Cleaning: more than just chemistry
Cleaning does not depend on just one parameter. All parameters (chemistry, temperature, time and force) are essential. And they are all interacting.
Costs are rising
When a contamination problem occures in the production, often only the type of cleaning agent and/or temperature of a cleaning step is changed. Sometimes it solves the issue, sometimes it doesn't. To solve the issue, most of the time however, more expensive cleaning agents and higher temperatures are chosen. As a result, cleaning costs are rising.
Keep in mind that the effectiveness of cleaning is based on several parameters. Apart from chemistry and temperature, also the time of a cleaning step, and the flow (mechanical force) could be changed. The flow of the cleaning liquid is responsible for bringing the cleaning agents and their tempeature onto the dirt and the surfaces. It is also responsible for removing the dirt out of the installation. Increasing the flow leads to more turbulence and a higher shear stress at the surface, resulting in faster cleaning. But there is more...
Pulsed flow cleaning
Several investigation groups are performing research on CIP tests using pulsed flow, both in simple installations (eg tubes) as in complex instruments (eg scraped surface heat exchangers). The tests have been positive. By pulsating the flow of the cleaning liquids, the dirt in the installation is experiencing more shear stress, and is more easily removed. Some investigations show a similar cleaning effect in only half the required time. Less cleaning time means more available production time, and is thus always interesting.