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Plastics can be processed with the following methods: machining, compression molding, transfer molding, injection molding, extrusion, rotational molding, blow molding, thermoforming, casting, forging, and foam molding.
For injection molding, the injection pressure can be between 15,000 and 20,000 psi (103–138 MPa). The average injection molding machine has 20,000 psi.
There are three types of injection molding machines, classified by the type of drive/motor — hydraulic, electric, or hybrid.
Injection units are rated in terms of the maximum injection pressure and injection volume available. Injection pressure is the theoretical maximum available at the downstream end of the screw. This is a function of the screw diameter and the force acting on it.
The ventrogluteal muscle can accommodate up to 2.5 ml, with a maximum volume of 3 ml. The rectus femoris and vastus lateralis remain the recommended sites for volumes up to 5 ml in adults. A maximum of 2 ml is recommended for older adults and thin patients.
A major advantage of utilizing injection molding as your company's primary manufacturing process is the large quantity production of parts for a lower cost. It helps that there are many companies out there that offer injection molding machines to businesses, which makes the process easy to source.
This method has produced solid parts such as electronic housings, bottle caps, containers, computers, televisions components, outdoor furniture, agricultural products, toys, machinery components, and much more.
Plastic injection moulding advantages centre around great precision and high repeatability, combined with speed, a low cost per part and a huge choice of available plastics. Disadvantages include a higher initial cost and lead time than some other processes.
However, even this can change depending on the manufacturer; according to Plastics Technology, Sony uses ABS that has a melt temperature of 240 degrees Celsius (464 degrees Fahrenheit).
different viscosities are reflected in cavity pressure, so cavity pressure of PC lamp holder should be 160 bar*K (the viscosity grade of PC). P = 160*1.9 bar = 304 bar for safety reasons, we take 1.9 times. F=P*S=304bar*380cm2=304kg/cm2*380 cm2=115520Kg or 115.5Ton, so 120T~130T injection machine can be used.
rapid injection molding prototyping
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