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An urgent need in the laser powder bed fusion ( LPBF ) process is to efficiently remove emissions from or around the moving melt pool since the powder bed contamination by spatter can potentially damage fabricated part quality .
 manufacturing process: laser powder bed fusion; manufacturing process: LPBF; concept or principle: process; material: melt pool; machine or equipment: powder bed; process characterization: spatter; machanical property: damage; concept or principle: quality
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: laser powder bed fusion, LPBF, process, melt pool, powder bed, spatter, damage, quality 
Answer:
 manufacturing process: laser powder bed fusion; manufacturing process: LPBF; concept or principle: process; material: melt pool; machine or equipment: powder bed; process characterization: spatter; machanical property: damage; concept or principle: quality