KR101961557B1 - Method of manufacturing tyre having improved filling-in property and tyre thereof - Google Patents

Abstract

The present invention discloses a method for manufacturing a tire of a sealant layer excellent in the formability and a tire therefor.
A method of manufacturing a tire of a sealant layer having excellent fineness according to the present invention and a tire therefor include the steps of (S1) rotating an electrically grounded tire, and a step (S1) of moving the fine nozzles having a voltage difference from the grounded tire to the inner surface (S2) of depositing a fine fiber layer on the inner surface of the fine fiber layer by electric field with fine fibers and discharging the fiber stock solution, and forming a sealant layer on top of the fine fiber layer to form a sealant layer The sealant layer is maintained by lowering the flowability in a high temperature environment, while the sealant layer is forcedly flowed when the foreign substance is removed at a low temperature, I can part effectively.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing a tire having a sealant layer excellent in plug-

The present invention relates to a method for manufacturing a sealant layer having excellent properties and, more particularly, to a sealant layer having excellent flowability, And a sealant layer of excellent tackiness (sealability) which can effectively fill a punctured portion of a tire by forcibly flowing a sealant layer when removing foreign matter at a low temperature, and a tire thereby.

Conventional tires have a sealant layer applied to the inner liner layer of the tire. Punctures may be generated due to sharp nails or foreign substances on the road surface when the vehicle is running. In this case, So that the part is blocked.

That is, as disclosed in Korean Patent Publication No. 1434664, the tire includes a tread portion 1, a side wall portion 2, and a bead portion 3, A carcass layer 4 turning up a bead portion 3 provided at the center of the carcass layer 4 on the tread portion 1 is arranged on the carcass layer 4, The inner liner 7 is disposed inside the carcass layer 4 and the sealant layer 8 is disposed inside the position corresponding to the tread portion 1 of the inner liner 7 The sealant layer 8 seals to penetrate into the puncture portion to prevent the leakage of the internal air. However, since the sealant of the sealant layer is often repeatedly generated during the running of the vehicle, And the fluidity is increased, so that the sealant is released into the puncture portion It has been a problem, especially during the cold winter months and is often caused by the low-temperature environment where the sealing function, the viscosity of the sealant layer up flowability away.

On the other hand, Japanese Patent Publication No. 3774707 discloses a self-sealing tire using nylon knitted fabric. However, since such nylon fiber knitted fabric has a limited movement of fibers in a state of being woven, it is formed in various forms during tire puncturing There is still a problem that the air inside the tire is leaked finely due to a limit in filling the puncture portion with water.

To solve this problem, there is disclosed a technique for securing fluidity by immersing a fabric or a knitted fabric in a silicate itself, but it is difficult to uniformly disperse the fabric in a silane.

Accordingly, the technical problem to be solved by the present invention is to improve the flowability of the sealant changed by the external heat so as to maintain the sealant layer by lowering the flowability in a high temperature environment, and to force the sealant layer to flow when the foreign substance is removed at low temperature, A method for manufacturing a tire of a sealant layer excellent in fineness (rod-shaped) capable of effectively covering a part of a tire, and a tire thereby.

In order to solve the above-mentioned technical problem, the present invention provides a method of manufacturing a tire, comprising the steps of: (S1) rotating an electrically grounded tire; aligning a fine nozzle having a voltage difference from the grounded tire to the inner surface of the tire, (S2) of laminating a fine fiber layer on the inner surface by an electric field with fine fibers, and (S3) forming a sealant layer by topping the sealant liquid on top of the fine fiber layer. A method of manufacturing a tire of a sealant layer.

According to an embodiment of the present invention, a flow air layer may be formed in a space between the discharged fine fibers and the inner surface.

According to another embodiment of the present invention, the temperature of the flowing air layer may be 30 to 80 ° C.

According to another embodiment of the present invention, the step S2 may include a step of forming a pre-sealant layer on the inner surface of the tire before the lamination of the fine fiber layers.

On the other hand, the present invention provides a tire manufactured by the above-described manufacturing method.

According to the present invention, the flowability of the sealant changed by the external heat is compensated to maintain the sealant layer at a high temperature environment to maintain the sealant layer. On the contrary, at low temperatures, the sealant layer is forcedly flowed to remove the puncture- There is an effect that can be.

1 is a process flow chart showing the manufacturing method of the present invention over time,
Fig. 2 is a conceptual illustration of a shape of a tire applied with fine fiber radiation by fiber electrospinning of a voltage difference (V) according to the present invention on the basis of a side surface of a tire,
FIG. 3 is a cross-sectional view of the tire of FIG. 2, showing the shape in which microfibers are electrospun in the tire,
FIG. 4 is a view showing the shape of fine fibers stacked on the portion indicated by III in FIG. 3,
FIG. 5 is a view showing a shape in which a tire punctures due to a sharp foreign object, and a foreign matter enters a fine fiber layer and a sealant layer. FIG. 5A shows a side view of a foreign matter P penetrating through the tire, b) is a diagram showing a foreign substance entering into between fine fibers in a plan view,
FIG. 6 (a) and FIG. 6 (b) are side views showing a portion in which the foreign material P is removed and the microfibre layer and the sealant layer are buried in the punctured portion, Is a figure showing the shape of a microstructure into a punctured part and introducing a sealant in a plan view.
7 is an upper half sectional view of a conventional tire.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the exemplary embodiments of the present invention, descriptions of techniques that are well known in the technical field of the present invention and are not directly related to the present invention will be omitted. So that they can communicate more clearly.

In the drawings, some of the constituent elements are omitted or schematically shown, and the size of each constituent element does not entirely reflect the actual size. The same reference numerals are assigned to the same or corresponding components throughout the accompanying drawings.

Fig. 1 is a process flow chart showing the manufacturing method of the present invention over time, and Fig. 2 is a graph showing the shape of a tire applied with fine fiber radiation by fiber electrospinning of a voltage difference (V) according to the present invention, Fig. 3 is a cross-sectional view of the tire of Fig. 2, showing the shape in which microfibers are electrospun within the microfibers. Fig. 4 is a view showing the shape of the microfibers stacked on the portion indicated by III in Fig. FIG. 5 is a view showing a shape in which a tire punctures due to a sharp foreign object, and a foreign matter enters a fine fiber layer and a sealant layer, wherein (a) shows a shape in which a foreign matter (P) (B) is a plan view showing a foreign object entering between the microfibers, FIG. 6 is a view showing a state in which the foreign matter of FIG. 5 is removed and the microfibers (A) shows a side where the foreign substance (P) is removed, and (b) shows a case in which microfibers enter the punctured portion and the shape into which the sealant is introduced is a flat This is a picture that shows as a reference.

A method of manufacturing a tire of a sealant layer having excellent fineness according to the present invention comprises the steps of: (S1) rotating an electrically grounded tire (100); and moving the fine nozzle (200) having a voltage difference from the grounded tire (S2) of laminating the fine fiber layer (300) on the inner surface by electric field with the fine fiber (310) by discharging the fiber stock solution by orienting the fine fiber layer (110) (S3) of forming the first electrode (400).

The tire 100 may be a pneumatic tire and is not particularly limited as long as it is a tire which may be a problem when air inside the punk is leaked.

The inner liner may be an inner surface of the tire, and the fine fiber layer 300 may be formed on the inner surface of the inner liner.

First, step S1 is a step of rotating the electrically grounded tire 100 in a predetermined direction (R), which means that it precedes the step of laminating the fine fiber layer 300 in the next step S2, This does not mean that the tire must always rotate, but it can be understood as meaning that fine fibers are laminated on the inner surface of the tire with the fine fiber layer, and the tire rotates.

Here, the collector (C) for pulling the spun fine fibers 310 may be directly grounded to the tire to have a voltage difference (V) electrically with the fine nozzles 200 of the step S2. However, The collector C can be disposed through the adhered surface of the tire in the direction in which the fiber stock solution 320 is radiated from the nozzle outlet 210 of the fine nozzles to the collector of the fine nozzles and the counter electrode And may be a bar type or a plate type.

The fiber stock solution 320 is stored in a separate undiluted tank T so as to be supplied to the fine nozzles 200 and supplied to the fine nozzles by compressed air (not shown) And the fiber raw material thus radiated can control the length or diameter of the fiber by the diameter of the nozzle outlet, the discharge speed, and the applied voltage.

However, since the microfibers are discharged by the electrospinning in the electric field to be described later, the pressurized air serves to supplement the fiber stock solution to the fine nozzles.

The fiber stock solution 320 is not particularly limited as long as it can emit in the electric field to have directionality, but it may be made of a material such as nylon, polyamide, polyvinyl alcohol, polyvinyl acetate Poly Vinyl Acetate, Poly Acrylonitrile, Poly Carbonate, Cellulose, Poly Ethylene, Poly Propylene, and Poly Ester. , And the solvent to be uniformly dispersed therein is at least one selected from the group consisting of ethanol, acetic acid, toluene, benzene, dimethyl-formamide, formaldehyde, diethyl-formamide ) Or water may be used alone or in combination. In this case, the solvent is discharged and radiated to form fine fibers 310 forming the fine fiber layer 300 on the inner surface 110 of the tire, It is preferred.

Next, in step S2, the fine nozzles 200 having a voltage difference from the grounded tire are oriented on the inner surface 110 of the tire to discharge the fiber stock solution, and the fine fiber 310 is irradiated with the fine fiber layer 300, Is laminated on the inner surface.

The fine nozzles are arranged to be spaced apart from each other by a predetermined distance so as to face the inner surface of the tire. A voltage is applied to the fine nozzles. The voltage may be a voltage generator (not shown), and the voltage may be 3 to 50 kV.

If it is less than 3 kV, the solution may not be discharged and the fiber may not be produced. Conversely, if it exceeds 50 kV, the fiber diameter may be narrowed and it may be difficult to move by foreign matter. .

This voltage causes an electrospinning phenomenon in the fiber stock solution filled in the fine nozzles, which deforms the shape of the liquid when the electroconductive liquid is exposed to an electric field and discharges wire-like.

In addition, since the microfibers are laminated on the inner surface of the tire to form a microfibre layer, irregular microfibers are stacked rather than a regular shape to form a microfibre layer, which is effective in filling the puncture site. A fluidized air layer E can be formed in the space between the inner surface 310 and the inner surface 110, which can be supplied into the tire through an air blower (not shown).

In addition, the flow air layer E may have a temperature of 30 to 80 ° C to rapidly evaporate the solvent remaining in the fine fibers.

If the temperature is lower than 30 ° C, the solvent may not be evaporated and may not be left as fibers, but may be formed into a fine net shape. On the other hand, when the polymer has a melting point lower than 80 ° C,

The next step S3 is a step of forming the sealant layer 400 by topping the sealant liquid on the fine fiber layer.

The sealant solution is not particularly limited as long as it is a sealant capable of entering the puncture site at the time of tire puncture and temporarily covering the puncture. The sealant solution may be sealed with a viscous liquid phase such as a polymer, a low molecular elastomer, modified asphalt, latex, polyvinyl alcohol And a solvent having a tackifier, an anti-freezing agent, and other functional additives can be added.

The sealant liquid may be topped up to the upper portion of the microfibre layer 300 and filled with the microfibre layer in a flowable manner.

The sealant solution may have a preliminary sealant layer (not shown) previously applied to the inner surface 110 of the tire before the fine fiber layer is laminated. And it means a kind of a primer layer.

The pre-sealant layer may be the same component as the sealant layer or may be a sealant of another component, but the viscosity is preferably lower than the viscosity of the sealant layer because the microfibers having a diameter of several tens of nanometers to several tens of micrometers So that it is advantageous to have a low viscosity in order to be seated and fixed to the preliminary sealant layer.

Also, by forming the fine fiber layer by electrospinning in the preliminary sealant layer and topping the sealant layer on the preliminary sealant layer in this way, it is possible to solve the problem that the sealant layer is difficult to be uniformly dispersed.

5 and 6, even when the viscosity of the sealant layer increases or decreases due to the external season or temperature difference, the fine fiber layer 300 and the sealant layer 400 can be separated from the foreign material P, It is possible to move or move along the punctured portion like a foreign substance when removing it, so that the entangled sealant can flow along the punctured portion to temporarily prevent the puncture.

The tire 100, the inner surface 110,
The fine nozzles 200, the nozzle outlets 210,
The fine fiber layer 300, the fine fibers 310,
The fiber stock solution 320, the sealant layer 400,
The collector C, the flowing air layer E,
The foreign matter P, the rotational direction R,
The stock tank (T), the voltage difference (V)

Claims (5)

delete delete delete Rotating the electrically grounded tire (S1);
(S2) aligning a fine nozzle having a voltage difference with the grounded tire to the inner surface of the tire and discharging the fiber stock solution to laminate the fine fiber layer on the inner surface with an electric field with the fine fiber; And
(S3) of forming a sealant layer by topping a sealant liquid on top of the fine fiber layer,
Wherein a flow air layer is formed in a space between the discharged fine fibers and the inner surface, the temperature of the flowing air layer is 30 to 80 ° C,
The step S2 includes forming a preliminary sealant layer on the inner surface of the tire before lamination of the fine fiber layers,
Wherein the pre-sealant layer may be the same component as the sealant layer or may be a sealant of another component, but the viscosity is lower than the viscosity of the sealant layer.
A tire of a sealant layer having excellent fineness, which is produced by the manufacturing method of claim 4.

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