8700
A model solely based on heat transfer considerations is proposed to estimate the maximum feeding rate before the extrusion becomes unstable .
 model, heat transfer, extrusion
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 model, heat transfer, extrusion