Plastic Overmolding

Overmolding on textiles allows us to create highly attractive assemblies, manufactured without unsightly seams, that enhance our customers’ products—and to produce technical subassemblies in a single operation, with complete repeatability.

The applications are endless: luxurious bag and luggage handles with a pleasant feel, straps fitted with sophisticated buckles, overmolded closure systems, plastic end caps integrated into straps or ribbons, beads overmolded onto cords and bungee cords, tear-resistant plastic eyelets, a molded elastic cable to regulate airbag deployment, elastic cord hooks, net frames formed directly onto the mesh, or filtration structures.

This is a delicate technique: it requires combining a highly precise plastic molding process with textile components whose tolerances are, by nature, quite variable—as is the case with our overmolding on elastic. Because we manufacture the straps, ribbons, elastic bands, braids, and cords that we overmold ourselves, we have full control over the tolerances on both sides of the mold.

Technical products often feature plastic overmolds on metal substrates. The variety of our products allows us to work with plastics, sheet metal, stamped parts, metal wires and springs, tubes, and all other types of inserts—including mechanical parts such as our overmolded shafts and overmolded gears. See all of these projects on our plastic-over-metal overmolding page.

Sagaert also includes several engineering offices, three tooling plants, and a facility specializing in inspection jigs: the technical solutions we offer are tailored to your part, implemented quickly… and cost-effective.

Depending on the part, we combine several techniques: insert molding (the insert is placed in the mold before injection), two-stage molding, and two-material overmolding. These methods create a mechanical or chemical bond between the materials, ensuring the strength of the assembly and a high-precision finish—particularly for our overmolded parts with high tensile strength.

Our facilities are equipped with both highly flexible manual machines and fully automated production lines: as a result, whether for small or large production runs, we offer the best balance between tooling costs and unit cost tailored to your production volume—for both one-off parts and our most demanding technical overmolding applications.

We overmold a wide range of polymers, including PBT, silicone, and elastomers, selected based on the insert material and the mechanical stresses of the part—whetherthe inserts are metal or textile. Our parts are manufactured to the dimensions required for each application.

Thanks to our production equipment, each part can be produced in a wide range of colors, using formulations that are resistant to UV rays and environmental factors.

Overmolding improves the product's grip, integrates features directly into the part (metal inserts, end caps, eyelets), and eliminates assembly steps: fewer components, fewer handling steps, optimized costs, and faster production rates.

It is used in many industries: automotive and mobility, medical and paramedical devices, sports and water sports equipment—such as bungee cord hooks and net frames—as well as connectors, ergonomic handles, and seals for electronics and industrial equipment.

At Sagaert, inserts and overmolding are manufactured under one roof—whether for textile or metal overmolded inserts. Our injection molding machines, our expertise in tooling design, and our in-house inspection fixtures allow us to optimize every project, from design to delivery, with a single point of contact.

All of our products are manufactured in France, at our factories in Comines. Contact us for a quote: send us your blueprint or a photo of your room, and a technical representative will review your request.