CN113827931A - Thermoplastic polyurethane ball structure and method of making same - Google Patents
Thermoplastic polyurethane ball structure and method of making same Download PDFInfo
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- CN113827931A CN113827931A CN202010510735.4A CN202010510735A CN113827931A CN 113827931 A CN113827931 A CN 113827931A CN 202010510735 A CN202010510735 A CN 202010510735A CN 113827931 A CN113827931 A CN 113827931A
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B41/00—Hollow inflatable balls
- A63B41/02—Bladders
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B41/00—Hollow inflatable balls
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B41/00—Hollow inflatable balls
- A63B41/08—Ball covers; Closures therefor
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B45/00—Apparatus or methods for manufacturing balls
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- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
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Abstract
The invention provides a thermoplastic polyurethane ball structure and a manufacturing method thereof. The thermoplastic polyurethane ball structure comprises: the ball liner layer is made of a thermoplastic polyurethane material; the yarn layer is made of thermoplastic polyurethane material and wraps the ball liner layer; the surface layer is made of thermoplastic polyurethane material, and the surface layer covers the yarn layer. The invention also provides a manufacturing method of the thermoplastic polyurethane ball structure. The thermoplastic polyurethane ball structure is made of thermoplastic polyurethane materials, meets the requirement of environmental protection and can be recycled. In addition, the layers do not need to be bonded by using an adhesive, so that the peeling strength between the layers can be improved, and the integral peeling strength of the thermoplastic polyurethane ball structure is improved.
Description
Technical Field
The invention relates to a thermoplastic polyurethane ball structure and a manufacturing method thereof.
Background
The prior football structure is made of materials such as a rubber liner, Nylon (Nylon) long fiber, ethylene-vinyl acetate copolymer (EVA) foam and the like, however, a solvent is needed in the prior football making process, and the solvent can harm the environment and does not meet the requirement of environmental protection. Moreover, in the existing football manufacturing process, the layers need to be bonded by using an adhesive, and because the materials of the layers are different, the peel strength between the layers is poor, so that the overall peel strength of the existing football structure is insufficient.
Therefore, there is a need to provide an innovative and advanced thermoplastic polyurethane ball structure and a manufacturing method thereof to solve the above-mentioned existing disadvantages.
Disclosure of Invention
The invention relates to a thermoplastic polyurethane ball structure. In one embodiment, the thermoplastic polyurethane ball structure comprises: a ball liner layer, a yarn layer and a surface layer. The ball inner container layer is made of thermoplastic polyurethane material. The yarn layer is made of thermoplastic polyurethane materials, and the yarn layer covers the ball inner container layer. The skin layer is made of thermoplastic polyurethane materials, and the yarn layer is wrapped by the skin layer.
The invention relates to a method for manufacturing a thermoplastic polyurethane ball structure. In one embodiment, the method of making the thermoplastic polyurethane ball structure comprises 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 covering the surface layer with the yarn layer and carrying out heat treatment.
Drawings
FIG. 1 is a schematic diagram of the structure of a thermoplastic polyurethane ball according to one embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a ball liner layer according to an embodiment of the invention.
FIG. 3 is a schematic structural diagram of a skin layer according to an embodiment of the present invention.
FIG. 4 is a flow chart of a method for manufacturing a thermoplastic polyurethane ball structure according to an embodiment of the present invention.
FIG. 5 is a graph comparing the breaking strength at 10% elongation of thermoplastic polyurethane yarns according to one embodiment of the present invention.
Description of the symbols
10 thermoplastic polyurethane ball structure
11 ball inner container layer
12 layers of yarn
13 epidermal layer
111 first high resilience thermoplastic polyurethane layer
112 highly gas-tight thermoplastic polyurethane layer
113 second high resilience thermoplastic polyurethane layer
131 outer skin layer
132 foamed latex layer
133 unfoamed latex layer
S41-S44 steps
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a thermoplastic polyurethane ball structure according to an embodiment of the present invention is shown. In one embodiment, the thermoplastic polyurethane ball structure 10 of the present invention comprises: a ball bladder 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) material, and the yarn layer 12 covers the ball liner layer 11. The skin layer 13 is made of Thermoplastic Polyurethane (TPU) material, and the yarn layer 12 is covered by the skin layer 13. The thermoplastic polyurethane ball structure 10 of the present invention can be applied to various balls such as soccer balls, etc., but is not limited thereto.
In one embodiment, the ball bladder layer 11 is made by winding thermoplastic polyurethane filament and using a ball bladder process. Fig. 2 is a schematic structural diagram of a ball liner layer according to an embodiment of the invention. In one embodiment, the inner bladder 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 gas-tight 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 gas-tight thermoplastic polyurethane layer 112. The thickness composite 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 0.05mm, the thickness of the high airtight thermoplastic polyurethane layer 112 may be 0.1mm, and the thickness of the second high resilience thermoplastic polyurethane layer 113 may be 0.05 mm.
In one embodiment, the yarn layer 12 is formed from a wrapped yarn of thermoplastic polyurethane or a hot melt yarn of thermoplastic polyurethane. The thermoplastic polyurethane wrap yarn or thermoplastic polyurethane hot melt yarn may be a thermoplastic polyurethane elastomer. The yarn layer 12 may be heat treated to melt bond the bladder layer 11 and the skin layer 13.
Fig. 3 is a schematic structural diagram of the epidermis layer according to an embodiment of the present invention. In one embodiment, the skin layer 13 includes an outer skin layer 131 and a latex layer. The latex layer comprises a foamed latex layer 132 and an unfoamed latex layer 133, the foamed latex layer 132 is arranged on the unfoamed latex layer 133, and the outer skin layer 131 is arranged on the foamed latex layer 132. The thickness composite ratio of the outer skin layer 131, the foamed latex layer 132 and the unfoamed latex layer 133 is 1: 8: 1. in one embodiment, the outer skin layer 131 has a thickness of 0.1-0.3mm, the foamed latex layer 132 has a thickness of 0.4-1.6mm, and the unfoamed latex layer 133 has a thickness of 0.1-0.3 mm. In one embodiment, the thickness of the outer skin layer 131 may be 0.2mm, the thickness of the foamed latex layer 132 may be 1.6mm, 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 made entirely of thermoplastic polyurethane material, meets the environmental protection requirements, is recyclable, does not require any solvent, and does 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 it is not necessary to bond each layer with an adhesive, and the thermoplastic polyurethane ball structure 10 of the present invention can bond each layer by melting, which can improve the peel strength between each layer, and improve the overall peel strength of the thermoplastic polyurethane ball structure 10 of the present invention.
Referring to fig. 4, a flow chart of a manufacturing method of the thermoplastic polyurethane ball structure according to an embodiment of the invention is shown. Referring to fig. 1 and 4, first, in step S41, the ball bladder layer 11 is made of thermoplastic polyurethane. In one embodiment, the step of fabricating the ball liner layer includes: preparing thermoplastic polyurethane particles with the viscosity of 0.5-2, drying the thermoplastic polyurethane particles through a drying cylinder to enable the water content of the thermoplastic polyurethane particles to be 20-50ppm, using a melt spinning process to convey the dried thermoplastic polyurethane particles into an extruder, melting the thermoplastic polyurethane particles, conveying the thermoplastic polyurethane particles to a metering pump, conveying the thermoplastic polyurethane particles to a spinning assembly through the metering pump to spray thermoplastic polyurethane filaments, cooling the thermoplastic polyurethane filaments through cooling air with the air temperature of 10-50 ℃, extending the thermoplastic polyurethane filaments through a Drawing rollers device, winding the thermoplastic polyurethane filaments through a Winder (windder) to obtain 200-500den thermoplastic polyurethane long fibers, and using a ball liner process to obtain the ball liner layer 11.
In one embodiment, the thermoplastic polyurethane long fiber has physical properties of 5 to 15g/d, 10% initial strength of 0.5 to 1.5kgf, and elongation of 5 to 30%.
Referring to fig. 1, fig. 2 and fig. 4, in an embodiment, the step of manufacturing the ball liner layer 11 includes: a step of manufacturing a first high resilience thermoplastic polyurethane layer 111, a highly airtight thermoplastic polyurethane layer 112 and a second high resilience thermoplastic polyurethane layer 113, in which thermoplastic polyurethane particles are dried with a first dryer to have a water content of 300ppm or less, and the thermoplastic polyurethane particles are melted with a first extruder having a melting temperature of 160 ℃ to 180 ℃, in one embodiment, the melting temperature of the first extruder is set to 160 ℃, 180 ℃ and 175 ℃ in this order. The DIE temperature is 180 ℃ and the first high resilience thermoplastic polyurethane layer 111 is produced by a first metering pump.
In one embodiment, the thermoplastic polyurethane particles are dried with a second dryer to a water content of 300ppm or less, and the thermoplastic polyurethane particles are melted by a second extruder having a melting temperature of 160 ℃ to 190 ℃, and in one embodiment, the melting temperature of the second extruder is set to 160 ℃, 190 ℃, 180 ℃ in this order. The DIE temperature is 180 ℃ and a second metering pump is used to produce the highly airtight thermoplastic polyurethane layer 112.
In one embodiment, the thermoplastic polyurethane particles are dried to a water content of 300ppm or less by a third dryer, and the thermoplastic polyurethane particles are melted by a third extruder having a melting temperature of 160 ℃ to 180 ℃, and in one embodiment, the melting temperature of the third extruder is set to 160 ℃, 180 ℃, and 175 ℃ in this order. The DIE temperature is 180 ℃ and passes through a third metering pump to make the second high resilience thermoplastic polyurethane layer 113.
The high-air-tightness thermoplastic polyurethane layer 112 is arranged on the second high-resilience thermoplastic polyurethane layer 113 by a first film laminating wheel cooling film, and the first high-resilience thermoplastic polyurethane layer 111 is arranged on the high-air-tightness thermoplastic polyurethane layer 112. The thickness composite 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 first lamination wheel speed is 4.0m/min to make the inner bladder layer 11 with a total thickness of 0.2mm, the thickness of the first high resilience thermoplastic polyurethane layer 111 can be 0.05mm, the thickness of the high airtight thermoplastic polyurethane layer 112 can be 0.1mm, and the thickness of the second high resilience thermoplastic polyurethane layer 113 can be 0.05 mm. The test data is shown in table 1 below:
TABLE 1
Referring to fig. 1 and 4, in step S42, the ball bladder layer 11 is covered with thermoplastic polyurethane yarn to form a yarn layer 12. In one embodiment, the thermoplastic polyurethane yarn is wrapped around the ball bladder layer 11 to form the yarn layer 12. Referring to the following comparison graph of breaking strength at 10% elongation (fig. 5), which shows the comparison of the conventional NYLON (NYLON 66220D) yarn with the thermoplastic polyurethane yarn of the present invention (HT-F210D), it is apparent that the breaking strength of the thermoplastic polyurethane yarn of the present invention (HT-F210D) is higher than that of the conventional NYLON (NYLON 66220D) yarn in each tensile test. And the breaking strength is relatively average each time.
Referring to fig. 1, fig. 3 and fig. 4, in step S43, a skin layer 13 made of thermoplastic polyurethane is manufactured. In one embodiment, the step of forming the skin layer 13 includes: a step of manufacturing an outer skin layer 131, a foamed latex layer 132 and an unfoamed latex layer 133, wherein thermoplastic polyurethane particles with Shore hardness of 80-90A and melting point of 140-160 ℃ are used, and the thermoplastic polyurethane particles are dried by a fourth dryer to make the water content below 300 ppm. And melting the thermoplastic polyurethane pellets by using a fourth extruder having a melting temperature of 185 ℃ to 200 ℃, in one embodiment, the melting temperature of the fourth extruder is set to 185 ℃, 200 ℃, 195 ℃ in this order. The outer skin layer 131 is made with a DIE temperature of 185 ℃ by a fourth metering pump.
In one embodiment, thermoplastic polyurethane particles having a Shore hardness of 60-85A and a melting point of 120-140 ℃ are used, and the thermoplastic polyurethane particles are dried by a fifth dryer to have a water content of 300ppm or less. And melting the thermoplastic polyurethane particles by using a fifth extruder, and adding 0.5-5.0% of microsphere foaming agent, wherein the melting temperature of the fifth extruder is 160-190 ℃, and in one embodiment, the melting temperature of the fifth extruder is set to 160 ℃, 190 ℃ and 185 ℃ in sequence. DIE temperature is 185 deg.C, through a fifth metering pump, to make the foamed latex layer 132.
In one embodiment, thermoplastic polyurethane particles having a Shore hardness of 60-85A and a melting point of 90-130 ℃ are used, the thermoplastic polyurethane particles are dried by a sixth dryer to have a water content of 300ppm or less, and the thermoplastic polyurethane particles are melted by a sixth extruder having a melting temperature of 160-180 ℃, and in one embodiment, the melting temperature of the sixth extruder is set to 160 ℃, 180 ℃, and 170 ℃ in this order. The DIE temperature is 185 ℃ and passes through a sixth metering pump to make the unfoamed latex layer 133.
In one embodiment, a second lamination wheel is used to cool the latex layer 132 to form a film, such that the latex layer 133 is disposed on the non-foamed latex layer 133 and the skin layer 131 is disposed on the foamed latex layer 132. The thickness composite ratio of the outer 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 lamination wheel is 4.0m/min to manufacture the skin layer 13 with a total thickness of 2.0mm, the thickness of the skin layer 131 can be 0.2mm, the thickness of the foamed latex layer 132 can be 1.6mm, and the thickness of the unfoamed latex layer 133 can be 0.2 mm. In one embodiment, the outer skin layer 131 has a thickness of 0.1-0.3mm, the foamed latex layer 132 has a thickness of 0.4-1.6mm, and the unfoamed latex layer 133 has a thickness of 0.1-0.3 mm.
Referring to fig. 1 and 4, in step S44, the skin layer 13 is wrapped around the yarn layer 12 and then is subjected to a heat treatment. In one embodiment, the yarn layer 12 is melt-bondable to the bladder layer 11 and the skin layer 13 using a thermal processing treatment.
In one embodiment, the manufacturing method of the present invention further includes a step of pressing the transfer texture by using a cooling wheel (Cold mold) to transfer the texture to the outer skin layer 131.
The manufacturing method of the thermoplastic polyurethane ball structure 10 of the present invention is made of thermoplastic polyurethane material, and meets the requirement of environmental protection and can be recycled, and the manufacturing method does not need any solvent and does 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 it is not necessary to bond each layer with an adhesive, and the manufacturing method of the thermoplastic polyurethane ball structure 10 of the present invention bonds each layer by melting, which can improve the peel strength between each layer and improve the overall peel strength of the thermoplastic polyurethane ball structure 10 of the present invention.
The above embodiments are merely illustrative of the principles and effects of the present invention, and do not limit the present invention. Modifications and variations of the above-described embodiments may be made by those skilled in the art without departing from the spirit of the invention. The scope of the invention is to be determined by the following claims.
Claims (10)
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
and the surface layer is made of thermoplastic polyurethane material and covers the yarn layer.
2. A thermoplastic polyurethane ball structure as in claim 1, wherein said yarn layer is wrapped around said ball bladder layer.
3. A thermoplastic polyurethane ball structure as defined in claim 1, wherein said yarn layer is made of a thermoplastic polyurethane wrap yarn or a thermoplastic polyurethane hot melt yarn.
4. The thermoplastic polyurethane ball structure of claim 1 wherein the skin layer comprises an outer skin layer and a latex layer.
5. The thermoplastic polyurethane ball structure of claim 4, wherein the latex layer comprises a foamed latex layer and an unfoamed latex layer, the foamed latex layer is disposed on the unfoamed latex layer, the outer skin layer is disposed on the foamed latex layer, and the thickness composite ratio of the outer skin layer, the foamed latex layer and the unfoamed latex layer is 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 0.1-0.3 mm.
6. A thermoplastic polyurethane ball structure according to claim 1, wherein the ball inner tube layer comprises a first high resilience thermoplastic polyurethane layer, a high air tightness thermoplastic polyurethane layer and a second high resilience thermoplastic polyurethane layer, the high air tightness thermoplastic polyurethane layer is disposed on the second high resilience thermoplastic polyurethane layer, the first high resilience thermoplastic polyurethane layer is disposed on the high air tightness thermoplastic polyurethane layer, and the thickness composite ratio of the first high resilience thermoplastic polyurethane layer, the high air tightness thermoplastic polyurethane layer and the second high resilience thermoplastic polyurethane layer is 1: 2: 1.
7. 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
and covering the surface layer with the yarn layer and carrying out heat treatment.
8. A method of manufacturing a thermoplastic polyurethane ball structure according to claim 7, wherein the step of manufacturing the ball inner tube layer comprises: preparing thermoplastic polyurethane particles with the viscosity of 0.5-2, drying the thermoplastic polyurethane particles through a drying cylinder to enable the water content of the thermoplastic polyurethane particles to be 20-50ppm, using a melt spinning process to convey the dried thermoplastic polyurethane particles into an extruder, melting the thermoplastic polyurethane particles, conveying the melted thermoplastic polyurethane particles to a metering pump, conveying the thermoplastic polyurethane particles to a spinning assembly through the metering pump to spray thermoplastic polyurethane filaments, cooling the thermoplastic polyurethane filaments through cooling air with the air temperature of 10-50 ℃, extending the thermoplastic polyurethane filaments through an extending roller device, winding the thermoplastic polyurethane filaments through a winding machine to obtain 200-plus-500-den thermoplastic polyurethane long fibers, and performing a ball liner process to obtain the ball liner layer.
9. A method of manufacturing a thermoplastic polyurethane ball structure according to claim 7, wherein the step of manufacturing the ball inner tube layer comprises: a step of manufacturing 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 make the water content below 300ppm, and the thermoplastic polyurethane particles are melted by a first extruder, the melting temperature of the first extruder is 160 ℃ to 180 ℃, the DIE temperature is 180 ℃, and the first high resilience thermoplastic polyurethane layer is manufactured 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.
10. a method of manufacturing a thermoplastic polyurethane ball structure according to claim 7, wherein the step of manufacturing 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 to drench the membrane wheel cooling film-forming and making the foaming emulsion layer set up in on the not foaming emulsion layer, the cortex set up in on the foaming emulsion layer, the thickness of cortex is 0.1-0.3mm, the thickness of foaming emulsion layer is 0.4-1.6mm, the thickness of not foaming emulsion layer is 0.1-0.3mm, just the cortex, the foaming emulsion layer and the thickness composite ratio of not foaming emulsion layer is 1: 8: 1.
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Cited By (1)
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| CN115253222A (en) * | 2022-07-22 | 2022-11-01 | 南京鼎辉体育科技发展有限公司 | Production process of frame leather-covered sports ball |
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