Sewn ball and making process thereof

Abstract

The invention discloses a sewn ball which comprises an inner tube and an outer shell. The inner tube 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. Then sulfidizing is carried out, raw rubber materials of the rubber layer permeate to yarn clearances of the yarn layer, the inner tube body, the yarn layer and the rubber layer are integrated, and the outer shell wraps and is attached to the inner tube. The sewn ball is good in leaping ability, high in strength, durable, small in circumference error, good in balance and stable in flying.

Description

technical field [0001] The invention belongs to the technical field of sporting goods, in particular to a sewing ball and a manufacturing process thereof. Background technique [0002] Existing sewing balls, such as sewing footballs and sewing volleyballs, generally adopt the following three structural forms in their inner tubes: (1) rubber inner tubes; (2) wrapping a layer of yarn outside the rubber inner tubes to form yarn tires; 3) Paste a layer of cloth on the outside of the rubber inner tire to form a cloth inner tire. 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 ov...

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 outer shell, making the outer shell easy to burst, exposing the seam line until the final result The ball bursts; secondly, the airtightness of the rubber inner tube is poor, and over time, sufficient air gradually leaks slowly, requiring frequent refilling, which is inconvenient to use; thirdly, the air nozzle of the rubber inner tube is on one side, and the air nozzle and the periphery of the air nozzle are glued to the 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.

Although this patent reduces the number of bonding or sewing leather pieces, it also reduces the difficulty of bonding or sewing, and improves the precision of bonding or sewing; The length of the piece and the three-piece leather piece is long, and there is often a waste of raw material punching. If this type of football is put into production on a large scale, it will cause a lot of waste of raw materials and increase the cost of raw material input.

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