The TypeC material saving outer film mold, also referred to as the TypeC material saving external mold, is a specialized precision tool designed for the production of high‑quality Type‑C cable outer films and protective coverings. This mold belongs to the category of material saving molds and incorporates a cold and hot runner system, making it suitable for modern, efficiency‑driven cable manufacturing environments. It is engineered to support high‑volume production while maintaining consistent dimensional accuracy, surface quality, and mechanical performance of the finished TPE (thermoplastic elastomer) parts.

From the perspective of mold classification, this mold can be understood within a broader family of plug molds, wire molds, twisted tooth molds, material saving molds, and hot runner system molds. Specifically, the TypeC material saving outer film mold is primarily a material saving mold with an integrated channel system that combines both cold runner and hot runner technologies. This hybrid structure allows precise control over material flow and temperature, reducing waste while improving filling balance and cycle time.

The core material of the mold is SKD11, a high‑carbon, high‑chromium tool steel widely recognized for its excellent wear resistance, toughness, and dimensional stability after heat treatment. By choosing SKD11, the mold can withstand repeated high‑pressure injection cycles and abrasion caused by continuous flow of TPE materials. This steel grade also provides good resistance to deformation, ensuring that the mold maintains tight tolerances throughout its service life. After machining, the mold components undergo heat treatment to further enhance hardness and wear resistance, thereby extending the operational lifespan to approximately 300,000 cycles under normal production and maintenance conditions.

Surface treatment plays a crucial role in the long‑term performance and aesthetics of this TypeC material saving outer film mold. Various surface treatment options can be applied, including heat treatment, screen printing, coating, and painting, depending on the production requirements and the desired appearance of the mold or associated fixtures. Heat treatment is essential for achieving the specified hardness and stabilizing the microstructure of SKD11. Coating and painting can provide additional corrosion resistance and ease of cleaning, while screen printing can be used to add identification marks, cavity numbers, or reference information to the mold surfaces, facilitating management and traceability in the production environment.

The mold frame is designed to accommodate the specific structure and dimensions of the TypeC material saving external mold, ensuring reliable clamping and compatibility with standard injection molding machines. Although the detailed configuration of the mold frame can vary according to machine specifications and customer requirements, its overall function is to provide rigid support, accurate alignment, and efficient heat dissipation during the molding process. The mold dimensions are approximately 200 mm × 150 mm × 15 mm, a compact size that suits many standard injection machines and allows flexible layout in multi‑mold production lines. Despite the relatively small overall size, careful internal design ensures adequate strength and stiffness to resist deformation under clamping forces.

Regarding cavity design, the mold is configured with 4 cavities (often referred to as 4 points). This multi‑cavity structure increases production output per cycle and improves manufacturing efficiency for Type‑C outer films. Each cavity is engineered to deliver consistent product dimensions and surface finish, ensuring that all molded parts meet the same technical specifications. The range of wire diameter that this mold is designed to accommodate is around 3.5 mm, which is a common size for Type‑C cable applications. By optimizing the cavity profile and the fit around the cable or core, the mold can produce uniform outer films that tightly conform to the wire surface, providing reliable mechanical protection and aesthetic quality.

The plastic material used with this TypeC material saving outer film mold is TPE (thermoplastic elastomer). TPE is selected because it offers flexibility, durability, and good resistance to bending fatigue, which are critical characteristics for Type‑C cables that undergo frequent bending and plugging cycles. Additionally, TPE can provide a pleasant touch, anti‑slip surface, and improved overall user experience. The mold’s gate design and runner system are optimized specifically for TPE flow behavior, accounting for its viscosity, shrinkage, and cooling properties to minimize defects such as short shots, weld lines, or warpage.

In terms of runner and gate design, this mold uses a bilateral feeding, or dual‑side feeding, gate type. Bilateral feeding ensures that the molten TPE is introduced into the cavity from both sides, leading to more balanced filling, reduced internal stress, and a more uniform wall thickness in the final Type‑C outer film. This is especially important in thin‑walled or small‑sized parts where uneven flow can cause deformation or local over‑packing. The channel type combines both cold and hot runner technologies, allowing refined control of material temperature and flow. The hot runner section keeps the TPE in a molten state until it reaches near the gate, which reduces waste of runner material and supports more stable temperature control. The cold runner portion then guides material into the cavity, and can be designed for easy removal and minimal scrap. This hybrid approach balances cost, process stability, and material savings.

The mold lifespan is designed for about 300,000 shots, assuming appropriate processing parameters, machine settings, and routine maintenance are followed. Lifespan is influenced by factors such as injection pressure, processing temperature, TPE formulation, and cleaning procedures. Regular inspection of parting lines, gating areas, and moving components helps maintain product quality over this service life. With proper care, including lubrication of moving parts, cleaning of vents and gates, and controlled storage conditions, the actual number of effective cycles can often reach or exceed the designed lifespan.

Some geometric parameters such as outlet hole size and draft angle are application‑dependent and can be customized according to specific product drawings, tolerance requirements, and assembly conditions with other components of the Type‑C cable. The outlet hole size must be precisely matched to the 3.5 mm wire diameter range while providing enough clearance for smooth demolding and maintaining required sealing or gripping performance of the outer film on the cable surface. Draft angles are typically designed to facilitate easy ejection of TPE parts without causing deformation or surface scratches. Even small changes in draft angle can influence demolding forces, so they are usually determined through a combination of design standards, molding simulation, and practical testing.

The mold’s delivery time is about 15 days under normal conditions. This timeframe covers key stages such as design confirmation, CNC machining, EDM processing, heat treatment, grinding, polishing, assembly, fitting, and trial molding. During this period, 2D original drawings and 3D model images (original and 3D images) are usually developed and refined to ensure that every detail of the TypeC material saving outer film mold matches the user’s technical requirements. 3D modeling allows designers and engineers to validate the runner layout, gate position, cavity balance, and heat dissipation paths, and to foresee potential issues such as air trapping or shrinkage. Once the 3D design is approved, machining can proceed with reduced risk of rework, thereby helping to maintain the promised 15‑day lead time.

The presence of original and 3D images is particularly valuable for communication among designers, process engineers, and end users. These visual resources can include overall mold layouts, sectional views, runner and gate diagrams, cooling circuits, and cavity detail views. They support better understanding of how the TypeC material saving external mold will perform under actual working conditions. Once the mold is assembled, sample molding trials verify dimensional accuracy, surface quality, and functional performance of the TPE Type‑C outer film. Based on feedback from these trials, minor adjustments and optimizations can be made before the mold enters stable mass production.

In practical application, the TypeC material saving outer film mold provides several benefits. The use of SKD11 and appropriate surface treatments ensures a robust and durable structure that withstands long‑term production. The 4‑cavity layout and bilateral feeding design significantly improve productivity and part consistency, while the cold and hot runner system reduces material waste and enhances process control. By aligning the mold design with the characteristics of TPE and the 3.5 mm wire diameter range, the resulting Type‑C outer films can achieve good flexibility, protective performance, and dimensional precision.

Overall, the TypeC material saving outer film mold is a compact yet sophisticated tool tailored for Type‑C cable applications. It integrates SKD11 steel, heat treatment, multi‑cavity configuration, bilateral feeding gates, and a combined cold and hot runner channel system to achieve material saving, high efficiency, and a mold lifespan of about 300,000 cycles. With carefully designed dimensions of 200 mm × 150 mm × 15 mm and a typical delivery time of 15 days, complemented by detailed original and 3D images, this mold provides a reliable, repeatable, and economical solution for producing high‑quality TPE Type‑C outer films in industrial mass‑production settings.