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The Spinneret
Fall 2016
A ramé-hart Newsletter Covering Coaxial and Triaxial Needle Products


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Coaxial Electrospinning Done by High Schoolers
Students in North Penn High School’s Engineering Academy have been electrospinning polymer nanofibers for more than ten years. Experiments have ranged from pure research activities to applied research endeavors in the energy, environment and health care sectors.

This past school year (2015-2016), two of the student research teams developed core-sheath nanofibers for energy (phase change material embedded nanofibers) and healthcare (medicinal encapsulated cellular scaffolds) applications. Each team set out to develop its own coaxial apparatus.

Figure 1: Coaxial Device Fabricated with 3D Printer

One team proposed a coaxial design that could be fabricated using a 3D printer (see Figure 1). The body was fabricated but the 3D printing filament available in the laboratory was incompatible with the solvents necessary for their experiments. Thus this plan was not completely successful. 

Figure 2: Homemade Coaxial Design

Another approach involved the joining of two separate syringes and needles (see Figure 2). However, this method was difficult to setup and yielded inconsistent and undesirable results. It was a noble effort nonetheless.

Figure 3: ramé-hart Coaxial Needle

By using a coaxial needle made by ramé-hart instrument co. (see Figure 3), the students were free to use any solvent necessary for their research and were able to achieve success on their first electrospinning trial. In short, it may be fun and challenging to try but it's difficult to replicate the success of the time-proven ramé-hart design.

Figure 4: Students in the Engineering Academy at North Penn High School in Lansdale, Pennsylvania, USA.

We'd like to extend a special thank you to Michael Boyer, Instructor at North Penn High School, and all of the students in the Engineering Academy (see Figure 4) for their collaboration and for providing the pictures and content for this article.


What's New

1. We've increased the number of in-stock ready-to-ship prebuilt coaxial needles from six to seven. The newest size uses a 14g inner needle and 10g outer needle. A copy of the updated prebuilt coaxial needle drawing can be found here: http://www.ramehart.com/pdf/coaxial_prebuilt.pdf. The prebuilt coaxial needles can be ordered online here: http://www.ramehart.us/prebuilt-coaxial-needle/.

2. We currently offer one prebuilt triaxial needle design. The drawing can be found here: http://www.ramehart.com/pdf/triaxial_prebuilt.pdf. This item is kept in stock and can be ordered here: http://www.ramehart.us/prebuilt-triaxial-needle/.

3. Due to customer demand, we now offer an assortment of reusable Straight 304 Stainless Steel Needles for dispensing at a significant savings over purchasing these needles separately. The assortment (p/n 100-10-12-ASST) includes (1) needle for each even gauge between 14g and 30g and (2) 22g needles - a total of ten needles - and is available here.

Needle Assortment p/n 100-10-12-ASST

Use the coupon below to save $25 off the Needle Assortment when purchased online at our webstore. Use coupon code NEEDLEASST on or before 31-Oct-2016.

Check out our website at www.customspinnerets.com. If you don't see what you are looking for, contact us and let us know what you require. Chances are we can make it.

Thank you for your business. Each day we strive to maintain our position as the world's number maker of custom coaxial and triaxial spinnerets.


Carl Clegg
Director of Sales
Phone 973-448-0305
Contact us



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