Ball semi-finished product yarn foaming middle tire and manufacturing method thereof

Abstract

The invention discloses a ball semi-finished product yarn foaming middle tire and a manufacturing method thereof, and belongs to the technical field of ball manufacturing, the ball semi-finished product yarn foaming middle tire sequentially comprises an inner container and a yarn winding layer from inside to outside, the yarn winding layer is composed of yarn with glue, and the yarn winding layer is wound on the surface of the inner container in a cross structure shape. The yarns in the yarn winding layer are provided with glue, so that during yarn winding, the bonding force between the yarns and the surface of the inner container is enough, the yarns can be stably wound on the surface of the inner container, in addition, the multiple layers of yarns of the yarn winding layer have enough bonding strength, the phenomenon that the yarns are scattered in the follow-up processing link is not prone to occurring, and the yarn winding effect is good. The prepared ball has good dynamic stability, the grabbing control capability is improved, in addition, the waterborne polyurethane is arranged in the glue formula, and the waterborne polyurethane material has good environment friendliness, namely, has an environment-friendly effect, does not damage the environment and is suitable for being popularized and used in the field.

Description

Technical Field

[0001] The invention belongs to the technical field of ball manufacturing, and in particular relates to a semi-finished yarn foaming middle tire for a ball and a manufacturing method thereof. Background Art

[0002] With the development of the economy and society, and the awakening of the health awareness of the whole people, the number of people participating in physical exercise in my country is increasing. As a major category of sports, ball sports are becoming more and more popular among people, including basketball, football, volleyball, rugby, etc. In particular, basketball and football are becoming more and more popular in the sports of school students, and corresponding teaching courses have been set up. In order to improve the user experience and better play the technical level of athletes, various new ball products have also appeared. Take basketball as an example: the structure of traditional patch basketball generally includes: outer skin, middle tire (ordinary rubber or foam rubber) layer, yarn and liner from outside to inside; the liner is mainly used for inflation and provides elasticity; winding yarn on the outer surface of the liner can better fix the circumference of the liner and prevent it from deformation. The middle tire (ordinary rubber or foam rubber) layer can easily divide the outer skin layer area, and the outer skin can improve the grip feel. Adhesive inflatable balls (such as basketballs, footballs, volleyballs, rugby, etc.) are generally equipped with inner liner, middle tire and outer shell from inside to outside, as well as air nozzles. The middle tire is located between the inner liner and the outer shell. The middle tire plays a role in control, support and transition. The performance of the middle tire plays an important role in determining the overall performance of the ball.

[0003] The existing ball middle tube undergoes a yarn winding process during processing. During the yarn winding process, the inner liner is first placed on a yarn winding machine, and then the yarn is wound around the inner liner. After the yarn winding is completed, the staff applies glue to the surface of the yarn layer to fix the yarn. However, after the yarn winding is completed, the yarn is usually a cross-layered structure, which makes it difficult for the inner layer (closer to the inner liner) to be dipped in glue. On the one hand, the bonding strength of the yarn layer is insufficient, affecting the firmness of the yarn fixation. On the other hand, during the subsequent processing of the inner liner after the yarn layer is wound, the yarn may fall off the surface of the inner liner or become loose, which will cause the manufactured ball to have insufficient dynamic stability when in use, affecting the grip of the ball. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the prior art and provide a semi-finished yarn foaming tire for balls and a manufacturing method thereof.

[0005] The technical solution adopted to solve the above technical problems is: a semi-finished yarn foaming middle tire for balls, which includes an inner liner and a yarn wrapping layer from the inside to the outside, wherein the yarn wrapping layer is composed of yarn with glue, and the yarn wrapping layer is wound on the surface of the inner liner in a cross structure.

[0006] Through the above technical scheme, the yarn in the winding layer itself has glue, so that when winding the yarn, the bonding force between the yarn and the surface of the inner liner is sufficient, so that the yarn can be stably wound on the surface of the inner liner. In addition, the multiple layers of yarn in the winding layer have sufficient bonding strength, and it is not easy for the yarn to be scattered in the subsequent processing links, thereby making the manufactured ball have good dynamic stability and improved gripping ability.

[0007] Furthermore, the glue comprises the following materials: water-based polyurethane and foaming powder.

[0008] Through the above technical solution, the waterborne polyurethane material has good environmental friendliness, that is, it has environmental protection effects, does not cause damage to the environment, and is suitable for promotion and use in this field.

[0009] A method for making a semi-finished yarn foaming mid-tire for a ball comprises the following steps:

[0010] S1, yarn winding: placing the inner liner on a winding machine, and starting to wind the yarn according to the set tension, speed and angle, the yarn surface has glue, wherein the glue comprises the following materials: the glue comprises water-based polyurethane and foaming powder, the yarn is wound on the surface of the inner liner to form a yarn winding layer, and during the yarn winding process, the foaming powder foams to expand the volume of the inner liner;

[0011] S2. Vulcanization: Place the inner liner with the surface wrapped with yarn in a vulcanization device for vulcanization.

[0012] Through the above technical solution, since the yarn with its own glue is used for yarn winding, the yarn layer after the yarn winding is relatively firm and not easy to loosen.

[0013] Furthermore, the yarns are in a cross structure on the surface of the inner liner.

[0014] Through the above technical scheme, after the yarn is formed into a multi-layer cross structure, the strength of the yarn is improved, and the multi-layer winding layer will increase the deformation resistance of the inner liner, that is, it is equivalent to increasing the thickness of the inner liner. When the ball produced in this way is hit, the yarn of the winding layer also has a certain elasticity, which makes the ball make less noise when hit and the bouncing height of the ball is slightly increased.

[0015] Furthermore, in the vulcanization step, after vulcanization, the vulcanized liner is cooled to room temperature, and excess rubber and yarn on the surface are trimmed.

[0016] Through the above technical solution, after vulcanization, the excess rubber and yarn are cut off, the surface quality of the liner is improved, and the quality of the liner surface is made more uniform, which helps to make the center of gravity of the liner more stable.

[0017] The beneficial effects of the present invention are as follows:

[0018] (1) The yarn in the yarn wrapping layer of the present invention has its own glue, so when the yarn is wrapped, the bonding force between the yarn and the surface of the inner liner is sufficient, so that the yarn can be stably wound on the surface of the inner liner. In addition, the multiple layers of yarn in the yarn wrapping layer have sufficient bonding strength, and it is not easy for the yarn to be scattered in the subsequent processing links, so that the manufactured ball has good dynamic stability and improved gripping ability. In addition, water-based polyurethane is provided in the glue formula. The water-based polyurethane material has good environmental friendliness, that is, it has an environmental protection effect and will not cause damage to the environment, and is suitable for promotion and use in this field;

[0019] (2) After the yarns in the present invention are formed into a multi-layer cross structure, the strength of the yarns is improved, and the multi-layer yarn wrapping layer will increase the deformation resistance of the inner liner, that is, it is equivalent to increasing the thickness of the inner liner. When the balls made in this way are hit, the yarns in the yarn wrapping layer also have a certain elasticity, so that the sound of the balls when hit is smaller, and the bouncing height of the balls is slightly increased;

[0020] (3) In the present invention, after vulcanization, the excess rubber and yarn are cut off to improve the surface quality of the inner liner and make the quality of the inner liner surface more uniform, which helps to make the center of gravity of the inner liner more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic cross-sectional structure diagram of a semi-finished ball yarn foaming tire in the present invention;

[0022] Figure 2 It is a schematic diagram of a method for making a foamed mid-section of a ball semi-finished product yarn according to the present invention;

[0023] Figure 3 It is a schematic flow chart of a method for treating the surface of the inner liner after the vulcanization step in an embodiment of the present invention;

[0024] Figure 4 It is a schematic flow chart of a method for implementing the yarn self-contained glue in an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the structure of the perforating die in the embodiment of the present invention.

[0026] Figure numerals: 1, inner liner; 2, yarn wrapping layer; 3, perforation mold; 301, threading hole; 302, glue storage hopper; 303, mouth. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] like Figure 1-Figure 5 As shown, the present embodiment provides a semi-finished yarn foaming middle tire for balls, which includes an inner liner 1 and a yarn wrapping layer 2 from the inside to the outside, wherein the yarn wrapping layer 2 is composed of yarn with self-contained glue, and the yarn wrapping layer 2 is wound around the surface of the inner liner 1 in a cross structure, and the yarn in the yarn wrapping layer itself carries glue, so that when the yarn is wrapped, the adhesion between the yarn and the surface of the inner liner is sufficient, so that the yarn can be stably wound around the surface of the inner liner, and in addition, the multiple layers of yarn in the yarn wrapping layer have sufficient bonding strength, and it is not easy for the yarn to be scattered in the subsequent processing links, so that the manufactured ball has good dynamic stability and improves the gripping ability, and the glue includes the following materials: water-based polyurethane and foaming powder, and the water-based polyurethane material has good environmental friendliness, that is, it has an environmental protection effect and will not cause damage to the environment, and is suitable for promotion and use in this field. In addition, in the present embodiment, the yarn with self-contained glue can be achieved by the following process:

[0029] Selecting yarn: Selecting yarn made of nylon material, the yarn length is 1500 to 2000 meters, preferably, in this embodiment, the yarn length is 2000 meters;

[0030] Yarn punching: a fixed punching die 3 is used, in which a threading hole 301 for the yarn to pass through is opened, and a glue storage hopper 302 is installed on the top of the punching die 3. The glue storage hopper 302 is filled with glue. The glue material includes water-based polyurethane and foaming powder. The lower port 303 of the glue storage hopper 302 is connected with the threading hole 301, and the yarn end is passed through the threading hole 301;

[0031] Winding and gluing: Use a winding device to wind up the end of the yarn passing through the threading hole 301. During the winding process, the glue in the glue storage bucket 302 penetrates into the threading hole 301 under the action of gravity, and the yarn in the threading hole 301 is dipped in glue, that is, when the yarn passes through the threading hole 301, the glue will adhere to the yarn, so that the yarn surface can carry glue.

[0032] This embodiment also discloses a method for making a semi-finished yarn foaming tire for a ball, comprising the following steps:

[0033] S1. Yarn winding: placing the inner liner 1 on the winding machine, and starting to wind the yarn according to the set tension, speed and angle. The surface of the yarn has glue, wherein the glue includes the following materials: the glue includes water-based polyurethane and foaming powder. The yarn is wound on the surface of the inner liner 1 to form a yarn winding layer 2. During the yarn winding process, the foaming powder foams to expand the volume of the inner liner 1. Since the yarn with glue is used for yarn winding, the yarn layer after yarn winding is relatively firm and not easy to loosen. In addition, in this embodiment, the tension, speed and angle of the winding machine are all current conventional technologies. Those skilled in the art can determine the tension, speed and angle parameters of the above-mentioned winding machine by simply searching in the manual, and no specific restrictions are made here;

[0034] S2, vulcanization: placing the inner liner 1 with the surface wrapped with yarn in a vulcanization device for vulcanization.

[0035] The yarn is in a cross structure on the surface of the inner liner 1, that is, the yarn is wound around the surface of the inner liner 1 for at least 2 turns, so that the yarn forms a multi-layer cross structure on the surface of the inner liner 1, thereby improving the strength of the yarn, which is equivalent to increasing the thickness of the inner liner. When the ball produced in this way is hit, the yarn of the yarn wrapping layer 2 also has a certain elasticity, so that the sound of the ball when hit is smaller, and the bouncing height of the ball is slightly increased (according to the test data, the bouncing height of the ball processed in this embodiment is increased by 0.5-1.0 inches relative to the ball produced by the prior art).

[0036] In addition, after the vulcanization phase of the vulcanization step is completed, the vulcanized liner 1 needs to be cooled to room temperature. The liner 1 can be placed in a cooling channel, and a fan or other conventional equipment can be used to cool the surface of the liner 1. After cooling, when the liner 1 is initially formed, the staff checks the surface of the liner 1 and cuts off the excess rubber and yarn on the surface of the liner 1. In this way, by cutting off the excess rubber and yarn, the surface quality of the liner 1 is improved, and the quality of each part of the surface of the liner 1 is made more uniform, which helps to make the center of gravity of the liner 1 more stable.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A semi-finished yarn foaming tire for balls, characterized in that: It comprises, from the inside to the outside, an inner liner (1) and a yarn wrapping layer (2), wherein the yarn wrapping layer (2) is composed of yarns with glue, and the yarn wrapping layer (2) is wound on the surface of the inner liner (1) in a cross structure.

2. The semi-finished yarn foamed tire for balls according to claim 1, characterized in that: The glue comprises the following materials: water-based polyurethane and foaming powder.

3. A method for making a semi-finished yarn foaming tire for a ball, characterized in that: The steps include: S1, yarn winding: placing the inner liner (1) on a winding machine, and starting to wind the yarn according to the set tension, speed and angle, the yarn surface has glue, wherein the glue comprises the following materials: water-based polyurethane and foaming powder, the yarn is wound on the surface of the inner liner (1) to form a yarn winding layer (2), and during the yarn winding process, the foaming powder foams to expand the volume of the inner liner (1); S2. Vulcanization: placing the inner liner (1) with the surface wrapped with yarn in a vulcanization device for vulcanization.

4. The semi-finished yarn foamed tire for balls according to claim 3, characterized in that: The yarns are in a cross structure on the surface of the inner liner (1).

5. The semi-finished yarn foamed tire for balls according to claim 3, characterized in that: In the vulcanization step, after vulcanization, the vulcanized liner (1) is cooled to room temperature, and excess rubber and yarn on the surface are trimmed.

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