Laundry Sterilization by Dry Hot Air Before Low-Temperature Washing
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Solution Overview
Problem
Conventional washing and drying processes for delicate laundry fail to effectively sterilize without damaging the materials, as high temperatures can cause discoloration, color transfer, and require excessive energy, and existing designs for combined washing and drying units are not market viable.
Innovation Solution
A method where temperature-sensitive laundry is exposed to a controlled air flow at a defined temperature in the dry state for a specified time, then cooled to a reduced target temperature before washing, utilizing a washing-drying unit with a control device to manage the process, preventing water-related damage and optimizing energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laundry items are washed at high temperatures to sterilize, then sterilization effectiveness is improved, but fabric damage and color loss occur
Solution Approach 1:
The patent applies preliminary sterilization by exposing laundry items to hot air flow at temperatures between 60-95°C for 5-30 minutes before the washing process. This preliminary thermal treatment kills microbes and opens fabric pores, enabling effective sterilization without requiring high-temperature washing that would damage delicate fabrics.
2Reliability
If laundry items are dried with hot air after washing to sterilize, then sterilization is achieved, but energy consumption increases and fabric damage occurs
Solution Approach 1:
The patent performs sterilization as a preliminary step before washing, eliminating the need for subsequent high-temperature drying for sterilization purposes. By sterilizing the laundry before washing, the process avoids the energy-intensive hot air drying phase while achieving the same sterilization effect.
3Reliability
If laundry items are dried with hot air after washing to sterilize, then sterilization is achieved, but fabric damage worsens due to damp state sensitivity
Solution Approach 1:
The patent reverses the conventional sequence by performing sterilization before washing when the fabric is in its strongest dry state. This preliminary sterilization exposes the fabric to thermal stress when it is most resistant, avoiding the harmful combination of dampness and high temperature that occurs in conventional drying-after-washing processes.
4Object-affected harmful factors
If laundry items are washed at low temperatures to protect fabric, then fabric protection is improved, but sterilization effectiveness decreases
Solution Approach 1:
The patent applies preliminary sterilization treatment at elevated temperatures (60-95°C) for 5-30 minutes before the low-temperature washing process. This preliminary thermal exposure ensures effective microbial killing, allowing the subsequent washing to be performed at lower temperatures that protect delicate fabrics from damage.
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 sterilizes delicate laundry with minimal material damage and reduced energy consumption by avoiding high-temperature water exposure, ensuring color preservation and efficient heat utilization in the subsequent washing process.
Implementation Method 1
the laundry items are exposed, in the dry state, to a process air flow over a specified time period at a defined temperature
Implementation Method 2
the laundry items heated in this way are cooled to a target temperature which is significantly reduced in comparison with the defined temperature
Data Source
AI summary
The method according to the invention for sterilizing temperature-sensitive laundry items comprises the following steps: in the dry state, the laundry items are exposed to a process air flow having a defined temperature Tp and over a specified time period, then the laundry items heated in such a way are cooled to a target temperature Tptarget significantly lower than the temperature Tp, and then the cooled laundry items are washed in a washing process. The washing-drying unit according to the invention has a control device (CTRL) for carrying out said method.