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In polymer extrusion ( PE ) , the most recently extruded polymer filament must bond to the previously extruded filament via polymer diffusion to form a “ weld ” .
 manufacturing process: polymer extrusion; manufacturing process: PE; manufacturing process: extruded; material: filament; manufacturing process: extruded; concept or principle: polymer diffusion; engineering feature: weld
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: polymer extrusion, PE, extruded, filament, extruded, polymer diffusion, weld 
Answer:
 manufacturing process: polymer extrusion; manufacturing process: PE; manufacturing process: extruded; material: filament; manufacturing process: extruded; concept or principle: polymer diffusion; engineering feature: weld