Injection Molding Solutions for Medical Products

Typical medical and healthcare plastic parts

Disposable medical and laboratory products are produced in high volumes on multi-cavity molds, where small variations in shot weight or cooling show up as dimensional drift across cavities. Machine selection starts from the part family, the cavitation and the tolerance stack the assembly allows.

Syringe barrels and plungers

Long, thin cores and tight bore tolerances call for stable injection, balanced filling and consistent cooling across cavities.

Caps and closures

Small shot weights in high-cavitation molds, where shot-to-shot repeatability matters more than raw injection capacity.

IV and tube connectors

Luer and barb geometries need accurate sealing surfaces and clean, burr-free parting lines.

Specimen containers and petri dishes

Clear PS or PP parts where flatness, clarity and stack fit are checked on every lot.

Pipette tips

Very small parts with critical tip geometry and straightness, typically run in 16 to 96 cavity molds.

Device housings

ABS or PC housings with snap fits, bosses and cosmetic surfaces for diagnostic and handheld devices.

Typical materials and processing notes

Values are typical starting points; confirm final settings with your resin supplier's datasheet.

Process requirements buyers define

Cleanroom compatibility, validation documentation and regulatory requirements are defined by the buyer's quality system. State them in the project brief so the machine configuration, auxiliary equipment and acceptance trial are planned around them.

Dimensional stability

Consistent shot weight, holding pressure and cycle keep critical dimensions within tolerance across all cavities.

Clean material handling

Closed hopper loaders, dryers and conveying lines reduce dust and contamination before the resin reaches the screw.

Mold temperature control

Dedicated mold temperature controllers and chillers hold mold surfaces within a narrow band for repeatable shrinkage.

Contamination-free part handling

Robot take-out and conveyors limit manual contact between ejection and packing.

Documented process parameters

Recorded setpoints and actual values give a reference process for each mold.

Traceability

Lot, mold and machine records link finished parts back to production conditions.

Machine selection inputs

For general precision medical and labware parts, the M8SII servo-hydraulic series is the usual starting point, with 25 models from 900 to 33,000 kN and several injection-unit options per model, so the screw can be matched to the actual shot.

Cavitation

Mold size and cavity count set tie-bar spacing, platen size and clamp force more often than the part itself.

Shot utilization

A typical target is 20–80% of barrel capacity; small shots in a large barrel increase residence time and degradation risk.

Cycle

Thin parts may cycle in 6–12 s, so cooling capacity and take-out timing need to be planned with the machine.

All-around precision

Repeatable injection, clamp parallelism and stable oil temperature together determine cavity-to-cavity consistency.

Project brief checklist

Part data

Drawings or 3D files, part weight, wall thickness and critical dimensions.

Material

Resin grade, colorant and any additive or regrind limits.

Mold

Cavity count, mold dimensions, hot runner details and ejection layout.

Output

Target cycle time and annual or hourly volume.

Environment and quality

Cleanroom class, documentation and acceptance requirements from your quality system.

Automation

Take-out, inspection, counting and packing needs.