KR101728679B1 - Manufacturing method Pneumatic tire comprising back-up liner - Google Patents

Manufacturing method Pneumatic tire comprising back-up liner Download PDF

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Publication number
KR101728679B1
KR101728679B1 KR1020150126411A KR20150126411A KR101728679B1 KR 101728679 B1 KR101728679 B1 KR 101728679B1 KR 1020150126411 A KR1020150126411 A KR 1020150126411A KR 20150126411 A KR20150126411 A KR 20150126411A KR 101728679 B1 KR101728679 B1 KR 101728679B1
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KR
South Korea
Prior art keywords
liner
length
carcass ply
inner liner
layer
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KR1020150126411A
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Korean (ko)
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KR20170029278A (en
Inventor
김홍순
김지원
Original Assignee
금호타이어 주식회사
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Priority to KR1020150126411A priority Critical patent/KR101728679B1/en
Publication of KR20170029278A publication Critical patent/KR20170029278A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
    • B29D30/16—Applying the layers; Guiding or stretching the layers during application
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
    • B29D30/16—Applying the layers; Guiding or stretching the layers during application
    • B29D30/1607—Applying the layers; Guiding or stretching the layers during application by feeding a sheet perpendicular to the core axis and joining the ends to form an annular element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
    • B29D30/16—Applying the layers; Guiding or stretching the layers during application
    • B29D2030/1664—Details, accessories or auxiliary operations not provided for in the other subgroups of B29D30/00
    • B29D2030/1685—Details, accessories or auxiliary operations not provided for in the other subgroups of B29D30/00 the layers being applied being already cut to the appropriate length, before the application step

Abstract

The present invention relates to a method of manufacturing a pneumatic tire capable of improving the air permeability by laminating a backing liner between a carcass ply and an inner liner, wherein the inner liner is laminated on the backing liner to form a liner layer Winding a carcass ply on the liner layer so that the liner layer and the carcass ply have overlapping portions where one end and the other end overlap each other; Layer and the backup liner are the same, and the inner air permeability can be improved with a liner layer having an appropriate thickness, and a uniformity can be ensured.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a pneumatic tire including a backing liner, and more particularly to a method of manufacturing a pneumatic tire which can improve the air permeability by laminating a backup liner between a carcass ply and an inner liner will be.

Since the load of the vehicle body is equally supported by the respective tires when the vehicle is running, if the air inside the tire leaks, the stress is concentrated, which causes traffic accidents. Therefore, even if the vehicle is operated for a long period of time, the internal air pressure of the tire must be maintained at an appropriate value. In this connection, the inner liner is arranged in the circumferential direction at the innermost end in the radial direction of the pneumatic tire to prevent the inner air from leaking.

Background Art [0002] Conventionally, there has been studied a method of reducing the amount of air leaked by increasing the inner liner in order to improve the air permeability of pneumatic tires. Patent Document 1 has a layer B comprising a resin composition comprising an A-layer and an elastomer comprising a resin composition comprising an inner-liner barrier resin, and has a total of seven or more layers of A-layer and B-layer. However, if the thickness of the inner liner is increased indefinitely, the weight of the tire increases, resulting in an increase in fuel consumption and a problem of environmental pollution. In the manufacturing process of pneumatic tires, a green case is formed by performing lamination molding in which a sheet-like semi-finished product such as an inner liner and a carcass ply is wound around a molding drum. Thus, a part where both ends of the semi-finished product are overlapped becomes thick, Can fall. In addition, since the rubber composition of the inner liner and the carcass ply is aluid, the invention of Patent Document 1 has a problem that the airtightness of the carcass ply can not be secured by the exposed portion of the carcass ply.

Patent Document 1: Korean Published Patent Application No. 10-2011-0025597 (published on Mar. 10, 2011)

Disclosure of the Invention The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide a pneumatic tire capable of simultaneously securing airtightness and uniformity without increasing the thickness of the inner liner through a backup liner between the inner liner and the carcass ply. And a method for producing the same.

According to another aspect of the present invention, there is provided a pneumatic tire manufacturing method comprising the steps of forming a backing liner, an inner liner, and a carcass ply; forming a back liner, an inner liner and a carcass ply, A method of manufacturing a pneumatic tire including a vulcanizing process for pressurizing and heating a green case, the forming process comprising the steps of laminating an inner liner to a backing liner to form a liner layer, laminating a carcass ply to the liner layer, Winding a carcass ply on a forming drum such that one end and the other end of the carcass ply have an overlapping portion overlapping each other, wherein the carcass layer laminated with the carcass ply and the rubber composition constituting the backup liner are the same .

The length of the overlap portion in the circumferential direction is 0.5 to 3.0% of the length of the inner liner in the circumferential direction.

The length in the circumferential direction of the overlapping portion is 1.0 to 2.5% of the length of the inner liner in the circumferential direction.

Further, the carcass ply has an extending portion extending to the outer peripheral side of the overlap portion.

The length of the extended portion of the ply is in the range of 1.0 to 7.5% of the length of the inner liner in the circumferential direction of the carcass.

The length of the extended portion is 2.0 to 4.5% of the length of the inner liner in the circumferential direction.

The liner layer is characterized by having an extending portion extending to the inner circumferential side of the overlap portion.

The length of the extending portion of the liner layer is 0.3 to 4.0% of the length of the inner liner in the circumferential direction.

The length of the extended portion is 0.5 to 2.5% of the length of the inner liner in the circumferential direction.

According to the present invention, there is provided a pneumatic tire manufacturing method capable of improving the air permeability of a liner layer having an appropriate thickness and ensuring uniformity.

1 is a schematic cross-sectional view of a liner layer and a carcass ply wound on a building drum.
2 is a schematic cross-sectional view of a portion where the both end portions of the carcass ply are overlapped with the liner layer wound around the forming drum and the adjacent portion 22 thereof.
3 is a schematic cross-sectional view of the right half of the pneumatic tire.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals as possible denote the same elements as in the drawings, and the same reference numerals as possible denote the same elements in the drawings, And detailed description of the configuration will be omitted.

The present invention relates to a method of manufacturing a pneumatic tire including a backing liner, the schematic structure of a tire and the backing liner (11) of the present invention will be described with reference to the drawings. The pneumatic tire 100 includes a tread 14 arranged along the outer circumferential surface of the tire and a pneumatic tire 20 connected to both ends of the tread 14 and extending radially inward of the pneumatic tire 100, A sidewall 15 forming a circular opening around an axis of the pneumatic tire 100, a belt 13 located adjacent to the inside of the tread 14 and arranged in the circumferential direction of the pneumatic tire 100, a belt 13, A carcass ply (not shown) which is located adjacent to the inside of the sidewall 15 and arranged along the belt 13 and the sidewall 15 and turns up radially outward of the pneumatic tire 100 at the end of the sidewall 15 12, an annular bead 17 located at a portion where the carcass ply 12 is turned up and fixing the carcass ply 12, an apex 18 located radially outside the annular bead, The inner tire 100 is positioned at the innermost side of the mouth tire 100, Womb inner liner 10 is constituted by, or the like. The backing liner 11 is interposed between the inner liner 10 and the carcass ply 12 and is superimposed on the inner liner 10 and constitutes the liner layer 9 together with the inner liner 10.

The manufacturing method of the pneumatic tire 100 according to the present invention is characterized in that the process of laminating the carcass ply 12 and the liner layer 9 is a major feature, and thus a description of the basic structure of the tire will be omitted. The carcass ply 12 serves as a skeleton of the tire, and serves as an organic fiber cord layer to support the load and withstand the impact during traveling. The inner liner 10 serves to continuously maintain the proper amount of air pressure for supporting and effectively dispersing the load of the finished product tire. The rubber layer of the carcass ply 12 is provided between the carcass ply 12 and the inner liner 10 through the backing liner 11 in order to improve the air permeability of the carcass ply 12. [ Is exposed. The backing liner 11 and the carcass ply 12 use the same rubber composition. The compatibility of the backup liner 11 and the carcass ply 12 is increased so as to prevent air leakage of the pneumatic tire 100 through the cable exposure of the carcass ply 12. [

The manufacturing process of the finished pneumatic tire 100 includes a kneading process of kneading raw materials to make a compound, a pressing process of forming a semi-finished product of a tire, a molding process of molding a semi-finished product into a green case, And proceeds to a curing process. The manufacturing method of the pneumatic tire 100 according to the present invention is characterized in that the process of molding the semi-finished product into a green case is a key feature, and thus the basic manufacturing process of the tire will be omitted.

The molding process is carried out in the form of a sheet of an inner liner 10, a backing liner 11, a carcass ply 12, a sidewall 15, a bead 17, a belt 13 and a tread 14, (20) to form a green case. 1 is a cross-sectional view showing a schematic configuration of a liner layer 9 and a carcass ply 12 wound on a building drum. The inner liner 10 is superimposed with the backup liner 11 to form the liner layer 9. The carcass ply 12 is laminated to the liner layer 9 and the liner layer 9 and the carcass ply 12 are laminated, One end portion and the other end portion of the molding drum 20 are overlapped with each other and wound around the forming drum 20.

The overlapping portion means a point where one end portion and the other end portion of the carcass ply 12 and the liner layer 9 are overlapped with each other. One end of the liner layer 9 in the overlapping portion is positioned radially outward of the other end of the carcass ply 12 and is in contact with the other. One end portion and the other end portion of the carcass ply 12 are close to each other and one end portion of the liner layer 12 is interposed therebetween. One end portion and the other end portion of the liner layer 9 are close to each other and the other end portion of the carcass ply 12 is interposed therebetween. Is a portion indicated by a double-headed arrow b in Figs. The length in the circumferential direction of the overlapped portion means the length of the interface where one end of the liner layer 9 is positioned radially outwardly of the other end of the carcass ply 12 and is in contact with the other. The longer the circumferential length of the overlapping portion is, the lower the unity of the pneumatic tire 100, but the air permeability is improved. In the opposite case, the opposite result occurs, so it is necessary to calculate the proper length and secure both uniformity and confidentiality. Preferably, the length in the circumferential direction of the overlap portion is 0.5 to 3.0% of the circumferential length of the inner liner 10. More preferably, it is 1.0 to 2.5%. Since the inner liner 10 wound around the forming drum 20 has an irregular circular shape including an overlapping portion rather than a regular circular shape, the length of the inner liner 10 in the circumferential direction is shorter than the length of the forming drum 20 ) Is defined as the length of the semi-finished product sheet of the inner liner 10 before being wound.

Further, the present invention is characterized in that the carcass ply 12 has an extending portion 1 extending to the outer circumferential side of the overlap portion. The extended portion 1 means a portion where one end of the carcass ply 12 extends from one end of the liner layer 9 at one end of the carcass ply 12 and the liner layer 9. Is a portion indicated by a double-headed arrow c in Figs. As the length of the extension portion 1 becomes longer as in the circumferential length of the overlapping portion, the uniformity of the pneumatic tire 100 falls, but the air permeability is improved. Inverse, the opposite result occurs. Therefore, the appropriate length should be calculated. Preferably, the length of the extension portion 1 is 1.0 to 7.5% of the length of the inner liner 10 in the circumferential direction. More preferably, it is 2.0 to 4.5%.

Further, the present invention is characterized in that the liner layer (9) has an extending portion (2) extending toward the inner circumferential side of the intermediate portion. The extended portion 2 means a portion where the other end of the liner layer 9 extends from the other end of the carcass ply 12 at the other end of the carcass ply 12 and the liner layer 9. Is a portion indicated by a double-headed arrow a in Figs. As the length of the extended portion 2 becomes longer as in the circumferential length of the overlapping portion, the uniformity of the pneumatic tire 100 falls, but the air permeability is improved. Inverse, the opposite result occurs. Therefore, the appropriate length should be calculated. Preferably, the length of the elongated portion 2 is 0.3 to 4.0% of the circumferential length of the inner liner 10. More preferably, it is 0.5 to 2.5%.

The present invention is characterized in that the rubber material of the backup liner 11 and the carcass ply 12 are the same as those of the backup liner 11 described above and the overlap portion, the extension portion 1, and the extension portion 2 in the molding process The inner air permeability can be improved and the uniformity of the tire can be maintained without increasing the thickness of the inner liner 10.

The manufacturing method of the pneumatic tire according to the embodiment of the present invention is configured as described above. Hereinafter, a test was conducted to confirm the effect of the present invention.

[Comparative Example]

Wherein the length of the overlapping portion with respect to the circumferential length of the inner liner (10), the length of the extending portion (1), and the length of the extending portion (2) are 0%.

[Experimental Example 1]

Wherein the length of the overlapping portion with respect to the circumferential length of the inner liner (10) is 2.0%, the length of the extending portion (1) is 4.5%, and the length of the extending portion (2) is 0.3%.

[Experimental Example 2]

The pneumatic tire (100) according to any one of the preceding claims, wherein the length of the overlapped portion with respect to the circumferential length of the inner liner (10) is 0.5%, the length of the extending portion (1) is 4.5%, and the length of the extending portion (2) is 2.0%.

[Experimental Example 3]

The pneumatic tire (100) according to any one of the preceding claims, wherein the length of the overlapped portion with respect to the circumferential length of the inner liner (10) is 2.0%, the length of the extension portion (1) is 1.0% and the length of the extension portion (2) is 2.5%.

[Experimental Example 4]

The pneumatic tire (100), wherein the length of the overlapped portion with respect to the circumferential length of the inner liner (10) is 2.0%, the length of the extending portion (1) is 4.5%, and the length of the extending portion (2) is 2.5%.

The Air Loss (% / 30days) of the finished tire of the finished product is shown in Table 1 below, except for the conditions of the above Comparative Examples and Experimental Examples.

division Comparative Example Experimental Example 1 Experimental Example 2 Experimental Example 3 Experimental Example 4 Length of overlapping portion 0 2.0 0.5 2.0 2.0 Length of extension part 1 0 4.5 4.5 1.0 4.5 Length of extension part 2 0 0.3 2.0 2.5 2.5 Air permeability 2.54 1.98 1.56 1.58 1.43

Referring to Table 1, the air permeability of Experimental Examples 1, 2, 3 and 4 corresponding to the embodiment of the present invention was greatly improved. Further, the most excellent effect was shown in Experimental Example 4 in which the length of the overlapping portion, the length of the extending portion 1, and the length of the extending portion 2 were proper ratios.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be construed as being limited to the embodiments described, but should be determined by the scope of the appended claims, as well as equivalents thereof.

9: liner layer 10: inner liner
11: Backup Liner 12: Carcass Fly
13: Belt 14: Tread
15: side wall 17: bead
18: Apex 20: Forming drum
22: overlap portion and adjacent portion 100: pneumatic tire

Claims (9)

A forming step of forming a green case by molding the backup liner, the inner liner and the carcass ply, and a vulcanizing step of pressurizing and heating the green case, wherein the back liner, the inner liner and the carcass ply are formed A pneumatic tire manufacturing method comprising:
Wherein the forming step includes forming the liner layer by laminating the inner liner on the backing liner to form a liner layer on the liner layer, and stacking the liner layer and the carcass ply on one side and the other end, Winding on a forming drum to have a part,
The circumferential length of the overlap portion is 0.5 to 3.0% of the circumferential length of the inner liner,
Wherein the carcass ply has an extending portion extending to the outer circumferential side of the overlap portion, the length of the extending portion of the carcass ply is 1.0 to 7.5% of the circumferential length of the inner liner,
Wherein the liner layer has an extending portion extending to the inner circumferential side of the overlap portion, the length of the extended portion of the liner layer being 0.3 to 4.0% of the circumferential length of the inner liner,
Wherein the carcass layer in which the carcass ply is laminated and the rubber composition constituting the backup liner are the same. delete The method according to claim 1,
Wherein the circumferential length of the overlap portion is 1.0 to 2.5% of the circumferential length of the inner liner. delete delete The method according to claim 1,
Wherein the length of the extended portion of the carcass ply is 2.0 to 4.5% of the length of the inner liner in the circumferential direction. delete delete The method according to claim 1,
Wherein the length of the extended portion of the liner layer is 0.5 to 2.5% of the circumferential length of the inner liner.
KR1020150126411A 2015-09-07 2015-09-07 Manufacturing method Pneumatic tire comprising back-up liner KR101728679B1 (en)

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KR101728679B1 true KR101728679B1 (en) 2017-05-02

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010167829A (en) 2009-01-20 2010-08-05 Yokohama Rubber Co Ltd:The Pneumatic tire and method for manufacturing the same
JP2012240658A (en) 2011-05-24 2012-12-10 Yokohama Rubber Co Ltd:The Pneumatic tire

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4831706B2 (en) 2009-09-04 2011-12-07 住友ゴム工業株式会社 Polymer laminate and pneumatic tire using the same for inner liner

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010167829A (en) 2009-01-20 2010-08-05 Yokohama Rubber Co Ltd:The Pneumatic tire and method for manufacturing the same
JP2012240658A (en) 2011-05-24 2012-12-10 Yokohama Rubber Co Ltd:The Pneumatic tire

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