JP7251337B2 - Sealant tire manufacturing equipment - Google Patents

Description

The present invention relates to a sealant tire manufacturing apparatus and a sealant tire manufacturing method using the same.

In the sealant tire, a sealant material is applied to the inner peripheral surface of the pneumatic tire body. When a through hole is formed in the tread of this tire, the through hole is closed with a sealant material. In this tire, the sealant material suppresses air leakage.

Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2016-78457) discloses a manufacturing apparatus for a sealant tire. In this manufacturing apparatus, a powdery curing agent and liquid rubber are added to a main agent through a nozzle. A sealant material is prepared by kneading this main agent, a curing agent, and a liquid rubber. This sealant material is applied to the inner peripheral surface of the tire body.

In this manufacturing apparatus, the curing agent and the liquid rubber provide a sealant material with an appropriate viscosity. In this manufacturing apparatus, the hardening agent and the liquid rubber are put into the base compound while the outside of the hardening agent is surrounded by the liquid rubber. Scattering of the curing agent is suppressed by surrounding with liquid rubber.

JP 2016-78457 A

In this manufacturing apparatus, liquid rubber is supplied from around the discharge port of the curing agent. A curing agent may adhere to this ejection port. The adhered curing agent narrows the ejection port. Furthermore, it clogs the discharge port. This adhesion of the curing agent causes variations in the amount of the curing agent to be added. The adhesion of this curing agent causes variations in the quality of the sealant material. This variation causes variations in sealant tire quality.

SUMMARY OF THE INVENTION An object of the present invention is to provide a manufacturing apparatus capable of obtaining a sealant tire of stable quality.

A sealant tire manufacturing apparatus according to the present invention includes an extruder for preparing a sealant material to be applied to a tire body, and a nozzle for charging a powder material and a liquid material into the extruder.
The nozzle includes a powder nozzle formed with a discharge port for supplying the powder material to the extruder and a powder material supply path leading to the discharge port, and a tip of the powder nozzle formed with the discharge port. and an outer ring member surrounding the portion. A liquid material supply path is formed between the outer peripheral surface of the tip of the powder nozzle and the inner peripheral surface of the outer ring member. The powder material supply path is coated with a liquid-repellent layer.

Preferably, the outer peripheral surface of the tip of the powder nozzle is coated with a lyophilic layer.

Preferably, the ejection port is recessed from the tip of the outer peripheral surface of the tip of the powder nozzle.

Preferably, a groove is formed between the ejection port and the outer peripheral surface of the tip of the powder nozzle.

Preferably, the outer peripheral surface of the tip portion of the powder nozzle protrudes from the inner peripheral surface of the outer ring member. The outer peripheral surface is slanted inwardly toward the distal end thereof.

A method for manufacturing a sealant tire according to the present invention includes:
(A) a step of introducing the powder material and the liquid material into the main agent in the extruder through a nozzle;
(B) a step of kneading the main agent, the powder material and the liquid material to obtain a sealant material; and (C) a step of applying the sealant material to the tire body.
The nozzle includes a powder nozzle formed with a discharge port for supplying the powder material to the extruder and a powder material supply path leading to the discharge port, and a tip of the powder nozzle formed with the discharge port. and an outer ring member surrounding the portion. A liquid material supply path is formed between the outer peripheral surface of the tip of the powder nozzle and the inner peripheral surface of the outer ring member. The powder material supply path is coated with a liquid-repellent layer.

Preferably, in the step (A), the temperature of the liquid material introduced from the nozzle is 50°C or higher and 120°C or lower.

In the sealant tire manufacturing apparatus according to the present invention, the powder material supply path of the nozzle is coated with the liquid-repellent layer. Adhesion of the liquid material to the powder material supply path is suppressed. Suppressing the adhesion of the liquid material suppresses the adhesion of the powder material. This prevents the powder material supply path from being clogged with the powder material. This manufacturing apparatus can stably supply the powder material. This manufacturing apparatus contributes to the stability of the quality of sealant tires.

FIG. 1 is a conceptual diagram showing a sealant tire manufacturing apparatus according to an embodiment of the present invention. 2 is a cross-sectional view of a nozzle of the manufacturing apparatus of FIG. 1. FIG. 3 is a bottom view of the nozzle of FIG. 2; FIG. FIG. 4 is an explanatory diagram of the liquid repellency and liquid affinity evaluation method of the present invention. FIG. 5 is an explanatory diagram showing the usage state of the nozzles of the manufacturing apparatus of FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

FIG. 1 shows a manufacturing apparatus 2 for a sealant tire. This manufacturing device 2 comprises an extruder 4 , a tire holding device 6 and a material feeding device 8 . The left-right direction in FIG. 1 is the front-rear direction of the manufacturing apparatus 2, and the left-right direction is the direction perpendicular to the paper surface. In this manufacturing apparatus 2, a sealant material is applied to the inner peripheral surface 10a of the pneumatic tire body 10 to obtain a sealant tire.

The extruder 4 includes a cylinder 4a, an extrusion head 4b, a coating nozzle 4c and a plurality of inlets 4d to 4h. Although not shown, the extruder 4 further includes a screw. The screw is rotatably housed in the cylinder 4a.

The extrusion head 4b is attached to the front end of the cylinder 4a. The coating nozzle 4c is attached to the extrusion head 4b. The application nozzle 4c extends from the extrusion head 4b to the tire holding device 6. As shown in FIG. In FIG. 1 , the application nozzle 4 c extends toward the inner peripheral surface 10 a of the tire body 10 .

Each of the plurality of inlets 4d to 4h communicates with the cylinder 4a. Input ports 4 d , 4 e and 4 f are located behind extruder 4 . In other words, the inlets 4d, 4e and 4f are located upstream of the cylinder 4a in the extrusion direction. 4 g of inlets are located in the middle of the cylinder 4a. The inlet 4h is located in front of the cylinder 4a, in other words, downstream.

The tire holding device 6 includes a base 6a, a first moving table 6b, a second moving table 6c, a third moving table 6d, and a holder 6e.

The first moving table 6b is supported by the base 6a. The first moving table 6b is movable in the front-rear direction with respect to the base 6a. Although not shown, the tire holding device 6 includes a first driving device for moving the first moving base 6b in the front-rear direction.

The second moving table 6c is supported by the first moving table 6b. The second moving table 6c is movable in the left-right direction with respect to the first moving table 6b. Although not shown, the tire holding device 6 includes a second driving device for moving the second moving table 6c in the left-right direction.

The third moving table 6d is supported by the second moving table 6c. The third moving table 6d is vertically movable with respect to the second moving table 6c. Although not shown, the tire holding device 6 includes a third driving device for vertically moving the third moving base 6d.

The holder 6e is supported by the third moving table 6d. This holder 6e comprises a plurality of holding rollers 6f. For example, the holder 6e comprises three holding rollers 6f. Each holding roller 6f contacts the tire body 10 to hold the tire body 10. As shown in FIG. The holder 6e can hold the tire body 10 with the axial direction of the tire body 10 being the front-rear direction.

Each holding roller 6f is rotatable around its own axis. As a result, the tire body 10 can rotate while being held by the holder 6e. Although not shown, the holder 6e includes a rotation drive device that rotates the tire body 10. As shown in FIG.

The material supply device 8 includes a plurality of supply units 12 a to 12 h, a plurality of flow meters 14 a to 14 c, and a nozzle 16 . In this material supply device 8, the supply unit 12a is inserted into the input port 4d, the supply units 12b and 12c are inserted into the input port 4e, the supply unit 12d is inserted into the input port 4f, the supply unit 12e is inserted into the input port 4g, and the supply unit 12f is inserted. It is connected to port 4h. The supply portion 12 h and the supply portion 12 g are connected to the nozzle 16 . The nozzle 16 is arranged above the inlet 4h and directed toward the inlet 4h.

In this material supply device 8, the flow meter 14a is connected to the supply section 12d, the flow meter 14b is connected to the supply section 12e, and the flow meter 14c is connected to the supply section 12f. The flow meters 14a-14c are exemplary, and flow meters may be connected to each of all or some of the supplies 12a-12c, 12g and 12h.

As shown in FIG. 2 , the nozzle 16 includes a nozzle body 20 and a middle ring member 22 , an outer ring member 24 , a liquid-repellent layer 26 and a liquid-philic layer 28 , which constitute the powder nozzle 18 .

A nozzle body 20 of the powder nozzle 18 has a discharge port 32 formed on one axial end face 20a. A supply port 34 is formed in the other end face 20b in the axial direction. A powder material supply path 30 is formed through the nozzle body 20 along the axis. The powder material supply path 30 extends from the supply port 34 to the discharge port 32 . The opening cross-sectional area of the powder material supply path 30 gradually decreases from the supply port 34 toward the discharge port 32 . Further, at the tip of the nozzle body 20, the outer diameter of the nozzle body 20 gradually decreases toward the tip.

An insertion hole 36 is formed through the middle ring member 22 from one end face 22a in the axial direction to the other end face 22b. The outer diameter of the front end portion 22c of the intermediate ring member 22 is smaller than the outer diameter of the rear end portion 22d on the side of the end face 22b. The outer diameter of the insertion hole 36 gradually increases toward the end face 22a at the tip portion 22c.

The nozzle body 20 is inserted into the insertion hole 36 of the middle ring member 22 . The nozzle main body 20 and the central ring member 22 constitute the powder nozzle 18 . A groove 38 is formed between the nozzle body 20 and the insertion hole 36 on the tip side of the powder nozzle 18 . As shown in FIG. 2, the end face 20a of the nozzle body 20 is recessed rearward from the end face 22a of the intermediate ring member 22. As shown in FIG.

The outer ring member 24 is formed with an insertion hole 40 penetrating from one end face 24a in the axial direction to the other end face 24b. A plurality of communication holes 42 are formed in the outer ring member 24 . Each communication hole 42 penetrates from the outer peripheral surface 24 c of the outer ring member 24 to the insertion hole 40 .

An outer ring member 24 is attached to the powder nozzle 18 . A distal end portion 22 c of the middle ring member 22 is inserted into the insertion hole 40 of the outer ring member 24 . A liquid material supply path 44 is formed between the outer peripheral surface 22e of the tip portion 22c and the inner peripheral surface 40a of the insertion hole 40 . A tip portion 22 c of the middle ring member 22 protrudes from an end surface 24 a of the outer ring member 24 .

The powder material supply path 30 is coated with a liquid-repellent layer 26 that is difficult to wet with the liquid material M1. This liquid-repellent layer 26 is exemplified by silicon-based coating. The outer peripheral surface 22e of the tip portion 22c of the middle ring member 22 is coated with a lyophilic layer 28 that is easily wetted with the liquid material M1. This lyophilic layer 28 is exemplified by Si2-based coating, for example.

FIG. 3 shows the bottom surface of nozzle 16 looking in the direction of arrow III in FIG. As shown in FIG. 3, the discharge port 32 is surrounded by a liquid material supply path 44. As shown in FIG. The outlet 32 is surrounded by a peripheral opening 46 of the liquid material supply channel 44 .

Here, a method for evaluating the liquid repellency of the liquid repellent layer 26 and the lyophilic property of the lyophilic layer 28 will be described with reference to FIG. In this evaluation method, the contact angle θ of the liquid material M1 is measured on the surface 48 of the coating layer to be evaluated. This contact angle θ is obtained by dropping the liquid material M1 in the form of small particles using a glass capillary or the like on the surface 48 of the coating layer to be evaluated, which is held horizontally. It means the angle to make. A larger contact angle θ indicates a higher liquid repellency, and a smaller contact angle θ indicates a higher lyophilic property. This contact angle θ can be measured using a contact angle measuring device.

FIG. 5 shows how the liquid material M1 and the powder material M2 are introduced from the nozzle 16. As shown in FIG. The powder material M2 is discharged from the discharge port 32 of the nozzle 16. As shown in FIG. A liquid material M1 is discharged from the peripheral opening 46 . The ejected liquid material M1 surrounds the ejected powder material M2. A mixed material of the liquid material M1 and the powder material M2 is fed into the extruder 4 .

Here, a method of manufacturing a sealant tire using this manufacturing apparatus 2 will be described. The sealant material to be used is not particularly limited as long as it has adhesive properties, and ordinary rubber compositions used for sealing punctures in pneumatic tires can be used. Here, as the sealant material, a rubber component containing a rubber composition as a main component, a liquid polymer as the liquid material M1, and a curing agent as the powder material M2 are used for explanation.

As this rubber component, for example, butyl rubber is used. Examples of butyl-based rubber include butyl rubber (IIR) and halogenated butyl rubber (X-IIR) such as brominated butyl rubber (Br-IIR) and chlorinated butyl rubber (Cl-IIR). The rubber component may further include other components such as natural rubber (NR).

Liquid polymers include liquid polybutene, liquid polyisobutene, liquid polyisoprene, liquid polybutadiene, liquid poly-α-olefin, liquid isobutylene, liquid ethylene α-olefin copolymer, liquid ethylene-propylene copolymer, liquid ethylene-butylene copolymer, and the like. mentioned. Liquid polybutene is used here from the viewpoint of imparting tackiness and the like.

The curing agent is not particularly limited, and conventionally known compounds can be used, but the curing agent is preferably an organic peroxide. Examples of organic peroxides include acyl peroxides such as dibenzoyl peroxide, benzoyl peroxide and p-chlorobenzoyl peroxide, 1-butyl peroxyacetate, t-butyl peroxybenzoate and t-butyl peroxyphthalate. Peroxyesters such as, ketone peroxides such as methyl ethyl ketone peroxide, di-t-butyl peroxybenzoate, alkyl peroxides such as 1,3-bis(1-butylperoxyisopropyl)benzene, t-butyl Examples include hydroperoxides such as hydroperoxide, dicumyl peroxide, t-butylcumyl peroxide and the like. Here, dibenzoyl peroxide is used as the curing agent.

Further, the sealant material contains a cross-linking aid. Examples of cross-linking aids include sulfenamide, thiazole, thiuram, thiourea, guanidine, dithiocarbamine, aldehyde-amine, aldehyde-ammonia, imidazoline, xanthate, and quinonedioxime compounds. At least one selected from the group consisting of (quinoid compounds) can be used.

In this sealant tire manufacturing method, the tire body 10 is held by the tire holding device 6 (STEP 1). In STEP 1, the tire body 10 is held at a predetermined position and rotated about its axis.

In the extruder 4, the sealant material is kneaded to obtain the sealant material (STEP 2). In STEP 2, the extruder 4 is charged with a rubber component such as butyl rubber, an inorganic filler, and a cross-linking aid from inlets 4d, 4e, and 4f on the upstream side. These are kneaded and sent to the downstream side. A liquid polymer is introduced through an intermediate inlet 4g. The material and the liquid polymer, which are fed from the inlets 4d, 4e, and 4f on the upstream side, are kneaded and further sent to the downstream side. By this kneading, the main agent of the sealant material is obtained.

A liquid polymer and a curing agent are introduced from the inlet 4h on the downstream side. Here, the plasticizer is further introduced from this inlet 4h. The liquid polymer and curing agent are dispensed using a nozzle 16, as shown in FIG. A sealant material is obtained by kneading a liquid polymer and a curing agent with a main agent of the sealant material. This sealant material is extruded from the extrusion head 4b. The extruded sealant material is sent toward the inner peripheral surface 10a of the tire body 10 by the application nozzle 4c.

A sealant material is applied to the inner peripheral surface 10a of the tire body 10 (STEP 3). The sealant material delivered from the application nozzle 4 c is applied to the inner peripheral surface 10 a of the tire body 10 . The tire holding device 6 moves in the axial direction while rotating the tire body 10 . As a result, the sealant material is applied to the inner peripheral surface 10a with a predetermined width in the axial direction. A sealant tire is thus obtained.

In the nozzle 16 of the manufacturing apparatus 2, the powder material M2 to be discharged is covered with the liquid material M1. This suppresses scattering of the powder material M2. The powder material M2 is fed into the extruder 4 together with the liquid material M1 without scattering.

In this nozzle 16 , the powder material supply path 30 is coated with the liquid-repellent layer 26 . This makes it difficult for the liquid material M1 to adhere to the powder material supply path 30 . Since the liquid material M1 is difficult to adhere, the adhesion of the powder material M2 together with the liquid material M1 is suppressed. Adhesion of the powder material M2 to the powder material supply path 30 is suppressed. The powder material supply path 30 is prevented from having its flow path cross-sectional area reduced due to adhesion of the powder material M2. The powder material supply path 30 is prevented from being clogged due to adhesion of the powder material M2. This nozzle 16 can stably supply the powder material M2.

From the viewpoint of suppressing adhesion of the liquid material M1, the contact angle θ of the liquid-repellent layer 26 is preferably 90° or more, more preferably 100° or more. Although the upper limit of the contact angle θ is not particularly limited, it is, for example, 120° or less.

In this nozzle 16 , the outer peripheral surface 22 e of the powder nozzle 18 forming the liquid material supply path 44 is coated with the lyophilic layer 28 . The liquid material M1 easily adheres to the outer peripheral surface 22e. The liquid material M1 easily flows along the outer peripheral surface 22e. The nozzle 16 suppresses scattering of the liquid material M1.

The contact angle θ of the lyophilic layer 28 is preferably 30° or less, more preferably 15° or less, from the standpoint of easy adhesion of the liquid material M1. Although the lower limit of the contact angle θ is not particularly limited, it is, for example, 5° or more.

In this nozzle 16 , the end face 20 a of the nozzle body 20 is located inside the end face 22 a of the middle ring member 22 . Therefore, the ejection port 32 is recessed from the tip of the outer peripheral surface 22 e of the powder nozzle 18 . The liquid material M1 guided by the outer peripheral surface 22e is suppressed from flying toward the ejection port 32. As shown in FIG. This prevents the liquid material M1 from adhering to the ejection port 32 . A liquid-repellent layer 26 may be formed on both or either of the end face 20a and the end face 22a. This further suppresses the liquid material M1 from adhering to the ejection port 32 .

In this nozzle 16, a groove 38 is formed between the ejection port 32 and the outer peripheral surface 22e. The groove 38 is recessed upward between the outlet 32 and the outer peripheral surface 22e. The liquid material M1 guided by the outer peripheral surface 22e is suppressed from flowing toward the ejection port 32. As shown in FIG. This prevents the liquid material M1 from adhering to the ejection port 32 . Furthermore, the liquid-repellent layer 26 may be formed on the outer peripheral surface of the nozzle body 20 and the inner peripheral surface of the insertion hole 36 of the middle ring member 22 that form the groove 38 . This further suppresses the liquid material M1 from adhering to the ejection port 32 .

In this nozzle 16 , the outer peripheral surface 22 e protrudes from the inner peripheral surface 40 a of the insertion hole 40 of the outer ring member 24 . The outer peripheral surface 22e easily guides the liquid material M1. Further, the outer peripheral surface 22e is slanted inward toward the tip thereof. The outer peripheral surface 22 e easily guides the liquid material M<b>1 toward the periphery of the powder material M<b>2 discharged from the discharge port 32 . Furthermore, a liquid-repellent layer 26 may be formed on the inner peripheral surface 40 a of the insertion hole 40 . This makes it easier for the outer peripheral surface 22e to guide the liquid material M1.

In this sealant tire manufacturing method, the liquid material M1 discharged from the nozzle 16 is preferably heated to an appropriate temperature. The moderate temperature liquid material M1 facilitates kneading in the extruder 4 . From the viewpoint of facilitating this kneading, the temperature of the liquid material M1 is preferably 50° C. or higher. From the same point of view, this temperature is preferably 120° C. or less. This temperature is measured at the outlet 32 of nozzle 16 . From the viewpoint of suppressing the temperature change of the liquid material M1, it is preferable that the powder material M2 is also heated to the same temperature. This temperature is measured with the powder material M2 immediately after being ejected from the nozzle 16. FIG.

This nozzle 16 is formed from a nozzle body 20 , a middle ring member 22 and an outer ring member 24 . A liquid-repellent layer 26 is coated on the powder material supply path 30 of the nozzle body 20 . A lyophilic layer 28 is coated on the outer peripheral surface 22 e of the middle ring member 22 . Separating the nozzle main body 20 and the middle ring member 22 facilitates separate coating of the liquid-repellent layer 26 and the liquid-philic layer 28 . Furthermore, by separating the middle ring member 22 and the outer ring member 24, the lyophilic layer 28 can be easily coated on the outer peripheral surface 22e.

Although this nozzle 16 is assembled from the nozzle main body 20, the middle ring member 22, and the outer ring member 24, it is not limited to this. Any two or all of the nozzle body 20, the middle ring member 22, and the outer ring member 24 may be integrally formed.

The manufacturing apparatus described above and the manufacturing method using this manufacturing apparatus can be widely applied to the manufacture of sealant tires.

DESCRIPTION OF SYMBOLS 2... Manufacturing apparatus 4... Extruder 10... Tire main body 10a... Inner peripheral surface 16... Nozzle 18... Powder nozzle 20... Nozzle main body 22... Middle ring member 22e ... Outer peripheral surface 24 ... Outer ring member 26 ... Liquid-repellent layer 28 ... Lyophilic layer 30 ... Powder supply path 32 ... Discharge port 38 ... Groove 40 ... Insertion Hole 40a... Inner peripheral surface 44... Liquid material supply path 46... Surrounding opening

Claims (7)

An extruder for preparing a sealant material to be applied to the tire body, and a nozzle for introducing a powder material and a liquid material into the extruder,
The nozzle includes a powder nozzle having a discharge port for supplying the powder material to the extruder and a powder material supply path leading to the discharge port, and the discharge port of the powder nozzle. an outer ring member surrounding the tip,
A liquid material supply path is formed between an outer peripheral surface of the tip portion of the powder nozzle and an inner peripheral surface of the outer ring member,
An apparatus for manufacturing a sealant tire, wherein the powder material supply path is coated with a liquid-repellent layer. 2. The sealant tire manufacturing apparatus according to claim 1, wherein the outer peripheral surface of the tip portion of the powder nozzle is coated with a lyophilic layer. 3. The sealant tire manufacturing apparatus according to claim 1, wherein the discharge port is recessed from the tip of the outer peripheral surface of the tip of the powder nozzle. The sealant tire manufacturing apparatus according to any one of claims 1 to 3, wherein a groove is formed between the discharge port and the outer peripheral surface of the tip portion of the powder nozzle. The outer peripheral surface of the tip of the powder nozzle protrudes from the inner peripheral surface of the outer ring member, and the outer peripheral surface is inclined inwardly and outwardly toward the tip. 5. The sealant tire manufacturing apparatus according to any one of 4. (A) a step of introducing the powder material and the liquid material into the main agent in the extruder through a nozzle;
(B) a step of kneading the main agent, the powder material and the liquid material to obtain a sealant material; and (C) a step of applying the sealant material to a tire body,
The nozzle comprises a powder nozzle formed with a discharge port for supplying the powder material to the extruder and a powder material supply path leading to the discharge port, and a tip end of the powder nozzle formed with the discharge port. a liquid material supply path is formed between an outer peripheral surface of the tip portion of the powder nozzle and an inner peripheral surface of the outer ring member, and the powder material A method for producing a sealant tire, wherein the supply channel is coated with a liquid-repellent layer. The method for manufacturing a sealant tire according to claim 6, wherein in the step (A), the temperature of the liquid material injected from the nozzle is 50°C or higher and 120°C or lower.

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