KR101663894B1

KR101663894B1 - The manufacturing method of the multiple hardness tire

Info

Publication number: KR101663894B1
Application number: KR1020150045542A
Authority: KR
Inventors: 정유주
Original assignee: 정유주
Priority date: 2015-02-11
Filing date: 2015-03-31
Publication date: 2016-10-14
Also published as: KR20160098943A

Abstract

A multi-hardness bicycle tire according to the present invention is a multi-hardness bicycle tire including a ring-shaped tire base, a tread portion having a predetermined pattern formed along an outer circumferential surface of the tire base, The tire according to any one of claims 1 to 3, further comprising: a wheel having a projection formed in a side direction of the tire base and coupled with the rim fastening part; and an elastic part formed inside the tire base to absorb shock applied to the tire. Hardness bicycle tires and manufacturing methods.

Description

Technical Field [0001] The present invention relates to a multi-hardness bicycle tire,

The present invention relates to a multi-hardness bicycle tire which is manufactured in such a manner that an EVA foam foam excellent in elasticity is provided in place of a tube in a tire and which exhibits the same or superior performance as a general tire, and a method of manufacturing the same. A multi-hardness bicycle tire capable of producing a tire inside a mold without a separate joining step by inserting a material constituting the outside in the state of inserting the formed middle plate and inserting a foam having an elastic force into a space formed by the protrusions of the middle plate; Concerning the production method thereof.

Generally, a tire is constructed such that an outer surface directly contacting with a roughened surface is made of a durable rubber excellent in abrasion resistance, and a tube filled with high-pressure air is provided on the inner side in order to maintain an elastic force to raise a ride feeling.

Such a conventional tire is coupled to the end of a moving object such as a self-weight, a bicycle, a motorcycle, a handcart, and is rotationally driven.

However, in the tire having the above-described construction, the tube provided inside the tire is broken by a nail or a sharp material due to the use for a long time and punctures are generated. As a result, the performance of the tire is not exhibited properly, The air pressure of the tube is weakened and the stable tire performance can not be exhibited.

If the air pressure of the tube is weak, it can be reused through a device that fills the air pressure. However, if the tube inside the tire is damaged by a nail or a sharp material, it is necessary to repair the damaged part or to replace the tube And difficulties.

The multi-hardness bicycle tire of the present invention and the method of manufacturing the same are different from the conventional structure in which a tube for maintaining the air pressure is provided inside the tire. In contrast to the structure in which a tire used for a bicycle or a rear car is not provided with a tube, The present invention also provides a multi-hardness bicycle tire having the same performance as a conventional tire by inserting a material.

In addition, the multi-hardness bicycle tire manufactured by the manufacturing method of the present invention eliminates the tube structure that maintains the air pressure, so that even if the tire is damaged by a nail or a sharp material, Another object of the present invention is to provide a hardness bicycle tire and a manufacturing method thereof.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems to be solved by the present invention, which are not mentioned here, can be clarified to those skilled in the art from the following description It can be understood.

A multi-hardness bicycle tire according to the present invention is a multi-hardness bicycle tire comprising: a ring-shaped tire base; a tread portion having a predetermined pattern formed along an outer circumferential surface of the tire base; The tire includes a wheel which is formed with a protrusion in the lateral direction of the tire base and is engaged with the rim fastening part, and an elastic part formed inside the tire base and absorbing impact applied to the tire.

The elastic portion is provided on the inner side of the tire base and is formed of a foaming agent.

A first mold releasing step of releasing the upper mold and the lower mold, each of which is formed with depressions depressed like a horizontal cross section of a tire shape, from each other, and a second mold releasing step of inserting the upper mold and the lower mold, A first mold closing step of closing the upper mold and the lower mold in a state in which the middle plate is inserted into the depression, and a second mold closing step of closing the first mold closing step A mold preheating step of preheating the mold closed at a temperature of 80 to 100 ° C. in a mold and a tire base space formed by the inside of the depression and the outside of the middle plate through an injection port formed at one side of the upper mold and the lower mold, 110, and the EVA foam injected into the mold is heated at a temperature of 150 to 200 for 10 to 30 seconds A second mold opening step of opening the mold by separating the upper mold and the lower mold from each other after the first curing step; and a second mold releasing step of releasing the mold from the upper mold and the lower mold, A foam insert step of inserting an EVA foam foam having an elastic force into a space formed by the protrusions of the middle plate in the tire base; A second mold closing step of closing the mold by bringing the upper mold and the lower mold into close contact with each other; and a second mold closing step of closing the mold by closing the upper mold and the lower mold to prevent the product inside the mold from being cured after the second mold closing step. A second curing step of holding the cured material in the second curing step for a second time, And an aging step of immersing the demolded formed product in a molding die.

The EVA foam is injected to form the tire base, and the EVA foam is inserted into the elastic part.

The EVA foams and the EVA foam foams of different properties injected in the raw material injecting step and the foam inserting step are cured by bonding to each other in the second curing step, so that a separate bonding step is not required.

The EVA foams inserted in the foam insertion step are formed in a shape corresponding to the formation of the protrusions so as to be inserted into the inside of the tire base, .

The EVA foam foam to be inserted in the foam inserting step includes a foam mold preheating step of closing the foam mold composed of the upper mold and the lower mold in which the grooves corresponding to the shape of the middle plate projection are formed and preheated to 80 to 100, A step of injecting the EVA foam injected into the foam mold through the injection port formed at one side at a temperature of 80 to 110; and a step of injecting the EVA foam injected in the foam material injecting step into the EVA foam at a temperature of 20 To 30 degrees Celsius; a foam mold opening step of opening the foam mold after the foam mold cooling step; and a step of releasing the EVA foam cured in the foam mold opening step in the foam mold And a foam demolding step.

The EVA foam foam of the foam inserting step is preheated for 1,500 seconds to 2,000 seconds at 50 to 80 oven periods before being inserted in the foam inserting step.

1 is a flowchart showing a method of manufacturing a multi-hardness bicycle tire according to the present invention.
FIG. 2 is a flow chart showing a process of manufacturing a foamed EVA foam in a method of manufacturing a multi-hardness bicycle tire according to the present invention.
3 is a sectional view showing a multi-hardness bicycle tire according to the present invention.
4 is a side sectional view of a mold and a middle plate of a method of manufacturing a multi-hardness bicycle tire according to the present invention.
5 is a side cross-sectional view schematically illustrating the working sequence of a method of manufacturing a multi-hardness bicycle tire according to the present invention.

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent by reference to an embodiment which will be described in detail below with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the accompanying drawings.

3 is a side sectional view showing a tire of a multi-hardness bicycle according to the present invention.

First, as shown in FIG. 1, the multi-hardness bicycle tire according to the present invention shows the most basic structure and structure of the present invention and is mainly used as a tire for a bicycle or a wheelbarrow, , And military tires that require continuous performance of tires in operational areas.

A multi-hardness bicycle tire according to the present invention includes a ring-shaped tire base 10, a tread portion 12 having a predetermined pattern formed along an outer circumferential surface of the tire base 10, A wheel 14 formed with a protrusion in the lateral direction of the tire base 10 so as to be coupled with the rim fastening portion 16 and a wheel 14 formed inside the tire base 10 to absorb a shock applied to the tire, And an elastic portion 20.

First, in a multi-hardness bicycle tire according to the present invention, a tire base 10 is provided. The tire base 10 is formed in a ring shape and has a predetermined thickness.

On the outer circumferential surface of the tire base 10, a tread portion 12 is provided. The tread portion 12 is formed along the outer circumferential surface of the tire base 10 and protrudes to form a predetermined pattern.

That is, the tread portion 12 forms the outer surface of the tire base 10, and a certain pattern formed on the tread portion 12 serves to reduce the contact area with the ground.

This is because a pattern protruding from the tread portion 12 is formed to be spaced apart from the ground surface of the tire by a predetermined distance along the outer circumferential surface and a gap is formed between protrusions formed on the tread portion 12, The water film phenomenon is reduced, the drainage performance is improved, and the elastic effect of the tire itself is increased, thereby improving ride comfort.

A wheel 14 is provided on the inner circumferential surface of the tire base 10.

The wheel 14 is formed in a ring shape along the inner circumferential surface of the tire base 10, and a protrusion is formed in a lateral direction of the tire base 10.

The projections formed on the wheel 14 are fastened to the rim fastening portions 16 forming the framework of the tire. That is, the rim fastening portion 16 is formed so as to surround the projecting portion of the wheel 14.

Inside the tire base 10, an elastic portion 20 is provided. The elastic portion 20 is made of a material having an elastic force different from the material of the tire base 10 having wear resistance capable of withstanding friction with the ground.

That is, the elastic portion 20 substantially absorbs impact applied to the tire, which is performed by the conventional tire tube. Therefore, the elastic portion 20 absorbs the impact applied to the tire from the ground by the elastic portion 20, thereby raising the ride feeling.

In addition, the multi-hardness bicycle tire according to the present invention is characterized in that the elastic portion 20, which provides the same or elevated elastic force without storing the air inside instead of the conventional tire tube, There is an effect that it is possible to implement a tire that maintains elasticity even if it is broken.

A method of manufacturing a multi-hardness bicycle tire according to the present invention includes a first mold (32) and a second mold (34) which are separated from each other by an upper mold (32) and a lower mold (34), in which depressions (40) A middle plate inserting the middle plate 50 inserted horizontally into the depressions 40 of the upper mold 32 and the lower mold 34 and having protrusions formed in one side and the other side, A first mold closing step S3 in which the upper mold 32 and the lower mold 34 are brought into close contact with each other while the middle plate 50 is inserted into the depression 40, A mold preheating step S4 for preheating the mold 32 closed at the first mold closing step S3 to a temperature of 80 to 100 and a mold preheating step S4 for preheating the mold 32 closed at the inlet mold opening 32 formed at one side of the upper mold 32 and the lower mold 34, The EVA foam is placed in the tire base space formed by the inner side of the depression 40 and the outer side of the middle plate, And the EVA foam 42 injected into the tire base space in the depressed portion 40 in the raw material injecting step S5 is heated at a temperature of 150 to 200 for 10 seconds to 200 seconds, A first curing step S6 for curing the upper mold 32 and the lower mold 34 after the first curing step S6, A second mold releasing step S7 and a middle plate removing step of removing the middle plate 50 through a space where the upper mold 32 and the lower mold 34 are spaced apart from each other in the second mold opening step S7 (S9) for inserting an EVA foam foam having an elastic force into a space formed by the protrusions of the middle plate (50) in the tire base; and a foam inserting step 32) and the lower mold (34) to close the mold (30), and a second mold closing step (S10) A second curing step S11 for maintaining the material injected into the depression 40 after the closing step S10 for a time of 1,000 seconds to 1,500 seconds in a state of 150 to 200 so as to be cured; A demolding step S12 of demolding the cured material in the upper mold 32 and the lower mold 34 and an aging step S13 of immobilizing the demolded molding in the molding die in the demolding step S12, .

First, in the method of manufacturing a multi-hardness bicycle tire according to the present invention, the first mold opening step S1 for opening the upper mold 32 and the lower mold 34 is performed. In the first mold opening step S1, the upper mold 32 and the lower mold 34, in which the depressions 40 are recessed in the form of a ring like a tire, are separated from each other.

Here, the mold 30 is composed of an upper mold 32 and a lower mold 34.

That is, the mold 30 is composed of the upper mold 32 and the lower mold 34, and at the portion where the upper mold 32 and the lower mold 34 are in contact with each other, (40) are formed.

More specifically, the recessed portion 40 has a horizontal cross-sectional shape of the tire base 10 and the wheel 14 formed in the upper mold 32 and the lower mold 34, respectively.

Next, the middle plate inserting step (S2) is performed. In the middle plate inserting step (S2), a ring-shaped middle plate (50) inserted horizontally into the depression and formed with projections (25) in one side and the other side is inserted.

At this time, the projection 25 of the middle plate 50 is positioned at the center of the depression 40.

This is because a space is formed between the outside of the projection 25 of the middle plate 50 and the inside of the depression 40 and the EVA foam 42 is injected into the space to manufacture the tire base 10 do.

Next, the first mold closing step S3 is performed. In the first mold closing step, the upper mold 32 and the lower mold 34 are brought into close contact with each other while the middle plate 50 is inserted in the center of the depression 40.

Next, the mold preheating step S4 is performed. In the mold preheating step S4, the closed mold 30 is preheated to a temperature of 80 to 100 ° C. This is because it is possible to preheat the mold 30 to 80 to 100 and to maintain the liquid state when the EVA foam 42 injected in the raw material injecting step S5 described below is injected into the mold 30 It plays a role.

Next, the raw material injecting step (S5) is performed. The material injection step S5 is a step of injecting material EVA into the tire base space formed by the inside of the depression 40 and the outside of the middle plate 50 through the injection port formed at one side of the upper mold 32 or the lower mold 34, The foam 42 is injected.

That is, in the step S5 of injecting the raw material, the EVA foam 42 constituting the tire base 10 is injected to manufacture the tire base.

The EVA foam 42 injected in the raw material injecting step S5 injects the EVA foam 42 into the mold 30 at a temperature of 80 to 110 ° C. This is to inject the EVA foam 42 at a temperature similar to the preheated temperature in the mold preheating step S4 so that the EVA foam 42 can be injected into the mold in a liquefied state.

Next, the first curing step S6 proceeds. The first curing step S6 is a step of heating the EVA foam 42 injected into the tire base space inside the depressed portion 40 in the raw material injecting step S5 at a temperature of 150 to 200 for 10 to 30 seconds . That is, the waiting time of 10 seconds to 30 seconds of the first curing step S6 serves to cure enough to remove the middle plate 50, which will be described below.

Next, the second mold opening step S7 is performed. In the second mold opening step S7, the mold 30 is opened by separating the upper mold 32 and the lower mold 34 from each other after the first curing step S6.

Next, the middle plate removing step (S8) is performed. Next, the middle plate removing step (S8) is performed. The middle plate removing step S8 removes the middle plate 50 through the space where the upper mold 32 and the lower mold 34 are spaced apart from each other in the second mold opening step S7.

That is, when the EVA foam 42 injected into the depressed portion 40 in the first curing step S6 is cured for 10 seconds to 30 seconds, the middle plate removing step S8 is performed, The middle plate 50 located at the center 40 is removed.

Next, the form insertion step S9 is performed. In the foam inserting step S9, an EVA foam foam 44 having an elastic force is inserted into the inside of the tire base 10 formed inside the depression.

That is, the EVA foam foam 44 is inserted into the tire base 10 instead of the conventional tire tube.

Next, the second mold closing step S10 is carried out. In the second mold closing step S10, after the foam insertion step S9, the upper mold 32 and the lower mold 34 are closely contacted to close the mold.

Next, the second curing step S11 is performed. In the second curing step S11, the temperature of the product is set to be in the range of 150 to 200 so as to be cured while expanding the EVA foam 42 and the EVA foam foam 44 injected into the depression 40, And is maintained during the process time.

That is, in the second curing step S11, the raw material injected into the depressed portion 40 is cured while expanding, and is cured in the shape of a tire by the shape formed in the depressed portion 40.

In addition, in the second curing step S11, the EVA foam 42 and the EVA foam foam 44 having different properties are inflated and cured inside the depression 40 and adhered to each other.

This is because the raw material having different physical properties is formed in a separate mold and the raw material having different physical properties is formed and adhered in the single mold 30 in the step of bonding by adhesive.

Next, the demolding step S12 is performed. In the demolding step S12, the material that has been inflated and hardened in the second curing step S11 is demolded from the mold 30.

That is, the product, which has been inflated and hardened by the depression 40 formed in the mold 30, is finally separated from the mold 30.

Next, the aging step (S13) is performed. In the aging step (S13), the molded article demolded in the demixing step (S12) is fixed to a molding die and aged. That is, in the aging step (S13), the product is immersed in a molding frame to prevent deformation of the product.

The EVA foam foam 44 to be inserted in the foam inserting step S9 is formed by closing the foam mold composed of the upper mold and the lower mold in which the groove corresponding to the shape of the projection 52 of the middle plate 50 is formed (S21) for injecting the EVA foam, which is injected into the foam mold through the injection port formed at one side of the foam mold, at a temperature of 80 to 110, A foam mold cooling step (S22) for cooling the foam mold so that the EVA foam is heated to a temperature of 20 to 30 after a predetermined period of time after the injection of the EVA foam in the foam material injecting step (S21); and the foam mold cooling step , A foam mold releasing step (S23) for opening the upper mold and the lower mold, and a foam removing step (S24) for releasing the EVA foam cured in the foam mold opening step (S23) in the foam mold .

First, the EVA foam foam 44 proceeds to the foam mold preheat step S20. In the foam mold preheating step S20, the foam mold composed of the upper mold and the lower mold in which the groove corresponding to the shape of the middle plate projection is formed is closed to be preheated to 80-100. This serves to enable the EVA foam introduced into the foam mold to be injected into a liquefied state without being cured inside the foam mold.

Next, the foam material injecting step S21 is performed. The foam material injecting step (S21) injects the EVA foam injected into the foam mold through the injection port formed at one side of the foam mold at a temperature of 80-110. This is to inject liquid at a temperature similar to the temperature of the foam mold and to be injected into the foam mold in a liquid state.

Next, the foam mold cooling step S22 is performed. In the foam mold cooling step S22, the foam mold is cooled so that the EVA foam is heated to a temperature of 20 to 30 after a predetermined time period of the EVA foam injected in the foam material injecting step (S21). This serves to prevent the EVA foam from foaming to the last. That is, the EVA foam foam 44 having been subjected to the foam mold cooling step S22 is not finally foamed but may be finally foamed in the second curing step S11 to be produced as a product.

Next, the foam mold cooling step (S22) is followed by a foam mold opening step (S23) for opening the foam mold. That is, the foam mold releasing step (S23) serves to release the cooled foam mold so that the EVA foam foam 44 can be demolded from the foam mold.

Next, the foam demolding step (S24) is performed. In the foam demolding step (S24), the EVA foam foam cured in the foam mold releasing step (S23) is demolded in the foam mold.

In addition, the EVA foam foam 44 to be inserted in the foam insertion step S9 is preheated for 1,500 seconds to 2,000 seconds in a 50 to 80 oven period before being inserted in the foam insertion step S9. This serves to preheat the EVA foam foam 44 to a temperature similar to the temperature inside the mold 30 to prevent the EVA foam 42 from hardening.

The protrusions 25 formed on the outer surface of the middle plate 50 may be formed continuously or spaced apart from each other at regular intervals. That is, the projections 25 formed on the outer surface of the middle plate 50 form a space for inserting the EVA foam foam 44 inserted in the foam insertion step S9 into the tire base 10 . Therefore, when the protrusions 25 formed on the outer surface of the middle plate 50 are continuously formed, the EVA foam foam 44 is also formed in a continuous ring shape, and the protrusions 25 are formed The EVA foam foam 44 is formed in a shape corresponding to the protrusion formation and is inserted.

As described above, it is to be understood that the technical structure of the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, All changes or modifications that come within the scope of the equivalent concept are to be construed as being included within the scope of the present invention.

S1: first mold opening step
S2: Insertion of the middle plate
S3: first mold closing step
S4: mold preheating step
S5: Feeding step
S6: First curing step
S7: second mold opening step
S8: Step of removing the middle plate
S9: Steps to insert form
S10: Second mold closing step
S11: Second curing step
S12: De-molding step
S13: Aging stage
10: Tire base
12: Tread portion
14: Wheat
16:
20:
30: Mold
32: upper mold
34: Lower mold
40:
42: EVA foam
44: EVA foam foam
50: Middle plate
52: projection

Claims

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A first mold releasing step of releasing the upper mold and the lower mold, in which depressed portions are recessed as in a horizontal cross section of the tire shape, from each other;
A middle plate inserting step of inserting a middle plate inserted horizontally into depressions of the upper mold and the lower mold and having protrusions formed in one side and the other side;
A first mold closing step of closing the upper mold and the lower mold while the middle plate is inserted into the depression;
A mold preheating step of preheating the mold closed at the first mold closing step to a temperature of 80 to 100;
A raw material injection step of injecting the EVA foam at a temperature of 80 to 110 in a tire base space formed by the inside of the depression and the outside of the middle plate through an injection port formed at one side of the upper mold and the lower mold;
A first curing step of curing the EVA foam injected into the mold at a temperature of 150 to 200 for 10 seconds to 30 seconds;
A second mold opening step of opening the mold by separating the upper mold and the lower mold from each other after the first curing step;
A middle plate removing step of removing the middle plate through a space where the upper mold and the lower mold are spaced apart from each other in the second mold opening step;
A foam inserting step of inserting an EVA foam foam having an elastic force into a space formed by the projections of the middle plate in the tire base;
A second mold closing step of closing the mold by closely contacting the upper mold and the lower mold after the foam inserting step;
A second curing step of maintaining the temperature of the product in a state of from 150 to 200 for a period of from 1,000 seconds to 1,500 seconds so that the product inside the mold is cured after the second mold closing step;
A demolding step of demolding the cured material in the mold in the second curing step; And
An aging step of immersing the molded article demolded in the demolding step in a mold;
Wherein the method comprises the steps of:

The method of claim 3,
In the raw material injecting step,
Wherein an EVA foam is injected to form the tire base, and an EVA foam is inserted into the elastic portion.

The method of claim 3,
The EVA foams and the EVA foam foams of different properties injected in the raw material injecting step and the foam inserting step,
Wherein the second hardening step is performed by adhering and curing to each other so that no separate bonding process is required.

The method of claim 3,
On the outer surface of the middle plate,
Wherein an EVA foam inserted in the foam insertion step is formed in a shape corresponding to the formation of the protrusion and is inserted into the tire base in the inside or outward direction. Hardness bicycle tire manufacturing method.

The method of claim 3,
The EVA foam foam, which is inserted in the foam insertion step,
A foam mold preheating step of closing the foam mold composed of the upper mold and the lower mold in which the groove corresponding to the shape of the middle plate projection is formed, and preheating the foam mold to 80 to 100;
A foam material injecting step of injecting the EVA foam injected into the foam mold through the injection port formed at one side of the foam mold at a temperature of 80 to 110;
A foam mold cooling step of cooling the foam mold so that the EVA foamed material injected in the foam material injecting step is heated to a temperature of 20 to 30 after a predetermined time;
A foam mold opening step of opening the foam mold after the foam mold cooling step; And
And a foam demolding step of demolding the EVA foam cured in the foam mold releasing step in the foam mold.

8. The method according to claim 3 or 7,
The EVA foam foam of the foam insertion step,
Wherein the preheating is performed at a time of 1,500 seconds to 2,000 seconds at 50 to 80 oven stages before being inserted in the foam inserting step.