Announcing a Major Crosshead Advancement for Precision Micro Extrusion

Micro Extrusion Crosshead

The BH25A Micro Crosshead with Spiral Deflector delivers breakthrough micro extrusion performance for microbore tubing, fiber optics and insulated fine wire.

The BH25A Micro Crosshead is compact, easy to handle tooling that extrudes:

  • PEEK tubing with a product ID of .010” and OD of .015".
  • FEP insulated fine wire with an OD of .00471" and a core OD of .00157".

The BH25A Micro Crosshead was tested by major medical device manufacturers under production conditions. These tests showed the BH25A delivered improvements in process stability of 30% or higher, and with tolerances never before achieved: less than .00010”.

Customers who tested the BH25A Micro Crosshead with Spiral Deflector achieved exceptional ID/OD control, superior melt flow, and highly uniform material distribution.

In addition, two critical design features prevent material degradation. The flow channel design of the BH25A Micro Crosshead — specifically the absence of hard edges and low-velocity pockets — effectively preserves the molecular weight of the material, thus preventing mechanical degradation, and optimizing melt flow. The brief residence time of the BH25A prevents pyrogenic material degradation.

The result: extraordinary concentricity, OD control, and finished surface quality. Also, this low area crosshead creates a flow so thin, you can actually heat less, and because the material gradient is less, adjustment is always simpler and faster.

Customers using this innovative tooling reported that these features provide a significant competitive advantage, whether the final product is bioabsorbable devices, communications electronics or a proprietary OEM application. They also report that the BH25A allows them to extrude materials that were not extrudable in the past, providing another substantial benefit.

The BH25A Micro Crosshead is manufactured with an adjustable center, in two versions. Both are appropriate for biomedical and other FDA/ USP Class VI applications. A 420 stainless steel model provides optimum performance for thermoplastics; a Hastelloy head is specified for fluoropolymers. The BH25A was engineered for quick assembly, disassembly, and cleaning.

Visitors to MD&M West (click for photo) and Wire Expo this year were among the first to see the BH25A Micro Crosshead. An American Kuhne line showing their 1/2" gearless micro extruder outfitted with the BH25A produced thermoplastic microbore tubing (.014” ID x .026” OD) during MD&M. For your demonstration, contact Peter Neville, B&H Tool Company President, at pneville@bhtool.com.