Abstract:
Nowadays, the plastic is used to make different kinds of agricultural equipment. In general, plastic injection molding, blow molding and swirling molding are used to make plastic agricultural equipment such as plastic flowerpots, earthworm nesting bins, and animal feed containers.
The plastic forming machine was specially designed and equipped with a 0.5-hp rotary engine with the rotational speed of 20 rpm. It could be adjusted to rotate the horizontal axis of the work piece with a 1- hp geared motor of 20 rpm, connected to that of 60 rpm on the vertical axis. The machine revolution speed was adjustable. The rotational speed of the horizontal axis was then measured at 10, 15, 20 rpm to let plastic beads flow smoothly in the mold. After that, the horizontal axis was tested with a constant vertical axis of 2 rpm, burned by a gas burner at 180 degree Celsius for 7,10,13 minutes, and blown to cool down for 10 minutes. Finally, the mold of a flowerpot with a diameter of 0.57m and height of 0.5m was filled with 4 kilograms of plastic beads (LLDPE).
The experimental result indicated that the best performance of plastic molding for a 0.57m x 0.5m flowerpot was 4 kilograms of plastic beads burned for 10 minutes under the temperature of 180 degree Celsius at the rotational speed of 40 rpm on the horizontal axis and 2 rpm on the vertical axis.