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The injection molding machine is a universal device. The tool determines what is made. Therefore, almost any injection molding machine with suitable tools can be used to make cups. The size of the machine needs to be adjusted so that the injection volume is slightly larger than the amount of material used to make the cup and the gate and runner system required in the mold. For small items such as cups that are manufactured in large quantities, large machines with multi-cavity tools are usually used. In this way, in each cycle of the machine, you will get multiple cups.
Plastic cups can also be manufactured using processes other than injection molding, and other types of machines can be used. The red solo cup was cut from a hot plastic board. The cold plastic sheet enters the machine and then passes through the oven to heat and soften the plastic. The sheet enters a mold that uses pressure and tool form to form a cup. The formed cup is punched out from the lip forming sheet. Turn on the tool and blow the cup out.
The styrofoam beads are pumped into the mold with air through air such as a vacuum hose. The foam beads are then heated with steam or hot air to bulge them and fuse them together in a closed mold. The mold is cooled and opened, and the cup pops out.
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