Inner bladder structure for ball

Abstract

A ball inner bladder structure, particularly suitable for a seamless ball, includes a bladder in the form of a spherical bag, a yarn layer enclosing the bladder, an emulsion layer applied over the yarn layer, and a ball cover layer bonded to the emulsion layer. The yarn layer is an integrally knitted web structure having a 3D spherical shape. Knitted yarns subjected to pressure can displace relative to one another to finely adjust a surface configuration of the web structure for the same to completely bear against the bladder. The emulsion layer fills up voids on the yarn layer to provide a smooth spherical surface. The specifically knitted yarn layer can effectively control an expansion degree of the bladder when the same is inflated. And, expansion or compression pressure applied to the bladder is uniformly distributed over interlocking points of knitted yarns, preventing the bladder from deformation and breaking.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an inner bladder structure for seamless ball, and more particularly to a ball inner bladder structure that includes a yarn layer formed in a specific knitting and stitching manner.BACKGROUND OF THE INVENTION[0002]There are various types of balls. Some balls with a relatively simple structure can include a hollow spherical body directly molded using a rubber material. The hollow spherical body inflated with air is swollen to form an elastic ball. For the purpose of providing the balls with required appearance and touch, and of easily distinguishing different types of balls from one another, the balls can further include a multi-layer structure having an inner bladder and an outer cover layer attached to an outer surface of the inner bladder. The inner bladder as a main structure for supporting the ball can be manufactured in many different ways.[0003]In a conventional technique for manufacturing a ball with an inner bladder...

AI Technical Summary

Benefits of technology

[0007]A primary object of the present invention is to provide an improved inner bladder structure for ball. The inner bladder structure includes a yarn layer formed in a specific knitting and stitching manner to effectively control an expansion degree of an inflatable bladder enclosed in the yarn layer. Expansion and compression pressure applied to the bladder is uniformly distributed over interlocking points of knitted yarns, so that the bladder is not easily subject to deformation and breaking.

[0012]In a preferred embodiment, the spherical-shaped knitted fabric includes a plurality of knitting yarns, which are repeatedly bent to form a plurality of loop portions. The loop portions are respectively extended through a loop portion formed by a previous adjacent knitting yarn, and are then respectively extended through by another loop portion formed by a next adjacent knitting yarn, so that a web structure is formed with a void formed in each loop portion and between any two laterally adjacent loop portions. Therefore, when the spherical-shaped knitted fabric is subjected to an external force, the knitting yarns thereof can displace relative to one another to thereby adjust the surface configuration of the spherical-shaped knitted fabric.

[0013]The inner bladder structure for ball according to the present invention is characterized in that the yarn layer is formed in a specific knitting and stitching manner to have few or no seams, so that the yarn layer can effectively control the expansion degree of the bladder when the same is inflated. Moreover, when the bladder is inflated to expand or is compressed under an external force, pressure from such expansion or compression is uniformly distributed over the interlocking points of yarns on the yarn layer, so that the bladder is not easily subject to deformation and breaking.

Problems solved by technology

However, the bonded joints at the overlapped edges of the fabric pieces have relatively weak structural strength, and the bonded fabric layer tends to deform or have separated fabric pieces due to a shearing action.

However, since the yarns are glued to the outer surface of the rubber bladder only by the adhesive coated on the yarns, the wound yarn layer so formed has further reduced tensile strength and shearing strength.

However, the overlapped edges of the fabric pieces are not easily perfectly firmly bonded together at the bonded joints that tend to dislocate or deviated due to a shearing action; and the bonded or the stitched joints have relatively increased thickness to reduce the roundness of the ball so formed.

Images