Medical micro-moulding goes multi-cavity
By Barry Copping
Posted 26 April 2012
At the recent NPE2012 trade show, St Paul, Minneapolis-based Mold Craft showcased a four-cavity injection mould for very small parts.
The funnel tip component for a medical customer of Mold Craft was moulded in PEEK in the new Sodick Plustech LP20EH2 machine with a 12 mm diameter plunger.
The funnel tip has a minimum thin wall section of 0.2mm. Designed and built by Mold Craft, the tool incorporates the patented MeltFlipper technology from Beaumont Technologies. The part is 33mm long by 1.37mm at the top of the funnel and 1.0mm at the tip.
According to Jim Liddel, new business development for Mold Craft, the mould started out as a single-cavity tool designed in a larger mould base to accommodate expansion.
“To prove the design, Sodick ran the mould and it worked so well that the mould was then expanded to four cavities,” he states. “Eventually, the mould will be an eight-cavity tool.”
Mold Craft worked with Beaumont Technologies to verify the mould design using Beaumont’s proprietary VeriFlo mould-filling analysis software.
Beaumont’s Melt Flipper module was used for the mould design because there was concern about the material flow and being able to fill the cavities evenly using PEEK material.
“The mould filling analysis revealed a number of negative effects from shear,” notes Liddel. “The MeltFlipper technology eliminated those concerns.”
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