Patent ID: 7186110

Claim:
An apparatus, comprising: an extruder having an inlet, a heater and an outlet, wherein a plastic material is fed into the extruder via the inlet, melted by the heater and extruded out of the extruder via the outlet; a die head having a channel with an inlet and an outlet, wherein the inlet of the die head is connected to the outlet of the extruder; a rolling device having two rollers, each of which has an axle and a circumference, wherein a space between the rollers has at least a thick portion and at least a narrow portion, wherein the thick portion has a height, which is a distance between the circumferences of the rollers, which is greater than that of the narrow portion; wherein the space of the rolling device is aligned with the outlet of the die head and the outlet of the die head has a shape corresponding to the space, so that the plastic material flows into the space of the rolling device via the channel of the die head and is rolled by the rollers, and a cutting device arranged behind the rolling device to cut the plastic material rolled by the rolling device to get wedged plates.