CN113827931B - Thermoplastic polyurethane ball structure and method of making same - Google Patents

Abstract

The invention provides a thermoplastic polyurethane ball structure and a manufacturing method thereof. The thermoplastic polyurethane ball structure includes: a ball inner bladder layer, a yarn layer and a skin layer, the ball inner bladder layer is made of thermoplastic polyurethane material; the yarn layer is made of thermoplastic polyurethane material, and the yarn layer is made of thermoplastic polyurethane material. The inner bladder layer of the ball is covered; the skin layer is made of thermoplastic polyurethane material, and the skin layer covers the yarn layer. The invention also provides a manufacturing method of the thermoplastic polyurethane ball structure. The thermoplastic polyurethane ball structure of the present invention is all made of thermoplastic polyurethane material, which meets the requirements of environmental protection and can be recycled. In addition, it is not necessary to use an adhesive to bond each layer, so that the peel strength between the layers can be improved, and the overall peel strength of the thermoplastic polyurethane ball structure of the present invention can be improved.

Description

Thermoplastic polyurethane ball structure and manufacturing method thereof

technical field

The invention relates to a thermoplastic polyurethane ball structure and a manufacturing method thereof.

Background technique

The existing football structure is made of materials such as rubber liner, nylon (Nylon) long fiber, ethylene-vinyl acetate copolymer (EVA) foam, etc. However, solvents are used in the existing football manufacturing process, which will harm the environment. Does not meet environmental requirements. Moreover, adhesives are used to bond each layer in the existing soccer ball manufacturing process, and because the materials of each layer are different, the peel strength between the layers is not good, so that the overall peel strength of the existing soccer ball structure is insufficient.

Therefore, it is necessary to provide an innovative and progressive thermoplastic polyurethane ball structure and its manufacturing method to solve the above existing deficiencies.

SUMMARY OF THE INVENTION

The present invention relates to a thermoplastic polyurethane ball structure. In one embodiment, the thermoplastic polyurethane ball structure includes: a ball liner layer, a yarn layer and a skin layer. The inner bladder layer of the ball is made of thermoplastic polyurethane material. The yarn layer is made of thermoplastic polyurethane material, and the yarn layer covers the ball inner bladder layer. The skin layer is made of thermoplastic polyurethane material, and the skin layer covers the yarn layer.

The invention relates to a manufacturing method of a thermoplastic polyurethane spherical structure. In one embodiment, the manufacturing method of the thermoplastic polyurethane ball structure includes the following steps: making a ball liner layer, which is made of thermoplastic polyurethane material; wrapping the ball liner layer with thermoplastic polyurethane yarn to form a yarn The thread layer; making a skin layer, which is made of thermoplastic polyurethane material; and wrapping the skin layer on the yarn layer, and heat processing.

Description of drawings

Fig. 1 is a schematic diagram of the structure of a thermoplastic polyurethane ball according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of the inner bladder layer of the ball according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of an epidermal layer according to an embodiment of the present invention.

Fig. 4 is a schematic flowchart of a manufacturing method of a thermoplastic polyurethane spherical structure according to an embodiment of the present invention.

Fig. 5 is a comparison chart of breaking strength of thermoplastic polyurethane yarns at 10% elongation according to an embodiment of the present invention.

Symbol Description

10 TPU Ball Structure

11 ball liner

12 yarn layers

13 epidermis

111 First High Resilience TPU Layer

112 layers of highly airtight thermoplastic polyurethane

113 Second High Resilience TPU Layer

131 Cortex

132 foam latex layer

133 unfoamed latex layer

S41-S44 steps

Detailed ways

In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

Referring to FIG. 1 , it is a schematic structural diagram of a thermoplastic polyurethane ball structure according to an embodiment of the present invention. In one embodiment, the thermoplastic polyurethane ball structure 10 of the present invention includes: a ball liner layer 11 , a yarn layer 12 and a skin layer 13 . The ball liner layer 11 is made of thermoplastic polyurethane (TPU) material. The yarn layer 12 is made of thermoplastic polyurethane (TPU), and the yarn layer 12 wraps the ball liner layer 11 . The skin layer 13 is made of thermoplastic polyurethane (TPU), and the skin layer 13 covers the yarn layer 12 . The TPU ball structure 10 of the present invention can be applied to various ball games, such as football, but not limited to the above.

In one embodiment, the ball liner layer 11 is wound with long fibers of thermoplastic polyurethane and manufactured by a ball liner process. Referring to FIG. 2 , it is a schematic structural view of the inner bladder layer of the ball according to an embodiment of the present invention. In one embodiment, the ball liner layer 11 includes a first high resilience thermoplastic polyurethane layer 111 , a high airtight thermoplastic polyurethane layer 112 and a second high resilience thermoplastic polyurethane layer 113 . The high airtight thermoplastic polyurethane layer 112 is disposed on the second high resilience thermoplastic polyurethane layer 113 , and the first high resilience thermoplastic polyurethane layer 111 is disposed on the high airtight thermoplastic polyurethane layer 112 . The composite thickness ratio of the first high resilience thermoplastic polyurethane layer 111 , the high airtight thermoplastic polyurethane layer 112 and the second high resilience thermoplastic polyurethane layer 113 is 1:2:1. In one embodiment, the thickness of the first high resilience thermoplastic polyurethane layer 111 may be 0.05 mm, the thickness of the high airtight thermoplastic polyurethane layer 112 may be 0.1 mm, and the thickness of the second high resilience thermoplastic polyurethane layer 113 may be Can be 0.05mm.

In one embodiment, the yarn layer 12 is made of thermoplastic polyurethane wrapping yarn or thermoplastic polyurethane hot-melt yarn. The thermoplastic polyurethane winding yarn or thermoplastic polyurethane hot-melt yarn can be thermoplastic polyurethane elastomer. The yarn layer 12 can be thermally processed to fuse and bond the inner bladder layer 11 and the skin layer 13 .

Referring to FIG. 3 , it is a schematic structural diagram of an epidermal layer according to an embodiment of the present invention. In one embodiment, the skin layer 13 includes a skin layer 131 and a latex layer. The latex layer includes a foamed latex layer 132 and an unfoamed latex layer 133 , the foamed latex layer 132 is disposed on the unfoamed latex layer 133 , and the skin layer 131 is disposed on the foamed latex layer 132 . The composite thickness ratio of the skin layer 131 , the foamed latex layer 132 and the unfoamed latex layer 133 is 1:8:1. In one embodiment, the thickness of the skin layer 131 is 0.1-0.3 mm, the thickness of the foamed latex layer 132 is 0.4-1.6 mm, and the thickness of the unfoamed latex layer 133 is 0.1-0.3 mm. In one embodiment, the thickness of the skin layer 131 may be 0.2 mm, the thickness of the foamed latex layer 132 may be 1.6 mm, and the thickness of the unfoamed latex layer 133 may be 0.2 mm.

The thermoplastic polyurethane ball structure 10 of the present invention is entirely made of thermoplastic polyurethane material, meets environmental protection requirements and is recyclable, does not need to use any solvent, and will not harm the environment. Moreover, each layer of the thermoplastic polyurethane ball structure 10 of the present invention is made of the same thermoplastic polyurethane material, and there is no need to use an adhesive to bond the layers. The thermoplastic polyurethane ball structure 10 of the present invention can be used to melt and bond each layer, which can improve the performance of each layer. The peeling strength between the layers is improved, and the overall peeling strength of the thermoplastic polyurethane ball structure 10 of the present invention is improved.

Referring to FIG. 4 , it is a schematic flowchart of a manufacturing method of a thermoplastic polyurethane ball structure according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 4 , and first refer to step S41 to manufacture the ball liner 11 , which is made of thermoplastic polyurethane material. In one embodiment, the step of making the inner liner layer of the ball includes: preparing thermoplastic polyurethane pellets with a viscosity of 0.5-2, and drying them through a drying cylinder so that the moisture content of the thermoplastic polyurethane pellets is 20-50ppm During the process, a melt-spinning process is used to transport the dried thermoplastic polyurethane ester pellets to an extruder, and after melting, it is transported to a metering pump, and is transported to a spinning assembly through the metering pump to eject thermoplastic polyurethane filaments. , and then cooled by cooling air with a temperature of 10-50°C, stretched with a drawing roller, and wound with a winder to produce 200-500den thermoplastic polyurethane The long fibers are subjected to a ball liner process to obtain the ball liner layer 11.

In one embodiment, the physical properties of the thermoplastic polyurethane long fibers are 5-15 g/d, the 10% initial strength is 0.5-1.5 kgf, and the elongation is 5-30%.

Please cooperate with reference to Fig. 1, Fig. 2 and Fig. 4, in one embodiment, in the step of making this ball liner layer 11, comprise: make a first high resilience thermoplastic polyurethane layer 111, a high airtight thermoplastic polyurethane Layer 112 and a second high-resilience thermoplastic polyurethane layer 113, wherein the thermoplastic polyurethane particles are dried with a first dryer so that the moisture content is below 300 ppm, and the thermoplastic polyurethane ester is melted with a first extruder The melting temperature of the first extruder is 160°C-180°C. In one embodiment, the melting temperature of the first extruder is set to 160°C, 180°C, and 175°C in sequence. The DIE temperature is 180° C., and the first high-resilience thermoplastic polyurethane layer 111 is produced by a first metering pump.

In one embodiment, the thermoplastic polyurethane pellets are dried with a second dryer so that the moisture content is below 300 ppm, and the thermoplastic polyurethane pellets are melted using a second extruder. The melting temperature of the second extruder is 160°C-190°C. In one embodiment, the melting temperature of the second extruder is set to 160°C, 190°C, and 180°C in sequence. The temperature of DIE is 180° C., and the high-airtight thermoplastic polyurethane layer 112 is produced by a second metering pump.

In one embodiment, a third dryer is used to dry the thermoplastic polyurethane pellets so that the moisture content is below 300 ppm, and a third extruder is used to melt the thermoplastic polyurethane pellets. The melting temperature of the third extruder is 160°C-180°C. In one embodiment, the melting temperature of the third extruder is set to 160°C, 180°C, and 175°C in sequence. The DIE temperature is 180° C., and the second high resilience thermoplastic polyurethane layer 113 is produced by a third metering pump.

The high-airtight thermoplastic polyurethane layer 112 is arranged on the second high-resilience thermoplastic polyurethane layer 113 by using a first coating wheel to cool and form a film, and the first high-resilience thermoplastic polyurethane layer 111 is arranged on the high-airtight thermoplastic polyurethane layer 113 layer 112. The composite thickness ratio of the first high resilience thermoplastic polyurethane layer 111 , the high airtight thermoplastic polyurethane layer 112 and the second high resilience thermoplastic polyurethane layer 113 is 1:2:1. In one embodiment, the speed of the first coating wheel is 4.0m/min, so as to make the ball liner layer 11 with a total thickness of 0.2mm, the thickness of the first high-resilience thermoplastic polyurethane layer 111 can be 0.05 mm, the thickness of the high airtight thermoplastic polyurethane layer 112 may be 0.1 mm, and the thickness of the second high resilience thermoplastic polyurethane layer 113 may be 0.05 mm. The test data are shown in Table 1 below:

Table 1

Please refer to FIG. 1 and FIG. 4 , and refer to step S42 , wrapping the ball liner layer 11 with thermoplastic polyurethane yarn to form a yarn layer 12 . In one embodiment, the thermoplastic polyurethane yarn is wound to wrap the inner bladder layer 11 to form the yarn layer 12 . Please refer to the following comparison graph of breaking strength at 10% elongation (Figure 5), which shows the comparison of the existing nylon (NYLON 66220D) yarn and the thermoplastic polyurethane yarn (HT-F 210D) of the present invention, obviously, The breaking strength of the thermoplastic polyurethane yarn (HT-F 210D) of the present invention in each tensile test is higher than that of the existing nylon (NYLON 66 220D) yarn. And each breaking strength is more average.

Please refer to FIG. 1 , FIG. 3 and FIG. 4 , and refer to step S43 to make a skin layer 13 made of thermoplastic polyurethane material. In one embodiment, the step of making the skin layer 13 includes: making a skin layer 131, a foamed latex layer 132 and an unfoamed latex layer 133, wherein Shore hardness 80-90A, For thermoplastic polyurethane particles with a melting point of 140-160° C., the thermoplastic polyurethane particles are dried with a fourth dryer to keep the moisture content below 300 ppm. And use a fourth extruder to melt the thermoplastic polyurethane ester pellets, the melting temperature of the fourth extruder is 185°C-200°C, in one embodiment, the melting temperature of the fourth extruder is set in order It is 185°C, 200°C, and 195°C. The DIE temperature is 185° C., and the skin layer 131 is made by a fourth metering pump.

In one embodiment, TPU particles having a Shore hardness of 60-85A and a melting point of 120-140° C. are used to dry the TPU particles with a fifth dryer to keep the moisture content below 300 ppm. And use a fifth extruder to melt the thermoplastic polyurethane pellets, and add 0.5-5.0% microsphere foaming agent, the melting temperature of the fifth extruder is 160°C-190°C, in one embodiment, the The melt temperature settings of the fifth extruder were 160°C, 190°C, 185°C in sequence. The DIE temperature is 185° C., and the foamed latex layer 132 is produced through a fifth metering pump.

In one embodiment, thermoplastic polyurethane particles with a Shore hardness of 60-85A and a melting point of 90-130°C are used to dry the thermoplastic polyurethane particles with a sixth dryer so that the moisture content is below 300ppm, and then the thermoplastic polyurethane particles are dried by a sixth extrusion machine. Melt the thermoplastic polyurethane pellets out of the extruder. The melting temperature of the sixth extruder is 160°C-180°C. In one embodiment, the melting temperature of the sixth extruder is set at 160°C and 180°C in sequence. , 170°C. The DIE temperature is 185° C., and the unfoamed latex layer 133 is produced through a sixth metering pump.

In one embodiment, the foamed latex layer 132 is disposed on the unfoamed latex layer 133 , and the outer skin layer 131 is disposed on the foamed latex layer 132 by using a second laminating wheel to cool and form a film. The composite thickness ratio of the skin layer 131 , the foamed latex layer 132 and the unfoamed latex layer 133 is 1:8:1. In one embodiment, the speed of the second laminating wheel is 4.0m/min, so as to make the skin layer 13 with a total thickness of 2.0mm, the thickness of the skin layer 131 can be 0.2mm, and the foamed latex layer The thickness of 132 may be 1.6 mm, and the thickness of the unfoamed latex layer 133 may be 0.2 mm. In one embodiment, the thickness of the skin layer 131 is 0.1-0.3 mm, the thickness of the foamed latex layer 132 is 0.4-1.6 mm, and the thickness of the unfoamed latex layer 133 is 0.1-0.3 mm.

Please refer to FIG. 1 and FIG. 4 , and refer to step S44 , wrapping the skin layer 13 on the yarn layer 12 and performing thermal processing. In one embodiment, the yarn layer 12 can fuse the inner bladder layer 11 and the skin layer 13 by heat treatment.

In one embodiment, the manufacturing method of the present invention further includes a step of pressing the transferred texture, using a cold mold to transfer the texture to the outer skin layer 131 .

The manufacturing method of the thermoplastic polyurethane spherical structure 10 of the present invention is made entirely of thermoplastic polyurethane material, which meets the requirement of environmental protection and is recyclable, and the above manufacturing method does not need to use any solvent and will not harm the environment. Moreover, each layer of the thermoplastic polyurethane ball structure 10 of the present invention is made of the same thermoplastic polyurethane material, and there is no need to use an adhesive to bond the layers. The manufacturing method of the thermoplastic polyurethane ball structure 10 of the present invention uses fusion bonding of each layer to improve the performance of each layer. The peeling strength between the layers is improved, and the overall peeling strength of the thermoplastic polyurethane ball structure 10 of the present invention is improved.

The above-mentioned embodiments are only to illustrate the principles and effects of the present invention, but not to limit the present invention. Modifications and changes made to the above-mentioned embodiments by those skilled in the art still do not violate the spirit of the present invention. The scope of rights of the present invention should be listed in the claims.

Claims (7)

1. A thermoplastic polyurethane ball structure comprising:

the ball inner container layer is made of thermoplastic polyurethane material;

the yarn layer is made of thermoplastic polyurethane material and covers the ball liner layer; and

the surface layer is made of thermoplastic polyurethane material and wraps the yarn layer;

wherein, the epidermal layer includes an ectoderm and a emulsion layer, the emulsion layer includes a foaming emulsion layer and a not foaming emulsion layer, the foaming emulsion layer set up in on the not foaming emulsion layer, the ectoderm set up in on the foaming emulsion layer, the ectoderm the foaming emulsion layer reaches the thickness complex of not foaming emulsion layer compares 1:8:1, the thickness of the outer skin layer is 0.1-0.3mm, the thickness of the foamed latex layer is 0.4-1.6mm, and the thickness of the unfoamed latex layer is 0.1-0.3mm; the ball inner bag layer includes that a first high resilience thermoplasticity polyurethane layer, a high airtight thermoplasticity polyurethane layer and the high resilience thermoplasticity polyurethane layer of second kick-back, high airtight thermoplasticity polyurethane layer sets up on the high resilience thermoplasticity polyurethane layer of second, first high resilience thermoplasticity polyurethane layer set up in on the high airtight thermoplasticity polyurethane layer, first high resilience thermoplasticity polyurethane layer high airtight thermoplasticity polyurethane layer reaches the thickness complex ratio on the high resilience thermoplasticity polyurethane layer of second is 1:2:1;

the manufacturing method of the thermoplastic polyurethane ball structure comprises the following steps:

manufacturing a ball inner container layer which is made of thermoplastic polyurethane material;

covering the ball inner container layer with thermoplastic polyurethane yarns to form a yarn layer;

manufacturing a surface layer which is made of thermoplastic polyurethane material; and

wrapping the surface layer with the yarn layer, and carrying out thermal processing treatment;

wherein, in the step of manufacturing the ball inner container layer, the method comprises the following steps: a step of producing a first high resilience thermoplastic polyurethane layer, a high airtight thermoplastic polyurethane layer and a second high resilience thermoplastic polyurethane layer, wherein thermoplastic polyurethane particles are dried by a first dryer to have a water content of 300ppm or less, and thermoplastic polyurethane particles are melted by a first extruder at a melting temperature of 160 ℃ to 180 ℃ and a DIE temperature of 180 ℃ to produce the first high resilience thermoplastic polyurethane layer by a first metering pump; drying the thermoplastic polyurethane particles by a second dryer to enable the water content to be below 300ppm, melting the thermoplastic polyurethane particles by a second extruder, wherein the melting temperature of the second extruder is 160-190 ℃, the DIE temperature is 180 ℃, and the high-airtightness thermoplastic polyurethane layer is manufactured by a second metering pump; drying the thermoplastic polyurethane particles by a third dryer to enable the water content to be below 300ppm, melting the thermoplastic polyurethane particles by a third extruder, wherein the melting temperature of the third extruder is 160-180 ℃, the DIE temperature is 180 ℃, and the second high-resilience thermoplastic polyurethane layer is manufactured by a third metering pump; utilizing a first film laminating wheel to cool and form a film so that the high-airtightness thermoplastic polyurethane layer is arranged on a second high-resilience thermoplastic polyurethane layer, the first high-resilience thermoplastic polyurethane layer is arranged on the high-airtightness thermoplastic polyurethane layer, and the thickness composite ratio of the first high-resilience thermoplastic polyurethane layer, the high-airtightness thermoplastic polyurethane layer and the second high-resilience thermoplastic polyurethane layer is 1:2:1.

2. a thermoplastic polyurethane ball structure comprising:

the ball inner container layer is made of thermoplastic polyurethane material;

the yarn layer is made of thermoplastic polyurethane material and covers the ball liner layer; and

the surface layer is made of thermoplastic polyurethane material and wraps the yarn layer;

wherein, the epidermal layer includes an ectoderm and a emulsion layer, the emulsion layer includes a foaming emulsion layer and a not foaming emulsion layer, the foaming emulsion layer set up in on the not foaming emulsion layer, the ectoderm set up in on the foaming emulsion layer, the ectoderm the foaming emulsion layer reaches the thickness complex of not foaming emulsion layer compares 1:8:1, the thickness of the outer skin layer is 0.1-0.3mm, the thickness of the foamed latex layer is 0.4-1.6mm, and the thickness of the unfoamed latex layer is 0.1-0.3mm; the ball inner bag layer includes that a first high resilience thermoplasticity polyurethane layer, a high airtight thermoplasticity polyurethane layer and the high resilience thermoplasticity polyurethane layer of second kick-back, high airtight thermoplasticity polyurethane layer sets up on the high resilience thermoplasticity polyurethane layer of second, first high resilience thermoplasticity polyurethane layer set up in on the high airtight thermoplasticity polyurethane layer, first high resilience thermoplasticity polyurethane layer high airtight thermoplasticity polyurethane layer reaches the thickness complex ratio on the high resilience thermoplasticity polyurethane layer of second is 1:2:1;

the manufacturing method of the thermoplastic polyurethane ball structure comprises the following steps:

manufacturing a ball inner container layer which is made of thermoplastic polyurethane material;

covering the ball inner container layer with thermoplastic polyurethane yarns to form a yarn layer;

manufacturing a surface layer which is made of thermoplastic polyurethane material; and

wrapping the surface layer with the yarn layer, and carrying out thermal processing treatment;

wherein the step of forming the skin layer comprises: a step of manufacturing an outer skin layer, a foamed latex layer and an unfoamed latex layer, wherein thermoplastic polyurethane particles are dried by a fourth dryer to make the water content below 300ppm, and the thermoplastic polyurethane particles are melted by a fourth extruder, the melting temperature of the fourth extruder is 185-200 ℃, the DIE temperature is 185 ℃, and the outer skin layer is manufactured by a fourth metering pump; drying the thermoplastic polyurethane particles by a fifth dryer to enable the water content to be below 300ppm, melting the thermoplastic polyurethane particles by a fifth extruder, adding 0.5-5.0% of microsphere foaming agent, wherein the melting temperature of the fifth extruder is 160-190 ℃, the DIE temperature is 185 ℃, and passing through a fifth metering pump to manufacture the foamed latex layer; drying the thermoplastic polyurethane particles by a sixth dryer to enable the water content to be below 300ppm, melting the thermoplastic polyurethane particles by a sixth extruder, wherein the melting temperature of the sixth extruder is 160-180 ℃, the DIE temperature is 185 ℃, and passing through a sixth metering pump to manufacture the unfoamed latex layer; utilizing a second film spraying wheel to cool and form a film, so that the foamed latex layer is arranged on the unfoamed latex layer, the outer skin layer is arranged on the foamed latex layer, the thickness of the outer skin layer is 0.1-0.3mm, the thickness of the foamed latex layer is 0.4-1.6mm, the thickness of the unfoamed latex layer is 0.1-0.3mm, and the thickness composite ratio of the outer skin layer, the foamed latex layer and the unfoamed latex layer is 1:8:1.

3. a thermoplastic polyurethane ball structure as in claim 1 or 2, wherein the yarn layer is wrapped around the ball bladder layer.

4. A thermoplastic polyurethane ball structure according to claim 1 or 2, wherein the yarn layer is made of a thermoplastic polyurethane wrap yarn or a thermoplastic polyurethane hot melt yarn.

5. A method of making a thermoplastic polyurethane ball structure comprising the steps of:

manufacturing a ball inner container layer which is made of thermoplastic polyurethane material;

covering the ball inner container layer with thermoplastic polyurethane yarns to form a yarn layer;

manufacturing a surface layer which is made of thermoplastic polyurethane material; and

wrapping the surface layer with the yarn layer and carrying out thermal processing treatment;

wherein, in the step of manufacturing the ball inner container layer, the method comprises the following steps: a step of producing a first high resilience thermoplastic polyurethane layer, a high airtight thermoplastic polyurethane layer and a second high resilience thermoplastic polyurethane layer, wherein thermoplastic polyurethane particles are dried by a first dryer to have a water content of 300ppm or less, and thermoplastic polyurethane particles are melted by a first extruder at a melting temperature of 160 ℃ to 180 ℃ and a DIE temperature of 180 ℃ to produce the first high resilience thermoplastic polyurethane layer by a first metering pump; drying the thermoplastic polyurethane particles by a second dryer to enable the water content to be below 300ppm, melting the thermoplastic polyurethane particles by a second extruder, wherein the melting temperature of the second extruder is 160-190 ℃, the DIE temperature is 180 ℃, and passing through a second metering pump to manufacture the high-airtight thermoplastic polyurethane layer; drying the thermoplastic polyurethane particles by a third dryer to enable the water content to be below 300ppm, melting the thermoplastic polyurethane particles by a third extruder, wherein the melting temperature of the third extruder is 160-180 ℃, the DIE temperature is 180 ℃, and passing through a third metering pump to manufacture the second high-resilience thermoplastic polyurethane layer; utilizing a first film laminating wheel to cool and form a film so that the high-airtightness thermoplastic polyurethane layer is arranged on a second high-resilience thermoplastic polyurethane layer, the first high-resilience thermoplastic polyurethane layer is arranged on the high-airtightness thermoplastic polyurethane layer, and the thickness composite ratio of the first high-resilience thermoplastic polyurethane layer, the high-airtightness thermoplastic polyurethane layer and the second high-resilience thermoplastic polyurethane layer is 1:2:1.

6. a method of making a thermoplastic polyurethane ball structure comprising the steps of:

manufacturing a ball inner container layer which is made of thermoplastic polyurethane material;

covering the ball liner layer with thermoplastic polyurethane yarn to form a yarn layer;

manufacturing a surface layer which is made of thermoplastic polyurethane material; and

wrapping the surface layer with the yarn layer, and carrying out thermal processing treatment;

wherein the step of forming the skin layer comprises: a step of manufacturing an outer skin layer, a foamed latex layer and an unfoamed latex layer, wherein thermoplastic polyurethane particles are dried by a fourth dryer to make the water content below 300ppm, and the thermoplastic polyurethane particles are melted by a fourth extruder, the melting temperature of the fourth extruder is 185-200 ℃, the DIE temperature is 185 ℃, and the outer skin layer is manufactured by a fourth metering pump; drying the thermoplastic polyurethane particles by a fifth dryer to enable the water content to be below 300ppm, melting the thermoplastic polyurethane particles by a fifth extruder, adding 0.5-5.0% of a microsphere foaming agent, wherein the melting temperature of the fifth extruder is 160-190 ℃, the DIE temperature is 185 ℃, and passing through a fifth metering pump to manufacture the foamed latex layer; drying the thermoplastic polyurethane particles by a sixth dryer to enable the water content to be below 300ppm, melting the thermoplastic polyurethane particles by a sixth extruder, wherein the melting temperature of the sixth extruder is 160-180 ℃, the DIE temperature is 185 ℃, and passing through a sixth metering pump to manufacture the unfoamed latex layer; utilizing a second film spraying wheel to cool and form a film, so that the foamed latex layer is arranged on the unfoamed latex layer, the outer skin layer is arranged on the foamed latex layer, the thickness of the outer skin layer is 0.1-0.3mm, the thickness of the foamed latex layer is 0.4-1.6mm, the thickness of the unfoamed latex layer is 0.1-0.3mm, and the thickness composite ratio of the outer skin layer, the foamed latex layer and the unfoamed latex layer is 1:8:1.

7. a method of manufacturing a thermoplastic polyurethane ball structure of claim 5 or 6, wherein the step of manufacturing the ball bladder layer comprises: preparing thermoplastic polyurethane granules with the viscosity of 0.5-2, drying the thermoplastic polyurethane granules by a drying cylinder to ensure that the water content of the thermoplastic polyurethane granules is between 20 and 50ppm, conveying the dried thermoplastic polyurethane granules into an extruder by using a melt spinning process, melting the thermoplastic polyurethane granules, conveying the thermoplastic polyurethane granules to a metering pump by the metering pump, spraying thermoplastic polyurethane filaments by the metering pump, cooling the thermoplastic polyurethane filaments by cooling air with the air temperature of 10-50 ℃, extending by an extending roller device, winding by a winding machine to prepare 200-500den thermoplastic polyurethane long fibers, and performing a ball liner process to prepare the ball liner layer.

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