Custom Plastic Profile Extrusion Services
At Custom Molding Company, our quality-assured South African facility operates high-throughput continuous extrusion lines designed for global export. We specialize in converting complex cross-sectional geometries into continuous profiles, delivering exceptional cost arbitrage for US and UK buyers requiring high-volume linear plastics.
From rigid PVC window channels to flexible thermoplastic elastomer (TPE) automotive weather seals, our extrusion engineering team manages the entire lifecycle—from custom die design and wire-EDM tooling to inline cooling calibration and automated cut-to-length packaging.
Extrusion Capabilities
- Single Profile Extrusion
- Co-Extrusion (Rigid + Flexible)
- Tri-Extrusion (Multi-material)
- Inline Taping & Punching
- Custom Color Matching
Advanced Co-Extrusion and Tri-Extrusion
Our most requested service for automotive and construction applications is multi-material extrusion. By synchronizing multiple extruders into a single specialized die, we can fuse distinct polymers into a single continuous profile.
| Extrusion Type | Mechanism | Primary Advantage | Common Applications |
|---|---|---|---|
| Single Extrusion | One polymer forced through a single die | High speed, low tooling cost | Pipes, tubes, simple structural channels |
| Co-Extrusion | Two polymers fused simultaneously | Combines rigid structure with flexible sealing | Automotive weather stripping, refrigerator gaskets |
| Tri-Extrusion | Three distinct polymers fused | Maximum functional integration, zero assembly | Complex architectural glazing seals |
Value Engineering: The Core/Cap Strategy
One of the most effective ways we reduce unit costs for our clients is through core/cap co-extrusion. Instead of running a profile entirely in an expensive, UV-stabilized, or custom-colored resin, we extrude the bulk structural core using utility-grade or regrind ABS or PVC. We simultaneously extrude a micro-thin "cap" layer of premium virgin material over the visible surfaces. This delivers the aesthetic and environmental resistance of a premium polymer at a fraction of the volumetric material cost.
Inline Secondary Operations
To minimize handling and labor costs, our extrusion lines are equipped with automated inline secondary processing equipment. As the profile exits the cooling calibration bath, it can be continuously processed before being cut to length:
- Inline Taping: Automated application of 3M VHB or double-sided acrylic foam tapes to the back of the profile.
- Inline Punching & Routing: Synchronized pneumatic presses punch mounting holes or slots at exact intervals without stopping the line.
- Inline Printing: Inkjet or laser printing of part numbers, lot codes, or assembly instructions directly onto the profile.
Ready to Reduce Your Extrusion Costs?
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