Design and manufacturing procedure of modern plastic products in Wuhan
DATE：2020/12/16 9:04:35 / READ： / SOURCE：This station
Design and manufacturing procedure of modern plastic products in Wuhan
When accepting a product task, technical personnel should first collect three aspects of information: ① material (including the properties of plastics, advantages and disadvantages, modification possibility, processing performance and price); ② molding (such as suitable molding, processing methods, surface decoration, molding equipment and mold); ③ product application. www.handern.com Plastic sheet extrusion equipment
Then, design and manufacture the products according to the following procedures: ① determine the material according to the product quality requirements, appearance and appearance requirements, use environment and use function, and the delivery time of required quantity, to determine the material, that is, to select the plastic variety, brand and formula; ② to select the appropriate molding and processing technology; ③ to design the product drawing; ④ to design the mold drawing; ⑤ Selecting the material and manufacturing mold of the mold; 6) determining the process conditions and trial production; 7) testing the trial production products; 8) trial production; 9) putting into production; 10) tracking and investigating the products and accumulating data; 5) improving the product and mold design.
The material selection should be carried out in the following order:
① Low cost, low cost, low cost, long service life and low maintenance and management cost.
In the selection of materials, the following items should be considered: ① the temperature change of the use environment, whether the selected material is resistant to high temperature; ② the resistance of contact substances (water, solvent, oil, chemical medium, etc.); ③ the influence of sunlight; ④ the endurance of service load; ⑤ food hygiene and safety in use; ⑥ the degree of thermal insulation and insulation; ⑦ bending strength; ③ fire resistance and flame resistance; ⑤ economy; ⑩ Necessary dimensional accuracy and dimensional stability; ⑪ satisfaction degree of surface decoration and appearance; ⑫ optical characteristics; ⑫ creep resistance; ⑮ antibacterial property; ⑮ other requirements.
In the process of material selection, comprehensive evaluation is mainly based on the above requirements, the advantages and disadvantages of plastics and the stability of raw material sources. Now take polypropylene and high density polyethylene as examples. They are similar, but also different. www.handern.com Plastic sheet extrusion equipment
(1) appearance: PP should be selected in terms of product surface luster; PP should be selected from the aspect of reproducibility of fine texture. Due to the high shrinkage rate of HDPE molding, it often leaves the mold cavity surface earlier due to shrinkage in the molding process; from the perspective of transparency, HDPE should be selected; if you want to manufacture containers that can see the contents, such as syringes and other medical appliances or bottles, PP should be selected.
(2) Dimensional stability: from the perspective of appearance and dimensional stability, PP should be selected.
(3) service environment temperature: the hot deformation temperature of HDPE is 71 ° C, while PP is 110 ° C. from the perspective of steam sterilization and heat resistance requirements, PP is of course used; but from the low-temperature performance point of view, the cold resistance and low-temperature impact resistance of HDPE are greatly better than PP, so HDPE is the best for all products used in cold regions, cold warehouses and freezers.
(4) Weather resistance: HDPE is better than pp. HDPE can be used outdoors for more than 10 years, and it has been used underground for nearly 30 years, and it has good impact resistance.
(5) Lightweight and price: PP is lighter, and the price is almost the same as HDPE. Therefore, it is mainly measured from the perspective of molding. For injection molding products, PP is used; if extrusion or rotary molding, LDPE is used. www.handern.com Plastic sheet extrusion equipment
(6) chemical medium resistance: HDPE and PP have good heat resistance, but HDPE is better than PP in oil resistance. However, as medical appliances and containers, detergent bottles and other commonly used PP (HDPE is prone to stress cracking under the action of detergent).
When accepting a product task, technical personnel should first collect three aspects of information: ① material (including the properties of plastics, advantages and disadvantages, modification possibility, processing performance and price); ② molding (such as suitable molding, processing methods, surface decoration, molding equipment and mold); ③ product application. www.handern.com Plastic sheet extrusion equipment
Then, design and manufacture the products according to the following procedures: ① determine the material according to the product quality requirements, appearance and appearance requirements, use environment and use function, and the delivery time of required quantity, to determine the material, that is, to select the plastic variety, brand and formula; ② to select the appropriate molding and processing technology; ③ to design the product drawing; ④ to design the mold drawing; ⑤ Selecting the material and manufacturing mold of the mold; 6) determining the process conditions and trial production; 7) testing the trial production products; 8) trial production; 9) putting into production; 10) tracking and investigating the products and accumulating data; 5) improving the product and mold design.
The material selection should be carried out in the following order:
① Low cost, low cost, low cost, long service life and low maintenance and management cost.
In the selection of materials, the following items should be considered: ① the temperature change of the use environment, whether the selected material is resistant to high temperature; ② the resistance of contact substances (water, solvent, oil, chemical medium, etc.); ③ the influence of sunlight; ④ the endurance of service load; ⑤ food hygiene and safety in use; ⑥ the degree of thermal insulation and insulation; ⑦ bending strength; ③ fire resistance and flame resistance; ⑤ economy; ⑩ Necessary dimensional accuracy and dimensional stability; ⑪ satisfaction degree of surface decoration and appearance; ⑫ optical characteristics; ⑫ creep resistance; ⑮ antibacterial property; ⑮ other requirements.
In the process of material selection, comprehensive evaluation is mainly based on the above requirements, the advantages and disadvantages of plastics and the stability of raw material sources. Now take polypropylene and high density polyethylene as examples. They are similar, but also different. www.handern.com Plastic sheet extrusion equipment
(1) appearance: PP should be selected in terms of product surface luster; PP should be selected from the aspect of reproducibility of fine texture. Due to the high shrinkage rate of HDPE molding, it often leaves the mold cavity surface earlier due to shrinkage in the molding process; from the perspective of transparency, HDPE should be selected; if you want to manufacture containers that can see the contents, such as syringes and other medical appliances or bottles, PP should be selected.
(2) Dimensional stability: from the perspective of appearance and dimensional stability, PP should be selected.
(3) service environment temperature: the hot deformation temperature of HDPE is 71 ° C, while PP is 110 ° C. from the perspective of steam sterilization and heat resistance requirements, PP is of course used; but from the low-temperature performance point of view, the cold resistance and low-temperature impact resistance of HDPE are greatly better than PP, so HDPE is the best for all products used in cold regions, cold warehouses and freezers.
(4) Weather resistance: HDPE is better than pp. HDPE can be used outdoors for more than 10 years, and it has been used underground for nearly 30 years, and it has good impact resistance.
(5) Lightweight and price: PP is lighter, and the price is almost the same as HDPE. Therefore, it is mainly measured from the perspective of molding. For injection molding products, PP is used; if extrusion or rotary molding, LDPE is used. www.handern.com Plastic sheet extrusion equipment
(6) chemical medium resistance: HDPE and PP have good heat resistance, but HDPE is better than PP in oil resistance. However, as medical appliances and containers, detergent bottles and other commonly used PP (HDPE is prone to stress cracking under the action of detergent).
Author：admin