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This study aims to enhance the understanding of how the process of sintering can affect the density evolution of a Ti-6Al-4 V binder jet printed part .
 concept or principle: process; manufacturing process: sintering; machanical property: density; material: Ti-6Al-4 V; material: binder
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: process, sintering, density, Ti-6Al-4 V, binder 
Answer:
 concept or principle: process; manufacturing process: sintering; machanical property: density; material: Ti-6Al-4 V; material: binder