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The process faced some difficulties , for example in what concerns the needle blocking during extrusion if the gel point is above room temperature .
 concept or principle: process; manufacturing process: faced; concept or principle: blocking; manufacturing process: extrusion; machanical property: gel point; process parameter: temperature
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: process; manufacturing process: faced; concept or principle: blocking; manufacturing process: extrusion; machanical property: gel point; process parameter: temperature