Micro Part Design
- Does your design have wall stocks in the range of .002” to .004”? (See image below.)
- Does it have aspect ratios in the range of 250:1?
- Is your part weight so low that you can make 520 parts from a single pellet of plastic?
All of these features can be accomplished and are generally recognized by the industry as being micro and requiring specialized tools.
Micro Design Features
Something to remember is that a part does not need to be microscopic to be considered a micro part. This has been proven to be one of the greatest myths of the medical device industry.
In many instances, micro part features that can be seen with the naked eye require more specialized tools and techniques than what’s required for a microscopic part with simple geometry. In micromolding, some of the most difficult parts to manufacture are “larger” parts with micro features.
Micro Technology Tools
MTD uses our in-house 3 Micro Technology Tools to optimize your micro part design:
- MicroFill – Using a spiral mold at selected melt temperature, several injection velocities are run and peak pressure, transfer pressure and flow length are recorded. From that, sheer sensitivity of the material is determined.
- MicroFlow – Using a thickness plaque that ranges from .002-.009”, the effect of a reduced wall section on flow length is seen. Running through multiple injection velocities, while measuring flow length, realistic wall thicknesses for certain materials is determined.
- MicroRunner– This tool has a ratcheting runner system that varies in diameter and aids in determining the minimum runner size required to fill the volume of your part with the goal of sizing a runner system to adequately mold a product without sacrificing material. This is extremely important for expensive materials.