Ramen broth is broadly divided into two styles. There is “chintan,” a beautifully transparent broth that preserves the umami of the ingredients without becoming cloudy, and “rich paitan,” a creamy broth in which bone marrow and fat dissolve completely into the liquid.
Traditionally, making both styles in the same kitchen meant lining up several different stockpots over different heat levels and monitoring each one for hours using completely different approaches. But in the world of commercial pressure cookers (boiling point 120°C), the control between a transparent broth and a cloudy broth doesn’t depend on a chef’s lifetime of intuition — it’s controlled purely by physics: “pressure (atmospheric force)” and “depressurization (valve operation)” — and one single machine can sort the two perfectly.
In this article, we apply the science of pressure cooking to explain — scientifically — how professionals extract chintan and paitan exactly as intended, at the highest possible quality.
What Exactly Is the Difference Between Chintan and Paitan? The Science of Broth Cloudiness
Why does a broth stay “transparent,” and why does another turn “cloudy and creamy”? The keys are the “gelatin (collagen)” and “fat” dissolved in the broth, plus the “convection (intensity of boiling)” inside the pot.
Chintan Mechanism: Encapsulating and Separating the Fat
A chintan broth dissolves only the umami compounds (amino acids and nucleotides) into the water. The fat released from the bones doesn’t mix into the water — instead, it floats on the surface as an independent “aroma oil,” which is how transparency is preserved. When the pot interior is heated quietly around 100°C, the fat droplets remain large and continue to float on the surface. In addition, as proteins released from meat and bones coagulate, they trap tiny suspended particles inside the broth and form “aku (scum),” which makes the broth even clearer.
Paitan Mechanism: Water and Oil Fuse Tightly Through “Emulsification”
In contrast, paitan is born through a phenomenon called “emulsification.” Violent boiling vibrations rip the surface fat into “particles too small to see.” Then the gelatin (a natural emulsifier) released abundantly from the bones coats those tiny fat particles, fully fusing water and oil and transforming the broth into a brilliantly white, creamy paitan.
Valve Operation for Pulling Crystal-Clear Chintan in the Shortest Time with a Pressure Cooker
Master the “speed at which you open the exhaust valve,” and you can extract an extraordinarily clear chintan in a far shorter time than a conventional stockpot allows.
Step 1: Pressurize Briefly at a “Low Pressure” of 0.13–0.15 MPa
For chintan preparation (chicken chintan or high-grade pork chintan), our largest-capacity 130L model (0.13 MPa) and 110L model (0.15 MPa) — with their carefully tuned low-pressure design — deliver outstanding results. Without over-pressurizing, the broth is fully cooked under pressure in just about 45–60 minutes. Because the chamber is sealed, the delicate aroma compounds (volatile aromatics) of the ingredients cannot escape as steam — they are all trapped inside the broth.
Step 2: The Most Critical Step — “Natural Depressurization (Silent Discharge)”
This is the single most important professional technique for a successful chintan. After the timer rings and the heat (gas) is switched off, do not open the exhaust valve all at once. Keep the exhaust valve closed, or open it only ever so slightly, and wait for the internal temperature and pressure to drop naturally (about 20–30 minutes). If you crack the valve open suddenly under high pressure, the internal pressure crashes, the broth instantly explodes into boiling (a flash phenomenon), agitates violently, and ends up completely cloudy. By turning off the heat and letting pressure drop quietly, the pot interior is kept in a state with “not a single droplet of convection — completely still.” During this time, fat in the broth rises cleanly to the surface, and the microscopic particles that would otherwise add off-flavors settle on the bottom and walls.
How to Automatically Hammer Out Maximum-Emulsion Paitan with a Pressure Cooker
Conversely, when you want to make a paitan — a rich chicken paitan or a viscous tonkotsu-seafood broth — the pressure cooker transforms into, literally, “the strongest emulsifying machine.”
Step 1: Gelatinize Collagen to Its Absolute Limit at Maximum Pressure
For paitan-based preparation, use a high-pressure model such as the 50L (0.3 MPa) or 90L (0.2 MPa) and pressurize firmly for 90–120 minutes. Hot water at over 120°C completely breaks down the collagen contained in chicken cartilage, pork bones, and skin, and releases “gelatin” — a powerful natural emulsifier — into the broth at concentrations several times higher than a conventional stockpot can achieve.
Step 2: Trigger Flash Emulsification with “Rapid Depressurization”
The moment cooking is complete, open the exhaust valve at full. The pressure inside the pot is released instantly, and the broth — which has been at nearly 120°C — flashes into violent boiling (a sudden boil). The explosive convection energy this generates forcibly and instantly agitates the fat and the abundant gelatin in the broth.
Step 3: Lock In the Emulsion with “Shear Force” During Liquid Transfer
To finish, connect the dedicated transfer hose to move the broth into a separate container. Using the small amount of residual pressure inside the pot, as the broth passes through the narrow valve and hose at high pressure, “shear force” (the force that tears liquids apart) acts on it. This further breaks the fat particles down to micron-scale and binds them tightly with the gelatin. The paitan that results never separates back into water and oil — not even when chilled, not even after an overnight rest.
A “Hybrid Kitchen Workflow” — Running Both Chintan and Paitan with a Single Pressure Cooker
Once you understand these two techniques (natural depressurization and rapid depressurization), the kitchen operation of a ramen restaurant becomes dramatically smarter. By simply changing the settings and valve operation on a single pressure cooker, you can finish both styles to perfection in under three hours before opening.
| Time Slot | Cooking Menu | Pressure / Time Setting | Valve / Depressurization | Resulting Broth |
|---|---|---|---|---|
| AM 8:00 | Lunch service: Aromatic Chicken Chintan | 0.13 MPa / 50 min | Natural Depressurization (30 min rest) | A golden, perfectly transparent premium chintan with aroma sealed in by the steam. |
| AM 9:30 | Dinner / Limited: Rich Chicken Paitan | 0.20 MPa / 90 min | Rapid Depressurization + Liquid Transfer | A fully and automatically emulsified creamy paitan — without crushing a single bone. |
Conclusion: Control Physics to Create the Ideal Broth
The choice between chintan and paitan is never determined by a chef’s “willpower” or by “length of simmering” alone. It is all science — explained by the temperature, atmospheric pressure, and the physical balance between water and oil (emulsification theory) happening inside the pot.
The commercial pressure cooker is, in effect, “a precision-control infrastructure for broth” — letting you freely command that physical environment (the speed at which pressure escapes) with a single valve.
If you are a professional who has thought “I want to extract my chintan recipe in one hour without it going cloudy,” or “I want to make a paitan that is creamier and more stable than the one I’m pulling now with a conventional stockpot,” please come experience the difference at Kitchen Techno’s test kitchen. With a single valve operation, the character of the broth changes completely — we will show you the true power of pressure cooking.