Choices and using of washing machines in Chinese households

Rapid urbanization and improvement in living standard skyrocket the demand for washing machines in Chinese households, especially in urban households. This paper discusses the owning rate of different types of washing machines, using frequency, load capacity, factors affect choices of washing machines, etc. in Chinese households and suggest possible strategies in choosing washing machines considering economic expenditure. Quantitative information relates to choice and use of household washing machines was collected through in‐depth interview of the key person who carried out household laundering. A total of 993 households that were randomly selected in eight provinces and a municipality were successfully interviewed. Impeller washing machine is still in a dominate place whereas drum washing machine increasing steadily. Households with higher income tend to buy drum washing machines for their better performances in detergency and superior quality. Load capacity between 4 and 6 kg is very common at present. Larger load capacity is a trend of washing machine choices in Chinese households. Washing machine with better energy efficiency is more popular for its lower expenditure in use. This is more obvious for drum washing machine. Washing machines are often used once every 1 or 2 days in summer, whereas one wash per week and two washes per week are very common in winter. Consumer will expend much more money with the choice of a drum washing machine, not only for paying for the machine, but also for the consumed electricity and water and wastewater discharges in every use.     

THE EFFECT OF DETERGENT TYPE AND LAUNDERING TEMPERATURE ON THE SOIL REMOVAL AND SOIL REDEPOSITION PERFORMANCE OF COTTON AND P/C BLENDS WITH AND WITHOUT DURABLE PRESS FINISH

Three soiled test cloths of cotton and 65/35% Dacron/cotton blends with and without durable press finish were subjected to twenty-five repeated launderings in Launder-Ometer to determine the effect of fabric type, wash temperature, and laundering interval on the soil removal and soil redeposition performance. The reflectance of the test fabrics as measured by a Hunter Lab D-40 reflectometer and the amount of soil removed and redeposited was computed in reflectance unit (RU) expressing the difference in reflectance of the test samples before and after washing. Soil removal and redeposition performances were significantly influenced by fabric type, detergent type, and laundering interval. Duncan's multiple range test indicated that Dacron/cotton blends with and without durable press finish retained and redeposited significantly less soil than cotton. Powder detergents cleaned test fabrics better than liquid detergents. Highly significant correlations between soil removal and redeposition RU and whiteness measurements were found. Therefore, both computations serve as reliable methods to evaluate soil removal and redeposition performance.     

Consumer laundry practices in Germany

Sustainability is a guiding principle for a responsible, future‐oriented 21st century lifestyle and this already begins in private households with the daily household tasks. Approximately 25% of an average household's electricity consumption is required to do the laundry and dishwashing – 5% alone is for washing clothes with a corresponding energy consumption of 6 billion kilowatt hours. In addition, 600 000 tonnes of detergent and 330 million cubic metres of water are used for textile care in Germany. These figures provide the rationale for the scientific study of current practices of using washing machines and for a resulting estimate of the latent energy‐saving potential in German households. In the context of the in‐home study presented here, 236 private households throughout Germany were studied with respect to their washing practices and existing knowledge about topics on the sustainable, energy‐saving use of their washing machines. Overall, across all households 2867 wash cycles were individually recorded and subsequently analysed over a 4‐week period. The results of this study show that washing machines tend to be underloaded, and therefore maximum loading of the machines could lead to a reduction of wash cycles per household. With respect to detergent dosage, it was determined that the consumer does not adjust the dosage to the textile type, load size, soil level and/or water hardness, and this can lead to under‐ or overdosing depending on prevailing conditions. Finally, the selection of the wash temperature showed a 90°C/95°C programme was only chosen in 2.3% of all recorded wash cycles, however, every fourth cycle was completed at 60°C. Therefore, adjusting the load size and detergent dosage as well as selecting the right wash temperature are key themes to be taken into account in future consumer communication about energy‐saving households.     

An investigation into aspects of energy labelling with special reference to washing machines

The purpose of this research was to investigate whether the performance of domestic washing machines is adversely affected by reduced levels of energy use. This was felt particularly worthwhile because of the introduction of energy labelling for washing machines in April 1996. Results were determined by conducting tests derived from BS EN 60456. This research also aimed to discover consumer awareness of energy labelling and factors likely to influence the future purchase of washing machines. The results indicate that washing performance may be adversely affected by lower levels of energy consumption and that washing machines with a higher energy consumption achieve a better washing performance. From the survey carried out, it was discovered that the most influential factors when purchasing a washing machine were price, washing performance and brand reliability. Environmental factors such as reduced energy consumption and reduced water consumption only played a minor role in consumers' considerations. However, the research indicates that consumers' decisions may, in the future, be affected by the information displayed on energy labels.     

Manual dishwashing process – a pre‐assigned behaviour?

Global studies have observed many techniques of manual dishwashing causing different levels of performance and using quite different amounts of water, energy, time and detergent. It is not known, however, if these techniques are pre‐assigned to a person and persist when dishes are washed under different conditions, or are adapted to the specific type of dish‐cleaning process. Here we explored this question in a study with 40 test subjects selected equally from Germany and East European countries by asking them to wash two place settings of dishes with different amounts of soil three times. The results showed that the test subjects did not adapt their washing‐up behaviour to the amount of soil. In general, no significant differences were found in the water, energy and detergent consumption for all test subjects. Only the time used by the German test subjects to wash the fully soiled dishes was significantly longer compared with the dishes with only a quarter the quantity of soil, and no significant difference was observed for all other parts. The only significant difference found between the level of soiling of the dishes was the cleaning result achieved: The less soiled the dishes were, the better the final cleaning result was, and this related to all test subjects. This lends support to the proposition that the consumers did not adapt their washing‐up behaviour to the specific circumstances of the dishwashing job to be done but retained some pre‐assigned behaviour.     

Relationship of wash/rinse water temperatures to soil removal

Samples of cotton, polyester and nylon fabrics were soiled by application of synthetic sebum and clay and then laundered at various combinations of hot, warm and cold wash and rinse water temperatures. The temperature of the rinse water did not affect the amount of soil removed from the fabrics. More soil was generally removed with hot wash water than with warm or cold water. The soil was more readily removed from the nylon than from the cotton or polyester fabrics. All wash/rinse treatments removed soil to a level that would probably be acceptable to most consumers.     

Clean laundry with pure conscience—A study on laundry practices among Finnish consumers

The previous study concerning laundry practices in Finland was published 16 years ago. Since that time, many pro‐environmental debates have been going on and sustainable actions have been implemented in many areas of individual lives and households. The purpose of this study is to investigate the textile laundering practices of Finnish consumers and their attitudes toward clothing care procedures. This study discusses how laundry habits could be developed into a more sustainable direction. The data for this research were gathered through an online enquiry that consisted of structured multiple‐choice questions. The data were obtained from 1,841 persons of whom 97.5% were women (n = 1,795). The data were analyzed by statistical means using the SPSS program. The data show that, despite media attention and debate about textile care procedures, there still are factors in laundering that burden the environment. From a sustainability point of view, some improvements exist when comparing to the situation 16 years ago, but washing machines still are seldom filled to their full capacity and consumers, being unaware of water hardness, administer excessive amounts of detergent. The current life situations of the household members seem to be major factors influencing laundry habits and sustainable actions. Especially, young people and families with children would benefit from information and instructions on laundry practices. Topics could contain knowledge about water hardness and proper dosing of detergent, filling the washing machine, washing temperatures, drying methods, and saving energy. Furthermore, general promotion of gender equality is important because household work and laundering is strikingly women‐performed work.     

A survey of commercial laundry detergents – how effective are they? Part I: powders

The effectiveness of 11 non-phosphate containing powdered detergents and 12 phosphate containing powdered detergents, of varying formulations, in cleaning a standard soiled fabric in soft water (5 ppm) were evaluated. It was found that in soft water there were no differences between washing with either phosphate or non-phosphate detergent. In general, washing with detergents which contained phosphates did give somewhat better results in warm water. Detergents that contained bleach as an additive did not result in a whiter fabric.     

A survey of commercial laundry detergents - how effective are they?: Part III: powders,liquids and hard water

The effectiveness of 42 detergents, 11 non-phosphate containing powdered detergents, 12 phosphate containing powdered detergents, 11 unbuilt liquid detergents and eight built liquid detergents, of varying formulations, in cleaning a standard soiled fabric in water of varying hardness was evaluated. Powdered detergents were found to be significantly affected only at very high water hardness levels. There was no significant difference between washing in warm and hot water for the liquid detergents, except for a melaleucaoil based detergent which performed significantly better in hot water. Increasing water hardness had no significant effect on liquid detergents. Powdered detergents performed better than liquid detergents in cleaning the standard soiled fabric. While no one detergent was significantly better than the others, in general, washing with detergents that contained phosphates did give somewhat better results in warm water. Detergents that contained bleach as an additive did not result in whiter fabric.     

Bacterial survival on fabrics laundered in cold water

The effect of detergent formulation and fabric type on bacterial survival after home laundering in cold water was investigated. Three fabrics, 65/35 polyester/cotton shirting, 100% cotton sheeting, and 100% cotton terry cloth, were inoculated with Staphylococcus aureus, laundered in cold 60 ± 5°F (16 ± 3°C) water and machine dried. Eight phosphorus-based powders and non-phosphorus detergents in both powder and liquid form were used. A control with no detergent was used. Percent reduction in bacteria after machine washing and after machine drying were determined. Of the eight detergents studied, only two effectively removed 100% of the bacteria from the cotton terry cloth after washing. These were sodium carbonate and aluminosilicate-based powders, one of which contained sodium perborate, the other included enzymes. All of the detergents used removed > 97% of bacteria from the polyester/cotton shirting and cotton sheeting fabrics. No significant cross contamination occurred with any fabric. A greater percent reduction of bacteria was obtained with the terry cloth samples after washing and tumble drying than after washing alone. The implications of the study are important for consumers who are using colder water in the laundering process. This study found that bacteria were removed more easily from the two plain weave fabrics than the looped terry cloth fabric. The effectiveness of tumble drying after cold water laundering to reduce bacteria in the terry cloth towelling was an important finding.     

The adoption of sustainable laundry technologies by US consumers

The adoption of sustainable laundry technologies by US consumers has lagged behind that of other countries and even behind the projections for adoption made by the US government. Most US household currently own and use the top‐loading vertical axis (v‐axis) agitator type washers, which use large amounts of water as well as additional energy to heat the water. More sustainable laundry practices include the use of energy‐ and water‐efficient front‐loading horizontal‐axis (h‐axis) washers. These washers have been demonstrated to use 38% less water and 58% less energy than the standard top‐loading v‐axis models. The adoption of more energy‐efficient washing technologies is of interest to many, including policy makers, because of their water‐ and energy‐saving potential. Little is known about the attributes and issues consumers use in their decision to adopt high‐efficiency washers for their home. This study uses Roger's Diffusion of Innovations Theory to understand the adoption of h‐axis washers by US consumers. An online survey of 330 consumers who own washing machines found that 23% currently own h‐axis washers and 24% of consumers intend to purchase an h‐axis when they replace their top‐loading vertical (v‐axis) washers. Energy and water savings are the most frequently cited reasons overall for adopting the h‐axis washer and cost was the main reason for not adopting the technology. Other issues, such as dissatisfaction with cleaning power and problems with machine cleanliness and maintenance, did not play a major role in adoption. Specific marketing and education channels, where US consumers are looking for information about h‐axis washers, are also identified. Overall, the results suggest that the rate of h‐axis adoption in the US is accelerating, but that many of the benefits of the technology are not easily observed by non‐owners.     

基于PLC的全自动洗衣机控制系统的设计

洗衣机是大家非常熟悉的一种家用电器,随着科技的进步和人们生活质量的提高以及人们对精神文明的高度追求,全自动洗衣机也揭开了面纱,它以其固有的优点赢得了很多的消费者的信赖,有必要开发和改善现有的全自动洗衣机.根据全自动洗衣机的工作原理,利用可编程控制器实现PLC控制.说明了PLC控制的原理方法、特点及其特色!     

Manual dishwashing habits: an empirical analysis of UK consumers

This study presents an overview of the washing up behaviour of consumers in the UK. Peoples' individual attitudes were observed as were the amount of water and energy used, the time taken and the cleaning performance. Additionally, manual dishwashing was compared with the use of automatic dishwashers. Participants were recruited to represent all geographic regions of the UK as well as forming a representative cross‐section of the population. Each of the 150 participants washed a full load of soiled tableware based on the standard EN 50242 ‘Electric Dishwashers for Household Use – Methods for Measuring the Performance’. For comparison, the best selling dishwasher in the UK in 2007 was tested under the same conditions as those in the consumer trial. Additionally, consumers who owned a full‐size dishwasher were asked to load it to the point when they decided that the dishwasher was full. The study shows that these consumers, on average, used 49 l of water and 1.7 kWh of energy, whereas the dishwasher used 13 l of water and 1.3 kWh of energy on average for the same amount of dishes under the conditions tested. Statistical analysis showed that these differences are significant. The dishes washed by hand were found to be slightly less clean than dishes washed in a dishwasher. For washing a full dishwasher load by hand, the participants needed, on average, 60 min, while they only took 9 min on average to load and unload the same amount of dishes in a dishwasher. The average participants were able to fill almost the full load into the dishwasher (96% of the items as used in a test following EN 50242).     

Effects of socio‐demographic factors on laundry behaviours in Europe and their implications on sustainability

The continuing rise of greenhouse gas (GHG) emissions is leading to catastrophic damage in many parts of the world over the coming decades unless GHG emissions can be controlled quickly. The objective of reducing GHG emissions can only be accomplished when all the sectors contributing to GHG emission act responsibly. The contribution of the household to GHG emission was 19.6% in the European Union (EU) in 2013. The energy consumption for laundry washing in the EU, estimated at 24.2 TWh/year, is a substantial share of household energy use. As the use phase of the washing machine is the dominant stage where the environmental impact occurs, this paper addresses some of the EU consumers’ washing and drying behaviour in the laundry process. Information on consumers’ behaviour regarding the laundry process was collected by a semi‐representative survey in eleven EU countries in 2015, including more than 5,000 participants. The main outcome of the study is that consumers’ behaviour regarding the laundry process differs substantially between the EU countries. Moreover, socio‐demographic characteristics of households affect the overall sustainability profile of the laundry process.     

Load profiles and flexibility in operation of washing machines and dishwashers in Europe

While the energy generation system is changing towards the use of more renewable energies, the problem of how to deal with fluctuating energy supply is increasing. Smart appliances in households are often referenced as one possible solution, as their operation may be shifted in time and, thus, used to balance an unstable energy supply. The potential of such appliances has been studied to date mainly in pilot installations with a very limited number of participants or by making assumptions on what might be possible. With this work, a semi‐representative approach for 12 European countries was used to assess actual consumer habits for the use of washing machines and dishwashers which then could be used to calculate average load profiles for those appliances depending on the time of the day. Using these profiles, it is strait forward to calculate how much load may be shifted by those appliances in a demand response application. This allows aggregators or energy utilities to assign clear financial benefits to the shifting potential of those appliances. Consumers use the shifting of appliance operation already today for various reasons. Investigating these reasons allows to learn already a lot about the flexibility of consumers.     

A survey of commercial laundry detergents — how effective are they? Part II: liquids

The effectiveness of 11 unbuilt liquid detergents and eight built liquid detergents, of varying formulations, in cleaning a standard soiled fabric in soft water (5 ppm) were evaluated. It was found that in soft water there were no significant differences between washing in warm or hot water with either type of detergent, except for a melaleuca oil based detergent which was significantly better in hot water. However, although not significant, in general, washing with unbuilt liquid detergents did give somewhat better results in both warm and hot water.     

家用洗衣机能效标准探讨

对比分析了垂直轴洗衣机和水平轴洗衣机的洗衣性能和节能节水性能,讨论了美国、欧洲和中国的洗衣机性能和能效标准,并提出了相应的标准优化建议。     

Comparative study of phosphate and non-phosphate detergents

A comparison of three different detergents was made by evaluating their properties of soil removal, soil redeposition and calcium carbonate deposition. The detergents included a phosphate granular detergent, a non-phosphate, carbonate built granular detergent and an unbuilt liquid detergent. The local water conditions were moderately hard and clay type soils were used. Detergency was evaluated on the basis of both visual and instrumental colour changes. In effecting soil removal, clay stained fabrics laundered with the phosphate detergent retained only a small amount of soil, while fabrics laundered with the two non-phosphate detergents showed heavier staining. In preventing soil redeposition, the phosphate detergent produced almost no visible redeposition; the unbuilt and carbonate built detergents ranked correspondingly lower. In assessing calcium carbonate deposition, the phosphate and unbuilt detergents showed little or no change, while the carbonate detergent continued to build up deposits with laundering. In summary, the phosphate detergent ranked highest in overall performance, with correspondingly lesser performance from the unbuilt and carbonate detergents.     

Changing laundry habits in Norway

Maintenance is often the most energy‐demanding stage during clothes' life cycle. Therefore, a shift towards more sustainable washing habits has great potential to reduce the consumption of energy, water and detergent. This paper discusses the change in laundering practices during the past 10 years in Norway and suggests strategies to help consumers change their laundry habits to more sustainable ones. Quantitative information of consumers' experiences, habits and opinions concerning clothing maintenance was collected through three surveys in Norway in 2002, 2010 and 2011. The 2010 study was supplemented with qualitative in‐depth interviews of a strategic sample of households. The average washing temperature has decreased slightly during the studied time periods. Some products' washing frequencies remained the same, whereas other products such as jeans were used a few more days before washing. The cotton programme is the most used washing programme, but short programmes are gaining popularity. The laundry sorting processes vary greatly and are influenced by several factors such as washing temperature, colours, fibre type and use area. For some consumers, the use of several different sorting categories made it more difficult to collect a sufficient amount of clothing to fill the machine. They were also afraid that overfilling the machine would result in clothes that were not clean enough or had detergent residues. Detergent dosing practices are far from optimal. In 2010, although the majority of respondents only used eye measure and did not know the water hardness of their area, they still tried to vary detergent dosage based on the amount of laundry and the level of soiling. Different design for sustainable behaviour strategies could be used within detergent dosage systems, care labelling, machine programme selection (such as suggesting lower temperature and eco‐programme), machine filling grade indicators, storage systems for slightly used clothing and textile material choice.     

Comparative analysis of global consumer behaviour in the context of different manual dishwashing methods

This laboratory study presents an overview of the global manual dishwashing behaviour. The focus of the investigation was to analyse individual attitudes towards manual dishwashing and to determine the amount of water and energy used, as well as the cleaning performance achieved. Additionally, manual dishwashing was compared with automatic dishwashers. Two hundred eighty-nine participants from 29 countries took part in this investigation. Each consumer had to wash up a complete soiled dishwasher load consisting of 12 place settings based on both international and local performance test standards for automatic dishwashers. Country-specific aspects such as tableware, food residues or washing up equipment were considered. In order to analyse individual consumer's behaviour, each participant was recorded on video and had to fill out a questionnaire. The resource consumption for washing up dishes was measured during the tests. At the end of each trial, the cleaning result of the washed up tableware was assessed. To compare manual with automatic dishwashing, country-specific dishwasher models were tested in parallel with three different programmes with the same soiled dish samples. The study provides comprehensive data about the average resource consumption for manual dishwashing for a specific load for each country. The average water consumption per country reached 34.7 l up to 160.1 l, and individual values ranged from 18.3 l to 472.8 l. The lowest used average heat quantity accounted for 0.9 kWh per country, while the highest amount was five times higher. The cleaning results did not differ much between the countries: the average test results were between 2.2 and 2.8 on a scale between 0 and 5. The automatic dishwasher tests showed differences between both the machines and the programmes. All machines achieved lower water consumption values than the average consumers with about 9.6 l to 26.7 l of water on average. The energy consumption ranged from 0.5 kWh on average up to 2.0 kWh. The cleaning results of the dishwasher tests varied highly ranging from 1.1 in a quick programme to 4.4 in an intensive programme. The study comes to the conclusion that automatic dishwashing is more superior as compared with manual dishwashing in terms of performance and resource consumption under the tested conditions. Furthermore, it points out that washing up dishes under running tap water is the most water-consuming manual dishwashing method of all investigated ones. A high lack of knowledge about the benefits of automatic dishwashing compared with manual dishwashing can still be identified among consumers.