a racket
A racket, all-in-one technology, applied to the racket. It can solve the problems of complex racket production process, insufficient elasticity and low output, and achieve the effect of effective pressure transmission, high speed and low cost of raw materials.
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preparation Embodiment 1
[0028] (1) The foamed particles are placed in a twin-screw extruder. Inject the foaming agent accounting for 10% of the weight of the expanded particles at the end of the extruder, heat it through the screw, melt and mix it at 200°C to obtain a mixed melt;
[0029] (2) pump the mixed melt into the cooling extruder, further mix the mixed melt in the cooling extruder, and lower the temperature to 160° C. to obtain a cooled mixed melt;
[0030] (3) Expand the cooled mixture through a circular die under a pressure of 20 MPa to obtain a linear expanded extrudate, place the expanded extrudate in an underwater granulation device, and perform underwater ring cutting at 70°C Granulation; drying the obtained granules to obtain foamed granules.
[0031] (4) Annealing the foamed particles at 160° C. for 15 minutes to reduce the particle size by 20 to 50 percent; cooling the annealed foamed particles to room temperature;
[0032] (5) Extrude the PET sheet accounting for 2% of the volume ...
preparation Embodiment 2
[0034] (1) The foamed particles are placed in a twin-screw extruder. Inject a foaming agent accounting for 5% of the weight of the foamed particles at the end of the extruder, heat it through the screw, melt and mix it at 200°C, and obtain a mixed melt;
[0035] (2) pump the mixed melt into the cooling extruder, further mix the mixed melt in the cooling extruder, and lower the temperature to 160° C. to obtain a cooled mixed melt;
[0036] (3) Expand the cooled mixture through a circular die under a pressure of 20 MPa to obtain a linear expanded extrudate, place the expanded extrudate in an underwater granulation device, and perform underwater ring cutting at 70°C Granulation; drying the obtained granules to obtain foamed granules.
[0037] (4) Annealing the foamed particles at 160° C. for 15 minutes to reduce the particle size by 20 to 50 percent; cooling the annealed foamed particles to room temperature;
[0038] (5) Extrude the PET sheet accounting for 2% of the volume of ...
preparation Embodiment 3
[0040] (1) The foamed particles are placed in a twin-screw extruder. Inject a foaming agent accounting for 15% of the weight of the foamed particles at the end of the extruder, heat it through the screw, melt and mix it at 200°C, and obtain a mixed melt;
[0041] (2) pump the mixed melt into the cooling extruder, further mix the mixed melt in the cooling extruder, and lower the temperature to 160° C. to obtain a cooled mixed melt;
[0042] (3) Expand the cooled mixture through a circular die under a pressure of 20 MPa to obtain a linear expanded extrudate, place the expanded extrudate in an underwater granulation device, and perform underwater ring cutting at 70°C Granulation; drying the obtained granules to obtain foamed granules.
[0043] (4) Annealing the foamed particles at 160° C. for 15 minutes to reduce the particle size by 20 to 50 percent; cooling the annealed foamed particles to room temperature;
[0044] (5) Extrude the PET sheet accounting for 2% of the volume of...
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Abstract
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