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Although we find the weld thickness to be of the order of the polymer size , the structure of the weld is anisotropic and relatively disentangled ; reduced mechanical strength at the weld is attributed to this lower degree of entanglement .
 process parameter: weld thickness; material: be; material: polymer; concept or principle: structure; engineering feature: weld; machanical property: anisotropic; machanical property: mechanical strength; engineering feature: weld
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:
 process parameter: weld thickness; material: be; material: polymer; concept or principle: structure; engineering feature: weld; machanical property: anisotropic; machanical property: mechanical strength; engineering feature: weld