastomeric material, its scope ann ^ horuo is equal to or less than the circumference of the bead regions of the finished tire shaped -; i? 'd, Ίτί .lie R '^ lire, uivi approximating the circumference of the tube bi.-e-u equal to the extent of the eron area of the finished tire zu ver ^ rö'i ^ ri ;, stretched or ^ noble t-ird, daii at least: - eir strips of unstretched resp. 4 - stretched Katerial glued together with the outer circumference of the tube viird and that calibrate the stretched -or. Relax the stretched material on every application of the Stiroifex-B and can come back to substantially the same size as before the stretcher. 2. Verfaiireix after opening 1, characterized GEK ^ra h ρ c eic Ii net, <ν · ° ö ^r -F- to de ^v i strip aHgekiebt ^ r ^T a ο ex'j. al im j '^ tli';"'° ^r ' ir O ¹⁰ P 'f ^ CKueia υ ·",' - :. ■ ·· 5. VerfaliX'er incli Annp ^ uch 1 udei ¹ d. thereby g · ⁿ ke η η - ζ eic Ii η et, aaP the tube is supported, wmi the tubes can relax. 4. A method for the continuous manufacture of pneumatic tires, dadup ^ ch ^ eken η, that a substantially cylindrical tube of reinforced, resilient, elastomeric} K material is formed, which has an approximately f * lßif.; Hen or smaller diameter, aJ s der Dn? 'chmepser (\ uv v / u? ntregionen of the finished tire, that the agitator of the row noon by' or hi a multitude of gate drivers,; s: j '' - l,; o.'iei ) y-rbeigef 'ahr \. wir.l that at, everyone 0 0 9 8 4 5/1342. . ^ BAD original 201893Q Stetion performed process step includes: at the first station to enlarge the tube diameter to a diameter approximately equal to that of the crown areas of the finished tires; in the second station the arranging before <stripes off not stretched material around the circumference of the tube in adhesive contact and in coaxial arrangement with it, being Each of the strips or each of the strip groups are arranged at an axial distance from one another, in which third station separating the tube between two adjacent strips and then letting it relax of the tube material, so that the Separating edges formed go back to a diameter substantially equal to that of the tube before the Stretching at the second station is, and the material that is adhesively bonded to the strip or strips stands, remains essentially in the stretched state. 5. The method according to any one of the preceding claims, characterized marked that the tube or the cylinder is made from a flat strip of reinforced, elastomeric material is formed which is formed into a tube in the longitudinal direction of the strip, and that the side edges of the strip are formed into an axially extending seam. 6. The method according to any one of the preceding claims, characterized in that the tube or cylinder a \ i £ wraps itself radially inwardly or outwardly to form a multilayer carcass. 009845/1 342 201893Q 7. Apparatus for the manufacture of a pneumatic tire, characterized thereby eichnet that it has means for molding a tube of reinforced elastomeric material that has one of the bead regions of the finished tire has approximately the same circumference that it includes means for expanding the material around the circumference to one To increase value, which is approximately equal to the crown area of the finished tire, and that they mean for attaching a strip of unstretched, elastomeric material in adhesive contact with the outer edge of the tube. - | 8. Apparatus for the manufacture of pneumatic tires, thereby g e k e η nz indicates that they are means of shaping a substantially cylindrical tube of reinforced elastomeric material having a diameter approximately equal to the diameter of the bead regions of the finished tire and that it has conveyor means for passing the tube through or past the following Devices comprising: firstly a device for enlarging the tube diameter to a diameter, which is approximately equal to the diameter of the crown areas of the finished tire, secondly a device for holding the tube in its stretched state ™ and thirdly a device for separating the tube between two adjacent stripes. 009845/1342 Blank page