Patent ID: 11873203
Assignee: DAI NIPPON PRINTING CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B  F  A | IPC B

Claim 0:
1. A cleaning method of a heat sterilization system comprising a plurality of heating sections, connected to each other in series for heating a content, each heating section having a heating pipe with a fluid inlet and a fluid outlet, the cleaning method comprising:
a step of causing a fluid including at least a cleaning liquid to flow through the heating pipe of each heating section so as to clean an inside of the heating pipe of each heating section;
a step of heating the heating pipe of each heating section from outside by means of a medium;
a step of measuring fluid temperatures of the fluid including at least the cleaning liquid at the fluid inlet and the fluid outlet of the heating pipe of the heating section which is positioned most downstream among the heating sections;
a step of measuring medium temperatures of the medium at a medium inlet and a medium outlet of the heating section which is positioned most downstream among the heating sections; and
a step of calculating an overall heat transfer coefficient of the heating pipe of the heating section which is positioned most downstream among the heating sections and monitoring the increasing overall heat transfer coefficient in a case where the fluid including at least the cleaning liquid is caused to flow through the heating pipe of the heating section which is positioned most downstream among the heating sections and the medium is caused to flow outside the heating pipe of the heating section which is positioned most downstream among the heating sections, based on the fluid temperatures at the fluid including at least the cleaning liquid at the fluid inlet and the fluid outlet of the heating pipe of the heating section which is positioned most downstream among the heating sections and the medium temperatures of the medium at the medium inlet and the medium outlet of the heating section which is positioned most downstream among the heating sections.