KR100788526B1 - Carcass gluing method of pneumatic tire - Google Patents

Abstract

A carcass bonding method of a pneumatic tire is provided to improve the exterior quality of the tire by bonding both ends of a carcass and then backstitching the carcass by synthetic fiber similar to the material of the carcass. A carcass bonding method of a pneumatic tire comprises the steps of: winding a carcass(14) along the outer surface of a forming drum(20) in molding the pneumatic tire; butt-bonding a joint part connecting both ends of the carcass; and backstitching the bonded part of the carcass by synthetic fiber(30). The synthetic fiber is made of materials with similar strength of the carcass. A green case is produced by a forming process for attaching the rest half-finished products by pressing a press roll while the carcass is connected to the outer surface of the forming drum.

Description

Carcass Gluing method of Pneumatic Tire

1 is a cross-sectional view showing a pneumatic tire according to the prior art.

Figure 2 is a schematic perspective view showing a state in which the carcass is bonded to the forming drum according to the prior art in an overlapping manner.

Figure 3 is a schematic perspective view showing a state in which the carcass is bonded to the molding drum according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

14: carcass,

20: forming drum,

30: synthetic fiber.

The present invention relates to a carcass bonding method of a pneumatic tire, and more particularly, after the pneumatic tire is molded by bonding the both ends of the carcass in a butt manner, and then sewn with synthetic fibers of a material similar to carcass. By doing so, the present invention relates to a carcass bonding method of pneumatic tires to improve appearance quality by preventing phenomena such as bulge, dent, and uniformity of the finished tire.

Generally, a pneumatic tire has a support function to support the entire load of the vehicle, a power transmission function to transmit the driving force and braking force of the vehicle to the road surface, a shock mitigation function to mitigate external shocks caused by irregular road surfaces, and the progress of the vehicle. It is equipped with a variety of position switching function for switching the position according to the direction.

The general structure of the tire 100 includes, as shown in FIG. 1, a tread 110 that is a thick rubber layer in direct contact with the road surface; A shoulder constituting a shoulder of the tire with the thickest thickness; Side wall (Side Wall, 112) to improve the ride comfort by the flexible stretching movement on the side of the tire and the type, size, manufacturer of the tire and the like; A bead part 113 covering the end of the cord to be mounted on the rim of the tire; Carcass (114) made of tire cord paper as a part which forms a skeleton of the tire and withstands air pressure and load or impact in the tire; The belt inserted to the inside of the tread 110 and the carcass 114 to mitigate the external impact when running, and prevents the crack or trauma of the tread 110 to reach the carcass 114 directly ( 115); The inner layer of the carcass 114 is made of an inner liner (Inner Linner, 116) to prevent the leakage of air.

Looking at the tire manufacturing process, the semi-finished products are manufactured for each of the various components of the tire, and the semi-finished products are sequentially wound on the forming drum of the tire molding machine, and then pressed by a squeezing roll to attach the semi-finished products to each other. After manufacturing the case (Green Case), the green case is put into the vulcanization mold and subjected to a vulcanization process of applying temperature and pressure to the inside of the green case with a bladder, to manufacture a tire that can actually be used.

In addition, in the green case forming process, the primary green case is molded into a primary molding, and the secondary green case is formed into two moldings, and the primary green case and the secondary case are shaped by shaping ( After shaping), the final green case is molded and then vulcanized. The primary green case refers to a case formed by assembling them through an inner liner, a carcass, a bead installation and turn-up process, and a sidewall attachment process using a forming drum and a pressing roll. The secondary green case is a belt or a cap. Refers to a case molded by assembling plies and treads. Such a green case molding method is well disclosed in Korean Patent Laid-Open Publication No. 2005-119028.

The carcass is an important part corresponding to a skeleton that is laminated at least one or more layers on the inner liner constituting the inner circumference of the tire to maintain tire strength and shape, maintain air pressure inside the tire, and withstand load and impact of the vehicle. It is made of several layers of rubber coated ply by rolling single materials such as polyester) and rayon.

As shown in FIG. 2, in the related art, when the pneumatic tire is formed, when the carcass 114 is wound on the outer surface of the forming drum 120 and connected both ends, the bulge phenomenon of the carcass 114 is opened. In order to prevent the overlapping method, ie, overlap (Overlap) is applied to the adhesive.

However, the carcass 114 is a problem that the dent phenomenon occurs at the overlapped portion due to the increased tension of the joint portion when the air injection on the finished product of the pneumatic tire, the bulge phenomenon still occurs, as well as the performance of the uniformity There was this.

The present invention has been made in order to solve the above problems, by connecting both ends of the carcass when forming a pneumatic tire, and bonded in a butt manner, by stitching with synthetic fibers of a similar material to the carcass, the bulging of the finished tire The purpose of the present invention is to improve appearance quality by preventing phenomena such as dents, dents, and uniformity.

According to the carcass bonding method of the pneumatic tire according to the present invention devised to achieve the object as described above, the step of winding the carcass along the outer surface of the molding drum when molding the pneumatic tire; Bonding the joints that connect both ends of the carcass in a butt manner; It characterized in that it comprises a step of stitching the site where the carcass is bonded with synthetic fibers.

In addition, the synthetic fiber is preferably formed of a material having a strength similar to that of the carcass.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a schematic perspective view showing a state in which the carcass is bonded to the molding drum according to the present invention.

Carcass bonding method of the pneumatic tire according to the present invention, as shown in Figure 3, the step of winding the carcass 14 along the outer surface of the forming drum 20 when molding the pneumatic tire;

Bonding the joints connecting both ends of the carcass 14 in a butt manner;

It comprises a step of stitching the site where the carcass 14 is bonded with a synthetic fiber (30).

Hereinafter, the manufacturing process and carcass bonding method of the pneumatic tire according to the present invention will be briefly described with reference to FIG.

First, each semi-finished product is manufactured for various components constituting the tire, and the semi-finished products include an inner liner, carcass, beads, and sidewalls.

Then, each semi-finished product is wound on the outer surface of the forming drum 20 in turn, and attached using a pressing roll.

Here, when the carcass 14 of the semi-finished products are wound along the outer surface of the forming drum 20, the joint portions connecting both ends of the carcass 14 are bonded by a butt method.

At this time, the joint portion to which both ends of the carcass 14 are bonded is sewn into the synthetic fiber 30. Here, the synthetic fiber 30 is preferably formed of a material having a strength similar to the carcass (14). Although the shape of the synthetic fiber 30 is illustrated in a zigzag manner in the drawings of the present invention, it is possible to firmly sew in various other shapes.

Therefore, through the adhesive method of the carcass 14 as described above, it is possible to prevent phenomena such as bulge, dents, and uniformity, and to improve the appearance quality of the tire.

In addition, the green case is manufactured through a molding process in which a pressing roll is pressed while the carcass 14 is connected to the outer surface of the forming drum 20 to attach the remaining semi-finished products to each other.

Then, the green case is put into the vulcanization mold and subjected to a vulcanization process of applying temperature and pressure to the inside of the green case with a bladder, thereby manufacturing a finished tire.

Although the preferred embodiments of the present invention have been described above, the scope of the present invention is not limited to such specific embodiments, and those skilled in the art may appropriately change within the scope described in the claims of the present invention. This will be possible.

As described above, according to the carcass bonding method of the pneumatic tire according to the present invention, after the pneumatic tire is molded by bonding the both ends of the carcass in a butt manner, the sewn stitch is made of synthetic fibers of a similar material to the carcass. By doing so, there is an effect of preventing appearance such as bulging, dents and uniformity of the finished tire, thereby improving appearance quality.

Claims (2)

Winding the carcass 14 along the outer surface of the forming drum 20 when molding the pneumatic tire; Bonding the joints connecting both ends of the carcass 14 in a butt manner; Stitching the site to which the carcass 14 is bonded with synthetic fibers 30; Carcass bonding method of a pneumatic tire comprising a. The method of claim 1, Carcass bonding method of pneumatic tires, characterized in that the synthetic fiber 30 is formed of a material having a strength similar to the carcass (14).

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