JP5168818B2 - Method for forming tire constituent member - Google Patents

Description

  The present invention relates to a method of molding a component member of a pneumatic tire, and more specifically, a tire that can reduce equipment costs when molding a cylindrical tire component member having different dimensions for each tire size. The present invention relates to a method for forming a constituent member.

  2. Description of the Related Art Conventionally, a molding drum that can be expanded and contracted has been used as a molding apparatus for molding a cylindrical tire constituent member. This forming drum is configured to change the outer diameter by advancing and retracting a plurality of arc-shaped plates arranged in an annular shape in the drum radial direction, and the tire configuration on the outer peripheral surface with the outer diameter expanded. A tire component is removed in a state where the member is molded and the outer diameter thereof is reduced (see, for example, Patent Document 1).

  However, since the cylindrical tire constituent member has different dimensions for each tire size, when forming the tire constituent member using an expandable / contractible forming drum, it is necessary to change the forming drum for each tire size, There is a problem that the equipment cost becomes high.

In addition, when a bead ring is pressure-bonded to a cylindrical member integrated with, for example, an inner liner layer, a tie rubber layer, a carcass layer, and a side rubber layer on the molding drum, the surface pressure during the pressure bonding is not sufficiently high. The crimping may be insufficient.
JP 2001-219478 A

  An object of the present invention is to provide a method for forming a tire constituent member that can reduce equipment costs when forming a cylindrical tire constituent member having different dimensions for each tire size.

  It is a further object of the present invention to provide a method for forming a tire constituent member that enables the members to be reliably integrated by increasing the surface pressure during pressure bonding.

In order to achieve the above object, a method for molding a tire component member according to the present invention is characterized in that a first member having a cylindrical shape is wound around at least three pressure-bonding rolls having rotational axes arranged parallel to each other. A second member having a ring shape is arranged on the outer peripheral side, and the first member is pressed against the second member by expanding the mutual spacing of the crimping rolls, while the first member is pressed on the outer peripheral side of the first member. An auxiliary roll is disposed so as to abut against one member or the second member, and the first member and the second member are integrally rotated in this state, whereby the first member and the second member are mutually connected. A method of forming a tire component to be crimped to ,
The first member includes an inner liner layer, and the second member is a bead ring .

  According to the present invention, it is possible to form a plurality of types of cylindrical tire constituent members having different dimensions with the same molding apparatus by arbitrarily adjusting the mutual interval between the pressure rollers. Therefore, when molding cylindrical tire constituent members having different dimensions for each tire size, a molding apparatus can be used in common, and the equipment cost can be reduced. In addition, unlike the conventional expandable / contractible forming drum, since a plurality of crimping rolls are used as the support for the first member, the surface pressure at the time of crimping can be increased and the members can be reliably integrated. .

In the present invention, as the means for integrally rotating the first member and the second member, a driving force can be applied to the first member. More specifically, the first member by sandwiching the first member, and drives the auxiliary roll between the auxiliary rolls positioned on the outer peripheral side of at least one press roll and the first member of the crimping rolls What is necessary is just to give a driving force.

  In addition, as a means for integrally rotating the first member and the second member, a driving force can be applied to the second member. More specifically, an auxiliary roll may be disposed so as to contact the second member, and the auxiliary member may be driven to apply a driving force to the second member.

  Further, as the means for integrally rotating the first member and the second member, it is possible to simultaneously apply a driving force to the first member and the second member. More specifically, by sandwiching the first member and the second member between at least one of the crimping rolls and the auxiliary roll located on the outer peripheral side of the second member, the auxiliary roll is driven. What is necessary is just to give a driving force to a 1st member and a 2nd member simultaneously.

  The first member preferably includes at least one film layer made of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer with a thermoplastic resin. When the first member includes a film layer, it is possible to prevent uneven deformation from occurring when the first member is deformed due to expansion of the mutual interval between the pressure rollers. In particular, when the film layer is disposed in the innermost layer of the first member, it is possible to prevent the first member from sticking to the pressure roller.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view schematically showing an example of a molding apparatus for carrying out the method for molding a tire constituent member of the present invention. As shown in FIG. 1, this forming apparatus includes at least three pressure-bonding rolls 1 whose rotation axes are arranged in parallel to each other, and these pressure-bonding rolls 1 are configured so that their relative positions are arbitrarily adjusted. ing. The first member 11 having a cylindrical shape is wound so as to straddle all the pressure-bonding rolls 1. On the other hand, the second member 12 a having a ring shape or the second member 12 b having a cylindrical shape is disposed on the outer peripheral side of the first member 11.

  At least three pressure rollers 1 are required, but preferably 4 to 16, more preferably 8 to 16. As the number of the pressure rollers 1 increases, the uniformity of the obtained tire constituent members increases. However, when the number is too large, the apparatus becomes complicated. These pressure rollers 1 are preferably arranged at equal intervals on the circumference. 2 shows an arrangement when there are four pressure rollers, FIG. 3 shows an arrangement when there are eight pressure rollers, and FIG. 4 shows an arrangement when there are 16 pressure rollers. As the pressure roller 1, it is preferable to use a cylindrical one having a constant outer diameter, but for example, a drum-shaped one that swells in the center in the longitudinal direction may be used.

  The length of the pressure roller 1 is not particularly limited, but is preferably longer than the width of the cylindrical member used for molding. For example, the length of the pressure roller 1 can be set to be twice or more the width of the cylindrical member, and a plurality of cylindrical members can be aligned and integrally formed in the longitudinal direction of the pressure roller 1. In this case, it is possible to cope with the formation of a wide large tire.

  As the first member 11 having a cylindrical shape, for example, an inner liner layer, a tie rubber layer, finishing, a side rubber layer (including a rim cushion) and a carcass layer are laminated and integrated, an inner liner layer, a tie rubber layer, a finishing, for example. (Reinforcing layer), side rubber layer laminated and integrated, inner liner layer, tie rubber layer, finishing laminated and integrated, or inner liner layer alone, etc. It is not limited.

  The inner liner layer is disposed in the innermost layer of the first member 11, and the inner liner layer may be a film layer made of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer with a thermoplastic resin. When the first member 11 includes the film layer, it is possible to prevent uneven deformation from occurring when the first member 11 is deformed due to the expansion of the interval between the pressure rollers 1. In addition, when the film layer is disposed in the innermost layer of the first member 11, the close contact of the first member 11 with the pressure roller 1 can also be prevented. The film layer may be laminated separately from the inner liner layer. In that case, you may exclude a film layer partially from the part which overlaps with the bead ring in the 1st member 11. FIG.

  On the other hand, a bead ring can be mentioned as the 2nd member 12a which has a ring shape. Examples of the second member 12b having a cylindrical shape include a carcass layer and a tie rubber layer. That is, the first member 11 and the second members 12a and 12b are constituent members of the primary green tire.

  5 (a) to 5 (c) are side views showing respective steps of the method for molding a tire constituent member of the present invention. When the tire constituent member is molded using the molding apparatus, first, as shown in FIG. 5A, all the pressure rollers 1 are arranged at the radially inner position of the first member 11 having a cylindrical shape. Then, the first member 11 is wound around the pressure roller 1, and the second member 12 a having a ring shape (or the second member 12 b having a cylindrical shape) is further disposed on the outer peripheral side of the first member 11. Next, as shown in FIG. 5 (b), the first member 11 is pressed against the second member 12 a by moving the crimping roll 1 to a radially outer position of the first member 11 and expanding the mutual interval. Then, as shown in FIG. 5C, the first member 11 and the second member 12a are integrally rotated while the first member 11 is pressed against the second member 12a. The member 11 and the second member 12a are pressure-bonded to each other. When the number of the pressure-bonding rollers 1 is N, the first member 11 and the second member 12a are rotated by 1 / N circumference so that both are pressed. Of course, you may rotate the 1st member 11 and the 2nd member 12a more than 1 / N circumference as needed.

  According to the method for molding a tire constituent member described above, it is possible to form a plurality of types of cylindrical tire constituent members having different dimensions with the same molding apparatus by arbitrarily adjusting the mutual interval between the pressure rollers 1. . Therefore, when molding cylindrical tire constituent members having different dimensions for each tire size, a molding apparatus can be used in common, and the equipment cost can be reduced. In addition, the shaping | molding apparatus using the several crimping | compression-bonding roll 1 can be made into a simple structure compared with the conventional moldable drum. In addition, unlike the conventional expandable / contractible forming drum, since a plurality of pressure-bonding rolls 1 are used as a support for the first member 11, the surface pressure at the time of pressure-bonding is increased and the members are reliably integrated. Can do. Thereby, peeling of the member in a formation process and the air accumulation between members can be prevented more reliably.

  Next, a means for integrally rotating the first member and the second member will be described. 6, FIG. 7 (a), (b), FIG. 8 (a), (b), FIG. 9 (a), (b), respectively, is a molding apparatus for carrying out the method for molding a tire component according to the present invention. The various forms of are shown.

  In FIG. 6, as a means for integrally rotating the first member 11 and the second member 12a, driving force is applied to the first member 11 by driving at least one of the pressure-bonding rolls 1a. ing.

  7 (a) and 7 (b), at least one of the crimping rolls 1a and the outer periphery of the first member 11 as means for integrally rotating the first member 11 and the second member 12a. The first member 11 is sandwiched between the auxiliary roll 2 positioned on the side and the auxiliary roll 2 is driven to apply a driving force to the first member 11.

  8A and 8B, the auxiliary roll 3 is disposed so as to contact the second member 12a as a means for integrally rotating the first member 11 and the second member 12a. Driving force 3 is applied to the second member 12a.

  9 (a) and 9 (b), as the means for integrally rotating the first member 11 and the second member 12a, the outer periphery of at least one of the pressure-bonding rolls 1a and the second member 12a. The first member 11 and the second member 12a are sandwiched between the auxiliary roll 4 located on the side, and the auxiliary roll 4 is driven to simultaneously apply a driving force to the first member 11 and the second member 12a.

  In the tire component forming method described above, since the first member 11 is pressed against the second member 12a by the plurality of pressure-bonding rolls 1, it is driven to at least one of the first member 11 and the second member 12a. By applying force, the two can be rotated together and the crimping operation can be performed.

  Below, the film layer used by this invention is demonstrated. This film layer can be composed of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin.

  Examples of the thermoplastic resin used in the present invention include polyamide resins [for example, nylon 6 (N6), nylon 66 (N66), nylon 46 (N46), nylon 11 (N11), nylon 12 (N12), nylon 610 (N610), nylon 612 (N612), nylon 6/66 copolymer (N6 / 66), nylon 6/66/610 copolymer (N6 / 66/610), nylon MXD6, nylon 6T, nylon 6 / 6T copolymer, nylon 66 / PP copolymer, nylon 66 / PPS copolymer], polyester resin [for example, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), polybutylene terephthalate / Tetramethylene glycol copolymer, PET PEI copolymer, polyarylate (PAR), polybutylene naphthalate (PBN), liquid crystal polyester, aromatic polyester such as polyoxyalkylene diimide diacid / polybutylene terephthalate copolymer], polynitrile resin [for example, polyacrylonitrile ( PAN), polymethacrylonitrile, acrylonitrile / styrene copolymer (AS), methacrylonitrile / styrene copolymer, methacrylonitrile / styrene / butadiene copolymer], poly (meth) acrylate resin [eg polymethacryl Acid methyl (PMMA), polyethyl methacrylate, ethylene ethyl acrylate copolymer (EEA), ethylene acrylic acid copolymer (EAA), ethylene methyl acrylate resin (EMA)], polyvinyl resin [for example, vinyl acetate (EVA), polyvinyl alcohol (PVA), vinyl alcohol / ethylene copolymer (EVOH), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC), vinyl chloride / vinylidene chloride copolymer, vinylidene chloride / methyl acrylate Copolymer], cellulose resin [eg, cellulose acetate, cellulose acetate butyrate], fluorine resin [eg, polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polychlorofluoroethylene (PCTFE), tetrafluoroethylene / ethylene Copolymer (ETFE)], imide resin [for example, aromatic polyimide (PI)] and the like.

  Examples of the elastomer used in the present invention include diene rubbers and hydrogenated products thereof [for example, NR, IR, epoxidized natural rubber, SBR, BR (high cis BR and low cis BR), NBR, hydrogenated NBR, Hydrogenated SBR], olefin rubber [eg ethylene propylene rubber (EPDM, EPM), maleic acid modified ethylene propylene rubber (M-EPM)], butyl rubber (IIR), isobutylene and aromatic vinyl or diene monomer copolymer, Acrylic rubber (ACM), ionomer, halogen-containing rubber [for example, Br-IIR, Cl-IIR, brominated product of isobutylene paramethylstyrene copolymer (Br-IPMS), chloroprene rubber (CR), hydrin rubber (CHC, CHR), Chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), maleic acid-modified chlorinated polyethylene (M-CM)], silicone rubber (eg, methyl vinyl silicone rubber, dimethyl silicone rubber, methyl phenyl vinyl silicone rubber), sulfur-containing rubber (eg, polysulfide rubber), fluoro rubber (eg, Vinylidene fluoride rubber, fluorine-containing vinyl ether rubber, tetrafluoroethylene-propylene rubber, fluorine-containing silicone rubber, fluorine-containing phosphazene rubber), thermoplastic elastomer (eg, styrene elastomer, olefin elastomer, polyester elastomer, And urethane elastomers and polyamide elastomers).

  In the thermoplastic elastomer composition used in the present invention, the composition ratio of the thermoplastic resin component (A) and the elastomer component (B) may be appropriately determined depending on the balance of film thickness and flexibility, but the preferred range is The ratio is 10/90 to 90/10, more preferably 20/80 to 85/15 (weight ratio).

  In the thermoplastic elastomer composition according to the present invention, in addition to the essential components (A) and (B), as a third component, other polymers such as a compatibilizer and a compounding agent can be mixed. The purpose of mixing other polymers is to improve the compatibility between the thermoplastic resin component and the elastomer component, to improve the film molding processability of the material, to improve heat resistance, to reduce costs, etc. Examples of the material used for this include polyethylene, polypropylene, polystyrene, ABS, SBS, and polycarbonate.

The thermoplastic elastomer composition is prepared by melt-kneading a thermoplastic resin and an elastomer (unvulcanized material in the case of rubber) in advance using a twin-screw kneading extruder or the like, and adding an elastomer component in the thermoplastic resin forming a continuous phase. It is obtained by dispersing. When the elastomer component is vulcanized, a vulcanizing agent may be added under kneading to dynamically vulcanize the elastomer. Further, various compounding agents (excluding the vulcanizing agent) to the thermoplastic resin or the elastomer component may be added during the kneading, but are preferably mixed in advance before kneading. The kneading machine used for kneading the thermoplastic resin and the elastomer is not particularly limited, and examples thereof include a screw extruder, a kneader, a Banbury mixer, and a biaxial kneading extruder. Among these, it is preferable to use a twin-screw kneading extruder for kneading the resin component and the rubber component and for dynamic vulcanization of the rubber component. Further, two or more types of kneaders may be used and kneaded sequentially. As conditions for melt-kneading, the temperature may be higher than the temperature at which the thermoplastic resin melts. The shear rate during kneading is preferably 2500 to 7500 sec ⁻¹ . The entire kneading time is from 30 seconds to 10 minutes, and when a vulcanizing agent is added, the vulcanization time after addition is preferably from 15 seconds to 5 minutes. The thermoplastic elastomer composition produced by the above method is formed into a film by molding with a resin extruder or calender molding. The method for forming a film may be a method of forming a film of a normal thermoplastic resin or thermoplastic elastomer.

  The thin film of the thermoplastic elastomer composition thus obtained has a structure in which the elastomer is dispersed as a discontinuous phase in a thermoplastic resin matrix. By adopting the dispersion structure in such a state, it is possible to set the Young's modulus in a range of 1 to 500 MPa and to impart appropriate rigidity as a tire constituent member.

  The thermoplastic resin or thermoplastic elastomer composition can be molded into a sheet or film and embedded alone in the tire, but an adhesive layer may be laminated to improve the adhesion to the adjacent rubber. good. Specific examples of the adhesive polymer constituting the adhesive layer include ultrahigh molecular weight polyethylene (UHMWPE), ethylene ethyl acrylate copolymer (EEA), ethylene methyl acrylate resin (EMA) having a molecular weight of 1 million or more, preferably 3 million or more. ), Acrylate copolymers such as ethylene acrylic acid copolymer (EAA) and their maleic anhydride adducts, polypropylene (PP) and its maleic acid modification, ethylene propylene copolymer and its maleic acid modification, Polybutadiene resin and its modified maleic anhydride, styrene-butadiene-styrene copolymer (SBS), styrene-ethylene-butadiene-styrene copolymer (SEBS), fluorine thermoplastic resin, polyester thermoplastic resin, etc. Can be mentioned. These can be extruded into a sheet form or a film form by a conventional method, for example, using a resin extruder. The thickness of the adhesive layer is not particularly limited, but it is preferable that the thickness is small for weight reduction of the tire, and 5 μm to 150 μm is preferable.

1 is a perspective view schematically showing an example of a molding apparatus for carrying out a method for molding a tire constituent member of the present invention. It is a side view which shows the shaping | molding apparatus (in the case of four press rollers) used by this invention. It is a side view which shows the shaping | molding apparatus (when a press roller is eight) used by this invention. It is a side view which shows the shaping | molding apparatus (in the case of 16 press rollers) used by this invention. The shaping | molding method of the tire structural member of this invention is shown, (a)-(c) is a side view of each process. It is a side view which shows the modification of the shaping | molding apparatus for enforcing the shaping | molding method of the tire structural member of this invention. The modification of the shaping | molding apparatus for enforcing the shaping | molding method of the tire structural member of this invention is shown, (a) is a front view, (b) is a side view. The modification of the shaping | molding apparatus for enforcing the shaping | molding method of the tire structural member of this invention is shown, (a) is a front view, (b) is a side view. The modification of the shaping | molding apparatus for enforcing the shaping | molding method of the tire structural member of this invention is shown, (a) is a front view, (b) is a side view.

Explanation of symbols

1 pressure roll 2,3,4 auxiliary roll 11 first member (cylindrical shape)
12a Second member (ring shape)
12b Second member (cylindrical shape)

Claims (9)

A first member having a cylindrical shape is wound around at least three pressure-bonding rolls having rotational axes arranged in parallel with each other, a second member having a ring shape is disposed on the outer peripheral side of the first member, and While pressing the first member against the second member by expanding the mutual interval, an auxiliary roll is disposed on the outer peripheral side of the first member so as to contact the first member or the second member, In this state, by rotating the first member and the second member integrally, a molding method of a tire constituent member that press-bonds the first member and the second member to each other ,
The method for forming a tire constituent member, wherein the first member includes an inner liner layer, and the second member is a bead ring .   The method for forming a tire constituent member according to claim 1, wherein a driving force is applied to the first member as means for rotating the first member and the second member integrally.   The first member is sandwiched between at least one of the crimping rolls and an auxiliary roll located on the outer peripheral side of the first member, and the auxiliary member is driven to drive the first member. The method for forming a tire constituent member according to claim 2, wherein:   The method for forming a tire constituent member according to claim 1, wherein a driving force is applied to the second member as means for rotating the first member and the second member integrally. The method for forming a tire constituent member according to claim 4 , wherein an auxiliary roll is disposed so as to abut on the second member, and the driving force is applied to the second member by driving the auxiliary roll.   2. The molding of a tire constituent member according to claim 1, wherein a driving force is simultaneously applied to the first member and the second member as means for integrally rotating the first member and the second member. Method. The first member and the second member are sandwiched between at least one of the crimping rolls and an auxiliary roll positioned on the outer peripheral side of the second member, and the first roll is driven by driving the auxiliary roll. The method for forming a tire constituent member according to claim 6 , wherein a driving force is simultaneously applied to the one member and the second member. The tire structure according to any one of claims 1 to 7 , wherein the first member includes at least one film layer made of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer with a thermoplastic resin. A method for forming a member. The method for forming a tire constituent member according to claim 8 , wherein the film layer is disposed in an innermost layer of the first member.

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