Application Focus

Food Machinery

Creating a hardened, hygienic, and corrosion-resistant surface to prevent bacterial entrapment and withstand aggressive daily sanitization.

The Challenge and Solutions

In food processing environments, machinery is subjected to constant cleaning cycles using aggressive sanitizing agents, steam, and hot water. These conditions lead to rapid surface oxidation and wear in moving parts. Furthermore, scratching on contact surfaces creates "traps" for bacteria.

Shital Plasma Nitriding creates a hardened, hygienic surface that is both wear-resistant and highly resistant to chemical corrosion, ensuring full compliance with stringent sanitation requirements [1].

Food Machinery 1 Food Machinery 2 Food Machinery 3

How We Solve Food Machinery Challenges

Problem Faced Mechanism of Plasma Nitriding Solution
Scratch Mark Significantly increases surface hardness, preventing galling and scoring on sliding contact surfaces, which minimizes the risk of food particle entrapment.
Wear & Tear Provides a robust, hardened diffusion layer that extends the life of high-speed processing components, such as blades, impellers, and conveyor drive parts.
Surface Corrosion Forms a chemically inert nitride layer that resists pitting and rusting caused by cleaning detergents, food acids, and moisture exposure during daily wash-downs.

Material Specifications for Food Machinery

For food-grade machinery, stainless steel is the standard. Plasma nitriding is specifically effective on these grades because it improves surface hardness (which is naturally low in stainless steel) without compromising the corrosion resistance required for hygienic standards.

Material / Grade Application Area Target Surface Hardness Recommended Case Depth
Stainless Steel (304 / 316) Food Contact Surfaces & Valves 900 – 1100 HV 0.05 – 0.15 mm
Stainless Steel (420 / 431) Cutting Blades & Scrapers 950 – 1150 HV 0.10 – 0.20 mm
PH Stainless (17-4 PH) High-Load Structural Parts 950 – 1100 HV 0.10 – 0.20 mm
AISI 4140 / 4340 Non-Food Contact Gearboxes 650 – 800 HV 0.20 – 0.40 mm
Note: In the food industry, compliance is key [1]. We perform specialized vacuum-based plasma nitriding to ensure the surface is clean, smooth, and free of porous "white layers" that could harbor bacteria, ensuring your machinery meets strict sanitation requirements [1].