close-up of original amber colored plastic lump with blue background

plastic lumps cake polymer resin process industry purge injection molding moulding extrude extrusion clean machine cylinder extruder screw cavity sinkhole shrink bubble blowhole cavities shrinkage pinhole hole blister close close-up waste check prove test testing processing tool manufacturing engineering industrial shredding recycling background lump sinkholes bubbles yellow color blue colour red dark light green origin original blowholes amber colored