Ballpoint/Rollerball Pens: Writing Performance and Evaluation

Round 1

Reviewer 1 Report

Ballpoint/Rollerball Pens: Writing Performance and Evaluation by Jongju Lee, Sohail Murad and Alex Nikolov

It is an interesting paper presenting experimental studies about ballpoint/rollerball pens and the fountain pen writing performance, together with a brief history of their development.

The structure of the paper is appropriate. However, the results section could be more in-depth, showing how authors finding suggest ink development and what parameters should be optimized.

 

Authors should use more academic language, not use personal pronouns (we) and present perfect instead. The results and discussion section are too descriptive. Please add a bit more in-depth analysis of your results. 

Author Response

Please see the attachment

Author Response File: Author Response.pdf

Reviewer 2 Report

The manuscript contains a brief review on the writing performance and evaluation of ballpoint/rollerball pens. The authors included a short historical overview in the Introduction. The experimental part 2 is important in order to understand the proposed two approaches for detection the quality of the respective pens. The cited literature in Part 3 give idea on the theoretical approaches used for the physicochemical modeling of the complex fluid motion and deposition of ink.

The manuscript is suitable for publication after minor revisions:

1. Fig. 3 is not informative.

2. Fig. 7 is a sketch of the three phase contact angle and interfacial tensions - the readers are familiar with these definitions.

3. Chapters 3.3 and 3.4 should be extended to include more explanations on the main assumptions and physical meaning of the reported final equations. 

Author Response

Please see the attachment.

Author Response File: Author Response.pdf