A kind of inner tube and its manufacturing process

Abstract

The invention discloses an inner tube, which comprises an inner tube body, a yarn layer and a rubber layer, the yarn layer is attached to the outer surface of the inner tube body; the rubber layer is attached to the outer surface of the yarn layer , and then through vulcanization treatment, the raw rubber material of the rubber layer penetrates into the yarn gaps of the yarn layer, and the inner tube body, the yarn layer and the rubber layer are integrated. The inner tube of the invention has good bouncing ability, high strength, durability, small circumference error, good balance and stable flight.

Description

technical field [0001] The invention belongs to the technical field of sporting goods, and in particular relates to an inner tube and a manufacturing process thereof. Background technique [0002] Existing sewing ball, such as football and volleyball, its inner tube generally adopts following three structural forms: (1) rubber inner tube; A layer of cloth is pasted outside the inner tube to form a tire in cloth. The defects of the above three structural forms are introduced respectively below: [0003] Defects of the first structure: due to the elasticity of the rubber inner tube, it can expand infinitely and become indeterminate when inflated, and the force of outward expansion directly acts on the shell, making the shell easy to burst, exposing the seam until the final result The ball bursts; secondly, the airtightness of the rubber inner tube is poor, and over time, the sufficient air gradually leaks slowly, and it needs to be refilled frequently, which is inconvenient ...

AI Technical Summary

Problems solved by technology

[0003] Defects of the first structure: due to the elasticity of the rubber inner tube, it can expand infinitely and become indeterminate when inflated, and the force of outward expansion directly acts on the shell, making the shell easy to burst, exposing the seam until the final result The ball bursts; secondly, the airtightness of the rubber inner tube is poor, and over time, the sufficient air gradually leaks slowly, and it needs to be refilled frequently, which is inconvenient to use; thirdly, the air nozzle of the rubber inner tube is on one side, and the air nozzle and its surroundings are glued together A ring of reinforced rubber layer on the rubber inner tube will cause the center of gravity of the whole ball to be on the side of the air nozzle, causing the center of gravity of the ball to be unbalanced and causing flight instability

[0004] Defects of the second structure: wrap a layer of yarn outside the rubber inner tube, use the yarn to restrain the basic circumference of the rubber inner tube, set the shape of the rubber inner tube, and increase the impact damage strength of the ball

However, after the yarn tire is inflated, it will make the ball hard as a whole, and it is easy to hurt your hands when playing.

At the same time, when the ball is inflated harder, it will bring poor balance when the ball is flying in the air. The harder ball not only rebounds poorly, but also makes the player's control over the ball feel worse.

In addition, during the manufacturing process of the yarn tire, the yarn is wound on the rubber inner tube by a machine, and the circumference error of the ball of the yarn tire wound by a machine cannot be guaranteed. Generally, the circumference error will reach 3-5mm. Makes the ball poor in balance, poor in bounce, and unstable in flight

[0005] Defects of the third structure: a layer of cloth is pasted outside the rubber inner tube to form a cloth-in-a-tire, such as a football disclosed in Patent No. 201020150442.1, which includes an outer skin and an inner container, and a cloth is arranged between the outer skin and the inner container.

However, if the patch is used instead of the yarn, the resulting cloth tire has poor shape-setting ability, low impact damage strength of the ball, and large circumferential error, which can reach 3 to 5mm in general, resulting in poor bounce, poor balance, and poor flight performance. Unstable, not strong enough, not durable

[0006] Therefore, the rubber inner tube will continue to expand with the increase of the internal air, and it is impossible to control the sphere to achieve a certain shape and size, which is prone to air leakage problems; although the yarn tire can prevent inflation and explosion to a certain extent, it has the effect of setting the shape, but Because the machine is used to wind the sphere, there is always the defect of uneven yarn winding, and it is impossible to completely control the sphere to achieve a definite shape; similarly, although the tire in the cloth plays a role in setting the shape to a certain extent, due to the warp and weft of the cloth Different wires will lead to uneven tension, so it is impossible to fully control the sphere to achieve a definite spherical shape

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