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Preheating of the substrates increased the joint strength via improvement in the bonds between the polymer sheet and the additive part and increase in the adhesion force between the printed layers .
 manufacturing process: Preheating; concept or principle: joint; material: polymer; material: additive; machanical property: adhesion
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:
 manufacturing process: Preheating; concept or principle: joint; material: polymer; material: additive; machanical property: adhesion