LSR Slider Mold | Mold for Undercut & Complex Geometry Parts | TYM

Slider Mold: The Key Solution for Undercuts and Complex Geometries

When a product design includes features that move against the mold's opening direction — commonly known as "undercuts" — a standard straight pull-open mold cannot demold the part successfully. This is where slider mechanisms come in. A slider mold incorporates internal sliding components that move against the closing direction, automatically performing lateral core-pulling at the moment the mold opens, allowing parts with undercut features to release cleanly.

TYM's slider mold solutions are especially suited for components with difficult geometries and overmolded parts — such as silicone-to-plastic assemblies or products with side holes and bosses. We conduct mold flow analysis and slider motion path design in advance to ensure smooth, interference-free opening and closing.

Key Advantages

● Solves undercuts and side-hole structures that standard molds cannot handle

● Supports overmolding of silicone onto plastic or metal inserts

● Precisely controlled slider motion reduces tearing and flash

● Can be co-designed with thermoplastic mold sections for 2K/overmolding lines

Typical Applications Silicone parts with difficult geometries (undercuts, side holes, bosses) and composite/overmolded components.

Industry	Typical Products
Auto Electronics	Connector housings with side latches/holes, sensor housings, wire harness seals
Consumer Electronics	Phone accessory housings and earbud shells with button holes/side openings
Diving Equipment	Breathing mouthpieces and mask frames with side air-intake holes
PPE / Safety Gear	Goggles and protective face shields with side ventilation holes

 

Slider molds address features on the side of a part relative to the mold's opening direction — holes, latches, external threads, or bosses — using angled pins or hydraulic cylinders to drive lateral core-pulling for demolding. This structure is common in automotive connectors, consumer electronics housings, and diving/PPE products requiring side holes or latches.

 

Applications of LSR Slider Molds for Undercut Silicone Parts

LSR slider molds are used for liquid silicone rubber parts with side holes, undercuts, recessed features, or complex demolding requirements. TYM supports slider mold engineering for silicone phone cases, respirator or mask frame parts, overmolded connector seals, and other complex geometry silicone components.

Silicone Phone Case

A soft-touch protective phone case molded with side sliders to form the precise button cutouts and camera opening along the case's edge. A common consumer electronics accessory, valuedfor its shock-absorbing silicone body and accurate port/button alignment.

PPE Respirator Frame

A 3D-shaped respirator/mask frame molded with side-action sliders to form the lateral valve andvent openings on the part's angled walls. Used in reusable respirator masks and protective facecoverings, where the silicone frame needs to seal comfortably against the face while housing filter or valve components.

Overmolded Automotive Connector Housing

The same overmolded connector housing shown earlier, produced here with slider-mold toolingto release the side latch features and undercuts on the plastic housing after the silicone seal isbonded on. Used in automotive and NEV wiring connectors, combining a secure mechanical latch with a fully sealed, waterproof interface.