Scraped Surface Heat Exchanger for Cosmetic Pasteurization
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Solution Overview
Problem
Existing methods for pasteurizing cosmetic compositions, such as ultra-high-temperature pasteurization, often result in significant changes to moisture content, affecting product stability and usability, especially for high-viscosity compositions and those without preservatives.
Innovation Solution
The use of a scraped surface heat exchanger (SSHE) for ultra-high-temperature pasteurization, which maintains the moisture content of cosmetic compositions by achieving a temperature of 130-150°C while minimizing thermal shock and ensuring sufficient pasteurization time, combined with a heat insulation tube to maintain the temperature and ensure thorough pasteurization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If infusion-type ultra-high-temperature pasteurization is used to pasteurize cosmetic compositions, then microorganisms are eliminated and preservability is improved, but moisture content changes significantly affecting product stability and usability
Solution Approach 1:
The patent introduces a scraped surface heat exchanger as an intermediary device that enables indirect heat transfer through metal surfaces. The cosmetic composition is heated by contact with heated surfaces and then rapidly cooled, eliminating the need for direct steam infusion. This intermediary heat exchange mechanism prevents moisture addition while achieving the required pasteurization temperature of 130-150°C.
Solution Approach 2:
The patent replaces the steam infusion mechanism with a mechanical scraped surface heat exchanger system. Instead of using steam to heat the cosmetic composition, the system uses mechanically scraped surfaces that conduct heat efficiently. This substitution eliminates the moisture transfer problem while maintaining effective pasteurization through controlled thermal exposure.
2Reliability
If ultra-high-temperature pasteurization is applied to high-viscosity cosmetic compositions, then microorganisms are eliminated, but the viscosity limitation prevents effective infusion at preheating temperature
Solution Approach 1:
The scraped surface heat exchanger acts as an intermediary that does not require the cosmetic composition to be in a low-viscosity state for effective heat transfer. The mechanical scraping action ensures continuous contact with heated surfaces regardless of viscosity, enabling effective pasteurization of high-viscosity compositions that cannot be processed by infusion methods.
Solution Approach 2:
The patent changes the heat transfer parameter from diffusion-based (steam infusion) to conduction-based (surface contact). This parameter change allows the system to handle a wide range of viscosities because the heat transfer efficiency depends on surface contact quality rather than fluid flow characteristics, making the process adaptable to high-viscosity cosmetic compositions.
3Use of energy by moving object
If direct steam infusion is used for pasteurization, then heating efficiency is high, but the cosmetic composition is directly exposed to steam causing moisture content change
Solution Approach 1:
The patent segments the heating process into two distinct stages: heating in a heat exchanger and cooling in a separate cooling section. This segmentation prevents steam from directly contacting the cosmetic composition during heating, while maintaining high heating efficiency through the heat exchanger's thermal conduction. The moisture content is preserved because the cosmetic never exposes to steam directly.
Solution Approach 2:
The heat exchanger surfaces serve as intermediaries that transfer thermal energy from steam to the cosmetic composition without allowing direct contact between steam and the product. This intermediary mechanism maintains high heating efficiency through effective thermal conduction while preventing moisture addition, resolving the contradiction between heating efficiency and moisture preservation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively pasteurizes cosmetic compositions with various physical properties, including high-viscosity ones, without altering the moisture content, ensuring temporal stability and eliminating microorganisms, while avoiding the use of preservatives.
Implementation Method 1
passing a cosmetic composition through a scraped surface heat exchanger (SSHE) such that an ultra-high-temperature pasteurization temperature of 130-150° C. is reached
Implementation Method 2
pasteurizing the cosmetic composition as the cosmetic composition is passed through a heat insulation tube while maintaining the ultra-high-temperature pasteurization temperature
Data Source
AI summary
The present disclosure relates to a method for ultra-high-temperature pasteurization of a cosmetic composition using a scraped surface heat exchanger (SSHE), a method for preparing a pasteurized cosmetic composition using the method, and an ultra-high-temperature pasteurized cosmetic composition maintaining a moisture content prior to the pasteurization. According to the present disclosure, a cosmetic composition having various physical properties can be economically pasteurized in short time without change in a moisture content.