Application Focus

Plastic Moulding Dies

Creating highly smooth, low-friction, and wear-resistant diffusion layers to prevent polymer adhesion, combat abrasive fillers, and protect precision parting lines.

The Challenge and Solutions

In plastic injection moulding, your tooling faces constant exposure to abrasive polymer fillers (like glass fiber), corrosive gases released during resin melting, and the need for precision parting lines. Over time, these factors lead to mold degradation, resulting in costly part defects and increased cycle times due to sticking.

Shital Plasma Nitriding modifies the tool steel surface to provide a superior, low-friction, and hardened barrier that protects your mold integrity and ensures efficient part ejection.

Plastic Moulding Die 1 Plastic Moulding Die 2 Plastic Moulding Die 3 Plastic Moulding Die 4

How We Solve Your Plastic Moulding Challenges

Problem Faced Mechanism of Plasma Nitriding Solution
Sticking of Plastic Creates a highly smooth, low-surface-energy diffusion zone that reduces the adhesion of molten polymers, ensuring reliable part release.
Flash Groove Increases the surface hardness of shut-off areas, preventing the "peening" or deformation that leads to plastic flash and dimensional inaccuracies.
Abrasion Hardens the cavity and core surfaces to withstand the scouring effect of abrasive materials, such as glass-filled or mineral-filled plastics.
Anti Carbon Layer Inhibits the accumulation of burnt polymer residues and gas deposits, keeping the mold surface clean and maintaining aesthetic surface finishes.
Corrosion of Dies Creates a robust barrier against acidic gases (such as HCl released by PVC or other flame-retardant resins) that typically cause pitting and degradation.

Material Specifications for Plastic Moulding

Plastic moulding uses a wide range of tool steels. Plasma nitriding is highly effective at boosting the performance of these materials, particularly for long-run production or when processing abrasive/corrosive engineering resins.

Material / Grade Application Area Target Surface Hardness Recommended Case Depth
P20 (1.2311 / 1.2312) Mould Bases & Cavities 750 – 900 HV 0.20 – 0.35 mm
H13 (1.2344) High-Wear Cavity Inserts 950 – 1100 HV 0.15 – 0.25 mm
S7 (1.2357) Slides & Moving Components 850 – 1000 HV 0.20 – 0.30 mm
Note: For plastic moulding, we prioritize maintaining the precise surface finish (texture) of your mold. Our plasma nitriding process is conducted at temperatures that avoid altering the base dimensions of the tool, ensuring your high-precision textures remain intact.