Plastic Pipe Fitting Mold LP | Spark Mould

The chain-type collapsible core divides the curved internal geometry into multiple interlocking segments (sliders) guided by precision tracks. During the molding phase, these segments tightly assemble to form a rigid, curved core pin. Upon ejection, the segments collapse sequentially and are pulled out smoothly along the internal contour of the pipe fitting wall.

1.Space-Optimized Layout: All moving components actuate along the longitudinal axis, significantly saving mold space and allowing for a more compact mold base design. 2.Simplified Mechanics: It operates without complex external transmission gears or bulky rotary drive mechanisms, reducing maintenance overhead and tooling failure rates. 3.Ideal for Long Straight Tangents: It is exceptionally well-suited for 90-degree elbows featuring extended straight sections, ensuring seamless, friction-free linear extraction during the molding cycle.

This configuration utilizes an arc-shaped rotary core shaft actuated by hydraulic cylinders or rack-and-pinion gear systems. During the mold opening and closing sequences, the core shaft swings smoothly along a strict circular trajectory to release the internal curved profile.

1.Flawless Internal Surface Finish: Because this mechanism utilizes a solid, monolithic core pin rather than multi-segmented sliders, it completely eliminates the slight seams or witness lines inherent to collapsible cores, producing a perfectly smooth internal wall that optimizes fluid dynamics. 2.Smooth Kinematic Trajectory: Actuating along a strict circular path eliminates localized stress concentrations and prevents deformation on the freshly molded plastic. 3.Challenges with Straight Tangents: While highly effective for sweeping bends, this architecture becomes technically difficult to implement for 90-degree elbows that require extended straight sections.