Contact Molding (Hand Lay-Up)
Open-mold process where fiber layers and resin are applied manually and consolidated using rollers. This traditional method is known for its simplicity and cost-effective material usage, making it well suited for small production runs and large composite parts.
Contact Molding Process
The Steps
Gelcoat Application
Liquid gelcoat is sprayed into the mold
Application of Resin and Fiber Layers in the Mold
Fiber layers are placed in the mold and impregnated with resin
Conforming the Fiber Layers and Resin to the Mold
The fiber layers are compacted and de-aired using rollers to ensure proper impregnation and conformity to the mold surface
Resin Curing
A chemical reaction converts the resin
from a liquid to a solid state
Part Demolding
The finished part is removed from the mold
Process Comparison Table
| Contact Molding | Infusion | LRTM | RSB | |
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| Mechanical properties |  |
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| Consistent part thickness |  |
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| Lightweight design potential |  |
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| Environmental footprint |  |
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| Material costs |  |
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