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What is the primary function of an injection unit?
The primary function of an injection unit in an injection molding machine is to melt the raw plastic material (plasticizing) and then inject the molten polymer into the mold cavity under high pressure.
What are the main components of an injection unit?
An injection unit typically consists of a feed hopper, a heated barrel, a reciprocating screw, band heaters, and an injection nozzle. These components work together to heat, mix, and move the plastic material.
How do I choose the correct injection unit size for my production?
Selecting the right injection unit depends on your required shot weight, clamping force, the type of plastic material being used, and the desired injection pressure and speed needed for your specific mold design.
What maintenance is required for an injection unit?
Regular maintenance includes purging the barrel to remove degraded material, checking and calibrating the heating bands, inspecting the screw and non-return valve for wear, and ensuring proper lubrication of all mechanical parts.
What are the signs of a worn-out screw or barrel in the injection unit?
Common signs of wear include fluctuations in shot size, increased recovery times, black spots or discoloration in the molded parts, and a drop in overall injection pressure during production cycles.