Conching is kneading, shearing, and aerating of chocolate mass
Skip to content
Home » Conching

Conching

What is Conching?

Conching is a critical technological process in chocolate production, involving continuous mixing, kneading, shearing, and aerating of chocolate mass under controlled conditions. Its primary purpose is to refine particle distribution, reduce viscosity, eliminate unwanted volatile compounds (such as acetic acid), evenly coat cocoa solids with cocoa butter, and enhance flavor development through controlled oxidation and heat treatment. This process transforms gritty, coarse cocoa mass into a smooth, homogenous product with desirable texture, gloss, and melt-in-mouth quality. Conching is carried out in specialized equipment known as conches, which may operate with longitudinal, rotary, or rotary-paddle mechanisms, depending on production scale and required chocolate characteristics.

Food products where conching is used

It is an essential step in nearly all high-quality chocolate recipes, ensuring stable viscosity for molding, enrobing, or coating and improving shelf life and sensory quality.

Technical parameters of the conching process

Conching is generally performed at temperatures between 45 °C and 80 °C. Dark chocolate often requires higher temperatures and longer mixing (up to 48–72 hours in traditional systems, though modern intensive conches can complete the process in 6–12 hours). Milk and white chocolates are processed at lower temperatures to prevent caramelization of milk solids and loss of delicate flavors. The process typically progresses through three stages: dry conchings (moisture removal, acid evaporation), pasty phase (particle coating with fat, flavor development), and liquid conching (viscosity reduction, emulsifier incorporation). Lecithin or polyglycerol polyricinoleate (PGPR) is often added during the final phase to optimize flow properties.

Common technological problems and solutions during conchings:

  • Excessive viscosity: Often caused by insufficient fat or improper emulsifier addition. Solution: adjust cocoa butter content, incorporate lecithin at the final stage, or correct moisture levels.
  • Overheating: Leads to burnt flavors, fat degradation, or caramelization of milk solids. Solution: strictly monitor temperature and use modern conches with cooling systems.
  • Underconching: Results in poor flavor release, acidic notes, or gritty texture. Solution: extend conch time, improve aeration, and ensure adequate shear force.
  • Fat bloom after storage: May occur if conching does not achieve proper dispersion of cocoa butter. Solution: ensure complete fat coating of particles and combine with proper tempering.
  • High energy consumption: A common industrial issue due to long processing times. Solution: use modern intensive conching systems, optimize batch sizes, and control input energy.

Conchings are defining processes in chocolate manufacturing, directly responsible for the sensory and functional quality of the final product, and continues to evolve with advancements in machinery and energy efficiency.

You can find more information about conching in the articles below.